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  * Copyright (C) 2006 Russ Anderson <rja@sgi.com>
  10  */
  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,
  60         ISOLATE_OK,
  61         ISOLATE_NONE
  62 } isolate_status_t;
  63
  64 typedef enum {
  65         MCA_NOT_RECOVERED = 0,
  66         MCA_RECOVERED     = 1
  67 } recovery_status_t;
  68
  69 /*
  70  *  This pool keeps pointers to the section part of SAL error record
  71  */
  72 static struct {
  73         slidx_list_t *buffer; /* section pointer list pool */
  74         int          cur_idx; /* Current index of section pointer list pool */
  75         int          max_idx; /* Maximum index of section pointer list pool */
  76 } slidx_pool;
  77
  78 static int
  79 fatal_mca(const char *fmt, ...)
  80 {
  81         va_list args;
  82
  83         va_start(args, fmt);
  84         vprintk(fmt, args);
  85         va_end(args);
  86
  87         return MCA_NOT_RECOVERED;
  88 }
  89
  90 /**
  91  * mca_page_isolate - isolate a poisoned page in order not to use it later
  92  * @paddr:      poisoned memory location
  93  *
  94  * Return value:
  95  *      one of isolate_status_t, ISOLATE_OK/NG/NONE.
  96  */
  97
  98 static isolate_status_t
  99 mca_page_isolate(unsigned long paddr)
 100 {
 101         int i;
 102         struct page *p;
 103
 104         /* whether physical address is valid or not */
 105         if (!ia64_phys_addr_valid(paddr))
 106                 return ISOLATE_NONE;
 107
 108         if (!pfn_valid(paddr >> PAGE_SHIFT))
 109                 return ISOLATE_NONE;
 110
 111         /* convert physical address to physical page number */
 112         p = pfn_to_page(paddr>>PAGE_SHIFT);
 113
 114         /* check whether a page number have been already registered or not */
 115         for (i = 0; i < num_page_isolate; i++)
 116                 if (page_isolate[i] == p)
 117                         return ISOLATE_OK; /* already listed */
 118
 119         /* limitation check */
 120         if (num_page_isolate == MAX_PAGE_ISOLATE)
 121                 return ISOLATE_NG;
 122
 123         /* kick pages having attribute 'SLAB' or 'Reserved' */
 124         if (PageSlab(p) || PageReserved(p))
 125                 return ISOLATE_NG;
 126
 127         /* add attribute 'Reserved' and register the page */
 128         get_page(p);
 129         SetPageReserved(p);
 130         page_isolate[num_page_isolate++] = p;
 131
 132         return ISOLATE_OK;
 133 }
 134
 135 /**
 136  * mca_hanlder_bh - Kill the process which occurred memory read error
 137  * @paddr:      poisoned address received from MCA Handler
 138  */
 139
 140 void
 141 mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
 142 {
 143         printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
 144                 "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
 145                 raw_smp_processor_id(), current->pid, current->uid,
 146                 iip, ipsr, paddr, current->comm);
 147
 148         spin_lock(&mca_bh_lock);
 149         switch (mca_page_isolate(paddr)) {
 150         case ISOLATE_OK:
 151                 printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
 152                 break;
 153         case ISOLATE_NG:
 154                 printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr);
 155                 break;
 156         default:
 157                 break;
 158         }
 159         spin_unlock(&mca_bh_lock);
 160
 161         /* This process is about to be killed itself */
 162         do_exit(SIGKILL);
 163 }
 164
 165 /**
 166  * mca_make_peidx - Make index of processor error section
 167  * @slpi:       pointer to record of processor error section
 168  * @peidx:      pointer to index of processor error section
 169  */
 170
 171 static void
 172 mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
 173 {
 174         /*
 175          * calculate the start address of
 176          *   "struct cpuid_info" and "sal_processor_static_info_t".
