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mca_drv.c

/*
 * File:    mca_drv.c
 * Purpose: Generic MCA handling layer
 *
 * Copyright (C) 2004 FUJITSU LIMITED
 * Copyright (C) 2004 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
 * Copyright (C) 2005 Silicon Graphics, Inc
 * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
 * Copyright (C) 2006 Russ Anderson <rja@sgi.com>
 */
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kallsyms.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/workqueue.h>
#include <linux/mm.h>

#include <asm/delay.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/sal.h>
#include <asm/mca.h>

#include <asm/irq.h>
#include <asm/hw_irq.h>

#include "mca_drv.h"

/* max size of SAL error record (default) */
static int sal_rec_max = 10000;

/* from mca_drv_asm.S */
extern void *mca_handler_bhhook(void);

static DEFINE_SPINLOCK(mca_bh_lock);

typedef enum {
      MCA_IS_LOCAL  = 0,
      MCA_IS_GLOBAL = 1
} mca_type_t;

#define MAX_PAGE_ISOLATE 1024

static struct page *page_isolate[MAX_PAGE_ISOLATE];
static int num_page_isolate = 0;

typedef enum {
      ISOLATE_NG,
      ISOLATE_OK,
      ISOLATE_NONE
} isolate_status_t;

typedef enum {
      MCA_NOT_RECOVERED = 0,
      MCA_RECOVERED       = 1
} recovery_status_t;

/*
 *  This pool keeps pointers to the section part of SAL error record
 */
static struct {
      slidx_list_t *buffer; /* section pointer list pool */
      int        cur_idx; /* Current index of section pointer list pool */
      int        max_idx; /* Maximum index of section pointer list pool */
} slidx_pool;

static int
fatal_mca(const char *fmt, ...)
{
      va_list args;
      char buf[256];

      va_start(args, fmt);
      vsnprintf(buf, sizeof(buf), fmt, args);
      va_end(args);
      ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf);

      return MCA_NOT_RECOVERED;
}

static int
mca_recovered(const char *fmt, ...)
{
      va_list args;
      char buf[256];

      va_start(args, fmt);
      vsnprintf(buf, sizeof(buf), fmt, args);
      va_end(args);
      ia64_mca_printk(KERN_INFO "MCA: %s\n", buf);

      return MCA_RECOVERED;
}

/**
 * mca_page_isolate - isolate a poisoned page in order not to use it later
 * @paddr:  poisoned memory location
 *
 * Return value:
 *    one of isolate_status_t, ISOLATE_OK/NG/NONE.
 */

static isolate_status_t
mca_page_isolate(unsigned long paddr)
{
      int i;
      struct page *p;

      /* whether physical address is valid or not */
      if (!ia64_phys_addr_valid(paddr))
            return ISOLATE_NONE;

      if (!pfn_valid(paddr >> PAGE_SHIFT))
            return ISOLATE_NONE;

      /* convert physical address to physical page number */
      p = pfn_to_page(paddr>>PAGE_SHIFT);

      /* check whether a page number have been already registered or not */
      for (i = 0; i < num_page_isolate; i++)
            if (page_isolate[i] == p)
                  return ISOLATE_OK; /* already listed */

      /* limitation check */
      if (num_page_isolate == MAX_PAGE_ISOLATE)
            return ISOLATE_NG;

      /* kick pages having attribute 'SLAB' or 'Reserved' */
      if (PageSlab(p) || PageReserved(p))
            return ISOLATE_NG;

      /* add attribute 'Reserved' and register the page */
      get_page(p);
      SetPageReserved(p);
      page_isolate[num_page_isolate++] = p;

      return ISOLATE_OK;
}

/**
 * mca_hanlder_bh - Kill the process which occurred memory read error
 * @paddr:  poisoned address received from MCA Handler
 */

void
mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
{
      ia64_mlogbuf_dump();
      printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
            "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
             raw_smp_processor_id(), current->pid, current_uid(),
            iip, ipsr, paddr, current->comm);

      spin_lock(&mca_bh_lock);
      switch (mca_page_isolate(paddr)) {
      case ISOLATE_OK:
            printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
            break;
      case ISOLATE_NG:
            printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr);
            break;
      default:
            break;
      }
      spin_unlock(&mca_bh_lock);

