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   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/smp.h>
  18 #include <asm/setup.h>
  19 #include <asm/cpcmd.h>
  20 #include <asm/cio.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/reset.h>
  23
  24 #define IPL_PARM_BLOCK_VERSION 0
  25 #define LOADPARM_LEN 8
  26
  27 extern char s390_readinfo_sccb[];
  28 #define SCCB_VALID (*((__u16*)&s390_readinfo_sccb[6]) == 0x0010)
  29 #define SCCB_LOADPARM (&s390_readinfo_sccb[24])
  30 #define SCCB_FLAG (s390_readinfo_sccb[91])
  31
  32 enum ipl_type {
  33         IPL_TYPE_NONE    = 1,
  34         IPL_TYPE_UNKNOWN = 2,
  35         IPL_TYPE_CCW     = 4,
  36         IPL_TYPE_FCP     = 8,
  37 };
  38
  39 #define IPL_NONE_STR     "none"
  40 #define IPL_UNKNOWN_STR  "unknown"
  41 #define IPL_CCW_STR      "ccw"
  42 #define IPL_FCP_STR      "fcp"
  43
  44 static char *ipl_type_str(enum ipl_type type)
  45 {
  46         switch (type) {
  47         case IPL_TYPE_NONE:
  48                 return IPL_NONE_STR;
  49         case IPL_TYPE_CCW:
  50                 return IPL_CCW_STR;
  51         case IPL_TYPE_FCP:
  52                 return IPL_FCP_STR;
  53         case IPL_TYPE_UNKNOWN:
  54         default:
  55                 return IPL_UNKNOWN_STR;
  56         }
  57 }
  58
  59 enum ipl_method {
  60         IPL_METHOD_NONE,
  61         IPL_METHOD_CCW_CIO,
  62         IPL_METHOD_CCW_DIAG,
  63         IPL_METHOD_CCW_VM,
  64         IPL_METHOD_FCP_RO_DIAG,
  65         IPL_METHOD_FCP_RW_DIAG,
  66         IPL_METHOD_FCP_RO_VM,
  67 };
  68
  69 enum shutdown_action {
  70         SHUTDOWN_REIPL,
  71         SHUTDOWN_DUMP,
  72         SHUTDOWN_STOP,
  73 };
  74
  75 #define SHUTDOWN_REIPL_STR "reipl"
  76 #define SHUTDOWN_DUMP_STR  "dump"
  77 #define SHUTDOWN_STOP_STR  "stop"
  78
  79 static char *shutdown_action_str(enum shutdown_action action)
  80 {
  81         switch (action) {
  82         case SHUTDOWN_REIPL:
  83                 return SHUTDOWN_REIPL_STR;
  84         case SHUTDOWN_DUMP:
  85                 return SHUTDOWN_DUMP_STR;
  86         case SHUTDOWN_STOP:
  87                 return SHUTDOWN_STOP_STR;
  88         default:
  89                 BUG();
  90         }
  91 }
  92
  93 enum diag308_subcode  {
  94         DIAG308_IPL   = 3,
  95         DIAG308_DUMP  = 4,
  96         DIAG308_SET   = 5,
  97         DIAG308_STORE = 6,
  98 };
  99
 100 enum diag308_ipl_type {
 101         DIAG308_IPL_TYPE_FCP = 0,
 102         DIAG308_IPL_TYPE_CCW = 2,
 103 };
 104
 105 enum diag308_opt {
 106         DIAG308_IPL_OPT_IPL  = 0x10,
 107         DIAG308_IPL_OPT_DUMP = 0x20,
 108 };
 109
 110 enum diag308_rc {
 111         DIAG308_RC_OK = 1,
 112 };
 113
 114 static int diag308_set_works = 0;
 115
 116 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 117 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 118 static enum ipl_method reipl_method = IPL_METHOD_NONE;
 119 static struct ipl_parameter_block *reipl_block_fcp;
 120 static struct ipl_parameter_block *reipl_block_ccw;
 121
 122 static int dump_capabilities = IPL_TYPE_NONE;
 123 static enum ipl_type dump_type = IPL_TYPE_NONE;
 124 static enum ipl_method dump_method = IPL_METHOD_NONE;
 125 static struct ipl_parameter_block *dump_block_fcp;
 126 static struct ipl_parameter_block *dump_block_ccw;
 127
 128 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
 129
 130 static int diag308(unsigned long subcode, void *addr)
 131 {
 132         register unsigned long _addr asm("0") = (unsigned long) addr;
 133         register unsigned long _rc asm("1") = 0;
 134
 135         asm volatile(
 136                 "       diag    %0,%2,0x308\n"
 137                 "0:\n"
 138                 EX_TABLE(0b,0b)
 139                 : "+d" (_addr), "+d" (_rc)
 140                 : "d" (subcode) : "cc", "memory");
 141         return _rc;
 142 }
 143
 144 /* SYSFS */
 145
 146 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 147 static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
 148                 char *page)                                             \
 149 {                                                                       \
 150         return sprintf(page, _format, _value);                          \
 151 }                                                                       \
 152 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
 153         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
 154
 155 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 156 static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
 157                 char *page)                                             \
