arch/ia64/kernel/mca_drv.c

   1 /*
   2  * File:        mca_drv.c
   3  * Purpose:     Generic MCA handling layer
   4  *
   5  * Copyright (C) 2004 FUJITSU LIMITED
   6  * Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)
   7  * Copyright (C) 2005 Silicon Graphics, Inc
   8  * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
   9  */
  10 #include <linux/config.h>
  11 #include <linux/types.h>
  12 #include <linux/init.h>
  13 #include <linux/sched.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/kallsyms.h>
  17 #include <linux/smp_lock.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/acpi.h>
  20 #include <linux/timer.h>
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/smp.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/mm.h>
  26
  27 #include <asm/delay.h>
  28 #include <asm/machvec.h>
  29 #include <asm/page.h>
  30 #include <asm/ptrace.h>
  31 #include <asm/system.h>
  32 #include <asm/sal.h>
  33 #include <asm/mca.h>
  34
  35 #include <asm/irq.h>
  36 #include <asm/hw_irq.h>
  37
  38 #include "mca_drv.h"
  39
  40 /* max size of SAL error record (default) */
  41 static int sal_rec_max = 10000;
  42
  43 /* from mca_drv_asm.S */
  44 extern void *mca_handler_bhhook(void);
  45
  46 static DEFINE_SPINLOCK(mca_bh_lock);
  47
  48 typedef enum {
  49         MCA_IS_LOCAL  = 0,
  50         MCA_IS_GLOBAL = 1
  51 } mca_type_t;
  52
  53 #define MAX_PAGE_ISOLATE 1024
  54
  55 static struct page *page_isolate[MAX_PAGE_ISOLATE];
  56 static int num_page_isolate = 0;
  57
  58 typedef enum {
  59         ISOLATE_NG = 0,
  60         ISOLATE_OK = 1
  61 } isolate_status_t;
  62
  63 /*
  64  *  This pool keeps pointers to the section part of SAL error record
  65  */
  66 static struct {
  67         slidx_list_t *buffer; /* section pointer list pool */
  68         int          cur_idx; /* Current index of section pointer list pool */
  69         int          max_idx; /* Maximum index of section pointer list pool */
  70 } slidx_pool;
  71
  72 /**
  73  * mca_page_isolate - isolate a poisoned page in order not to use it later
  74  * @paddr:      poisoned memory location
  75  *
  76  * Return value:
  77  *      ISOLATE_OK / ISOLATE_NG
  78  */
  79
  80 static isolate_status_t
  81 mca_page_isolate(unsigned long paddr)
  82 {
  83         int i;
  84         struct page *p;
  85
  86         /* whether physical address is valid or not */
  87         if (!ia64_phys_addr_valid(paddr))
  88                 return ISOLATE_NG;
  89
  90         /* convert physical address to physical page number */
  91         p = pfn_to_page(paddr>>PAGE_SHIFT);
  92
  93         /* check whether a page number have been already registered or not */
  94         for (i = 0; i < num_page_isolate; i++)
  95                 if (page_isolate[i] == p)
  96                         return ISOLATE_OK; /* already listed */
  97
  98         /* limitation check */
  99         if (num_page_isolate == MAX_PAGE_ISOLATE)
 100                 return ISOLATE_NG;
 101
 102         /* kick pages having attribute 'SLAB' or 'Reserved' */
 103         if (PageSlab(p) || PageReserved(p))
 104                 return ISOLATE_NG;
 105
 106         /* add attribute 'Reserved' and register the page */
 107         SetPageReserved(p);
 108         page_isolate[num_page_isolate++] = p;
 109
 110         return ISOLATE_OK;
 111 }
 112
 113 /**
 114  * mca_hanlder_bh - Kill the process which occurred memory read error
 115  * @paddr:      poisoned address received from MCA Handler
 116  */
 117
 118 void
 119 mca_handler_bh(unsigned long paddr)
 120 {
 121         printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n",
 122                 current->pid, current->comm);
 123
 124         spin_lock(&mca_bh_lock);
 125         if (mca_page_isolate(paddr) == ISOLATE_OK) {
 126                 printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
 127         } else {
 128                 printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr);
 129         }
 130         spin_unlock(&mca_bh_lock);
 131
 132         /* This process is about to be killed itself */
 133         do_exit(SIGKILL);
 134 }
 135
 136 /**
 137  * mca_make_peidx - Make index of processor error section
 138  * @slpi:       pointer to record of processor error section
 139  * @peidx:      pointer to index of processor error section
 140  */
 141
 142 static void
 143 mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
 144 {
 145         /*
 146          * calculate the start address of
 147          *   "struct cpuid_info" and "sal_processor_static_info_t".