 177          */
 178         u64 total_check_num = slpi->valid.num_cache_check
 179                                 + slpi->valid.num_tlb_check
 180                                 + slpi->valid.num_bus_check
 181                                 + slpi->valid.num_reg_file_check
 182                                 + slpi->valid.num_ms_check;
 183         u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num
 184                         + sizeof(sal_log_processor_info_t);
 185         u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);
 186
 187         peidx_head(peidx)   = slpi;
 188         peidx_mid(peidx)    = (struct sal_cpuid_info *)
 189                 (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
 190         peidx_bottom(peidx) = (sal_processor_static_info_t *)
 191                 (slpi->valid.psi_static_struct ?
 192                         ((char*)slpi + head_size + mid_size) : NULL);
 193 }
 194
 195 /**
 196  * mca_make_slidx -  Make index of SAL error record
 197  * @buffer:     pointer to SAL error record
 198  * @slidx:      pointer to index of SAL error record
 199  *
 200  * Return value:
 201  *      1 if record has platform error / 0 if not
 202  */
 203 #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
 204         {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
 205         hl->hdr = ptr; \
 206         list_add(&hl->list, &(sect)); \
 207         slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }
 208
 209 static int
 210 mca_make_slidx(void *buffer, slidx_table_t *slidx)
 211 {
 212         int platform_err = 0;
 213         int record_len = ((sal_log_record_header_t*)buffer)->len;
 214         u32 ercd_pos;
 215         int sects;
 216         sal_log_section_hdr_t *sp;
 217
 218         /*
 219          * Initialize index referring current record
 220          */
 221         INIT_LIST_HEAD(&(slidx->proc_err));
 222         INIT_LIST_HEAD(&(slidx->mem_dev_err));
 223         INIT_LIST_HEAD(&(slidx->sel_dev_err));
 224         INIT_LIST_HEAD(&(slidx->pci_bus_err));
 225         INIT_LIST_HEAD(&(slidx->smbios_dev_err));
 226         INIT_LIST_HEAD(&(slidx->pci_comp_err));
 227         INIT_LIST_HEAD(&(slidx->plat_specific_err));
 228         INIT_LIST_HEAD(&(slidx->host_ctlr_err));
 229         INIT_LIST_HEAD(&(slidx->plat_bus_err));
 230         INIT_LIST_HEAD(&(slidx->unsupported));
 231
 232         /*
 233          * Extract a Record Header
 234          */
 235         slidx->header = buffer;
 236
 237         /*
 238          * Extract each section records
 239          * (arranged from "int ia64_log_platform_info_print()")
 240          */
 241         for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
 242                 ercd_pos < record_len; ercd_pos += sp->len, sects++) {
 243                 sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
 244                 if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
 245                         LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
 246                 } else if (!efi_guidcmp(sp->guid,
 247                                 SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
 248                         platform_err = 1;
 249                         LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
 250                 } else if (!efi_guidcmp(sp->guid,
 251                                 SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
 252                         platform_err = 1;
 253                         LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
 254                 } else if (!efi_guidcmp(sp->guid,
 255                                 SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
 256                         platform_err = 1;
 257                         LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
 258                 } else if (!efi_guidcmp(sp->guid,
 259                                 SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
 260                         platform_err = 1;
 261                         LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
 262                 } else if (!efi_guidcmp(sp->guid,
 263                                 SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
 264                         platform_err = 1;
 265                         LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
 266                 } else if (!efi_guidcmp(sp->guid,
 267                                 SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
 268                         platform_err = 1;
 269                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
 270                 } else if (!efi_guidcmp(sp->guid,
 271                                 SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
 272                         platform_err = 1;
 273                         LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
 274                 } else if (!efi_guidcmp(sp->guid,
 275                                 SAL_PLAT_BUS_ERR_SECT_GUID)) {