 158 {                                                                       \
 159         return sprintf(page, _fmt_out,                                  \
 160                         (unsigned long long) _value);                   \
 161 }                                                                       \
 162 static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
 163                 const char *buf, size_t len)                            \
 164 {                                                                       \
 165         unsigned long long value;                                       \
 166         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 167                 return -EINVAL;                                         \
 168         _value = value;                                                 \
 169         return len;                                                     \
 170 }                                                                       \
 171 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
 172         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 173                         sys_##_prefix##_##_name##_show,                 \
 174                         sys_##_prefix##_##_name##_store);
 175
 176 static void make_attrs_ro(struct attribute **attrs)
 177 {
 178         while (*attrs) {
 179                 (*attrs)->mode = S_IRUGO;
 180                 attrs++;
 181         }
 182 }
 183
 184 /*
 185  * ipl section
 186  */
 187
 188 static enum ipl_type ipl_get_type(void)
 189 {
 190         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 191
 192         if (!(ipl_flags & IPL_DEVNO_VALID))
 193                 return IPL_TYPE_UNKNOWN;
 194         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 195                 return IPL_TYPE_CCW;
 196         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 197                 return IPL_TYPE_UNKNOWN;
 198         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 199                 return IPL_TYPE_UNKNOWN;
 200         return IPL_TYPE_FCP;
 201 }
 202
 203 static ssize_t ipl_type_show(struct subsystem *subsys, char *page)
 204 {
 205         return sprintf(page, "%s\n", ipl_type_str(ipl_get_type()));
 206 }
 207
 208 static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 209
 210 static ssize_t sys_ipl_device_show(struct subsystem *subsys, char *page)
 211 {
 212         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 213
 214         switch (ipl_get_type()) {
 215         case IPL_TYPE_CCW:
 216                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 217         case IPL_TYPE_FCP:
 218                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 219         default:
 220                 return 0;
 221         }
 222 }
 223
 224 static struct subsys_attribute sys_ipl_device_attr =
 225         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 226
 227 static ssize_t ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off,
 228                                   size_t count)
 229 {
 230         unsigned int size = IPL_PARMBLOCK_SIZE;
 231
 232         if (off > size)
 233                 return 0;
 234         if (off + count > size)
 235                 count = size - off;
 236         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
 237         return count;
 238 }
 239
 240 static struct bin_attribute ipl_parameter_attr = {
 241         .attr = {
 242                 .name = "binary_parameter",
 243                 .mode = S_IRUGO,
 244                 .owner = THIS_MODULE,
 245         },
 246         .size = PAGE_SIZE,
 247         .read = &ipl_parameter_read,
 248 };
 249
 250 static ssize_t ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off,
 251         size_t count)
 252 {
 253         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 254         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 255
 256         if (off > size)
 257                 return 0;
 258         if (off + count > size)
 259                 count = size - off;
 260         memcpy(buf, scp_data + off, count);
 261         return count;
 262 }
 263
 264 static struct bin_attribute ipl_scp_data_attr = {
 265         .attr = {
 266                 .name = "scp_data",
 267                 .mode = S_IRUGO,
 268                 .owner = THIS_MODULE,
 269         },
 270         .size = PAGE_SIZE,
 271         .read = &ipl_scp_data_read,
 272 };
 273
 274 /* FCP ipl device attributes */
 275
