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   1 /*
   2  *  arch/s390/kernel/ipl.c
   3  *    ipl/reipl/dump support for Linux on s390.
   4  *
   5  *    Copyright IBM Corp. 2005,2007
   6  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   7  *               Heiko Carstens <heiko.carstens@de.ibm.com>
   8  *               Volker Sameske <sameske@de.ibm.com>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/delay.h>
  15 #include <linux/reboot.h>
  16 #include <linux/ctype.h>
  17 #include <asm/ipl.h>
  18 #include <asm/smp.h>
  19 #include <asm/setup.h>
  20 #include <asm/cpcmd.h>
  21 #include <asm/cio.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/reset.h>
  24 #include <asm/sclp.h>
  25
  26 #define IPL_PARM_BLOCK_VERSION 0
  27
  28 #define IPL_UNKNOWN_STR         "unknown"
  29 #define IPL_CCW_STR             "ccw"
  30 #define IPL_FCP_STR             "fcp"
  31 #define IPL_FCP_DUMP_STR        "fcp_dump"
  32 #define IPL_NSS_STR             "nss"
  33
  34 #define DUMP_CCW_STR            "ccw"
  35 #define DUMP_FCP_STR            "fcp"
  36 #define DUMP_NONE_STR           "none"
  37
  38 /*
  39  * Four shutdown trigger types are supported:
  40  * - panic
  41  * - halt
  42  * - power off
  43  * - reipl
  44  */
  45 #define ON_PANIC_STR            "on_panic"
  46 #define ON_HALT_STR             "on_halt"
  47 #define ON_POFF_STR             "on_poff"
  48 #define ON_REIPL_STR            "on_reboot"
  49
  50 struct shutdown_action;
  51 struct shutdown_trigger {
  52         char *name;
  53         struct shutdown_action *action;
  54 };
  55
  56 /*
  57  * Five shutdown action types are supported:
  58  */
  59 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
  60 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
  61 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
  62 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
  63 #define SHUTDOWN_ACTION_STOP_STR        "stop"
  64
  65 struct shutdown_action {
  66         char *name;
  67         void (*fn) (struct shutdown_trigger *trigger);
  68         int (*init) (void);
  69 };
  70
  71 static char *ipl_type_str(enum ipl_type type)
  72 {
  73         switch (type) {
  74         case IPL_TYPE_CCW:
  75                 return IPL_CCW_STR;
  76         case IPL_TYPE_FCP:
  77                 return IPL_FCP_STR;
  78         case IPL_TYPE_FCP_DUMP:
  79                 return IPL_FCP_DUMP_STR;
  80         case IPL_TYPE_NSS:
  81                 return IPL_NSS_STR;
  82         case IPL_TYPE_UNKNOWN:
  83         default:
  84                 return IPL_UNKNOWN_STR;
  85         }
  86 }
  87
  88 enum dump_type {
  89         DUMP_TYPE_NONE  = 1,
  90         DUMP_TYPE_CCW   = 2,
  91         DUMP_TYPE_FCP   = 4,
  92 };
  93
  94 static char *dump_type_str(enum dump_type type)
  95 {
  96         switch (type) {
  97         case DUMP_TYPE_NONE:
  98                 return DUMP_NONE_STR;
  99         case DUMP_TYPE_CCW:
 100                 return DUMP_CCW_STR;
 101         case DUMP_TYPE_FCP:
 102                 return DUMP_FCP_STR;
 103         default:
 104                 return NULL;
 105         }
 106 }
 107
 108 /*
 109  * Must be in data section since the bss section
 110  * is not cleared when these are accessed.
 111  */
 112 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
 113 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
 114
 115 enum ipl_method {
 116         REIPL_METHOD_CCW_CIO,
 117         REIPL_METHOD_CCW_DIAG,
 118         REIPL_METHOD_CCW_VM,
 119         REIPL_METHOD_FCP_RO_DIAG,
 120         REIPL_METHOD_FCP_RW_DIAG,
 121         REIPL_METHOD_FCP_RO_VM,
 122         REIPL_METHOD_FCP_DUMP,
 123         REIPL_METHOD_NSS,
 124         REIPL_METHOD_DEFAULT,
 125 };
 126
 127 enum dump_method {
 128         DUMP_METHOD_NONE,
 129         DUMP_METHOD_CCW_CIO,
 130         DUMP_METHOD_CCW_DIAG,
 131         DUMP_METHOD_CCW_VM,
 132         DUMP_METHOD_FCP_DIAG,
 133 };
 134
 135 static int diag308_set_works = 0;
 136
 137 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 138
 139 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 140 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
 141 static struct ipl_parameter_block *reipl_block_fcp;
 142 static struct ipl_parameter_block *reipl_block_ccw;
 143
 144 static char reipl_nss_name[NSS_NAME_SIZE + 1];
 145
 146 static int dump_capabilities = DUMP_TYPE_NONE;
 147 static enum dump_type dump_type = DUMP_TYPE_NONE;
 148 static enum dump_method dump_method = DUMP_METHOD_NONE;
 149 static struct ipl_parameter_block *dump_block_fcp;
 150 static struct ipl_parameter_block *dump_block_ccw;
 151
 152 static struct sclp_ipl_info sclp_ipl_info;
 153
 154 int diag308(unsigned long subcode, void *addr)
 155 {
 156         register unsigned long _addr asm("0") = (unsigned long) addr;
 157         register unsigned long _rc asm("1") = 0;
 158
 159         asm volatile(
 160                 "       diag    %0,%2,0x308\n"
 161                 "0:\n"
 162                 EX_TABLE(0b,0b)
 163                 : "+d" (_addr), "+d" (_rc)
 164                 : "d" (subcode) : "cc", "memory");
 165         return _rc;
 166 }
 167 EXPORT_SYMBOL_GPL(diag308);
 168
 169 /* SYSFS */
 170
 171 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 172 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 173                 struct kobj_attribute *attr,                            \
 174                 char *page)                                             \
 175 {                                                                       \
 176         return sprintf(page, _format, _value);                          \
 177 }                                                                       \
 178 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 179         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
 180
 181 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 182 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 183                 struct kobj_attribute *attr,                            \
 184                 char *page)                                             \
 185 {                                                                       \
 186         return sprintf(page, _fmt_out,                                  \
 187                         (unsigned long long) _value);                   \
 188 }                                                                       \
 189 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 190                 struct kobj_attribute *attr,                            \
 191                 const char *buf, size_t len)                            \
