drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 #define ECKD_C0(i) (i->home_bytes)
  46 #define ECKD_F(i) (i->formula)
  47 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  48                     (i->factors.f_0x02.f1))
  49 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  50                     (i->factors.f_0x02.f2))
  51 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  52                     (i->factors.f_0x02.f3))
  53 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  54 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  55 #define ECKD_F6(i) (i->factor6)
  56 #define ECKD_F7(i) (i->factor7)
  57 #define ECKD_F8(i) (i->factor8)
  58
  59 /*
  60  * raw track access always map to 64k in memory
  61  * so it maps to 16 blocks of 4k per track
  62  */
  63 #define DASD_RAW_BLOCK_PER_TRACK 16
  64 #define DASD_RAW_BLOCKSIZE 4096
  65 /* 64k are 128 x 512 byte sectors  */
  66 #define DASD_RAW_SECTORS_PER_TRACK 128
  67
  68 MODULE_LICENSE("GPL");
  69
  70 static struct dasd_discipline dasd_eckd_discipline;
  71
  72 /* The ccw bus type uses this table to find devices that it sends to
  73  * dasd_eckd_probe */
  74 static struct ccw_device_id dasd_eckd_ids[] = {
  75         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  76         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  77         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  78         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  79         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  80         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  81         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  82         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  83         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  84         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  85         { /* end of list */ },
  86 };
  87
  88 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  89
  90 static struct ccw_driver dasd_eckd_driver; /* see below */
  91
  92 static void *rawpadpage;
  93
  94 #define INIT_CQR_OK 0
  95 #define INIT_CQR_UNFORMATTED 1
  96 #define INIT_CQR_ERROR 2
  97
  98 /* emergency request for reserve/release */
  99 static struct {
 100         struct dasd_ccw_req cqr;
 101         struct ccw1 ccw;
 102         char data[32];
 103 } *dasd_reserve_req;
 104 static DEFINE_MUTEX(dasd_reserve_mutex);
 105
 106 /* definitions for the path verification worker */
 107 struct path_verification_work_data {
 108         struct work_struct worker;
 109         struct dasd_device *device;
 110         struct dasd_ccw_req cqr;
 111         struct ccw1 ccw;
 112         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 113         int isglobal;
 114         __u8 tbvpm;
 115 };
 116 static struct path_verification_work_data *path_verification_worker;
 117 static DEFINE_MUTEX(dasd_path_verification_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 126                         struct dasd_device *, struct dasd_device *,
 127                         unsigned int, int, unsigned int, unsigned int,
 128                         unsigned int, unsigned int);
 129
 130 /* initial attempt at a probe function. this can be simplified once
 131  * the other detection code is gone */
 132 static int
 133 dasd_eckd_probe (struct ccw_device *cdev)
 134 {
 135         int ret;
 136
 137         /* set ECKD specific ccw-device options */
 138         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 139                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 140         if (ret) {
 141                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 142                                 "dasd_eckd_probe: could not set "
 143                                 "ccw-device options");
 144                 return ret;
 145         }
 146         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 147         return ret;
 148 }
 149
 150 static int
 151 dasd_eckd_set_online(struct ccw_device *cdev)
 152 {
 153         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 154 }
 155
 156 static const int sizes_trk0[] = { 28, 148, 84 };
 157 #define LABEL_SIZE 140
 158
 159 /* head and record addresses of count_area read in analysis ccw */
 160 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 162
 163 static inline unsigned int
 164 round_up_multiple(unsigned int no, unsigned int mult)
 165 {
 166         int rem = no % mult;
 167         return (rem ? no - rem + mult : no);
 168 }
 169
 170 static inline unsigned int
 171 ceil_quot(unsigned int d1, unsigned int d2)
 172 {
 173         return (d1 + (d2 - 1)) / d2;
 174 }
 175
 176 static unsigned int
 177 recs_per_track(struct dasd_eckd_characteristics * rdc,
 178                unsigned int kl, unsigned int dl)
 179 {
 180         int dn, kn;
 181
 182         switch (rdc->dev_type) {
 183         case 0x3380:
 184                 if (kl)
 185                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 186                                        ceil_quot(dl + 12, 32));
 187                 else
 188                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 189         case 0x3390:
 190                 dn = ceil_quot(dl + 6, 232) + 1;
 191                 if (kl) {
 192                         kn = ceil_quot(kl + 6, 232) + 1;
 193                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 194                                        9 + ceil_quot(dl + 6 * dn, 34));
 195                 } else
 196                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 197         case 0x9345:
 198                 dn = ceil_quot(dl + 6, 232) + 1;
 199                 if (kl) {
 200                         kn = ceil_quot(kl + 6, 232) + 1;
 201                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 202                                        ceil_quot(dl + 6 * dn, 34));
 203                 } else
 204                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 205         }
 206         return 0;
 207 }
 208
 209 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 210 {
 211         geo->cyl = (__u16) cyl;
 212         geo->head = cyl >> 16;
 213         geo->head <<= 4;
 214         geo->head |= head;
 215 }
 216
 217 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 218                      struct dasd_device *device)
 219 {
 220         struct dasd_eckd_private *private = device->private;
 221         int rc;
 222
 223         rc = get_phys_clock(&data->ep_sys_time);
 224         /*
 225          * Ignore return code if XRC is not supported or
 226          * sync clock is switched off
 227          */
 228         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 229             rc == -EOPNOTSUPP || rc == -EACCES)
 230                 return 0;
 231
 232         /* switch on System Time Stamp - needed for XRC Support */
 233         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 234         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 235
 236         if (ccw) {
 237                 ccw->count = sizeof(struct DE_eckd_data);
 238                 ccw->flags |= CCW_FLAG_SLI;
 239         }
 240
 241         return rc;
 242 }
 243
 244 static int
 245 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 246               unsigned int totrk, int cmd, struct dasd_device *device,
 247               int blksize)
 248 {
 249         struct dasd_eckd_private *private = device->private;
 250         u16 heads, beghead, endhead;
 251         u32 begcyl, endcyl;
 252         int rc = 0;
 253
 254         if (ccw) {
 255                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 256                 ccw->flags = 0;
 257                 ccw->count = 16;
 258                 ccw->cda = (__u32)__pa(data);
 259         }
 260
 261         memset(data, 0, sizeof(struct DE_eckd_data));
 262         switch (cmd) {
 263         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 264         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 265         case DASD_ECKD_CCW_READ:
 266         case DASD_ECKD_CCW_READ_MT:
 267         case DASD_ECKD_CCW_READ_CKD:
 268         case DASD_ECKD_CCW_READ_CKD_MT:
 269         case DASD_ECKD_CCW_READ_KD:
 270         case DASD_ECKD_CCW_READ_KD_MT:
 271                 data->mask.perm = 0x1;
 272                 data->attributes.operation = private->attrib.operation;
 273                 break;
 274         case DASD_ECKD_CCW_READ_COUNT:
 275                 data->mask.perm = 0x1;
 276                 data->attributes.operation = DASD_BYPASS_CACHE;
 277                 break;
 278         case DASD_ECKD_CCW_READ_TRACK:
 279         case DASD_ECKD_CCW_READ_TRACK_DATA:
 280                 data->mask.perm = 0x1;
 281                 data->attributes.operation = private->attrib.operation;
 282                 data->blk_size = 0;
 283                 break;
 284         case DASD_ECKD_CCW_WRITE:
 285         case DASD_ECKD_CCW_WRITE_MT:
 286         case DASD_ECKD_CCW_WRITE_KD:
 287         case DASD_ECKD_CCW_WRITE_KD_MT:
 288                 data->mask.perm = 0x02;
 289                 data->attributes.operation = private->attrib.operation;
 290                 rc = set_timestamp(ccw, data, device);
 291                 break;
 292         case DASD_ECKD_CCW_WRITE_CKD:
 293         case DASD_ECKD_CCW_WRITE_CKD_MT:
 294                 data->attributes.operation = DASD_BYPASS_CACHE;
 295                 rc = set_timestamp(ccw, data, device);
 296                 break;
 297         case DASD_ECKD_CCW_ERASE:
 298         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 299         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 300                 data->mask.perm = 0x3;
 301                 data->mask.auth = 0x1;
 302                 data->attributes.operation = DASD_BYPASS_CACHE;
 303                 rc = set_timestamp(ccw, data, device);
 304                 break;
 305         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 306                 data->mask.perm = 0x03;
 307                 data->attributes.operation = private->attrib.operation;
 308                 data->blk_size = 0;
 309                 break;
 310         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 311                 data->mask.perm = 0x02;
 312                 data->attributes.operation = private->attrib.operation;
 313                 data->blk_size = blksize;
 314                 rc = set_timestamp(ccw, data, device);
 315                 break;
 316         default:
 317                 dev_err(&device->cdev->dev,
 318                         "0x%x is not a known command\n", cmd);
 319                 break;
 320         }
 321
 322         data->attributes.mode = 0x3;    /* ECKD */
 323
 324         if ((private->rdc_data.cu_type == 0x2105 ||
 325              private->rdc_data.cu_type == 0x2107 ||
 326              private->rdc_data.cu_type == 0x1750)
 327             && !(private->uses_cdl && trk < 2))
 328                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 329
 330         heads = private->rdc_data.trk_per_cyl;
 331         begcyl = trk / heads;
 332         beghead = trk % heads;
 333         endcyl = totrk / heads;
 334         endhead = totrk % heads;
 335
 336         /* check for sequential prestage - enhance cylinder range */
 337         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 338             data->attributes.operation == DASD_SEQ_ACCESS) {
 339
 340                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 341                         endcyl += private->attrib.nr_cyl;
 342                 else
 343                         endcyl = (private->real_cyl - 1);
 344         }
 345
 346         set_ch_t(&data->beg_ext, begcyl, beghead);
 347         set_ch_t(&data->end_ext, endcyl, endhead);
 348         return rc;
 349 }
 350
 351
 352 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 353                               unsigned int trk, unsigned int rec_on_trk,
 354                               int count, int cmd, struct dasd_device *device,
 355                               unsigned int reclen, unsigned int tlf)
 356 {
 357         struct dasd_eckd_private *private = device->private;
 358         int sector;
 359         int dn, d;
 360
 361         if (ccw) {
 362                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 363                 ccw->flags = 0;
 364                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 365                         ccw->count = 22;
 366                 else
 367                         ccw->count = 20;
 368                 ccw->cda = (__u32)__pa(data);
 369         }
 370
 371         memset(data, 0, sizeof(*data));
 372         sector = 0;
 373         if (rec_on_trk) {
 374                 switch (private->rdc_data.dev_type) {
 375                 case 0x3390:
 376                         dn = ceil_quot(reclen + 6, 232);
 377                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 378                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 379                         break;
 380                 case 0x3380:
 381                         d = 7 + ceil_quot(reclen + 12, 32);
 382                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 383                         break;
 384                 }
 385         }
 386         data->sector = sector;
 387         /* note: meaning of count depends on the operation
 388          *       for record based I/O it's the number of records, but for
 389          *       track based I/O it's the number of tracks
 390          */
 391         data->count = count;
 392         switch (cmd) {
 393         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 394                 data->operation.orientation = 0x3;
 395                 data->operation.operation = 0x03;
 396                 break;
 397         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 398                 data->operation.orientation = 0x3;
 399                 data->operation.operation = 0x16;
 400                 break;
 401         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 402                 data->operation.orientation = 0x1;
 403                 data->operation.operation = 0x03;
 404                 data->count++;
 405                 break;
 406         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 407                 data->operation.orientation = 0x3;
 408                 data->operation.operation = 0x16;
 409                 data->count++;
 410                 break;
 411         case DASD_ECKD_CCW_WRITE:
 412         case DASD_ECKD_CCW_WRITE_MT:
 413         case DASD_ECKD_CCW_WRITE_KD:
 414         case DASD_ECKD_CCW_WRITE_KD_MT:
 415                 data->auxiliary.length_valid = 0x1;
 416                 data->length = reclen;
 417                 data->operation.operation = 0x01;
 418                 break;
 419         case DASD_ECKD_CCW_WRITE_CKD:
 420         case DASD_ECKD_CCW_WRITE_CKD_MT:
 421                 data->auxiliary.length_valid = 0x1;
 422                 data->length = reclen;
 423                 data->operation.operation = 0x03;
 424                 break;
 425         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 426                 data->operation.orientation = 0x0;
 427                 data->operation.operation = 0x3F;
 428                 data->extended_operation = 0x11;
 429                 data->length = 0;
 430                 data->extended_parameter_length = 0x02;
 431                 if (data->count > 8) {
 432                         data->extended_parameter[0] = 0xFF;
 433                         data->extended_parameter[1] = 0xFF;
 434                         data->extended_parameter[1] <<= (16 - count);
 435                 } else {
 436                         data->extended_parameter[0] = 0xFF;
 437                         data->extended_parameter[0] <<= (8 - count);
 438                         data->extended_parameter[1] = 0x00;
 439                 }
 440                 data->sector = 0xFF;
 441                 break;
 442         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 443                 data->auxiliary.length_valid = 0x1;
 444                 data->length = reclen;  /* not tlf, as one might think */
 445                 data->operation.operation = 0x3F;
 446                 data->extended_operation = 0x23;
 447                 break;
 448         case DASD_ECKD_CCW_READ:
 449         case DASD_ECKD_CCW_READ_MT:
 450         case DASD_ECKD_CCW_READ_KD:
 451         case DASD_ECKD_CCW_READ_KD_MT:
 452                 data->auxiliary.length_valid = 0x1;
 453                 data->length = reclen;
 454                 data->operation.operation = 0x06;
 455                 break;
 456         case DASD_ECKD_CCW_READ_CKD:
 457         case DASD_ECKD_CCW_READ_CKD_MT:
 458                 data->auxiliary.length_valid = 0x1;
 459                 data->length = reclen;
 460                 data->operation.operation = 0x16;
 461                 break;
 462         case DASD_ECKD_CCW_READ_COUNT:
 463                 data->operation.operation = 0x06;
 464                 break;
 465         case DASD_ECKD_CCW_READ_TRACK:
 466                 data->operation.orientation = 0x1;
 467                 data->operation.operation = 0x0C;
 468                 data->extended_parameter_length = 0;
 469                 data->sector = 0xFF;
 470                 break;
 471         case DASD_ECKD_CCW_READ_TRACK_DATA:
 472                 data->auxiliary.length_valid = 0x1;
 473                 data->length = tlf;
 474                 data->operation.operation = 0x0C;
 475                 break;
 476         case DASD_ECKD_CCW_ERASE:
 477                 data->length = reclen;
 478                 data->auxiliary.length_valid = 0x1;
 479                 data->operation.operation = 0x0b;
 480                 break;
 481         default:
 482                 DBF_DEV_EVENT(DBF_ERR, device,
 483                             "fill LRE unknown opcode 0x%x", cmd);
 484                 BUG();
 485         }
 486         set_ch_t(&data->seek_addr,
 487                  trk / private->rdc_data.trk_per_cyl,
 488                  trk % private->rdc_data.trk_per_cyl);
 489         data->search_arg.cyl = data->seek_addr.cyl;
 490         data->search_arg.head = data->seek_addr.head;
 491         data->search_arg.record = rec_on_trk;
 492 }
 493
 494 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 495                       unsigned int trk, unsigned int totrk, int cmd,
 496                       struct dasd_device *basedev, struct dasd_device *startdev,
 497                       unsigned int format, unsigned int rec_on_trk, int count,
 498                       unsigned int blksize, unsigned int tlf)
 499 {
 500         struct dasd_eckd_private *basepriv, *startpriv;
 501         struct LRE_eckd_data *lredata;
 502         struct DE_eckd_data *dedata;
 503         int rc = 0;
 504
 505         basepriv = basedev->private;
 506         startpriv = startdev->private;
 507         dedata = &pfxdata->define_extent;
 508         lredata = &pfxdata->locate_record;
 509
 510         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 511         ccw->flags = 0;
 512         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 513                 ccw->count = sizeof(*pfxdata) + 2;
 514                 ccw->cda = (__u32) __pa(pfxdata);
 515                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 516         } else {
 517                 ccw->count = sizeof(*pfxdata);
 518                 ccw->cda = (__u32) __pa(pfxdata);
 519                 memset(pfxdata, 0, sizeof(*pfxdata));
 520         }
 521
 522         /* prefix data */
 523         if (format > 1) {
 524                 DBF_DEV_EVENT(DBF_ERR, basedev,
 525                               "PFX LRE unknown format 0x%x", format);
 526                 BUG();
 527                 return -EINVAL;
 528         }
 529         pfxdata->format = format;
 530         pfxdata->base_address = basepriv->ned->unit_addr;
 531         pfxdata->base_lss = basepriv->ned->ID;
 532         pfxdata->validity.define_extent = 1;
 533
 534         /* private uid is kept up to date, conf_data may be outdated */
 535         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 536                 pfxdata->validity.verify_base = 1;
 537
 538         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 539                 pfxdata->validity.verify_base = 1;
 540                 pfxdata->validity.hyper_pav = 1;
 541         }
 542
 543         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 544
 545         /*
 546          * For some commands the System Time Stamp is set in the define extent
 547          * data when XRC is supported. The validity of the time stamp must be
 548          * reflected in the prefix data as well.
 549          */
 550         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 551                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 552
 553         if (format == 1) {
 554                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 555                                   basedev, blksize, tlf);
 556         }
 557
 558         return rc;
 559 }
 560
 561 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 562                   unsigned int trk, unsigned int totrk, int cmd,
 563                   struct dasd_device *basedev, struct dasd_device *startdev)
 564 {
 565         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 566                           0, 0, 0, 0, 0);
 567 }
 568
 569 static void
 570 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 571               unsigned int rec_on_trk, int no_rec, int cmd,
 572               struct dasd_device * device, int reclen)
 573 {
 574         struct dasd_eckd_private *private = device->private;
 575         int sector;
 576         int dn, d;
 577
 578         DBF_DEV_EVENT(DBF_INFO, device,
 579                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 580                   trk, rec_on_trk, no_rec, cmd, reclen);
 581
 582         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 583         ccw->flags = 0;
 584         ccw->count = 16;
 585         ccw->cda = (__u32) __pa(data);
 586
 587         memset(data, 0, sizeof(struct LO_eckd_data));
 588         sector = 0;
 589         if (rec_on_trk) {
 590                 switch (private->rdc_data.dev_type) {
 591                 case 0x3390:
 592                         dn = ceil_quot(reclen + 6, 232);
 593                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 594                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 595                         break;
 596                 case 0x3380:
 597                         d = 7 + ceil_quot(reclen + 12, 32);
 598                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 599                         break;
 600                 }
 601         }
 602         data->sector = sector;
 603         data->count = no_rec;
 604         switch (cmd) {
 605         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 606                 data->operation.orientation = 0x3;
 607                 data->operation.operation = 0x03;
 608                 break;
 609         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 610                 data->operation.orientation = 0x3;
 611                 data->operation.operation = 0x16;
 612                 break;
 613         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 614                 data->operation.orientation = 0x1;
 615                 data->operation.operation = 0x03;
 616                 data->count++;
 617                 break;
 618         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 619                 data->operation.orientation = 0x3;
 620                 data->operation.operation = 0x16;
 621                 data->count++;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE:
 624         case DASD_ECKD_CCW_WRITE_MT:
 625         case DASD_ECKD_CCW_WRITE_KD:
 626         case DASD_ECKD_CCW_WRITE_KD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x01;
 630                 break;
 631         case DASD_ECKD_CCW_WRITE_CKD:
 632         case DASD_ECKD_CCW_WRITE_CKD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x03;
 636                 break;
 637         case DASD_ECKD_CCW_READ:
 638         case DASD_ECKD_CCW_READ_MT:
 639         case DASD_ECKD_CCW_READ_KD:
 640         case DASD_ECKD_CCW_READ_KD_MT:
 641                 data->auxiliary.last_bytes_used = 0x1;
 642                 data->length = reclen;
 643                 data->operation.operation = 0x06;
 644                 break;
 645         case DASD_ECKD_CCW_READ_CKD:
 646         case DASD_ECKD_CCW_READ_CKD_MT:
 647                 data->auxiliary.last_bytes_used = 0x1;
 648                 data->length = reclen;
 649                 data->operation.operation = 0x16;
 650                 break;
 651         case DASD_ECKD_CCW_READ_COUNT:
 652                 data->operation.operation = 0x06;
 653                 break;
 654         case DASD_ECKD_CCW_ERASE:
 655                 data->length = reclen;
 656                 data->auxiliary.last_bytes_used = 0x1;
 657                 data->operation.operation = 0x0b;
 658                 break;
 659         default:
 660                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 661                               "opcode 0x%x", cmd);
 662         }
 663         set_ch_t(&data->seek_addr,
 664                  trk / private->rdc_data.trk_per_cyl,
 665                  trk % private->rdc_data.trk_per_cyl);
 666         data->search_arg.cyl = data->seek_addr.cyl;
 667         data->search_arg.head = data->seek_addr.head;
 668         data->search_arg.record = rec_on_trk;
 669 }
 670
 671 /*
 672  * Returns 1 if the block is one of the special blocks that needs
 673  * to get read/written with the KD variant of the command.
 674  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 675  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 676  * Luckily the KD variants differ only by one bit (0x08) from the
 677  * normal variant. So don't wonder about code like:
 678  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 679  *         ccw->cmd_code |= 0x8;
 680  */
 681 static inline int
 682 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 683 {
 684         if (recid < 3)
 685                 return 1;
 686         if (recid < blk_per_trk)
 687                 return 0;
 688         if (recid < 2 * blk_per_trk)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 /*
 694  * Returns the record size for the special blocks of the cdl format.
 695  * Only returns something useful if dasd_eckd_cdl_special is true
 696  * for the recid.
 697  */
 698 static inline int
 699 dasd_eckd_cdl_reclen(int recid)
 700 {
 701         if (recid < 3)
 702                 return sizes_trk0[recid];
 703         return LABEL_SIZE;
 704 }
 705 /* create unique id from private structure. */
 706 static void create_uid(struct dasd_eckd_private *private)
 707 {
 708         int count;
 709         struct dasd_uid *uid;
 710
 711         uid = &private->uid;
 712         memset(uid, 0, sizeof(struct dasd_uid));
 713         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 714                sizeof(uid->vendor) - 1);
 715         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 716         memcpy(uid->serial, private->ned->HDA_location,
 717                sizeof(uid->serial) - 1);
 718         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 719         uid->ssid = private->gneq->subsystemID;
 720         uid->real_unit_addr = private->ned->unit_addr;
 721         if (private->sneq) {
 722                 uid->type = private->sneq->sua_flags;
 723                 if (uid->type == UA_BASE_PAV_ALIAS)
 724                         uid->base_unit_addr = private->sneq->base_unit_addr;
 725         } else {
 726                 uid->type = UA_BASE_DEVICE;
 727         }
 728         if (private->vdsneq) {
 729                 for (count = 0; count < 16; count++) {
 730                         sprintf(uid->vduit+2*count, "%02x",
 731                                 private->vdsneq->uit[count]);
 732                 }
 733         }
 734 }
 735
 736 /*
 737  * Generate device unique id that specifies the physical device.
