drivers/s390/block/dasd_devmap.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999,2001
   8  *
   9  * Device mapping and dasd= parameter parsing functions. All devmap
  10  * functions may not be called from interrupt context. In particular
  11  * dasd_get_device is a no-no from interrupt context.
  12  *
  13  */
  14
  15 #define KMSG_COMPONENT "dasd"
  16
  17 #include <linux/ctype.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/ipl.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_devmap:"
  28 #define DASD_BUS_ID_SIZE 20
  29
  30 #include "dasd_int.h"
  31
  32 struct kmem_cache *dasd_page_cache;
  33 EXPORT_SYMBOL_GPL(dasd_page_cache);
  34
  35 /*
  36  * dasd_devmap_t is used to store the features and the relation
  37  * between device number and device index. To find a dasd_devmap_t
  38  * that corresponds to a device number of a device index each
  39  * dasd_devmap_t is added to two linked lists, one to search by
  40  * the device number and one to search by the device index. As
  41  * soon as big minor numbers are available the device index list
  42  * can be removed since the device number will then be identical
  43  * to the device index.
  44  */
  45 struct dasd_devmap {
  46         struct list_head list;
  47         char bus_id[DASD_BUS_ID_SIZE];
  48         unsigned int devindex;
  49         unsigned short features;
  50         struct dasd_device *device;
  51 };
  52
  53 /*
  54  * Parameter parsing functions for dasd= parameter. The syntax is:
  55  *   <devno>            : (0x)?[0-9a-fA-F]+
  56  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  57  *   <feature>          : ro
  58  *   <feature_list>     : \(<feature>(:<feature>)*\)
  59  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  60  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  61  *   <devices>          : <devno-range>|<busid-range>
  62  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  63  *
  64  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  65  */
  66
  67 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  68 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  69 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  70 EXPORT_SYMBOL_GPL(dasd_nopav);
  71 int dasd_nofcx;                 /* disable High Performance Ficon */
  72 EXPORT_SYMBOL_GPL(dasd_nofcx);
  73
  74 /*
  75  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  76  * it is named 'dasd' to directly be filled by insmod with the comma separated
  77  * strings when running as a module.
  78  */
  79 static char *dasd[256];
  80 module_param_array(dasd, charp, NULL, S_IRUGO);
  81
  82 /*
  83  * Single spinlock to protect devmap and servermap structures and lists.
  84  */
  85 static DEFINE_SPINLOCK(dasd_devmap_lock);
  86
  87 /*
  88  * Hash lists for devmap structures.
  89  */
  90 static struct list_head dasd_hashlists[256];
  91 int dasd_max_devindex;
  92
  93 static struct dasd_devmap *dasd_add_busid(const char *, int);
  94
  95 static inline int
  96 dasd_hash_busid(const char *bus_id)
  97 {
  98         int hash, i;
  99
 100         hash = 0;
 101         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 102                 hash += *bus_id;
 103         return hash & 0xff;
 104 }
 105
 106 #ifndef MODULE
 107 /*
 108  * The parameter parsing functions for builtin-drivers are called
 109  * before kmalloc works. Store the pointers to the parameters strings
 110  * into dasd[] for later processing.
 111  */
 112 static int __init
 113 dasd_call_setup(char *str)
 114 {
 115         static int count = 0;
 116
 117         if (count < 256)
 118                 dasd[count++] = str;
 119         return 1;
 120 }
 121
 122 __setup ("dasd=", dasd_call_setup);
 123 #endif  /* #ifndef MODULE */
 124
 125 #define DASD_IPLDEV     "ipldev"
 126
 127 /*
 128  * Read a device busid/devno from a string.
 129  */
 130 static int
 131
 132 dasd_busid(char **str, int *id0, int *id1, int *devno)
 133 {
 134         int val, old_style;
 135
 136         /* Interpret ipldev busid */
 137         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 138                 if (ipl_info.type != IPL_TYPE_CCW) {
 139                         pr_err("The IPL device is not a CCW device\n");
 140                         return -EINVAL;
 141                 }
 142                 *id0 = 0;
 143                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 144                 *devno = ipl_info.data.ccw.dev_id.devno;
 145                 *str += strlen(DASD_IPLDEV);
 146
 147                 return 0;
 148         }
 149         /* check for leading '0x' */
 150         old_style = 0;
 151         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 152                 *str += 2;
 153                 old_style = 1;
 154         }
 155         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 156                 return -EINVAL;
 157         val = simple_strtoul(*str, str, 16);
 158         if (old_style || (*str)[0] != '.') {
 159                 *id0 = *id1 = 0;
 160                 if (val < 0 || val > 0xffff)
 161                         return -EINVAL;
 162                 *devno = val;
 163                 return 0;
 164         }
 165         /* New style x.y.z busid */
 166         if (val < 0 || val > 0xff)
 167                 return -EINVAL;
 168         *id0 = val;
 169         (*str)++;
 170         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 171                 return -EINVAL;
 172         val = simple_strtoul(*str, str, 16);
 173         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 174                 return -EINVAL;
 175         *id1 = val;
 176         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 177                 return -EINVAL;
 178         val = simple_strtoul(*str, str, 16);
 179         if (val < 0 || val > 0xffff)
 180                 return -EINVAL;
 181         *devno = val;
 182         return 0;
 183 }
 184
 185 /*
 186  * Read colon separated list of dasd features. Currently there is
 187  * only one: "ro" for read-only devices. The default feature set
 188  * is empty (value 0).
