arch/s390/kernel/ipl.c

   1 /*
   2  *  arch/s390/kernel/ipl.c
   3  *    ipl/reipl/dump support for Linux on s390.
   4  *
   5  *    Copyright (C) IBM Corp. 2005,2006
   6  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   7  *               Heiko Carstens <heiko.carstens@de.ibm.com>
   8  *               Volker Sameske <sameske@de.ibm.com>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/delay.h>
  15 #include <linux/reboot.h>
  16 #include <linux/ctype.h>
  17 #include <asm/ipl.h>
  18 #include <asm/smp.h>
  19 #include <asm/setup.h>
  20 #include <asm/cpcmd.h>
  21 #include <asm/cio.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/reset.h>
  24 #include <asm/sclp.h>
  25
  26 #define IPL_PARM_BLOCK_VERSION 0
  27
  28 #define IPL_UNKNOWN_STR         "unknown"
  29 #define IPL_CCW_STR             "ccw"
  30 #define IPL_FCP_STR             "fcp"
  31 #define IPL_FCP_DUMP_STR        "fcp_dump"
  32 #define IPL_NSS_STR             "nss"
  33
  34 static char *ipl_type_str(enum ipl_type type)
  35 {
  36         switch (type) {
  37         case IPL_TYPE_CCW:
  38                 return IPL_CCW_STR;
  39         case IPL_TYPE_FCP:
  40                 return IPL_FCP_STR;
  41         case IPL_TYPE_FCP_DUMP:
  42                 return IPL_FCP_DUMP_STR;
  43         case IPL_TYPE_NSS:
  44                 return IPL_NSS_STR;
  45         case IPL_TYPE_UNKNOWN:
  46         default:
  47                 return IPL_UNKNOWN_STR;
  48         }
  49 }
  50
  51 enum dump_type {
  52         DUMP_TYPE_NONE  = 1,
  53         DUMP_TYPE_CCW   = 2,
  54         DUMP_TYPE_FCP   = 4,
  55 };
  56
  57 #define DUMP_NONE_STR    "none"
  58 #define DUMP_CCW_STR     "ccw"
  59 #define DUMP_FCP_STR     "fcp"
  60
  61 static char *dump_type_str(enum dump_type type)
  62 {
  63         switch (type) {
  64         case DUMP_TYPE_NONE:
  65                 return DUMP_NONE_STR;
  66         case DUMP_TYPE_CCW:
  67                 return DUMP_CCW_STR;
  68         case DUMP_TYPE_FCP:
  69                 return DUMP_FCP_STR;
  70         default:
  71                 return NULL;
  72         }
  73 }
  74
  75 /*
  76  * Must be in data section since the bss section
  77  * is not cleared when these are accessed.
  78  */
  79 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
  80 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
  81
  82 enum ipl_method {
  83         REIPL_METHOD_CCW_CIO,
  84         REIPL_METHOD_CCW_DIAG,
  85         REIPL_METHOD_CCW_VM,
  86         REIPL_METHOD_FCP_RO_DIAG,
  87         REIPL_METHOD_FCP_RW_DIAG,
  88         REIPL_METHOD_FCP_RO_VM,
  89         REIPL_METHOD_FCP_DUMP,
  90         REIPL_METHOD_NSS,
  91         REIPL_METHOD_DEFAULT,
  92 };
  93
  94 enum dump_method {
  95         DUMP_METHOD_NONE,
  96         DUMP_METHOD_CCW_CIO,
  97         DUMP_METHOD_CCW_DIAG,
  98         DUMP_METHOD_CCW_VM,
  99         DUMP_METHOD_FCP_DIAG,
 100 };
 101
 102 enum shutdown_action {
 103         SHUTDOWN_REIPL,
 104         SHUTDOWN_DUMP,
 105         SHUTDOWN_STOP,
 106 };
 107
 108 #define SHUTDOWN_REIPL_STR "reipl"
 109 #define SHUTDOWN_DUMP_STR  "dump"
 110 #define SHUTDOWN_STOP_STR  "stop"
 111
 112 static char *shutdown_action_str(enum shutdown_action action)
 113 {
 114         switch (action) {
 115         case SHUTDOWN_REIPL:
 116                 return SHUTDOWN_REIPL_STR;
 117         case SHUTDOWN_DUMP:
 118                 return SHUTDOWN_DUMP_STR;
 119         case SHUTDOWN_STOP:
 120                 return SHUTDOWN_STOP_STR;
 121         default:
 122                 return NULL;
 123         }
 124 }
 125
 126 static int diag308_set_works = 0;
 127
 128 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 129
 130 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 131 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
 132 static struct ipl_parameter_block *reipl_block_fcp;
 133 static struct ipl_parameter_block *reipl_block_ccw;
 134
 135 static char reipl_nss_name[NSS_NAME_SIZE + 1];
 136
 137 static int dump_capabilities = DUMP_TYPE_NONE;
 138 static enum dump_type dump_type = DUMP_TYPE_NONE;
 139 static enum dump_method dump_method = DUMP_METHOD_NONE;
 140 static struct ipl_parameter_block *dump_block_fcp;
 141 static struct ipl_parameter_block *dump_block_ccw;
 142
 143 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
 144
 145 static struct sclp_ipl_info sclp_ipl_info;
 146
 147 int diag308(unsigned long subcode, void *addr)
 148 {
 149         register unsigned long _addr asm("0") = (unsigned long) addr;
 150         register unsigned long _rc asm("1") = 0;
 151
 152         asm volatile(
 153                 "       diag    %0,%2,0x308\n"
 154                 "0:\n"
 155                 EX_TABLE(0b,0b)
 156                 : "+d" (_addr), "+d" (_rc)
 157                 : "d" (subcode) : "cc", "memory");
 158         return _rc;
 159 }
 160 EXPORT_SYMBOL_GPL(diag308);
 161
 162 /* SYSFS */
 163
 164 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 165 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
 166                 char *page)                                             \
 167 {                                                                       \
 168         return sprintf(page, _format, _value);                          \