 738  */
 739 static int dasd_eckd_generate_uid(struct dasd_device *device)
 740 {
 741         struct dasd_eckd_private *private = device->private;
 742         unsigned long flags;
 743
 744         if (!private)
 745                 return -ENODEV;
 746         if (!private->ned || !private->gneq)
 747                 return -ENODEV;
 748         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 749         create_uid(private);
 750         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 751         return 0;
 752 }
 753
 754 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 755 {
 756         struct dasd_eckd_private *private = device->private;
 757         unsigned long flags;
 758
 759         if (private) {
 760                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 761                 *uid = private->uid;
 762                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 763                 return 0;
 764         }
 765         return -EINVAL;
 766 }
 767
 768 /*
 769  * compare device UID with data of a given dasd_eckd_private structure
 770  * return 0 for match
 771  */
 772 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 773                                       struct dasd_eckd_private *private)
 774 {
 775         struct dasd_uid device_uid;
 776
 777         create_uid(private);
 778         dasd_eckd_get_uid(device, &device_uid);
 779
 780         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 781 }
 782
 783 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 784                                    struct dasd_ccw_req *cqr,
 785                                    __u8 *rcd_buffer,
 786                                    __u8 lpm)
 787 {
 788         struct ccw1 *ccw;
 789         /*
 790          * buffer has to start with EBCDIC "V1.0" to show
 791          * support for virtual device SNEQ
 792          */
 793         rcd_buffer[0] = 0xE5;
 794         rcd_buffer[1] = 0xF1;
 795         rcd_buffer[2] = 0x4B;
 796         rcd_buffer[3] = 0xF0;
 797
 798         ccw = cqr->cpaddr;
 799         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 800         ccw->flags = 0;
 801         ccw->cda = (__u32)(addr_t)rcd_buffer;
 802         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 803         cqr->magic = DASD_ECKD_MAGIC;
 804
 805         cqr->startdev = device;
 806         cqr->memdev = device;
 807         cqr->block = NULL;
 808         cqr->expires = 10*HZ;
 809         cqr->lpm = lpm;
 810         cqr->retries = 256;
 811         cqr->buildclk = get_tod_clock();
 812         cqr->status = DASD_CQR_FILLED;
 813         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 814 }
 815
 816 /*
 817  * Wakeup helper for read_conf
 818  * if the cqr is not done and needs some error recovery
 819  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 820  * to show support for virtual device SNEQ
 821  */
 822 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 823 {
 824         struct ccw1 *ccw;
 825         __u8 *rcd_buffer;
 826
 827         if (cqr->status !=  DASD_CQR_DONE) {
 828                 ccw = cqr->cpaddr;
 829                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 830                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 831
 832                 rcd_buffer[0] = 0xE5;
 833                 rcd_buffer[1] = 0xF1;
 834                 rcd_buffer[2] = 0x4B;
 835                 rcd_buffer[3] = 0xF0;
 836         }
 837         dasd_wakeup_cb(cqr, data);
 838 }
 839
 840 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 841                                            struct dasd_ccw_req *cqr,
 842                                            __u8 *rcd_buffer,
 843                                            __u8 lpm)
 844 {
 845         struct ciw *ciw;
 846         int rc;
 847         /*
 848          * sanity check: scan for RCD command in extended SenseID data
 849          * some devices do not support RCD
 850          */
 851         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 852         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 853                 return -EOPNOTSUPP;
 854
 855         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 856         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 857         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 858         cqr->retries = 5;
 859         cqr->callback = read_conf_cb;
 860         rc = dasd_sleep_on_immediatly(cqr);
 861         return rc;
 862 }
 863
 864 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 865                                    void **rcd_buffer,
 866                                    int *rcd_buffer_size, __u8 lpm)
 867 {
 868         struct ciw *ciw;
 869         char *rcd_buf = NULL;
 870         int ret;
 871         struct dasd_ccw_req *cqr;
 872
 873         /*
 874          * sanity check: scan for RCD command in extended SenseID data
 875          * some devices do not support RCD
 876          */
 877         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 878         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 879                 ret = -EOPNOTSUPP;
 880                 goto out_error;
 881         }
 882         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 883         if (!rcd_buf) {
 884                 ret = -ENOMEM;
 885                 goto out_error;
 886         }
 887         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 888                                    0, /* use rcd_buf as data ara */
 889                                    device, NULL);
 890         if (IS_ERR(cqr)) {
 891                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 892                               "Could not allocate RCD request");
 893                 ret = -ENOMEM;
 894                 goto out_error;
 895         }
 896         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 897         cqr->callback = read_conf_cb;
 898         ret = dasd_sleep_on(cqr);
 899         /*
 900          * on success we update the user input parms
 901          */
 902         dasd_sfree_request(cqr, cqr->memdev);
 903         if (ret)
 904                 goto out_error;
 905
 906         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 907         *rcd_buffer = rcd_buf;
 908         return 0;
 909 out_error:
 910         kfree(rcd_buf);
 911         *rcd_buffer = NULL;
 912         *rcd_buffer_size = 0;
 913         return ret;
 914 }
 915
 916 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 917 {
 918
 919         struct dasd_sneq *sneq;
 920         int i, count;
 921
 922         private->ned = NULL;
 923         private->sneq = NULL;
 924         private->vdsneq = NULL;
 925         private->gneq = NULL;
 926         count = private->conf_len / sizeof(struct dasd_sneq);
 927         sneq = (struct dasd_sneq *)private->conf_data;
 928         for (i = 0; i < count; ++i) {
 929                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 930                         private->sneq = sneq;
 931                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 932                         private->vdsneq = (struct vd_sneq *)sneq;
 933                 else if (sneq->flags.identifier == 2)
 934                         private->gneq = (struct dasd_gneq *)sneq;
 935                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 936                         private->ned = (struct dasd_ned *)sneq;
 937                 sneq++;
 938         }
 939         if (!private->ned || !private->gneq) {
 940                 private->ned = NULL;
 941                 private->sneq = NULL;
 942                 private->vdsneq = NULL;
 943                 private->gneq = NULL;
 944                 return -EINVAL;
 945         }
 946         return 0;
 947
 948 };
 949
 950 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 951 {
 952         struct dasd_gneq *gneq;
 953         int i, count, found;
 954
 955         count = conf_len / sizeof(*gneq);
 956         gneq = (struct dasd_gneq *)conf_data;
 957         found = 0;
 958         for (i = 0; i < count; ++i) {
 959                 if (gneq->flags.identifier == 2) {
 960                         found = 1;
 961                         break;
 962                 }
 963                 gneq++;
 964         }
 965         if (found)
 966                 return ((char *)gneq)[18] & 0x07;
 967         else
 968                 return 0;
 969 }
 970
 971 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
 972 {
 973         struct dasd_eckd_private *private = device->private;
 974         int i;
 975
 976         private->conf_data = NULL;
 977         private->conf_len = 0;
 978         for (i = 0; i < 8; i++) {
 979                 kfree(device->path[i].conf_data);
 980                 device->path[i].conf_data = NULL;
 981                 device->path[i].cssid = 0;
 982                 device->path[i].ssid = 0;
 983                 device->path[i].chpid = 0;
 984         }
 985 }
 986
 987
 988 static int dasd_eckd_read_conf(struct dasd_device *device)
 989 {
 990         void *conf_data;
 991         int conf_len, conf_data_saved;
 992         int rc, path_err, pos;
 993         __u8 lpm, opm;
 994         struct dasd_eckd_private *private, path_private;
 995         struct dasd_uid *uid;
 996         char print_path_uid[60], print_device_uid[60];
 997         struct channel_path_desc_fmt0 *chp_desc;
 998         struct subchannel_id sch_id;
 999
1000         private = device->private;
1001         opm = ccw_device_get_path_mask(device->cdev);
1002         ccw_device_get_schid(device->cdev, &sch_id);
1003         conf_data_saved = 0;
1004         path_err = 0;
1005         /* get configuration data per operational path */
1006         for (lpm = 0x80; lpm; lpm>>= 1) {
1007                 if (!(lpm & opm))
1008                         continue;
1009                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1010                                              &conf_len, lpm);
1011                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1012                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1013                                         "Read configuration data returned "
1014                                         "error %d", rc);
1015                         return rc;
1016                 }
1017                 if (conf_data == NULL) {
1018                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1019                                         "No configuration data "
1020                                         "retrieved");
1021                         /* no further analysis possible */
1022                         dasd_path_add_opm(device, opm);
1023                         continue;       /* no error */
1024                 }
1025                 /* save first valid configuration data */
1026                 if (!conf_data_saved) {
1027                         /* initially clear previously stored conf_data */
1028                         dasd_eckd_clear_conf_data(device);
1029                         private->conf_data = conf_data;
1030                         private->conf_len = conf_len;
1031                         if (dasd_eckd_identify_conf_parts(private)) {
1032                                 private->conf_data = NULL;
1033                                 private->conf_len = 0;
1034                                 kfree(conf_data);
1035                                 continue;
1036                         }
1037                         pos = pathmask_to_pos(lpm);
1038                         /* store per path conf_data */
1039                         device->path[pos].conf_data = conf_data;
1040                         device->path[pos].cssid = sch_id.cssid;
1041                         device->path[pos].ssid = sch_id.ssid;
1042                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1043                         if (chp_desc)
1044                                 device->path[pos].chpid = chp_desc->chpid;
1045                         kfree(chp_desc);
1046                         /*
1047                          * build device UID that other path data
1048                          * can be compared to it
1049                          */
1050                         dasd_eckd_generate_uid(device);
1051                         conf_data_saved++;
1052                 } else {
1053                         path_private.conf_data = conf_data;
1054                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1055                         if (dasd_eckd_identify_conf_parts(
1056                                     &path_private)) {
1057                                 path_private.conf_data = NULL;
1058                                 path_private.conf_len = 0;
1059                                 kfree(conf_data);
1060                                 continue;
1061                         }
1062                         if (dasd_eckd_compare_path_uid(
1063                                     device, &path_private)) {
1064                                 uid = &path_private.uid;
1065                                 if (strlen(uid->vduit) > 0)
1066                                         snprintf(print_path_uid,
1067                                                  sizeof(print_path_uid),
1068                                                  "%s.%s.%04x.%02x.%s",
1069                                                  uid->vendor, uid->serial,
1070                                                  uid->ssid, uid->real_unit_addr,
1071                                                  uid->vduit);
1072                                 else
1073                                         snprintf(print_path_uid,
1074                                                  sizeof(print_path_uid),
1075                                                  "%s.%s.%04x.%02x",
1076                                                  uid->vendor, uid->serial,
1077                                                  uid->ssid,
1078                                                  uid->real_unit_addr);
1079                                 uid = &private->uid;
1080                                 if (strlen(uid->vduit) > 0)
1081                                         snprintf(print_device_uid,
1082                                                  sizeof(print_device_uid),
1083                                                  "%s.%s.%04x.%02x.%s",
1084                                                  uid->vendor, uid->serial,
1085                                                  uid->ssid, uid->real_unit_addr,
1086                                                  uid->vduit);
1087                                 else
1088                                         snprintf(print_device_uid,
1089                                                  sizeof(print_device_uid),
1090                                                  "%s.%s.%04x.%02x",
1091                                                  uid->vendor, uid->serial,
1092                                                  uid->ssid,
1093                                                  uid->real_unit_addr);
1094                                 dev_err(&device->cdev->dev,
1095                                         "Not all channel paths lead to "
1096                                         "the same device, path %02X leads to "
1097                                         "device %s instead of %s\n", lpm,
1098                                         print_path_uid, print_device_uid);
1099                                 path_err = -EINVAL;
1100                                 dasd_path_add_cablepm(device, lpm);
1101                                 continue;
1102                         }
1103                         pos = pathmask_to_pos(lpm);
1104                         /* store per path conf_data */
1105                         device->path[pos].conf_data = conf_data;
1106                         device->path[pos].cssid = sch_id.cssid;
1107                         device->path[pos].ssid = sch_id.ssid;
1108                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1109                         if (chp_desc)
1110                                 device->path[pos].chpid = chp_desc->chpid;
1111                         kfree(chp_desc);
1112                         path_private.conf_data = NULL;
1113                         path_private.conf_len = 0;
1114                 }
1115                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1116                 case 0x02:
1117                         dasd_path_add_nppm(device, lpm);
1118                         break;
1119                 case 0x03:
1120                         dasd_path_add_ppm(device, lpm);
1121                         break;
1122                 }
1123                 if (!dasd_path_get_opm(device)) {
1124                         dasd_path_set_opm(device, lpm);
1125                         dasd_generic_path_operational(device);
1126                 } else {
1127                         dasd_path_add_opm(device, lpm);
1128                 }
1129         }
1130
1131         return path_err;
1132 }
1133
1134 static u32 get_fcx_max_data(struct dasd_device *device)
1135 {
1136         struct dasd_eckd_private *private = device->private;
1137         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1138         unsigned int mdc;
1139         int tpm;
1140
1141         if (dasd_nofcx)
1142                 return 0;
1143         /* is transport mode supported? */
1144         fcx_in_css = css_general_characteristics.fcx;
1145         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1146         fcx_in_features = private->features.feature[40] & 0x80;
1147         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1148
1149         if (!tpm)
1150                 return 0;
1151
1152         mdc = ccw_device_get_mdc(device->cdev, 0);
1153         if (mdc == 0) {
1154                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1155                 return 0;
1156         } else {
1157                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1158         }
1159 }
1160
1161 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1162 {
1163         struct dasd_eckd_private *private = device->private;
1164         unsigned int mdc;
1165         u32 fcx_max_data;
1166
1167         if (private->fcx_max_data) {
1168                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1169                 if (mdc == 0) {
1170                         dev_warn(&device->cdev->dev,
1171                                  "Detecting the maximum data size for zHPF "
1172                                  "requests failed (rc=%d) for a new path %x\n",
1173                                  mdc, lpm);
1174                         return mdc;
1175                 }
1176                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1177                 if (fcx_max_data < private->fcx_max_data) {
1178                         dev_warn(&device->cdev->dev,
1179                                  "The maximum data size for zHPF requests %u "
1180                                  "on a new path %x is below the active maximum "
1181                                  "%u\n", fcx_max_data, lpm,
1182                                  private->fcx_max_data);
1183                         return -EACCES;
1184                 }
1185         }
1186         return 0;
1187 }
1188
1189 static int rebuild_device_uid(struct dasd_device *device,
1190                               struct path_verification_work_data *data)
1191 {
1192         struct dasd_eckd_private *private = device->private;
1193         __u8 lpm, opm = dasd_path_get_opm(device);
1194         int rc = -ENODEV;
1195
1196         for (lpm = 0x80; lpm; lpm >>= 1) {
1197                 if (!(lpm & opm))
1198                         continue;
1199                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1200                 memset(&data->cqr, 0, sizeof(data->cqr));
1201                 data->cqr.cpaddr = &data->ccw;
1202                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1203                                                      data->rcd_buffer,
1204                                                      lpm);
1205
1206                 if (rc) {
1207                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1208                                 continue;
1209                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1210                                         "Read configuration data "
1211                                         "returned error %d", rc);
1212                         break;
1213                 }
1214                 memcpy(private->conf_data, data->rcd_buffer,
1215                        DASD_ECKD_RCD_DATA_SIZE);
1216                 if (dasd_eckd_identify_conf_parts(private)) {
1217                         rc = -ENODEV;
1218                 } else /* first valid path is enough */
1219                         break;
1220         }
1221
1222         if (!rc)
1223                 rc = dasd_eckd_generate_uid(device);
1224
1225         return rc;
1226 }
1227
1228 static void do_path_verification_work(struct work_struct *work)
1229 {
1230         struct path_verification_work_data *data;
1231         struct dasd_device *device;
1232         struct dasd_eckd_private path_private;
1233         struct dasd_uid *uid;
1234         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1235         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1236         unsigned long flags;
1237         char print_uid[60];
1238         int rc;
1239
1240         data = container_of(work, struct path_verification_work_data, worker);
1241         device = data->device;
1242
1243         /* delay path verification until device was resumed */
1244         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1245                 schedule_work(work);
1246                 return;
1247         }
1248         /* check if path verification already running and delay if so */
1249         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1250                 schedule_work(work);
1251                 return;
1252         }
1253         opm = 0;
1254         npm = 0;
1255         ppm = 0;
1256         epm = 0;
1257         hpfpm = 0;
1258         cablepm = 0;
1259
1260         for (lpm = 0x80; lpm; lpm >>= 1) {
1261                 if (!(lpm & data->tbvpm))
1262                         continue;
1263                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1264                 memset(&data->cqr, 0, sizeof(data->cqr));
1265                 data->cqr.cpaddr = &data->ccw;
1266                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1267                                                      data->rcd_buffer,
1268                                                      lpm);
1269                 if (!rc) {
1270                         switch (dasd_eckd_path_access(data->rcd_buffer,
1271                                                       DASD_ECKD_RCD_DATA_SIZE)
1272                                 ) {
1273                         case 0x02:
1274                                 npm |= lpm;
1275                                 break;
1276                         case 0x03:
1277                                 ppm |= lpm;
1278                                 break;
1279                         }
1280                         opm |= lpm;
1281                 } else if (rc == -EOPNOTSUPP) {
1282                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1283                                         "path verification: No configuration "
1284                                         "data retrieved");
1285                         opm |= lpm;
1286                 } else if (rc == -EAGAIN) {
1287                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1288                                         "path verification: device is stopped,"
1289                                         " try again later");
1290                         epm |= lpm;
1291                 } else {
1292                         dev_warn(&device->cdev->dev,
1293                                  "Reading device feature codes failed "
1294                                  "(rc=%d) for new path %x\n", rc, lpm);
1295                         continue;
1296                 }
1297                 if (verify_fcx_max_data(device, lpm)) {
1298                         opm &= ~lpm;
1299                         npm &= ~lpm;
1300                         ppm &= ~lpm;
1301                         hpfpm |= lpm;
1302                         continue;
1303                 }
1304
1305                 /*
1306                  * save conf_data for comparison after
1307                  * rebuild_device_uid may have changed
1308                  * the original data
1309                  */
1310                 memcpy(&path_rcd_buf, data->rcd_buffer,
1311                        DASD_ECKD_RCD_DATA_SIZE);
1312                 path_private.conf_data = (void *) &path_rcd_buf;
1313                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1314                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1315                         path_private.conf_data = NULL;
1316                         path_private.conf_len = 0;
1317                         continue;
1318                 }
1319
1320                 /*
1321                  * compare path UID with device UID only if at least
1322                  * one valid path is left
1323                  * in other case the device UID may have changed and
1324                  * the first working path UID will be used as device UID
1325                  */
1326                 if (dasd_path_get_opm(device) &&
1327                     dasd_eckd_compare_path_uid(device, &path_private)) {
1328                         /*
1329                          * the comparison was not successful
1330                          * rebuild the device UID with at least one
1331                          * known path in case a z/VM hyperswap command
1332                          * has changed the device
1333                          *
1334                          * after this compare again
1335                          *
1336                          * if either the rebuild or the recompare fails
1337                          * the path can not be used
1338                          */
1339                         if (rebuild_device_uid(device, data) ||
1340                             dasd_eckd_compare_path_uid(
1341                                     device, &path_private)) {
1342                                 uid = &path_private.uid;
1343                                 if (strlen(uid->vduit) > 0)
1344                                         snprintf(print_uid, sizeof(print_uid),
1345                                                  "%s.%s.%04x.%02x.%s",
1346                                                  uid->vendor, uid->serial,
1347                                                  uid->ssid, uid->real_unit_addr,
1348                                                  uid->vduit);
1349                                 else
1350                                         snprintf(print_uid, sizeof(print_uid),
1351                                                  "%s.%s.%04x.%02x",
1352                                                  uid->vendor, uid->serial,
1353                                                  uid->ssid,
1354                                                  uid->real_unit_addr);
1355                                 dev_err(&device->cdev->dev,
1356                                         "The newly added channel path %02X "
1357                                         "will not be used because it leads "
1358                                         "to a different device %s\n",
1359                                         lpm, print_uid);
1360                                 opm &= ~lpm;
1361                                 npm &= ~lpm;
1362                                 ppm &= ~lpm;
1363                                 cablepm |= lpm;
1364                                 continue;
1365                         }
1366                 }
1367
1368                 /*
1369                  * There is a small chance that a path is lost again between
1370                  * above path verification and the following modification of
1371                  * the device opm mask. We could avoid that race here by using
1372                  * yet another path mask, but we rather deal with this unlikely
1373                  * situation in dasd_start_IO.
1374                  */
1375                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1376                 if (!dasd_path_get_opm(device) && opm) {
1377                         dasd_path_set_opm(device, opm);
1378                         dasd_generic_path_operational(device);
1379                 } else {
1380                         dasd_path_add_opm(device, opm);
1381                 }
1382                 dasd_path_add_nppm(device, npm);
1383                 dasd_path_add_ppm(device, ppm);
1384                 dasd_path_add_tbvpm(device, epm);
1385                 dasd_path_add_cablepm(device, cablepm);
1386                 dasd_path_add_nohpfpm(device, hpfpm);
1387                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1388         }
1389         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1390         dasd_put_device(device);
1391         if (data->isglobal)
1392                 mutex_unlock(&dasd_path_verification_mutex);
1393         else
1394                 kfree(data);
1395 }
1396
1397 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1398 {
1399         struct path_verification_work_data *data;
1400
1401         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1402         if (!data) {
1403                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1404                         data = path_verification_worker;
1405                         data->isglobal = 1;
1406                 } else
1407                         return -ENOMEM;
1408         } else {
1409                 memset(data, 0, sizeof(*data));
1410                 data->isglobal = 0;
1411         }
1412         INIT_WORK(&data->worker, do_path_verification_work);
1413         dasd_get_device(device);
1414         data->device = device;
1415         data->tbvpm = lpm;
1416         schedule_work(&data->worker);
1417         return 0;
1418 }
1419
1420 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1421 {
1422         struct dasd_eckd_private *private = device->private;
1423         unsigned long flags;
1424
1425         if (!private->fcx_max_data)
1426                 private->fcx_max_data = get_fcx_max_data(device);
1427         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1428         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1429         dasd_schedule_device_bh(device);
1430         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1431 }
1432
1433 static int dasd_eckd_read_features(struct dasd_device *device)
1434 {
1435         struct dasd_eckd_private *private = device->private;
1436         struct dasd_psf_prssd_data *prssdp;
1437         struct dasd_rssd_features *features;
1438         struct dasd_ccw_req *cqr;
1439         struct ccw1 *ccw;
1440         int rc;
1441
1442         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1443         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1444                                    (sizeof(struct dasd_psf_prssd_data) +
1445                                     sizeof(struct dasd_rssd_features)),
1446                                    device, NULL);
1447         if (IS_ERR(cqr)) {
1448                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1449                                 "allocate initialization request");
1450                 return PTR_ERR(cqr);
1451         }
1452         cqr->startdev = device;
1453         cqr->memdev = device;
1454         cqr->block = NULL;
1455         cqr->retries = 256;
1456         cqr->expires = 10 * HZ;
1457
1458         /* Prepare for Read Subsystem Data */
1459         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1460         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1461         prssdp->order = PSF_ORDER_PRSSD;
1462         prssdp->suborder = 0x41;        /* Read Feature Codes */
1463         /* all other bytes of prssdp must be zero */
1464
1465         ccw = cqr->cpaddr;
1466         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1467         ccw->count = sizeof(struct dasd_psf_prssd_data);
1468         ccw->flags |= CCW_FLAG_CC;
1469         ccw->cda = (__u32)(addr_t) prssdp;
1470
1471         /* Read Subsystem Data - feature codes */
1472         features = (struct dasd_rssd_features *) (prssdp + 1);
1473         memset(features, 0, sizeof(struct dasd_rssd_features));
1474
1475         ccw++;
1476         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1477         ccw->count = sizeof(struct dasd_rssd_features);
1478         ccw->cda = (__u32)(addr_t) features;
1479
1480         cqr->buildclk = get_tod_clock();
1481         cqr->status = DASD_CQR_FILLED;
1482         rc = dasd_sleep_on(cqr);
1483         if (rc == 0) {
1484                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1485                 features = (struct dasd_rssd_features *) (prssdp + 1);
1486                 memcpy(&private->features, features,
1487                        sizeof(struct dasd_rssd_features));
1488         } else
1489                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1490                          " failed with rc=%d\n", rc);
1491         dasd_sfree_request(cqr, cqr->memdev);
1492         return rc;
1493 }
1494
1495
1496 /*
1497  * Build CP for Perform Subsystem Function - SSC.
1498  */
1499 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1500                                                     int enable_pav)
1501 {
1502         struct dasd_ccw_req *cqr;
1503         struct dasd_psf_ssc_data *psf_ssc_data;
1504         struct ccw1 *ccw;
1505
1506         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1507                                   sizeof(struct dasd_psf_ssc_data),
1508                                    device, NULL);
1509
1510         if (IS_ERR(cqr)) {
1511                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1512                            "Could not allocate PSF-SSC request");
1513                 return cqr;
1514         }
1515         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1516         psf_ssc_data->order = PSF_ORDER_SSC;
1517         psf_ssc_data->suborder = 0xc0;
1518         if (enable_pav) {
1519                 psf_ssc_data->suborder |= 0x08;
1520                 psf_ssc_data->reserved[0] = 0x88;
1521         }
1522         ccw = cqr->cpaddr;
1523         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1524         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1525         ccw->count = 66;
1526
1527         cqr->startdev = device;
1528         cqr->memdev = device;
1529         cqr->block = NULL;
1530         cqr->retries = 256;
1531         cqr->expires = 10*HZ;
1532         cqr->buildclk = get_tod_clock();
1533         cqr->status = DASD_CQR_FILLED;
1534         return cqr;
1535 }
1536
1537 /*
1538  * Perform Subsystem Function.