      /* This process is about to be killed itself */
      do_exit(SIGKILL);
}

/**
 * mca_make_peidx - Make index of processor error section
 * @slpi:   pointer to record of processor error section
 * @peidx:  pointer to index of processor error section
 */

static void
mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
{
      /*
       * calculate the start address of
       *   "struct cpuid_info" and "sal_processor_static_info_t".
       */
      u64 total_check_num = slpi->valid.num_cache_check
                        + slpi->valid.num_tlb_check
                        + slpi->valid.num_bus_check
                        + slpi->valid.num_reg_file_check
                        + slpi->valid.num_ms_check;
      u64 head_size =   sizeof(sal_log_mod_error_info_t) * total_check_num
                  + sizeof(sal_log_processor_info_t);
      u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);

      peidx_head(peidx)   = slpi;
      peidx_mid(peidx)    = (struct sal_cpuid_info *)
            (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
      peidx_bottom(peidx) = (sal_processor_static_info_t *)
            (slpi->valid.psi_static_struct ?
                  ((char*)slpi + head_size + mid_size) : NULL);
}

/**
 * mca_make_slidx -  Make index of SAL error record
 * @buffer: pointer to SAL error record
 * @slidx:  pointer to index of SAL error record
 *
 * Return value:
 *    1 if record has platform error / 0 if not
 */
#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
      {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
      hl->hdr = ptr; \
      list_add(&hl->list, &(sect)); \
      slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }

static int
mca_make_slidx(void *buffer, slidx_table_t *slidx)
{
      int platform_err = 0;
      int record_len = ((sal_log_record_header_t*)buffer)->len;
      u32 ercd_pos;
      int sects;
      sal_log_section_hdr_t *sp;

      /*
       * Initialize index referring current record
       */
      INIT_LIST_HEAD(&(slidx->proc_err));
      INIT_LIST_HEAD(&(slidx->mem_dev_err));
      INIT_LIST_HEAD(&(slidx->sel_dev_err));
      INIT_LIST_HEAD(&(slidx->pci_bus_err));
      INIT_LIST_HEAD(&(slidx->smbios_dev_err));
      INIT_LIST_HEAD(&(slidx->pci_comp_err));
      INIT_LIST_HEAD(&(slidx->plat_specific_err));
      INIT_LIST_HEAD(&(slidx->host_ctlr_err));
      INIT_LIST_HEAD(&(slidx->plat_bus_err));
      INIT_LIST_HEAD(&(slidx->unsupported));

      /*
       * Extract a Record Header
       */
      slidx->header = buffer;

      /*
       * Extract each section records
       * (arranged from "int ia64_log_platform_info_print()")
       */
      for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
            ercd_pos < record_len; ercd_pos += sp->len, sects++) {
            sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
            if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
                  LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
            } else if (!efi_guidcmp(sp->guid,
                        SAL_PLAT_BUS_ERR_SECT_GUID)) {
                  platform_err = 1;
                  LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
            } else {
                  LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
            }
      }
      slidx->n_sections = sects;

      return platform_err;
}

/**
 * init_record_index_pools - Initialize pool of lists for SAL record index
 *
 * Return value:
 *    0 on Success / -ENOMEM on Failure
 */
static int
init_record_index_pools(void)
{
      int i;
      int rec_max_size;  /* Maximum size of SAL error records */
      int sect_min_size; /* Minimum size of SAL error sections */
      /* minimum size table of each section */
      static int sal_log_sect_min_sizes[] = {
            sizeof(sal_log_processor_info_t)
            + sizeof(sal_processor_static_info_t),
            sizeof(sal_log_mem_dev_err_info_t),
            sizeof(sal_log_sel_dev_err_info_t),
            sizeof(sal_log_pci_bus_err_info_t),
            sizeof(sal_log_smbios_dev_err_info_t),
            sizeof(sal_log_pci_comp_err_info_t),
            sizeof(sal_log_plat_specific_err_info_t),
            sizeof(sal_log_host_ctlr_err_info_t),
            sizeof(sal_log_plat_bus_err_info_t),
      };

      /*
       * MCA handler cannot allocate new memory on flight,
       * so we preallocate enough memory to handle a SAL record.
       *
       * Initialize a handling set of slidx_pool:
       *   1. Pick up the max size of SAL error records
       *   2. Pick up the min size of SAL error sections
       *   3. Allocate the pool as enough to 2 SAL records
       *     (now we can estimate the maxinum of section in a record.)
       */

      /* - 1 - */
      rec_max_size = sal_rec_max;

