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