1539  * It is necessary to trigger CIO for channel revalidation since this
1540  * call might change behaviour of DASD devices.
1541  */
1542 static int
1543 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1544                   unsigned long flags)
1545 {
1546         struct dasd_ccw_req *cqr;
1547         int rc;
1548
1549         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1550         if (IS_ERR(cqr))
1551                 return PTR_ERR(cqr);
1552
1553         /*
1554          * set flags e.g. turn on failfast, to prevent blocking
1555          * the calling function should handle failed requests
1556          */
1557         cqr->flags |= flags;
1558
1559         rc = dasd_sleep_on(cqr);
1560         if (!rc)
1561                 /* trigger CIO to reprobe devices */
1562                 css_schedule_reprobe();
1563         else if (cqr->intrc == -EAGAIN)
1564                 rc = -EAGAIN;
1565
1566         dasd_sfree_request(cqr, cqr->memdev);
1567         return rc;
1568 }
1569
1570 /*
1571  * Valide storage server of current device.
1572  */
1573 static int dasd_eckd_validate_server(struct dasd_device *device,
1574                                      unsigned long flags)
1575 {
1576         struct dasd_eckd_private *private = device->private;
1577         int enable_pav, rc;
1578
1579         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1580             private->uid.type == UA_HYPER_PAV_ALIAS)
1581                 return 0;
1582         if (dasd_nopav || MACHINE_IS_VM)
1583                 enable_pav = 0;
1584         else
1585                 enable_pav = 1;
1586         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1587
1588         /* may be requested feature is not available on server,
1589          * therefore just report error and go ahead */
1590         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1591                         "returned rc=%d", private->uid.ssid, rc);
1592         return rc;
1593 }
1594
1595 /*
1596  * worker to do a validate server in case of a lost pathgroup
1597  */
1598 static void dasd_eckd_do_validate_server(struct work_struct *work)
1599 {
1600         struct dasd_device *device = container_of(work, struct dasd_device,
1601                                                   kick_validate);
1602         unsigned long flags = 0;
1603
1604         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1605         if (dasd_eckd_validate_server(device, flags)
1606             == -EAGAIN) {
1607                 /* schedule worker again if failed */
1608                 schedule_work(&device->kick_validate);
1609                 return;
1610         }
1611
1612         dasd_put_device(device);
1613 }
1614
1615 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1616 {
1617         dasd_get_device(device);
1618         /* exit if device not online or in offline processing */
1619         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1620            device->state < DASD_STATE_ONLINE) {
1621                 dasd_put_device(device);
1622                 return;
1623         }
1624         /* queue call to do_validate_server to the kernel event daemon. */
1625         if (!schedule_work(&device->kick_validate))
1626                 dasd_put_device(device);
1627 }
1628
1629 /*
1630  * Check device characteristics.
1631  * If the device is accessible using ECKD discipline, the device is enabled.
1632  */
1633 static int
1634 dasd_eckd_check_characteristics(struct dasd_device *device)
1635 {
1636         struct dasd_eckd_private *private = device->private;
1637         struct dasd_block *block;
1638         struct dasd_uid temp_uid;
1639         int rc, i;
1640         int readonly;
1641         unsigned long value;
1642
1643         /* setup work queue for validate server*/
1644         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1645         /* setup work queue for summary unit check */
1646         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1647
1648         if (!ccw_device_is_pathgroup(device->cdev)) {
1649                 dev_warn(&device->cdev->dev,
1650                          "A channel path group could not be established\n");
1651                 return -EIO;
1652         }
1653         if (!ccw_device_is_multipath(device->cdev)) {
1654                 dev_info(&device->cdev->dev,
1655                          "The DASD is not operating in multipath mode\n");
1656         }
1657         if (!private) {
1658                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1659                 if (!private) {
1660                         dev_warn(&device->cdev->dev,
1661                                  "Allocating memory for private DASD data "
1662                                  "failed\n");
1663                         return -ENOMEM;
1664                 }
1665                 device->private = private;
1666         } else {
1667                 memset(private, 0, sizeof(*private));
1668         }
1669         /* Invalidate status of initial analysis. */
1670         private->init_cqr_status = -1;
1671         /* Set default cache operations. */
1672         private->attrib.operation = DASD_NORMAL_CACHE;
1673         private->attrib.nr_cyl = 0;
1674
1675         /* Read Configuration Data */
1676         rc = dasd_eckd_read_conf(device);
1677         if (rc)
1678                 goto out_err1;
1679
1680         /* set some default values */
1681         device->default_expires = DASD_EXPIRES;
1682         device->default_retries = DASD_RETRIES;
1683         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
1684         device->path_interval = DASD_ECKD_PATH_INTERVAL;
1685
1686         if (private->gneq) {
1687                 value = 1;
1688                 for (i = 0; i < private->gneq->timeout.value; i++)
1689                         value = 10 * value;
1690                 value = value * private->gneq->timeout.number;
1691                 /* do not accept useless values */
1692                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1693                         device->default_expires = value;
1694         }
1695
1696         dasd_eckd_get_uid(device, &temp_uid);
1697         if (temp_uid.type == UA_BASE_DEVICE) {
1698                 block = dasd_alloc_block();
1699                 if (IS_ERR(block)) {
1700                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1701                                         "could not allocate dasd "
1702                                         "block structure");
1703                         rc = PTR_ERR(block);
1704                         goto out_err1;
1705                 }
1706                 device->block = block;
1707                 block->base = device;
1708         }
1709
1710         /* register lcu with alias handling, enable PAV */
1711         rc = dasd_alias_make_device_known_to_lcu(device);
1712         if (rc)
1713                 goto out_err2;
1714
1715         dasd_eckd_validate_server(device, 0);
1716
1717         /* device may report different configuration data after LCU setup */
1718         rc = dasd_eckd_read_conf(device);
1719         if (rc)
1720                 goto out_err3;
1721
1722         /* Read Feature Codes */
1723         dasd_eckd_read_features(device);
1724
1725         /* Read Device Characteristics */
1726         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1727                                          &private->rdc_data, 64);
1728         if (rc) {
1729                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1730                                 "Read device characteristic failed, rc=%d", rc);
1731                 goto out_err3;
1732         }
1733
1734         if ((device->features & DASD_FEATURE_USERAW) &&
1735             !(private->rdc_data.facilities.RT_in_LR)) {
1736                 dev_err(&device->cdev->dev, "The storage server does not "
1737                         "support raw-track access\n");
1738                 rc = -EINVAL;
1739                 goto out_err3;
1740         }
1741
1742         /* find the valid cylinder size */
1743         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1744             private->rdc_data.long_no_cyl)
1745                 private->real_cyl = private->rdc_data.long_no_cyl;
1746         else
1747                 private->real_cyl = private->rdc_data.no_cyl;
1748
1749         private->fcx_max_data = get_fcx_max_data(device);
1750
1751         readonly = dasd_device_is_ro(device);
1752         if (readonly)
1753                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1754
1755         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1756                  "with %d cylinders, %d heads, %d sectors%s\n",
1757                  private->rdc_data.dev_type,
1758                  private->rdc_data.dev_model,
1759                  private->rdc_data.cu_type,
1760                  private->rdc_data.cu_model.model,
1761                  private->real_cyl,
1762                  private->rdc_data.trk_per_cyl,
1763                  private->rdc_data.sec_per_trk,
1764                  readonly ? ", read-only device" : "");
1765         return 0;
1766
1767 out_err3:
1768         dasd_alias_disconnect_device_from_lcu(device);
1769 out_err2:
1770         dasd_free_block(device->block);
1771         device->block = NULL;
1772 out_err1:
1773         dasd_eckd_clear_conf_data(device);
1774         kfree(device->private);
1775         device->private = NULL;
1776         return rc;
1777 }
1778
1779 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1780 {
1781         struct dasd_eckd_private *private = device->private;
1782
1783         if (!private)
1784                 return;
1785
1786         dasd_alias_disconnect_device_from_lcu(device);
1787         private->ned = NULL;
1788         private->sneq = NULL;
1789         private->vdsneq = NULL;
1790         private->gneq = NULL;
1791         dasd_eckd_clear_conf_data(device);
1792 }
1793
1794 static struct dasd_ccw_req *
1795 dasd_eckd_analysis_ccw(struct dasd_device *device)
1796 {
1797         struct dasd_eckd_private *private = device->private;
1798         struct eckd_count *count_data;
1799         struct LO_eckd_data *LO_data;
1800         struct dasd_ccw_req *cqr;
1801         struct ccw1 *ccw;
1802         int cplength, datasize;
1803         int i;
1804
1805         cplength = 8;
1806         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1807         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
1808                                    NULL);
1809         if (IS_ERR(cqr))
1810                 return cqr;
1811         ccw = cqr->cpaddr;
1812         /* Define extent for the first 3 tracks. */
1813         define_extent(ccw++, cqr->data, 0, 2,
1814                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1815         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1816         /* Locate record for the first 4 records on track 0. */
1817         ccw[-1].flags |= CCW_FLAG_CC;
1818         locate_record(ccw++, LO_data++, 0, 0, 4,
1819                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1820
1821         count_data = private->count_area;
1822         for (i = 0; i < 4; i++) {
1823                 ccw[-1].flags |= CCW_FLAG_CC;
1824                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1825                 ccw->flags = 0;
1826                 ccw->count = 8;
1827                 ccw->cda = (__u32)(addr_t) count_data;
1828                 ccw++;
1829                 count_data++;
1830         }
1831
1832         /* Locate record for the first record on track 2. */
1833         ccw[-1].flags |= CCW_FLAG_CC;
1834         locate_record(ccw++, LO_data++, 2, 0, 1,
1835                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1836         /* Read count ccw. */
1837         ccw[-1].flags |= CCW_FLAG_CC;
1838         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1839         ccw->flags = 0;
1840         ccw->count = 8;
1841         ccw->cda = (__u32)(addr_t) count_data;
1842
1843         cqr->block = NULL;
1844         cqr->startdev = device;
1845         cqr->memdev = device;
1846         cqr->retries = 255;
1847         cqr->buildclk = get_tod_clock();
1848         cqr->status = DASD_CQR_FILLED;
1849         return cqr;
1850 }
1851
1852 /* differentiate between 'no record found' and any other error */
1853 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1854 {
1855         char *sense;
1856         if (init_cqr->status == DASD_CQR_DONE)
1857                 return INIT_CQR_OK;
1858         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1859                  init_cqr->status == DASD_CQR_FAILED) {
1860                 sense = dasd_get_sense(&init_cqr->irb);
1861                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1862                         return INIT_CQR_UNFORMATTED;
1863                 else
1864                         return INIT_CQR_ERROR;
1865         } else
1866                 return INIT_CQR_ERROR;
1867 }
1868
1869 /*
1870  * This is the callback function for the init_analysis cqr. It saves
1871  * the status of the initial analysis ccw before it frees it and kicks
1872  * the device to continue the startup sequence. This will call
1873  * dasd_eckd_do_analysis again (if the devices has not been marked
1874  * for deletion in the meantime).
1875  */
1876 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1877                                         void *data)
1878 {
1879         struct dasd_device *device = init_cqr->startdev;
1880         struct dasd_eckd_private *private = device->private;
1881
1882         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1883         dasd_sfree_request(init_cqr, device);
1884         dasd_kick_device(device);
1885 }
1886
1887 static int dasd_eckd_start_analysis(struct dasd_block *block)
1888 {
1889         struct dasd_ccw_req *init_cqr;
1890
1891         init_cqr = dasd_eckd_analysis_ccw(block->base);
1892         if (IS_ERR(init_cqr))
1893                 return PTR_ERR(init_cqr);
1894         init_cqr->callback = dasd_eckd_analysis_callback;
1895         init_cqr->callback_data = NULL;
1896         init_cqr->expires = 5*HZ;
1897         /* first try without ERP, so we can later handle unformatted
1898          * devices as special case
1899          */
1900         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1901         init_cqr->retries = 0;
1902         dasd_add_request_head(init_cqr);
1903         return -EAGAIN;
1904 }
1905
1906 static int dasd_eckd_end_analysis(struct dasd_block *block)
1907 {
1908         struct dasd_device *device = block->base;
1909         struct dasd_eckd_private *private = device->private;
1910         struct eckd_count *count_area;
1911         unsigned int sb, blk_per_trk;
1912         int status, i;
1913         struct dasd_ccw_req *init_cqr;
1914
1915         status = private->init_cqr_status;
1916         private->init_cqr_status = -1;
1917         if (status == INIT_CQR_ERROR) {
1918                 /* try again, this time with full ERP */
1919                 init_cqr = dasd_eckd_analysis_ccw(device);
1920                 dasd_sleep_on(init_cqr);
1921                 status = dasd_eckd_analysis_evaluation(init_cqr);
1922                 dasd_sfree_request(init_cqr, device);
1923         }
1924
1925         if (device->features & DASD_FEATURE_USERAW) {
1926                 block->bp_block = DASD_RAW_BLOCKSIZE;
1927                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1928                 block->s2b_shift = 3;
1929                 goto raw;
1930         }
1931
1932         if (status == INIT_CQR_UNFORMATTED) {
1933                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1934                 return -EMEDIUMTYPE;
1935         } else if (status == INIT_CQR_ERROR) {
1936                 dev_err(&device->cdev->dev,
1937                         "Detecting the DASD disk layout failed because "
1938                         "of an I/O error\n");
1939                 return -EIO;
1940         }
1941
1942         private->uses_cdl = 1;
1943         /* Check Track 0 for Compatible Disk Layout */
1944         count_area = NULL;
1945         for (i = 0; i < 3; i++) {
1946                 if (private->count_area[i].kl != 4 ||
1947                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1948                     private->count_area[i].cyl != 0 ||
1949                     private->count_area[i].head != count_area_head[i] ||
1950                     private->count_area[i].record != count_area_rec[i]) {
1951                         private->uses_cdl = 0;
1952                         break;
1953                 }
1954         }
1955         if (i == 3)
1956                 count_area = &private->count_area[4];
1957
1958         if (private->uses_cdl == 0) {
1959                 for (i = 0; i < 5; i++) {
1960                         if ((private->count_area[i].kl != 0) ||
1961                             (private->count_area[i].dl !=
1962                              private->count_area[0].dl) ||
1963                             private->count_area[i].cyl !=  0 ||
1964                             private->count_area[i].head != count_area_head[i] ||
1965                             private->count_area[i].record != count_area_rec[i])
1966                                 break;
1967                 }
1968                 if (i == 5)
1969                         count_area = &private->count_area[0];
1970         } else {
1971                 if (private->count_area[3].record == 1)
1972                         dev_warn(&device->cdev->dev,
1973                                  "Track 0 has no records following the VTOC\n");
1974         }
1975
1976         if (count_area != NULL && count_area->kl == 0) {
1977                 /* we found notthing violating our disk layout */
1978                 if (dasd_check_blocksize(count_area->dl) == 0)
1979                         block->bp_block = count_area->dl;
1980         }
1981         if (block->bp_block == 0) {
1982                 dev_warn(&device->cdev->dev,
1983                          "The disk layout of the DASD is not supported\n");
1984                 return -EMEDIUMTYPE;
1985         }
1986         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1987         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1988                 block->s2b_shift++;
1989
1990         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1991
1992 raw:
1993         block->blocks = ((unsigned long) private->real_cyl *
1994                           private->rdc_data.trk_per_cyl *
1995                           blk_per_trk);
1996
1997         dev_info(&device->cdev->dev,
1998                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
1999                  "%s\n", (block->bp_block >> 10),
2000                  (((unsigned long) private->real_cyl *
2001                    private->rdc_data.trk_per_cyl *
2002                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2003                  ((blk_per_trk * block->bp_block) >> 10),
2004                  private->uses_cdl ?
2005                  "compatible disk layout" : "linux disk layout");
2006
2007         return 0;
2008 }
2009
2010 static int dasd_eckd_do_analysis(struct dasd_block *block)
2011 {
2012         struct dasd_eckd_private *private = block->base->private;
2013
2014         if (private->init_cqr_status < 0)
2015                 return dasd_eckd_start_analysis(block);
2016         else
2017                 return dasd_eckd_end_analysis(block);
2018 }
2019
2020 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2021 {
2022         return dasd_alias_add_device(device);
2023 };
2024
2025 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2026 {
2027         if (cancel_work_sync(&device->reload_device))
2028                 dasd_put_device(device);
2029         if (cancel_work_sync(&device->kick_validate))
2030                 dasd_put_device(device);
2031
2032         return 0;
2033 };
2034
2035 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2036 {
2037         return dasd_alias_remove_device(device);
2038 };
2039
2040 static int
2041 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2042 {
2043         struct dasd_eckd_private *private = block->base->private;
2044
2045         if (dasd_check_blocksize(block->bp_block) == 0) {
2046                 geo->sectors = recs_per_track(&private->rdc_data,
2047                                               0, block->bp_block);
2048         }
2049         geo->cylinders = private->rdc_data.no_cyl;
2050         geo->heads = private->rdc_data.trk_per_cyl;
2051         return 0;
2052 }
2053
2054 /*
2055  * Build the TCW request for the format check
2056  */
2057 static struct dasd_ccw_req *
2058 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2059                           int enable_pav, struct eckd_count *fmt_buffer,
2060                           int rpt)
2061 {
2062         struct dasd_eckd_private *start_priv;
2063         struct dasd_device *startdev = NULL;
2064         struct tidaw *last_tidaw = NULL;
2065         struct dasd_ccw_req *cqr;
2066         struct itcw *itcw;
2067         int itcw_size;
2068         int count;
2069         int rc;
2070         int i;
2071
2072         if (enable_pav)
2073                 startdev = dasd_alias_get_start_dev(base);
2074
2075         if (!startdev)
2076                 startdev = base;
2077
2078         start_priv = startdev->private;
2079
2080         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2081
2082         /*
2083          * we're adding 'count' amount of tidaw to the itcw.
2084          * calculate the corresponding itcw_size
2085          */
2086         itcw_size = itcw_calc_size(0, count, 0);
2087
2088         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
2089                                    NULL);
2090         if (IS_ERR(cqr))
2091                 return cqr;
2092
2093         start_priv->count++;
2094
2095         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2096         if (IS_ERR(itcw)) {
2097                 rc = -EINVAL;
2098                 goto out_err;
2099         }
2100
2101         cqr->cpaddr = itcw_get_tcw(itcw);
2102         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2103                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2104                           sizeof(struct eckd_count),
2105                           count * sizeof(struct eckd_count), 0, rpt);
2106         if (rc)
2107                 goto out_err;
2108
2109         for (i = 0; i < count; i++) {
2110                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2111                                             sizeof(struct eckd_count));
2112                 if (IS_ERR(last_tidaw)) {
2113                         rc = -EINVAL;
2114                         goto out_err;
2115                 }
2116         }
2117
2118         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2119         itcw_finalize(itcw);
2120
2121         cqr->cpmode = 1;
2122         cqr->startdev = startdev;
2123         cqr->memdev = startdev;
2124         cqr->basedev = base;
2125         cqr->retries = startdev->default_retries;
2126         cqr->expires = startdev->default_expires * HZ;
2127         cqr->buildclk = get_tod_clock();
2128         cqr->status = DASD_CQR_FILLED;
2129         /* Set flags to suppress output for expected errors */
2130         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2131         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2132
2133         return cqr;
2134
2135 out_err:
2136         dasd_sfree_request(cqr, startdev);
2137
2138         return ERR_PTR(rc);
2139 }
2140
2141 /*
2142  * Build the CCW request for the format check
2143  */
2144 static struct dasd_ccw_req *
2145 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2146                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2147 {
2148         struct dasd_eckd_private *start_priv;
2149         struct dasd_eckd_private *base_priv;
2150         struct dasd_device *startdev = NULL;
2151         struct dasd_ccw_req *cqr;
2152         struct ccw1 *ccw;
2153         void *data;
2154         int cplength, datasize;
2155         int use_prefix;
2156         int count;
2157         int i;
2158
2159         if (enable_pav)
2160                 startdev = dasd_alias_get_start_dev(base);
2161
2162         if (!startdev)
2163                 startdev = base;
2164
2165         start_priv = startdev->private;
2166         base_priv = base->private;
2167
2168         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2169
2170         use_prefix = base_priv->features.feature[8] & 0x01;
2171
2172         if (use_prefix) {
2173                 cplength = 1;
2174                 datasize = sizeof(struct PFX_eckd_data);
2175         } else {
2176                 cplength = 2;
2177                 datasize = sizeof(struct DE_eckd_data) +
2178                         sizeof(struct LO_eckd_data);
2179         }
2180         cplength += count;
2181
2182         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2183                                    startdev, NULL);
2184         if (IS_ERR(cqr))
2185                 return cqr;
2186
2187         start_priv->count++;
2188         data = cqr->data;
2189         ccw = cqr->cpaddr;
2190
2191         if (use_prefix) {
2192                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2193                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2194                            count, 0, 0);
2195         } else {
2196                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2197                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2198
2199                 data += sizeof(struct DE_eckd_data);
2200                 ccw[-1].flags |= CCW_FLAG_CC;
2201
2202                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2203                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2204         }
2205
2206         for (i = 0; i < count; i++) {
2207                 ccw[-1].flags |= CCW_FLAG_CC;
2208                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2209                 ccw->flags = CCW_FLAG_SLI;
2210                 ccw->count = 8;
2211                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2212                 ccw++;
2213                 fmt_buffer++;
2214         }
2215
2216         cqr->startdev = startdev;
2217         cqr->memdev = startdev;
2218         cqr->basedev = base;
2219         cqr->retries = DASD_RETRIES;
2220         cqr->expires = startdev->default_expires * HZ;
2221         cqr->buildclk = get_tod_clock();
2222         cqr->status = DASD_CQR_FILLED;
2223         /* Set flags to suppress output for expected errors */
2224         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2225
2226         return cqr;
2227 }
2228
2229 static struct dasd_ccw_req *
2230 dasd_eckd_build_format(struct dasd_device *base,
2231                        struct format_data_t *fdata,
2232                        int enable_pav)
2233 {
2234         struct dasd_eckd_private *base_priv;
2235         struct dasd_eckd_private *start_priv;
2236         struct dasd_device *startdev = NULL;
2237         struct dasd_ccw_req *fcp;
2238         struct eckd_count *ect;
2239         struct ch_t address;
2240         struct ccw1 *ccw;
2241         void *data;
2242         int rpt;
2243         int cplength, datasize;
2244         int i, j;
2245         int intensity = 0;
2246         int r0_perm;
2247         int nr_tracks;
2248         int use_prefix;
2249
2250         if (enable_pav)
2251                 startdev = dasd_alias_get_start_dev(base);
2252
2253         if (!startdev)
2254                 startdev = base;
2255
2256         start_priv = startdev->private;
2257         base_priv = base->private;
2258
2259         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2260
2261         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2262
2263         /*
2264          * fdata->intensity is a bit string that tells us what to do:
2265          *   Bit 0: write record zero
2266          *   Bit 1: write home address, currently not supported
2267          *   Bit 2: invalidate tracks
2268          *   Bit 3: use OS/390 compatible disk layout (cdl)
2269          *   Bit 4: do not allow storage subsystem to modify record zero
2270          * Only some bit combinations do make sense.