      /* - 2 - */
      sect_min_size = sal_log_sect_min_sizes[0];
      for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
            if (sect_min_size > sal_log_sect_min_sizes[i])
                  sect_min_size = sal_log_sect_min_sizes[i];

      /* - 3 - */
      slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
      slidx_pool.buffer = (slidx_list_t *)
            kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);

      return slidx_pool.buffer ? 0 : -ENOMEM;
}


/*****************************************************************************
 * Recovery functions                                                        *
 *****************************************************************************/

/**
 * is_mca_global - Check whether this MCA is global or not
 * @peidx:  pointer of index of processor error section
 * @pbci:   pointer to pal_bus_check_info_t
 * @sos:    pointer to hand off struct between SAL and OS
 *
 * Return value:
 *    MCA_IS_LOCAL / MCA_IS_GLOBAL
 */

static mca_type_t
is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
            struct ia64_sal_os_state *sos)
{
      pal_processor_state_info_t *psp =
            (pal_processor_state_info_t*)peidx_psp(peidx);

      /*
       * PAL can request a rendezvous, if the MCA has a global scope.
       * If "rz_always" flag is set, SAL requests MCA rendezvous
       * in spite of global MCA.
       * Therefore it is local MCA when rendezvous has not been requested.
       * Failed to rendezvous, the system must be down.
       */
      switch (sos->rv_rc) {
            case -1: /* SAL rendezvous unsuccessful */
                  return MCA_IS_GLOBAL;
            case  0: /* SAL rendezvous not required */
                  return MCA_IS_LOCAL;
            case  1: /* SAL rendezvous successful int */
            case  2: /* SAL rendezvous successful int with init */
            default:
                  break;
      }

      /*
       * If One or more Cache/TLB/Reg_File/Uarch_Check is here,
       * it would be a local MCA. (i.e. processor internal error)
       */
      if (psp->tc || psp->cc || psp->rc || psp->uc)
            return MCA_IS_LOCAL;
      
      /*
       * Bus_Check structure with Bus_Check.ib (internal bus error) flag set
       * would be a global MCA. (e.g. a system bus address parity error)
       */
      if (!pbci || pbci->ib)
            return MCA_IS_GLOBAL;

      /*
       * Bus_Check structure with Bus_Check.eb (external bus error) flag set
       * could be either a local MCA or a global MCA.
       *
       * Referring Bus_Check.bsi:
       *   0: Unknown/unclassified
       *   1: BERR#
       *   2: BINIT#
       *   3: Hard Fail
       * (FIXME: Are these SGI specific or generic bsi values?)
       */
      if (pbci->eb)
            switch (pbci->bsi) {
                  case 0:
                        /* e.g. a load from poisoned memory */
                        return MCA_IS_LOCAL;
                  case 1:
                  case 2:
                  case 3:
                        return MCA_IS_GLOBAL;
            }

      return MCA_IS_GLOBAL;
}

/**
 * get_target_identifier - Get the valid Cache or Bus check target identifier.
 * @peidx:  pointer of index of processor error section
 *
 * Return value:
 *    target address on Success / 0 on Failure
 */
static u64
get_target_identifier(peidx_table_t *peidx)
{
      u64 target_address = 0;
      sal_log_mod_error_info_t *smei;
      pal_cache_check_info_t *pcci;
      int i, level = 9;

      /*
       * Look through the cache checks for a valid target identifier
       * If more than one valid target identifier, return the one
       * with the lowest cache level.
       */
      for (i = 0; i < peidx_cache_check_num(peidx); i++) {
            smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i);
            if (smei->valid.target_identifier && smei->target_identifier) {
                  pcci = (pal_cache_check_info_t *)&(smei->check_info);
                  if (!target_address || (pcci->level < level)) {
                        target_address = smei->target_identifier;
                        level = pcci->level;
                        continue;
                  }
            }
      }
      if (target_address)
            return target_address;

      /*
       * Look at the bus check for a valid target identifier
       */
      smei = peidx_bus_check(peidx, 0);
      if (smei && smei->valid.target_identifier)
            return smei->target_identifier;

      return 0;
}

/**
 * recover_from_read_error - Try to recover the errors which type are "read"s.
 * @slidx:  pointer of index of SAL error record
 * @peidx:  pointer of index of processor error section
 * @pbci:   pointer of pal_bus_check_info
 * @sos:    pointer to hand off struct between SAL and OS
 *
 * Return value:
 *    1 on Success / 0 on Failure
 */

static int
recover_from_read_error(slidx_table_t *slidx,
                  peidx_table_t *peidx, pal_bus_check_info_t *pbci,
                  struct ia64_sal_os_state *sos)
{
      u64 target_identifier;
      pal_min_state_area_t *pmsa;
      struct ia64_psr *psr1, *psr2;
      ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;