 189  */
 190 static int
 191 dasd_feature_list(char *str, char **endp)
 192 {
 193         int features, len, rc;
 194
 195         rc = 0;
 196         if (*str != '(') {
 197                 *endp = str;
 198                 return DASD_FEATURE_DEFAULT;
 199         }
 200         str++;
 201         features = 0;
 202
 203         while (1) {
 204                 for (len = 0;
 205                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 206                 if (len == 2 && !strncmp(str, "ro", 2))
 207                         features |= DASD_FEATURE_READONLY;
 208                 else if (len == 4 && !strncmp(str, "diag", 4))
 209                         features |= DASD_FEATURE_USEDIAG;
 210                 else if (len == 3 && !strncmp(str, "raw", 3))
 211                         features |= DASD_FEATURE_USERAW;
 212                 else if (len == 6 && !strncmp(str, "erplog", 6))
 213                         features |= DASD_FEATURE_ERPLOG;
 214                 else if (len == 8 && !strncmp(str, "failfast", 8))
 215                         features |= DASD_FEATURE_FAILFAST;
 216                 else {
 217                         pr_warn("%*s is not a supported device option\n",
 218                                 len, str);
 219                         rc = -EINVAL;
 220                 }
 221                 str += len;
 222                 if (*str != ':')
 223                         break;
 224                 str++;
 225         }
 226         if (*str != ')') {
 227                 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
 228                 rc = -EINVAL;
 229         } else
 230                 str++;
 231         *endp = str;
 232         if (rc != 0)
 233                 return rc;
 234         return features;
 235 }
 236
 237 /*
 238  * Try to match the first element on the comma separated parse string
 239  * with one of the known keywords. If a keyword is found, take the approprate
 240  * action and return a pointer to the residual string. If the first element
 241  * could not be matched to any keyword then return an error code.
 242  */
 243 static char *
 244 dasd_parse_keyword( char *parsestring ) {
 245
 246         char *nextcomma, *residual_str;
 247         int length;
 248
 249         nextcomma = strchr(parsestring,',');
 250         if (nextcomma) {
 251                 length = nextcomma - parsestring;
 252                 residual_str = nextcomma + 1;
 253         } else {
 254                 length = strlen(parsestring);
 255                 residual_str = parsestring + length;
 256         }
 257         if (strncmp("autodetect", parsestring, length) == 0) {
 258                 dasd_autodetect = 1;
 259                 pr_info("The autodetection mode has been activated\n");
 260                 return residual_str;
 261         }
 262         if (strncmp("probeonly", parsestring, length) == 0) {
 263                 dasd_probeonly = 1;
 264                 pr_info("The probeonly mode has been activated\n");
 265                 return residual_str;
 266         }
 267         if (strncmp("nopav", parsestring, length) == 0) {
 268                 if (MACHINE_IS_VM)
 269                         pr_info("'nopav' is not supported on z/VM\n");
 270                 else {
 271                         dasd_nopav = 1;
 272                         pr_info("PAV support has be deactivated\n");
 273                 }
 274                 return residual_str;
 275         }
 276         if (strncmp("nofcx", parsestring, length) == 0) {
 277                 dasd_nofcx = 1;
 278                 pr_info("High Performance FICON support has been "
 279                         "deactivated\n");
 280                 return residual_str;
 281         }
 282         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 283                 if (dasd_page_cache)
 284                         return residual_str;
 285                 dasd_page_cache =
 286                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 287                                           PAGE_SIZE, SLAB_CACHE_DMA,
 288                                           NULL);
 289                 if (!dasd_page_cache)
 290                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 291                                 "fixed buffer mode disabled.");
 292                 else
 293                         DBF_EVENT(DBF_INFO, "%s",
 294                                  "turning on fixed buffer mode");
 295                 return residual_str;
 296         }
 297         return ERR_PTR(-EINVAL);
 298 }
 299
 300 /*
 301  * Try to interprete the first element on the comma separated parse string
 302  * as a device number or a range of devices. If the interpretation is
 303  * successful, create the matching dasd_devmap entries and return a pointer
 304  * to the residual string.
 305  * If interpretation fails or in case of an error, return an error code.
 306  */
 307 static char *
 308 dasd_parse_range( char *parsestring ) {
 309
 310         struct dasd_devmap *devmap;
 311         int from, from_id0, from_id1;
 312         int to, to_id0, to_id1;
 313         int features, rc;
 314         char bus_id[DASD_BUS_ID_SIZE+1], *str;
 315
 316         str = parsestring;
 317         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 318         if (rc == 0) {
 319                 to = from;
 320                 to_id0 = from_id0;
 321                 to_id1 = from_id1;
 322                 if (*str == '-') {
 323                         str++;
 324                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 325                 }
 326         }
 327         if (rc == 0 &&
 328             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 329                 rc = -EINVAL;
 330         if (rc) {
 331                 pr_err("%s is not a valid device range\n", parsestring);
 332                 return ERR_PTR(rc);
 333         }
 334         features = dasd_feature_list(str, &str);
 335         if (features < 0)
 336                 return ERR_PTR(-EINVAL);
 337         /* each device in dasd= parameter should be set initially online */
 338         features |= DASD_FEATURE_INITIAL_ONLINE;
 339         while (from <= to) {
 340                 sprintf(bus_id, "%01x.%01x.%04x",
 341                         from_id0, from_id1, from++);
 342                 devmap = dasd_add_busid(bus_id, features);
 343                 if (IS_ERR(devmap))
 344                         return (char *)devmap;
 345         }
 346         if (*str == ',')
 347                 return str + 1;
 348         if (*str == '\0')
 349                 return str;
 350         pr_warn("The dasd= parameter value %s has an invalid ending\n", str);
 351         return ERR_PTR(-EINVAL);
 352 }
 353
 354 static char *
 355 dasd_parse_next_element( char *parsestring ) {
 356         char * residual_str;
 357         residual_str = dasd_parse_keyword(parsestring);
 358         if (!IS_ERR(residual_str))
 359                 return residual_str;
 360         residual_str = dasd_parse_range(parsestring);
 361         return residual_str;
 362 }
 363
 364 /*
 365  * Parse parameters stored in dasd[]
 366  * The 'dasd=...' parameter allows to specify a comma separated list of
 367  * keywords and device ranges. When the dasd driver is build into the kernel,
 368  * the complete list will be stored as one element of the dasd[] array.
