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  */
   8 #include <linux/config.h>
   9 #include <linux/types.h>
  10 #include <linux/init.h>
  11 #include <linux/sched.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irq.h>
  14 #include <linux/kallsyms.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/acpi.h>
  18 #include <linux/timer.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/smp.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/mm.h>
  24
  25 #include <asm/delay.h>
  26 #include <asm/machvec.h>
  27 #include <asm/page.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/system.h>
  30 #include <asm/sal.h>
  31 #include <asm/mca.h>
  32
  33 #include <asm/irq.h>
  34 #include <asm/hw_irq.h>
  35
  36 #include "mca_drv.h"
  37
  38 /* max size of SAL error record (default) */
  39 static int sal_rec_max = 10000;
  40
  41 /* from mca.c */
  42 static ia64_mca_sal_to_os_state_t *sal_to_os_handoff_state;
  43 static ia64_mca_os_to_sal_state_t *os_to_sal_handoff_state;
  44
  45 /* from mca_drv_asm.S */
  46 extern void *mca_handler_bhhook(void);
  47
  48 static DEFINE_SPINLOCK(mca_bh_lock);
  49
  50 typedef enum {
  51         MCA_IS_LOCAL  = 0,
  52         MCA_IS_GLOBAL = 1
  53 } mca_type_t;
  54
  55 #define MAX_PAGE_ISOLATE 1024
  56
  57 static struct page *page_isolate[MAX_PAGE_ISOLATE];
  58 static int num_page_isolate = 0;
  59
  60 typedef enum {
  61         ISOLATE_NG = 0,
  62         ISOLATE_OK = 1
  63 } isolate_status_t;
  64
  65 /*
  66  *  This pool keeps pointers to the section part of SAL error record
  67  */
  68 static struct {
  69         slidx_list_t *buffer; /* section pointer list pool */
  70         int          cur_idx; /* Current index of section pointer list pool */
  71         int          max_idx; /* Maximum index of section pointer list pool */
  72 } slidx_pool;
  73
  74 /**
  75  * mca_page_isolate - isolate a poisoned page in order not to use it later
  76  * @paddr:      poisoned memory location
  77  *
  78  * Return value:
  79  *      ISOLATE_OK / ISOLATE_NG
  80  */
  81
  82 static isolate_status_t
  83 mca_page_isolate(unsigned long paddr)
  84 {
  85         int i;
  86         struct page *p;
  87
  88         /* whether physical address is valid or not */
  89         if ( !ia64_phys_addr_valid(paddr) )
  90                 return ISOLATE_NG;
  91
  92         /* convert physical address to physical page number */
  93         p = pfn_to_page(paddr>>PAGE_SHIFT);
  94
  95         /* check whether a page number have been already registered or not */
  96         for( i = 0; i < num_page_isolate; i++ )
  97                 if( page_isolate[i] == p )
  98                         return ISOLATE_OK; /* already listed */
  99
 100         /* limitation check */
 101         if( num_page_isolate == MAX_PAGE_ISOLATE )
 102                 return ISOLATE_NG;
 103
 104         /* kick pages having attribute 'SLAB' or 'Reserved' */
 105         if( PageSlab(p) || PageReserved(p) )
 106                 return ISOLATE_NG;
 107
 108         /* add attribute 'Reserved' and register the page */
 109         SetPageReserved(p);
 110         page_isolate[num_page_isolate++] = p;
 111
 112         return ISOLATE_OK;
 113 }
 114
 115 /**
 116  * mca_hanlder_bh - Kill the process which occurred memory read error
 117  * @paddr:      poisoned address received from MCA Handler
 118  */
 119
 120 void
 121 mca_handler_bh(unsigned long paddr)
 122 {
 123         printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n",
 124                 current->pid, current->comm);
 125
 126         spin_lock(&mca_bh_lock);
 127         if (mca_page_isolate(paddr) == ISOLATE_OK) {
 128                 printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
 129         } else {
 130                 printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr);
 131         }
 132         spin_unlock(&mca_bh_lock);
 133
 134         /* This process is about to be killed itself */
 135         force_sig(SIGKILL, current);
 136         schedule();
 137 }
 138
 139 /**
 140  * mca_make_peidx - Make index of processor error section
 141  * @slpi:       pointer to record of processor error section
 142  * @peidx:      pointer to index of processor error section
 143  */
 144
 145 static void
 146 mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
 147 {
 148         /*
 149          * calculate the start address of
 150          *   "struct cpuid_info" and "sal_processor_static_info_t".