 192 {                                                                       \
 193         unsigned long long value;                                       \
 194         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 195                 return -EINVAL;                                         \
 196         _value = value;                                                 \
 197         return len;                                                     \
 198 }                                                                       \
 199 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 200         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 201                         sys_##_prefix##_##_name##_show,                 \
 202                         sys_##_prefix##_##_name##_store);
 203
 204 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
 205 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 206                 struct kobj_attribute *attr,                            \
 207                 char *page)                                             \
 208 {                                                                       \
 209         return sprintf(page, _fmt_out, _value);                         \
 210 }                                                                       \
 211 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 212                 struct kobj_attribute *attr,                            \
 213                 const char *buf, size_t len)                            \
 214 {                                                                       \
 215         strncpy(_value, buf, sizeof(_value) - 1);                       \
 216         strstrip(_value);                                               \
 217         return len;                                                     \
 218 }                                                                       \
 219 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 220         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 221                         sys_##_prefix##_##_name##_show,                 \
 222                         sys_##_prefix##_##_name##_store);
 223
 224 static void make_attrs_ro(struct attribute **attrs)
 225 {
 226         while (*attrs) {
 227                 (*attrs)->mode = S_IRUGO;
 228                 attrs++;
 229         }
 230 }
 231
 232 /*
 233  * ipl section
 234  */
 235
 236 static __init enum ipl_type get_ipl_type(void)
 237 {
 238         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 239
 240         if (ipl_flags & IPL_NSS_VALID)
 241                 return IPL_TYPE_NSS;
 242         if (!(ipl_flags & IPL_DEVNO_VALID))
 243                 return IPL_TYPE_UNKNOWN;
 244         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 245                 return IPL_TYPE_CCW;
 246         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 247                 return IPL_TYPE_UNKNOWN;
 248         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 249                 return IPL_TYPE_UNKNOWN;
 250         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
 251                 return IPL_TYPE_FCP_DUMP;
 252         return IPL_TYPE_FCP;
 253 }
 254
 255 struct ipl_info ipl_info;
 256 EXPORT_SYMBOL_GPL(ipl_info);
 257
 258 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
 259                              char *page)
 260 {
 261         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
 262 }
 263
 264 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 265
 266 static ssize_t sys_ipl_device_show(struct kobject *kobj,
 267                                    struct kobj_attribute *attr, char *page)
 268 {
 269         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 270
 271         switch (ipl_info.type) {
 272         case IPL_TYPE_CCW:
 273                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 274         case IPL_TYPE_FCP:
 275         case IPL_TYPE_FCP_DUMP:
 276                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 277         default:
 278                 return 0;
 279         }
 280 }
 281
 282 static struct kobj_attribute sys_ipl_device_attr =
 283         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 284
 285 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
 286                                   char *buf, loff_t off, size_t count)
 287 {
 288         unsigned int size = IPL_PARMBLOCK_SIZE;
 289
 290         if (off > size)
 291                 return 0;
 292         if (off + count > size)
 293                 count = size - off;
 294         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
 295         return count;
 296 }
 297
 298 static struct bin_attribute ipl_parameter_attr = {
 299         .attr = {
 300                 .name = "binary_parameter",
 301                 .mode = S_IRUGO,
 302         },
 303         .size = PAGE_SIZE,
 304         .read = &ipl_parameter_read,
 305 };
 306
 307 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
 308                                  char *buf, loff_t off, size_t count)
 309 {
 310         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 311         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 312
 313         if (off > size)
 314                 return 0;
 315         if (off + count > size)
 316                 count = size - off;
 317         memcpy(buf, scp_data + off, count);
 318         return count;
 319 }
 320
 321 static struct bin_attribute ipl_scp_data_attr = {
 322         .attr = {
 323                 .name = "scp_data",
 324                 .mode = S_IRUGO,
 325         },
 326         .size = PAGE_SIZE,
 327         .read = ipl_scp_data_read,
 328 };
 329
 330 /* FCP ipl device attributes */
 331
 332 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 333                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 334 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 335                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 336 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 337                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 338 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 339                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 340
 341 static struct attribute *ipl_fcp_attrs[] = {
 342         &sys_ipl_type_attr.attr,
 343         &sys_ipl_device_attr.attr,
 344         &sys_ipl_fcp_wwpn_attr.attr,
 345         &sys_ipl_fcp_lun_attr.attr,
 346         &sys_ipl_fcp_bootprog_attr.attr,
 347         &sys_ipl_fcp_br_lba_attr.attr,
 348         NULL,
 349 };
 350
 351 static struct attribute_group ipl_fcp_attr_group = {
 352         .attrs = ipl_fcp_attrs,