 369  * When the dasd driver is build as a module, then the list is broken into
 370  * it's elements and each dasd[] entry contains one element.
 371  */
 372 int
 373 dasd_parse(void)
 374 {
 375         int rc, i;
 376         char *parsestring;
 377
 378         rc = 0;
 379         for (i = 0; i < 256; i++) {
 380                 if (dasd[i] == NULL)
 381                         break;
 382                 parsestring = dasd[i];
 383                 /* loop over the comma separated list in the parsestring */
 384                 while (*parsestring) {
 385                         parsestring = dasd_parse_next_element(parsestring);
 386                         if(IS_ERR(parsestring)) {
 387                                 rc = PTR_ERR(parsestring);
 388                                 break;
 389                         }
 390                 }
 391                 if (rc) {
 392                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 393                         break;
 394                 }
 395         }
 396         return rc;
 397 }
 398
 399 /*
 400  * Add a devmap for the device specified by busid. It is possible that
 401  * the devmap already exists (dasd= parameter). The order of the devices
 402  * added through this function will define the kdevs for the individual
 403  * devices.
 404  */
 405 static struct dasd_devmap *
 406 dasd_add_busid(const char *bus_id, int features)
 407 {
 408         struct dasd_devmap *devmap, *new, *tmp;
 409         int hash;
 410
 411         new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 412         if (!new)
 413                 return ERR_PTR(-ENOMEM);
 414         spin_lock(&dasd_devmap_lock);
 415         devmap = NULL;
 416         hash = dasd_hash_busid(bus_id);
 417         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 418                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 419                         devmap = tmp;
 420                         break;
 421                 }
 422         if (!devmap) {
 423                 /* This bus_id is new. */
 424                 new->devindex = dasd_max_devindex++;
 425                 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
 426                 new->features = features;
 427                 new->device = NULL;
 428                 list_add(&new->list, &dasd_hashlists[hash]);
 429                 devmap = new;
 430                 new = NULL;
 431         }
 432         spin_unlock(&dasd_devmap_lock);
 433         kfree(new);
 434         return devmap;
 435 }
 436
 437 /*
 438  * Find devmap for device with given bus_id.
 439  */
 440 static struct dasd_devmap *
 441 dasd_find_busid(const char *bus_id)
 442 {
 443         struct dasd_devmap *devmap, *tmp;
 444         int hash;
 445
 446         spin_lock(&dasd_devmap_lock);
 447         devmap = ERR_PTR(-ENODEV);
 448         hash = dasd_hash_busid(bus_id);
 449         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 450                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 451                         devmap = tmp;
 452                         break;
 453                 }
 454         }
 455         spin_unlock(&dasd_devmap_lock);
 456         return devmap;
 457 }
 458
 459 /*
 460  * Check if busid has been added to the list of dasd ranges.
 461  */
 462 int
 463 dasd_busid_known(const char *bus_id)
 464 {
 465         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 466 }
 467
 468 /*
 469  * Forget all about the device numbers added so far.
 470  * This may only be called at module unload or system shutdown.
 471  */
 472 static void
 473 dasd_forget_ranges(void)
 474 {
 475         struct dasd_devmap *devmap, *n;
 476         int i;
 477
 478         spin_lock(&dasd_devmap_lock);
 479         for (i = 0; i < 256; i++) {
 480                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 481                         BUG_ON(devmap->device != NULL);
 482                         list_del(&devmap->list);
 483                         kfree(devmap);
 484                 }
 485         }
 486         spin_unlock(&dasd_devmap_lock);
 487 }
 488
 489 /*
 490  * Find the device struct by its device index.
 491  */
 492 struct dasd_device *
 493 dasd_device_from_devindex(int devindex)
 494 {
 495         struct dasd_devmap *devmap, *tmp;
 496         struct dasd_device *device;
 497         int i;
 498
 499         spin_lock(&dasd_devmap_lock);
 500         devmap = NULL;
 501         for (i = 0; (i < 256) && !devmap; i++)
 502                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 503                         if (tmp->devindex == devindex) {
 504                                 /* Found the devmap for the device. */
 505                                 devmap = tmp;
 506                                 break;
 507                         }
 508         if (devmap && devmap->device) {
 509                 device = devmap->device;
 510                 dasd_get_device(device);
 511         } else
 512                 device = ERR_PTR(-ENODEV);
 513         spin_unlock(&dasd_devmap_lock);
 514         return device;
 515 }
 516
 517 /*
 518  * Return devmap for cdev. If no devmap exists yet, create one and
 519  * connect it to the cdev.
 520  */
 521 static struct dasd_devmap *
 522 dasd_devmap_from_cdev(struct ccw_device *cdev)
 523 {
 524         struct dasd_devmap *devmap;
 525
 526         devmap = dasd_find_busid(dev_name(&cdev->dev));
 527         if (IS_ERR(devmap))
 528                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 529                                         DASD_FEATURE_DEFAULT);
 530         return devmap;
 531 }
 532
 533 /*
 534  * Create a dasd device structure for cdev.