 276 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 277                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 278 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 279                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 280 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 281                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 282 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 283                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 284
 285 static struct attribute *ipl_fcp_attrs[] = {
 286         &sys_ipl_type_attr.attr,
 287         &sys_ipl_device_attr.attr,
 288         &sys_ipl_fcp_wwpn_attr.attr,
 289         &sys_ipl_fcp_lun_attr.attr,
 290         &sys_ipl_fcp_bootprog_attr.attr,
 291         &sys_ipl_fcp_br_lba_attr.attr,
 292         NULL,
 293 };
 294
 295 static struct attribute_group ipl_fcp_attr_group = {
 296         .attrs = ipl_fcp_attrs,
 297 };
 298
 299 /* CCW ipl device attributes */
 300
 301 static ssize_t ipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
 302 {
 303         char loadparm[LOADPARM_LEN + 1] = {};
 304
 305         if (!SCCB_VALID)
 306                 return sprintf(page, "#unknown#\n");
 307         memcpy(loadparm, SCCB_LOADPARM, LOADPARM_LEN);
 308         EBCASC(loadparm, LOADPARM_LEN);
 309         strstrip(loadparm);
 310         return sprintf(page, "%s\n", loadparm);
 311 }
 312
 313 static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
 314         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 315
 316 static struct attribute *ipl_ccw_attrs[] = {
 317         &sys_ipl_type_attr.attr,
 318         &sys_ipl_device_attr.attr,
 319         &sys_ipl_ccw_loadparm_attr.attr,
 320         NULL,
 321 };
 322
 323 static struct attribute_group ipl_ccw_attr_group = {
 324         .attrs = ipl_ccw_attrs,
 325 };
 326
 327 /* UNKNOWN ipl device attributes */
 328
 329 static struct attribute *ipl_unknown_attrs[] = {
 330         &sys_ipl_type_attr.attr,
 331         NULL,
 332 };
 333
 334 static struct attribute_group ipl_unknown_attr_group = {
 335         .attrs = ipl_unknown_attrs,
 336 };
 337
 338 static decl_subsys(ipl, NULL, NULL);
 339
 340 /*
 341  * reipl section
 342  */
 343
 344 /* FCP reipl device attributes */
 345
 346 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 347                    reipl_block_fcp->ipl_info.fcp.wwpn);
 348 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
 349                    reipl_block_fcp->ipl_info.fcp.lun);
 350 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 351                    reipl_block_fcp->ipl_info.fcp.bootprog);
 352 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 353                    reipl_block_fcp->ipl_info.fcp.br_lba);
 354 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 355                    reipl_block_fcp->ipl_info.fcp.devno);
 356
 357 static struct attribute *reipl_fcp_attrs[] = {
 358         &sys_reipl_fcp_device_attr.attr,
 359         &sys_reipl_fcp_wwpn_attr.attr,
 360         &sys_reipl_fcp_lun_attr.attr,
 361         &sys_reipl_fcp_bootprog_attr.attr,
 362         &sys_reipl_fcp_br_lba_attr.attr,
 363         NULL,
 364 };
 365
 366 static struct attribute_group reipl_fcp_attr_group = {
 367         .name  = IPL_FCP_STR,
 368         .attrs = reipl_fcp_attrs,
 369 };
 370
 371 /* CCW reipl device attributes */
 372
 373 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 374         reipl_block_ccw->ipl_info.ccw.devno);
 375
 376 static void reipl_get_ascii_loadparm(char *loadparm)
 377 {
 378         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
 379                LOADPARM_LEN);
 380         EBCASC(loadparm, LOADPARM_LEN);
 381         loadparm[LOADPARM_LEN] = 0;
 382         strstrip(loadparm);
 383 }
 384
 385 static ssize_t reipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
 386 {
 387         char buf[LOADPARM_LEN + 1];
 388
 389         reipl_get_ascii_loadparm(buf);
 390         return sprintf(page, "%s\n", buf);
 391 }
 392
 393 static ssize_t reipl_ccw_loadparm_store(struct subsystem *subsys,
 394                                         const char *buf, size_t len)
 395 {
 396         int i, lp_len;
 397
 398         /* ignore trailing newline */
 399         lp_len = len;
 400         if ((len > 0) && (buf[len - 1] == '\n'))
 401                 lp_len--;
 402         /* loadparm can have max 8 characters and must not start with a blank */
 403         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 404                 return -EINVAL;
 405         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 406         for (i = 0; i < lp_len; i++) {
 407                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 408                     (buf[i] == '.'))