 276                         platform_err = 1;
 277                         LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
 278                 } else {
 279                         LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
 280                 }
 281         }
 282         slidx->n_sections = sects;
 283
 284         return platform_err;
 285 }
 286
 287 /**
 288  * init_record_index_pools - Initialize pool of lists for SAL record index
 289  *
 290  * Return value:
 291  *      0 on Success / -ENOMEM on Failure
 292  */
 293 static int
 294 init_record_index_pools(void)
 295 {
 296         int i;
 297         int rec_max_size;  /* Maximum size of SAL error records */
 298         int sect_min_size; /* Minimum size of SAL error sections */
 299         /* minimum size table of each section */
 300         static int sal_log_sect_min_sizes[] = {
 301                 sizeof(sal_log_processor_info_t)
 302                 + sizeof(sal_processor_static_info_t),
 303                 sizeof(sal_log_mem_dev_err_info_t),
 304                 sizeof(sal_log_sel_dev_err_info_t),
 305                 sizeof(sal_log_pci_bus_err_info_t),
 306                 sizeof(sal_log_smbios_dev_err_info_t),
 307                 sizeof(sal_log_pci_comp_err_info_t),
 308                 sizeof(sal_log_plat_specific_err_info_t),
 309                 sizeof(sal_log_host_ctlr_err_info_t),
 310                 sizeof(sal_log_plat_bus_err_info_t),
 311         };
 312
 313         /*
 314          * MCA handler cannot allocate new memory on flight,
 315          * so we preallocate enough memory to handle a SAL record.
 316          *
 317          * Initialize a handling set of slidx_pool:
 318          *   1. Pick up the max size of SAL error records
 319          *   2. Pick up the min size of SAL error sections
 320          *   3. Allocate the pool as enough to 2 SAL records
 321          *     (now we can estimate the maxinum of section in a record.)
 322          */
 323
 324         /* - 1 - */
 325         rec_max_size = sal_rec_max;
 326
 327         /* - 2 - */
 328         sect_min_size = sal_log_sect_min_sizes[0];
 329         for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
 330                 if (sect_min_size > sal_log_sect_min_sizes[i])
 331                         sect_min_size = sal_log_sect_min_sizes[i];
 332
 333         /* - 3 - */
 334         slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
 335         slidx_pool.buffer = (slidx_list_t *)
 336                 kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);
 337
 338         return slidx_pool.buffer ? 0 : -ENOMEM;
 339 }
 340
 341
 342 /*****************************************************************************
 343  * Recovery functions                                                        *
 344  *****************************************************************************/
 345
 346 /**
 347  * is_mca_global - Check whether this MCA is global or not
 348  * @peidx:      pointer of index of processor error section
 349  * @pbci:       pointer to pal_bus_check_info_t
 350  * @sos:        pointer to hand off struct between SAL and OS
 351  *
 352  * Return value:
 353  *      MCA_IS_LOCAL / MCA_IS_GLOBAL
 354  */
 355
 356 static mca_type_t
 357 is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 358               struct ia64_sal_os_state *sos)
 359 {
 360         pal_processor_state_info_t *psp =
 361                 (pal_processor_state_info_t*)peidx_psp(peidx);
 362
 363         /*
 364          * PAL can request a rendezvous, if the MCA has a global scope.
 365          * If "rz_always" flag is set, SAL requests MCA rendezvous
 366          * in spite of global MCA.
 367          * Therefore it is local MCA when rendezvous has not been requested.
 368          * Failed to rendezvous, the system must be down.
 369          */
 370         switch (sos->rv_rc) {
 371                 case -1: /* SAL rendezvous unsuccessful */
 372                         return MCA_IS_GLOBAL;
 373                 case  0: /* SAL rendezvous not required */
 374                         return MCA_IS_LOCAL;
 375                 case  1: /* SAL rendezvous successful int */
 376                 case  2: /* SAL rendezvous successful int with init */
 377                 default:
 378                         break;
 379         }
 380
 381         /*
 382          * If One or more Cache/TLB/Reg_File/Uarch_Check is here,
 383          * it would be a local MCA. (i.e. processor internal error)
 384          */
 385         if (psp->tc || psp->cc || psp->rc || psp->uc)
 386                 return MCA_IS_LOCAL;
 387
 388         /*
 389          * Bus_Check structure with Bus_Check.ib (internal bus error) flag set
 390          * would be a global MCA. (e.g. a system bus address parity error)
 391          */
 392         if (!pbci || pbci->ib)
 393                 return MCA_IS_GLOBAL;
 394
 395         /*
 396          * Bus_Check structure with Bus_Check.eb (external bus error) flag set
 397          * could be either a local MCA or a global MCA.