 535  */
 536 struct dasd_device *
 537 dasd_create_device(struct ccw_device *cdev)
 538 {
 539         struct dasd_devmap *devmap;
 540         struct dasd_device *device;
 541         unsigned long flags;
 542         int rc;
 543
 544         devmap = dasd_devmap_from_cdev(cdev);
 545         if (IS_ERR(devmap))
 546                 return (void *) devmap;
 547
 548         device = dasd_alloc_device();
 549         if (IS_ERR(device))
 550                 return device;
 551         atomic_set(&device->ref_count, 3);
 552
 553         spin_lock(&dasd_devmap_lock);
 554         if (!devmap->device) {
 555                 devmap->device = device;
 556                 device->devindex = devmap->devindex;
 557                 device->features = devmap->features;
 558                 get_device(&cdev->dev);
 559                 device->cdev = cdev;
 560                 rc = 0;
 561         } else
 562                 /* Someone else was faster. */
 563                 rc = -EBUSY;
 564         spin_unlock(&dasd_devmap_lock);
 565
 566         if (rc) {
 567                 dasd_free_device(device);
 568                 return ERR_PTR(rc);
 569         }
 570
 571         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 572         dev_set_drvdata(&cdev->dev, device);
 573         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 574
 575         return device;
 576 }
 577
 578 /*
 579  * Wait queue for dasd_delete_device waits.
 580  */
 581 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 582
 583 /*
 584  * Remove a dasd device structure. The passed referenced
 585  * is destroyed.
 586  */
 587 void
 588 dasd_delete_device(struct dasd_device *device)
 589 {
 590         struct ccw_device *cdev;
 591         struct dasd_devmap *devmap;
 592         unsigned long flags;
 593
 594         /* First remove device pointer from devmap. */
 595         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 596         BUG_ON(IS_ERR(devmap));
 597         spin_lock(&dasd_devmap_lock);
 598         if (devmap->device != device) {
 599                 spin_unlock(&dasd_devmap_lock);
 600                 dasd_put_device(device);
 601                 return;
 602         }
 603         devmap->device = NULL;
 604         spin_unlock(&dasd_devmap_lock);
 605
 606         /* Disconnect dasd_device structure from ccw_device structure. */
 607         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 608         dev_set_drvdata(&device->cdev->dev, NULL);
 609         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 610
 611         /*
 612          * Drop ref_count by 3, one for the devmap reference, one for
 613          * the cdev reference and one for the passed reference.
 614          */
 615         atomic_sub(3, &device->ref_count);
 616
 617         /* Wait for reference counter to drop to zero. */
 618         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 619
 620         dasd_generic_free_discipline(device);
 621         /* Disconnect dasd_device structure from ccw_device structure. */
 622         cdev = device->cdev;
 623         device->cdev = NULL;
 624
 625         /* Put ccw_device structure. */
 626         put_device(&cdev->dev);
 627
 628         /* Now the device structure can be freed. */
 629         dasd_free_device(device);
 630 }
 631
 632 /*
 633  * Reference counter dropped to zero. Wake up waiter
 634  * in dasd_delete_device.
 635  */
 636 void
 637 dasd_put_device_wake(struct dasd_device *device)
 638 {
 639         wake_up(&dasd_delete_wq);
 640 }
 641 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 642
 643 /*
 644  * Return dasd_device structure associated with cdev.
 645  * This function needs to be called with the ccw device
 646  * lock held. It can be used from interrupt context.
 647  */
 648 struct dasd_device *
 649 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 650 {
 651         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 652
 653         if (!device)
 654                 return ERR_PTR(-ENODEV);
 655         dasd_get_device(device);
 656         return device;
 657 }
 658
 659 /*
 660  * Return dasd_device structure associated with cdev.
 661  */
 662 struct dasd_device *
 663 dasd_device_from_cdev(struct ccw_device *cdev)
 664 {
 665         struct dasd_device *device;
 666         unsigned long flags;
 667
 668         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 669         device = dasd_device_from_cdev_locked(cdev);
 670         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 671         return device;
 672 }
 673
 674 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 675 {
 676         struct dasd_devmap *devmap;
 677
 678         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 679         if (IS_ERR(devmap))
 680                 return;
 681         spin_lock(&dasd_devmap_lock);
 682         gdp->private_data = devmap;
 683         spin_unlock(&dasd_devmap_lock);
 684 }
 685
 686 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 687 {
 688         struct dasd_device *device;
 689         struct dasd_devmap *devmap;
 690
 691         if (!gdp->private_data)
 692                 return NULL;
 693         device = NULL;
 694         spin_lock(&dasd_devmap_lock);
 695         devmap = gdp->private_data;
 696         if (devmap && devmap->device) {
 697                 device = devmap->device;
 698                 dasd_get_device(device);
 699         }
 700         spin_unlock(&dasd_devmap_lock);
 701         return device;
 702 }
 703
 704 /*
 705  * SECTION: files in sysfs
 706  */
 707
 708 /*
 709  * failfast controls the behaviour, if no path is available
 710  */
 711 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 712                             char *buf)
 713 {
 714         struct dasd_devmap *devmap;
 715         int ff_flag;
 716
 717         devmap = dasd_find_busid(dev_name(dev));
 718         if (!IS_ERR(devmap))
 719                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 720         else
 721                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 722         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 723 }
 724
 725 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 726               const char *buf, size_t count)
 727 {
 728         struct dasd_devmap *devmap;
 729         int val;
 730         char *endp;
 731
 732         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 733         if (IS_ERR(devmap))
 734                 return PTR_ERR(devmap);
 735
 736         val = simple_strtoul(buf, &endp, 0);
 737         if (((endp + 1) < (buf + count)) || (val > 1))
 738                 return -EINVAL;
 739
 740         spin_lock(&dasd_devmap_lock);
 741         if (val)
 742                 devmap->features |= DASD_FEATURE_FAILFAST;
 743         else
 744                 devmap->features &= ~DASD_FEATURE_FAILFAST;
 745         if (devmap->device)
 746                 devmap->device->features = devmap->features;
 747         spin_unlock(&dasd_devmap_lock);
 748         return count;
 749 }
 750
 751 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 752
 753 /*
 754  * readonly controls the readonly status of a dasd
 755  */
 756 static ssize_t
 757 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 758 {
 759         struct dasd_devmap *devmap;
 760         int ro_flag;
 761
 762         devmap = dasd_find_busid(dev_name(dev));
 763         if (!IS_ERR(devmap))
 764                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 765         else
 766                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 767         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 768 }
 769
 770 static ssize_t
 771 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 772               const char *buf, size_t count)
 773 {
 774         struct dasd_devmap *devmap;
 775         struct dasd_device *device;
 776         int val;
 777         char *endp;
 778
 779         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 780         if (IS_ERR(devmap))
 781                 return PTR_ERR(devmap);
 782
 783         val = simple_strtoul(buf, &endp, 0);
 784         if (((endp + 1) < (buf + count)) || (val > 1))
 785                 return -EINVAL;
 786
 787         spin_lock(&dasd_devmap_lock);
 788         if (val)
 789                 devmap->features |= DASD_FEATURE_READONLY;
 790         else
 791                 devmap->features &= ~DASD_FEATURE_READONLY;
 792         device = devmap->device;
 793         if (device) {
 794                 device->features = devmap->features;
 795                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 796         }
 797         spin_unlock(&dasd_devmap_lock);
 798         if (device && device->block && device->block->gdp)
 799                 set_disk_ro(device->block->gdp, val);
 800         return count;
 801 }
 802
 803 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 804 /*
 805  * erplog controls the logging of ERP related data
 806  * (e.g. failing channel programs).