 409                         continue;
 410                 return -EINVAL;
 411         }
 412         /* initialize loadparm with blanks */
 413         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
 414         /* copy and convert to ebcdic */
 415         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
 416         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
 417         return len;
 418 }
 419
 420 static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
 421         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
 422                reipl_ccw_loadparm_store);
 423
 424 static struct attribute *reipl_ccw_attrs[] = {
 425         &sys_reipl_ccw_device_attr.attr,
 426         &sys_reipl_ccw_loadparm_attr.attr,
 427         NULL,
 428 };
 429
 430 static struct attribute_group reipl_ccw_attr_group = {
 431         .name  = IPL_CCW_STR,
 432         .attrs = reipl_ccw_attrs,
 433 };
 434
 435 /* reipl type */
 436
 437 static int reipl_set_type(enum ipl_type type)
 438 {
 439         if (!(reipl_capabilities & type))
 440                 return -EINVAL;
 441
 442         switch(type) {
 443         case IPL_TYPE_CCW:
 444                 if (MACHINE_IS_VM)
 445                         reipl_method = IPL_METHOD_CCW_VM;
 446                 else
 447                         reipl_method = IPL_METHOD_CCW_CIO;
 448                 break;
 449         case IPL_TYPE_FCP:
 450                 if (diag308_set_works)
 451                         reipl_method = IPL_METHOD_FCP_RW_DIAG;
 452                 else if (MACHINE_IS_VM)
 453                         reipl_method = IPL_METHOD_FCP_RO_VM;
 454                 else
 455                         reipl_method = IPL_METHOD_FCP_RO_DIAG;
 456                 break;
 457         default:
 458                 reipl_method = IPL_METHOD_NONE;
 459         }
 460         reipl_type = type;
 461         return 0;
 462 }
 463
 464 static ssize_t reipl_type_show(struct subsystem *subsys, char *page)
 465 {
 466         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
 467 }
 468
 469 static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
 470                                 size_t len)
 471 {
 472         int rc = -EINVAL;
 473
 474         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 475                 rc = reipl_set_type(IPL_TYPE_CCW);
 476         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 477                 rc = reipl_set_type(IPL_TYPE_FCP);
 478         return (rc != 0) ? rc : len;
 479 }
 480
 481 static struct subsys_attribute reipl_type_attr =
 482                 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
 483
 484 static decl_subsys(reipl, NULL, NULL);
 485
 486 /*
 487  * dump section
 488  */
 489
 490 /* FCP dump device attributes */
 491
 492 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 493                    dump_block_fcp->ipl_info.fcp.wwpn);
 494 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
 495                    dump_block_fcp->ipl_info.fcp.lun);
 496 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
 497                    dump_block_fcp->ipl_info.fcp.bootprog);
 498 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
 499                    dump_block_fcp->ipl_info.fcp.br_lba);
 500 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 501                    dump_block_fcp->ipl_info.fcp.devno);
 502
 503 static struct attribute *dump_fcp_attrs[] = {
 504         &sys_dump_fcp_device_attr.attr,
 505         &sys_dump_fcp_wwpn_attr.attr,
 506         &sys_dump_fcp_lun_attr.attr,
 507         &sys_dump_fcp_bootprog_attr.attr,
 508         &sys_dump_fcp_br_lba_attr.attr,
 509         NULL,
 510 };
 511
 512 static struct attribute_group dump_fcp_attr_group = {
 513         .name  = IPL_FCP_STR,
 514         .attrs = dump_fcp_attrs,
 515 };
 516
 517 /* CCW dump device attributes */
 518
 519 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 520                    dump_block_ccw->ipl_info.ccw.devno);
 521
 522 static struct attribute *dump_ccw_attrs[] = {
 523         &sys_dump_ccw_device_attr.attr,
 524         NULL,
 525 };
 526
 527 static struct attribute_group dump_ccw_attr_group = {
 528         .name  = IPL_CCW_STR,
 529         .attrs = dump_ccw_attrs,
 530 };
 531
 532 /* dump type */
 533
 534 static int dump_set_type(enum ipl_type type)
 535 {
 536         if (!(dump_capabilities & type))