      /* Is target address valid? */
      target_identifier = get_target_identifier(peidx);
      if (!target_identifier)
            return fatal_mca("target address not valid");

      /*
       * cpu read or memory-mapped io read
       *
       *    offending process  affected process  OS MCA do
       *     kernel mode        kernel mode       down system
       *     kernel mode        user   mode       kill the process
       *     user   mode        kernel mode       down system (*)
       *     user   mode        user   mode       kill the process
       *
       * (*) You could terminate offending user-mode process
       *    if (pbci->pv && pbci->pl != 0) *and* if you sure
       *    the process not have any locks of kernel.
       */

      /* Is minstate valid? */
      if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))
            return fatal_mca("minstate not valid");
      psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
      psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr);

      /*
       *  Check the privilege level of interrupted context.
       *   If it is user-mode, then terminate affected process.
       */

      pmsa = sos->pal_min_state;
      if (psr1->cpl != 0 ||
         ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) {
            /*
             *  setup for resume to bottom half of MCA,
             * "mca_handler_bhhook"
             */
            /* pass to bhhook as argument (gr8, ...) */
            pmsa->pmsa_gr[8-1] = target_identifier;
            pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip;
            pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr;
            /* set interrupted return address (but no use) */
            pmsa->pmsa_br0 = pmsa->pmsa_iip;
            /* change resume address to bottom half */
            pmsa->pmsa_iip = mca_hdlr_bh->fp;
            pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
            /* set cpl with kernel mode */
            psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
            psr2->cpl = 0;
            psr2->ri  = 0;
            psr2->bn  = 1;
            psr2->i  = 0;

            return mca_recovered("user memory corruption. "
                        "kill affected process - recovered.");
      }

      return fatal_mca("kernel context not recovered, iip 0x%lx\n",
                   pmsa->pmsa_iip);
}

/**
 * recover_from_platform_error - Recover from platform error.
 * @slidx:  pointer of index of SAL error record
 * @peidx:  pointer of index of processor error section
 * @pbci:   pointer of pal_bus_check_info
 * @sos:    pointer to hand off struct between SAL and OS
 *
 * Return value:
 *    1 on Success / 0 on Failure
 */

static int
recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
                      pal_bus_check_info_t *pbci,
                      struct ia64_sal_os_state *sos)
{
      int status = 0;
      pal_processor_state_info_t *psp =
            (pal_processor_state_info_t*)peidx_psp(peidx);

      if (psp->bc && pbci->eb && pbci->bsi == 0) {
            switch(pbci->type) {
            case 1: /* partial read */
            case 3: /* full line(cpu) read */
            case 9: /* I/O space read */
                  status = recover_from_read_error(slidx, peidx, pbci,
                                           sos);
                  break;
            case 0: /* unknown */
            case 2: /* partial write */
            case 4: /* full line write */
            case 5: /* implicit or explicit write-back operation */
            case 6: /* snoop probe */
            case 7: /* incoming or outgoing ptc.g */
            case 8: /* write coalescing transactions */
            case 10: /* I/O space write */
            case 11: /* inter-processor interrupt message(IPI) */
            case 12: /* interrupt acknowledge or
                        external task priority cycle */
            default:
                  break;
            }
      } else if (psp->cc && !psp->bc) {   /* Cache error */
            status = recover_from_read_error(slidx, peidx, pbci, sos);
      }

      return status;
}

/*
 * recover_from_tlb_check
 * @peidx:  pointer of index of processor error section
 *
 * Return value:
 *    1 on Success / 0 on Failure
 */
static int
recover_from_tlb_check(peidx_table_t *peidx)
{
      sal_log_mod_error_info_t *smei;
      pal_tlb_check_info_t *ptci;

      smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0);
      ptci = (pal_tlb_check_info_t *)&(smei->check_info);