2271          */
2272         if (fdata->intensity & 0x10) {
2273                 r0_perm = 0;
2274                 intensity = fdata->intensity & ~0x10;
2275         } else {
2276                 r0_perm = 1;
2277                 intensity = fdata->intensity;
2278         }
2279
2280         use_prefix = base_priv->features.feature[8] & 0x01;
2281
2282         switch (intensity) {
2283         case 0x00:      /* Normal format */
2284         case 0x08:      /* Normal format, use cdl. */
2285                 cplength = 2 + (rpt*nr_tracks);
2286                 if (use_prefix)
2287                         datasize = sizeof(struct PFX_eckd_data) +
2288                                 sizeof(struct LO_eckd_data) +
2289                                 rpt * nr_tracks * sizeof(struct eckd_count);
2290                 else
2291                         datasize = sizeof(struct DE_eckd_data) +
2292                                 sizeof(struct LO_eckd_data) +
2293                                 rpt * nr_tracks * sizeof(struct eckd_count);
2294                 break;
2295         case 0x01:      /* Write record zero and format track. */
2296         case 0x09:      /* Write record zero and format track, use cdl. */
2297                 cplength = 2 + rpt * nr_tracks;
2298                 if (use_prefix)
2299                         datasize = sizeof(struct PFX_eckd_data) +
2300                                 sizeof(struct LO_eckd_data) +
2301                                 sizeof(struct eckd_count) +
2302                                 rpt * nr_tracks * sizeof(struct eckd_count);
2303                 else
2304                         datasize = sizeof(struct DE_eckd_data) +
2305                                 sizeof(struct LO_eckd_data) +
2306                                 sizeof(struct eckd_count) +
2307                                 rpt * nr_tracks * sizeof(struct eckd_count);
2308                 break;
2309         case 0x04:      /* Invalidate track. */
2310         case 0x0c:      /* Invalidate track, use cdl. */
2311                 cplength = 3;
2312                 if (use_prefix)
2313                         datasize = sizeof(struct PFX_eckd_data) +
2314                                 sizeof(struct LO_eckd_data) +
2315                                 sizeof(struct eckd_count);
2316                 else
2317                         datasize = sizeof(struct DE_eckd_data) +
2318                                 sizeof(struct LO_eckd_data) +
2319                                 sizeof(struct eckd_count);
2320                 break;
2321         default:
2322                 dev_warn(&startdev->cdev->dev,
2323                          "An I/O control call used incorrect flags 0x%x\n",
2324                          fdata->intensity);
2325                 return ERR_PTR(-EINVAL);
2326         }
2327         /* Allocate the format ccw request. */
2328         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2329                                    datasize, startdev, NULL);
2330         if (IS_ERR(fcp))
2331                 return fcp;
2332
2333         start_priv->count++;
2334         data = fcp->data;
2335         ccw = fcp->cpaddr;
2336
2337         switch (intensity & ~0x08) {
2338         case 0x00: /* Normal format. */
2339                 if (use_prefix) {
2340                         prefix(ccw++, (struct PFX_eckd_data *) data,
2341                                fdata->start_unit, fdata->stop_unit,
2342                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2343                         /* grant subsystem permission to format R0 */
2344                         if (r0_perm)
2345                                 ((struct PFX_eckd_data *)data)
2346                                         ->define_extent.ga_extended |= 0x04;
2347                         data += sizeof(struct PFX_eckd_data);
2348                 } else {
2349                         define_extent(ccw++, (struct DE_eckd_data *) data,
2350                                       fdata->start_unit, fdata->stop_unit,
2351                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2352                         /* grant subsystem permission to format R0 */
2353                         if (r0_perm)
2354                                 ((struct DE_eckd_data *) data)
2355                                         ->ga_extended |= 0x04;
2356                         data += sizeof(struct DE_eckd_data);
2357                 }
2358                 ccw[-1].flags |= CCW_FLAG_CC;
2359                 locate_record(ccw++, (struct LO_eckd_data *) data,
2360                               fdata->start_unit, 0, rpt*nr_tracks,
2361                               DASD_ECKD_CCW_WRITE_CKD, base,
2362                               fdata->blksize);
2363                 data += sizeof(struct LO_eckd_data);
2364                 break;
2365         case 0x01: /* Write record zero + format track. */
2366                 if (use_prefix) {
2367                         prefix(ccw++, (struct PFX_eckd_data *) data,
2368                                fdata->start_unit, fdata->stop_unit,
2369                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2370                                base, startdev);
2371                         data += sizeof(struct PFX_eckd_data);
2372                 } else {
2373                         define_extent(ccw++, (struct DE_eckd_data *) data,
2374                                fdata->start_unit, fdata->stop_unit,
2375                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2376                         data += sizeof(struct DE_eckd_data);
2377                 }
2378                 ccw[-1].flags |= CCW_FLAG_CC;
2379                 locate_record(ccw++, (struct LO_eckd_data *) data,
2380                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2381                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2382                               base->block->bp_block);
2383                 data += sizeof(struct LO_eckd_data);
2384                 break;
2385         case 0x04: /* Invalidate track. */
2386                 if (use_prefix) {
2387                         prefix(ccw++, (struct PFX_eckd_data *) data,
2388                                fdata->start_unit, fdata->stop_unit,
2389                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2390                         data += sizeof(struct PFX_eckd_data);
2391                 } else {
2392                         define_extent(ccw++, (struct DE_eckd_data *) data,
2393                                fdata->start_unit, fdata->stop_unit,
2394                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2395                         data += sizeof(struct DE_eckd_data);
2396                 }
2397                 ccw[-1].flags |= CCW_FLAG_CC;
2398                 locate_record(ccw++, (struct LO_eckd_data *) data,
2399                               fdata->start_unit, 0, 1,
2400                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2401                 data += sizeof(struct LO_eckd_data);
2402                 break;
2403         }
2404
2405         for (j = 0; j < nr_tracks; j++) {
2406                 /* calculate cylinder and head for the current track */
2407                 set_ch_t(&address,
2408                          (fdata->start_unit + j) /
2409                          base_priv->rdc_data.trk_per_cyl,
2410                          (fdata->start_unit + j) %
2411                          base_priv->rdc_data.trk_per_cyl);
2412                 if (intensity & 0x01) { /* write record zero */
2413                         ect = (struct eckd_count *) data;
2414                         data += sizeof(struct eckd_count);
2415                         ect->cyl = address.cyl;
2416                         ect->head = address.head;
2417                         ect->record = 0;
2418                         ect->kl = 0;
2419                         ect->dl = 8;
2420                         ccw[-1].flags |= CCW_FLAG_CC;
2421                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2422                         ccw->flags = CCW_FLAG_SLI;
2423                         ccw->count = 8;
2424                         ccw->cda = (__u32)(addr_t) ect;
2425                         ccw++;
2426                 }
2427                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2428                         ect = (struct eckd_count *) data;
2429                         data += sizeof(struct eckd_count);
2430                         ect->cyl = address.cyl;
2431                         ect->head = address.head;
2432                         ect->record = 1;
2433                         ect->kl = 0;
2434                         ect->dl = 0;
2435                         ccw[-1].flags |= CCW_FLAG_CC;
2436                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2437                         ccw->flags = CCW_FLAG_SLI;
2438                         ccw->count = 8;
2439                         ccw->cda = (__u32)(addr_t) ect;
2440                 } else {                /* write remaining records */
2441                         for (i = 0; i < rpt; i++) {
2442                                 ect = (struct eckd_count *) data;
2443                                 data += sizeof(struct eckd_count);
2444                                 ect->cyl = address.cyl;
2445                                 ect->head = address.head;
2446                                 ect->record = i + 1;
2447                                 ect->kl = 0;
2448                                 ect->dl = fdata->blksize;
2449                                 /*
2450                                  * Check for special tracks 0-1
2451                                  * when formatting CDL
2452                                  */
2453                                 if ((intensity & 0x08) &&
2454                                     address.cyl == 0 && address.head == 0) {
2455                                         if (i < 3) {
2456                                                 ect->kl = 4;
2457                                                 ect->dl = sizes_trk0[i] - 4;
2458                                         }
2459                                 }
2460                                 if ((intensity & 0x08) &&
2461                                     address.cyl == 0 && address.head == 1) {
2462                                         ect->kl = 44;
2463                                         ect->dl = LABEL_SIZE - 44;
2464                                 }
2465                                 ccw[-1].flags |= CCW_FLAG_CC;
2466                                 if (i != 0 || j == 0)
2467                                         ccw->cmd_code =
2468                                                 DASD_ECKD_CCW_WRITE_CKD;
2469                                 else
2470                                         ccw->cmd_code =
2471                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2472                                 ccw->flags = CCW_FLAG_SLI;
2473                                 ccw->count = 8;
2474                                 ccw->cda = (__u32)(addr_t) ect;
2475                                 ccw++;
2476                         }
2477                 }
2478         }
2479
2480         fcp->startdev = startdev;
2481         fcp->memdev = startdev;
2482         fcp->basedev = base;
2483         fcp->retries = 256;
2484         fcp->expires = startdev->default_expires * HZ;
2485         fcp->buildclk = get_tod_clock();
2486         fcp->status = DASD_CQR_FILLED;
2487
2488         return fcp;
2489 }
2490
2491 /*
2492  * Wrapper function to build a CCW request depending on input data
2493  */
2494 static struct dasd_ccw_req *
2495 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2496                                struct format_data_t *fdata, int enable_pav,
2497                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2498 {
2499         struct dasd_ccw_req *ccw_req;
2500
2501         if (!fmt_buffer) {
2502                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2503         } else {
2504                 if (tpm)
2505                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2506                                                             enable_pav,
2507                                                             fmt_buffer, rpt);
2508                 else
2509                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2510                                                         fmt_buffer, rpt);
2511         }
2512
2513         return ccw_req;
2514 }
2515
2516 /*
2517  * Sanity checks on format_data
2518  */
2519 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2520                                           struct format_data_t *fdata)
2521 {
2522         struct dasd_eckd_private *private = base->private;
2523
2524         if (fdata->start_unit >=
2525             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2526                 dev_warn(&base->cdev->dev,
2527                          "Start track number %u used in formatting is too big\n",
2528                          fdata->start_unit);
2529                 return -EINVAL;
2530         }
2531         if (fdata->stop_unit >=
2532             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2533                 dev_warn(&base->cdev->dev,
2534                          "Stop track number %u used in formatting is too big\n",
2535                          fdata->stop_unit);
2536                 return -EINVAL;
2537         }
2538         if (fdata->start_unit > fdata->stop_unit) {
2539                 dev_warn(&base->cdev->dev,
2540                          "Start track %u used in formatting exceeds end track\n",
2541                          fdata->start_unit);
2542                 return -EINVAL;
2543         }
2544         if (dasd_check_blocksize(fdata->blksize) != 0) {
2545                 dev_warn(&base->cdev->dev,
2546                          "The DASD cannot be formatted with block size %u\n",
2547                          fdata->blksize);
2548                 return -EINVAL;
2549         }
2550         return 0;
2551 }
2552
2553 /*
2554  * This function will process format_data originally coming from an IOCTL
2555  */
2556 static int dasd_eckd_format_process_data(struct dasd_device *base,
2557                                          struct format_data_t *fdata,
2558                                          int enable_pav, int tpm,
2559                                          struct eckd_count *fmt_buffer, int rpt,
2560                                          struct irb *irb)
2561 {
2562         struct dasd_eckd_private *private = base->private;
2563         struct dasd_ccw_req *cqr, *n;
2564         struct list_head format_queue;
2565         struct dasd_device *device;
2566         char *sense = NULL;
2567         int old_start, old_stop, format_step;
2568         int step, retry;
2569         int rc;
2570
2571         rc = dasd_eckd_format_sanity_checks(base, fdata);
2572         if (rc)
2573                 return rc;
2574
2575         INIT_LIST_HEAD(&format_queue);
2576
2577         old_start = fdata->start_unit;
2578         old_stop = fdata->stop_unit;
2579
2580         if (!tpm && fmt_buffer != NULL) {
2581                 /* Command Mode / Format Check */
2582                 format_step = 1;
2583         } else if (tpm && fmt_buffer != NULL) {
2584                 /* Transport Mode / Format Check */
2585                 format_step = DASD_CQR_MAX_CCW / rpt;
2586         } else {
2587                 /* Normal Formatting */
2588                 format_step = DASD_CQR_MAX_CCW /
2589                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2590         }
2591
2592         do {
2593                 retry = 0;
2594                 while (fdata->start_unit <= old_stop) {
2595                         step = fdata->stop_unit - fdata->start_unit + 1;
2596                         if (step > format_step) {
2597                                 fdata->stop_unit =
2598                                         fdata->start_unit + format_step - 1;
2599                         }
2600
2601                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2602                                                              enable_pav, tpm,
2603                                                              fmt_buffer, rpt);
2604                         if (IS_ERR(cqr)) {
2605                                 rc = PTR_ERR(cqr);
2606                                 if (rc == -ENOMEM) {
2607                                         if (list_empty(&format_queue))
2608                                                 goto out;
2609                                         /*
2610                                          * not enough memory available, start
2611                                          * requests retry after first requests
2612                                          * were finished
2613                                          */
2614                                         retry = 1;
2615                                         break;
2616                                 }
2617                                 goto out_err;
2618                         }
2619                         list_add_tail(&cqr->blocklist, &format_queue);
2620
2621                         if (fmt_buffer) {
2622                                 step = fdata->stop_unit - fdata->start_unit + 1;
2623                                 fmt_buffer += rpt * step;
2624                         }
2625                         fdata->start_unit = fdata->stop_unit + 1;
2626                         fdata->stop_unit = old_stop;
2627                 }
2628
2629                 rc = dasd_sleep_on_queue(&format_queue);
2630
2631 out_err:
2632                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2633                         device = cqr->startdev;
2634                         private = device->private;
2635
2636                         if (cqr->status == DASD_CQR_FAILED) {
2637                                 /*
2638                                  * Only get sense data if called by format
2639                                  * check
2640                                  */
2641                                 if (fmt_buffer && irb) {
2642                                         sense = dasd_get_sense(&cqr->irb);
2643                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2644                                 }
2645                                 rc = -EIO;
2646                         }
2647                         list_del_init(&cqr->blocklist);
2648                         dasd_sfree_request(cqr, device);
2649                         private->count--;
2650                 }
2651
2652                 if (rc && rc != -EIO)
2653                         goto out;
2654                 if (rc == -EIO) {
2655                         /*
2656                          * In case fewer than the expected records are on the
2657                          * track, we will most likely get a 'No Record Found'
2658                          * error (in command mode) or a 'File Protected' error
2659                          * (in transport mode). Those particular cases shouldn't
2660                          * pass the -EIO to the IOCTL, therefore reset the rc
2661                          * and continue.
2662                          */
2663                         if (sense &&
2664                             (sense[1] & SNS1_NO_REC_FOUND ||
2665                              sense[1] & SNS1_FILE_PROTECTED))
2666                                 retry = 1;
2667                         else
2668                                 goto out;
2669                 }
2670
2671         } while (retry);
2672
2673 out:
2674         fdata->start_unit = old_start;
2675         fdata->stop_unit = old_stop;
2676
2677         return rc;
2678 }
2679
2680 static int dasd_eckd_format_device(struct dasd_device *base,
2681                                    struct format_data_t *fdata, int enable_pav)
2682 {
2683         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2684                                              0, NULL);
2685 }
2686
2687 /*
2688  * Helper function to count consecutive records of a single track.
2689  */
2690 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2691                                    int max)
2692 {
2693         int head;
2694         int i;
2695
2696         head = fmt_buffer[start].head;
2697
2698         /*
2699          * There are 3 conditions where we stop counting:
2700          * - if data reoccurs (same head and record may reoccur), which may
2701          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2702          * - when the head changes, because we're iterating over several tracks
2703          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2704          * - when we've reached the end of sensible data in the buffer (the
2705          *   record will be 0 then)
2706          */
2707         for (i = start; i < max; i++) {
2708                 if (i > start) {
2709                         if ((fmt_buffer[i].head == head &&
2710                             fmt_buffer[i].record == 1) ||
2711                             fmt_buffer[i].head != head ||
2712                             fmt_buffer[i].record == 0)
2713                                 break;
2714                 }
2715         }
2716
2717         return i - start;
2718 }
2719
2720 /*
2721  * Evaluate a given range of tracks. Data like number of records, blocksize,
2722  * record ids, and key length are compared with expected data.
2723  *
2724  * If a mismatch occurs, the corresponding error bit is set, as well as
2725  * additional information, depending on the error.
2726  */
2727 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2728                                              struct format_check_t *cdata,
2729                                              int rpt_max, int rpt_exp,
2730                                              int trk_per_cyl, int tpm)
2731 {
2732         struct ch_t geo;
2733         int max_entries;
2734         int count = 0;
2735         int trkcount;
2736         int blksize;
2737         int pos = 0;
2738         int i, j;
2739         int kl;
2740
2741         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2742         max_entries = trkcount * rpt_max;
2743
2744         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2745                 /* Calculate the correct next starting position in the buffer */
2746                 if (tpm) {
2747                         while (fmt_buffer[pos].record == 0 &&
2748                                fmt_buffer[pos].dl == 0) {
2749                                 if (pos++ > max_entries)
2750                                         break;
2751                         }
2752                 } else {
2753                         if (i != cdata->expect.start_unit)
2754                                 pos += rpt_max - count;
2755                 }
2756
2757                 /* Calculate the expected geo values for the current track */
2758                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2759
2760                 /* Count and check number of records */
2761                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2762
2763                 if (count < rpt_exp) {
2764                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2765                         break;
2766                 }
2767                 if (count > rpt_exp) {
2768                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2769                         break;
2770                 }
2771
2772                 for (j = 0; j < count; j++, pos++) {
2773                         blksize = cdata->expect.blksize;
2774                         kl = 0;
2775
2776                         /*
2777                          * Set special values when checking CDL formatted
2778                          * devices.
2779                          */
2780                         if ((cdata->expect.intensity & 0x08) &&
2781                             geo.cyl == 0 && geo.head == 0) {
2782                                 if (j < 3) {
2783                                         blksize = sizes_trk0[j] - 4;
2784                                         kl = 4;
2785                                 }
2786                         }
2787                         if ((cdata->expect.intensity & 0x08) &&
2788                             geo.cyl == 0 && geo.head == 1) {
2789                                 blksize = LABEL_SIZE - 44;
2790                                 kl = 44;
2791                         }
2792
2793                         /* Check blocksize */
2794                         if (fmt_buffer[pos].dl != blksize) {
2795                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2796                                 goto out;
2797                         }
2798                         /* Check if key length is 0 */
2799                         if (fmt_buffer[pos].kl != kl) {
2800                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2801                                 goto out;
2802                         }
2803                         /* Check if record_id is correct */
2804                         if (fmt_buffer[pos].cyl != geo.cyl ||
2805                             fmt_buffer[pos].head != geo.head ||
2806                             fmt_buffer[pos].record != (j + 1)) {
2807                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2808                                 goto out;
2809                         }
2810                 }
2811         }
2812
2813 out:
2814         /*
2815          * In case of no errors, we need to decrease by one
2816          * to get the correct positions.
2817          */
2818         if (!cdata->result) {
2819                 i--;
2820                 pos--;
2821         }
2822
2823         cdata->unit = i;
2824         cdata->num_records = count;
2825         cdata->rec = fmt_buffer[pos].record;
2826         cdata->blksize = fmt_buffer[pos].dl;
2827         cdata->key_length = fmt_buffer[pos].kl;
2828 }
2829
2830 /*
2831  * Check the format of a range of tracks of a DASD.
2832  */
2833 static int dasd_eckd_check_device_format(struct dasd_device *base,
2834                                          struct format_check_t *cdata,
2835                                          int enable_pav)
2836 {
2837         struct dasd_eckd_private *private = base->private;
2838         struct eckd_count *fmt_buffer;
2839         struct irb irb;
2840         int rpt_max, rpt_exp;
2841         int fmt_buffer_size;
2842         int trk_per_cyl;
2843         int trkcount;
2844         int tpm = 0;
2845         int rc;
2846
2847         trk_per_cyl = private->rdc_data.trk_per_cyl;
2848
2849         /* Get maximum and expected amount of records per track */
2850         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2851         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2852
2853         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2854         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2855
2856         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2857         if (!fmt_buffer)
2858                 return -ENOMEM;
2859
2860         /*
2861          * A certain FICON feature subset is needed to operate in transport
2862          * mode. Additionally, the support for transport mode is implicitly
2863          * checked by comparing the buffer size with fcx_max_data. As long as
2864          * the buffer size is smaller we can operate in transport mode and
2865          * process multiple tracks. If not, only one track at once is being
2866          * processed using command mode.
2867          */
2868         if ((private->features.feature[40] & 0x04) &&
2869             fmt_buffer_size <= private->fcx_max_data)
2870                 tpm = 1;
2871
2872         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2873                                            tpm, fmt_buffer, rpt_max, &irb);
2874         if (rc && rc != -EIO)
2875                 goto out;
2876         if (rc == -EIO) {
2877                 /*
2878                  * If our first attempt with transport mode enabled comes back
2879                  * with an incorrect length error, we're going to retry the
2880                  * check with command mode.
2881                  */
2882                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2883                         tpm = 0;
2884                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2885                                                            enable_pav, tpm,
2886                                                            fmt_buffer, rpt_max,
2887                                                            &irb);
2888                         if (rc)
2889                                 goto out;
2890                 } else {
2891                         goto out;
2892                 }
2893         }
2894
2895         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2896                                          trk_per_cyl, tpm);
2897
2898 out:
2899         kfree(fmt_buffer);
2900
2901         return rc;
2902 }
2903
2904 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2905 {
2906         if (cqr->retries < 0) {
2907                 cqr->status = DASD_CQR_FAILED;
2908                 return;
2909         }
2910         cqr->status = DASD_CQR_FILLED;
2911         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2912                 dasd_eckd_reset_ccw_to_base_io(cqr);
2913                 cqr->startdev = cqr->block->base;
2914                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2915         }
2916 };
2917
2918 static dasd_erp_fn_t
2919 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2920 {
2921         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2922         struct ccw_device *cdev = device->cdev;
2923
2924         switch (cdev->id.cu_type) {
2925         case 0x3990:
2926         case 0x2105:
2927         case 0x2107:
2928         case 0x1750:
2929                 return dasd_3990_erp_action;
2930         case 0x9343:
2931         case 0x3880:
2932         default:
2933                 return dasd_default_erp_action;
2934         }
2935 }
2936
2937 static dasd_erp_fn_t
2938 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2939 {
2940         return dasd_default_erp_postaction;
2941 }
2942
2943 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2944                                               struct dasd_ccw_req *cqr,
2945                                               struct irb *irb)
2946 {
2947         char mask;
2948         char *sense = NULL;
2949         struct dasd_eckd_private *private = device->private;
2950
2951         /* first of all check for state change pending interrupt */
2952         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2953         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2954                 /*
2955                  * for alias only, not in offline processing
2956                  * and only if not suspended
2957                  */
2958                 if (!device->block && private->lcu &&
2959                     device->state == DASD_STATE_ONLINE &&
2960                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2961                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2962                         /* schedule worker to reload device */
2963                         dasd_reload_device(device);
2964                 }
2965                 dasd_generic_handle_state_change(device);
2966                 return;
2967         }
2968
2969         sense = dasd_get_sense(irb);
2970         if (!sense)
2971                 return;
2972
2973         /* summary unit check */
2974         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2975             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2976                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2977                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2978                                       "eckd suc: device already notified");
2979                         return;
2980                 }
2981                 sense = dasd_get_sense(irb);
2982                 if (!sense) {
2983                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2984                                       "eckd suc: no reason code available");
2985                         clear_bit(DASD_FLAG_SUC, &device->flags);
2986                         return;
2987
2988                 }
2989                 private->suc_reason = sense[8];
2990                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
2991                               "eckd handle summary unit check: reason",
2992                               private->suc_reason);
2993                 dasd_get_device(device);
2994                 if (!schedule_work(&device->suc_work))
2995                         dasd_put_device(device);
2996
2997                 return;
2998         }
2999
3000         /* service information message SIM */
3001         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3002             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3003                 dasd_3990_erp_handle_sim(device, sense);
3004                 return;
3005         }
3006
3007         /* loss of device reservation is handled via base devices only
3008          * as alias devices may be used with several bases
3009          */
3010         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3011             (sense[7] == 0x3F) &&
3012             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3013             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3014                 if (device->features & DASD_FEATURE_FAILONSLCK)
3015                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3016                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3017                 dev_err(&device->cdev->dev,
3018                         "The device reservation was lost\n");
3019         }
3020 }
3021
3022 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3023                                                struct dasd_device *startdev,
3024                                                struct dasd_block *block,
3025                                                struct request *req,
3026                                                sector_t first_rec,
3027                                                sector_t last_rec,
3028                                                sector_t first_trk,
3029                                                sector_t last_trk,
3030                                                unsigned int first_offs,
3031                                                unsigned int last_offs,
3032                                                unsigned int blk_per_trk,
3033                                                unsigned int blksize)
3034 {
3035         struct dasd_eckd_private *private;
3036         unsigned long *idaws;
3037         struct LO_eckd_data *LO_data;
3038         struct dasd_ccw_req *cqr;
3039         struct ccw1 *ccw;
3040         struct req_iterator iter;
3041         struct bio_vec bv;
3042         char *dst;
3043         unsigned int off;
3044         int count, cidaw, cplength, datasize;
3045         sector_t recid;
3046         unsigned char cmd, rcmd;
3047         int use_prefix;
3048         struct dasd_device *basedev;
3049
3050         basedev = block->base;
3051         private = basedev->private;
3052         if (rq_data_dir(req) == READ)
3053                 cmd = DASD_ECKD_CCW_READ_MT;
3054         else if (rq_data_dir(req) == WRITE)
3055                 cmd = DASD_ECKD_CCW_WRITE_MT;
3056         else
3057                 return ERR_PTR(-EINVAL);
3058
3059         /* Check struct bio and count the number of blocks for the request. */
3060         count = 0;
3061         cidaw = 0;
3062         rq_for_each_segment(bv, req, iter) {
3063                 if (bv.bv_len & (blksize - 1))
3064                         /* Eckd can only do full blocks. */
3065                         return ERR_PTR(-EINVAL);
3066                 count += bv.bv_len >> (block->s2b_shift + 9);
3067                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3068                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3069         }
3070         /* Paranoia. */
3071         if (count != last_rec - first_rec + 1)
3072                 return ERR_PTR(-EINVAL);
3073
3074         /* use the prefix command if available */
3075         use_prefix = private->features.feature[8] & 0x01;
3076         if (use_prefix) {
3077                 /* 1x prefix + number of blocks */
3078                 cplength = 2 + count;
3079                 /* 1x prefix + cidaws*sizeof(long) */
3080                 datasize = sizeof(struct PFX_eckd_data) +
3081                         sizeof(struct LO_eckd_data) +
3082                         cidaw * sizeof(unsigned long);
3083         } else {
3084                 /* 1x define extent + 1x locate record + number of blocks */
3085                 cplength = 2 + count;
3086                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3087                 datasize = sizeof(struct DE_eckd_data) +
3088                         sizeof(struct LO_eckd_data) +
3089                         cidaw * sizeof(unsigned long);
3090         }
3091         /* Find out the number of additional locate record ccws for cdl. */
3092         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3093                 if (last_rec >= 2*blk_per_trk)
3094                         count = 2*blk_per_trk - first_rec;
3095                 cplength += count;
3096                 datasize += count*sizeof(struct LO_eckd_data);
3097         }
3098         /* Allocate the ccw request. */
3099         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3100                                    startdev, blk_mq_rq_to_pdu(req));
3101         if (IS_ERR(cqr))
3102                 return cqr;
3103         ccw = cqr->cpaddr;
3104         /* First ccw is define extent or prefix. */
3105         if (use_prefix) {
3106                 if (prefix(ccw++, cqr->data, first_trk,
3107                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3108                         /* Clock not in sync and XRC is enabled.