 353 };
 354
 355 /* CCW ipl device attributes */
 356
 357 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
 358                                      struct kobj_attribute *attr, char *page)
 359 {
 360         char loadparm[LOADPARM_LEN + 1] = {};
 361
 362         if (!sclp_ipl_info.is_valid)
 363                 return sprintf(page, "#unknown#\n");
 364         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
 365         EBCASC(loadparm, LOADPARM_LEN);
 366         strstrip(loadparm);
 367         return sprintf(page, "%s\n", loadparm);
 368 }
 369
 370 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
 371         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 372
 373 static struct attribute *ipl_ccw_attrs[] = {
 374         &sys_ipl_type_attr.attr,
 375         &sys_ipl_device_attr.attr,
 376         &sys_ipl_ccw_loadparm_attr.attr,
 377         NULL,
 378 };
 379
 380 static struct attribute_group ipl_ccw_attr_group = {
 381         .attrs = ipl_ccw_attrs,
 382 };
 383
 384 /* NSS ipl device attributes */
 385
 386 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
 387
 388 static struct attribute *ipl_nss_attrs[] = {
 389         &sys_ipl_type_attr.attr,
 390         &sys_ipl_nss_name_attr.attr,
 391         NULL,
 392 };
 393
 394 static struct attribute_group ipl_nss_attr_group = {
 395         .attrs = ipl_nss_attrs,
 396 };
 397
 398 /* UNKNOWN ipl device attributes */
 399
 400 static struct attribute *ipl_unknown_attrs[] = {
 401         &sys_ipl_type_attr.attr,
 402         NULL,
 403 };
 404
 405 static struct attribute_group ipl_unknown_attr_group = {
 406         .attrs = ipl_unknown_attrs,
 407 };
 408
 409 static struct kset *ipl_kset;
 410
 411 static int __init ipl_register_fcp_files(void)
 412 {
 413         int rc;
 414
 415         rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 416         if (rc)
 417                 goto out;
 418         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
 419         if (rc)
 420                 goto out_ipl_parm;
 421         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
 422         if (!rc)
 423                 goto out;
 424
 425         sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
 426
 427 out_ipl_parm:
 428         sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 429 out:
 430         return rc;
 431 }
 432
 433 static void ipl_run(struct shutdown_trigger *trigger)
 434 {
 435         diag308(DIAG308_IPL, NULL);
 436         if (MACHINE_IS_VM)
 437                 __cpcmd("IPL", NULL, 0, NULL);
 438         else if (ipl_info.type == IPL_TYPE_CCW)
 439                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
 440 }
 441
 442 static int __init ipl_init(void)
 443 {
 444         int rc;
 445
 446         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
 447         if (!ipl_kset) {
 448                 rc = -ENOMEM;
 449                 goto out;
 450         }
 451         switch (ipl_info.type) {
 452         case IPL_TYPE_CCW:
 453                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_ccw_attr_group);
 454                 break;
 455         case IPL_TYPE_FCP:
 456         case IPL_TYPE_FCP_DUMP:
 457                 rc = ipl_register_fcp_files();
 458                 break;
 459         case IPL_TYPE_NSS:
 460                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
 461                 break;
 462         default:
 463                 rc = sysfs_create_group(&ipl_kset->kobj,
 464                                         &ipl_unknown_attr_group);
 465                 break;
 466         }
 467 out:
 468         if (rc)
 469                 panic("ipl_init failed: rc = %i\n", rc);
 470
 471         return 0;
 472 }
 473
 474 static struct shutdown_action __refdata ipl_action = {
 475         .name   = SHUTDOWN_ACTION_IPL_STR,
 476         .fn     = ipl_run,
 477         .init   = ipl_init,
 478 };
 479
 480 /*
 481  * reipl shutdown action: Reboot Linux on shutdown.
 482  */
 483
 484 /* FCP reipl device attributes */
 485
 486 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 487                    reipl_block_fcp->ipl_info.fcp.wwpn);
 488 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
 489                    reipl_block_fcp->ipl_info.fcp.lun);
 490 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 491                    reipl_block_fcp->ipl_info.fcp.bootprog);
 492 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 493                    reipl_block_fcp->ipl_info.fcp.br_lba);
 494 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 495                    reipl_block_fcp->ipl_info.fcp.devno);
 496
 497 static struct attribute *reipl_fcp_attrs[] = {
 498         &sys_reipl_fcp_device_attr.attr,
 499         &sys_reipl_fcp_wwpn_attr.attr,
 500         &sys_reipl_fcp_lun_attr.attr,
 501         &sys_reipl_fcp_bootprog_attr.attr,
 502         &sys_reipl_fcp_br_lba_attr.attr,
 503         NULL,
 504 };
 505
 506 static struct attribute_group reipl_fcp_attr_group = {
 507         .name  = IPL_FCP_STR,
 508         .attrs = reipl_fcp_attrs,
 509 };
 510
 511 /* CCW reipl device attributes */
 512
 513 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 514         reipl_block_ccw->ipl_info.ccw.devno);
 515
 516 static void reipl_get_ascii_loadparm(char *loadparm)
 517 {
 518         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
 519                LOADPARM_LEN);
 520         EBCASC(loadparm, LOADPARM_LEN);
 521         loadparm[LOADPARM_LEN] = 0;
 522         strstrip(loadparm);
 523 }
 524
 525 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
 526                                        struct kobj_attribute *attr, char *page)
 527 {
 528         char buf[LOADPARM_LEN + 1];
 529
 530         reipl_get_ascii_loadparm(buf);
 531         return sprintf(page, "%s\n", buf);
 532 }
 533
 534 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
 535                                         struct kobj_attribute *attr,
 536                                         const char *buf, size_t len)
 537 {
 538         int i, lp_len;
 539
 540         /* ignore trailing newline */
 541         lp_len = len;
 542         if ((len > 0) && (buf[len - 1] == '\n'))
 543                 lp_len--;
 544         /* loadparm can have max 8 characters and must not start with a blank */
 545         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 546                 return -EINVAL;
 547         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 548         for (i = 0; i < lp_len; i++) {
 549                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 550                     (buf[i] == '.'))