 807  */
 808 static ssize_t
 809 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 810 {
 811         struct dasd_devmap *devmap;
 812         int erplog;
 813
 814         devmap = dasd_find_busid(dev_name(dev));
 815         if (!IS_ERR(devmap))
 816                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 817         else
 818                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 819         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 820 }
 821
 822 static ssize_t
 823 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 824               const char *buf, size_t count)
 825 {
 826         struct dasd_devmap *devmap;
 827         int val;
 828         char *endp;
 829
 830         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 831         if (IS_ERR(devmap))
 832                 return PTR_ERR(devmap);
 833
 834         val = simple_strtoul(buf, &endp, 0);
 835         if (((endp + 1) < (buf + count)) || (val > 1))
 836                 return -EINVAL;
 837
 838         spin_lock(&dasd_devmap_lock);
 839         if (val)
 840                 devmap->features |= DASD_FEATURE_ERPLOG;
 841         else
 842                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 843         if (devmap->device)
 844                 devmap->device->features = devmap->features;
 845         spin_unlock(&dasd_devmap_lock);
 846         return count;
 847 }
 848
 849 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 850
 851 /*
 852  * use_diag controls whether the driver should use diag rather than ssch
 853  * to talk to the device
 854  */
 855 static ssize_t
 856 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 857 {
 858         struct dasd_devmap *devmap;
 859         int use_diag;
 860
 861         devmap = dasd_find_busid(dev_name(dev));
 862         if (!IS_ERR(devmap))
 863                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 864         else
 865                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 866         return sprintf(buf, use_diag ? "1\n" : "0\n");
 867 }
 868
 869 static ssize_t
 870 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 871                     const char *buf, size_t count)
 872 {
 873         struct dasd_devmap *devmap;
 874         ssize_t rc;
 875         int val;
 876         char *endp;
 877
 878         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 879         if (IS_ERR(devmap))
 880                 return PTR_ERR(devmap);
 881
 882         val = simple_strtoul(buf, &endp, 0);
 883         if (((endp + 1) < (buf + count)) || (val > 1))
 884                 return -EINVAL;
 885
 886         spin_lock(&dasd_devmap_lock);
 887         /* Changing diag discipline flag is only allowed in offline state. */
 888         rc = count;
 889         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 890                 if (val)
 891                         devmap->features |= DASD_FEATURE_USEDIAG;
 892                 else
 893                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 894         } else
 895                 rc = -EPERM;
 896         spin_unlock(&dasd_devmap_lock);
 897         return rc;
 898 }
 899
 900 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 901
 902 /*
 903  * use_raw controls whether the driver should give access to raw eckd data or
 904  * operate in standard mode
 905  */
 906 static ssize_t
 907 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 908 {
 909         struct dasd_devmap *devmap;
 910         int use_raw;
 911
 912         devmap = dasd_find_busid(dev_name(dev));
 913         if (!IS_ERR(devmap))
 914                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 915         else
 916                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 917         return sprintf(buf, use_raw ? "1\n" : "0\n");
 918 }
 919
 920 static ssize_t
 921 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 922                     const char *buf, size_t count)
 923 {
 924         struct dasd_devmap *devmap;
 925         ssize_t rc;
 926         unsigned long val;
 927
 928         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 929         if (IS_ERR(devmap))
 930                 return PTR_ERR(devmap);
 931
 932         if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
 933                 return -EINVAL;
 934
 935         spin_lock(&dasd_devmap_lock);
 936         /* Changing diag discipline flag is only allowed in offline state. */
 937         rc = count;
 938         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 939                 if (val)
 940                         devmap->features |= DASD_FEATURE_USERAW;
 941                 else
 942                         devmap->features &= ~DASD_FEATURE_USERAW;
 943         } else
 944                 rc = -EPERM;
 945         spin_unlock(&dasd_devmap_lock);
 946         return rc;
 947 }
 948
 949 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 950                    dasd_use_raw_store);
 951
 952 static ssize_t
 953 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
 954                         const char *buf, size_t count)
 955 {
 956         struct ccw_device *cdev = to_ccwdev(dev);
 957         struct dasd_device *device;
 958         int rc;
 959
 960         device = dasd_device_from_cdev(cdev);
 961         if (IS_ERR(device)) {
 962                 rc = PTR_ERR(device);
 963                 goto out;
 964         }
 965
 966         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
 967             test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 968                 /* Already doing offline processing */
 969                 dasd_put_device(device);
 970                 rc = -EBUSY;
 971                 goto out;
 972         }
 973
 974         set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
 975         dasd_put_device(device);
 976
 977         rc = ccw_device_set_offline(cdev);
 978
 979 out:
 980         return rc ? rc : count;
 981 }
 982
 983 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
 984
 985 static ssize_t
 986 dasd_access_show(struct device *dev, struct device_attribute *attr,
 987                  char *buf)
 988 {
 989         struct ccw_device *cdev = to_ccwdev(dev);
 990         struct dasd_device *device;
 991         int count;
 992
 993         device = dasd_device_from_cdev(cdev);
 994         if (IS_ERR(device))
 995                 return PTR_ERR(device);
 996
 997         if (device->discipline->host_access_count)
 998                 count = device->discipline->host_access_count(device);
 999         else
1000                 count = -EOPNOTSUPP;
1001