 398          *
 399          * Referring Bus_Check.bsi:
 400          *   0: Unknown/unclassified
 401          *   1: BERR#
 402          *   2: BINIT#
 403          *   3: Hard Fail
 404          * (FIXME: Are these SGI specific or generic bsi values?)
 405          */
 406         if (pbci->eb)
 407                 switch (pbci->bsi) {
 408                         case 0:
 409                                 /* e.g. a load from poisoned memory */
 410                                 return MCA_IS_LOCAL;
 411                         case 1:
 412                         case 2:
 413                         case 3:
 414                                 return MCA_IS_GLOBAL;
 415                 }
 416
 417         return MCA_IS_GLOBAL;
 418 }
 419
 420 /**
 421  * recover_from_read_error - Try to recover the errors which type are "read"s.
 422  * @slidx:      pointer of index of SAL error record
 423  * @peidx:      pointer of index of processor error section
 424  * @pbci:       pointer of pal_bus_check_info
 425  * @sos:        pointer to hand off struct between SAL and OS
 426  *
 427  * Return value:
 428  *      1 on Success / 0 on Failure
 429  */
 430
 431 static int
 432 recover_from_read_error(slidx_table_t *slidx,
 433                         peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 434                         struct ia64_sal_os_state *sos)
 435 {
 436         sal_log_mod_error_info_t *smei;
 437         pal_min_state_area_t *pmsa;
 438         struct ia64_psr *psr1, *psr2;
 439         ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
 440
 441         /* Is target address valid? */
 442         if (!pbci->tv)
 443                 return fatal_mca(KERN_ALERT "MCA: target address not valid\n");
 444
 445         /*
 446          * cpu read or memory-mapped io read
 447          *
 448          *    offending process  affected process  OS MCA do
 449          *     kernel mode        kernel mode       down system
 450          *     kernel mode        user   mode       kill the process
 451          *     user   mode        kernel mode       down system (*)
 452          *     user   mode        user   mode       kill the process
 453          *
 454          * (*) You could terminate offending user-mode process
 455          *    if (pbci->pv && pbci->pl != 0) *and* if you sure
 456          *    the process not have any locks of kernel.
 457          */
 458
 459         /* Is minstate valid? */
 460         if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))
 461                 return fatal_mca(KERN_ALERT "MCA: minstate not valid\n");
 462         psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
 463         psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr);
 464
 465         /*
 466          *  Check the privilege level of interrupted context.
 467          *   If it is user-mode, then terminate affected process.
 468          */
 469
 470         pmsa = sos->pal_min_state;
 471         if (psr1->cpl != 0 ||
 472            ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) {
 473                 smei = peidx_bus_check(peidx, 0);
 474                 if (smei->valid.target_identifier) {
 475                         /*
 476                          *  setup for resume to bottom half of MCA,
 477                          * "mca_handler_bhhook"
 478                          */
 479                         /* pass to bhhook as argument (gr8, ...) */
 480                         pmsa->pmsa_gr[8-1] = smei->target_identifier;
 481                         pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip;
 482                         pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr;
 483                         /* set interrupted return address (but no use) */
 484                         pmsa->pmsa_br0 = pmsa->pmsa_iip;
 485                         /* change resume address to bottom half */
 486                         pmsa->pmsa_iip = mca_hdlr_bh->fp;
 487                         pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
 488                         /* set cpl with kernel mode */
 489                         psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
 490                         psr2->cpl = 0;
 491                         psr2->ri  = 0;
 492                         psr2->bn  = 1;
 493                         psr2->i  = 0;
 494
 495                         return MCA_RECOVERED;
 496                 }
 497
 498         }
 499
 500         return fatal_mca(KERN_ALERT "MCA: kernel context not recovered,"
 501                           " iip 0x%lx\n", pmsa->pmsa_iip);
 502 }
 503
 504 /**
 505  * recover_from_platform_error - Recover from platform error.