 537                 return -EINVAL;
 538         switch(type) {
 539         case IPL_TYPE_CCW:
 540                 if (MACHINE_IS_VM)
 541                         dump_method = IPL_METHOD_CCW_VM;
 542                 else
 543                         dump_method = IPL_METHOD_CCW_CIO;
 544                 break;
 545         case IPL_TYPE_FCP:
 546                 dump_method = IPL_METHOD_FCP_RW_DIAG;
 547                 break;
 548         default:
 549                 dump_method = IPL_METHOD_NONE;
 550         }
 551         dump_type = type;
 552         return 0;
 553 }
 554
 555 static ssize_t dump_type_show(struct subsystem *subsys, char *page)
 556 {
 557         return sprintf(page, "%s\n", ipl_type_str(dump_type));
 558 }
 559
 560 static ssize_t dump_type_store(struct subsystem *subsys, const char *buf,
 561                                size_t len)
 562 {
 563         int rc = -EINVAL;
 564
 565         if (strncmp(buf, IPL_NONE_STR, strlen(IPL_NONE_STR)) == 0)
 566                 rc = dump_set_type(IPL_TYPE_NONE);
 567         else if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 568                 rc = dump_set_type(IPL_TYPE_CCW);
 569         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 570                 rc = dump_set_type(IPL_TYPE_FCP);
 571         return (rc != 0) ? rc : len;
 572 }
 573
 574 static struct subsys_attribute dump_type_attr =
 575                 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
 576
 577 static decl_subsys(dump, NULL, NULL);
 578
 579 /*
 580  * Shutdown actions section
 581  */
 582
 583 static decl_subsys(shutdown_actions, NULL, NULL);
 584
 585 /* on panic */
 586
 587 static ssize_t on_panic_show(struct subsystem *subsys, char *page)
 588 {
 589         return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
 590 }
 591
 592 static ssize_t on_panic_store(struct subsystem *subsys, const char *buf,
 593                               size_t len)
 594 {
 595         if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
 596                 on_panic_action = SHUTDOWN_REIPL;
 597         else if (strncmp(buf, SHUTDOWN_DUMP_STR,
 598                          strlen(SHUTDOWN_DUMP_STR)) == 0)
 599                 on_panic_action = SHUTDOWN_DUMP;
 600         else if (strncmp(buf, SHUTDOWN_STOP_STR,
 601                          strlen(SHUTDOWN_STOP_STR)) == 0)
 602                 on_panic_action = SHUTDOWN_STOP;
 603         else
 604                 return -EINVAL;
 605
 606         return len;
 607 }
 608
 609 static struct subsys_attribute on_panic_attr =
 610                 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
 611
 612 void do_reipl(void)
 613 {
 614         struct ccw_dev_id devid;
 615         static char buf[100];
 616         char loadparm[LOADPARM_LEN + 1];
 617
 618         switch (reipl_method) {
 619         case IPL_METHOD_CCW_CIO:
 620                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
 621                 if (ipl_get_type() == IPL_TYPE_CCW && devid.devno == ipl_devno)
 622                         diag308(DIAG308_IPL, NULL);
 623                 devid.ssid  = 0;
 624                 reipl_ccw_dev(&devid);
 625                 break;
 626         case IPL_METHOD_CCW_VM:
 627                 reipl_get_ascii_loadparm(loadparm);
 628                 if (strlen(loadparm) == 0)
 629                         sprintf(buf, "IPL %X",
 630                                 reipl_block_ccw->ipl_info.ccw.devno);
 631                 else
 632                         sprintf(buf, "IPL %X LOADPARM '%s'",
 633                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
 634                 __cpcmd(buf, NULL, 0, NULL);
 635                 break;
 636         case IPL_METHOD_CCW_DIAG:
 637                 diag308(DIAG308_SET, reipl_block_ccw);
 638                 diag308(DIAG308_IPL, NULL);
 639                 break;
 640         case IPL_METHOD_FCP_RW_DIAG:
 641                 diag308(DIAG308_SET, reipl_block_fcp);
 642                 diag308(DIAG308_IPL, NULL);
 643                 break;
 644         case IPL_METHOD_FCP_RO_DIAG:
 645                 diag308(DIAG308_IPL, NULL);
 646                 break;
 647         case IPL_METHOD_FCP_RO_VM:
 648                 __cpcmd("IPL", NULL, 0, NULL);
 649                 break;
 650         case IPL_METHOD_NONE:
 651         default:
 652                 if (MACHINE_IS_VM)
