arch/s390/kernel/ipl.c

   1 /*
   2  *    ipl/reipl/dump support for Linux on s390.
   3  *
   4  *    Copyright IBM Corp. 2005, 2012
   5  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   6  *               Heiko Carstens <heiko.carstens@de.ibm.com>
   7  *               Volker Sameske <sameske@de.ibm.com>
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/delay.h>
  14 #include <linux/reboot.h>
  15 #include <linux/ctype.h>
  16 #include <linux/fs.h>
  17 #include <linux/gfp.h>
  18 #include <linux/crash_dump.h>
  19 #include <linux/debug_locks.h>
  20 #include <asm/diag.h>
  21 #include <asm/ipl.h>
  22 #include <asm/smp.h>
  23 #include <asm/setup.h>
  24 #include <asm/cpcmd.h>
  25 #include <asm/cio.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/reset.h>
  28 #include <asm/sclp.h>
  29 #include <asm/checksum.h>
  30 #include <asm/debug.h>
  31 #include <asm/os_info.h>
  32 #include "entry.h"
  33
  34 #define IPL_PARM_BLOCK_VERSION 0
  35
  36 #define IPL_UNKNOWN_STR         "unknown"
  37 #define IPL_CCW_STR             "ccw"
  38 #define IPL_FCP_STR             "fcp"
  39 #define IPL_FCP_DUMP_STR        "fcp_dump"
  40 #define IPL_NSS_STR             "nss"
  41
  42 #define DUMP_CCW_STR            "ccw"
  43 #define DUMP_FCP_STR            "fcp"
  44 #define DUMP_NONE_STR           "none"
  45
  46 /*
  47  * Four shutdown trigger types are supported:
  48  * - panic
  49  * - halt
  50  * - power off
  51  * - reipl
  52  * - restart
  53  */
  54 #define ON_PANIC_STR            "on_panic"
  55 #define ON_HALT_STR             "on_halt"
  56 #define ON_POFF_STR             "on_poff"
  57 #define ON_REIPL_STR            "on_reboot"
  58 #define ON_RESTART_STR          "on_restart"
  59
  60 struct shutdown_action;
  61 struct shutdown_trigger {
  62         char *name;
  63         struct shutdown_action *action;
  64 };
  65
  66 /*
  67  * The following shutdown action types are supported:
  68  */
  69 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
  70 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
  71 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
  72 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
  73 #define SHUTDOWN_ACTION_STOP_STR        "stop"
  74 #define SHUTDOWN_ACTION_DUMP_REIPL_STR  "dump_reipl"
  75
  76 struct shutdown_action {
  77         char *name;
  78         void (*fn) (struct shutdown_trigger *trigger);
  79         int (*init) (void);
  80         int init_rc;
  81 };
  82
  83 static char *ipl_type_str(enum ipl_type type)
  84 {
  85         switch (type) {
  86         case IPL_TYPE_CCW:
  87                 return IPL_CCW_STR;
  88         case IPL_TYPE_FCP:
  89                 return IPL_FCP_STR;
  90         case IPL_TYPE_FCP_DUMP:
  91                 return IPL_FCP_DUMP_STR;
  92         case IPL_TYPE_NSS:
  93                 return IPL_NSS_STR;
  94         case IPL_TYPE_UNKNOWN:
  95         default:
  96                 return IPL_UNKNOWN_STR;
  97         }
  98 }
  99
 100 enum dump_type {
 101         DUMP_TYPE_NONE  = 1,
 102         DUMP_TYPE_CCW   = 2,
 103         DUMP_TYPE_FCP   = 4,
 104 };
 105
 106 static char *dump_type_str(enum dump_type type)
 107 {
 108         switch (type) {
 109         case DUMP_TYPE_NONE:
 110                 return DUMP_NONE_STR;
 111         case DUMP_TYPE_CCW:
 112                 return DUMP_CCW_STR;
 113         case DUMP_TYPE_FCP:
 114                 return DUMP_FCP_STR;
 115         default:
 116                 return NULL;
 117         }
 118 }
 119
 120 /*
 121  * Must be in data section since the bss section
 122  * is not cleared when these are accessed.
 123  */
 124 static u8 ipl_ssid __attribute__((__section__(".data"))) = 0;
 125 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
 126 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
 127
 128 enum ipl_method {
 129         REIPL_METHOD_CCW_CIO,
 130         REIPL_METHOD_CCW_DIAG,
 131         REIPL_METHOD_CCW_VM,
 132         REIPL_METHOD_FCP_RO_DIAG,
 133         REIPL_METHOD_FCP_RW_DIAG,
 134         REIPL_METHOD_FCP_RO_VM,
 135         REIPL_METHOD_FCP_DUMP,
 136         REIPL_METHOD_NSS,
 137         REIPL_METHOD_NSS_DIAG,
 138         REIPL_METHOD_DEFAULT,
 139 };
 140
 141 enum dump_method {
 142         DUMP_METHOD_NONE,
 143         DUMP_METHOD_CCW_CIO,
 144         DUMP_METHOD_CCW_DIAG,
 145         DUMP_METHOD_CCW_VM,
 146         DUMP_METHOD_FCP_DIAG,
 147 };
 148
 149 static int diag308_set_works = 0;
 150
 151 static struct ipl_parameter_block ipl_block;
 152
 153 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 154
 155 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 156 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
 157 static struct ipl_parameter_block *reipl_block_fcp;
 158 static struct ipl_parameter_block *reipl_block_ccw;
 159 static struct ipl_parameter_block *reipl_block_nss;
 160 static struct ipl_parameter_block *reipl_block_actual;
 161
 162 static int dump_capabilities = DUMP_TYPE_NONE;
 163 static enum dump_type dump_type = DUMP_TYPE_NONE;
 164 static enum dump_method dump_method = DUMP_METHOD_NONE;
 165 static struct ipl_parameter_block *dump_block_fcp;
 166 static struct ipl_parameter_block *dump_block_ccw;
 167
 168 static struct sclp_ipl_info sclp_ipl_info;
 169
 170 static inline int __diag308(unsigned long subcode, void *addr)
 171 {
 172         register unsigned long _addr asm("0") = (unsigned long) addr;
 173         register unsigned long _rc asm("1") = 0;
 174
 175         asm volatile(
 176                 "       diag    %0,%2,0x308\n"
 177                 "0:\n"
 178                 EX_TABLE(0b,0b)
 179                 : "+d" (_addr), "+d" (_rc)
 180                 : "d" (subcode) : "cc", "memory");
 181         return _rc;
 182 }
 183
 184 int diag308(unsigned long subcode, void *addr)
 185 {
 186         diag_stat_inc(DIAG_STAT_X308);
 187         return __diag308(subcode, addr);
 188 }
 189 EXPORT_SYMBOL_GPL(diag308);
 190
 191 /* SYSFS */
 192
 193 #define IPL_ATTR_SHOW_FN(_prefix, _name, _format, args...)              \
 194 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 195                 struct kobj_attribute *attr,                            \
 196                 char *page)                                             \
 197 {                                                                       \
 198         return snprintf(page, PAGE_SIZE, _format, ##args);              \
 199 }
 200
 201 #define IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk)                 \
 202 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 203                 struct kobj_attribute *attr,                            \
 204                 const char *buf, size_t len)                            \
 205 {                                                                       \
 206         unsigned long long ssid, devno;                                 \
 207                                                                         \
 208         if (sscanf(buf, "0.%llx.%llx\n", &ssid, &devno) != 2)           \
 209                 return -EINVAL;                                         \
 210                                                                         \
 211         if (ssid > __MAX_SSID || devno > __MAX_SUBCHANNEL)              \
 212                 return -EINVAL;                                         \
 213                                                                         \
 214         _ipl_blk.ssid = ssid;                                           \
 215         _ipl_blk.devno = devno;                                         \
 216         return len;                                                     \
 217 }
 218
 219 #define DEFINE_IPL_CCW_ATTR_RW(_prefix, _name, _ipl_blk)                \
 220 IPL_ATTR_SHOW_FN(_prefix, _name, "0.%x.%04x\n",                         \
 221                  _ipl_blk.ssid, _ipl_blk.devno);                        \
 222 IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk);                        \
 223 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 224         __ATTR(_name, (S_IRUGO | S_IWUSR),                              \
 225                sys_##_prefix##_##_name##_show,                          \
 226                sys_##_prefix##_##_name##_store)                         \
 227
 228 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 229 IPL_ATTR_SHOW_FN(_prefix, _name, _format, _value)                       \
 230 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 231         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL)
 232
 233 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 234 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, (unsigned long long) _value) \
 235 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 236                 struct kobj_attribute *attr,                            \
 237                 const char *buf, size_t len)                            \
 238 {                                                                       \
 239         unsigned long long value;                                       \
 240         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 241                 return -EINVAL;                                         \
 242         _value = value;                                                 \
 243         return len;                                                     \
 244 }                                                                       \
 245 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 246         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 247                         sys_##_prefix##_##_name##_show,                 \
 248                         sys_##_prefix##_##_name##_store)
 249
 250 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
 251 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, _value)                      \
 252 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 253                 struct kobj_attribute *attr,                            \
 254                 const char *buf, size_t len)                            \