3109                          * Try again later.
3110                          */
3111                         dasd_sfree_request(cqr, startdev);
3112                         return ERR_PTR(-EAGAIN);
3113                 }
3114                 idaws = (unsigned long *) (cqr->data +
3115                                            sizeof(struct PFX_eckd_data));
3116         } else {
3117                 if (define_extent(ccw++, cqr->data, first_trk,
3118                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3119                         /* Clock not in sync and XRC is enabled.
3120                          * Try again later.
3121                          */
3122                         dasd_sfree_request(cqr, startdev);
3123                         return ERR_PTR(-EAGAIN);
3124                 }
3125                 idaws = (unsigned long *) (cqr->data +
3126                                            sizeof(struct DE_eckd_data));
3127         }
3128         /* Build locate_record+read/write/ccws. */
3129         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3130         recid = first_rec;
3131         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3132                 /* Only standard blocks so there is just one locate record. */
3133                 ccw[-1].flags |= CCW_FLAG_CC;
3134                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3135                               last_rec - recid + 1, cmd, basedev, blksize);
3136         }
3137         rq_for_each_segment(bv, req, iter) {
3138                 dst = page_address(bv.bv_page) + bv.bv_offset;
3139                 if (dasd_page_cache) {
3140                         char *copy = kmem_cache_alloc(dasd_page_cache,
3141                                                       GFP_DMA | __GFP_NOWARN);
3142                         if (copy && rq_data_dir(req) == WRITE)
3143                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3144                         if (copy)
3145                                 dst = copy + bv.bv_offset;
3146                 }
3147                 for (off = 0; off < bv.bv_len; off += blksize) {
3148                         sector_t trkid = recid;
3149                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3150                         rcmd = cmd;
3151                         count = blksize;
3152                         /* Locate record for cdl special block ? */
3153                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3154                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3155                                         rcmd |= 0x8;
3156                                         count = dasd_eckd_cdl_reclen(recid);
3157                                         if (count < blksize &&
3158                                             rq_data_dir(req) == READ)
3159                                                 memset(dst + count, 0xe5,
3160                                                        blksize - count);
3161                                 }
3162                                 ccw[-1].flags |= CCW_FLAG_CC;
3163                                 locate_record(ccw++, LO_data++,
3164                                               trkid, recoffs + 1,
3165                                               1, rcmd, basedev, count);
3166                         }
3167                         /* Locate record for standard blocks ? */
3168                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3169                                 ccw[-1].flags |= CCW_FLAG_CC;
3170                                 locate_record(ccw++, LO_data++,
3171                                               trkid, recoffs + 1,
3172                                               last_rec - recid + 1,
3173                                               cmd, basedev, count);
3174                         }
3175                         /* Read/write ccw. */
3176                         ccw[-1].flags |= CCW_FLAG_CC;
3177                         ccw->cmd_code = rcmd;
3178                         ccw->count = count;
3179                         if (idal_is_needed(dst, blksize)) {
3180                                 ccw->cda = (__u32)(addr_t) idaws;
3181                                 ccw->flags = CCW_FLAG_IDA;
3182                                 idaws = idal_create_words(idaws, dst, blksize);
3183                         } else {
3184                                 ccw->cda = (__u32)(addr_t) dst;
3185                                 ccw->flags = 0;
3186                         }
3187                         ccw++;
3188                         dst += blksize;
3189                         recid++;
3190                 }
3191         }
3192         if (blk_noretry_request(req) ||
3193             block->base->features & DASD_FEATURE_FAILFAST)
3194                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3195         cqr->startdev = startdev;
3196         cqr->memdev = startdev;
3197         cqr->block = block;
3198         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3199         cqr->lpm = dasd_path_get_ppm(startdev);
3200         cqr->retries = startdev->default_retries;
3201         cqr->buildclk = get_tod_clock();
3202         cqr->status = DASD_CQR_FILLED;
3203         return cqr;
3204 }
3205
3206 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3207                                                struct dasd_device *startdev,
3208                                                struct dasd_block *block,
3209                                                struct request *req,
3210                                                sector_t first_rec,
3211                                                sector_t last_rec,
3212                                                sector_t first_trk,
3213                                                sector_t last_trk,
3214                                                unsigned int first_offs,
3215                                                unsigned int last_offs,
3216                                                unsigned int blk_per_trk,
3217                                                unsigned int blksize)
3218 {
3219         unsigned long *idaws;
3220         struct dasd_ccw_req *cqr;
3221         struct ccw1 *ccw;
3222         struct req_iterator iter;
3223         struct bio_vec bv;
3224         char *dst, *idaw_dst;
3225         unsigned int cidaw, cplength, datasize;
3226         unsigned int tlf;
3227         sector_t recid;
3228         unsigned char cmd;
3229         struct dasd_device *basedev;
3230         unsigned int trkcount, count, count_to_trk_end;
3231         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3232         unsigned char new_track, end_idaw;
3233         sector_t trkid;
3234         unsigned int recoffs;
3235
3236         basedev = block->base;
3237         if (rq_data_dir(req) == READ)
3238                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3239         else if (rq_data_dir(req) == WRITE)
3240                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3241         else
3242                 return ERR_PTR(-EINVAL);
3243
3244         /* Track based I/O needs IDAWs for each page, and not just for
3245          * 64 bit addresses. We need additional idals for pages
3246          * that get filled from two tracks, so we use the number
3247          * of records as upper limit.
3248          */
3249         cidaw = last_rec - first_rec + 1;
3250         trkcount = last_trk - first_trk + 1;
3251
3252         /* 1x prefix + one read/write ccw per track */
3253         cplength = 1 + trkcount;
3254
3255         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3256
3257         /* Allocate the ccw request. */
3258         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3259                                    startdev, blk_mq_rq_to_pdu(req));
3260         if (IS_ERR(cqr))
3261                 return cqr;
3262         ccw = cqr->cpaddr;
3263         /* transfer length factor: how many bytes to read from the last track */
3264         if (first_trk == last_trk)
3265                 tlf = last_offs - first_offs + 1;
3266         else
3267                 tlf = last_offs + 1;
3268         tlf *= blksize;
3269
3270         if (prefix_LRE(ccw++, cqr->data, first_trk,
3271                        last_trk, cmd, basedev, startdev,
3272                        1 /* format */, first_offs + 1,
3273                        trkcount, blksize,
3274                        tlf) == -EAGAIN) {
3275                 /* Clock not in sync and XRC is enabled.
3276                  * Try again later.
3277                  */
3278                 dasd_sfree_request(cqr, startdev);
3279                 return ERR_PTR(-EAGAIN);
3280         }
3281
3282         /*
3283          * The translation of request into ccw programs must meet the
3284          * following conditions:
3285          * - all idaws but the first and the last must address full pages
3286          *   (or 2K blocks on 31-bit)
3287          * - the scope of a ccw and it's idal ends with the track boundaries
3288          */
3289         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3290         recid = first_rec;
3291         new_track = 1;
3292         end_idaw = 0;
3293         len_to_track_end = 0;
3294         idaw_dst = NULL;
3295         idaw_len = 0;
3296         rq_for_each_segment(bv, req, iter) {
3297                 dst = page_address(bv.bv_page) + bv.bv_offset;
3298                 seg_len = bv.bv_len;
3299                 while (seg_len) {
3300                         if (new_track) {
3301                                 trkid = recid;
3302                                 recoffs = sector_div(trkid, blk_per_trk);
3303                                 count_to_trk_end = blk_per_trk - recoffs;
3304                                 count = min((last_rec - recid + 1),
3305                                             (sector_t)count_to_trk_end);
3306                                 len_to_track_end = count * blksize;
3307                                 ccw[-1].flags |= CCW_FLAG_CC;
3308                                 ccw->cmd_code = cmd;
3309                                 ccw->count = len_to_track_end;
3310                                 ccw->cda = (__u32)(addr_t)idaws;
3311                                 ccw->flags = CCW_FLAG_IDA;
3312                                 ccw++;
3313                                 recid += count;
3314                                 new_track = 0;
3315                                 /* first idaw for a ccw may start anywhere */
3316                                 if (!idaw_dst)
3317                                         idaw_dst = dst;
3318                         }
3319                         /* If we start a new idaw, we must make sure that it
3320                          * starts on an IDA_BLOCK_SIZE boundary.
3321                          * If we continue an idaw, we must make sure that the
3322                          * current segment begins where the so far accumulated
3323                          * idaw ends
3324                          */
3325                         if (!idaw_dst) {
3326                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3327                                         dasd_sfree_request(cqr, startdev);
3328                                         return ERR_PTR(-ERANGE);
3329                                 } else
3330                                         idaw_dst = dst;
3331                         }
3332                         if ((idaw_dst + idaw_len) != dst) {
3333                                 dasd_sfree_request(cqr, startdev);
3334                                 return ERR_PTR(-ERANGE);
3335                         }
3336                         part_len = min(seg_len, len_to_track_end);
3337                         seg_len -= part_len;
3338                         dst += part_len;
3339                         idaw_len += part_len;
3340                         len_to_track_end -= part_len;
3341                         /* collected memory area ends on an IDA_BLOCK border,
3342                          * -> create an idaw
3343                          * idal_create_words will handle cases where idaw_len
3344                          * is larger then IDA_BLOCK_SIZE
3345                          */
3346                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3347                                 end_idaw = 1;
3348                         /* We also need to end the idaw at track end */
3349                         if (!len_to_track_end) {
3350                                 new_track = 1;
3351                                 end_idaw = 1;
3352                         }
3353                         if (end_idaw) {
3354                                 idaws = idal_create_words(idaws, idaw_dst,
3355                                                           idaw_len);
3356                                 idaw_dst = NULL;
3357                                 idaw_len = 0;
3358                                 end_idaw = 0;
3359                         }
3360                 }
3361         }
3362
3363         if (blk_noretry_request(req) ||
3364             block->base->features & DASD_FEATURE_FAILFAST)
3365                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3366         cqr->startdev = startdev;
3367         cqr->memdev = startdev;
3368         cqr->block = block;
3369         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3370         cqr->lpm = dasd_path_get_ppm(startdev);
3371         cqr->retries = startdev->default_retries;
3372         cqr->buildclk = get_tod_clock();
3373         cqr->status = DASD_CQR_FILLED;
3374         return cqr;
3375 }
3376
3377 static int prepare_itcw(struct itcw *itcw,
3378                         unsigned int trk, unsigned int totrk, int cmd,
3379                         struct dasd_device *basedev,
3380                         struct dasd_device *startdev,
3381                         unsigned int rec_on_trk, int count,
3382                         unsigned int blksize,
3383                         unsigned int total_data_size,
3384                         unsigned int tlf,
3385                         unsigned int blk_per_trk)
3386 {
3387         struct PFX_eckd_data pfxdata;
3388         struct dasd_eckd_private *basepriv, *startpriv;
3389         struct DE_eckd_data *dedata;
3390         struct LRE_eckd_data *lredata;
3391         struct dcw *dcw;
3392
3393         u32 begcyl, endcyl;
3394         u16 heads, beghead, endhead;
3395         u8 pfx_cmd;
3396
3397         int rc = 0;
3398         int sector = 0;
3399         int dn, d;
3400
3401
3402         /* setup prefix data */
3403         basepriv = basedev->private;
3404         startpriv = startdev->private;
3405         dedata = &pfxdata.define_extent;
3406         lredata = &pfxdata.locate_record;
3407
3408         memset(&pfxdata, 0, sizeof(pfxdata));
3409         pfxdata.format = 1; /* PFX with LRE */
3410         pfxdata.base_address = basepriv->ned->unit_addr;
3411         pfxdata.base_lss = basepriv->ned->ID;
3412         pfxdata.validity.define_extent = 1;
3413
3414         /* private uid is kept up to date, conf_data may be outdated */
3415         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3416                 pfxdata.validity.verify_base = 1;
3417
3418         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3419                 pfxdata.validity.verify_base = 1;
3420                 pfxdata.validity.hyper_pav = 1;
3421         }
3422
3423         switch (cmd) {
3424         case DASD_ECKD_CCW_READ_TRACK_DATA:
3425                 dedata->mask.perm = 0x1;
3426                 dedata->attributes.operation = basepriv->attrib.operation;
3427                 dedata->blk_size = blksize;
3428                 dedata->ga_extended |= 0x42;
3429                 lredata->operation.orientation = 0x0;
3430                 lredata->operation.operation = 0x0C;
3431                 lredata->auxiliary.check_bytes = 0x01;
3432                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3433                 break;
3434         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3435                 dedata->mask.perm = 0x02;
3436                 dedata->attributes.operation = basepriv->attrib.operation;
3437                 dedata->blk_size = blksize;
3438                 rc = set_timestamp(NULL, dedata, basedev);
3439                 dedata->ga_extended |= 0x42;
3440                 lredata->operation.orientation = 0x0;
3441                 lredata->operation.operation = 0x3F;
3442                 lredata->extended_operation = 0x23;
3443                 lredata->auxiliary.check_bytes = 0x2;
3444                 /*
3445                  * If XRC is supported the System Time Stamp is set. The
3446                  * validity of the time stamp must be reflected in the prefix
3447                  * data as well.
3448                  */
3449                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3450                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3451                 pfx_cmd = DASD_ECKD_CCW_PFX;
3452                 break;
3453         case DASD_ECKD_CCW_READ_COUNT_MT:
3454                 dedata->mask.perm = 0x1;
3455                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3456                 dedata->ga_extended |= 0x42;
3457                 dedata->blk_size = blksize;
3458                 lredata->operation.orientation = 0x2;
3459                 lredata->operation.operation = 0x16;
3460                 lredata->auxiliary.check_bytes = 0x01;
3461                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3462                 break;
3463         default:
3464                 DBF_DEV_EVENT(DBF_ERR, basedev,
3465                               "prepare itcw, unknown opcode 0x%x", cmd);
3466                 BUG();
3467                 break;
3468         }
3469         if (rc)
3470                 return rc;
3471
3472         dedata->attributes.mode = 0x3;  /* ECKD */
3473
3474         heads = basepriv->rdc_data.trk_per_cyl;
3475         begcyl = trk / heads;
3476         beghead = trk % heads;
3477         endcyl = totrk / heads;
3478         endhead = totrk % heads;
3479
3480         /* check for sequential prestage - enhance cylinder range */
3481         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3482             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3483
3484                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3485                         endcyl += basepriv->attrib.nr_cyl;
3486                 else
3487                         endcyl = (basepriv->real_cyl - 1);
3488         }
3489
3490         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3491         set_ch_t(&dedata->end_ext, endcyl, endhead);
3492
3493         dedata->ep_format = 0x20; /* records per track is valid */
3494         dedata->ep_rec_per_track = blk_per_trk;
3495
3496         if (rec_on_trk) {
3497                 switch (basepriv->rdc_data.dev_type) {
3498                 case 0x3390:
3499                         dn = ceil_quot(blksize + 6, 232);
3500                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3501                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3502                         break;
3503                 case 0x3380:
3504                         d = 7 + ceil_quot(blksize + 12, 32);
3505                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3506                         break;
3507                 }
3508         }
3509
3510         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3511                 lredata->auxiliary.length_valid = 0;
3512                 lredata->auxiliary.length_scope = 0;
3513                 lredata->sector = 0xff;
3514         } else {
3515                 lredata->auxiliary.length_valid = 1;
3516                 lredata->auxiliary.length_scope = 1;
3517                 lredata->sector = sector;
3518         }
3519         lredata->auxiliary.imbedded_ccw_valid = 1;
3520         lredata->length = tlf;
3521         lredata->imbedded_ccw = cmd;
3522         lredata->count = count;
3523         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3524         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3525         lredata->search_arg.head = lredata->seek_addr.head;
3526         lredata->search_arg.record = rec_on_trk;
3527
3528         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3529                      &pfxdata, sizeof(pfxdata), total_data_size);
3530         return PTR_ERR_OR_ZERO(dcw);
3531 }
3532
3533 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3534                                                struct dasd_device *startdev,
3535                                                struct dasd_block *block,
3536                                                struct request *req,
3537                                                sector_t first_rec,
3538                                                sector_t last_rec,
3539                                                sector_t first_trk,
3540                                                sector_t last_trk,
3541                                                unsigned int first_offs,
3542                                                unsigned int last_offs,
3543                                                unsigned int blk_per_trk,
3544                                                unsigned int blksize)
3545 {
3546         struct dasd_ccw_req *cqr;
3547         struct req_iterator iter;
3548         struct bio_vec bv;
3549         char *dst;
3550         unsigned int trkcount, ctidaw;
3551         unsigned char cmd;
3552         struct dasd_device *basedev;
3553         unsigned int tlf;
3554         struct itcw *itcw;
3555         struct tidaw *last_tidaw = NULL;
3556         int itcw_op;
3557         size_t itcw_size;
3558         u8 tidaw_flags;
3559         unsigned int seg_len, part_len, len_to_track_end;
3560         unsigned char new_track;
3561         sector_t recid, trkid;
3562         unsigned int offs;
3563         unsigned int count, count_to_trk_end;
3564         int ret;
3565
3566         basedev = block->base;
3567         if (rq_data_dir(req) == READ) {
3568                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3569                 itcw_op = ITCW_OP_READ;
3570         } else if (rq_data_dir(req) == WRITE) {
3571                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3572                 itcw_op = ITCW_OP_WRITE;
3573         } else
3574                 return ERR_PTR(-EINVAL);
3575
3576         /* trackbased I/O needs address all memory via TIDAWs,
3577          * not just for 64 bit addresses. This allows us to map
3578          * each segment directly to one tidaw.
3579          * In the case of write requests, additional tidaws may
3580          * be needed when a segment crosses a track boundary.
3581          */
3582         trkcount = last_trk - first_trk + 1;
3583         ctidaw = 0;
3584         rq_for_each_segment(bv, req, iter) {
3585                 ++ctidaw;
3586         }
3587         if (rq_data_dir(req) == WRITE)
3588                 ctidaw += (last_trk - first_trk);
3589
3590         /* Allocate the ccw request. */
3591         itcw_size = itcw_calc_size(0, ctidaw, 0);
3592         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
3593                                    blk_mq_rq_to_pdu(req));
3594         if (IS_ERR(cqr))
3595                 return cqr;
3596
3597         /* transfer length factor: how many bytes to read from the last track */
3598         if (first_trk == last_trk)
3599                 tlf = last_offs - first_offs + 1;
3600         else
3601                 tlf = last_offs + 1;
3602         tlf *= blksize;
3603
3604         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3605         if (IS_ERR(itcw)) {
3606                 ret = -EINVAL;
3607                 goto out_error;
3608         }
3609         cqr->cpaddr = itcw_get_tcw(itcw);
3610         if (prepare_itcw(itcw, first_trk, last_trk,
3611                          cmd, basedev, startdev,
3612                          first_offs + 1,
3613                          trkcount, blksize,
3614                          (last_rec - first_rec + 1) * blksize,
3615                          tlf, blk_per_trk) == -EAGAIN) {
3616                 /* Clock not in sync and XRC is enabled.
3617                  * Try again later.
3618                  */
3619                 ret = -EAGAIN;
3620                 goto out_error;
3621         }
3622         len_to_track_end = 0;
3623         /*
3624          * A tidaw can address 4k of memory, but must not cross page boundaries
3625          * We can let the block layer handle this by setting
3626          * blk_queue_segment_boundary to page boundaries and
3627          * blk_max_segment_size to page size when setting up the request queue.
3628          * For write requests, a TIDAW must not cross track boundaries, because
3629          * we have to set the CBC flag on the last tidaw for each track.