 506  * @slidx:      pointer of index of SAL error record
 507  * @peidx:      pointer of index of processor error section
 508  * @pbci:       pointer of pal_bus_check_info
 509  * @sos:        pointer to hand off struct between SAL and OS
 510  *
 511  * Return value:
 512  *      1 on Success / 0 on Failure
 513  */
 514
 515 static int
 516 recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
 517                             pal_bus_check_info_t *pbci,
 518                             struct ia64_sal_os_state *sos)
 519 {
 520         int status = 0;
 521         pal_processor_state_info_t *psp =
 522                 (pal_processor_state_info_t*)peidx_psp(peidx);
 523
 524         if (psp->bc && pbci->eb && pbci->bsi == 0) {
 525                 switch(pbci->type) {
 526                 case 1: /* partial read */
 527                 case 3: /* full line(cpu) read */
 528                 case 9: /* I/O space read */
 529                         status = recover_from_read_error(slidx, peidx, pbci,
 530                                                          sos);
 531                         break;
 532                 case 0: /* unknown */
 533                 case 2: /* partial write */
 534                 case 4: /* full line write */
 535                 case 5: /* implicit or explicit write-back operation */
 536                 case 6: /* snoop probe */
 537                 case 7: /* incoming or outgoing ptc.g */
 538                 case 8: /* write coalescing transactions */
 539                 case 10: /* I/O space write */
 540                 case 11: /* inter-processor interrupt message(IPI) */
 541                 case 12: /* interrupt acknowledge or
 542                                 external task priority cycle */
 543                 default:
 544                         break;
 545                 }
 546         }
 547
 548         return status;
 549 }
 550
 551 /**
 552  * recover_from_processor_error
 553  * @platform:   whether there are some platform error section or not
 554  * @slidx:      pointer of index of SAL error record
 555  * @peidx:      pointer of index of processor error section
 556  * @pbci:       pointer of pal_bus_check_info
 557  * @sos:        pointer to hand off struct between SAL and OS
 558  *
 559  * Return value:
 560  *      1 on Success / 0 on Failure
 561  */
 562 /*
 563  *  Later we try to recover when below all conditions are satisfied.
 564  *   1. Only one processor error section is exist.
 565  *   2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)
 566  *   3. The entry of BUS_CHECK_INFO is 1.
 567  *   4. "External bus error" flag is set and the others are not set.
 568  */
 569
 570 static int
 571 recover_from_processor_error(int platform, slidx_table_t *slidx,
 572                              peidx_table_t *peidx, pal_bus_check_info_t *pbci,
 573                              struct ia64_sal_os_state *sos)
 574 {
 575         pal_processor_state_info_t *psp =
 576                 (pal_processor_state_info_t*)peidx_psp(peidx);
 577
 578         /*
 579          * Processor recovery status must key off of the PAL recovery
 580          * status in the Processor State Parameter.
 581          */
 582
 583         /*
 584          * The machine check is corrected.
 585          */
 586         if (psp->cm == 1)
 587                 return MCA_RECOVERED;
 588
 589         /*
 590          * The error was not contained.  Software must be reset.
 591          */
 592         if (psp->us || psp->ci == 0)
 593                 return fatal_mca(KERN_ALERT "MCA: error not contained\n");
 594
 595         /*
 596          * The cache check and bus check bits have four possible states
 597          *   cc bc
 598          *    0  0      Weird record, not recovered
 599          *    1  0      Cache error, not recovered
 600          *    0  1      I/O error, attempt recovery
 601          *    1  1      Memory error, attempt recovery
 602          */
 603         if (psp->bc == 0 || pbci == NULL)
 604                 return fatal_mca(KERN_ALERT "MCA: No bus check\n");
 605
 606         /*
 607          * Sorry, we cannot handle so many.