 148          */
 149         u64 total_check_num = slpi->valid.num_cache_check
 150                                 + slpi->valid.num_tlb_check
 151                                 + slpi->valid.num_bus_check
 152                                 + slpi->valid.num_reg_file_check
 153                                 + slpi->valid.num_ms_check;
 154         u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num
 155                         + sizeof(sal_log_processor_info_t);
 156         u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);
 157
 158         peidx_head(peidx)   = slpi;
 159         peidx_mid(peidx)    = (struct sal_cpuid_info *)
 160                 (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
 161         peidx_bottom(peidx) = (sal_processor_static_info_t *)
 162                 (slpi->valid.psi_static_struct ?
 163                         ((char*)slpi + head_size + mid_size) : NULL);
 164 }
 165
 166 /**
 167  * mca_make_slidx -  Make index of SAL error record
 168  * @buffer:     pointer to SAL error record
 169  * @slidx:      pointer to index of SAL error record
 170  *
 171  * Return value:
 172  *      1 if record has platform error / 0 if not
 173  */
 174 #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
 175         {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
 176         hl->hdr = ptr; \
 177         list_add(&hl->list, &(sect)); \
 178         slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }
 179
 180 static int
 181 mca_make_slidx(void *buffer, slidx_table_t *slidx)
 182 {
 183         int platform_err = 0;
 184         int record_len = ((sal_log_record_header_t*)buffer)->len;
 185         u32 ercd_pos;
 186         int sects;
 187         sal_log_section_hdr_t *sp;
 188
 189         /*
 190          * Initialize index referring current record
 191          */
 192         INIT_LIST_HEAD(&(slidx->proc_err));
 193         INIT_LIST_HEAD(&(slidx->mem_dev_err));
 194         INIT_LIST_HEAD(&(slidx->sel_dev_err));
 195         INIT_LIST_HEAD(&(slidx->pci_bus_err));
 196         INIT_LIST_HEAD(&(slidx->smbios_dev_err));
 197         INIT_LIST_HEAD(&(slidx->pci_comp_err));
 198         INIT_LIST_HEAD(&(slidx->plat_specific_err));
 199         INIT_LIST_HEAD(&(slidx->host_ctlr_err));
 200         INIT_LIST_HEAD(&(slidx->plat_bus_err));
 201         INIT_LIST_HEAD(&(slidx->unsupported));
 202
 203         /*
 204          * Extract a Record Header
 205          */
 206         slidx->header = buffer;
 207
 208         /*
 209          * Extract each section records
 210          * (arranged from "int ia64_log_platform_info_print()")
 211          */
 212         for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
 213                 ercd_pos < record_len; ercd_pos += sp->len, sects++) {
 214                 sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
 215                 if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
 216                         LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
 217                 } else if (!efi_guidcmp(sp->guid,
 218                                 SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
 219                         platform_err = 1;
 220                         LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
 221                 } else if (!efi_guidcmp(sp->guid,
 222                                 SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
 223                         platform_err = 1;
 224                         LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
 225                 } else if (!efi_guidcmp(sp->guid,
 226                                 SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
 227                         platform_err = 1;
 228                         LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
 229                 } else if (!efi_guidcmp(sp->guid,
 230                                 SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
 231                         platform_err = 1;
 232                         LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
 233                 } else if (!efi_guidcmp(sp->guid,
 234                                 SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
 235                         platform_err = 1;
 236                         LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
 237                 } else if (!efi_guidcmp(sp->guid,
 238                                 SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
 239                         platform_err = 1;
 240                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
 241                 } else if (!efi_guidcmp(sp->guid,
 242                                 SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
 243                         platform_err = 1;
 244                         LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
 245                 } else if (!efi_guidcmp(sp->guid,
 246                                 SAL_PLAT_BUS_ERR_SECT_GUID)) {
 247                         platform_err = 1;
 248                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
 249                 } else {
 250                         LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
 251                 }
 252         }
 253         slidx->n_sections = sects;
 254
 255         return platform_err;
 256 }
 257
 258 /**
 259  * init_record_index_pools - Initialize pool of lists for SAL record index
 260  *
 261  * Return value:
 262  *      0 on Success / -ENOMEM on Failure
 263  */
 264 static int
 265 init_record_index_pools(void)
 266 {
 267         int i;
 268         int rec_max_size;  /* Maximum size of SAL error records */
 269         int sect_min_size; /* Minimum size of SAL error sections */
 270         /* minimum size table of each section */
 271         static int sal_log_sect_min_sizes[] = {
 272                 sizeof(sal_log_processor_info_t)
 273                 + sizeof(sal_processor_static_info_t),
 274                 sizeof(sal_log_mem_dev_err_info_t),
 275                 sizeof(sal_log_sel_dev_err_info_t),
 276                 sizeof(sal_log_pci_bus_err_info_t),
 277                 sizeof(sal_log_smbios_dev_err_info_t),
 278                 sizeof(sal_log_pci_comp_err_info_t),
 279                 sizeof(sal_log_plat_specific_err_info_t),
 280                 sizeof(sal_log_host_ctlr_err_info_t),
 281                 sizeof(sal_log_plat_bus_err_info_t),
 282         };
 283
 284         /*
 285          * MCA handler cannot allocate new memory on flight,
 286          * so we preallocate enough memory to handle a SAL record.