 151          */
 152         u64 total_check_num = slpi->valid.num_cache_check
 153                                 + slpi->valid.num_tlb_check
 154                                 + slpi->valid.num_bus_check
 155                                 + slpi->valid.num_reg_file_check
 156                                 + slpi->valid.num_ms_check;
 157         u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num
 158                         + sizeof(sal_log_processor_info_t);
 159         u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);
 160
 161         peidx_head(peidx)   = slpi;
 162         peidx_mid(peidx)    = (struct sal_cpuid_info *)
 163                 (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
 164         peidx_bottom(peidx) = (sal_processor_static_info_t *)
 165                 (slpi->valid.psi_static_struct ?
 166                         ((char*)slpi + head_size + mid_size) : NULL);
 167 }
 168
 169 /**
 170  * mca_make_slidx -  Make index of SAL error record
 171  * @buffer:     pointer to SAL error record
 172  * @slidx:      pointer to index of SAL error record
 173  *
 174  * Return value:
 175  *      1 if record has platform error / 0 if not
 176  */
 177 #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
 178         { slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
 179           hl->hdr = ptr; \
 180           list_add(&hl->list, &(sect)); \
 181           slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }
 182
 183 static int
 184 mca_make_slidx(void *buffer, slidx_table_t *slidx)
 185 {
 186         int platform_err = 0;
 187         int record_len = ((sal_log_record_header_t*)buffer)->len;
 188         u32 ercd_pos;
 189         int sects;
 190         sal_log_section_hdr_t *sp;
 191
 192         /*
 193          * Initialize index referring current record
 194          */
 195         INIT_LIST_HEAD(&(slidx->proc_err));
 196         INIT_LIST_HEAD(&(slidx->mem_dev_err));
 197         INIT_LIST_HEAD(&(slidx->sel_dev_err));
 198         INIT_LIST_HEAD(&(slidx->pci_bus_err));
 199         INIT_LIST_HEAD(&(slidx->smbios_dev_err));
 200         INIT_LIST_HEAD(&(slidx->pci_comp_err));
 201         INIT_LIST_HEAD(&(slidx->plat_specific_err));
 202         INIT_LIST_HEAD(&(slidx->host_ctlr_err));
 203         INIT_LIST_HEAD(&(slidx->plat_bus_err));
 204         INIT_LIST_HEAD(&(slidx->unsupported));
 205
 206         /*
 207          * Extract a Record Header
 208          */
 209         slidx->header = buffer;
 210
 211         /*
 212          * Extract each section records
 213          * (arranged from "int ia64_log_platform_info_print()")
 214          */
 215         for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
 216                 ercd_pos < record_len; ercd_pos += sp->len, sects++) {
 217                 sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
 218                 if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
 219                         LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
 220                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
 221                         platform_err = 1;
 222                         LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
 223                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
 224                         platform_err = 1;
 225                         LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
 226                 } else if (!efi_guidcmp(sp->guid, 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, SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
 230                         platform_err = 1;
 231                         LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
 232                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
 233                         platform_err = 1;
 234                         LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
 235                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
 236                         platform_err = 1;
 237                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
 238                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
 239                         platform_err = 1;
 240                         LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
 241                 } else if (!efi_guidcmp(sp->guid, SAL_PLAT_BUS_ERR_SECT_GUID)) {
 242                         platform_err = 1;
 243                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
 244                 } else {
 245                         LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
 246                 }
 247         }
 248         slidx->n_sections = sects;
 249
 250         return platform_err;
 251 }
 252
 253 /**
 254  * init_record_index_pools - Initialize pool of lists for SAL record index
 255  *
 256  * Return value:
 257  *      0 on Success / -ENOMEM on Failure
 258  */
 259 static int
 260 init_record_index_pools(void)
 261 {
 262         int i;
 263         int rec_max_size;  /* Maximum size of SAL error records */
 264         int sect_min_size; /* Minimum size of SAL error sections */
 265         /* minimum size table of each section */
 266         static int sal_log_sect_min_sizes[] = {
 267                 sizeof(sal_log_processor_info_t) + sizeof(sal_processor_static_info_t),
 268                 sizeof(sal_log_mem_dev_err_info_t),
 269                 sizeof(sal_log_sel_dev_err_info_t),
 270                 sizeof(sal_log_pci_bus_err_info_t),
 271                 sizeof(sal_log_smbios_dev_err_info_t),
 272                 sizeof(sal_log_pci_comp_err_info_t),
 273                 sizeof(sal_log_plat_specific_err_info_t),
 274                 sizeof(sal_log_host_ctlr_err_info_t),
 275                 sizeof(sal_log_plat_bus_err_info_t),
 276         };
 277
 278         /*
 279          * MCA handler cannot allocate new memory on flight,
 280          * so we preallocate enough memory to handle a SAL record.