 169 }                                                                       \
 170 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
 171         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
 172
 173 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 174 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
 175                 char *page)                                             \
 176 {                                                                       \
 177         return sprintf(page, _fmt_out,                                  \
 178                         (unsigned long long) _value);                   \
 179 }                                                                       \
 180 static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,       \
 181                 const char *buf, size_t len)                            \
 182 {                                                                       \
 183         unsigned long long value;                                       \
 184         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 185                 return -EINVAL;                                         \
 186         _value = value;                                                 \
 187         return len;                                                     \
 188 }                                                                       \
 189 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
 190         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 191                         sys_##_prefix##_##_name##_show,                 \
 192                         sys_##_prefix##_##_name##_store);
 193
 194 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
 195 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
 196                 char *page)                                             \
 197 {                                                                       \
 198         return sprintf(page, _fmt_out, _value);                         \
 199 }                                                                       \
 200 static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,       \
 201                 const char *buf, size_t len)                            \
 202 {                                                                       \
 203         if (sscanf(buf, _fmt_in, _value) != 1)                          \
 204                 return -EINVAL;                                         \
 205         return len;                                                     \
 206 }                                                                       \
 207 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
 208         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 209                         sys_##_prefix##_##_name##_show,                 \
 210                         sys_##_prefix##_##_name##_store);
 211
 212 static void make_attrs_ro(struct attribute **attrs)
 213 {
 214         while (*attrs) {
 215                 (*attrs)->mode = S_IRUGO;
 216                 attrs++;
 217         }
 218 }
 219
 220 /*
 221  * ipl section
 222  */
 223
 224 static __init enum ipl_type get_ipl_type(void)
 225 {
 226         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 227
 228         if (ipl_flags & IPL_NSS_VALID)
 229                 return IPL_TYPE_NSS;
 230         if (!(ipl_flags & IPL_DEVNO_VALID))
 231                 return IPL_TYPE_UNKNOWN;
 232         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 233                 return IPL_TYPE_CCW;
 234         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 235                 return IPL_TYPE_UNKNOWN;
 236         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 237                 return IPL_TYPE_UNKNOWN;
 238         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
 239                 return IPL_TYPE_FCP_DUMP;
 240         return IPL_TYPE_FCP;
 241 }
 242
 243 void __init setup_ipl_info(void)
 244 {
 245         ipl_info.type = get_ipl_type();
 246         switch (ipl_info.type) {
 247         case IPL_TYPE_CCW:
 248                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
 249                 ipl_info.data.ccw.dev_id.ssid = 0;
 250                 break;
 251         case IPL_TYPE_FCP:
 252         case IPL_TYPE_FCP_DUMP:
 253                 ipl_info.data.fcp.dev_id.devno =
 254                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
 255                 ipl_info.data.fcp.dev_id.ssid = 0;
 256                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
 257                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
 258                 break;
 259         case IPL_TYPE_NSS:
 260                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
 261                         sizeof(ipl_info.data.nss.name));
 262                 break;
 263         case IPL_TYPE_UNKNOWN:
 264         default:
 265                 /* We have no info to copy */
 266                 break;
 267         }
 268 }
 269
 270 struct ipl_info ipl_info;
 271 EXPORT_SYMBOL_GPL(ipl_info);
 272
 273 static ssize_t ipl_type_show(struct kset *kset, char *page)
 274 {
 275         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
 276 }
 277