 255 {                                                                       \
 256         strncpy(_value, buf, sizeof(_value) - 1);                       \
 257         strim(_value);                                                  \
 258         return len;                                                     \
 259 }                                                                       \
 260 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 261         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 262                         sys_##_prefix##_##_name##_show,                 \
 263                         sys_##_prefix##_##_name##_store)
 264
 265 static void make_attrs_ro(struct attribute **attrs)
 266 {
 267         while (*attrs) {
 268                 (*attrs)->mode = S_IRUGO;
 269                 attrs++;
 270         }
 271 }
 272
 273 /*
 274  * ipl section
 275  */
 276
 277 static __init enum ipl_type get_ipl_type(void)
 278 {
 279         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 280
 281         if (ipl_flags & IPL_NSS_VALID)
 282                 return IPL_TYPE_NSS;
 283         if (!(ipl_flags & IPL_DEVNO_VALID))
 284                 return IPL_TYPE_UNKNOWN;
 285         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 286                 return IPL_TYPE_CCW;
 287         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 288                 return IPL_TYPE_UNKNOWN;
 289         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 290                 return IPL_TYPE_UNKNOWN;
 291         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
 292                 return IPL_TYPE_FCP_DUMP;
 293         return IPL_TYPE_FCP;
 294 }
 295
 296 struct ipl_info ipl_info;
 297 EXPORT_SYMBOL_GPL(ipl_info);
 298
 299 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
 300                              char *page)
 301 {
 302         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
 303 }
 304
 305 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 306
 307 /* VM IPL PARM routines */
 308 static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
 309                                      const struct ipl_parameter_block *ipb)
 310 {
 311         int i;
 312         size_t len;
 313         char has_lowercase = 0;
 314
 315         len = 0;
 316         if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
 317             (ipb->ipl_info.ccw.vm_parm_len > 0)) {
 318
 319                 len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
 320                 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
 321                 /* If at least one character is lowercase, we assume mixed
 322                  * case; otherwise we convert everything to lowercase.
 323                  */
 324                 for (i = 0; i < len; i++)
 325                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
 326                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
 327                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
 328                                 has_lowercase = 1;
 329                                 break;
 330                         }
 331                 if (!has_lowercase)
 332                         EBC_TOLOWER(dest, len);
 333                 EBCASC(dest, len);
 334         }
 335         dest[len] = 0;
 336
 337         return len;
 338 }
 339
 340 size_t append_ipl_vmparm(char *dest, size_t size)
 341 {
 342         size_t rc;
 343
 344         rc = 0;
 345         if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
 346                 rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
 347         else
 348                 dest[0] = 0;
 349         return rc;
 350 }
 351
 352 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
 353                                 struct kobj_attribute *attr, char *page)
 354 {
 355         char parm[DIAG308_VMPARM_SIZE + 1] = {};
 356
 357         append_ipl_vmparm(parm, sizeof(parm));
 358         return sprintf(page, "%s\n", parm);
 359 }
 360
 361 static size_t scpdata_length(const char* buf, size_t count)
 362 {
 363         while (count) {
 364                 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
 365                         break;
 366                 count--;
 367         }
 368         return count;
 369 }
 370
 371 static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
 372                                          const struct ipl_parameter_block *ipb)
 373 {
 374         size_t count;
 375         size_t i;
 376         int has_lowercase;
 377
 378         count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
 379                                              ipb->ipl_info.fcp.scp_data_len));
 380         if (!count)
 381                 goto out;
 382
 383         has_lowercase = 0;
 384         for (i = 0; i < count; i++) {
 385                 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
 386                         count = 0;
 387                         goto out;
 388                 }
 389                 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
 390                         has_lowercase = 1;
 391         }
 392
 393         if (has_lowercase)
 394                 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
 395         else
 396                 for (i = 0; i < count; i++)
 397                         dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
 398 out:
 399         dest[count] = '\0';
 400         return count;
 401 }
 402
 403 size_t append_ipl_scpdata(char *dest, size_t len)
 404 {
 405         size_t rc;
 406
 407         rc = 0;
 408         if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
 409                 rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
 410         else
 411                 dest[0] = 0;
 412         return rc;
 413 }
 414
 415
 416 static struct kobj_attribute sys_ipl_vm_parm_attr =
 417         __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
 418
 419 static ssize_t sys_ipl_device_show(struct kobject *kobj,
 420                                    struct kobj_attribute *attr, char *page)
 421 {
 422         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 423
 424         switch (ipl_info.type) {
 425         case IPL_TYPE_CCW:
 426                 return sprintf(page, "0.%x.%04x\n", ipl_ssid, ipl_devno);
 427         case IPL_TYPE_FCP:
 428         case IPL_TYPE_FCP_DUMP:
 429                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 430         default:
 431                 return 0;
 432         }
 433 }
 434
 435 static struct kobj_attribute sys_ipl_device_attr =
 436         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 437
 438 static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
 439                                   struct bin_attribute *attr, char *buf,
 440                                   loff_t off, size_t count)
 441 {
 442         return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
 443                                         IPL_PARMBLOCK_SIZE);
 444 }
 445 static struct bin_attribute ipl_parameter_attr =
 446         __BIN_ATTR(binary_parameter, S_IRUGO, ipl_parameter_read, NULL,
 447                    PAGE_SIZE);
 448
 449 static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
 450                                  struct bin_attribute *attr, char *buf,
 451                                  loff_t off, size_t count)
 452 {
 453         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 454         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 455
 456         return memory_read_from_buffer(buf, count, &off, scp_data, size);
 457 }
 458 static struct bin_attribute ipl_scp_data_attr =
 459         __BIN_ATTR(scp_data, S_IRUGO, ipl_scp_data_read, NULL, PAGE_SIZE);
 460
 461 static struct bin_attribute *ipl_fcp_bin_attrs[] = {
 462         &ipl_parameter_attr,
 463         &ipl_scp_data_attr,
 464         NULL,
 465 };
 466
 467 /* FCP ipl device attributes */
 468
 469 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 470                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 471 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 472                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 473 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 474                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 475 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 476                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 477
 478 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
 479                                      struct kobj_attribute *attr, char *page)
 480 {
 481         char loadparm[LOADPARM_LEN + 1] = {};
 482
 483         if (!sclp_ipl_info.is_valid)
 484                 return sprintf(page, "#unknown#\n");
 485         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
 486         EBCASC(loadparm, LOADPARM_LEN);
 487         strim(loadparm);
 488         return sprintf(page, "%s\n", loadparm);
 489 }
 490
 491 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
 492         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 493
 494 static struct attribute *ipl_fcp_attrs[] = {
 495         &sys_ipl_type_attr.attr,
 496         &sys_ipl_device_attr.attr,
 497         &sys_ipl_fcp_wwpn_attr.attr,
 498         &sys_ipl_fcp_lun_attr.attr,
 499         &sys_ipl_fcp_bootprog_attr.attr,
 500         &sys_ipl_fcp_br_lba_attr.attr,
 501         &sys_ipl_ccw_loadparm_attr.attr,
 502         NULL,
 503 };
 504
 505 static struct attribute_group ipl_fcp_attr_group = {
 506         .attrs = ipl_fcp_attrs,
 507         .bin_attrs = ipl_fcp_bin_attrs,
 508 };
 509
 510 /* CCW ipl device attributes */
 511
 512 static struct attribute *ipl_ccw_attrs_vm[] = {
 513         &sys_ipl_type_attr.attr,
 514         &sys_ipl_device_attr.attr,
 515         &sys_ipl_ccw_loadparm_attr.attr,
 516         &sys_ipl_vm_parm_attr.attr,
 517         NULL,
 518 };
 519
 520 static struct attribute *ipl_ccw_attrs_lpar[] = {
 521         &sys_ipl_type_attr.attr,