3630          */
3631         if (rq_data_dir(req) == WRITE) {
3632                 new_track = 1;
3633                 recid = first_rec;
3634                 rq_for_each_segment(bv, req, iter) {
3635                         dst = page_address(bv.bv_page) + bv.bv_offset;
3636                         seg_len = bv.bv_len;
3637                         while (seg_len) {
3638                                 if (new_track) {
3639                                         trkid = recid;
3640                                         offs = sector_div(trkid, blk_per_trk);
3641                                         count_to_trk_end = blk_per_trk - offs;
3642                                         count = min((last_rec - recid + 1),
3643                                                     (sector_t)count_to_trk_end);
3644                                         len_to_track_end = count * blksize;
3645                                         recid += count;
3646                                         new_track = 0;
3647                                 }
3648                                 part_len = min(seg_len, len_to_track_end);
3649                                 seg_len -= part_len;
3650                                 len_to_track_end -= part_len;
3651                                 /* We need to end the tidaw at track end */
3652                                 if (!len_to_track_end) {
3653                                         new_track = 1;
3654                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3655                                 } else
3656                                         tidaw_flags = 0;
3657                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3658                                                             dst, part_len);
3659                                 if (IS_ERR(last_tidaw)) {
3660                                         ret = -EINVAL;
3661                                         goto out_error;
3662                                 }
3663                                 dst += part_len;
3664                         }
3665                 }
3666         } else {
3667                 rq_for_each_segment(bv, req, iter) {
3668                         dst = page_address(bv.bv_page) + bv.bv_offset;
3669                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3670                                                     dst, bv.bv_len);
3671                         if (IS_ERR(last_tidaw)) {
3672                                 ret = -EINVAL;
3673                                 goto out_error;
3674                         }
3675                 }
3676         }
3677         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3678         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3679         itcw_finalize(itcw);
3680
3681         if (blk_noretry_request(req) ||
3682             block->base->features & DASD_FEATURE_FAILFAST)
3683                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3684         cqr->cpmode = 1;
3685         cqr->startdev = startdev;
3686         cqr->memdev = startdev;
3687         cqr->block = block;
3688         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3689         cqr->lpm = dasd_path_get_ppm(startdev);
3690         cqr->retries = startdev->default_retries;
3691         cqr->buildclk = get_tod_clock();
3692         cqr->status = DASD_CQR_FILLED;
3693         return cqr;
3694 out_error:
3695         dasd_sfree_request(cqr, startdev);
3696         return ERR_PTR(ret);
3697 }
3698
3699 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3700                                                struct dasd_block *block,
3701                                                struct request *req)
3702 {
3703         int cmdrtd, cmdwtd;
3704         int use_prefix;
3705         int fcx_multitrack;
3706         struct dasd_eckd_private *private;
3707         struct dasd_device *basedev;
3708         sector_t first_rec, last_rec;
3709         sector_t first_trk, last_trk;
3710         unsigned int first_offs, last_offs;
3711         unsigned int blk_per_trk, blksize;
3712         int cdlspecial;
3713         unsigned int data_size;
3714         struct dasd_ccw_req *cqr;
3715
3716         basedev = block->base;
3717         private = basedev->private;
3718
3719         /* Calculate number of blocks/records per track. */
3720         blksize = block->bp_block;
3721         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3722         if (blk_per_trk == 0)
3723                 return ERR_PTR(-EINVAL);
3724         /* Calculate record id of first and last block. */
3725         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3726         first_offs = sector_div(first_trk, blk_per_trk);
3727         last_rec = last_trk =
3728                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3729         last_offs = sector_div(last_trk, blk_per_trk);
3730         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3731
3732         fcx_multitrack = private->features.feature[40] & 0x20;
3733         data_size = blk_rq_bytes(req);
3734         if (data_size % blksize)
3735                 return ERR_PTR(-EINVAL);
3736         /* tpm write request add CBC data on each track boundary */
3737         if (rq_data_dir(req) == WRITE)
3738                 data_size += (last_trk - first_trk) * 4;
3739
3740         /* is read track data and write track data in command mode supported? */
3741         cmdrtd = private->features.feature[9] & 0x20;
3742         cmdwtd = private->features.feature[12] & 0x40;
3743         use_prefix = private->features.feature[8] & 0x01;
3744
3745         cqr = NULL;
3746         if (cdlspecial || dasd_page_cache) {
3747                 /* do nothing, just fall through to the cmd mode single case */
3748         } else if ((data_size <= private->fcx_max_data)
3749                    && (fcx_multitrack || (first_trk == last_trk))) {
3750                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3751                                                     first_rec, last_rec,
3752                                                     first_trk, last_trk,
3753                                                     first_offs, last_offs,
3754                                                     blk_per_trk, blksize);
3755                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3756                     (PTR_ERR(cqr) != -ENOMEM))
3757                         cqr = NULL;
3758         } else if (use_prefix &&
3759                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3760                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3761                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3762                                                    first_rec, last_rec,
3763                                                    first_trk, last_trk,
3764                                                    first_offs, last_offs,
3765                                                    blk_per_trk, blksize);
3766                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3767                     (PTR_ERR(cqr) != -ENOMEM))
3768                         cqr = NULL;
3769         }
3770         if (!cqr)
3771                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3772                                                     first_rec, last_rec,
3773                                                     first_trk, last_trk,
3774                                                     first_offs, last_offs,
3775                                                     blk_per_trk, blksize);
3776         return cqr;
3777 }
3778
3779 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3780                                                    struct dasd_block *block,
3781                                                    struct request *req)
3782 {
3783         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3784         unsigned int seg_len, len_to_track_end;
3785         unsigned int cidaw, cplength, datasize;
3786         sector_t first_trk, last_trk, sectors;
3787         struct dasd_eckd_private *base_priv;
3788         struct dasd_device *basedev;
3789         struct req_iterator iter;
3790         struct dasd_ccw_req *cqr;
3791         unsigned int trkcount;
3792         unsigned long *idaws;
3793         unsigned int size;
3794         unsigned char cmd;
3795         struct bio_vec bv;
3796         struct ccw1 *ccw;
3797         int use_prefix;
3798         void *data;
3799         char *dst;
3800
3801         /*
3802          * raw track access needs to be mutiple of 64k and on 64k boundary
3803          * For read requests we can fix an incorrect alignment by padding
3804          * the request with dummy pages.
3805          */
3806         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3807         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3808                 DASD_RAW_SECTORS_PER_TRACK;
3809         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3810                 DASD_RAW_SECTORS_PER_TRACK;
3811         basedev = block->base;
3812         if ((start_padding_sectors || end_padding_sectors) &&
3813             (rq_data_dir(req) == WRITE)) {
3814                 DBF_DEV_EVENT(DBF_ERR, basedev,
3815                               "raw write not track aligned (%lu,%lu) req %p",
3816                               start_padding_sectors, end_padding_sectors, req);
3817                 return ERR_PTR(-EINVAL);
3818         }
3819
3820         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3821         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3822                 DASD_RAW_SECTORS_PER_TRACK;
3823         trkcount = last_trk - first_trk + 1;
3824
3825         if (rq_data_dir(req) == READ)
3826                 cmd = DASD_ECKD_CCW_READ_TRACK;
3827         else if (rq_data_dir(req) == WRITE)
3828                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3829         else
3830                 return ERR_PTR(-EINVAL);
3831
3832         /*
3833          * Raw track based I/O needs IDAWs for each page,
3834          * and not just for 64 bit addresses.
3835          */
3836         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3837
3838         /*
3839          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3840          * of extended parameter. This is needed for write full track.
3841          */
3842         base_priv = basedev->private;
3843         use_prefix = base_priv->features.feature[8] & 0x01;
3844         if (use_prefix) {
3845                 cplength = 1 + trkcount;
3846                 size = sizeof(struct PFX_eckd_data) + 2;
3847         } else {
3848                 cplength = 2 + trkcount;
3849                 size = sizeof(struct DE_eckd_data) +
3850                         sizeof(struct LRE_eckd_data) + 2;
3851         }
3852         size = ALIGN(size, 8);
3853
3854         datasize = size + cidaw * sizeof(unsigned long);
3855
3856         /* Allocate the ccw request. */
3857         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3858                                    datasize, startdev, blk_mq_rq_to_pdu(req));
3859         if (IS_ERR(cqr))
3860                 return cqr;
3861
3862         ccw = cqr->cpaddr;
3863         data = cqr->data;
3864
3865         if (use_prefix) {
3866                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3867                            startdev, 1, 0, trkcount, 0, 0);
3868         } else {
3869                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3870                 ccw[-1].flags |= CCW_FLAG_CC;
3871
3872                 data += sizeof(struct DE_eckd_data);
3873                 locate_record_ext(ccw++, data, first_trk, 0,
3874                                   trkcount, cmd, basedev, 0, 0);
3875         }
3876
3877         idaws = (unsigned long *)(cqr->data + size);
3878         len_to_track_end = 0;
3879         if (start_padding_sectors) {
3880                 ccw[-1].flags |= CCW_FLAG_CC;
3881                 ccw->cmd_code = cmd;
3882                 /* maximum 3390 track size */
3883                 ccw->count = 57326;
3884                 /* 64k map to one track */
3885                 len_to_track_end = 65536 - start_padding_sectors * 512;
3886                 ccw->cda = (__u32)(addr_t)idaws;
3887                 ccw->flags |= CCW_FLAG_IDA;
3888                 ccw->flags |= CCW_FLAG_SLI;
3889                 ccw++;
3890                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3891                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3892         }
3893         rq_for_each_segment(bv, req, iter) {
3894                 dst = page_address(bv.bv_page) + bv.bv_offset;
3895                 seg_len = bv.bv_len;
3896                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3897                         memset(dst, 0, seg_len);
3898                 if (!len_to_track_end) {
3899                         ccw[-1].flags |= CCW_FLAG_CC;
3900                         ccw->cmd_code = cmd;
3901                         /* maximum 3390 track size */
3902                         ccw->count = 57326;
3903                         /* 64k map to one track */
3904                         len_to_track_end = 65536;
3905                         ccw->cda = (__u32)(addr_t)idaws;
3906                         ccw->flags |= CCW_FLAG_IDA;
3907                         ccw->flags |= CCW_FLAG_SLI;
3908                         ccw++;
3909                 }
3910                 len_to_track_end -= seg_len;
3911                 idaws = idal_create_words(idaws, dst, seg_len);
3912         }
3913         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3914                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3915         if (blk_noretry_request(req) ||
3916             block->base->features & DASD_FEATURE_FAILFAST)
3917                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3918         cqr->startdev = startdev;
3919         cqr->memdev = startdev;
3920         cqr->block = block;
3921         cqr->expires = startdev->default_expires * HZ;
3922         cqr->lpm = dasd_path_get_ppm(startdev);
3923         cqr->retries = startdev->default_retries;
3924         cqr->buildclk = get_tod_clock();
3925         cqr->status = DASD_CQR_FILLED;
3926
3927         return cqr;
3928 }
3929
3930
3931 static int
3932 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3933 {
3934         struct dasd_eckd_private *private;
3935         struct ccw1 *ccw;
3936         struct req_iterator iter;
3937         struct bio_vec bv;
3938         char *dst, *cda;
3939         unsigned int blksize, blk_per_trk, off;
3940         sector_t recid;
3941         int status;
3942
3943         if (!dasd_page_cache)
3944                 goto out;
3945         private = cqr->block->base->private;
3946         blksize = cqr->block->bp_block;
3947         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3948         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3949         ccw = cqr->cpaddr;
3950         /* Skip over define extent & locate record. */
3951         ccw++;
3952         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3953                 ccw++;
3954         rq_for_each_segment(bv, req, iter) {
3955                 dst = page_address(bv.bv_page) + bv.bv_offset;
3956                 for (off = 0; off < bv.bv_len; off += blksize) {
3957                         /* Skip locate record. */
3958                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3959                                 ccw++;
3960                         if (dst) {
3961                                 if (ccw->flags & CCW_FLAG_IDA)
3962                                         cda = *((char **)((addr_t) ccw->cda));
3963                                 else
3964                                         cda = (char *)((addr_t) ccw->cda);
3965                                 if (dst != cda) {
3966                                         if (rq_data_dir(req) == READ)
3967                                                 memcpy(dst, cda, bv.bv_len);
3968                                         kmem_cache_free(dasd_page_cache,
3969                                             (void *)((addr_t)cda & PAGE_MASK));
3970                                 }
3971                                 dst = NULL;
3972                         }
3973                         ccw++;
3974                         recid++;
3975                 }
3976         }
3977 out:
3978         status = cqr->status == DASD_CQR_DONE;
3979         dasd_sfree_request(cqr, cqr->memdev);
3980         return status;
3981 }
3982
3983 /*
3984  * Modify ccw/tcw in cqr so it can be started on a base device.
3985  *
3986  * Note that this is not enough to restart the cqr!
3987  * Either reset cqr->startdev as well (summary unit check handling)
3988  * or restart via separate cqr (as in ERP handling).
3989  */
3990 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3991 {
3992         struct ccw1 *ccw;
3993         struct PFX_eckd_data *pfxdata;
3994         struct tcw *tcw;
3995         struct tccb *tccb;
3996         struct dcw *dcw;
3997
3998         if (cqr->cpmode == 1) {
3999                 tcw = cqr->cpaddr;
4000                 tccb = tcw_get_tccb(tcw);
4001                 dcw = (struct dcw *)&tccb->tca[0];
4002                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4003                 pfxdata->validity.verify_base = 0;
4004                 pfxdata->validity.hyper_pav = 0;
4005         } else {
4006                 ccw = cqr->cpaddr;
4007                 pfxdata = cqr->data;
4008                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4009                         pfxdata->validity.verify_base = 0;
4010                         pfxdata->validity.hyper_pav = 0;
4011                 }
4012         }
4013 }
4014
4015 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4016
4017 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4018                                                      struct dasd_block *block,
4019                                                      struct request *req)
4020 {
4021         struct dasd_eckd_private *private;
4022         struct dasd_device *startdev;
4023         unsigned long flags;
4024         struct dasd_ccw_req *cqr;
4025
4026         startdev = dasd_alias_get_start_dev(base);
4027         if (!startdev)
4028                 startdev = base;
4029         private = startdev->private;
4030         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4031                 return ERR_PTR(-EBUSY);
4032
4033         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4034         private->count++;
4035         if ((base->features & DASD_FEATURE_USERAW))
4036                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4037         else
4038                 cqr = dasd_eckd_build_cp(startdev, block, req);
4039         if (IS_ERR(cqr))
4040                 private->count--;
4041         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4042         return cqr;
4043 }
4044
4045 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4046                                    struct request *req)
4047 {
4048         struct dasd_eckd_private *private;
4049         unsigned long flags;
4050
4051         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4052         private = cqr->memdev->private;
4053         private->count--;
4054         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4055         return dasd_eckd_free_cp(cqr, req);
4056 }
4057
4058 static int
4059 dasd_eckd_fill_info(struct dasd_device * device,
4060                     struct dasd_information2_t * info)
4061 {
4062         struct dasd_eckd_private *private = device->private;
4063
4064         info->label_block = 2;
4065         info->FBA_layout = private->uses_cdl ? 0 : 1;
4066         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4067         info->characteristics_size = sizeof(private->rdc_data);
4068         memcpy(info->characteristics, &private->rdc_data,
4069                sizeof(private->rdc_data));
4070         info->confdata_size = min((unsigned long)private->conf_len,
4071                                   sizeof(info->configuration_data));
4072         memcpy(info->configuration_data, private->conf_data,
4073                info->confdata_size);
4074         return 0;
4075 }
4076
4077 /*
4078  * SECTION: ioctl functions for eckd devices.
4079  */
4080
4081 /*
4082  * Release device ioctl.
4083  * Buils a channel programm to releases a prior reserved
4084  * (see dasd_eckd_reserve) device.
4085  */
4086 static int
4087 dasd_eckd_release(struct dasd_device *device)
4088 {
4089         struct dasd_ccw_req *cqr;
4090         int rc;
4091         struct ccw1 *ccw;
4092         int useglobal;
4093
4094         if (!capable(CAP_SYS_ADMIN))
4095                 return -EACCES;
4096
4097         useglobal = 0;
4098         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4099         if (IS_ERR(cqr)) {
4100                 mutex_lock(&dasd_reserve_mutex);
4101                 useglobal = 1;
4102                 cqr = &dasd_reserve_req->cqr;
4103                 memset(cqr, 0, sizeof(*cqr));
4104                 memset(&dasd_reserve_req->ccw, 0,
4105                        sizeof(dasd_reserve_req->ccw));
4106                 cqr->cpaddr = &dasd_reserve_req->ccw;
4107                 cqr->data = &dasd_reserve_req->data;
4108                 cqr->magic = DASD_ECKD_MAGIC;
4109         }
4110         ccw = cqr->cpaddr;
4111         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4112         ccw->flags |= CCW_FLAG_SLI;
4113         ccw->count = 32;
4114         ccw->cda = (__u32)(addr_t) cqr->data;
4115         cqr->startdev = device;
4116         cqr->memdev = device;
4117         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4118         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4119         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4120         cqr->expires = 2 * HZ;
4121         cqr->buildclk = get_tod_clock();
4122         cqr->status = DASD_CQR_FILLED;
4123
4124         rc = dasd_sleep_on_immediatly(cqr);
4125         if (!rc)
4126                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4127
4128         if (useglobal)
4129                 mutex_unlock(&dasd_reserve_mutex);
4130         else
4131                 dasd_sfree_request(cqr, cqr->memdev);
4132         return rc;
4133 }
4134
4135 /*
4136  * Reserve device ioctl.
4137  * Options are set to 'synchronous wait for interrupt' and
4138  * 'timeout the request'. This leads to a terminate IO if
4139  * the interrupt is outstanding for a certain time.
4140  */
4141 static int
4142 dasd_eckd_reserve(struct dasd_device *device)
4143 {
4144         struct dasd_ccw_req *cqr;
4145         int rc;
4146         struct ccw1 *ccw;
4147         int useglobal;
4148
4149         if (!capable(CAP_SYS_ADMIN))
4150                 return -EACCES;
4151
4152         useglobal = 0;
4153         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4154         if (IS_ERR(cqr)) {
4155                 mutex_lock(&dasd_reserve_mutex);
4156                 useglobal = 1;
4157                 cqr = &dasd_reserve_req->cqr;
4158                 memset(cqr, 0, sizeof(*cqr));
4159                 memset(&dasd_reserve_req->ccw, 0,
4160                        sizeof(dasd_reserve_req->ccw));
4161                 cqr->cpaddr = &dasd_reserve_req->ccw;
4162                 cqr->data = &dasd_reserve_req->data;
4163                 cqr->magic = DASD_ECKD_MAGIC;
4164         }
4165         ccw = cqr->cpaddr;
4166         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4167         ccw->flags |= CCW_FLAG_SLI;
4168         ccw->count = 32;
4169         ccw->cda = (__u32)(addr_t) cqr->data;
4170         cqr->startdev = device;
4171         cqr->memdev = device;
4172         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4173         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4174         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4175         cqr->expires = 2 * HZ;
4176         cqr->buildclk = get_tod_clock();
4177         cqr->status = DASD_CQR_FILLED;
4178
4179         rc = dasd_sleep_on_immediatly(cqr);
4180         if (!rc)
4181                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4182
4183         if (useglobal)
4184                 mutex_unlock(&dasd_reserve_mutex);
4185         else
4186                 dasd_sfree_request(cqr, cqr->memdev);
4187         return rc;
4188 }
4189
4190 /*
4191  * Steal lock ioctl - unconditional reserve device.
4192  * Buils a channel programm to break a device's reservation.
4193  * (unconditional reserve)
4194  */
4195 static int
4196 dasd_eckd_steal_lock(struct dasd_device *device)
4197 {
4198         struct dasd_ccw_req *cqr;
4199         int rc;
4200         struct ccw1 *ccw;
4201         int useglobal;
4202
4203         if (!capable(CAP_SYS_ADMIN))
4204                 return -EACCES;
4205
4206         useglobal = 0;
4207         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4208         if (IS_ERR(cqr)) {
4209                 mutex_lock(&dasd_reserve_mutex);
4210                 useglobal = 1;
4211                 cqr = &dasd_reserve_req->cqr;
4212                 memset(cqr, 0, sizeof(*cqr));
4213                 memset(&dasd_reserve_req->ccw, 0,
4214                        sizeof(dasd_reserve_req->ccw));
4215                 cqr->cpaddr = &dasd_reserve_req->ccw;
4216                 cqr->data = &dasd_reserve_req->data;
4217                 cqr->magic = DASD_ECKD_MAGIC;
4218         }
4219         ccw = cqr->cpaddr;
4220         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4221         ccw->flags |= CCW_FLAG_SLI;
4222         ccw->count = 32;
4223         ccw->cda = (__u32)(addr_t) cqr->data;
4224         cqr->startdev = device;
4225         cqr->memdev = device;
4226         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4227         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4228         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4229         cqr->expires = 2 * HZ;
4230         cqr->buildclk = get_tod_clock();
4231         cqr->status = DASD_CQR_FILLED;
4232
4233         rc = dasd_sleep_on_immediatly(cqr);
4234         if (!rc)
4235                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4236
4237         if (useglobal)
4238                 mutex_unlock(&dasd_reserve_mutex);
4239         else
4240                 dasd_sfree_request(cqr, cqr->memdev);
4241         return rc;
4242 }
4243
4244 /*
4245  * SNID - Sense Path Group ID
4246  * This ioctl may be used in situations where I/O is stalled due to
4247  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4248  * preallocated dasd_reserve_req.
4249  */
4250 static int dasd_eckd_snid(struct dasd_device *device,
4251                           void __user *argp)
4252 {
4253         struct dasd_ccw_req *cqr;
4254         int rc;
4255         struct ccw1 *ccw;
4256         int useglobal;
4257         struct dasd_snid_ioctl_data usrparm;
4258
4259         if (!capable(CAP_SYS_ADMIN))
4260                 return -EACCES;
4261
4262         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4263                 return -EFAULT;
4264
4265         useglobal = 0;
4266         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4267                                    sizeof(struct dasd_snid_data), device,
4268                                    NULL);
4269         if (IS_ERR(cqr)) {
4270                 mutex_lock(&dasd_reserve_mutex);
4271                 useglobal = 1;
4272                 cqr = &dasd_reserve_req->cqr;
4273                 memset(cqr, 0, sizeof(*cqr));
4274                 memset(&dasd_reserve_req->ccw, 0,
4275                        sizeof(dasd_reserve_req->ccw));
4276                 cqr->cpaddr = &dasd_reserve_req->ccw;
4277                 cqr->data = &dasd_reserve_req->data;
4278                 cqr->magic = DASD_ECKD_MAGIC;
4279         }
4280         ccw = cqr->cpaddr;
4281         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4282         ccw->flags |= CCW_FLAG_SLI;
4283         ccw->count = 12;
4284         ccw->cda = (__u32)(addr_t) cqr->data;
4285         cqr->startdev = device;
4286         cqr->memdev = device;
4287         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4288         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4289         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4290         cqr->retries = 5;
4291         cqr->expires = 10 * HZ;
4292         cqr->buildclk = get_tod_clock();
4293         cqr->status = DASD_CQR_FILLED;
4294         cqr->lpm = usrparm.path_mask;
4295
4296         rc = dasd_sleep_on_immediatly(cqr);
4297         /* verify that I/O processing didn't modify the path mask */
4298         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4299                 rc = -EIO;
4300         if (!rc) {
4301                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4302                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4303                         rc = -EFAULT;
4304         }
4305
4306         if (useglobal)
4307                 mutex_unlock(&dasd_reserve_mutex);
4308         else
4309                 dasd_sfree_request(cqr, cqr->memdev);
4310         return rc;
4311 }
4312
4313 /*
4314  * Read performance statistics
4315  */
4316 static int
4317 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4318 {
4319         struct dasd_psf_prssd_data *prssdp;
4320         struct dasd_rssd_perf_stats_t *stats;
4321         struct dasd_ccw_req *cqr;
4322         struct ccw1 *ccw;
4323         int rc;
4324
4325         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4326                                    (sizeof(struct dasd_psf_prssd_data) +
4327                                     sizeof(struct dasd_rssd_perf_stats_t)),
4328                                    device, NULL);
4329         if (IS_ERR(cqr)) {
4330                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4331                             "Could not allocate initialization request");
4332                 return PTR_ERR(cqr);
4333         }
4334         cqr->startdev = device;
4335         cqr->memdev = device;
4336         cqr->retries = 0;
4337         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4338         cqr->expires = 10 * HZ;
4339
4340         /* Prepare for Read Subsystem Data */
4341         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4342         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4343         prssdp->order = PSF_ORDER_PRSSD;
4344         prssdp->suborder = 0x01;        /* Performance Statistics */
4345         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4346
4347         ccw = cqr->cpaddr;
4348         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4349         ccw->count = sizeof(struct dasd_psf_prssd_data);
4350         ccw->flags |= CCW_FLAG_CC;
4351         ccw->cda = (__u32)(addr_t) prssdp;
4352
4353         /* Read Subsystem Data - Performance Statistics */
4354         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4355         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4356
4357         ccw++;
4358         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4359         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4360         ccw->cda = (__u32)(addr_t) stats;
4361
4362         cqr->buildclk = get_tod_clock();
4363         cqr->status = DASD_CQR_FILLED;
4364         rc = dasd_sleep_on(cqr);
4365         if (rc == 0) {
4366                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4367                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4368                 if (copy_to_user(argp, stats,
4369                                  sizeof(struct dasd_rssd_perf_stats_t)))
4370                         rc = -EFAULT;
4371         }
4372         dasd_sfree_request(cqr, cqr->memdev);
4373         return rc;
4374 }
4375
4376 /*
4377  * Get attributes (cache operations)
4378  * Returnes the cache attributes used in Define Extend (DE).
4379  */
4380 static int
4381 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4382 {
4383         struct dasd_eckd_private *private = device->private;
4384         struct attrib_data_t attrib = private->attrib;
4385         int rc;
4386
4387         if (!capable(CAP_SYS_ADMIN))
4388                 return -EACCES;
4389         if (!argp)
4390                 return -EINVAL;
4391
4392         rc = 0;
4393         if (copy_to_user(argp, (long *) &attrib,
4394                          sizeof(struct attrib_data_t)))
4395                 rc = -EFAULT;
4396
4397         return rc;
4398 }
4399
4400 /*
4401  * Set attributes (cache operations)
4402  * Stores the attributes for cache operation to be used in Define Extend (DE).