 653                         __cpcmd("IPL", NULL, 0, NULL);
 654                 diag308(DIAG308_IPL, NULL);
 655                 break;
 656         }
 657         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 658 }
 659
 660 static void do_dump(void)
 661 {
 662         struct ccw_dev_id devid;
 663         static char buf[100];
 664
 665         switch (dump_method) {
 666         case IPL_METHOD_CCW_CIO:
 667                 smp_send_stop();
 668                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
 669                 devid.ssid  = 0;
 670                 reipl_ccw_dev(&devid);
 671                 break;
 672         case IPL_METHOD_CCW_VM:
 673                 smp_send_stop();
 674                 sprintf(buf, "STORE STATUS");
 675                 __cpcmd(buf, NULL, 0, NULL);
 676                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
 677                 __cpcmd(buf, NULL, 0, NULL);
 678                 break;
 679         case IPL_METHOD_CCW_DIAG:
 680                 diag308(DIAG308_SET, dump_block_ccw);
 681                 diag308(DIAG308_DUMP, NULL);
 682                 break;
 683         case IPL_METHOD_FCP_RW_DIAG:
 684                 diag308(DIAG308_SET, dump_block_fcp);
 685                 diag308(DIAG308_DUMP, NULL);
 686                 break;
 687         case IPL_METHOD_NONE:
 688         default:
 689                 return;
 690         }
 691         printk(KERN_EMERG "Dump failed!\n");
 692 }
 693
 694 /* init functions */
 695
 696 static int __init ipl_register_fcp_files(void)
 697 {
 698         int rc;
 699
 700         rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 701                                 &ipl_fcp_attr_group);
 702         if (rc)
 703                 goto out;
 704         rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 705                                    &ipl_parameter_attr);
 706         if (rc)
 707                 goto out_ipl_parm;
 708         rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 709                                    &ipl_scp_data_attr);
 710         if (!rc)
 711                 goto out;
 712
 713         sysfs_remove_bin_file(&ipl_subsys.kset.kobj, &ipl_parameter_attr);
 714
 715 out_ipl_parm:
 716         sysfs_remove_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
 717 out:
 718         return rc;
 719 }
 720
 721 static int __init ipl_init(void)
 722 {
 723         int rc;
 724
 725         rc = firmware_register(&ipl_subsys);
 726         if (rc)
 727                 return rc;
 728         switch (ipl_get_type()) {
 729         case IPL_TYPE_CCW:
 730                 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 731                                         &ipl_ccw_attr_group);
 732                 break;
 733         case IPL_TYPE_FCP:
 734                 rc = ipl_register_fcp_files();
 735                 break;
 736         default:
 737                 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 738                                         &ipl_unknown_attr_group);
 739                 break;
 740         }
 741         if (rc)
 742                 firmware_unregister(&ipl_subsys);
 743         return rc;
 744 }
 745
 746 static void __init reipl_probe(void)
 747 {
 748         void *buffer;
 749
 750         buffer = (void *) get_zeroed_page(GFP_KERNEL);
 751         if (!buffer)
 752                 return;
 753         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
 754                 diag308_set_works = 1;
 755         free_page((unsigned long)buffer);
 756 }
 757
 758 static int __init reipl_ccw_init(void)
 759 {
 760         int rc;
 761
 762         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 763         if (!reipl_block_ccw)
 764                 return -ENOMEM;
 765         rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_ccw_attr_group);
 766         if (rc) {
 767                 free_page((unsigned long)reipl_block_ccw);
 768                 return rc;
 769         }
 770         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 771         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 772         reipl_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
 773         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 774         /* check if read scp info worked and set loadparm */
 775         if (SCCB_VALID)