 522         &sys_ipl_device_attr.attr,
 523         &sys_ipl_ccw_loadparm_attr.attr,
 524         NULL,
 525 };
 526
 527 static struct attribute_group ipl_ccw_attr_group_vm = {
 528         .attrs = ipl_ccw_attrs_vm,
 529 };
 530
 531 static struct attribute_group ipl_ccw_attr_group_lpar = {
 532         .attrs = ipl_ccw_attrs_lpar
 533 };
 534
 535 /* NSS ipl device attributes */
 536
 537 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
 538
 539 static struct attribute *ipl_nss_attrs[] = {
 540         &sys_ipl_type_attr.attr,
 541         &sys_ipl_nss_name_attr.attr,
 542         &sys_ipl_ccw_loadparm_attr.attr,
 543         &sys_ipl_vm_parm_attr.attr,
 544         NULL,
 545 };
 546
 547 static struct attribute_group ipl_nss_attr_group = {
 548         .attrs = ipl_nss_attrs,
 549 };
 550
 551 /* UNKNOWN ipl device attributes */
 552
 553 static struct attribute *ipl_unknown_attrs[] = {
 554         &sys_ipl_type_attr.attr,
 555         NULL,
 556 };
 557
 558 static struct attribute_group ipl_unknown_attr_group = {
 559         .attrs = ipl_unknown_attrs,
 560 };
 561
 562 static struct kset *ipl_kset;
 563
 564 static void __ipl_run(void *unused)
 565 {
 566         __bpon();
 567         diag308(DIAG308_IPL, NULL);
 568         if (MACHINE_IS_VM)
 569                 __cpcmd("IPL", NULL, 0, NULL);
 570         else if (ipl_info.type == IPL_TYPE_CCW)
 571                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
 572 }
 573
 574 static void ipl_run(struct shutdown_trigger *trigger)
 575 {
 576         smp_call_ipl_cpu(__ipl_run, NULL);
 577 }
 578
 579 static int __init ipl_init(void)
 580 {
 581         int rc;
 582
 583         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
 584         if (!ipl_kset) {
 585                 rc = -ENOMEM;
 586                 goto out;
 587         }
 588         switch (ipl_info.type) {
 589         case IPL_TYPE_CCW:
 590                 if (MACHINE_IS_VM)
 591                         rc = sysfs_create_group(&ipl_kset->kobj,
 592                                                 &ipl_ccw_attr_group_vm);
 593                 else
 594                         rc = sysfs_create_group(&ipl_kset->kobj,
 595                                                 &ipl_ccw_attr_group_lpar);
 596                 break;
 597         case IPL_TYPE_FCP:
 598         case IPL_TYPE_FCP_DUMP:
 599                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 600                 break;
 601         case IPL_TYPE_NSS:
 602                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
 603                 break;
 604         default:
 605                 rc = sysfs_create_group(&ipl_kset->kobj,
 606                                         &ipl_unknown_attr_group);
 607                 break;
 608         }
 609 out:
 610         if (rc)
 611                 panic("ipl_init failed: rc = %i\n", rc);
 612
 613         return 0;
 614 }
 615
 616 static struct shutdown_action __refdata ipl_action = {
 617         .name   = SHUTDOWN_ACTION_IPL_STR,
 618         .fn     = ipl_run,
 619         .init   = ipl_init,
 620 };
 621
 622 /*
 623  * reipl shutdown action: Reboot Linux on shutdown.
 624  */
 625
 626 /* VM IPL PARM attributes */
 627 static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
 628                                           char *page)
 629 {
 630         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
 631
 632         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
 633         return sprintf(page, "%s\n", vmparm);
 634 }
 635
 636 static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
 637                                           size_t vmparm_max,
 638                                           const char *buf, size_t len)
 639 {
 640         int i, ip_len;
 641
 642         /* ignore trailing newline */
 643         ip_len = len;
 644         if ((len > 0) && (buf[len - 1] == '\n'))
 645                 ip_len--;
 646
 647         if (ip_len > vmparm_max)
 648                 return -EINVAL;
 649
 650         /* parm is used to store kernel options, check for common chars */
 651         for (i = 0; i < ip_len; i++)
 652                 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
 653                         return -EINVAL;
 654
 655         memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
 656         ipb->ipl_info.ccw.vm_parm_len = ip_len;
 657         if (ip_len > 0) {
 658                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
 659                 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
 660                 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
 661         } else {
 662                 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
 663         }
 664
 665         return len;
 666 }
 667
 668 /* NSS wrapper */
 669 static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
 670                                      struct kobj_attribute *attr, char *page)
 671 {
 672         return reipl_generic_vmparm_show(reipl_block_nss, page);
 673 }
 674
 675 static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
 676                                       struct kobj_attribute *attr,
 677                                       const char *buf, size_t len)
 678 {
 679         return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
 680 }
 681
 682 /* CCW wrapper */
 683 static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
 684                                      struct kobj_attribute *attr, char *page)
 685 {
 686         return reipl_generic_vmparm_show(reipl_block_ccw, page);
 687 }
 688
 689 static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
 690                                       struct kobj_attribute *attr,
 691                                       const char *buf, size_t len)
 692 {
 693         return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
 694 }
 695
 696 static struct kobj_attribute sys_reipl_nss_vmparm_attr =
 697         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
 698                                         reipl_nss_vmparm_store);
 699 static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
 700         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
 701                                         reipl_ccw_vmparm_store);
 702
 703 /* FCP reipl device attributes */
 704
 705 static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
 706                                       struct bin_attribute *attr,
 707                                       char *buf, loff_t off, size_t count)
 708 {
 709         size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
 710         void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;
 711
 712         return memory_read_from_buffer(buf, count, &off, scp_data, size);
 713 }
 714
 715 static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
 716                                        struct bin_attribute *attr,
 717                                        char *buf, loff_t off, size_t count)
 718 {
 719         size_t scpdata_len = count;
 720         size_t padding;
 721
 722
 723         if (off)
 724                 return -EINVAL;
 725
 726         memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf, count);
 727         if (scpdata_len % 8) {
 728                 padding = 8 - (scpdata_len % 8);
 729                 memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
 730                        0, padding);
 731                 scpdata_len += padding;
 732         }
 733
 734         reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
 735         reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
 736         reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;
 737
 738         return count;
 739 }
 740 static struct bin_attribute sys_reipl_fcp_scp_data_attr =
 741         __BIN_ATTR(scp_data, (S_IRUGO | S_IWUSR), reipl_fcp_scpdata_read,
 742                    reipl_fcp_scpdata_write, DIAG308_SCPDATA_SIZE);
 743
 744 static struct bin_attribute *reipl_fcp_bin_attrs[] = {
 745         &sys_reipl_fcp_scp_data_attr,
 746         NULL,
 747 };
 748
 749 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%llx\n",
 750                    reipl_block_fcp->ipl_info.fcp.wwpn);
 751 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%llx\n",
 752                    reipl_block_fcp->ipl_info.fcp.lun);
 753 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 754                    reipl_block_fcp->ipl_info.fcp.bootprog);
 755 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 756                    reipl_block_fcp->ipl_info.fcp.br_lba);
 757 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 758                    reipl_block_fcp->ipl_info.fcp.devno);
 759
 760 static void reipl_get_ascii_loadparm(char *loadparm,
 761                                      struct ipl_parameter_block *ibp)
 762 {
 763         memcpy(loadparm, ibp->hdr.loadparm, LOADPARM_LEN);
 764         EBCASC(loadparm, LOADPARM_LEN);
 765         loadparm[LOADPARM_LEN] = 0;
 766         strim(loadparm);
 767 }
 768
 769 static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
 770                                            char *page)
 771 {
 772         char buf[LOADPARM_LEN + 1];
 773
 774         reipl_get_ascii_loadparm(buf, ipb);
 775         return sprintf(page, "%s\n", buf);
 776 }
 777
 778 static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
 779                                             const char *buf, size_t len)
 780 {
 781         int i, lp_len;
 782
 783         /* ignore trailing newline */
 784         lp_len = len;
 785         if ((len > 0) && (buf[len - 1] == '\n'))
 786                 lp_len--;
 787         /* loadparm can have max 8 characters and must not start with a blank */
 788         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 789                 return -EINVAL;
 790         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 791         for (i = 0; i < lp_len; i++) {
 792                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 793                     (buf[i] == '.'))