 551                         continue;
 552                 return -EINVAL;
 553         }
 554         /* initialize loadparm with blanks */
 555         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
 556         /* copy and convert to ebcdic */
 557         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
 558         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
 559         return len;
 560 }
 561
 562 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
 563         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
 564                reipl_ccw_loadparm_store);
 565
 566 static struct attribute *reipl_ccw_attrs[] = {
 567         &sys_reipl_ccw_device_attr.attr,
 568         &sys_reipl_ccw_loadparm_attr.attr,
 569         NULL,
 570 };
 571
 572 static struct attribute_group reipl_ccw_attr_group = {
 573         .name  = IPL_CCW_STR,
 574         .attrs = reipl_ccw_attrs,
 575 };
 576
 577
 578 /* NSS reipl device attributes */
 579
 580 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
 581
 582 static struct attribute *reipl_nss_attrs[] = {
 583         &sys_reipl_nss_name_attr.attr,
 584         NULL,
 585 };
 586
 587 static struct attribute_group reipl_nss_attr_group = {
 588         .name  = IPL_NSS_STR,
 589         .attrs = reipl_nss_attrs,
 590 };
 591
 592 /* reipl type */
 593
 594 static int reipl_set_type(enum ipl_type type)
 595 {
 596         if (!(reipl_capabilities & type))
 597                 return -EINVAL;
 598
 599         switch(type) {
 600         case IPL_TYPE_CCW:
 601                 if (diag308_set_works)
 602                         reipl_method = REIPL_METHOD_CCW_DIAG;
 603                 else if (MACHINE_IS_VM)
 604                         reipl_method = REIPL_METHOD_CCW_VM;
 605                 else
 606                         reipl_method = REIPL_METHOD_CCW_CIO;
 607                 break;
 608         case IPL_TYPE_FCP:
 609                 if (diag308_set_works)
 610                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
 611                 else if (MACHINE_IS_VM)
 612                         reipl_method = REIPL_METHOD_FCP_RO_VM;
 613                 else
 614                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
 615                 break;
 616         case IPL_TYPE_FCP_DUMP:
 617                 reipl_method = REIPL_METHOD_FCP_DUMP;
 618                 break;
 619         case IPL_TYPE_NSS:
 620                 reipl_method = REIPL_METHOD_NSS;
 621                 break;
 622         case IPL_TYPE_UNKNOWN:
 623                 reipl_method = REIPL_METHOD_DEFAULT;
 624                 break;
 625         default:
 626                 BUG();
 627         }
 628         reipl_type = type;
 629         return 0;
 630 }
 631
 632 static ssize_t reipl_type_show(struct kobject *kobj,
 633                                struct kobj_attribute *attr, char *page)
 634 {
 635         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
 636 }
 637
 638 static ssize_t reipl_type_store(struct kobject *kobj,
 639                                 struct kobj_attribute *attr,
 640                                 const char *buf, size_t len)
 641 {
 642         int rc = -EINVAL;
 643
 644         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 645                 rc = reipl_set_type(IPL_TYPE_CCW);
 646         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 647                 rc = reipl_set_type(IPL_TYPE_FCP);
 648         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
 649                 rc = reipl_set_type(IPL_TYPE_NSS);
 650         return (rc != 0) ? rc : len;
 651 }
 652
 653 static struct kobj_attribute reipl_type_attr =
 654         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
 655
 656 static struct kset *reipl_kset;
 657
 658 void reipl_run(struct shutdown_trigger *trigger)
 659 {
 660         struct ccw_dev_id devid;
 661         static char buf[100];
 662         char loadparm[LOADPARM_LEN + 1];
 663
 664         switch (reipl_method) {
 665         case REIPL_METHOD_CCW_CIO:
 666                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
 667                 devid.ssid  = 0;
 668                 reipl_ccw_dev(&devid);
 669                 break;
 670         case REIPL_METHOD_CCW_VM:
 671                 reipl_get_ascii_loadparm(loadparm);
 672                 if (strlen(loadparm) == 0)
 673                         sprintf(buf, "IPL %X CLEAR",
 674                                 reipl_block_ccw->ipl_info.ccw.devno);
 675                 else
 676                         sprintf(buf, "IPL %X CLEAR LOADPARM '%s'",
 677                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
 678                 __cpcmd(buf, NULL, 0, NULL);
 679                 break;
 680         case REIPL_METHOD_CCW_DIAG:
 681                 diag308(DIAG308_SET, reipl_block_ccw);
 682                 diag308(DIAG308_IPL, NULL);
 683                 break;
 684         case REIPL_METHOD_FCP_RW_DIAG:
 685                 diag308(DIAG308_SET, reipl_block_fcp);
 686                 diag308(DIAG308_IPL, NULL);
 687                 break;
 688         case REIPL_METHOD_FCP_RO_DIAG:
 689                 diag308(DIAG308_IPL, NULL);
 690                 break;
 691         case REIPL_METHOD_FCP_RO_VM:
 692                 __cpcmd("IPL", NULL, 0, NULL);
 693                 break;
 694         case REIPL_METHOD_NSS:
 695                 sprintf(buf, "IPL %s", reipl_nss_name);
 696                 __cpcmd(buf, NULL, 0, NULL);
 697                 break;
 698         case REIPL_METHOD_DEFAULT:
 699                 if (MACHINE_IS_VM)
 700                         __cpcmd("IPL", NULL, 0, NULL);
 701                 diag308(DIAG308_IPL, NULL);
 702                 break;
 703         case REIPL_METHOD_FCP_DUMP:
 704         default:
 705                 break;
 706         }
 707 }
 708
 709 static void __init reipl_probe(void)
 710 {
 711         void *buffer;
 712
 713         buffer = (void *) get_zeroed_page(GFP_KERNEL);
 714         if (!buffer)
 715                 return;
 716         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
 717                 diag308_set_works = 1;
 718         free_page((unsigned long)buffer);
 719 }
 720
 721 static int __init reipl_nss_init(void)
 722 {
 723         int rc;
 724
 725         if (!MACHINE_IS_VM)
 726                 return 0;
 727         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
 728         if (rc)
 729                 return rc;
 730         strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
 731         reipl_capabilities |= IPL_TYPE_NSS;
 732         return 0;
 733 }
 734
 735 static int __init reipl_ccw_init(void)
 736 {
 737         int rc;
 738