 281          *
 282          * Initialize a handling set of slidx_pool:
 283          *   1. Pick up the max size of SAL error records
 284          *   2. Pick up the min size of SAL error sections
 285          *   3. Allocate the pool as enough to 2 SAL records
 286          *     (now we can estimate the maxinum of section in a record.)
 287          */
 288
 289         /* - 1 - */
 290         rec_max_size = sal_rec_max;
 291
 292         /* - 2 - */
 293         sect_min_size = sal_log_sect_min_sizes[0];
 294         for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
 295                 if (sect_min_size > sal_log_sect_min_sizes[i])
 296                         sect_min_size = sal_log_sect_min_sizes[i];
 297
 298         /* - 3 - */
 299         slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
 300         slidx_pool.buffer = (slidx_list_t *) kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);
 301
 302         return slidx_pool.buffer ? 0 : -ENOMEM;
 303 }
 304
 305
 306 /*****************************************************************************
 307  * Recovery functions                                                        *
 308  *****************************************************************************/
 309
 310 /**
 311  * is_mca_global - Check whether this MCA is global or not
 312  * @peidx:      pointer of index of processor error section
 313  * @pbci:       pointer to pal_bus_check_info_t
 314  *
 315  * Return value:
 316  *      MCA_IS_LOCAL / MCA_IS_GLOBAL
 317  */
 318
 319 static mca_type_t
 320 is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci)
 321 {
 322         pal_processor_state_info_t *psp = (pal_processor_state_info_t*)peidx_psp(peidx);
 323
 324         /*
 325          * PAL can request a rendezvous, if the MCA has a global scope.
 326          * If "rz_always" flag is set, SAL requests MCA rendezvous
 327          * in spite of global MCA.
 328          * Therefore it is local MCA when rendezvous has not been requested.
 329          * Failed to rendezvous, the system must be down.
 330          */
 331         switch (sal_to_os_handoff_state->imsto_rendez_state) {
 332                 case -1: /* SAL rendezvous unsuccessful */
 333                         return MCA_IS_GLOBAL;
 334                 case  0: /* SAL rendezvous not required */
 335                         return MCA_IS_LOCAL;
 336                 case  1: /* SAL rendezvous successful int */
 337                 case  2: /* SAL rendezvous successful int with init */
 338                 default:
 339                         break;
 340         }
 341
 342         /*
 343          * If One or more Cache/TLB/Reg_File/Uarch_Check is here,
 344          * it would be a local MCA. (i.e. processor internal error)
 345          */
 346         if (psp->tc || psp->cc || psp->rc || psp->uc)
 347                 return MCA_IS_LOCAL;
 348
 349         /*
 350          * Bus_Check structure with Bus_Check.ib (internal bus error) flag set
 351          * would be a global MCA. (e.g. a system bus address parity error)
 352          */
 353         if (!pbci || pbci->ib)
 354                 return MCA_IS_GLOBAL;
 355
 356         /*
 357          * Bus_Check structure with Bus_Check.eb (external bus error) flag set
 358          * could be either a local MCA or a global MCA.
 359          *
 360          * Referring Bus_Check.bsi:
 361          *   0: Unknown/unclassified
 362          *   1: BERR#
 363          *   2: BINIT#
 364          *   3: Hard Fail
 365          * (FIXME: Are these SGI specific or generic bsi values?)
 366          */
 367         if (pbci->eb)
 368                 switch (pbci->bsi) {
 369                         case 0:
 370                                 /* e.g. a load from poisoned memory */
 371                                 return MCA_IS_LOCAL;
 372                         case 1:
 373                         case 2:
 374                         case 3:
 375                                 return MCA_IS_GLOBAL;
 376                 }
 377
 378         return MCA_IS_GLOBAL;
 379 }
 380
 381 /**
 382  * recover_from_read_error - Try to recover the errors which type are "read"s.