 794                         continue;
 795                 return -EINVAL;
 796         }
 797         /* initialize loadparm with blanks */
 798         memset(ipb->hdr.loadparm, ' ', LOADPARM_LEN);
 799         /* copy and convert to ebcdic */
 800         memcpy(ipb->hdr.loadparm, buf, lp_len);
 801         ASCEBC(ipb->hdr.loadparm, LOADPARM_LEN);
 802         ipb->hdr.flags |= DIAG308_FLAGS_LP_VALID;
 803         return len;
 804 }
 805
 806 /* FCP wrapper */
 807 static ssize_t reipl_fcp_loadparm_show(struct kobject *kobj,
 808                                        struct kobj_attribute *attr, char *page)
 809 {
 810         return reipl_generic_loadparm_show(reipl_block_fcp, page);
 811 }
 812
 813 static ssize_t reipl_fcp_loadparm_store(struct kobject *kobj,
 814                                         struct kobj_attribute *attr,
 815                                         const char *buf, size_t len)
 816 {
 817         return reipl_generic_loadparm_store(reipl_block_fcp, buf, len);
 818 }
 819
 820 static struct kobj_attribute sys_reipl_fcp_loadparm_attr =
 821         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_fcp_loadparm_show,
 822                                             reipl_fcp_loadparm_store);
 823
 824 static struct attribute *reipl_fcp_attrs[] = {
 825         &sys_reipl_fcp_device_attr.attr,
 826         &sys_reipl_fcp_wwpn_attr.attr,
 827         &sys_reipl_fcp_lun_attr.attr,
 828         &sys_reipl_fcp_bootprog_attr.attr,
 829         &sys_reipl_fcp_br_lba_attr.attr,
 830         &sys_reipl_fcp_loadparm_attr.attr,
 831         NULL,
 832 };
 833
 834 static struct attribute_group reipl_fcp_attr_group = {
 835         .attrs = reipl_fcp_attrs,
 836         .bin_attrs = reipl_fcp_bin_attrs,
 837 };
 838
 839 /* CCW reipl device attributes */
 840 DEFINE_IPL_CCW_ATTR_RW(reipl_ccw, device, reipl_block_ccw->ipl_info.ccw);
 841
 842 /* NSS wrapper */
 843 static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
 844                                        struct kobj_attribute *attr, char *page)
 845 {
 846         return reipl_generic_loadparm_show(reipl_block_nss, page);
 847 }
 848
 849 static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
 850                                         struct kobj_attribute *attr,
 851                                         const char *buf, size_t len)
 852 {
 853         return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
 854 }
 855
 856 /* CCW wrapper */
 857 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
 858                                        struct kobj_attribute *attr, char *page)
 859 {
 860         return reipl_generic_loadparm_show(reipl_block_ccw, page);
 861 }
 862
 863 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
 864                                         struct kobj_attribute *attr,
 865                                         const char *buf, size_t len)
 866 {
 867         return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
 868 }
 869
 870 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
 871         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
 872                                             reipl_ccw_loadparm_store);
 873
 874 static struct attribute *reipl_ccw_attrs_vm[] = {
 875         &sys_reipl_ccw_device_attr.attr,
 876         &sys_reipl_ccw_loadparm_attr.attr,
 877         &sys_reipl_ccw_vmparm_attr.attr,
 878         NULL,
 879 };
 880
 881 static struct attribute *reipl_ccw_attrs_lpar[] = {
 882         &sys_reipl_ccw_device_attr.attr,
 883         &sys_reipl_ccw_loadparm_attr.attr,
 884         NULL,
 885 };
 886
 887 static struct attribute_group reipl_ccw_attr_group_vm = {
 888         .name  = IPL_CCW_STR,
 889         .attrs = reipl_ccw_attrs_vm,
 890 };
 891
 892 static struct attribute_group reipl_ccw_attr_group_lpar = {
 893         .name  = IPL_CCW_STR,
 894         .attrs = reipl_ccw_attrs_lpar,
 895 };
 896
 897
 898 /* NSS reipl device attributes */
 899 static void reipl_get_ascii_nss_name(char *dst,
 900                                      struct ipl_parameter_block *ipb)
 901 {
 902         memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
 903         EBCASC(dst, NSS_NAME_SIZE);
 904         dst[NSS_NAME_SIZE] = 0;
 905 }
 906
 907 static ssize_t reipl_nss_name_show(struct kobject *kobj,
 908                                    struct kobj_attribute *attr, char *page)
 909 {
 910         char nss_name[NSS_NAME_SIZE + 1] = {};
 911
 912         reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
 913         return sprintf(page, "%s\n", nss_name);
 914 }
 915
 916 static ssize_t reipl_nss_name_store(struct kobject *kobj,
 917                                     struct kobj_attribute *attr,
 918                                     const char *buf, size_t len)
 919 {
 920         int nss_len;
 921
 922         /* ignore trailing newline */
 923         nss_len = len;
 924         if ((len > 0) && (buf[len - 1] == '\n'))
 925                 nss_len--;
 926
 927         if (nss_len > NSS_NAME_SIZE)
 928                 return -EINVAL;
 929
 930         memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
 931         if (nss_len > 0) {
 932                 reipl_block_nss->ipl_info.ccw.vm_flags |=
 933                         DIAG308_VM_FLAGS_NSS_VALID;
 934                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
 935                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
 936                 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
 937         } else {
 938                 reipl_block_nss->ipl_info.ccw.vm_flags &=
 939                         ~DIAG308_VM_FLAGS_NSS_VALID;
 940         }
 941
 942         return len;
 943 }
 944
 945 static struct kobj_attribute sys_reipl_nss_name_attr =
 946         __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
 947                                         reipl_nss_name_store);
 948
 949 static struct kobj_attribute sys_reipl_nss_loadparm_attr =
 950         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
 951                                             reipl_nss_loadparm_store);
 952
 953 static struct attribute *reipl_nss_attrs[] = {
 954         &sys_reipl_nss_name_attr.attr,
 955         &sys_reipl_nss_loadparm_attr.attr,
 956         &sys_reipl_nss_vmparm_attr.attr,
 957         NULL,
 958 };
 959
 960 static struct attribute_group reipl_nss_attr_group = {
 961         .name  = IPL_NSS_STR,
 962         .attrs = reipl_nss_attrs,
 963 };
 964
 965 static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
 966 {
 967         reipl_block_actual = reipl_block;
 968         os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
 969                           reipl_block->hdr.len);
 970 }
 971
 972 /* reipl type */
 973
 974 static int reipl_set_type(enum ipl_type type)
 975 {
 976         if (!(reipl_capabilities & type))
 977                 return -EINVAL;
 978
 979         switch(type) {
 980         case IPL_TYPE_CCW:
 981                 if (diag308_set_works)
 982                         reipl_method = REIPL_METHOD_CCW_DIAG;
 983                 else if (MACHINE_IS_VM)
 984                         reipl_method = REIPL_METHOD_CCW_VM;
 985                 else
 986                         reipl_method = REIPL_METHOD_CCW_CIO;
 987                 set_reipl_block_actual(reipl_block_ccw);
 988                 break;
 989         case IPL_TYPE_FCP:
 990                 if (diag308_set_works)
 991                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
 992                 else if (MACHINE_IS_VM)
 993                         reipl_method = REIPL_METHOD_FCP_RO_VM;
 994                 else
 995                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
 996                 set_reipl_block_actual(reipl_block_fcp);
 997                 break;
 998         case IPL_TYPE_FCP_DUMP:
 999                 reipl_method = REIPL_METHOD_FCP_DUMP;
1000                 break;
1001         case IPL_TYPE_NSS:
1002                 if (diag308_set_works)
1003                         reipl_method = REIPL_METHOD_NSS_DIAG;
1004                 else
1005                         reipl_method = REIPL_METHOD_NSS;
1006                 set_reipl_block_actual(reipl_block_nss);
1007                 break;
1008         case IPL_TYPE_UNKNOWN:
1009                 reipl_method = REIPL_METHOD_DEFAULT;
1010                 break;
1011         default:
1012                 BUG();
1013         }
1014         reipl_type = type;
1015         return 0;
1016 }
1017
1018 static ssize_t reipl_type_show(struct kobject *kobj,
1019                                struct kobj_attribute *attr, char *page)
1020 {
1021         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
1022 }
1023
1024 static ssize_t reipl_type_store(struct kobject *kobj,
1025                                 struct kobj_attribute *attr,
1026                                 const char *buf, size_t len)
1027 {
1028         int rc = -EINVAL;
1029
1030         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
1031                 rc = reipl_set_type(IPL_TYPE_CCW);