 739         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 740         if (!reipl_block_ccw)
 741                 return -ENOMEM;
 742         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_ccw_attr_group);
 743         if (rc) {
 744                 free_page((unsigned long)reipl_block_ccw);
 745                 return rc;
 746         }
 747         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 748         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 749         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 750         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 751         reipl_block_ccw->hdr.flags = DIAG308_FLAGS_LP_VALID;
 752         /* check if read scp info worked and set loadparm */
 753         if (sclp_ipl_info.is_valid)
 754                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
 755                        &sclp_ipl_info.loadparm, LOADPARM_LEN);
 756         else
 757                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
 758                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
 759                        LOADPARM_LEN);
 760         if (!MACHINE_IS_VM && !diag308_set_works)
 761                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
 762         if (ipl_info.type == IPL_TYPE_CCW)
 763                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
 764         reipl_capabilities |= IPL_TYPE_CCW;
 765         return 0;
 766 }
 767
 768 static int __init reipl_fcp_init(void)
 769 {
 770         int rc;
 771
 772         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
 773                 return 0;
 774         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
 775                 make_attrs_ro(reipl_fcp_attrs);
 776
 777         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 778         if (!reipl_block_fcp)
 779                 return -ENOMEM;
 780         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
 781         if (rc) {
 782                 free_page((unsigned long)reipl_block_fcp);
 783                 return rc;
 784         }
 785         if (ipl_info.type == IPL_TYPE_FCP) {
 786                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
 787         } else {
 788                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 789                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
 790                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
 791                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
 792                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
 793         }
 794         reipl_capabilities |= IPL_TYPE_FCP;
 795         return 0;
 796 }
 797
 798 static int __init reipl_init(void)
 799 {
 800         int rc;
 801
 802         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
 803         if (!reipl_kset)
 804                 return -ENOMEM;
 805         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
 806         if (rc) {
 807                 kset_unregister(reipl_kset);
 808                 return rc;
 809         }
 810         rc = reipl_ccw_init();
 811         if (rc)
 812                 return rc;
 813         rc = reipl_fcp_init();
 814         if (rc)
 815                 return rc;
 816         rc = reipl_nss_init();
 817         if (rc)
 818                 return rc;
 819         rc = reipl_set_type(ipl_info.type);
 820         if (rc)
 821                 return rc;
 822         return 0;
 823 }
 824
 825 static struct shutdown_action __refdata reipl_action = {
 826         .name   = SHUTDOWN_ACTION_REIPL_STR,
 827         .fn     = reipl_run,
 828         .init   = reipl_init,
 829 };
 830
 831 /*
 832  * dump shutdown action: Dump Linux on shutdown.
 833  */
 834
 835 /* FCP dump device attributes */
 836
 837 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 838                    dump_block_fcp->ipl_info.fcp.wwpn);
 839 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
 840                    dump_block_fcp->ipl_info.fcp.lun);
 841 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
 842                    dump_block_fcp->ipl_info.fcp.bootprog);
 843 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
 844                    dump_block_fcp->ipl_info.fcp.br_lba);
 845 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 846                    dump_block_fcp->ipl_info.fcp.devno);
 847
 848 static struct attribute *dump_fcp_attrs[] = {
 849         &sys_dump_fcp_device_attr.attr,
 850         &sys_dump_fcp_wwpn_attr.attr,
 851         &sys_dump_fcp_lun_attr.attr,
 852         &sys_dump_fcp_bootprog_attr.attr,
 853         &sys_dump_fcp_br_lba_attr.attr,
 854         NULL,
 855 };
 856
 857 static struct attribute_group dump_fcp_attr_group = {
 858         .name  = IPL_FCP_STR,
 859         .attrs = dump_fcp_attrs,
 860 };
 861
 862 /* CCW dump device attributes */
 863
 864 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 865                    dump_block_ccw->ipl_info.ccw.devno);
 866
 867 static struct attribute *dump_ccw_attrs[] = {
 868         &sys_dump_ccw_device_attr.attr,
 869         NULL,
 870 };
 871
 872 static struct attribute_group dump_ccw_attr_group = {
 873         .name  = IPL_CCW_STR,
 874         .attrs = dump_ccw_attrs,
 875 };
 876
 877 /* dump type */
 878
 879 static int dump_set_type(enum dump_type type)
 880 {
 881         if (!(dump_capabilities & type))
 882                 return -EINVAL;
 883         switch (type) {
 884         case DUMP_TYPE_CCW:
 885                 if (diag308_set_works)
 886                         dump_method = DUMP_METHOD_CCW_DIAG;
 887                 else if (MACHINE_IS_VM)
 888                         dump_method = DUMP_METHOD_CCW_VM;
 889                 else
 890                         dump_method = DUMP_METHOD_CCW_CIO;
 891                 break;
 892         case DUMP_TYPE_FCP:
 893                 dump_method = DUMP_METHOD_FCP_DIAG;
 894                 break;
 895         default:
 896                 dump_method = DUMP_METHOD_NONE;
 897         }
 898         dump_type = type;
 899         return 0;
 900 }
 901
 902 static ssize_t dump_type_show(struct kobject *kobj,
 903                               struct kobj_attribute *attr, char *page)
 904 {
 905         return sprintf(page, "%s\n", dump_type_str(dump_type));
 906 }
 907
 908 static ssize_t dump_type_store(struct kobject *kobj,
 909                                struct kobj_attribute *attr,
 910                                const char *buf, size_t len)
 911 {
 912         int rc = -EINVAL;
 913
 914         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
 915                 rc = dump_set_type(DUMP_TYPE_NONE);