 287          *
 288          * Initialize a handling set of slidx_pool:
 289          *   1. Pick up the max size of SAL error records
 290          *   2. Pick up the min size of SAL error sections
 291          *   3. Allocate the pool as enough to 2 SAL records
 292          *     (now we can estimate the maxinum of section in a record.)
 293          */
 294
 295         /* - 1 - */
 296         rec_max_size = sal_rec_max;
 297
 298         /* - 2 - */
 299         sect_min_size = sal_log_sect_min_sizes[0];
 300         for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
 301                 if (sect_min_size > sal_log_sect_min_sizes[i])
 302                         sect_min_size = sal_log_sect_min_sizes[i];
 303
 304         /* - 3 - */
 305         slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
 306         slidx_pool.buffer = (slidx_list_t *)
 307                 kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);
 308
 309         return slidx_pool.buffer ? 0 : -ENOMEM;
 310 }
 311
 312
 313 /*****************************************************************************
 314  * Recovery functions                                                        *
 315  *****************************************************************************/
 316
 317 /**
 318  * is_mca_global - Check whether this MCA is global or not
 319  * @peidx:      pointer of index of processor error section
 320  * @pbci:       pointer to pal_bus_check_info_t
 321  * @sos:        pointer to hand off struct between SAL and OS
 322  *
 323  * Return value:
 324  *      MCA_IS_LOCAL / MCA_IS_GLOBAL
 325  */
 326
 327 static mca_type_t
 328 is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 329               struct ia64_sal_os_state *sos)
 330 {
 331         pal_processor_state_info_t *psp =
 332                 (pal_processor_state_info_t*)peidx_psp(peidx);
 333
 334         /*
 335          * PAL can request a rendezvous, if the MCA has a global scope.
 336          * If "rz_always" flag is set, SAL requests MCA rendezvous
 337          * in spite of global MCA.
 338          * Therefore it is local MCA when rendezvous has not been requested.
 339          * Failed to rendezvous, the system must be down.
 340          */
 341         switch (sos->rv_rc) {
 342                 case -1: /* SAL rendezvous unsuccessful */
 343                         return MCA_IS_GLOBAL;
 344                 case  0: /* SAL rendezvous not required */
 345                         return MCA_IS_LOCAL;
 346                 case  1: /* SAL rendezvous successful int */
 347                 case  2: /* SAL rendezvous successful int with init */
 348                 default:
 349                         break;
 350         }
 351
 352         /*
 353          * If One or more Cache/TLB/Reg_File/Uarch_Check is here,
 354          * it would be a local MCA. (i.e. processor internal error)
 355          */
 356         if (psp->tc || psp->cc || psp->rc || psp->uc)
 357                 return MCA_IS_LOCAL;
 358
 359         /*
 360          * Bus_Check structure with Bus_Check.ib (internal bus error) flag set
 361          * would be a global MCA. (e.g. a system bus address parity error)
 362          */
 363         if (!pbci || pbci->ib)
 364                 return MCA_IS_GLOBAL;
 365
 366         /*
 367          * Bus_Check structure with Bus_Check.eb (external bus error) flag set
 368          * could be either a local MCA or a global MCA.
 369          *
 370          * Referring Bus_Check.bsi:
 371          *   0: Unknown/unclassified
 372          *   1: BERR#
 373          *   2: BINIT#
 374          *   3: Hard Fail
 375          * (FIXME: Are these SGI specific or generic bsi values?)
 376          */
 377         if (pbci->eb)
 378                 switch (pbci->bsi) {
 379                         case 0:
 380                                 /* e.g. a load from poisoned memory */
 381                                 return MCA_IS_LOCAL;
 382                         case 1:
 383                         case 2:
 384                         case 3:
 385                                 return MCA_IS_GLOBAL;
 386                 }
 387
 388         return MCA_IS_GLOBAL;
 389 }
 390
 391 /**
 392  * recover_from_read_error - Try to recover the errors which type are "read"s.