1032         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
1033                 rc = reipl_set_type(IPL_TYPE_FCP);
1034         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
1035                 rc = reipl_set_type(IPL_TYPE_NSS);
1036         return (rc != 0) ? rc : len;
1037 }
1038
1039 static struct kobj_attribute reipl_type_attr =
1040         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
1041
1042 static struct kset *reipl_kset;
1043 static struct kset *reipl_fcp_kset;
1044
1045 static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
1046                            const enum ipl_method m)
1047 {
1048         char loadparm[LOADPARM_LEN + 1] = {};
1049         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
1050         char nss_name[NSS_NAME_SIZE + 1] = {};
1051         size_t pos = 0;
1052
1053         reipl_get_ascii_loadparm(loadparm, ipb);
1054         reipl_get_ascii_nss_name(nss_name, ipb);
1055         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
1056
1057         switch (m) {
1058         case REIPL_METHOD_CCW_VM:
1059                 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
1060                 break;
1061         case REIPL_METHOD_NSS:
1062                 pos = sprintf(dst, "IPL %s", nss_name);
1063                 break;
1064         default:
1065                 break;
1066         }
1067         if (strlen(loadparm) > 0)
1068                 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
1069         if (strlen(vmparm) > 0)
1070                 sprintf(dst + pos, " PARM %s", vmparm);
1071 }
1072
1073 static void __reipl_run(void *unused)
1074 {
1075         struct ccw_dev_id devid;
1076         static char buf[128];
1077
1078         switch (reipl_method) {
1079         case REIPL_METHOD_CCW_CIO:
1080                 devid.ssid  = reipl_block_ccw->ipl_info.ccw.ssid;
1081                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
1082                 reipl_ccw_dev(&devid);
1083                 break;
1084         case REIPL_METHOD_CCW_VM:
1085                 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
1086                 __cpcmd(buf, NULL, 0, NULL);
1087                 break;
1088         case REIPL_METHOD_CCW_DIAG:
1089                 diag308(DIAG308_SET, reipl_block_ccw);
1090                 diag308(DIAG308_IPL, NULL);
1091                 break;
1092         case REIPL_METHOD_FCP_RW_DIAG:
1093                 diag308(DIAG308_SET, reipl_block_fcp);
1094                 diag308(DIAG308_IPL, NULL);
1095                 break;
1096         case REIPL_METHOD_FCP_RO_DIAG:
1097                 diag308(DIAG308_IPL, NULL);
1098                 break;
1099         case REIPL_METHOD_FCP_RO_VM:
1100                 __cpcmd("IPL", NULL, 0, NULL);
1101                 break;
1102         case REIPL_METHOD_NSS_DIAG:
1103                 diag308(DIAG308_SET, reipl_block_nss);
1104                 diag308(DIAG308_IPL, NULL);
1105                 break;
1106         case REIPL_METHOD_NSS:
1107                 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
1108                 __cpcmd(buf, NULL, 0, NULL);
1109                 break;
1110         case REIPL_METHOD_DEFAULT:
1111                 if (MACHINE_IS_VM)
1112                         __cpcmd("IPL", NULL, 0, NULL);
1113                 diag308(DIAG308_IPL, NULL);
1114                 break;
1115         case REIPL_METHOD_FCP_DUMP:
1116                 break;
1117         }
1118         disabled_wait((unsigned long) __builtin_return_address(0));
1119 }
1120
1121 static void reipl_run(struct shutdown_trigger *trigger)
1122 {
1123         smp_call_ipl_cpu(__reipl_run, NULL);
1124 }
1125
1126 static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
1127 {
1128         ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
1129         ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
1130         ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1131         ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1132 }
1133
1134 static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
1135 {
1136         /* LOADPARM */
1137         /* check if read scp info worked and set loadparm */
1138         if (sclp_ipl_info.is_valid)
1139                 memcpy(ipb->hdr.loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
1140         else
1141                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
1142                 memset(ipb->hdr.loadparm, 0x40, LOADPARM_LEN);
1143         ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
1144
1145         /* VM PARM */
1146         if (MACHINE_IS_VM && diag308_set_works &&
1147             (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
1148
1149                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
1150                 ipb->ipl_info.ccw.vm_parm_len =
1151                                         ipl_block.ipl_info.ccw.vm_parm_len;
1152                 memcpy(ipb->ipl_info.ccw.vm_parm,
1153                        ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
1154         }
1155 }
1156
1157 static int __init reipl_nss_init(void)
1158 {
1159         int rc;
1160
1161         if (!MACHINE_IS_VM)
1162                 return 0;
1163
1164         reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1165         if (!reipl_block_nss)
1166                 return -ENOMEM;
1167
1168         if (!diag308_set_works)
1169                 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1170
1171         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1172         if (rc)
1173                 return rc;
1174
1175         reipl_block_ccw_init(reipl_block_nss);
1176         if (ipl_info.type == IPL_TYPE_NSS) {
1177                 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1178                         ' ', NSS_NAME_SIZE);
1179                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1180                         kernel_nss_name, strlen(kernel_nss_name));
1181                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1182                 reipl_block_nss->ipl_info.ccw.vm_flags |=
1183                         DIAG308_VM_FLAGS_NSS_VALID;
1184
1185                 reipl_block_ccw_fill_parms(reipl_block_nss);
1186         }
1187
1188         reipl_capabilities |= IPL_TYPE_NSS;
1189         return 0;
1190 }
1191
1192 static int __init reipl_ccw_init(void)
1193 {
1194         int rc;
1195
1196         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1197         if (!reipl_block_ccw)
1198                 return -ENOMEM;
1199
1200         if (MACHINE_IS_VM) {
1201                 if (!diag308_set_works)
1202                         sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1203                 rc = sysfs_create_group(&reipl_kset->kobj,
1204                                         &reipl_ccw_attr_group_vm);
1205         } else {
1206                 if(!diag308_set_works)
1207                         sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1208                 rc = sysfs_create_group(&reipl_kset->kobj,
1209                                         &reipl_ccw_attr_group_lpar);
1210         }
1211         if (rc)
1212                 return rc;
1213
1214         reipl_block_ccw_init(reipl_block_ccw);
1215         if (ipl_info.type == IPL_TYPE_CCW) {
1216                 reipl_block_ccw->ipl_info.ccw.ssid = ipl_ssid;
1217                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1218                 reipl_block_ccw_fill_parms(reipl_block_ccw);
1219         }
1220
1221         reipl_capabilities |= IPL_TYPE_CCW;
1222         return 0;
1223 }
1224
1225 static int __init reipl_fcp_init(void)
1226 {
1227         int rc;
1228
1229         if (!diag308_set_works) {
1230                 if (ipl_info.type == IPL_TYPE_FCP) {
1231                         make_attrs_ro(reipl_fcp_attrs);
1232                         sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
1233                 } else
1234                         return 0;
1235         }
1236
1237         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1238         if (!reipl_block_fcp)
1239                 return -ENOMEM;
1240
1241         /* sysfs: create fcp kset for mixing attr group and bin attrs */
1242         reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1243                                              &reipl_kset->kobj);
1244         if (!reipl_fcp_kset) {
1245                 free_page((unsigned long) reipl_block_fcp);
1246                 return -ENOMEM;
1247         }
1248
1249         rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1250         if (rc) {
1251                 kset_unregister(reipl_fcp_kset);
1252                 free_page((unsigned long) reipl_block_fcp);
1253                 return rc;
1254         }
1255
1256         if (ipl_info.type == IPL_TYPE_FCP) {
1257                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1258                 /*
1259                  * Fix loadparm: There are systems where the (SCSI) LOADPARM
1260                  * is invalid in the SCSI IPL parameter block, so take it
1261                  * always from sclp_ipl_info.