1002         dasd_put_device(device);
1003         if (count < 0)
1004                 return count;
1005
1006         return sprintf(buf, "%d\n", count);
1007 }
1008
1009 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1010
1011 static ssize_t
1012 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1013                      char *buf)
1014 {
1015         struct dasd_device *device;
1016         ssize_t len;
1017
1018         device = dasd_device_from_cdev(to_ccwdev(dev));
1019         if (IS_ERR(device))
1020                 goto out;
1021         else if (!device->discipline) {
1022                 dasd_put_device(device);
1023                 goto out;
1024         } else {
1025                 len = snprintf(buf, PAGE_SIZE, "%s\n",
1026                                device->discipline->name);
1027                 dasd_put_device(device);
1028                 return len;
1029         }
1030 out:
1031         len = snprintf(buf, PAGE_SIZE, "none\n");
1032         return len;
1033 }
1034
1035 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1036
1037 static ssize_t
1038 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1039                      char *buf)
1040 {
1041         struct dasd_device *device;
1042         ssize_t len;
1043
1044         device = dasd_device_from_cdev(to_ccwdev(dev));
1045         if (!IS_ERR(device)) {
1046                 switch (device->state) {
1047                 case DASD_STATE_NEW:
1048                         len = snprintf(buf, PAGE_SIZE, "new\n");
1049                         break;
1050                 case DASD_STATE_KNOWN:
1051                         len = snprintf(buf, PAGE_SIZE, "detected\n");
1052                         break;
1053                 case DASD_STATE_BASIC:
1054                         len = snprintf(buf, PAGE_SIZE, "basic\n");
1055                         break;
1056                 case DASD_STATE_UNFMT:
1057                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1058                         break;
1059                 case DASD_STATE_READY:
1060                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1061                         break;
1062                 case DASD_STATE_ONLINE:
1063                         len = snprintf(buf, PAGE_SIZE, "online\n");
1064                         break;
1065                 default:
1066                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1067                         break;
1068                 }
1069                 dasd_put_device(device);
1070         } else
1071                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1072         return len;
1073 }
1074
1075 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1076
1077 static ssize_t dasd_alias_show(struct device *dev,
1078                                struct device_attribute *attr, char *buf)
1079 {
1080         struct dasd_device *device;
1081         struct dasd_uid uid;
1082
1083         device = dasd_device_from_cdev(to_ccwdev(dev));
1084         if (IS_ERR(device))
1085                 return sprintf(buf, "0\n");
1086
1087         if (device->discipline && device->discipline->get_uid &&
1088             !device->discipline->get_uid(device, &uid)) {
1089                 if (uid.type == UA_BASE_PAV_ALIAS ||
1090                     uid.type == UA_HYPER_PAV_ALIAS) {
1091                         dasd_put_device(device);
1092                         return sprintf(buf, "1\n");
1093                 }
1094         }
1095         dasd_put_device(device);
1096
1097         return sprintf(buf, "0\n");
1098 }
1099
1100 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1101
1102 static ssize_t dasd_vendor_show(struct device *dev,
1103                                 struct device_attribute *attr, char *buf)
1104 {
1105         struct dasd_device *device;
1106         struct dasd_uid uid;
1107         char *vendor;
1108
1109         device = dasd_device_from_cdev(to_ccwdev(dev));
1110         vendor = "";
1111         if (IS_ERR(device))
1112                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1113
1114         if (device->discipline && device->discipline->get_uid &&
1115             !device->discipline->get_uid(device, &uid))
1116                         vendor = uid.vendor;
1117
1118         dasd_put_device(device);
1119
1120         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1121 }
1122
1123 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1124
1125 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1126                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1127                      /* vduit */ 32 + 1)
1128
1129 static ssize_t
1130 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1131 {
1132         struct dasd_device *device;
1133         struct dasd_uid uid;
1134         char uid_string[UID_STRLEN];
1135         char ua_string[3];
1136
1137         device = dasd_device_from_cdev(to_ccwdev(dev));
1138         uid_string[0] = 0;
1139         if (IS_ERR(device))
1140                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1141
1142         if (device->discipline && device->discipline->get_uid &&
1143             !device->discipline->get_uid(device, &uid)) {
1144                 switch (uid.type) {
1145                 case UA_BASE_DEVICE:
1146                         snprintf(ua_string, sizeof(ua_string), "%02x",
1147                                  uid.real_unit_addr);
1148                         break;
1149                 case UA_BASE_PAV_ALIAS:
1150                         snprintf(ua_string, sizeof(ua_string), "%02x",
1151                                  uid.base_unit_addr);
1152                         break;
1153                 case UA_HYPER_PAV_ALIAS:
1154                         snprintf(ua_string, sizeof(ua_string), "xx");
1155                         break;
1156                 default:
1157                         /* should not happen, treat like base device */
1158                         snprintf(ua_string, sizeof(ua_string), "%02x",
1159                                  uid.real_unit_addr);
1160                         break;
1161                 }
1162
1163                 if (strlen(uid.vduit) > 0)
1164                         snprintf(uid_string, sizeof(uid_string),
1165                                  "%s.%s.%04x.%s.%s",
1166                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1167                                  uid.vduit);
1168                 else
1169                         snprintf(uid_string, sizeof(uid_string),
1170                                  "%s.%s.%04x.%s",
1171                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1172         }