 916         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
 917                 rc = dump_set_type(DUMP_TYPE_CCW);
 918         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
 919                 rc = dump_set_type(DUMP_TYPE_FCP);
 920         return (rc != 0) ? rc : len;
 921 }
 922
 923 static struct kobj_attribute dump_type_attr =
 924         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
 925
 926 static struct kset *dump_kset;
 927
 928 static void dump_run(struct shutdown_trigger *trigger)
 929 {
 930         struct ccw_dev_id devid;
 931         static char buf[100];
 932
 933         switch (dump_method) {
 934         case DUMP_METHOD_CCW_CIO:
 935                 smp_send_stop();
 936                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
 937                 devid.ssid  = 0;
 938                 reipl_ccw_dev(&devid);
 939                 break;
 940         case DUMP_METHOD_CCW_VM:
 941                 smp_send_stop();
 942                 sprintf(buf, "STORE STATUS");
 943                 __cpcmd(buf, NULL, 0, NULL);
 944                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
 945                 __cpcmd(buf, NULL, 0, NULL);
 946                 break;
 947         case DUMP_METHOD_CCW_DIAG:
 948                 diag308(DIAG308_SET, dump_block_ccw);
 949                 diag308(DIAG308_DUMP, NULL);
 950                 break;
 951         case DUMP_METHOD_FCP_DIAG:
 952                 diag308(DIAG308_SET, dump_block_fcp);
 953                 diag308(DIAG308_DUMP, NULL);
 954                 break;
 955         case DUMP_METHOD_NONE:
 956         default:
 957                 return;
 958         }
 959         printk(KERN_EMERG "Dump failed!\n");
 960 }
 961
 962 static int __init dump_ccw_init(void)
 963 {
 964         int rc;
 965
 966         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 967         if (!dump_block_ccw)
 968                 return -ENOMEM;
 969         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
 970         if (rc) {
 971                 free_page((unsigned long)dump_block_ccw);
 972                 return rc;
 973         }
 974         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 975         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 976         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 977         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 978         dump_capabilities |= DUMP_TYPE_CCW;
 979         return 0;
 980 }
 981
 982 static int __init dump_fcp_init(void)
 983 {
 984         int rc;
 985
 986         if (!sclp_ipl_info.has_dump)
 987                 return 0; /* LDIPL DUMP is not installed */
 988         if (!diag308_set_works)
 989                 return 0;
 990         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 991         if (!dump_block_fcp)
 992                 return -ENOMEM;
 993         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
 994         if (rc) {
 995                 free_page((unsigned long)dump_block_fcp);
 996                 return rc;
 997         }
 998         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 999         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1000         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1001         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1002         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1003         dump_capabilities |= DUMP_TYPE_FCP;
1004         return 0;
1005 }
1006
1007 static int __init dump_init(void)
1008 {
1009         int rc;
1010
1011         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1012         if (!dump_kset)
1013                 return -ENOMEM;
1014         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1015         if (rc) {
1016                 kset_unregister(dump_kset);
1017                 return rc;
1018         }
1019         rc = dump_ccw_init();
1020         if (rc)
1021                 return rc;
1022         rc = dump_fcp_init();
1023         if (rc)
1024                 return rc;
1025         dump_set_type(DUMP_TYPE_NONE);
1026         return 0;
1027 }
1028
1029 static struct shutdown_action __refdata dump_action = {
1030         .name   = SHUTDOWN_ACTION_DUMP_STR,
1031         .fn     = dump_run,
1032         .init   = dump_init,
1033 };
1034
1035 /*
1036  * vmcmd shutdown action: Trigger vm command on shutdown.
1037  */
1038
1039 static char vmcmd_on_reboot[128];
1040 static char vmcmd_on_panic[128];
1041 static char vmcmd_on_halt[128];
1042 static char vmcmd_on_poff[128];
1043
1044 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1045 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1046 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1047 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1048
1049 static struct attribute *vmcmd_attrs[] = {
1050         &sys_vmcmd_on_reboot_attr.attr,
1051         &sys_vmcmd_on_panic_attr.attr,
1052         &sys_vmcmd_on_halt_attr.attr,
1053         &sys_vmcmd_on_poff_attr.attr,
1054         NULL,
1055 };
1056
1057 static struct attribute_group vmcmd_attr_group = {
1058         .attrs = vmcmd_attrs,
1059 };
1060
1061 static struct kset *vmcmd_kset;
1062
1063 static void vmcmd_run(struct shutdown_trigger *trigger)
1064 {
1065         char *cmd, *next_cmd;
1066
1067         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1068                 cmd = vmcmd_on_reboot;
1069         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1070                 cmd = vmcmd_on_panic;
1071         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1072                 cmd = vmcmd_on_halt;
1073         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1074                 cmd = vmcmd_on_poff;
1075         else
1076                 return;
1077
1078         if (strlen(cmd) == 0)
1079                 return;
1080         do {
1081                 next_cmd = strchr(cmd, '\n');
1082                 if (next_cmd) {
1083                         next_cmd[0] = 0;
1084                         next_cmd += 1;
1085                 }
1086                 __cpcmd(cmd, NULL, 0, NULL);
1087                 cmd = next_cmd;
1088         } while (cmd != NULL);
1089 }
1090
1091 static int vmcmd_init(void)
1092 {
1093         if (!MACHINE_IS_VM)
1094                 return -ENOTSUPP;
1095         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1096         if (!vmcmd_kset)
1097                 return -ENOMEM;
1098         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1099 }
1100
1101 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1102                                               vmcmd_run, vmcmd_init};
1103
1104 /*
1105  * stop shutdown action: Stop Linux on shutdown.