 383  * @slidx:      pointer of index of SAL error record
 384  * @peidx:      pointer of index of processor error section
 385  * @pbci:       pointer of pal_bus_check_info
 386  *
 387  * Return value:
 388  *      1 on Success / 0 on Failure
 389  */
 390
 391 static int
 392 recover_from_read_error(slidx_table_t *slidx, peidx_table_t *peidx, pal_bus_check_info_t *pbci)
 393 {
 394         sal_log_mod_error_info_t *smei;
 395         pal_min_state_area_t *pmsa;
 396         struct ia64_psr *psr1, *psr2;
 397         ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
 398
 399         /* Is target address valid? */
 400         if (!pbci->tv)
 401                 return 0;
 402
 403         /*
 404          * cpu read or memory-mapped io read
 405          *
 406          *    offending process  affected process  OS MCA do
 407          *     kernel mode        kernel mode       down system
 408          *     kernel mode        user   mode       kill the process
 409          *     user   mode        kernel mode       down system (*)
 410          *     user   mode        user   mode       kill the process
 411          *
 412          * (*) You could terminate offending user-mode process
 413          *    if (pbci->pv && pbci->pl != 0) *and* if you sure
 414          *    the process not have any locks of kernel.
 415          */
 416
 417         psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
 418
 419         /*
 420          *  Check the privilege level of interrupted context.
 421          *   If it is user-mode, then terminate affected process.
 422          */
 423         if (psr1->cpl != 0) {
 424                 smei = peidx_bus_check(peidx, 0);
 425                 if (smei->valid.target_identifier) {
 426                         /*
 427                          *  setup for resume to bottom half of MCA,
 428                          * "mca_handler_bhhook"
 429                          */
 430                         pmsa = (pal_min_state_area_t *)(sal_to_os_handoff_state->pal_min_state | (6ul<<61));
 431                         /* pass to bhhook as 1st argument (gr8) */
 432                         pmsa->pmsa_gr[8-1] = smei->target_identifier;
 433                         /* set interrupted return address (but no use) */
 434                         pmsa->pmsa_br0 = pmsa->pmsa_iip;
 435                         /* change resume address to bottom half */
 436                         pmsa->pmsa_iip = mca_hdlr_bh->fp;
 437                         pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
 438                         /* set cpl with kernel mode */
 439                         psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
 440                         psr2->cpl = 0;
 441                         psr2->ri  = 0;
 442
 443                         return 1;
 444                 }
 445
 446         }
 447
 448         return 0;
 449 }
 450
 451 /**
 452  * recover_from_platform_error - Recover from platform error.
 453  * @slidx:      pointer of index of SAL error record
 454  * @peidx:      pointer of index of processor error section
 455  * @pbci:       pointer of pal_bus_check_info
 456  *
 457  * Return value:
 458  *      1 on Success / 0 on Failure
 459  */
 460
 461 static int
 462 recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, pal_bus_check_info_t *pbci)
 463 {
 464         int status = 0;
 465         pal_processor_state_info_t *psp = (pal_processor_state_info_t*)peidx_psp(peidx);
 466
 467         if (psp->bc && pbci->eb && pbci->bsi == 0) {
 468                 switch(pbci->type) {
 469                 case 1: /* partial read */
 470                 case 3: /* full line(cpu) read */
 471                 case 9: /* I/O space read */
 472                         status = recover_from_read_error(slidx, peidx, pbci);
 473                         break;
 474                 case 0: /* unknown */
 475                 case 2: /* partial write */
 476                 case 4: /* full line write */
 477                 case 5: /* implicit or explicit write-back operation */
 478                 case 6: /* snoop probe */
 479                 case 7: /* incoming or outgoing ptc.g */
 480                 case 8: /* write coalescing transactions */
 481                 case 10: /* I/O space write */
 482                 case 11: /* inter-processor interrupt message(IPI) */
 483                 case 12: /* interrupt acknowledge or external task priority cycle */
 484                 default:
 485                         break;
 486                 }
 487         }
 488
 489         return status;
 490 }
 491
 492 /**
 493  * recover_from_processor_error
 494  * @platform:   whether there are some platform error section or not
 495  * @slidx:      pointer of index of SAL error record
 496  * @peidx:      pointer of index of processor error section
 497  * @pbci:       pointer of pal_bus_check_info
 498  *
 499  * Return value:
 500  *      1 on Success / 0 on Failure
 501  */
 502 /*
 503  *  Later we try to recover when below all conditions are satisfied.
 504  *   1. Only one processor error section is exist.
 505  *   2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)
 506  *   3. The entry of BUS_CHECK_INFO is 1.