1262                  */
1263                 memcpy(reipl_block_fcp->hdr.loadparm, sclp_ipl_info.loadparm,
1264                        LOADPARM_LEN);
1265         } else {
1266                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1267                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1268                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1269                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1270                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1271         }
1272         reipl_capabilities |= IPL_TYPE_FCP;
1273         return 0;
1274 }
1275
1276 static int __init reipl_type_init(void)
1277 {
1278         enum ipl_type reipl_type = ipl_info.type;
1279         struct ipl_parameter_block *reipl_block;
1280         unsigned long size;
1281
1282         reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
1283         if (!reipl_block)
1284                 goto out;
1285         /*
1286          * If we have an OS info reipl block, this will be used
1287          */
1288         if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) {
1289                 memcpy(reipl_block_fcp, reipl_block, size);
1290                 reipl_type = IPL_TYPE_FCP;
1291         } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) {
1292                 memcpy(reipl_block_ccw, reipl_block, size);
1293                 reipl_type = IPL_TYPE_CCW;
1294         }
1295 out:
1296         return reipl_set_type(reipl_type);
1297 }
1298
1299 static int __init reipl_init(void)
1300 {
1301         int rc;
1302
1303         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1304         if (!reipl_kset)
1305                 return -ENOMEM;
1306         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1307         if (rc) {
1308                 kset_unregister(reipl_kset);
1309                 return rc;
1310         }
1311         rc = reipl_ccw_init();
1312         if (rc)
1313                 return rc;
1314         rc = reipl_fcp_init();
1315         if (rc)
1316                 return rc;
1317         rc = reipl_nss_init();
1318         if (rc)
1319                 return rc;
1320         return reipl_type_init();
1321 }
1322
1323 static struct shutdown_action __refdata reipl_action = {
1324         .name   = SHUTDOWN_ACTION_REIPL_STR,
1325         .fn     = reipl_run,
1326         .init   = reipl_init,
1327 };
1328
1329 /*
1330  * dump shutdown action: Dump Linux on shutdown.
1331  */
1332
1333 /* FCP dump device attributes */
1334
1335 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%llx\n",
1336                    dump_block_fcp->ipl_info.fcp.wwpn);
1337 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%llx\n",
1338                    dump_block_fcp->ipl_info.fcp.lun);
1339 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1340                    dump_block_fcp->ipl_info.fcp.bootprog);
1341 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1342                    dump_block_fcp->ipl_info.fcp.br_lba);
1343 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1344                    dump_block_fcp->ipl_info.fcp.devno);
1345
1346 static struct attribute *dump_fcp_attrs[] = {
1347         &sys_dump_fcp_device_attr.attr,
1348         &sys_dump_fcp_wwpn_attr.attr,
1349         &sys_dump_fcp_lun_attr.attr,
1350         &sys_dump_fcp_bootprog_attr.attr,
1351         &sys_dump_fcp_br_lba_attr.attr,
1352         NULL,
1353 };
1354
1355 static struct attribute_group dump_fcp_attr_group = {
1356         .name  = IPL_FCP_STR,
1357         .attrs = dump_fcp_attrs,
1358 };
1359
1360 /* CCW dump device attributes */
1361 DEFINE_IPL_CCW_ATTR_RW(dump_ccw, device, dump_block_ccw->ipl_info.ccw);
1362
1363 static struct attribute *dump_ccw_attrs[] = {
1364         &sys_dump_ccw_device_attr.attr,
1365         NULL,
1366 };
1367
1368 static struct attribute_group dump_ccw_attr_group = {
1369         .name  = IPL_CCW_STR,
1370         .attrs = dump_ccw_attrs,
1371 };
1372
1373 /* dump type */
1374
1375 static int dump_set_type(enum dump_type type)
1376 {
1377         if (!(dump_capabilities & type))
1378                 return -EINVAL;
1379         switch (type) {
1380         case DUMP_TYPE_CCW:
1381                 if (diag308_set_works)
1382                         dump_method = DUMP_METHOD_CCW_DIAG;
1383                 else if (MACHINE_IS_VM)
1384                         dump_method = DUMP_METHOD_CCW_VM;
1385                 else
1386                         dump_method = DUMP_METHOD_CCW_CIO;
1387                 break;
1388         case DUMP_TYPE_FCP:
1389                 dump_method = DUMP_METHOD_FCP_DIAG;
1390                 break;
1391         default:
1392                 dump_method = DUMP_METHOD_NONE;
1393         }
1394         dump_type = type;
1395         return 0;
1396 }
1397
1398 static ssize_t dump_type_show(struct kobject *kobj,
1399                               struct kobj_attribute *attr, char *page)
1400 {
1401         return sprintf(page, "%s\n", dump_type_str(dump_type));
1402 }
1403
1404 static ssize_t dump_type_store(struct kobject *kobj,
1405                                struct kobj_attribute *attr,
1406                                const char *buf, size_t len)
1407 {
1408         int rc = -EINVAL;
1409
1410         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1411                 rc = dump_set_type(DUMP_TYPE_NONE);
1412         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1413                 rc = dump_set_type(DUMP_TYPE_CCW);
1414         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1415                 rc = dump_set_type(DUMP_TYPE_FCP);
1416         return (rc != 0) ? rc : len;
1417 }
1418
1419 static struct kobj_attribute dump_type_attr =
1420         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1421
1422 static struct kset *dump_kset;
1423
1424 static void diag308_dump(void *dump_block)
1425 {
1426         diag308(DIAG308_SET, dump_block);
1427         while (1) {
1428                 if (diag308(DIAG308_DUMP, NULL) != 0x302)
1429                         break;
1430                 udelay_simple(USEC_PER_SEC);
1431         }
1432 }
1433
1434 static void __dump_run(void *unused)
1435 {
1436         struct ccw_dev_id devid;
1437         static char buf[100];
1438
1439         switch (dump_method) {
1440         case DUMP_METHOD_CCW_CIO:
1441                 devid.ssid  = dump_block_ccw->ipl_info.ccw.ssid;
1442                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1443                 reipl_ccw_dev(&devid);
1444                 break;
1445         case DUMP_METHOD_CCW_VM:
1446                 sprintf(buf, "STORE STATUS");
1447                 __cpcmd(buf, NULL, 0, NULL);
1448                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1449                 __cpcmd(buf, NULL, 0, NULL);
1450                 break;
1451         case DUMP_METHOD_CCW_DIAG:
1452                 diag308_dump(dump_block_ccw);
1453                 break;
1454         case DUMP_METHOD_FCP_DIAG:
1455                 diag308_dump(dump_block_fcp);
1456                 break;
1457         default:
1458                 break;
1459         }
1460 }
1461
1462 static void dump_run(struct shutdown_trigger *trigger)
1463 {
1464         if (dump_method == DUMP_METHOD_NONE)
1465                 return;
1466         smp_send_stop();
1467         smp_call_ipl_cpu(__dump_run, NULL);
1468 }
1469
1470 static int __init dump_ccw_init(void)
1471 {
1472         int rc;
1473
1474         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1475         if (!dump_block_ccw)
1476                 return -ENOMEM;
1477         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1478         if (rc) {
1479                 free_page((unsigned long)dump_block_ccw);
1480                 return rc;
1481         }
1482         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1483         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1484         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1485         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1486         dump_capabilities |= DUMP_TYPE_CCW;
1487         return 0;
1488 }
1489
1490 static int __init dump_fcp_init(void)
1491 {
1492         int rc;
1493
1494         if (!sclp_ipl_info.has_dump)
1495                 return 0; /* LDIPL DUMP is not installed */
1496         if (!diag308_set_works)
1497                 return 0;
1498         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1499         if (!dump_block_fcp)
1500                 return -ENOMEM;
1501         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1502         if (rc) {
1503                 free_page((unsigned long)dump_block_fcp);
1504                 return rc;
1505         }
1506         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1507         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1508         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1509         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1510         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1511         dump_capabilities |= DUMP_TYPE_FCP;
1512         return 0;
1513 }
1514
1515 static int __init dump_init(void)
1516 {
1517         int rc;
1518
1519         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1520         if (!dump_kset)
1521                 return -ENOMEM;
1522         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1523         if (rc) {
1524                 kset_unregister(dump_kset);
1525                 return rc;
1526         }
1527         rc = dump_ccw_init();
1528         if (rc)
1529                 return rc;
1530         rc = dump_fcp_init();
1531         if (rc)
1532                 return rc;
1533         dump_set_type(DUMP_TYPE_NONE);
1534         return 0;
1535 }
1536
1537 static struct shutdown_action __refdata dump_action = {
1538         .name   = SHUTDOWN_ACTION_DUMP_STR,
1539         .fn     = dump_run,
1540         .init   = dump_init,
1541 };
1542
1543 static void dump_reipl_run(struct shutdown_trigger *trigger)
1544 {
1545         unsigned long ipib = (unsigned long) reipl_block_actual;
1546         unsigned int csum;
1547
1548         csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
1549         mem_assign_absolute(S390_lowcore.ipib, ipib);
1550         mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
1551         dump_run(trigger);
1552 }
1553
1554 static int __init dump_reipl_init(void)
1555 {
1556         if (!diag308_set_works)
1557                 return -EOPNOTSUPP;
1558         else
1559                 return 0;
1560 }
1561
1562 static struct shutdown_action __refdata dump_reipl_action = {
1563         .name   = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1564         .fn     = dump_reipl_run,
1565         .init   = dump_reipl_init,
1566 };
1567
1568 /*
1569  * vmcmd shutdown action: Trigger vm command on shutdown.