4403  */
4404 static int
4405 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4406 {
4407         struct dasd_eckd_private *private = device->private;
4408         struct attrib_data_t attrib;
4409
4410         if (!capable(CAP_SYS_ADMIN))
4411                 return -EACCES;
4412         if (!argp)
4413                 return -EINVAL;
4414
4415         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4416                 return -EFAULT;
4417         private->attrib = attrib;
4418
4419         dev_info(&device->cdev->dev,
4420                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4421                  private->attrib.operation, private->attrib.nr_cyl);
4422         return 0;
4423 }
4424
4425 /*
4426  * Issue syscall I/O to EMC Symmetrix array.
4427  * CCWs are PSF and RSSD
4428  */
4429 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4430 {
4431         struct dasd_symmio_parms usrparm;
4432         char *psf_data, *rssd_result;
4433         struct dasd_ccw_req *cqr;
4434         struct ccw1 *ccw;
4435         char psf0, psf1;
4436         int rc;
4437
4438         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4439                 return -EACCES;
4440         psf0 = psf1 = 0;
4441
4442         /* Copy parms from caller */
4443         rc = -EFAULT;
4444         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4445                 goto out;
4446         if (is_compat_task()) {
4447                 /* Make sure pointers are sane even on 31 bit. */
4448                 rc = -EINVAL;
4449                 if ((usrparm.psf_data >> 32) != 0)
4450                         goto out;
4451                 if ((usrparm.rssd_result >> 32) != 0)
4452                         goto out;
4453                 usrparm.psf_data &= 0x7fffffffULL;
4454                 usrparm.rssd_result &= 0x7fffffffULL;
4455         }
4456         /* at least 2 bytes are accessed and should be allocated */
4457         if (usrparm.psf_data_len < 2) {
4458                 DBF_DEV_EVENT(DBF_WARNING, device,
4459                               "Symmetrix ioctl invalid data length %d",
4460                               usrparm.psf_data_len);
4461                 rc = -EINVAL;
4462                 goto out;
4463         }
4464         /* alloc I/O data area */
4465         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4466         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4467         if (!psf_data || !rssd_result) {
4468                 rc = -ENOMEM;
4469                 goto out_free;
4470         }
4471
4472         /* get syscall header from user space */
4473         rc = -EFAULT;
4474         if (copy_from_user(psf_data,
4475                            (void __user *)(unsigned long) usrparm.psf_data,
4476                            usrparm.psf_data_len))
4477                 goto out_free;
4478         psf0 = psf_data[0];
4479         psf1 = psf_data[1];
4480
4481         /* setup CCWs for PSF + RSSD */
4482         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
4483         if (IS_ERR(cqr)) {
4484                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4485                         "Could not allocate initialization request");
4486                 rc = PTR_ERR(cqr);
4487                 goto out_free;
4488         }
4489
4490         cqr->startdev = device;
4491         cqr->memdev = device;
4492         cqr->retries = 3;
4493         cqr->expires = 10 * HZ;
4494         cqr->buildclk = get_tod_clock();
4495         cqr->status = DASD_CQR_FILLED;
4496
4497         /* Build the ccws */
4498         ccw = cqr->cpaddr;
4499
4500         /* PSF ccw */
4501         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4502         ccw->count = usrparm.psf_data_len;
4503         ccw->flags |= CCW_FLAG_CC;
4504         ccw->cda = (__u32)(addr_t) psf_data;
4505
4506         ccw++;
4507
4508         /* RSSD ccw  */
4509         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4510         ccw->count = usrparm.rssd_result_len;
4511         ccw->flags = CCW_FLAG_SLI ;
4512         ccw->cda = (__u32)(addr_t) rssd_result;
4513
4514         rc = dasd_sleep_on(cqr);
4515         if (rc)
4516                 goto out_sfree;
4517
4518         rc = -EFAULT;
4519         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4520                            rssd_result, usrparm.rssd_result_len))
4521                 goto out_sfree;
4522         rc = 0;
4523
4524 out_sfree:
4525         dasd_sfree_request(cqr, cqr->memdev);
4526 out_free:
4527         kfree(rssd_result);
4528         kfree(psf_data);
4529 out:
4530         DBF_DEV_EVENT(DBF_WARNING, device,
4531                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4532                       (int) psf0, (int) psf1, rc);
4533         return rc;
4534 }
4535
4536 static int
4537 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4538 {
4539         struct dasd_device *device = block->base;
4540
4541         switch (cmd) {
4542         case BIODASDGATTR:
4543                 return dasd_eckd_get_attrib(device, argp);
4544         case BIODASDSATTR:
4545                 return dasd_eckd_set_attrib(device, argp);
4546         case BIODASDPSRD:
4547                 return dasd_eckd_performance(device, argp);
4548         case BIODASDRLSE:
4549                 return dasd_eckd_release(device);
4550         case BIODASDRSRV:
4551                 return dasd_eckd_reserve(device);
4552         case BIODASDSLCK:
4553                 return dasd_eckd_steal_lock(device);
4554         case BIODASDSNID:
4555                 return dasd_eckd_snid(device, argp);
4556         case BIODASDSYMMIO:
4557                 return dasd_symm_io(device, argp);
4558         default:
4559                 return -ENOTTY;
4560         }
4561 }
4562
4563 /*
4564  * Dump the range of CCWs into 'page' buffer
4565  * and return number of printed chars.
4566  */
4567 static int
4568 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4569 {
4570         int len, count;
4571         char *datap;
4572
4573         len = 0;
4574         while (from <= to) {
4575                 len += sprintf(page + len, PRINTK_HEADER
4576                                " CCW %p: %08X %08X DAT:",
4577                                from, ((int *) from)[0], ((int *) from)[1]);
4578
4579                 /* get pointer to data (consider IDALs) */
4580                 if (from->flags & CCW_FLAG_IDA)
4581                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4582                 else
4583                         datap = (char *) ((addr_t) from->cda);
4584
4585                 /* dump data (max 32 bytes) */
4586                 for (count = 0; count < from->count && count < 32; count++) {
4587                         if (count % 8 == 0) len += sprintf(page + len, " ");
4588                         if (count % 4 == 0) len += sprintf(page + len, " ");
4589                         len += sprintf(page + len, "%02x", datap[count]);
4590                 }
4591                 len += sprintf(page + len, "\n");
4592                 from++;
4593         }
4594         return len;
4595 }
4596
4597 static void
4598 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4599                          char *reason)
4600 {
4601         u64 *sense;
4602         u64 *stat;
4603
4604         sense = (u64 *) dasd_get_sense(irb);
4605         stat = (u64 *) &irb->scsw;
4606         if (sense) {
4607                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4608                               "%016llx %016llx %016llx %016llx",
4609                               reason, *stat, *((u32 *) (stat + 1)),
4610                               sense[0], sense[1], sense[2], sense[3]);
4611         } else {
4612                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4613                               reason, *stat, *((u32 *) (stat + 1)),
4614                               "NO VALID SENSE");
4615         }
4616 }
4617
4618 /*
4619  * Print sense data and related channel program.
4620  * Parts are printed because printk buffer is only 1024 bytes.
4621  */
4622 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4623                                  struct dasd_ccw_req *req, struct irb *irb)
4624 {
4625         char *page;
4626         struct ccw1 *first, *last, *fail, *from, *to;
4627         int len, sl, sct;
4628
4629         page = (char *) get_zeroed_page(GFP_ATOMIC);
4630         if (page == NULL) {
4631                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4632                               "No memory to dump sense data\n");
4633                 return;
4634         }
4635         /* dump the sense data */
4636         len = sprintf(page, PRINTK_HEADER
4637                       " I/O status report for device %s:\n",
4638                       dev_name(&device->cdev->dev));
4639         len += sprintf(page + len, PRINTK_HEADER
4640                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4641                        "CS:%02X RC:%d\n",
4642                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4643                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4644                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4645                        req ? req->intrc : 0);
4646         len += sprintf(page + len, PRINTK_HEADER
4647                        " device %s: Failing CCW: %p\n",
4648                        dev_name(&device->cdev->dev),
4649                        (void *) (addr_t) irb->scsw.cmd.cpa);
4650         if (irb->esw.esw0.erw.cons) {
4651                 for (sl = 0; sl < 4; sl++) {
4652                         len += sprintf(page + len, PRINTK_HEADER
4653                                        " Sense(hex) %2d-%2d:",
4654                                        (8 * sl), ((8 * sl) + 7));
4655
4656                         for (sct = 0; sct < 8; sct++) {
4657                                 len += sprintf(page + len, " %02x",
4658                                                irb->ecw[8 * sl + sct]);
4659                         }
4660                         len += sprintf(page + len, "\n");
4661                 }
4662
4663                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4664                         /* 24 Byte Sense Data */
4665                         sprintf(page + len, PRINTK_HEADER
4666                                 " 24 Byte: %x MSG %x, "
4667                                 "%s MSGb to SYSOP\n",
4668                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4669                                 irb->ecw[1] & 0x10 ? "" : "no");
4670                 } else {
4671                         /* 32 Byte Sense Data */
4672                         sprintf(page + len, PRINTK_HEADER
4673                                 " 32 Byte: Format: %x "
4674                                 "Exception class %x\n",
4675                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4676                 }
4677         } else {
4678                 sprintf(page + len, PRINTK_HEADER
4679                         " SORRY - NO VALID SENSE AVAILABLE\n");
4680         }
4681         printk(KERN_ERR "%s", page);
4682
4683         if (req) {
4684                 /* req == NULL for unsolicited interrupts */
4685                 /* dump the Channel Program (max 140 Bytes per line) */
4686                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4687                 first = req->cpaddr;
4688                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4689                 to = min(first + 6, last);
4690                 len = sprintf(page, PRINTK_HEADER
4691                               " Related CP in req: %p\n", req);
4692                 dasd_eckd_dump_ccw_range(first, to, page + len);
4693                 printk(KERN_ERR "%s", page);
4694
4695                 /* print failing CCW area (maximum 4) */
4696                 /* scsw->cda is either valid or zero  */
4697                 len = 0;
4698                 from = ++to;
4699                 fail = (struct ccw1 *)(addr_t)
4700                                 irb->scsw.cmd.cpa; /* failing CCW */
4701                 if (from <  fail - 2) {
4702                         from = fail - 2;     /* there is a gap - print header */
4703                         len += sprintf(page, PRINTK_HEADER "......\n");
4704                 }
4705                 to = min(fail + 1, last);
4706                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4707
4708                 /* print last CCWs (maximum 2) */
4709                 from = max(from, ++to);
4710                 if (from < last - 1) {
4711                         from = last - 1;     /* there is a gap - print header */
4712                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4713                 }
4714                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4715                 if (len > 0)
4716                         printk(KERN_ERR "%s", page);
4717         }
4718         free_page((unsigned long) page);
4719 }
4720
4721
4722 /*
4723  * Print sense data from a tcw.
4724  */
4725 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4726                                  struct dasd_ccw_req *req, struct irb *irb)
4727 {
4728         char *page;
4729         int len, sl, sct, residual;
4730         struct tsb *tsb;
4731         u8 *sense, *rcq;
4732
4733         page = (char *) get_zeroed_page(GFP_ATOMIC);
4734         if (page == NULL) {
4735                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4736                             "No memory to dump sense data");
4737                 return;
4738         }
4739         /* dump the sense data */
4740         len = sprintf(page, PRINTK_HEADER
4741                       " I/O status report for device %s:\n",
4742                       dev_name(&device->cdev->dev));
4743         len += sprintf(page + len, PRINTK_HEADER
4744                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4745                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4746                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4747                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4748                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4749                        irb->scsw.tm.fcxs,
4750                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4751                        req ? req->intrc : 0);
4752         len += sprintf(page + len, PRINTK_HEADER
4753                        " device %s: Failing TCW: %p\n",
4754                        dev_name(&device->cdev->dev),
4755                        (void *) (addr_t) irb->scsw.tm.tcw);
4756
4757         tsb = NULL;
4758         sense = NULL;
4759         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4760                 tsb = tcw_get_tsb(
4761                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4762
4763         if (tsb) {
4764                 len += sprintf(page + len, PRINTK_HEADER
4765                                " tsb->length %d\n", tsb->length);
4766                 len += sprintf(page + len, PRINTK_HEADER
4767                                " tsb->flags %x\n", tsb->flags);
4768                 len += sprintf(page + len, PRINTK_HEADER
4769                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4770                 len += sprintf(page + len, PRINTK_HEADER
4771                                " tsb->count %d\n", tsb->count);
4772                 residual = tsb->count - 28;
4773                 len += sprintf(page + len, PRINTK_HEADER
4774                                " residual %d\n", residual);
4775
4776                 switch (tsb->flags & 0x07) {
4777                 case 1: /* tsa_iostat */
4778                         len += sprintf(page + len, PRINTK_HEADER
4779                                " tsb->tsa.iostat.dev_time %d\n",
4780                                        tsb->tsa.iostat.dev_time);
4781                         len += sprintf(page + len, PRINTK_HEADER
4782                                " tsb->tsa.iostat.def_time %d\n",
4783                                        tsb->tsa.iostat.def_time);
4784                         len += sprintf(page + len, PRINTK_HEADER
4785                                " tsb->tsa.iostat.queue_time %d\n",
4786                                        tsb->tsa.iostat.queue_time);
4787                         len += sprintf(page + len, PRINTK_HEADER
4788                                " tsb->tsa.iostat.dev_busy_time %d\n",
4789                                        tsb->tsa.iostat.dev_busy_time);
4790                         len += sprintf(page + len, PRINTK_HEADER
4791                                " tsb->tsa.iostat.dev_act_time %d\n",
4792                                        tsb->tsa.iostat.dev_act_time);
4793                         sense = tsb->tsa.iostat.sense;
4794                         break;
4795                 case 2: /* ts_ddpc */
4796                         len += sprintf(page + len, PRINTK_HEADER
4797                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4798                         for (sl = 0; sl < 2; sl++) {
4799                                 len += sprintf(page + len, PRINTK_HEADER
4800                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4801                                                (8 * sl), ((8 * sl) + 7));
4802                                 rcq = tsb->tsa.ddpc.rcq;
4803                                 for (sct = 0; sct < 8; sct++) {
4804                                         len += sprintf(page + len, " %02x",
4805                                                        rcq[8 * sl + sct]);
4806                                 }
4807                                 len += sprintf(page + len, "\n");
4808                         }
4809                         sense = tsb->tsa.ddpc.sense;
4810                         break;
4811                 case 3: /* tsa_intrg */
4812                         len += sprintf(page + len, PRINTK_HEADER
4813                                       " tsb->tsa.intrg.: not supported yet\n");
4814                         break;
4815                 }
4816
4817                 if (sense) {
4818                         for (sl = 0; sl < 4; sl++) {
4819                                 len += sprintf(page + len, PRINTK_HEADER
4820                                                " Sense(hex) %2d-%2d:",
4821                                                (8 * sl), ((8 * sl) + 7));
4822                                 for (sct = 0; sct < 8; sct++) {
4823                                         len += sprintf(page + len, " %02x",
4824                                                        sense[8 * sl + sct]);
4825                                 }
4826                                 len += sprintf(page + len, "\n");
4827                         }
4828
4829                         if (sense[27] & DASD_SENSE_BIT_0) {
4830                                 /* 24 Byte Sense Data */
4831                                 sprintf(page + len, PRINTK_HEADER
4832                                         " 24 Byte: %x MSG %x, "
4833                                         "%s MSGb to SYSOP\n",
4834                                         sense[7] >> 4, sense[7] & 0x0f,
4835                                         sense[1] & 0x10 ? "" : "no");
4836                         } else {
4837                                 /* 32 Byte Sense Data */
4838                                 sprintf(page + len, PRINTK_HEADER
4839                                         " 32 Byte: Format: %x "
4840                                         "Exception class %x\n",
4841                                         sense[6] & 0x0f, sense[22] >> 4);
4842                         }
4843                 } else {
4844                         sprintf(page + len, PRINTK_HEADER
4845                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4846                 }
4847         } else {
4848                 sprintf(page + len, PRINTK_HEADER
4849                         " SORRY - NO TSB DATA AVAILABLE\n");
4850         }
4851         printk(KERN_ERR "%s", page);
4852         free_page((unsigned long) page);
4853 }
4854
4855 static void dasd_eckd_dump_sense(struct dasd_device *device,
4856                                  struct dasd_ccw_req *req, struct irb *irb)
4857 {
4858         u8 *sense = dasd_get_sense(irb);
4859
4860         if (scsw_is_tm(&irb->scsw)) {
4861                 /*
4862                  * In some cases the 'File Protected' or 'Incorrect Length'
4863                  * error might be expected and log messages shouldn't be written
4864                  * then. Check if the according suppress bit is set.
4865                  */
4866                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4867                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4868                         return;
4869                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4870                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4871                         return;
4872
4873                 dasd_eckd_dump_sense_tcw(device, req, irb);
4874         } else {
4875                 /*
4876                  * In some cases the 'Command Reject' or 'No Record Found'
4877                  * error might be expected and log messages shouldn't be
4878                  * written then. Check if the according suppress bit is set.