1106  */
1107
1108 static void stop_run(struct shutdown_trigger *trigger)
1109 {
1110         if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1111                 disabled_wait((unsigned long) __builtin_return_address(0));
1112         else {
1113                 signal_processor(smp_processor_id(), sigp_stop);
1114                 for (;;);
1115         }
1116 }
1117
1118 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1119                                              stop_run, NULL};
1120
1121 /* action list */
1122
1123 static struct shutdown_action *shutdown_actions_list[] = {
1124         &ipl_action, &reipl_action, &dump_action, &vmcmd_action, &stop_action};
1125 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1126
1127 /*
1128  * Trigger section
1129  */
1130
1131 static struct kset *shutdown_actions_kset;
1132
1133 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1134                        size_t len)
1135 {
1136         int i;
1137         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1138                 if (!shutdown_actions_list[i])
1139                         continue;
1140                 if (strncmp(buf, shutdown_actions_list[i]->name,
1141                             strlen(shutdown_actions_list[i]->name)) == 0) {
1142                         trigger->action = shutdown_actions_list[i];
1143                         return len;
1144                 }
1145         }
1146         return -EINVAL;
1147 }
1148
1149 /* on reipl */
1150
1151 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1152                                                     &reipl_action};
1153
1154 static ssize_t on_reboot_show(struct kobject *kobj,
1155                               struct kobj_attribute *attr, char *page)
1156 {
1157         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1158 }
1159
1160 static ssize_t on_reboot_store(struct kobject *kobj,
1161                                struct kobj_attribute *attr,
1162                                const char *buf, size_t len)
1163 {
1164         return set_trigger(buf, &on_reboot_trigger, len);
1165 }
1166
1167 static struct kobj_attribute on_reboot_attr =
1168         __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1169
1170 static void do_machine_restart(char *__unused)
1171 {
1172         smp_send_stop();
1173         on_reboot_trigger.action->fn(&on_reboot_trigger);
1174         reipl_run(NULL);
1175 }
1176 void (*_machine_restart)(char *command) = do_machine_restart;
1177
1178 /* on panic */
1179
1180 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1181
1182 static ssize_t on_panic_show(struct kobject *kobj,
1183                              struct kobj_attribute *attr, char *page)
1184 {
1185         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1186 }
1187
1188 static ssize_t on_panic_store(struct kobject *kobj,
1189                               struct kobj_attribute *attr,
1190                               const char *buf, size_t len)
1191 {
1192         return set_trigger(buf, &on_panic_trigger, len);
1193 }
1194
1195 static struct kobj_attribute on_panic_attr =
1196         __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1197
1198 static void do_panic(void)
1199 {
1200         on_panic_trigger.action->fn(&on_panic_trigger);
1201         stop_run(&on_panic_trigger);
1202 }
1203
1204 /* on halt */
1205
1206 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1207
1208 static ssize_t on_halt_show(struct kobject *kobj,
1209                             struct kobj_attribute *attr, char *page)
1210 {
1211         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1212 }
1213
1214 static ssize_t on_halt_store(struct kobject *kobj,
1215                              struct kobj_attribute *attr,
1216                              const char *buf, size_t len)
1217 {
1218         return set_trigger(buf, &on_halt_trigger, len);
1219 }
1220
1221 static struct kobj_attribute on_halt_attr =
1222         __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1223
1224
1225 static void do_machine_halt(void)
1226 {
1227         smp_send_stop();
1228         on_halt_trigger.action->fn(&on_halt_trigger);
1229         stop_run(&on_halt_trigger);
1230 }
1231 void (*_machine_halt)(void) = do_machine_halt;
1232
1233 /* on power off */
1234
1235 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1236
1237 static ssize_t on_poff_show(struct kobject *kobj,
1238                             struct kobj_attribute *attr, char *page)
1239 {
1240         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1241 }
1242
1243 static ssize_t on_poff_store(struct kobject *kobj,
1244                              struct kobj_attribute *attr,
1245                              const char *buf, size_t len)
1246 {
1247         return set_trigger(buf, &on_poff_trigger, len);
1248 }
1249
1250 static struct kobj_attribute on_poff_attr =
1251         __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1252
1253
1254 static void do_machine_power_off(void)
1255 {
1256         smp_send_stop();
1257         on_poff_trigger.action->fn(&on_poff_trigger);
1258         stop_run(&on_poff_trigger);
1259 }
1260 void (*_machine_power_off)(void) = do_machine_power_off;
1261
1262 static void __init shutdown_triggers_init(void)
1263 {
1264         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1265                                                     firmware_kobj);
1266         if (!shutdown_actions_kset)
1267                 goto fail;
1268         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1269                               &on_reboot_attr.attr))
1270                 goto fail;
1271         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1272                               &on_panic_attr.attr))
1273                 goto fail;
1274         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1275                               &on_halt_attr.attr))
1276                 goto fail;
1277         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1278                               &on_poff_attr.attr))
1279                 goto fail;
1280
1281         return;
1282 fail:
1283         panic("shutdown_triggers_init failed\n");
1284 }
1285
1286 static void __init shutdown_actions_init(void)
1287 {
1288         int i;
1289
1290         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1291                 if (!shutdown_actions_list[i]->init)