 278 static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 279
 280 static ssize_t sys_ipl_device_show(struct kset *kset, char *page)
 281 {
 282         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 283
 284         switch (ipl_info.type) {
 285         case IPL_TYPE_CCW:
 286                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 287         case IPL_TYPE_FCP:
 288         case IPL_TYPE_FCP_DUMP:
 289                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 290         default:
 291                 return 0;
 292         }
 293 }
 294
 295 static struct subsys_attribute sys_ipl_device_attr =
 296         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 297
 298 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
 299                                   char *buf, loff_t off, size_t count)
 300 {
 301         unsigned int size = IPL_PARMBLOCK_SIZE;
 302
 303         if (off > size)
 304                 return 0;
 305         if (off + count > size)
 306                 count = size - off;
 307         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
 308         return count;
 309 }
 310
 311 static struct bin_attribute ipl_parameter_attr = {
 312         .attr = {
 313                 .name = "binary_parameter",
 314                 .mode = S_IRUGO,
 315         },
 316         .size = PAGE_SIZE,
 317         .read = &ipl_parameter_read,
 318 };
 319
 320 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
 321                                  char *buf, loff_t off, size_t count)
 322 {
 323         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 324         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 325
 326         if (off > size)
 327                 return 0;
 328         if (off + count > size)
 329                 count = size - off;
 330         memcpy(buf, scp_data + off, count);
 331         return count;
 332 }
 333
 334 static struct bin_attribute ipl_scp_data_attr = {
 335         .attr = {
 336                 .name = "scp_data",
 337                 .mode = S_IRUGO,
 338         },
 339         .size = PAGE_SIZE,
 340         .read = ipl_scp_data_read,
 341 };
 342
 343 /* FCP ipl device attributes */
 344
 345 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 346                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 347 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 348                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 349 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 350                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 351 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 352                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 353
 354 static struct attribute *ipl_fcp_attrs[] = {
 355         &sys_ipl_type_attr.attr,
 356         &sys_ipl_device_attr.attr,
 357         &sys_ipl_fcp_wwpn_attr.attr,
 358         &sys_ipl_fcp_lun_attr.attr,
 359         &sys_ipl_fcp_bootprog_attr.attr,
 360         &sys_ipl_fcp_br_lba_attr.attr,
 361         NULL,
 362 };
 363
 364 static struct attribute_group ipl_fcp_attr_group = {
 365         .attrs = ipl_fcp_attrs,
 366 };
 367
 368 /* CCW ipl device attributes */
 369
 370 static ssize_t ipl_ccw_loadparm_show(struct kset *kset, char *page)
 371 {
 372         char loadparm[LOADPARM_LEN + 1] = {};
 373
 374         if (!sclp_ipl_info.is_valid)
 375                 return sprintf(page, "#unknown#\n");
 376         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
 377         EBCASC(loadparm, LOADPARM_LEN);
 378         strstrip(loadparm);
 379         return sprintf(page, "%s\n", loadparm);
 380 }
 381
 382 static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
 383         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 384
 385 static struct attribute *ipl_ccw_attrs[] = {
 386         &sys_ipl_type_attr.attr,
 387         &sys_ipl_device_attr.attr,
 388         &sys_ipl_ccw_loadparm_attr.attr,
 389         NULL,
 390 };
 391
 392 static struct attribute_group ipl_ccw_attr_group = {
 393         .attrs = ipl_ccw_attrs,
 394 };
 395
 396 /* NSS ipl device attributes */
 397
 398 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
 399
 400 static struct attribute *ipl_nss_attrs[] = {
 401         &sys_ipl_type_attr.attr,
 402         &sys_ipl_nss_name_attr.attr,
 403         NULL,
 404 };
 405
 406 static struct attribute_group ipl_nss_attr_group = {
 407         .attrs = ipl_nss_attrs,
 408 };
 409
 410 /* UNKNOWN ipl device attributes */
 411
 412 static struct attribute *ipl_unknown_attrs[] = {
 413         &sys_ipl_type_attr.attr,
 414         NULL,
 415 };
 416
 417 static struct attribute_group ipl_unknown_attr_group = {
 418         .attrs = ipl_unknown_attrs,
 419 };
 420
 421 static decl_subsys(ipl, NULL, NULL);
 422
 423 /*
 424  * reipl section
 425  */
 426
 427 /* FCP reipl device attributes */
 428
 429 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 430                    reipl_block_fcp->ipl_info.fcp.wwpn);
 431 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
 432                    reipl_block_fcp->ipl_info.fcp.lun);
 433 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 434                    reipl_block_fcp->ipl_info.fcp.bootprog);