1570  */
1571
1572 static char vmcmd_on_reboot[128];
1573 static char vmcmd_on_panic[128];
1574 static char vmcmd_on_halt[128];
1575 static char vmcmd_on_poff[128];
1576 static char vmcmd_on_restart[128];
1577
1578 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1579 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1580 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1581 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1582 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1583
1584 static struct attribute *vmcmd_attrs[] = {
1585         &sys_vmcmd_on_reboot_attr.attr,
1586         &sys_vmcmd_on_panic_attr.attr,
1587         &sys_vmcmd_on_halt_attr.attr,
1588         &sys_vmcmd_on_poff_attr.attr,
1589         &sys_vmcmd_on_restart_attr.attr,
1590         NULL,
1591 };
1592
1593 static struct attribute_group vmcmd_attr_group = {
1594         .attrs = vmcmd_attrs,
1595 };
1596
1597 static struct kset *vmcmd_kset;
1598
1599 static void vmcmd_run(struct shutdown_trigger *trigger)
1600 {
1601         char *cmd;
1602
1603         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1604                 cmd = vmcmd_on_reboot;
1605         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1606                 cmd = vmcmd_on_panic;
1607         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1608                 cmd = vmcmd_on_halt;
1609         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1610                 cmd = vmcmd_on_poff;
1611         else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1612                 cmd = vmcmd_on_restart;
1613         else
1614                 return;
1615
1616         if (strlen(cmd) == 0)
1617                 return;
1618         __cpcmd(cmd, NULL, 0, NULL);
1619 }
1620
1621 static int vmcmd_init(void)
1622 {
1623         if (!MACHINE_IS_VM)
1624                 return -EOPNOTSUPP;
1625         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1626         if (!vmcmd_kset)
1627                 return -ENOMEM;
1628         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1629 }
1630
1631 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1632                                               vmcmd_run, vmcmd_init};
1633
1634 /*
1635  * stop shutdown action: Stop Linux on shutdown.
1636  */
1637
1638 static void stop_run(struct shutdown_trigger *trigger)
1639 {
1640         if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1641             strcmp(trigger->name, ON_RESTART_STR) == 0)
1642                 disabled_wait((unsigned long) __builtin_return_address(0));
1643         smp_stop_cpu();
1644 }
1645
1646 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1647                                              stop_run, NULL};
1648
1649 /* action list */
1650
1651 static struct shutdown_action *shutdown_actions_list[] = {
1652         &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1653         &vmcmd_action, &stop_action};
1654 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1655
1656 /*
1657  * Trigger section
1658  */
1659
1660 static struct kset *shutdown_actions_kset;
1661
1662 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1663                        size_t len)
1664 {
1665         int i;
1666
1667         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1668                 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1669                         if (shutdown_actions_list[i]->init_rc) {
1670                                 return shutdown_actions_list[i]->init_rc;
1671                         } else {
1672                                 trigger->action = shutdown_actions_list[i];
1673                                 return len;
1674                         }
1675                 }
1676         }
1677         return -EINVAL;
1678 }
1679
1680 /* on reipl */
1681
1682 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1683                                                     &reipl_action};
1684
1685 static ssize_t on_reboot_show(struct kobject *kobj,
1686                               struct kobj_attribute *attr, char *page)
1687 {
1688         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1689 }
1690
1691 static ssize_t on_reboot_store(struct kobject *kobj,
1692                                struct kobj_attribute *attr,
1693                                const char *buf, size_t len)
1694 {
1695         return set_trigger(buf, &on_reboot_trigger, len);
1696 }
1697 static struct kobj_attribute on_reboot_attr = __ATTR_RW(on_reboot);
1698
1699 static void do_machine_restart(char *__unused)
1700 {
1701         smp_send_stop();
1702         on_reboot_trigger.action->fn(&on_reboot_trigger);
1703         reipl_run(NULL);
1704 }
1705 void (*_machine_restart)(char *command) = do_machine_restart;
1706
1707 /* on panic */
1708
1709 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1710
1711 static ssize_t on_panic_show(struct kobject *kobj,
1712                              struct kobj_attribute *attr, char *page)
1713 {
1714         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1715 }
1716
1717 static ssize_t on_panic_store(struct kobject *kobj,
1718                               struct kobj_attribute *attr,
1719                               const char *buf, size_t len)
1720 {
1721         return set_trigger(buf, &on_panic_trigger, len);
1722 }
1723 static struct kobj_attribute on_panic_attr = __ATTR_RW(on_panic);
1724
1725 static void do_panic(void)
1726 {
1727         lgr_info_log();
1728         on_panic_trigger.action->fn(&on_panic_trigger);
1729         stop_run(&on_panic_trigger);
1730 }
1731
1732 /* on restart */
1733
1734 static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
1735         &stop_action};
1736
1737 static ssize_t on_restart_show(struct kobject *kobj,
1738                                struct kobj_attribute *attr, char *page)
1739 {
1740         return sprintf(page, "%s\n", on_restart_trigger.action->name);
1741 }
1742
1743 static ssize_t on_restart_store(struct kobject *kobj,
1744                                 struct kobj_attribute *attr,
1745                                 const char *buf, size_t len)
1746 {
1747         return set_trigger(buf, &on_restart_trigger, len);
1748 }
1749 static struct kobj_attribute on_restart_attr = __ATTR_RW(on_restart);
1750
1751 static void __do_restart(void *ignore)
1752 {
1753         __arch_local_irq_stosm(0x04); /* enable DAT */
1754         smp_send_stop();
1755 #ifdef CONFIG_CRASH_DUMP
1756         crash_kexec(NULL);
1757 #endif
1758         on_restart_trigger.action->fn(&on_restart_trigger);
1759         stop_run(&on_restart_trigger);
1760 }
1761
1762 void do_restart(void)
1763 {
1764         tracing_off();
1765         debug_locks_off();
1766         lgr_info_log();
1767         smp_call_online_cpu(__do_restart, NULL);
1768 }
1769
1770 /* on halt */
1771
1772 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1773
1774 static ssize_t on_halt_show(struct kobject *kobj,
1775                             struct kobj_attribute *attr, char *page)
1776 {
1777         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1778 }
1779
1780 static ssize_t on_halt_store(struct kobject *kobj,
1781                              struct kobj_attribute *attr,
1782                              const char *buf, size_t len)
1783 {
1784         return set_trigger(buf, &on_halt_trigger, len);
1785 }
1786 static struct kobj_attribute on_halt_attr = __ATTR_RW(on_halt);
1787
1788 static void do_machine_halt(void)
1789 {
1790         smp_send_stop();
1791         on_halt_trigger.action->fn(&on_halt_trigger);
1792         stop_run(&on_halt_trigger);
1793 }
1794 void (*_machine_halt)(void) = do_machine_halt;
1795
1796 /* on power off */
1797
1798 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1799
1800 static ssize_t on_poff_show(struct kobject *kobj,
1801                             struct kobj_attribute *attr, char *page)
1802 {
1803         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1804 }
1805
1806 static ssize_t on_poff_store(struct kobject *kobj,
1807                              struct kobj_attribute *attr,
1808                              const char *buf, size_t len)
1809 {
1810         return set_trigger(buf, &on_poff_trigger, len);
1811 }
1812 static struct kobj_attribute on_poff_attr = __ATTR_RW(on_poff);
1813
1814 static void do_machine_power_off(void)
1815 {
1816         smp_send_stop();
1817         on_poff_trigger.action->fn(&on_poff_trigger);
1818         stop_run(&on_poff_trigger);
1819 }
1820 void (*_machine_power_off)(void) = do_machine_power_off;
1821
1822 static struct attribute *shutdown_action_attrs[] = {
1823         &on_restart_attr.attr,
1824         &on_reboot_attr.attr,
1825         &on_panic_attr.attr,
1826         &on_halt_attr.attr,
1827         &on_poff_attr.attr,
1828         NULL,
1829 };
1830
1831 static struct attribute_group shutdown_action_attr_group = {
1832         .attrs = shutdown_action_attrs,
1833 };
1834
1835 static void __init shutdown_triggers_init(void)
1836 {
1837         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1838                                                     firmware_kobj);
1839         if (!shutdown_actions_kset)
1840                 goto fail;
1841         if (sysfs_create_group(&shutdown_actions_kset->kobj,
1842                                &shutdown_action_attr_group))
1843                 goto fail;
1844         return;
1845 fail:
1846         panic("shutdown_triggers_init failed\n");
1847 }
1848
1849 static void __init shutdown_actions_init(void)
1850 {
1851         int i;
1852
1853         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1854                 if (!shutdown_actions_list[i]->init)
1855                         continue;
1856                 shutdown_actions_list[i]->init_rc =
1857                         shutdown_actions_list[i]->init();
1858         }
1859 }
1860
1861 static int __init s390_ipl_init(void)
1862 {
1863         char str[8] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40};
1864
1865         sclp_get_ipl_info(&sclp_ipl_info);
1866         /*
1867          * Fix loadparm: There are systems where the (SCSI) LOADPARM
1868          * returned by read SCP info is invalid (contains EBCDIC blanks)
1869          * when the system has been booted via diag308. In that case we use
1870          * the value from diag308, if available.