1173         dasd_put_device(device);
1174
1175         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1176 }
1177 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1178
1179 /*
1180  * extended error-reporting
1181  */
1182 static ssize_t
1183 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1184 {
1185         struct dasd_devmap *devmap;
1186         int eer_flag;
1187
1188         devmap = dasd_find_busid(dev_name(dev));
1189         if (!IS_ERR(devmap) && devmap->device)
1190                 eer_flag = dasd_eer_enabled(devmap->device);
1191         else
1192                 eer_flag = 0;
1193         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1194 }
1195
1196 static ssize_t
1197 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1198                const char *buf, size_t count)
1199 {
1200         struct dasd_devmap *devmap;
1201         int val, rc;
1202         char *endp;
1203
1204         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1205         if (IS_ERR(devmap))
1206                 return PTR_ERR(devmap);
1207         if (!devmap->device)
1208                 return -ENODEV;
1209
1210         val = simple_strtoul(buf, &endp, 0);
1211         if (((endp + 1) < (buf + count)) || (val > 1))
1212                 return -EINVAL;
1213
1214         if (val) {
1215                 rc = dasd_eer_enable(devmap->device);
1216                 if (rc)
1217                         return rc;
1218         } else
1219                 dasd_eer_disable(devmap->device);
1220         return count;
1221 }
1222
1223 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1224
1225 /*
1226  * expiration time for default requests
1227  */
1228 static ssize_t
1229 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1230 {
1231         struct dasd_device *device;
1232         int len;
1233
1234         device = dasd_device_from_cdev(to_ccwdev(dev));
1235         if (IS_ERR(device))
1236                 return -ENODEV;
1237         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1238         dasd_put_device(device);
1239         return len;
1240 }
1241
1242 static ssize_t
1243 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1244                const char *buf, size_t count)
1245 {
1246         struct dasd_device *device;
1247         unsigned long val;
1248
1249         device = dasd_device_from_cdev(to_ccwdev(dev));
1250         if (IS_ERR(device))
1251                 return -ENODEV;
1252
1253         if ((kstrtoul(buf, 10, &val) != 0) ||
1254             (val > DASD_EXPIRES_MAX) || val == 0) {
1255                 dasd_put_device(device);
1256                 return -EINVAL;
1257         }
1258
1259         if (val)
1260                 device->default_expires = val;
1261
1262         dasd_put_device(device);
1263         return count;
1264 }
1265
1266 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1267
1268 static ssize_t
1269 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1270 {
1271         struct dasd_device *device;
1272         int len;
1273
1274         device = dasd_device_from_cdev(to_ccwdev(dev));
1275         if (IS_ERR(device))
1276                 return -ENODEV;
1277         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1278         dasd_put_device(device);
1279         return len;
1280 }
1281
1282 static ssize_t
1283 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1284                    const char *buf, size_t count)
1285 {
1286         struct dasd_device *device;
1287         unsigned long val;
1288
1289         device = dasd_device_from_cdev(to_ccwdev(dev));
1290         if (IS_ERR(device))
1291                 return -ENODEV;
1292
1293         if ((kstrtoul(buf, 10, &val) != 0) ||
1294             (val > DASD_RETRIES_MAX)) {
1295                 dasd_put_device(device);
1296                 return -EINVAL;
1297         }
1298
1299         if (val)
1300                 device->default_retries = val;
1301
1302         dasd_put_device(device);
1303         return count;
1304 }
1305
1306 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1307
1308 static ssize_t
1309 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1310                   char *buf)
1311 {
1312         struct dasd_device *device;
1313         int len;
1314
1315         device = dasd_device_from_cdev(to_ccwdev(dev));
1316         if (IS_ERR(device))
1317                 return -ENODEV;
1318         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1319         dasd_put_device(device);
1320         return len;
1321 }
1322
1323 static ssize_t
1324 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1325                    const char *buf, size_t count)
1326 {
1327         struct dasd_device *device;
1328         struct request_queue *q;
1329         unsigned long val, flags;
1330
1331         device = dasd_device_from_cdev(to_ccwdev(dev));
1332         if (IS_ERR(device) || !device->block)
1333                 return -ENODEV;
1334
1335         if ((kstrtoul(buf, 10, &val) != 0) ||
1336             val > UINT_MAX / HZ) {
1337                 dasd_put_device(device);
1338                 return -EINVAL;
1339         }
1340         q = device->block->request_queue;
1341         if (!q) {
1342                 dasd_put_device(device);
1343                 return -ENODEV;
1344         }
1345         spin_lock_irqsave(&device->block->request_queue_lock, flags);
1346         if (!val)
1347                 blk_queue_rq_timed_out(q, NULL);
1348         else
1349                 blk_queue_rq_timed_out(q, dasd_times_out);
1350
1351         device->blk_timeout = val;
1352
1353         blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1354         spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1355
1356         dasd_put_device(device);
1357         return count;
1358 }
1359
1360 static DEVICE_ATTR(timeout, 0644,
1361                    dasd_timeout_show, dasd_timeout_store);
1362
1363 static ssize_t dasd_reservation_policy_show(struct device *dev,
1364                                             struct device_attribute *attr,
1365                                             char *buf)
1366 {
1367         struct dasd_devmap *devmap;
1368         int rc = 0;
1369
1370         devmap = dasd_find_busid(dev_name(dev));
1371         if (IS_ERR(devmap)) {
1372                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1373         } else {
1374                 spin_lock(&dasd_devmap_lock);
1375                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1376                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1377                 else
1378                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1379                 spin_unlock(&dasd_devmap_lock);