 507  *   4. "External bus error" flag is set and the others are not set.
 508  */
 509
 510 static int
 511 recover_from_processor_error(int platform, slidx_table_t *slidx, peidx_table_t *peidx, pal_bus_check_info_t *pbci)
 512 {
 513         pal_processor_state_info_t *psp = (pal_processor_state_info_t*)peidx_psp(peidx);
 514
 515         /*
 516          * We cannot recover errors with other than bus_check.
 517          */
 518         if (psp->cc || psp->rc || psp->uc)
 519                 return 0;
 520
 521         /*
 522          * If there is no bus error, record is weird but we need not to recover.
 523          */
 524         if (psp->bc == 0 || pbci == NULL)
 525                 return 1;
 526
 527         /*
 528          * Sorry, we cannot handle so many.
 529          */
 530         if (peidx_bus_check_num(peidx) > 1)
 531                 return 0;
 532         /*
 533          * Well, here is only one bus error.
 534          */
 535         if (pbci->ib || pbci->cc)
 536                 return 0;
 537         if (pbci->eb && pbci->bsi > 0)
 538                 return 0;
 539         if (psp->ci == 0)
 540                 return 0;
 541
 542         /*
 543          * This is a local MCA and estimated as recoverble external bus error.
 544          * (e.g. a load from poisoned memory)
 545          * This means "there are some platform errors".
 546          */
 547         if (platform)
 548                 return recover_from_platform_error(slidx, peidx, pbci);
 549         /*
 550          * On account of strange SAL error record, we cannot recover.
 551          */
 552         return 0;
 553 }
 554
 555 /**
 556  * mca_try_to_recover - Try to recover from MCA
 557  * @rec:        pointer to a SAL error record
 558  *
 559  * Return value:
 560  *      1 on Success / 0 on Failure
 561  */
 562
 563 static int
 564 mca_try_to_recover(void *rec,
 565         ia64_mca_sal_to_os_state_t *sal_to_os_state,
 566         ia64_mca_os_to_sal_state_t *os_to_sal_state)
 567 {
 568         int platform_err;
 569         int n_proc_err;
 570         slidx_table_t slidx;
 571         peidx_table_t peidx;
 572         pal_bus_check_info_t pbci;
 573
 574         /* handoff state from/to mca.c */
 575         sal_to_os_handoff_state = sal_to_os_state;
 576         os_to_sal_handoff_state = os_to_sal_state;
 577
 578         /* Make index of SAL error record */
 579         platform_err = mca_make_slidx(rec, &slidx);
 580
 581         /* Count processor error sections */
 582         n_proc_err = slidx_count(&slidx, proc_err);
 583
 584          /* Now, OS can recover when there is one processor error section */
 585         if (n_proc_err > 1)
 586                 return 0;
 587         else if (n_proc_err == 0) {
 588                 /* Weird SAL record ... We need not to recover */
 589
 590                 return 1;
 591         }
 592
 593         /* Make index of processor error section */
 594         mca_make_peidx((sal_log_processor_info_t*)slidx_first_entry(&slidx.proc_err)->hdr, &peidx);
 595
 596         /* Extract Processor BUS_CHECK[0] */
 597         *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);
 598
 599         /* Check whether MCA is global or not */
 600         if (is_mca_global(&peidx, &pbci))
 601                 return 0;
 602
 603         /* Try to recover a processor error */
 604         return recover_from_processor_error(platform_err, &slidx, &peidx, &pbci);
 605 }
 606
 607 /*
 608  * =============================================================================
 609  */
 610
 611 int __init mca_external_handler_init(void)
 612 {
 613         if (init_record_index_pools())
 614                 return -ENOMEM;
 615
 616         /* register external mca handlers */
 617         if (ia64_reg_MCA_extension(mca_try_to_recover)){
 618                 printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
 619                 kfree(slidx_pool.buffer);
 620                 return -EFAULT;
 621         }
 622         return 0;
 623 }
 624
 625 void __exit mca_external_handler_exit(void)
 626 {
 627         /* unregister external mca handlers */
 628         ia64_unreg_MCA_extension();
 629         kfree(slidx_pool.buffer);
 630 }
 631
 632 module_init(mca_external_handler_init);
 633 module_exit(mca_external_handler_exit);
 634
 635 module_param(sal_rec_max, int, 0644);
 636 MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");
 637
 638 MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
 639 MODULE_LICENSE("GPL");