1292                         continue;
1293                 if (shutdown_actions_list[i]->init())
1294                         shutdown_actions_list[i] = NULL;
1295         }
1296 }
1297
1298 static int __init s390_ipl_init(void)
1299 {
1300         reipl_probe();
1301         sclp_get_ipl_info(&sclp_ipl_info);
1302         shutdown_actions_init();
1303         shutdown_triggers_init();
1304         return 0;
1305 }
1306
1307 __initcall(s390_ipl_init);
1308
1309 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1310 {
1311         int sx, dx;
1312
1313         dx = 0;
1314         for (sx = 0; src[sx] != 0; sx++) {
1315                 if (src[sx] == '"')
1316                         continue;
1317                 dst[dx++] = src[sx];
1318                 if (dx >= n)
1319                         break;
1320         }
1321 }
1322
1323 static int __init vmcmd_on_reboot_setup(char *str)
1324 {
1325         if (!MACHINE_IS_VM)
1326                 return 1;
1327         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1328         vmcmd_on_reboot[127] = 0;
1329         on_reboot_trigger.action = &vmcmd_action;
1330         return 1;
1331 }
1332 __setup("vmreboot=", vmcmd_on_reboot_setup);
1333
1334 static int __init vmcmd_on_panic_setup(char *str)
1335 {
1336         if (!MACHINE_IS_VM)
1337                 return 1;
1338         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1339         vmcmd_on_panic[127] = 0;
1340         on_panic_trigger.action = &vmcmd_action;
1341         return 1;
1342 }
1343 __setup("vmpanic=", vmcmd_on_panic_setup);
1344
1345 static int __init vmcmd_on_halt_setup(char *str)
1346 {
1347         if (!MACHINE_IS_VM)
1348                 return 1;
1349         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1350         vmcmd_on_halt[127] = 0;
1351         on_halt_trigger.action = &vmcmd_action;
1352         return 1;
1353 }
1354 __setup("vmhalt=", vmcmd_on_halt_setup);
1355
1356 static int __init vmcmd_on_poff_setup(char *str)
1357 {
1358         if (!MACHINE_IS_VM)
1359                 return 1;
1360         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1361         vmcmd_on_poff[127] = 0;
1362         on_poff_trigger.action = &vmcmd_action;
1363         return 1;
1364 }
1365 __setup("vmpoff=", vmcmd_on_poff_setup);
1366
1367 static int on_panic_notify(struct notifier_block *self,
1368                            unsigned long event, void *data)
1369 {
1370         do_panic();
1371         return NOTIFY_OK;
1372 }
1373
1374 static struct notifier_block on_panic_nb = {
1375         .notifier_call = on_panic_notify,
1376         .priority = 0,
1377 };
1378
1379 void __init setup_ipl(void)
1380 {
1381         ipl_info.type = get_ipl_type();
1382         switch (ipl_info.type) {
1383         case IPL_TYPE_CCW:
1384                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1385                 ipl_info.data.ccw.dev_id.ssid = 0;
1386                 break;
1387         case IPL_TYPE_FCP:
1388         case IPL_TYPE_FCP_DUMP:
1389                 ipl_info.data.fcp.dev_id.devno =
1390                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1391                 ipl_info.data.fcp.dev_id.ssid = 0;
1392                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1393                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1394                 break;
1395         case IPL_TYPE_NSS:
1396                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1397                         sizeof(ipl_info.data.nss.name));
1398                 break;
1399         case IPL_TYPE_UNKNOWN:
1400         default:
1401                 /* We have no info to copy */
1402                 break;
1403         }
1404         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1405 }
1406
1407 void __init ipl_save_parameters(void)
1408 {
1409         struct cio_iplinfo iplinfo;
1410         unsigned int *ipl_ptr;
1411         void *src, *dst;
1412
1413         if (cio_get_iplinfo(&iplinfo))
1414                 return;
1415
1416         ipl_devno = iplinfo.devno;
1417         ipl_flags |= IPL_DEVNO_VALID;
1418         if (!iplinfo.is_qdio)
1419                 return;
1420         ipl_flags |= IPL_PARMBLOCK_VALID;
1421         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1422         src = (void *)(unsigned long)*ipl_ptr;
1423         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1424         memmove(dst, src, PAGE_SIZE);
1425         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1426 }
1427
1428 static LIST_HEAD(rcall);
1429 static DEFINE_MUTEX(rcall_mutex);
1430
1431 void register_reset_call(struct reset_call *reset)
1432 {
1433         mutex_lock(&rcall_mutex);
1434         list_add(&reset->list, &rcall);
1435         mutex_unlock(&rcall_mutex);
1436 }
1437 EXPORT_SYMBOL_GPL(register_reset_call);
1438
1439 void unregister_reset_call(struct reset_call *reset)
1440 {
1441         mutex_lock(&rcall_mutex);
1442         list_del(&reset->list);
1443         mutex_unlock(&rcall_mutex);
1444 }
1445 EXPORT_SYMBOL_GPL(unregister_reset_call);
1446
1447 static void do_reset_calls(void)
1448 {
1449         struct reset_call *reset;
1450
1451         list_for_each_entry(reset, &rcall, list)
1452                 reset->fn();
1453 }
1454
1455 u32 dump_prefix_page;
1456
1457 void s390_reset_system(void)
1458 {
1459         struct _lowcore *lc;
1460
1461         lc = (struct _lowcore *)(unsigned long) store_prefix();
1462
1463         /* Stack for interrupt/machine check handler */
1464         lc->panic_stack = S390_lowcore.panic_stack;
1465
1466         /* Save prefix page address for dump case */
1467         dump_prefix_page = (u32)(unsigned long) lc;
1468
1469         /* Disable prefixing */
1470         set_prefix(0);
1471
1472         /* Disable lowcore protection */
1473         __ctl_clear_bit(0,28);
1474
1475         /* Set new machine check handler */
1476         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1477         S390_lowcore.mcck_new_psw.addr =
1478                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1479
1480         /* Set new program check handler */
1481         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1482         S390_lowcore.program_new_psw.addr =
1483                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1484
1485         do_reset_calls();
1486 }
1487