4879                  */
4880                 if (sense && sense[0] & SNS0_CMD_REJECT &&
4881                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4882                         return;
4883
4884                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4885                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4886                         return;
4887
4888                 dasd_eckd_dump_sense_ccw(device, req, irb);
4889         }
4890 }
4891
4892 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4893 {
4894         /*
4895          * the device should be disconnected from our LCU structure
4896          * on restore we will reconnect it and reread LCU specific
4897          * information like PAV support that might have changed
4898          */
4899         dasd_alias_remove_device(device);
4900         dasd_alias_disconnect_device_from_lcu(device);
4901
4902         return 0;
4903 }
4904
4905 static int dasd_eckd_restore_device(struct dasd_device *device)
4906 {
4907         struct dasd_eckd_private *private = device->private;
4908         struct dasd_eckd_characteristics temp_rdc_data;
4909         int rc;
4910         struct dasd_uid temp_uid;
4911         unsigned long flags;
4912         unsigned long cqr_flags = 0;
4913
4914         /* Read Configuration Data */
4915         rc = dasd_eckd_read_conf(device);
4916         if (rc) {
4917                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4918                                 "Read configuration data failed, rc=%d", rc);
4919                 goto out_err;
4920         }
4921
4922         dasd_eckd_get_uid(device, &temp_uid);
4923         /* Generate device unique id */
4924         rc = dasd_eckd_generate_uid(device);
4925         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4926         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4927                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4928                         "changed\n");
4929         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4930         if (rc)
4931                 goto out_err;
4932
4933         /* register lcu with alias handling, enable PAV if this is a new lcu */
4934         rc = dasd_alias_make_device_known_to_lcu(device);
4935         if (rc)
4936                 goto out_err;
4937
4938         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4939         dasd_eckd_validate_server(device, cqr_flags);
4940
4941         /* RE-Read Configuration Data */
4942         rc = dasd_eckd_read_conf(device);
4943         if (rc) {
4944                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4945                         "Read configuration data failed, rc=%d", rc);
4946                 goto out_err2;
4947         }
4948
4949         /* Read Feature Codes */
4950         dasd_eckd_read_features(device);
4951
4952         /* Read Device Characteristics */
4953         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4954                                          &temp_rdc_data, 64);
4955         if (rc) {
4956                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4957                                 "Read device characteristic failed, rc=%d", rc);
4958                 goto out_err2;
4959         }
4960         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4961         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4962         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4963
4964         /* add device to alias management */
4965         dasd_alias_add_device(device);
4966
4967         return 0;
4968
4969 out_err2:
4970         dasd_alias_disconnect_device_from_lcu(device);
4971 out_err:
4972         return -1;
4973 }
4974
4975 static int dasd_eckd_reload_device(struct dasd_device *device)
4976 {
4977         struct dasd_eckd_private *private = device->private;
4978         int rc, old_base;
4979         char print_uid[60];
4980         struct dasd_uid uid;
4981         unsigned long flags;
4982
4983         /*
4984          * remove device from alias handling to prevent new requests
4985          * from being scheduled on the wrong alias device
4986          */
4987         dasd_alias_remove_device(device);
4988
4989         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4990         old_base = private->uid.base_unit_addr;
4991         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4992
4993         /* Read Configuration Data */
4994         rc = dasd_eckd_read_conf(device);
4995         if (rc)
4996                 goto out_err;
4997
4998         rc = dasd_eckd_generate_uid(device);
4999         if (rc)
5000                 goto out_err;
5001         /*
5002          * update unit address configuration and
5003          * add device to alias management
5004          */
5005         dasd_alias_update_add_device(device);
5006
5007         dasd_eckd_get_uid(device, &uid);
5008
5009         if (old_base != uid.base_unit_addr) {
5010                 if (strlen(uid.vduit) > 0)
5011                         snprintf(print_uid, sizeof(print_uid),
5012                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5013                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5014                 else
5015                         snprintf(print_uid, sizeof(print_uid),
5016                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5017                                  uid.ssid, uid.base_unit_addr);
5018
5019                 dev_info(&device->cdev->dev,
5020                          "An Alias device was reassigned to a new base device "
5021                          "with UID: %s\n", print_uid);
5022         }
5023         return 0;
5024
5025 out_err:
5026         return -1;
5027 }
5028
5029 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5030                                          struct dasd_rssd_messages *messages,
5031                                          __u8 lpum)
5032 {
5033         struct dasd_rssd_messages *message_buf;
5034         struct dasd_psf_prssd_data *prssdp;
5035         struct dasd_ccw_req *cqr;
5036         struct ccw1 *ccw;
5037         int rc;
5038
5039         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5040                                    (sizeof(struct dasd_psf_prssd_data) +
5041                                     sizeof(struct dasd_rssd_messages)),
5042                                    device, NULL);
5043         if (IS_ERR(cqr)) {
5044                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5045                                 "Could not allocate read message buffer request");
5046                 return PTR_ERR(cqr);
5047         }
5048
5049         cqr->lpm = lpum;
5050 retry:
5051         cqr->startdev = device;
5052         cqr->memdev = device;
5053         cqr->block = NULL;
5054         cqr->expires = 10 * HZ;
5055         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5056         /* dasd_sleep_on_immediatly does not do complex error
5057          * recovery so clear erp flag and set retry counter to
5058          * do basic erp */
5059         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5060         cqr->retries = 256;
5061
5062         /* Prepare for Read Subsystem Data */
5063         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5064         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5065         prssdp->order = PSF_ORDER_PRSSD;
5066         prssdp->suborder = 0x03;        /* Message Buffer */
5067         /* all other bytes of prssdp must be zero */
5068
5069         ccw = cqr->cpaddr;
5070         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5071         ccw->count = sizeof(struct dasd_psf_prssd_data);
5072         ccw->flags |= CCW_FLAG_CC;
5073         ccw->flags |= CCW_FLAG_SLI;
5074         ccw->cda = (__u32)(addr_t) prssdp;
5075
5076         /* Read Subsystem Data - message buffer */
5077         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5078         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5079
5080         ccw++;
5081         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5082         ccw->count = sizeof(struct dasd_rssd_messages);
5083         ccw->flags |= CCW_FLAG_SLI;
5084         ccw->cda = (__u32)(addr_t) message_buf;
5085
5086         cqr->buildclk = get_tod_clock();
5087         cqr->status = DASD_CQR_FILLED;
5088         rc = dasd_sleep_on_immediatly(cqr);
5089         if (rc == 0) {
5090                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5091                 message_buf = (struct dasd_rssd_messages *)
5092                         (prssdp + 1);
5093                 memcpy(messages, message_buf,
5094                        sizeof(struct dasd_rssd_messages));
5095         } else if (cqr->lpm) {
5096                 /*
5097                  * on z/VM we might not be able to do I/O on the requested path
5098                  * but instead we get the required information on any path
5099                  * so retry with open path mask
5100                  */
5101                 cqr->lpm = 0;
5102                 goto retry;
5103         } else
5104                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5105                                 "Reading messages failed with rc=%d\n"
5106                                 , rc);
5107         dasd_sfree_request(cqr, cqr->memdev);
5108         return rc;
5109 }
5110
5111 static int dasd_eckd_query_host_access(struct dasd_device *device,
5112                                        struct dasd_psf_query_host_access *data)
5113 {
5114         struct dasd_eckd_private *private = device->private;
5115         struct dasd_psf_query_host_access *host_access;
5116         struct dasd_psf_prssd_data *prssdp;
5117         struct dasd_ccw_req *cqr;
5118         struct ccw1 *ccw;
5119         int rc;
5120
5121         /* not available for HYPER PAV alias devices */
5122         if (!device->block && private->lcu->pav == HYPER_PAV)
5123                 return -EOPNOTSUPP;
5124
5125         /* may not be supported by the storage server */
5126         if (!(private->features.feature[14] & 0x80))
5127                 return -EOPNOTSUPP;
5128
5129         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5130                                    sizeof(struct dasd_psf_prssd_data) + 1,
5131                                    device, NULL);
5132         if (IS_ERR(cqr)) {
5133                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5134                                 "Could not allocate read message buffer request");
5135                 return PTR_ERR(cqr);
5136         }
5137         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5138         if (!host_access) {
5139                 dasd_sfree_request(cqr, device);
5140                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5141                                 "Could not allocate host_access buffer");
5142                 return -ENOMEM;
5143         }
5144         cqr->startdev = device;
5145         cqr->memdev = device;
5146         cqr->block = NULL;
5147         cqr->retries = 256;
5148         cqr->expires = 10 * HZ;
5149
5150         /* Prepare for Read Subsystem Data */
5151         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5152         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5153         prssdp->order = PSF_ORDER_PRSSD;
5154         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5155         /* LSS and Volume that will be queried */
5156         prssdp->lss = private->ned->ID;
5157         prssdp->volume = private->ned->unit_addr;
5158         /* all other bytes of prssdp must be zero */
5159
5160         ccw = cqr->cpaddr;
5161         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5162         ccw->count = sizeof(struct dasd_psf_prssd_data);
5163         ccw->flags |= CCW_FLAG_CC;
5164         ccw->flags |= CCW_FLAG_SLI;
5165         ccw->cda = (__u32)(addr_t) prssdp;
5166
5167         /* Read Subsystem Data - query host access */
5168         ccw++;
5169         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5170         ccw->count = sizeof(struct dasd_psf_query_host_access);
5171         ccw->flags |= CCW_FLAG_SLI;
5172         ccw->cda = (__u32)(addr_t) host_access;
5173
5174         cqr->buildclk = get_tod_clock();
5175         cqr->status = DASD_CQR_FILLED;
5176         /* the command might not be supported, suppress error message */
5177         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5178         rc = dasd_sleep_on_interruptible(cqr);
5179         if (rc == 0) {
5180                 *data = *host_access;
5181         } else {
5182                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5183                                 "Reading host access data failed with rc=%d\n",
5184                                 rc);
5185                 rc = -EOPNOTSUPP;
5186         }
5187
5188         dasd_sfree_request(cqr, cqr->memdev);
5189         kfree(host_access);
5190         return rc;
5191 }
5192 /*
5193  * return number of grouped devices
5194  */
5195 static int dasd_eckd_host_access_count(struct dasd_device *device)
5196 {
5197         struct dasd_psf_query_host_access *access;
5198         struct dasd_ckd_path_group_entry *entry;
5199         struct dasd_ckd_host_information *info;
5200         int count = 0;
5201         int rc, i;
5202
5203         access = kzalloc(sizeof(*access), GFP_NOIO);
5204         if (!access) {
5205                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5206                                 "Could not allocate access buffer");
5207                 return -ENOMEM;
5208         }
5209         rc = dasd_eckd_query_host_access(device, access);
5210         if (rc) {
5211                 kfree(access);
5212                 return rc;
5213         }
5214
5215         info = (struct dasd_ckd_host_information *)
5216                 access->host_access_information;
5217         for (i = 0; i < info->entry_count; i++) {
5218                 entry = (struct dasd_ckd_path_group_entry *)
5219                         (info->entry + i * info->entry_size);
5220                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5221                         count++;
5222         }
5223
5224         kfree(access);
5225         return count;
5226 }
5227
5228 /*
5229  * write host access information to a sequential file
5230  */
5231 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5232 {
5233         struct dasd_psf_query_host_access *access;
5234         struct dasd_ckd_path_group_entry *entry;
5235         struct dasd_ckd_host_information *info;
5236         char sysplex[9] = "";
5237         int rc, i;
5238
5239         access = kzalloc(sizeof(*access), GFP_NOIO);
5240         if (!access) {
5241                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5242                                 "Could not allocate access buffer");
5243                 return -ENOMEM;
5244         }
5245         rc = dasd_eckd_query_host_access(device, access);
5246         if (rc) {
5247                 kfree(access);
5248                 return rc;
5249         }
5250
5251         info = (struct dasd_ckd_host_information *)
5252                 access->host_access_information;
5253         for (i = 0; i < info->entry_count; i++) {
5254                 entry = (struct dasd_ckd_path_group_entry *)
5255                         (info->entry + i * info->entry_size);
5256                 /* PGID */
5257                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
5258                 /* FLAGS */
5259                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5260                 /* SYSPLEX NAME */
5261                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5262                 EBCASC(sysplex, sizeof(sysplex));
5263                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5264                 /* SUPPORTED CYLINDER */
5265                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5266                 /* TIMESTAMP */
5267                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5268                            entry->timestamp);
5269         }
5270         kfree(access);
5271
5272         return 0;
5273 }
5274
5275 /*
5276  * Perform Subsystem Function - CUIR response
5277  */
5278 static int
5279 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5280                             __u32 message_id, __u8 lpum)
5281 {
5282         struct dasd_psf_cuir_response *psf_cuir;
5283         int pos = pathmask_to_pos(lpum);
5284         struct dasd_ccw_req *cqr;
5285         struct ccw1 *ccw;
5286         int rc;
5287
5288         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5289                                    sizeof(struct dasd_psf_cuir_response),
5290                                    device, NULL);
5291
5292         if (IS_ERR(cqr)) {
5293                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5294                            "Could not allocate PSF-CUIR request");
5295                 return PTR_ERR(cqr);
5296         }
5297
5298         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5299         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5300         psf_cuir->cc = response;
5301         psf_cuir->chpid = device->path[pos].chpid;
5302         psf_cuir->message_id = message_id;
5303         psf_cuir->cssid = device->path[pos].cssid;
5304         psf_cuir->ssid = device->path[pos].ssid;
5305         ccw = cqr->cpaddr;
5306         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5307         ccw->cda = (__u32)(addr_t)psf_cuir;
5308         ccw->flags = CCW_FLAG_SLI;
5309         ccw->count = sizeof(struct dasd_psf_cuir_response);
5310
5311         cqr->startdev = device;
5312         cqr->memdev = device;
5313         cqr->block = NULL;
5314         cqr->retries = 256;
5315         cqr->expires = 10*HZ;
5316         cqr->buildclk = get_tod_clock();
5317         cqr->status = DASD_CQR_FILLED;
5318         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5319
5320         rc = dasd_sleep_on(cqr);
5321
5322         dasd_sfree_request(cqr, cqr->memdev);
5323         return rc;
5324 }
5325
5326 /*
5327  * return configuration data that is referenced by record selector
5328  * if a record selector is specified or per default return the
5329  * conf_data pointer for the path specified by lpum
5330  */
5331 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5332                                                      __u8 lpum,
5333                                                      struct dasd_cuir_message *cuir)
5334 {
5335         struct dasd_conf_data *conf_data;
5336         int path, pos;
5337
5338         if (cuir->record_selector == 0)
5339                 goto out;
5340         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5341                 conf_data = device->path[pos].conf_data;
5342                 if (conf_data->gneq.record_selector ==
5343                     cuir->record_selector)
5344                         return conf_data;
5345         }
5346 out:
5347         return device->path[pathmask_to_pos(lpum)].conf_data;
5348 }
5349
5350 /*
5351  * This function determines the scope of a reconfiguration request by
5352  * analysing the path and device selection data provided in the CUIR request.
5353  * Returns a path mask containing CUIR affected paths for the give device.
5354  *
5355  * If the CUIR request does not contain the required information return the
5356  * path mask of the path the attention message for the CUIR request was reveived
5357  * on.
5358  */
5359 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5360                                 struct dasd_cuir_message *cuir)
5361 {
5362         struct dasd_conf_data *ref_conf_data;
5363         unsigned long bitmask = 0, mask = 0;
5364         struct dasd_conf_data *conf_data;
5365         unsigned int pos, path;
5366         char *ref_gneq, *gneq;
5367         char *ref_ned, *ned;
5368         int tbcpm = 0;
5369
5370         /* if CUIR request does not specify the scope use the path
5371            the attention message was presented on */
5372         if (!cuir->ned_map ||
5373             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5374                 return lpum;
5375
5376         /* get reference conf data */
5377         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5378         /* reference ned is determined by ned_map field */
5379         pos = 8 - ffs(cuir->ned_map);
5380         ref_ned = (char *)&ref_conf_data->neds[pos];
5381         ref_gneq = (char *)&ref_conf_data->gneq;
5382         /* transfer 24 bit neq_map to mask */
5383         mask = cuir->neq_map[2];
5384         mask |= cuir->neq_map[1] << 8;
5385         mask |= cuir->neq_map[0] << 16;
5386
5387         for (path = 0; path < 8; path++) {
5388                 /* initialise data per path */
5389                 bitmask = mask;
5390                 conf_data = device->path[path].conf_data;
5391                 pos = 8 - ffs(cuir->ned_map);
5392                 ned = (char *) &conf_data->neds[pos];
5393                 /* compare reference ned and per path ned */
5394                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5395                         continue;
5396                 gneq = (char *)&conf_data->gneq;
5397                 /* compare reference gneq and per_path gneq under
5398                    24 bit mask where mask bit 0 equals byte 7 of
5399                    the gneq and mask bit 24 equals byte 31 */
5400                 while (bitmask) {
5401                         pos = ffs(bitmask) - 1;
5402                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5403                             != 0)
5404                                 break;
5405                         clear_bit(pos, &bitmask);
5406                 }
5407                 if (bitmask)
5408                         continue;
5409                 /* device and path match the reference values
5410                    add path to CUIR scope */
5411                 tbcpm |= 0x80 >> path;
5412         }
5413         return tbcpm;
5414 }
5415
5416 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5417                                        unsigned long paths, int action)
5418 {
5419         int pos;
5420
5421         while (paths) {
5422                 /* get position of bit in mask */
5423                 pos = 8 - ffs(paths);
5424                 /* get channel path descriptor from this position */
5425                 if (action == CUIR_QUIESCE)
5426                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
5427                                 device->path[pos].cssid,
5428                                 device->path[pos].chpid);
5429                 else if (action == CUIR_RESUME)
5430                         pr_info("Path %x.%02x is back online after service on the storage server",
5431                                 device->path[pos].cssid,
5432                                 device->path[pos].chpid);
5433                 clear_bit(7 - pos, &paths);
5434         }
5435 }
5436
5437 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5438                                       struct dasd_cuir_message *cuir)
5439 {
5440         unsigned long tbcpm;
5441
5442         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5443         /* nothing to do if path is not in use */
5444         if (!(dasd_path_get_opm(device) & tbcpm))
5445                 return 0;
5446         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5447                 /* no path would be left if the CUIR action is taken
5448                    return error */
5449                 return -EINVAL;
5450         }
5451         /* remove device from operational path mask */
5452         dasd_path_remove_opm(device, tbcpm);
5453         dasd_path_add_cuirpm(device, tbcpm);
5454         return tbcpm;
5455 }
5456
5457 /*
5458  * walk through all devices and build a path mask to quiesce them
5459  * return an error if the last path to a device would be removed
5460  *
5461  * if only part of the devices are quiesced and an error
5462  * occurs no onlining necessary, the storage server will
5463  * notify the already set offline devices again
5464  */
5465 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5466                                   struct dasd_cuir_message *cuir)
5467 {
5468         struct dasd_eckd_private *private = device->private;
5469         struct alias_pav_group *pavgroup, *tempgroup;
5470         struct dasd_device *dev, *n;
5471         unsigned long paths = 0;
5472         unsigned long flags;
5473         int tbcpm;
5474
5475         /* active devices */
5476         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5477                                  alias_list) {
5478                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5479                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5480                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5481                 if (tbcpm < 0)
5482                         goto out_err;
5483                 paths |= tbcpm;
5484         }
5485         /* inactive devices */
5486         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5487                                  alias_list) {
5488                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5489                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5490                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5491                 if (tbcpm < 0)
5492                         goto out_err;
5493                 paths |= tbcpm;
5494         }
5495         /* devices in PAV groups */
5496         list_for_each_entry_safe(pavgroup, tempgroup,
5497                                  &private->lcu->grouplist, group) {
5498                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5499                                          alias_list) {
5500                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5501                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5502                         spin_unlock_irqrestore(
5503                                 get_ccwdev_lock(dev->cdev), flags);
5504                         if (tbcpm < 0)
5505                                 goto out_err;
5506                         paths |= tbcpm;
5507                 }
5508                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5509                                          alias_list) {
5510                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5511                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5512                         spin_unlock_irqrestore(
5513                                 get_ccwdev_lock(dev->cdev), flags);
5514                         if (tbcpm < 0)
5515                                 goto out_err;
5516                         paths |= tbcpm;
5517                 }
5518         }
5519         /* notify user about all paths affected by CUIR action */
5520         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5521         return 0;
5522 out_err:
5523         return tbcpm;
5524 }
5525
5526 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5527                                  struct dasd_cuir_message *cuir)
5528 {
5529         struct dasd_eckd_private *private = device->private;
5530         struct alias_pav_group *pavgroup, *tempgroup;
5531         struct dasd_device *dev, *n;
5532         unsigned long paths = 0;
5533         int tbcpm;
5534
5535         /*
5536          * the path may have been added through a generic path event before
5537          * only trigger path verification if the path is not already in use
5538          */
5539         list_for_each_entry_safe(dev, n,
5540                                  &private->lcu->active_devices,
5541                                  alias_list) {
5542                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5543                 paths |= tbcpm;
5544                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5545                         dasd_path_add_tbvpm(dev, tbcpm);
5546                         dasd_schedule_device_bh(dev);
5547                 }
5548         }
5549         list_for_each_entry_safe(dev, n,
5550                                  &private->lcu->inactive_devices,
5551                                  alias_list) {
5552                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5553                 paths |= tbcpm;
5554                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5555                         dasd_path_add_tbvpm(dev, tbcpm);
5556                         dasd_schedule_device_bh(dev);
5557                 }
5558         }
5559         /* devices in PAV groups */
5560         list_for_each_entry_safe(pavgroup, tempgroup,
5561                                  &private->lcu->grouplist,
5562                                  group) {
5563                 list_for_each_entry_safe(dev, n,
5564                                          &pavgroup->baselist,
5565                                          alias_list) {
5566                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5567                         paths |= tbcpm;
5568                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5569                                 dasd_path_add_tbvpm(dev, tbcpm);
5570                                 dasd_schedule_device_bh(dev);
5571                         }
5572                 }
5573                 list_for_each_entry_safe(dev, n,
5574                                          &pavgroup->aliaslist,
5575                                          alias_list) {
5576                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5577                         paths |= tbcpm;
5578                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5579                                 dasd_path_add_tbvpm(dev, tbcpm);
5580                                 dasd_schedule_device_bh(dev);
5581                         }
5582                 }
5583         }
5584         /* notify user about all paths affected by CUIR action */
5585         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5586         return 0;
5587 }
5588
5589 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5590                                  __u8 lpum)
5591 {
5592         struct dasd_cuir_message *cuir = messages;
5593         int response;
5594
5595         DBF_DEV_EVENT(DBF_WARNING, device,
5596                       "CUIR request: %016llx %016llx %016llx %08x",
5597                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5598                       ((u32 *)cuir)[3]);
5599
5600         if (cuir->code == CUIR_QUIESCE) {
5601                 /* quiesce */
5602                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5603                         response = PSF_CUIR_LAST_PATH;
5604                 else
5605                         response = PSF_CUIR_COMPLETED;
5606         } else if (cuir->code == CUIR_RESUME) {
5607                 /* resume */
5608                 dasd_eckd_cuir_resume(device, lpum, cuir);
5609                 response = PSF_CUIR_COMPLETED;
5610         } else
5611                 response = PSF_CUIR_NOT_SUPPORTED;
5612
5613         dasd_eckd_psf_cuir_response(device, response,
5614                                     cuir->message_id, lpum);
5615         DBF_DEV_EVENT(DBF_WARNING, device,
5616                       "CUIR response: %d on message ID %08x", response,
5617                       cuir->message_id);
5618         /* to make sure there is no attention left schedule work again */
5619         device->discipline->check_attention(device, lpum);
5620 }
5621
5622 static void dasd_eckd_check_attention_work(struct work_struct *work)
5623 {
5624         struct check_attention_work_data *data;
5625         struct dasd_rssd_messages *messages;
5626         struct dasd_device *device;
5627         int rc;
5628
5629         data = container_of(work, struct check_attention_work_data, worker);
5630         device = data->device;
5631         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5632         if (!messages) {
5633                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5634                               "Could not allocate attention message buffer");
5635                 goto out;
5636         }
5637         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5638         if (rc)
5639                 goto out;
5640         if (messages->length == ATTENTION_LENGTH_CUIR &&
5641             messages->format == ATTENTION_FORMAT_CUIR)
5642                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5643 out:
5644         dasd_put_device(device);
5645         kfree(messages);
5646         kfree(data);
5647 }
5648
5649 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5650 {
5651         struct check_attention_work_data *data;
5652
5653         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5654         if (!data)
5655                 return -ENOMEM;
5656         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5657         dasd_get_device(device);
5658         data->device = device;
5659         data->lpum = lpum;
5660         schedule_work(&data->worker);
5661         return 0;
5662 }
5663
5664 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5665 {
5666         if (~lpum & dasd_path_get_opm(device)) {
5667                 dasd_path_add_nohpfpm(device, lpum);
5668                 dasd_path_remove_opm(device, lpum);
5669                 dev_err(&device->cdev->dev,
5670                         "Channel path %02X lost HPF functionality and is disabled\n",
5671                         lpum);
5672                 return 1;
5673         }
5674         return 0;
5675 }
5676
5677 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5678 {
5679         struct dasd_eckd_private *private = device->private;
5680
5681         dev_err(&device->cdev->dev,
5682                 "High Performance FICON disabled\n");
5683         private->fcx_max_data = 0;
5684 }
5685
5686 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5687 {
5688         struct dasd_eckd_private *private = device->private;
5689
5690         return private->fcx_max_data ? 1 : 0;
5691 }
5692
5693 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5694                                        struct irb *irb)
5695 {
5696         struct dasd_eckd_private *private = device->private;
5697
5698         if (!private->fcx_max_data) {
5699                 /* sanity check for no HPF, the error makes no sense */
5700                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5701                               "Trying to disable HPF for a non HPF device");
5702                 return;
5703         }
5704         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5705                 dasd_eckd_disable_hpf_device(device);
5706         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5707                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5708                         return;
5709                 dasd_eckd_disable_hpf_device(device);
5710                 dasd_path_set_tbvpm(device,
5711                                   dasd_path_get_hpfpm(device));
5712         }
5713         /*
5714          * prevent that any new I/O ist started on the device and schedule a
5715          * requeue of existing requests
5716          */
5717         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5718         dasd_schedule_requeue(device);
5719 }
5720
5721 static struct ccw_driver dasd_eckd_driver = {
5722         .driver = {
5723                 .name   = "dasd-eckd",
5724                 .owner  = THIS_MODULE,
5725         },
5726         .ids         = dasd_eckd_ids,
5727         .probe       = dasd_eckd_probe,
5728         .remove      = dasd_generic_remove,
5729         .set_offline = dasd_generic_set_offline,
5730         .set_online  = dasd_eckd_set_online,
5731         .notify      = dasd_generic_notify,
5732         .path_event  = dasd_generic_path_event,
5733         .shutdown    = dasd_generic_shutdown,
5734         .freeze      = dasd_generic_pm_freeze,
5735         .thaw        = dasd_generic_restore_device,
5736         .restore     = dasd_generic_restore_device,
5737         .uc_handler  = dasd_generic_uc_handler,
5738         .int_class   = IRQIO_DAS,
5739 };
5740
5741 /*
5742  * max_blocks is dependent on the amount of storage that is available
5743  * in the static io buffer for each device. Currently each device has
5744  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5745  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5746  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5747  * addition we have one define extent ccw + 16 bytes of data and one
5748  * locate record ccw + 16 bytes of data. That makes:
5749  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5750  * We want to fit two into the available memory so that we can immediately
5751  * start the next request if one finishes off. That makes 249.5 blocks
5752  * for one request. Give a little safety and the result is 240.
5753  */
5754 static struct dasd_discipline dasd_eckd_discipline = {
5755         .owner = THIS_MODULE,
5756         .name = "ECKD",
5757         .ebcname = "ECKD",
5758         .max_blocks = 190,
5759         .check_device = dasd_eckd_check_characteristics,
5760         .uncheck_device = dasd_eckd_uncheck_device,
5761         .do_analysis = dasd_eckd_do_analysis,
5762         .verify_path = dasd_eckd_verify_path,
5763         .basic_to_ready = dasd_eckd_basic_to_ready,
5764         .online_to_ready = dasd_eckd_online_to_ready,
5765         .basic_to_known = dasd_eckd_basic_to_known,
5766         .fill_geometry = dasd_eckd_fill_geometry,
5767         .start_IO = dasd_start_IO,
5768         .term_IO = dasd_term_IO,
5769         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5770         .format_device = dasd_eckd_format_device,
5771         .check_device_format = dasd_eckd_check_device_format,
5772         .erp_action = dasd_eckd_erp_action,
5773         .erp_postaction = dasd_eckd_erp_postaction,
5774         .check_for_device_change = dasd_eckd_check_for_device_change,
5775         .build_cp = dasd_eckd_build_alias_cp,
5776         .free_cp = dasd_eckd_free_alias_cp,
5777         .dump_sense = dasd_eckd_dump_sense,
5778         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5779         .fill_info = dasd_eckd_fill_info,
5780         .ioctl = dasd_eckd_ioctl,
5781         .freeze = dasd_eckd_pm_freeze,
5782         .restore = dasd_eckd_restore_device,
5783         .reload = dasd_eckd_reload_device,
5784         .get_uid = dasd_eckd_get_uid,
5785         .kick_validate = dasd_eckd_kick_validate_server,
5786         .check_attention = dasd_eckd_check_attention,
5787         .host_access_count = dasd_eckd_host_access_count,
5788         .hosts_print = dasd_hosts_print,
5789         .handle_hpf_error = dasd_eckd_handle_hpf_error,
5790         .disable_hpf = dasd_eckd_disable_hpf_device,
5791         .hpf_enabled = dasd_eckd_hpf_enabled,
5792         .reset_path = dasd_eckd_reset_path,
5793 };
5794
5795 static int __init
5796 dasd_eckd_init(void)
5797 {
5798         int ret;
5799
5800         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5801         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5802                                    GFP_KERNEL | GFP_DMA);
5803         if (!dasd_reserve_req)
5804                 return -ENOMEM;
5805         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5806                                    GFP_KERNEL | GFP_DMA);
5807         if (!path_verification_worker) {
5808                 kfree(dasd_reserve_req);
5809                 return -ENOMEM;
5810         }
5811         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5812         if (!rawpadpage) {
5813                 kfree(path_verification_worker);
5814                 kfree(dasd_reserve_req);
5815                 return -ENOMEM;
5816         }
5817         ret = ccw_driver_register(&dasd_eckd_driver);
5818         if (!ret)
5819                 wait_for_device_probe();
5820         else {
5821                 kfree(path_verification_worker);
5822                 kfree(dasd_reserve_req);
5823                 free_page((unsigned long)rawpadpage);
5824         }
5825         return ret;
5826 }
5827
5828 static void __exit
5829 dasd_eckd_cleanup(void)
5830 {
5831         ccw_driver_unregister(&dasd_eckd_driver);
5832         kfree(path_verification_worker);
5833         kfree(dasd_reserve_req);
5834         free_page((unsigned long)rawpadpage);
5835 }
5836
5837 module_init(dasd_eckd_init);
5838 module_exit(dasd_eckd_cleanup);