 435 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 436                    reipl_block_fcp->ipl_info.fcp.br_lba);
 437 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 438                    reipl_block_fcp->ipl_info.fcp.devno);
 439
 440 static struct attribute *reipl_fcp_attrs[] = {
 441         &sys_reipl_fcp_device_attr.attr,
 442         &sys_reipl_fcp_wwpn_attr.attr,
 443         &sys_reipl_fcp_lun_attr.attr,
 444         &sys_reipl_fcp_bootprog_attr.attr,
 445         &sys_reipl_fcp_br_lba_attr.attr,
 446         NULL,
 447 };
 448
 449 static struct attribute_group reipl_fcp_attr_group = {
 450         .name  = IPL_FCP_STR,
 451         .attrs = reipl_fcp_attrs,
 452 };
 453
 454 /* CCW reipl device attributes */
 455
 456 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 457         reipl_block_ccw->ipl_info.ccw.devno);
 458
 459 static void reipl_get_ascii_loadparm(char *loadparm)
 460 {
 461         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
 462                LOADPARM_LEN);
 463         EBCASC(loadparm, LOADPARM_LEN);
 464         loadparm[LOADPARM_LEN] = 0;
 465         strstrip(loadparm);
 466 }
 467
 468 static ssize_t reipl_ccw_loadparm_show(struct kset *kset, char *page)
 469 {
 470         char buf[LOADPARM_LEN + 1];
 471
 472         reipl_get_ascii_loadparm(buf);
 473         return sprintf(page, "%s\n", buf);
 474 }
 475
 476 static ssize_t reipl_ccw_loadparm_store(struct kset *kset,
 477                                         const char *buf, size_t len)
 478 {
 479         int i, lp_len;
 480
 481         /* ignore trailing newline */
 482         lp_len = len;
 483         if ((len > 0) && (buf[len - 1] == '\n'))
 484                 lp_len--;
 485         /* loadparm can have max 8 characters and must not start with a blank */
 486         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 487                 return -EINVAL;
 488         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 489         for (i = 0; i < lp_len; i++) {
 490                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 491                     (buf[i] == '.'))
 492                         continue;
 493                 return -EINVAL;
 494         }
 495         /* initialize loadparm with blanks */
 496         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
 497         /* copy and convert to ebcdic */
 498         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
 499         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
 500         return len;
 501 }
 502
 503 static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
 504         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
 505                reipl_ccw_loadparm_store);
 506
 507 static struct attribute *reipl_ccw_attrs[] = {
 508         &sys_reipl_ccw_device_attr.attr,
 509         &sys_reipl_ccw_loadparm_attr.attr,
 510         NULL,
 511 };
 512
 513 static struct attribute_group reipl_ccw_attr_group = {
 514         .name  = IPL_CCW_STR,
 515         .attrs = reipl_ccw_attrs,
 516 };
 517
 518
 519 /* NSS reipl device attributes */
 520
 521 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
 522
 523 static struct attribute *reipl_nss_attrs[] = {
 524         &sys_reipl_nss_name_attr.attr,
 525         NULL,
 526 };
 527
 528 static struct attribute_group reipl_nss_attr_group = {
 529         .name  = IPL_NSS_STR,
 530         .attrs = reipl_nss_attrs,
 531 };
 532
 533 /* reipl type */
 534
 535 static int reipl_set_type(enum ipl_type type)
 536 {
 537         if (!(reipl_capabilities & type))
 538                 return -EINVAL;
 539
 540         switch(type) {
 541         case IPL_TYPE_CCW:
 542                 if (MACHINE_IS_VM)
 543                         reipl_method = REIPL_METHOD_CCW_VM;
 544                 else
 545                         reipl_method = REIPL_METHOD_CCW_CIO;
 546                 break;
 547         case IPL_TYPE_FCP:
 548                 if (diag308_set_works)
 549                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
 550                 else if (MACHINE_IS_VM)
 551                         reipl_method = REIPL_METHOD_FCP_RO_VM;
 552                 else
 553                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
 554                 break;
 555         case IPL_TYPE_FCP_DUMP:
 556                 reipl_method = REIPL_METHOD_FCP_DUMP;
 557                 break;
 558         case IPL_TYPE_NSS:
 559                 reipl_method = REIPL_METHOD_NSS;
 560                 break;
 561         case IPL_TYPE_UNKNOWN:
 562                 reipl_method = REIPL_METHOD_DEFAULT;
 563                 break;
 564         default:
 565                 BUG();
 566         }
 567         reipl_type = type;
 568         return 0;
 569 }
 570
 571 static ssize_t reipl_type_show(struct kset *kset, char *page)
 572 {
 573         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
 574 }
 575
 576 static ssize_t reipl_type_store(struct kset *kset, const char *buf,
 577                                 size_t len)
 578 {
 579         int rc = -EINVAL;
 580
 581         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 582                 rc = reipl_set_type(IPL_TYPE_CCW);
 583         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 584                 rc = reipl_set_type(IPL_TYPE_FCP);