 393  * @slidx:      pointer of index of SAL error record
 394  * @peidx:      pointer of index of processor error section
 395  * @pbci:       pointer of pal_bus_check_info
 396  * @sos:        pointer to hand off struct between SAL and OS
 397  *
 398  * Return value:
 399  *      1 on Success / 0 on Failure
 400  */
 401
 402 static int
 403 recover_from_read_error(slidx_table_t *slidx,
 404                         peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 405                         struct ia64_sal_os_state *sos)
 406 {
 407         sal_log_mod_error_info_t *smei;
 408         pal_min_state_area_t *pmsa;
 409         struct ia64_psr *psr1, *psr2;
 410         ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
 411
 412         /* Is target address valid? */
 413         if (!pbci->tv)
 414                 return 0;
 415
 416         /*
 417          * cpu read or memory-mapped io read
 418          *
 419          *    offending process  affected process  OS MCA do
 420          *     kernel mode        kernel mode       down system
 421          *     kernel mode        user   mode       kill the process
 422          *     user   mode        kernel mode       down system (*)
 423          *     user   mode        user   mode       kill the process
 424          *
 425          * (*) You could terminate offending user-mode process
 426          *    if (pbci->pv && pbci->pl != 0) *and* if you sure
 427          *    the process not have any locks of kernel.
 428          */
 429
 430         psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
 431
 432         /*
 433          *  Check the privilege level of interrupted context.
 434          *   If it is user-mode, then terminate affected process.
 435          */
 436         if (psr1->cpl != 0) {
 437                 smei = peidx_bus_check(peidx, 0);
 438                 if (smei->valid.target_identifier) {
 439                         /*
 440                          *  setup for resume to bottom half of MCA,
 441                          * "mca_handler_bhhook"
 442                          */
 443                         pmsa = sos->pal_min_state;
 444                         /* pass to bhhook as 1st argument (gr8) */
 445                         pmsa->pmsa_gr[8-1] = smei->target_identifier;
 446                         /* set interrupted return address (but no use) */
 447                         pmsa->pmsa_br0 = pmsa->pmsa_iip;
 448                         /* change resume address to bottom half */
 449                         pmsa->pmsa_iip = mca_hdlr_bh->fp;
 450                         pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
 451                         /* set cpl with kernel mode */
 452                         psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
 453                         psr2->cpl = 0;
 454                         psr2->ri  = 0;
 455                         psr2->i  = 0;
 456
 457                         return 1;
 458                 }
 459
 460         }
 461
 462         return 0;
 463 }
 464
 465 /**
 466  * recover_from_platform_error - Recover from platform error.
 467  * @slidx:      pointer of index of SAL error record
 468  * @peidx:      pointer of index of processor error section
 469  * @pbci:       pointer of pal_bus_check_info
 470  * @sos:        pointer to hand off struct between SAL and OS
 471  *
 472  * Return value:
 473  *      1 on Success / 0 on Failure
 474  */
 475
 476 static int
 477 recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
 478                             pal_bus_check_info_t *pbci,
 479                             struct ia64_sal_os_state *sos)
 480 {
 481         int status = 0;
 482         pal_processor_state_info_t *psp =
 483                 (pal_processor_state_info_t*)peidx_psp(peidx);
 484
 485         if (psp->bc && pbci->eb && pbci->bsi == 0) {
 486                 switch(pbci->type) {
 487                 case 1: /* partial read */
 488                 case 3: /* full line(cpu) read */
 489                 case 9: /* I/O space read */
 490                         status = recover_from_read_error(slidx, peidx, pbci,
 491                                                          sos);
 492                         break;
 493                 case 0: /* unknown */
 494                 case 2: /* partial write */
 495                 case 4: /* full line write */
 496                 case 5: /* implicit or explicit write-back operation */
 497                 case 6: /* snoop probe */
 498                 case 7: /* incoming or outgoing ptc.g */
 499                 case 8: /* write coalescing transactions */
 500                 case 10: /* I/O space write */
 501                 case 11: /* inter-processor interrupt message(IPI) */
 502                 case 12: /* interrupt acknowledge or
 503                                 external task priority cycle */
 504                 default:
 505                         break;
 506                 }
 507         }
 508
 509         return status;
 510 }
 511
 512 /**
 513  * recover_from_processor_error
 514  * @platform:   whether there are some platform error section or not
 515  * @slidx:      pointer of index of SAL error record
 516  * @peidx:      pointer of index of processor error section
 517  * @pbci:       pointer of pal_bus_check_info
 518  * @sos:        pointer to hand off struct between SAL and OS
 519  *
 520  * Return value:
 521  *      1 on Success / 0 on Failure
 522  */
 523 /*
 524  *  Later we try to recover when below all conditions are satisfied.