 776                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
 777                        SCCB_LOADPARM, LOADPARM_LEN);
 778         else
 779                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
 780                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
 781                        LOADPARM_LEN);
 782         /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
 783         if (!MACHINE_IS_VM)
 784                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
 785         if (ipl_get_type() == IPL_TYPE_CCW)
 786                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
 787         reipl_capabilities |= IPL_TYPE_CCW;
 788         return 0;
 789 }
 790
 791 static int __init reipl_fcp_init(void)
 792 {
 793         int rc;
 794
 795         if ((!diag308_set_works) && (ipl_get_type() != IPL_TYPE_FCP))
 796                 return 0;
 797         if ((!diag308_set_works) && (ipl_get_type() == IPL_TYPE_FCP))
 798                 make_attrs_ro(reipl_fcp_attrs);
 799
 800         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 801         if (!reipl_block_fcp)
 802                 return -ENOMEM;
 803         rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_fcp_attr_group);
 804         if (rc) {
 805                 free_page((unsigned long)reipl_block_fcp);
 806                 return rc;
 807         }
 808         if (ipl_get_type() == IPL_TYPE_FCP) {
 809                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
 810         } else {
 811                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 812                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
 813                 reipl_block_fcp->hdr.blk0_len =
 814                         sizeof(reipl_block_fcp->ipl_info.fcp);
 815                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
 816                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
 817         }
 818         reipl_capabilities |= IPL_TYPE_FCP;
 819         return 0;
 820 }
 821
 822 static int __init reipl_init(void)
 823 {
 824         int rc;
 825
 826         rc = firmware_register(&reipl_subsys);
 827         if (rc)
 828                 return rc;
 829         rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
 830         if (rc) {
 831                 firmware_unregister(&reipl_subsys);
 832                 return rc;
 833         }
 834         rc = reipl_ccw_init();
 835         if (rc)
 836                 return rc;
 837         rc = reipl_fcp_init();
 838         if (rc)
 839                 return rc;
 840         rc = reipl_set_type(ipl_get_type());
 841         if (rc)
 842                 return rc;
 843         return 0;
 844 }
 845
 846 static int __init dump_ccw_init(void)
 847 {
 848         int rc;
 849
 850         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 851         if (!dump_block_ccw)
 852                 return -ENOMEM;
 853         rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_ccw_attr_group);
 854         if (rc) {
 855                 free_page((unsigned long)dump_block_ccw);
 856                 return rc;
 857         }
 858         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 859         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 860         dump_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
 861         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 862         dump_capabilities |= IPL_TYPE_CCW;
 863         return 0;
 864 }
 865
 866 static int __init dump_fcp_init(void)
 867 {
 868         int rc;
 869
 870         if(!(SCCB_FLAG & 0x2) || !SCCB_VALID)
 871                 return 0; /* LDIPL DUMP is not installed */
 872         if (!diag308_set_works)
 873                 return 0;
 874         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 875         if (!dump_block_fcp)
 876                 return -ENOMEM;
 877         rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_fcp_attr_group);
 878         if (rc) {
 879                 free_page((unsigned long)dump_block_fcp);
 880                 return rc;
 881         }
 882         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 883         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
 884         dump_block_fcp->hdr.blk0_len = sizeof(dump_block_fcp->ipl_info.fcp);
 885         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