 585         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
 586                 rc = reipl_set_type(IPL_TYPE_NSS);
 587         return (rc != 0) ? rc : len;
 588 }
 589
 590 static struct subsys_attribute reipl_type_attr =
 591                 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
 592
 593 static decl_subsys(reipl, NULL, NULL);
 594
 595 /*
 596  * dump section
 597  */
 598
 599 /* FCP dump device attributes */
 600
 601 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 602                    dump_block_fcp->ipl_info.fcp.wwpn);
 603 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
 604                    dump_block_fcp->ipl_info.fcp.lun);
 605 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
 606                    dump_block_fcp->ipl_info.fcp.bootprog);
 607 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
 608                    dump_block_fcp->ipl_info.fcp.br_lba);
 609 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 610                    dump_block_fcp->ipl_info.fcp.devno);
 611
 612 static struct attribute *dump_fcp_attrs[] = {
 613         &sys_dump_fcp_device_attr.attr,
 614         &sys_dump_fcp_wwpn_attr.attr,
 615         &sys_dump_fcp_lun_attr.attr,
 616         &sys_dump_fcp_bootprog_attr.attr,
 617         &sys_dump_fcp_br_lba_attr.attr,
 618         NULL,
 619 };
 620
 621 static struct attribute_group dump_fcp_attr_group = {
 622         .name  = IPL_FCP_STR,
 623         .attrs = dump_fcp_attrs,
 624 };
 625
 626 /* CCW dump device attributes */
 627
 628 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 629                    dump_block_ccw->ipl_info.ccw.devno);
 630
 631 static struct attribute *dump_ccw_attrs[] = {
 632         &sys_dump_ccw_device_attr.attr,
 633         NULL,
 634 };
 635
 636 static struct attribute_group dump_ccw_attr_group = {
 637         .name  = IPL_CCW_STR,
 638         .attrs = dump_ccw_attrs,
 639 };
 640
 641 /* dump type */
 642
 643 static int dump_set_type(enum dump_type type)
 644 {
 645         if (!(dump_capabilities & type))
 646                 return -EINVAL;
 647         switch(type) {
 648         case DUMP_TYPE_CCW:
 649                 if (MACHINE_IS_VM)
 650                         dump_method = DUMP_METHOD_CCW_VM;
 651                 else
 652                         dump_method = DUMP_METHOD_CCW_CIO;
 653                 break;
 654         case DUMP_TYPE_FCP:
 655                 dump_method = DUMP_METHOD_FCP_DIAG;
 656                 break;
 657         default:
 658                 dump_method = DUMP_METHOD_NONE;
 659         }
 660         dump_type = type;
 661         return 0;
 662 }
 663
 664 static ssize_t dump_type_show(struct kset *kset, char *page)
 665 {
 666         return sprintf(page, "%s\n", dump_type_str(dump_type));
 667 }
 668
 669 static ssize_t dump_type_store(struct kset *kset, const char *buf,
 670                                size_t len)
 671 {
 672         int rc = -EINVAL;
 673
 674         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
 675                 rc = dump_set_type(DUMP_TYPE_NONE);
 676         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
 677                 rc = dump_set_type(DUMP_TYPE_CCW);
 678         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
 679                 rc = dump_set_type(DUMP_TYPE_FCP);
 680         return (rc != 0) ? rc : len;
 681 }
 682
 683 static struct subsys_attribute dump_type_attr =
 684                 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
 685
 686 static decl_subsys(dump, NULL, NULL);
 687
 688 /*
 689  * Shutdown actions section
 690  */
 691
 692 static decl_subsys(shutdown_actions, NULL, NULL);
 693
 694 /* on panic */
 695
 696 static ssize_t on_panic_show(struct kset *kset, char *page)
 697 {
 698         return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
 699 }
 700
 701 static ssize_t on_panic_store(struct kset *kset, const char *buf,
 702                               size_t len)
 703 {
 704         if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
 705                 on_panic_action = SHUTDOWN_REIPL;
 706         else if (strncmp(buf, SHUTDOWN_DUMP_STR,
 707                          strlen(SHUTDOWN_DUMP_STR)) == 0)
 708                 on_panic_action = SHUTDOWN_DUMP;
 709         else if (strncmp(buf, SHUTDOWN_STOP_STR,
 710                          strlen(SHUTDOWN_STOP_STR)) == 0)
 711                 on_panic_action = SHUTDOWN_STOP;
 712         else
 713                 return -EINVAL;
 714
 715         return len;
 716 }
 717
 718 static struct subsys_attribute on_panic_attr =
 719                 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
 720
 721 void do_reipl(void)
 722 {
 723         struct ccw_dev_id devid;
 724         static char buf[100];
 725         char loadparm[LOADPARM_LEN + 1];
 726
 727         switch (reipl_method) {
 728         case REIPL_METHOD_CCW_CIO:
 729                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
 730                 if (ipl_info.type == IPL_TYPE_CCW && devid.devno == ipl_devno)
 731                         diag308(DIAG308_IPL, NULL);
 732                 devid.ssid  = 0;
 733                 reipl_ccw_dev(&devid);
 734                 break;
 735         case REIPL_METHOD_CCW_VM:
 736                 reipl_get_ascii_loadparm(loadparm);
 737                 if (strlen(loadparm) == 0)
 738                         sprintf(buf, "IPL %X CLEAR",
 739                                 reipl_block_ccw->ipl_info.ccw.devno);
 740                 else
 741                         sprintf(buf, "IPL %X CLEAR LOADPARM '%s'",
 742                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
 743                 __cpcmd(buf, NULL, 0, NULL);
 744                 break;
 745         case REIPL_METHOD_CCW_DIAG:
 746                 diag308(DIAG308_SET, reipl_block_ccw);
 747                 diag308(DIAG308_IPL, NULL);
 748                 break;
 749         case REIPL_METHOD_FCP_RW_DIAG:
 750                 diag308(DIAG308_SET, reipl_block_fcp);
 751                 diag308(DIAG308_IPL, NULL);
 752                 break;
 753         case REIPL_METHOD_FCP_RO_DIAG:
 754                 diag308(DIAG308_IPL, NULL);
 755                 break;
 756         case REIPL_METHOD_FCP_RO_VM:
 757                 __cpcmd("IPL", NULL, 0, NULL);
 758                 break;
 759         case REIPL_METHOD_NSS:
 760                 sprintf(buf, "IPL %s", reipl_nss_name);
 761                 __cpcmd(buf, NULL, 0, NULL);
 762                 break;
 763         case REIPL_METHOD_DEFAULT:
 764                 if (MACHINE_IS_VM)
 765                         __cpcmd("IPL", NULL, 0, NULL);
 766                 diag308(DIAG308_IPL, NULL);
 767                 break;
 768         case REIPL_METHOD_FCP_DUMP:
 769         default:
 770                 break;
 771         }
 772         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 773 }
 774
 775 static void do_dump(void)
 776 {
 777         struct ccw_dev_id devid;
 778         static char buf[100];
 779
 780         switch (dump_method) {
 781         case DUMP_METHOD_CCW_CIO:
 782                 smp_send_stop();
 783                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
 784                 devid.ssid  = 0;
 785                 reipl_ccw_dev(&devid);
 786                 break;
 787         case DUMP_METHOD_CCW_VM:
 788                 smp_send_stop();
 789                 sprintf(buf, "STORE STATUS");
 790                 __cpcmd(buf, NULL, 0, NULL);
 791                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
 792                 __cpcmd(buf, NULL, 0, NULL);
 793                 break;
 794         case DUMP_METHOD_CCW_DIAG:
 795                 diag308(DIAG308_SET, dump_block_ccw);
 796                 diag308(DIAG308_DUMP, NULL);
 797                 break;
 798         case DUMP_METHOD_FCP_DIAG:
 799                 diag308(DIAG308_SET, dump_block_fcp);
 800                 diag308(DIAG308_DUMP, NULL);
 801                 break;
 802         case DUMP_METHOD_NONE:
 803         default:
 804                 return;
 805         }
 806         printk(KERN_EMERG "Dump failed!\n");
 807 }
 808
 809 /* init functions */
 810
 811 static int __init ipl_register_fcp_files(void)
 812 {
 813         int rc;
 814
 815         rc = sysfs_create_group(&ipl_subsys.kobj,
 816                                 &ipl_fcp_attr_group);
 817         if (rc)
 818                 goto out;
 819         rc = sysfs_create_bin_file(&ipl_subsys.kobj,
 820                                    &ipl_parameter_attr);
 821         if (rc)
 822                 goto out_ipl_parm;
 823         rc = sysfs_create_bin_file(&ipl_subsys.kobj,
 824                                    &ipl_scp_data_attr);
 825         if (!rc)
 826                 goto out;
 827
 828         sysfs_remove_bin_file(&ipl_subsys.kobj, &ipl_parameter_attr);
 829
 830 out_ipl_parm:
 831         sysfs_remove_group(&ipl_subsys.kobj, &ipl_fcp_attr_group);
 832 out:
 833         return rc;
 834 }
 835
 836 static int __init ipl_init(void)
 837 {
 838         int rc;
 839
 840         rc = firmware_register(&ipl_subsys);
 841         if (rc)
 842                 return rc;
 843         switch (ipl_info.type) {
 844         case IPL_TYPE_CCW:
 845                 rc = sysfs_create_group(&ipl_subsys.kobj,
 846                                         &ipl_ccw_attr_group);
 847                 break;
 848         case IPL_TYPE_FCP:
 849         case IPL_TYPE_FCP_DUMP:
 850                 rc = ipl_register_fcp_files();
 851                 break;
 852         case IPL_TYPE_NSS:
 853                 rc = sysfs_create_group(&ipl_subsys.kobj,
 854                                         &ipl_nss_attr_group);
 855                 break;
 856         default:
 857                 rc = sysfs_create_group(&ipl_subsys.kobj,
 858                                         &ipl_unknown_attr_group);
 859                 break;
 860         }
 861         if (rc)
 862                 firmware_unregister(&ipl_subsys);
 863         return rc;
 864 }
 865
 866 static void __init reipl_probe(void)
 867 {
 868         void *buffer;
 869
 870         buffer = (void *) get_zeroed_page(GFP_KERNEL);
 871         if (!buffer)
 872                 return;
 873         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
 874                 diag308_set_works = 1;
 875         free_page((unsigned long)buffer);
 876 }
 877
 878 static int __init reipl_nss_init(void)
 879 {
 880         int rc;
 881
 882         if (!MACHINE_IS_VM)
