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