1871          *
1872          * There are also systems where diag308 store does not work in
1873          * case the system is booted from HMC. Fortunately in this case
1874          * READ SCP info provides the correct value.
1875          */
1876         if (memcmp(sclp_ipl_info.loadparm, str, sizeof(str)) == 0 &&
1877             diag308_set_works)
1878                 memcpy(sclp_ipl_info.loadparm, ipl_block.hdr.loadparm,
1879                        LOADPARM_LEN);
1880         shutdown_actions_init();
1881         shutdown_triggers_init();
1882         return 0;
1883 }
1884
1885 __initcall(s390_ipl_init);
1886
1887 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1888 {
1889         int sx, dx;
1890
1891         dx = 0;
1892         for (sx = 0; src[sx] != 0; sx++) {
1893                 if (src[sx] == '"')
1894                         continue;
1895                 dst[dx++] = src[sx];
1896                 if (dx >= n)
1897                         break;
1898         }
1899 }
1900
1901 static int __init vmcmd_on_reboot_setup(char *str)
1902 {
1903         if (!MACHINE_IS_VM)
1904                 return 1;
1905         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1906         vmcmd_on_reboot[127] = 0;
1907         on_reboot_trigger.action = &vmcmd_action;
1908         return 1;
1909 }
1910 __setup("vmreboot=", vmcmd_on_reboot_setup);
1911
1912 static int __init vmcmd_on_panic_setup(char *str)
1913 {
1914         if (!MACHINE_IS_VM)
1915                 return 1;
1916         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1917         vmcmd_on_panic[127] = 0;
1918         on_panic_trigger.action = &vmcmd_action;
1919         return 1;
1920 }
1921 __setup("vmpanic=", vmcmd_on_panic_setup);
1922
1923 static int __init vmcmd_on_halt_setup(char *str)
1924 {
1925         if (!MACHINE_IS_VM)
1926                 return 1;
1927         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1928         vmcmd_on_halt[127] = 0;
1929         on_halt_trigger.action = &vmcmd_action;
1930         return 1;
1931 }
1932 __setup("vmhalt=", vmcmd_on_halt_setup);
1933
1934 static int __init vmcmd_on_poff_setup(char *str)
1935 {
1936         if (!MACHINE_IS_VM)
1937                 return 1;
1938         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1939         vmcmd_on_poff[127] = 0;
1940         on_poff_trigger.action = &vmcmd_action;
1941         return 1;
1942 }
1943 __setup("vmpoff=", vmcmd_on_poff_setup);
1944
1945 static int on_panic_notify(struct notifier_block *self,
1946                            unsigned long event, void *data)
1947 {
1948         do_panic();
1949         return NOTIFY_OK;
1950 }
1951
1952 static struct notifier_block on_panic_nb = {
1953         .notifier_call = on_panic_notify,
1954         .priority = INT_MIN,
1955 };
1956
1957 void __init setup_ipl(void)
1958 {
1959         ipl_info.type = get_ipl_type();
1960         switch (ipl_info.type) {
1961         case IPL_TYPE_CCW:
1962                 ipl_info.data.ccw.dev_id.ssid = ipl_ssid;
1963                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1964                 break;
1965         case IPL_TYPE_FCP:
1966         case IPL_TYPE_FCP_DUMP:
1967                 ipl_info.data.fcp.dev_id.ssid = 0;
1968                 ipl_info.data.fcp.dev_id.devno =
1969                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1970                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1971                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1972                 break;
1973         case IPL_TYPE_NSS:
1974                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1975                         sizeof(ipl_info.data.nss.name));
1976                 break;
1977         case IPL_TYPE_UNKNOWN:
1978                 /* We have no info to copy */
1979                 break;
1980         }
1981         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1982 }
1983
1984 void __init ipl_update_parameters(void)
1985 {
1986         int rc;
1987
1988         rc = diag308(DIAG308_STORE, &ipl_block);
1989         if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
1990                 diag308_set_works = 1;
1991 }
1992
1993 void __init ipl_save_parameters(void)
1994 {
1995         struct cio_iplinfo iplinfo;
1996         void *src, *dst;
1997
1998         if (cio_get_iplinfo(&iplinfo))
1999                 return;
2000
2001         ipl_ssid = iplinfo.ssid;
2002         ipl_devno = iplinfo.devno;
2003         ipl_flags |= IPL_DEVNO_VALID;
2004         if (!iplinfo.is_qdio)
2005                 return;
2006         ipl_flags |= IPL_PARMBLOCK_VALID;
2007         src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
2008         dst = (void *)IPL_PARMBLOCK_ORIGIN;
2009         memmove(dst, src, PAGE_SIZE);
2010         S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
2011 }
2012
2013 static LIST_HEAD(rcall);
2014 static DEFINE_MUTEX(rcall_mutex);
2015
2016 void register_reset_call(struct reset_call *reset)
2017 {
2018         mutex_lock(&rcall_mutex);
2019         list_add(&reset->list, &rcall);
2020         mutex_unlock(&rcall_mutex);
2021 }
2022 EXPORT_SYMBOL_GPL(register_reset_call);
2023
2024 void unregister_reset_call(struct reset_call *reset)
2025 {
2026         mutex_lock(&rcall_mutex);
2027         list_del(&reset->list);
2028         mutex_unlock(&rcall_mutex);
2029 }
2030 EXPORT_SYMBOL_GPL(unregister_reset_call);
2031
2032 static void do_reset_calls(void)
2033 {
2034         struct reset_call *reset;
2035
2036         if (diag308_set_works) {
2037                 diag308_reset();
2038                 return;
2039         }
2040         list_for_each_entry(reset, &rcall, list)
2041                 reset->fn();
2042 }
2043
2044 u32 dump_prefix_page;
2045
2046 void s390_reset_system(void (*fn_pre)(void),
2047                        void (*fn_post)(void *), void *data)
2048 {
2049         struct _lowcore *lc;
2050
2051         lc = (struct _lowcore *)(unsigned long) store_prefix();
2052
2053         /* Stack for interrupt/machine check handler */
2054         lc->panic_stack = S390_lowcore.panic_stack;
2055
2056         /* Save prefix page address for dump case */
2057         dump_prefix_page = (u32)(unsigned long) lc;
2058
2059         /* Disable prefixing */
2060         set_prefix(0);
2061
2062         /* Disable lowcore protection */
2063         __ctl_clear_bit(0,28);
2064
2065         /* Set new machine check handler */
2066         S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2067         S390_lowcore.mcck_new_psw.addr =
2068                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
2069
2070         /* Set new program check handler */
2071         S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2072         S390_lowcore.program_new_psw.addr =
2073                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
2074
2075         /* Store status at absolute zero */
2076         store_status();
2077
2078         /* Call function before reset */
2079         if (fn_pre)
2080                 fn_pre();
2081         do_reset_calls();
2082         /* Call function after reset */
2083         if (fn_post)
2084                 fn_post(data);
2085 }