1380         }
1381         return rc;
1382 }
1383
1384 static ssize_t dasd_reservation_policy_store(struct device *dev,
1385                                              struct device_attribute *attr,
1386                                              const char *buf, size_t count)
1387 {
1388         struct dasd_devmap *devmap;
1389         int rc;
1390
1391         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1392         if (IS_ERR(devmap))
1393                 return PTR_ERR(devmap);
1394         rc = 0;
1395         spin_lock(&dasd_devmap_lock);
1396         if (sysfs_streq("ignore", buf))
1397                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1398         else if (sysfs_streq("fail", buf))
1399                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1400         else
1401                 rc = -EINVAL;
1402         if (devmap->device)
1403                 devmap->device->features = devmap->features;
1404         spin_unlock(&dasd_devmap_lock);
1405         if (rc)
1406                 return rc;
1407         else
1408                 return count;
1409 }
1410
1411 static DEVICE_ATTR(reservation_policy, 0644,
1412                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1413
1414 static ssize_t dasd_reservation_state_show(struct device *dev,
1415                                            struct device_attribute *attr,
1416                                            char *buf)
1417 {
1418         struct dasd_device *device;
1419         int rc = 0;
1420
1421         device = dasd_device_from_cdev(to_ccwdev(dev));
1422         if (IS_ERR(device))
1423                 return snprintf(buf, PAGE_SIZE, "none\n");
1424
1425         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1426                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1427         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1428                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1429         else
1430                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1431         dasd_put_device(device);
1432         return rc;
1433 }
1434
1435 static ssize_t dasd_reservation_state_store(struct device *dev,
1436                                             struct device_attribute *attr,
1437                                             const char *buf, size_t count)
1438 {
1439         struct dasd_device *device;
1440         int rc = 0;
1441
1442         device = dasd_device_from_cdev(to_ccwdev(dev));
1443         if (IS_ERR(device))
1444                 return -ENODEV;
1445         if (sysfs_streq("reset", buf))
1446                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1447         else
1448                 rc = -EINVAL;
1449         dasd_put_device(device);
1450
1451         if (rc)
1452                 return rc;
1453         else
1454                 return count;
1455 }
1456
1457 static DEVICE_ATTR(last_known_reservation_state, 0644,
1458                    dasd_reservation_state_show, dasd_reservation_state_store);
1459
1460 static ssize_t dasd_pm_show(struct device *dev,
1461                               struct device_attribute *attr, char *buf)
1462 {
1463         struct dasd_device *device;
1464         u8 opm, nppm, cablepm, cuirpm, hpfpm;
1465
1466         device = dasd_device_from_cdev(to_ccwdev(dev));
1467         if (IS_ERR(device))
1468                 return sprintf(buf, "0\n");
1469
1470         opm = device->path_data.opm;
1471         nppm = device->path_data.npm;
1472         cablepm = device->path_data.cablepm;
1473         cuirpm = device->path_data.cuirpm;
1474         hpfpm = device->path_data.hpfpm;
1475         dasd_put_device(device);
1476
1477         return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm,
1478                        cablepm, cuirpm, hpfpm);
1479 }
1480
1481 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1482
1483 static struct attribute * dasd_attrs[] = {
1484         &dev_attr_readonly.attr,
1485         &dev_attr_discipline.attr,
1486         &dev_attr_status.attr,
1487         &dev_attr_alias.attr,
1488         &dev_attr_vendor.attr,
1489         &dev_attr_uid.attr,
1490         &dev_attr_use_diag.attr,
1491         &dev_attr_raw_track_access.attr,
1492         &dev_attr_eer_enabled.attr,
1493         &dev_attr_erplog.attr,
1494         &dev_attr_failfast.attr,
1495         &dev_attr_expires.attr,
1496         &dev_attr_retries.attr,
1497         &dev_attr_timeout.attr,
1498         &dev_attr_reservation_policy.attr,
1499         &dev_attr_last_known_reservation_state.attr,
1500         &dev_attr_safe_offline.attr,
1501         &dev_attr_host_access_count.attr,
1502         &dev_attr_path_masks.attr,
1503         NULL,
1504 };
1505
1506 static struct attribute_group dasd_attr_group = {
1507         .attrs = dasd_attrs,
1508 };
1509
1510 /*
1511  * Return value of the specified feature.
1512  */
1513 int
1514 dasd_get_feature(struct ccw_device *cdev, int feature)
1515 {
1516         struct dasd_devmap *devmap;
1517
1518         devmap = dasd_find_busid(dev_name(&cdev->dev));
1519         if (IS_ERR(devmap))
1520                 return PTR_ERR(devmap);
1521
1522         return ((devmap->features & feature) != 0);
1523 }
1524
1525 /*
1526  * Set / reset given feature.
1527  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1528  */
1529 int
1530 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1531 {
1532         struct dasd_devmap *devmap;
1533
1534         devmap = dasd_find_busid(dev_name(&cdev->dev));
1535         if (IS_ERR(devmap))
1536                 return PTR_ERR(devmap);
1537
1538         spin_lock(&dasd_devmap_lock);
1539         if (flag)
1540                 devmap->features |= feature;
1541         else
1542                 devmap->features &= ~feature;
1543         if (devmap->device)
1544                 devmap->device->features = devmap->features;
1545         spin_unlock(&dasd_devmap_lock);
1546         return 0;
1547 }
1548
1549
1550 int
1551 dasd_add_sysfs_files(struct ccw_device *cdev)
1552 {
1553         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1554 }
1555
1556 void
1557 dasd_remove_sysfs_files(struct ccw_device *cdev)
1558 {
1559         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1560 }
1561
1562
1563 int
1564 dasd_devmap_init(void)
1565 {
1566         int i;
1567
1568         /* Initialize devmap structures. */
1569         dasd_max_devindex = 0;
1570         for (i = 0; i < 256; i++)
1571                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1572         return 0;
1573 }
1574
1575 void
1576 dasd_devmap_exit(void)
1577 {
1578         dasd_forget_ranges();
1579 }