 525  *   1. Only one processor error section is exist.
 526  *   2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)
 527  *   3. The entry of BUS_CHECK_INFO is 1.
 528  *   4. "External bus error" flag is set and the others are not set.
 529  */
 530
 531 static int
 532 recover_from_processor_error(int platform, slidx_table_t *slidx,
 533                              peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 534                              struct ia64_sal_os_state *sos)
 535 {
 536         pal_processor_state_info_t *psp =
 537                 (pal_processor_state_info_t*)peidx_psp(peidx);
 538
 539         /*
 540          * We cannot recover errors with other than bus_check.
 541          */
 542         if (psp->cc || psp->rc || psp->uc)
 543                 return 0;
 544
 545         /*
 546          * If there is no bus error, record is weird but we need not to recover.
 547          */
 548         if (psp->bc == 0 || pbci == NULL)
 549                 return 1;
 550
 551         /*
 552          * Sorry, we cannot handle so many.
 553          */
 554         if (peidx_bus_check_num(peidx) > 1)
 555                 return 0;
 556         /*
 557          * Well, here is only one bus error.
 558          */
 559         if (pbci->ib || pbci->cc)
 560                 return 0;
 561         if (pbci->eb && pbci->bsi > 0)
 562                 return 0;
 563         if (psp->ci == 0)
 564                 return 0;
 565
 566         /*
 567          * This is a local MCA and estimated as recoverble external bus error.
 568          * (e.g. a load from poisoned memory)
 569          * This means "there are some platform errors".
 570          */
 571         if (platform)
 572                 return recover_from_platform_error(slidx, peidx, pbci, sos);
 573         /*
 574          * On account of strange SAL error record, we cannot recover.
 575          */
 576         return 0;
 577 }
 578
 579 /**
 580  * mca_try_to_recover - Try to recover from MCA
 581  * @rec:        pointer to a SAL error record
 582  * @sos:        pointer to hand off struct between SAL and OS
 583  *
 584  * Return value:
 585  *      1 on Success / 0 on Failure
 586  */
 587
 588 static int
 589 mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos)
 590 {
 591         int platform_err;
 592         int n_proc_err;
 593         slidx_table_t slidx;
 594         peidx_table_t peidx;
 595         pal_bus_check_info_t pbci;
 596
 597         /* Make index of SAL error record */
 598         platform_err = mca_make_slidx(rec, &slidx);
 599
 600         /* Count processor error sections */
 601         n_proc_err = slidx_count(&slidx, proc_err);
 602
 603          /* Now, OS can recover when there is one processor error section */
 604         if (n_proc_err > 1)
 605                 return 0;
 606         else if (n_proc_err == 0) {
 607                 /* Weird SAL record ... We need not to recover */
 608
 609                 return 1;
 610         }
 611
 612         /* Make index of processor error section */
 613         mca_make_peidx((sal_log_processor_info_t*)
 614                 slidx_first_entry(&slidx.proc_err)->hdr, &peidx);
 615
 616         /* Extract Processor BUS_CHECK[0] */
 617         *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);
 618
 619         /* Check whether MCA is global or not */
 620         if (is_mca_global(&peidx, &pbci, sos))
 621                 return 0;
 622
 623         /* Try to recover a processor error */
 624         return recover_from_processor_error(platform_err, &slidx, &peidx,
 625                                             &pbci, sos);
 626 }
 627
 628 /*
 629  * =============================================================================
 630  */
 631
 632 int __init mca_external_handler_init(void)
 633 {
 634         if (init_record_index_pools())
 635                 return -ENOMEM;
 636
 637         /* register external mca handlers */
 638         if (ia64_reg_MCA_extension(mca_try_to_recover)) {
 639                 printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
 640                 kfree(slidx_pool.buffer);
 641                 return -EFAULT;
 642         }
 643         return 0;
 644 }
 645
 646 void __exit mca_external_handler_exit(void)
 647 {
 648         /* unregister external mca handlers */
 649         ia64_unreg_MCA_extension();
 650         kfree(slidx_pool.buffer);
 651 }
 652
 653 module_init(mca_external_handler_init);
 654 module_exit(mca_external_handler_exit);
 655
 656 module_param(sal_rec_max, int, 0644);
 657 MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");
 658
 659 MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
 660 MODULE_LICENSE("GPL");