 886         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
 887         dump_capabilities |= IPL_TYPE_FCP;
 888         return 0;
 889 }
 890
 891 #define SHUTDOWN_ON_PANIC_PRIO 0
 892
 893 static int shutdown_on_panic_notify(struct notifier_block *self,
 894                                     unsigned long event, void *data)
 895 {
 896         if (on_panic_action == SHUTDOWN_DUMP)
 897                 do_dump();
 898         else if (on_panic_action == SHUTDOWN_REIPL)
 899                 do_reipl();
 900         return NOTIFY_OK;
 901 }
 902
 903 static struct notifier_block shutdown_on_panic_nb = {
 904         .notifier_call = shutdown_on_panic_notify,
 905         .priority = SHUTDOWN_ON_PANIC_PRIO
 906 };
 907
 908 static int __init dump_init(void)
 909 {
 910         int rc;
 911
 912         rc = firmware_register(&dump_subsys);
 913         if (rc)
 914                 return rc;
 915         rc = subsys_create_file(&dump_subsys, &dump_type_attr);
 916         if (rc) {
 917                 firmware_unregister(&dump_subsys);
 918                 return rc;
 919         }
 920         rc = dump_ccw_init();
 921         if (rc)
 922                 return rc;
 923         rc = dump_fcp_init();
 924         if (rc)
 925                 return rc;
 926         dump_set_type(IPL_TYPE_NONE);
 927         return 0;
 928 }
 929
 930 static int __init shutdown_actions_init(void)
 931 {
 932         int rc;
 933
 934         rc = firmware_register(&shutdown_actions_subsys);
 935         if (rc)
 936                 return rc;
 937         rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
 938         if (rc) {
 939                 firmware_unregister(&shutdown_actions_subsys);
 940                 return rc;
 941         }
 942         atomic_notifier_chain_register(&panic_notifier_list,
 943                                        &shutdown_on_panic_nb);
 944         return 0;
 945 }
 946
 947 static int __init s390_ipl_init(void)
 948 {
 949         int rc;
 950
 951         reipl_probe();
 952         rc = ipl_init();
 953         if (rc)
 954                 return rc;
 955         rc = reipl_init();
 956         if (rc)
 957                 return rc;
 958         rc = dump_init();
 959         if (rc)
 960                 return rc;
 961         rc = shutdown_actions_init();
 962         if (rc)
 963                 return rc;
 964         return 0;
 965 }
 966
 967 __initcall(s390_ipl_init);
 968
 969 static LIST_HEAD(rcall);
 970 static DEFINE_MUTEX(rcall_mutex);
 971
 972 void register_reset_call(struct reset_call *reset)
 973 {
 974         mutex_lock(&rcall_mutex);
 975         list_add(&reset->list, &rcall);
 976         mutex_unlock(&rcall_mutex);
 977 }
 978 EXPORT_SYMBOL_GPL(register_reset_call);
 979
 980 void unregister_reset_call(struct reset_call *reset)
 981 {
 982         mutex_lock(&rcall_mutex);
 983         list_del(&reset->list);
 984         mutex_unlock(&rcall_mutex);
 985 }
 986 EXPORT_SYMBOL_GPL(unregister_reset_call);
 987
 988 static void do_reset_calls(void)
 989 {
 990         struct reset_call *reset;
 991
 992         list_for_each_entry(reset, &rcall, list)
 993                 reset->fn();
 994 }
 995
 996 extern void reset_mcck_handler(void);
 997 extern void reset_pgm_handler(void);
 998 extern __u32 dump_prefix_page;
 999
1000 void s390_reset_system(void)
1001 {
1002         struct _lowcore *lc;
1003
1004         lc = (struct _lowcore *)(unsigned long) store_prefix();
1005
1006         /* Stack for interrupt/machine check handler */
1007         lc->panic_stack = S390_lowcore.panic_stack;
1008
1009         /* Save prefix page address for dump case */
1010         dump_prefix_page = (unsigned long) lc;
1011
1012         /* Disable prefixing */
1013         set_prefix(0);
1014
1015         /* Disable lowcore protection */
1016         __ctl_clear_bit(0,28);
1017
1018         /* Set new machine check handler */
1019         S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
1020         S390_lowcore.mcck_new_psw.addr =
1021                 PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler;
1022
1023         /* Set new program check handler */
1024         S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
1025         S390_lowcore.program_new_psw.addr =
1026                 PSW_ADDR_AMODE | (unsigned long) &reset_pgm_handler;
1027
1028         do_reset_calls();
1029 }