 883                 return 0;
 884         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_nss_attr_group);
 885         if (rc)
 886                 return rc;
 887         strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
 888         reipl_capabilities |= IPL_TYPE_NSS;
 889         return 0;
 890 }
 891
 892 static int __init reipl_ccw_init(void)
 893 {
 894         int rc;
 895
 896         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 897         if (!reipl_block_ccw)
 898                 return -ENOMEM;
 899         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_ccw_attr_group);
 900         if (rc) {
 901                 free_page((unsigned long)reipl_block_ccw);
 902                 return rc;
 903         }
 904         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 905         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 906         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 907         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 908         /* check if read scp info worked and set loadparm */
 909         if (sclp_ipl_info.is_valid)
 910                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
 911                        &sclp_ipl_info.loadparm, LOADPARM_LEN);
 912         else
 913                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
 914                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
 915                        LOADPARM_LEN);
 916         /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
 917         if (!MACHINE_IS_VM)
 918                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
 919         if (ipl_info.type == IPL_TYPE_CCW)
 920                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
 921         reipl_capabilities |= IPL_TYPE_CCW;
 922         return 0;
 923 }
 924
 925 static int __init reipl_fcp_init(void)
 926 {
 927         int rc;
 928
 929         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
 930                 return 0;
 931         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
 932                 make_attrs_ro(reipl_fcp_attrs);
 933
 934         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 935         if (!reipl_block_fcp)
 936                 return -ENOMEM;
 937         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_fcp_attr_group);
 938         if (rc) {
 939                 free_page((unsigned long)reipl_block_fcp);
 940                 return rc;
 941         }
 942         if (ipl_info.type == IPL_TYPE_FCP) {
 943                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
 944         } else {
 945                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 946                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
 947                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
 948                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
 949                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
 950         }
 951         reipl_capabilities |= IPL_TYPE_FCP;
 952         return 0;
 953 }
 954
 955 static int __init reipl_init(void)
 956 {
 957         int rc;
 958
 959         rc = firmware_register(&reipl_subsys);
 960         if (rc)
 961                 return rc;
 962         rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
 963         if (rc) {
 964                 firmware_unregister(&reipl_subsys);
 965                 return rc;
 966         }
 967         rc = reipl_ccw_init();
 968         if (rc)
 969                 return rc;
 970         rc = reipl_fcp_init();
 971         if (rc)
 972                 return rc;
 973         rc = reipl_nss_init();
 974         if (rc)
 975                 return rc;
 976         rc = reipl_set_type(ipl_info.type);
 977         if (rc)
 978                 return rc;
 979         return 0;
 980 }
 981
 982 static int __init dump_ccw_init(void)
 983 {
 984         int rc;
 985
 986         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 987         if (!dump_block_ccw)
 988                 return -ENOMEM;
 989         rc = sysfs_create_group(&dump_subsys.kobj, &dump_ccw_attr_group);
 990         if (rc) {
 991                 free_page((unsigned long)dump_block_ccw);
 992                 return rc;
 993         }
 994         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 995         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 996         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 997         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 998         dump_capabilities |= DUMP_TYPE_CCW;
 999         return 0;
1000 }
1001
1002 static int __init dump_fcp_init(void)
1003 {
1004         int rc;
1005
1006         if (!sclp_ipl_info.has_dump)
1007                 return 0; /* LDIPL DUMP is not installed */
1008         if (!diag308_set_works)
1009                 return 0;
1010         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1011         if (!dump_block_fcp)
1012                 return -ENOMEM;
1013         rc = sysfs_create_group(&dump_subsys.kobj, &dump_fcp_attr_group);
1014         if (rc) {
1015                 free_page((unsigned long)dump_block_fcp);
1016                 return rc;
1017         }