 608          */
 609         if (peidx_bus_check_num(peidx) > 1)
 610                 return fatal_mca(KERN_ALERT "MCA: Too many bus checks\n");
 611         /*
 612          * Well, here is only one bus error.
 613          */
 614         if (pbci->ib)
 615                 return fatal_mca(KERN_ALERT "MCA: Internal Bus error\n");
 616         if (pbci->cc)
 617                 return fatal_mca(KERN_ALERT "MCA: Cache-cache error\n");
 618         if (pbci->eb && pbci->bsi > 0)
 619                 return fatal_mca(KERN_ALERT "MCA: External bus check fatal status\n");
 620
 621         /*
 622          * This is a local MCA and estimated as recoverble external bus error.
 623          * (e.g. a load from poisoned memory)
 624          * This means "there are some platform errors".
 625          */
 626         if (platform)
 627                 return recover_from_platform_error(slidx, peidx, pbci, sos);
 628         /*
 629          * On account of strange SAL error record, we cannot recover.
 630          */
 631         return fatal_mca(KERN_ALERT "MCA: Strange SAL record\n");
 632 }
 633
 634 /**
 635  * mca_try_to_recover - Try to recover from MCA
 636  * @rec:        pointer to a SAL error record
 637  * @sos:        pointer to hand off struct between SAL and OS
 638  *
 639  * Return value:
 640  *      1 on Success / 0 on Failure
 641  */
 642
 643 static int
 644 mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos)
 645 {
 646         int platform_err;
 647         int n_proc_err;
 648         slidx_table_t slidx;
 649         peidx_table_t peidx;
 650         pal_bus_check_info_t pbci;
 651
 652         /* Make index of SAL error record */
 653         platform_err = mca_make_slidx(rec, &slidx);
 654
 655         /* Count processor error sections */
 656         n_proc_err = slidx_count(&slidx, proc_err);
 657
 658          /* Now, OS can recover when there is one processor error section */
 659         if (n_proc_err > 1)
 660                 return fatal_mca(KERN_ALERT "MCA: Too Many Errors\n");
 661         else if (n_proc_err == 0)
 662                 /* Weird SAL record ... We need not to recover */
 663                 return fatal_mca(KERN_ALERT "MCA: Weird SAL record\n");
 664
 665         /* Make index of processor error section */
 666         mca_make_peidx((sal_log_processor_info_t*)
 667                 slidx_first_entry(&slidx.proc_err)->hdr, &peidx);
 668
 669         /* Extract Processor BUS_CHECK[0] */
 670         *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);
 671
 672         /* Check whether MCA is global or not */
 673         if (is_mca_global(&peidx, &pbci, sos))
 674                 return fatal_mca(KERN_ALERT "MCA: global MCA\n");
 675
 676         /* Try to recover a processor error */
 677         return recover_from_processor_error(platform_err, &slidx, &peidx,
 678                                             &pbci, sos);
 679 }
 680
 681 /*
 682  * =============================================================================
 683  */
 684
 685 int __init mca_external_handler_init(void)
 686 {
 687         if (init_record_index_pools())
 688                 return -ENOMEM;
 689
 690         /* register external mca handlers */
 691         if (ia64_reg_MCA_extension(mca_try_to_recover)) {
 692                 printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
 693                 kfree(slidx_pool.buffer);
 694                 return -EFAULT;
 695         }
 696         return 0;
 697 }
 698
 699 void __exit mca_external_handler_exit(void)
 700 {
 701         /* unregister external mca handlers */
 702         ia64_unreg_MCA_extension();
 703         kfree(slidx_pool.buffer);
 704 }
 705
 706 module_init(mca_external_handler_init);
 707 module_exit(mca_external_handler_exit);
 708
 709 module_param(sal_rec_max, int, 0644);
 710 MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");
 711
 712 MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
 713 MODULE_LICENSE("GPL");