      /*
       * Look for signature of a duplicate TLB DTC entry, which is
       * a SW bug and always fatal.
       */
      if (ptci->op == PAL_TLB_CHECK_OP_PURGE
          && !(ptci->itr || ptci->dtc || ptci->itc))
            return fatal_mca("Duplicate TLB entry");

      return mca_recovered("TLB check recovered");
}

/**
 * recover_from_processor_error
 * @platform:     whether there are some platform error section or not
 * @slidx:  pointer of index of SAL error record
 * @peidx:  pointer of index of processor error section
 * @pbci:   pointer of pal_bus_check_info
 * @sos:    pointer to hand off struct between SAL and OS
 *
 * Return value:
 *    1 on Success / 0 on Failure
 */

static int
recover_from_processor_error(int platform, slidx_table_t *slidx,
                       peidx_table_t *peidx, pal_bus_check_info_t *pbci,
                       struct ia64_sal_os_state *sos)
{
      pal_processor_state_info_t *psp =
            (pal_processor_state_info_t*)peidx_psp(peidx);

      /*
       * Processor recovery status must key off of the PAL recovery
       * status in the Processor State Parameter.
       */

      /*
       * The machine check is corrected.
       */
      if (psp->cm == 1)
            return mca_recovered("machine check is already corrected.");

      /*
       * The error was not contained.  Software must be reset.
       */
      if (psp->us || psp->ci == 0)
            return fatal_mca("error not contained");

      /*
       * Look for recoverable TLB check
       */
      if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc))
            return recover_from_tlb_check(peidx);

      /*
       * The cache check and bus check bits have four possible states
       *   cc bc
       *    1  1  Memory error, attempt recovery
       *    1  0  Cache error, attempt recovery
       *    0  1  I/O error, attempt recovery
       *    0  0  Other error type, not recovered
       */
      if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL))
            return fatal_mca("No cache or bus check");

      /*
       * Cannot handle more than one bus check.
       */
      if (peidx_bus_check_num(peidx) > 1)
            return fatal_mca("Too many bus checks");

      if (pbci->ib)
            return fatal_mca("Internal Bus error");
      if (pbci->eb && pbci->bsi > 0)
            return fatal_mca("External bus check fatal status");

      /*
       * This is a local MCA and estimated as a recoverable error.
       */
      if (platform)
            return recover_from_platform_error(slidx, peidx, pbci, sos);

      /*
       * On account of strange SAL error record, we cannot recover.
       */
      return fatal_mca("Strange SAL record");
}

/**
 * mca_try_to_recover - Try to recover from MCA
 * @rec:    pointer to a SAL error record
 * @sos:    pointer to hand off struct between SAL and OS
 *
 * Return value:
 *    1 on Success / 0 on Failure
 */

static int
mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos)
{
      int platform_err;
      int n_proc_err;
      slidx_table_t slidx;
      peidx_table_t peidx;
      pal_bus_check_info_t pbci;

      /* Make index of SAL error record */
      platform_err = mca_make_slidx(rec, &slidx);

      /* Count processor error sections */
      n_proc_err = slidx_count(&slidx, proc_err);

       /* Now, OS can recover when there is one processor error section */
      if (n_proc_err > 1)
            return fatal_mca("Too Many Errors");
      else if (n_proc_err == 0)
            /* Weird SAL record ... We can't do anything */
            return fatal_mca("Weird SAL record");

      /* Make index of processor error section */
      mca_make_peidx((sal_log_processor_info_t*)
            slidx_first_entry(&slidx.proc_err)->hdr, &peidx);

      /* Extract Processor BUS_CHECK[0] */
      *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);

      /* Check whether MCA is global or not */
      if (is_mca_global(&peidx, &pbci, sos))
            return fatal_mca("global MCA");
      
      /* Try to recover a processor error */
      return recover_from_processor_error(platform_err, &slidx, &peidx,
                                  &pbci, sos);
}

/*
 * =============================================================================
 */

int __init mca_external_handler_init(void)
{
      if (init_record_index_pools())
            return -ENOMEM;

      /* register external mca handlers */
      if (ia64_reg_MCA_extension(mca_try_to_recover)) {     
            printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
            kfree(slidx_pool.buffer);
            return -EFAULT;
      }
      return 0;
}

void __exit mca_external_handler_exit(void)
{
      /* unregister external mca handlers */
      ia64_unreg_MCA_extension();
      kfree(slidx_pool.buffer);
}

module_init(mca_external_handler_init);
module_exit(mca_external_handler_exit);

module_param(sal_rec_max, int, 0644);
MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");

MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
MODULE_LICENSE("GPL");

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