1018         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1019         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1020         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1021         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1022         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1023         dump_capabilities |= DUMP_TYPE_FCP;
1024         return 0;
1025 }
1026
1027 #define SHUTDOWN_ON_PANIC_PRIO 0
1028
1029 static int shutdown_on_panic_notify(struct notifier_block *self,
1030                                     unsigned long event, void *data)
1031 {
1032         if (on_panic_action == SHUTDOWN_DUMP)
1033                 do_dump();
1034         else if (on_panic_action == SHUTDOWN_REIPL)
1035                 do_reipl();
1036         return NOTIFY_OK;
1037 }
1038
1039 static struct notifier_block shutdown_on_panic_nb = {
1040         .notifier_call = shutdown_on_panic_notify,
1041         .priority = SHUTDOWN_ON_PANIC_PRIO
1042 };
1043
1044 static int __init dump_init(void)
1045 {
1046         int rc;
1047
1048         rc = firmware_register(&dump_subsys);
1049         if (rc)
1050                 return rc;
1051         rc = subsys_create_file(&dump_subsys, &dump_type_attr);
1052         if (rc) {
1053                 firmware_unregister(&dump_subsys);
1054                 return rc;
1055         }
1056         rc = dump_ccw_init();
1057         if (rc)
1058                 return rc;
1059         rc = dump_fcp_init();
1060         if (rc)
1061                 return rc;
1062         dump_set_type(DUMP_TYPE_NONE);
1063         return 0;
1064 }
1065
1066 static int __init shutdown_actions_init(void)
1067 {
1068         int rc;
1069
1070         rc = firmware_register(&shutdown_actions_subsys);
1071         if (rc)
1072                 return rc;
1073         rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
1074         if (rc) {
1075                 firmware_unregister(&shutdown_actions_subsys);
1076                 return rc;
1077         }
1078         atomic_notifier_chain_register(&panic_notifier_list,
1079                                        &shutdown_on_panic_nb);
1080         return 0;
1081 }
1082
1083 static int __init s390_ipl_init(void)
1084 {
1085         int rc;
1086
1087         sclp_get_ipl_info(&sclp_ipl_info);
1088         reipl_probe();
1089         rc = ipl_init();
1090         if (rc)
1091                 return rc;
1092         rc = reipl_init();
1093         if (rc)
1094                 return rc;
1095         rc = dump_init();
1096         if (rc)
1097                 return rc;
1098         rc = shutdown_actions_init();
1099         if (rc)
1100                 return rc;
1101         return 0;
1102 }
1103
1104 __initcall(s390_ipl_init);
1105
1106 void __init ipl_save_parameters(void)
1107 {
1108         struct cio_iplinfo iplinfo;
1109         unsigned int *ipl_ptr;
1110         void *src, *dst;
1111
1112         if (cio_get_iplinfo(&iplinfo))
1113                 return;
1114
1115         ipl_devno = iplinfo.devno;
1116         ipl_flags |= IPL_DEVNO_VALID;
1117         if (!iplinfo.is_qdio)
1118                 return;
1119         ipl_flags |= IPL_PARMBLOCK_VALID;
1120         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1121         src = (void *)(unsigned long)*ipl_ptr;
1122         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1123         memmove(dst, src, PAGE_SIZE);
1124         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1125 }
1126
1127 static LIST_HEAD(rcall);
1128 static DEFINE_MUTEX(rcall_mutex);
1129
1130 void register_reset_call(struct reset_call *reset)
1131 {
1132         mutex_lock(&rcall_mutex);
1133         list_add(&reset->list, &rcall);
1134         mutex_unlock(&rcall_mutex);
1135 }
1136 EXPORT_SYMBOL_GPL(register_reset_call);
1137
1138 void unregister_reset_call(struct reset_call *reset)
1139 {
1140         mutex_lock(&rcall_mutex);
1141         list_del(&reset->list);
1142         mutex_unlock(&rcall_mutex);
1143 }
1144 EXPORT_SYMBOL_GPL(unregister_reset_call);
1145
1146 static void do_reset_calls(void)
1147 {
1148         struct reset_call *reset;
1149
1150         list_for_each_entry(reset, &rcall, list)
1151                 reset->fn();
1152 }
1153
1154 u32 dump_prefix_page;
1155
1156 void s390_reset_system(void)
1157 {
1158         struct _lowcore *lc;
1159
1160         lc = (struct _lowcore *)(unsigned long) store_prefix();
1161
1162         /* Stack for interrupt/machine check handler */
1163         lc->panic_stack = S390_lowcore.panic_stack;
1164
1165         /* Save prefix page address for dump case */
1166         dump_prefix_page = (u32)(unsigned long) lc;
1167
1168         /* Disable prefixing */
1169         set_prefix(0);
1170
1171         /* Disable lowcore protection */
1172         __ctl_clear_bit(0,28);
1173
1174         /* Set new machine check handler */
1175         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1176         S390_lowcore.mcck_new_psw.addr =
1177                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1178
1179         /* Set new program check handler */
1180         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1181         S390_lowcore.program_new_psw.addr =
1182                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1183
1184         do_reset_calls();
1185 }