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796 lines
21 KiB
796 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* File: mca_drv.c |
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* Purpose: Generic MCA handling layer |
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* |
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* Copyright (C) 2004 FUJITSU LIMITED |
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* Copyright (C) 2004 Hidetoshi Seto <[email protected]> |
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* Copyright (C) 2005 Silicon Graphics, Inc |
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* Copyright (C) 2005 Keith Owens <[email protected]> |
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* Copyright (C) 2006 Russ Anderson <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/sched.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/kallsyms.h> |
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#include <linux/memblock.h> |
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#include <linux/acpi.h> |
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#include <linux/timer.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/smp.h> |
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#include <linux/workqueue.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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|
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#include <asm/delay.h> |
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#include <asm/page.h> |
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#include <asm/ptrace.h> |
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#include <asm/sal.h> |
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#include <asm/mca.h> |
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|
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#include <asm/irq.h> |
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#include <asm/hw_irq.h> |
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|
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#include "mca_drv.h" |
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|
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/* max size of SAL error record (default) */ |
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static int sal_rec_max = 10000; |
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|
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/* from mca_drv_asm.S */ |
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extern void *mca_handler_bhhook(void); |
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static DEFINE_SPINLOCK(mca_bh_lock); |
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typedef enum { |
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MCA_IS_LOCAL = 0, |
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MCA_IS_GLOBAL = 1 |
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} mca_type_t; |
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#define MAX_PAGE_ISOLATE 1024 |
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static struct page *page_isolate[MAX_PAGE_ISOLATE]; |
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static int num_page_isolate = 0; |
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typedef enum { |
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ISOLATE_NG, |
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ISOLATE_OK, |
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ISOLATE_NONE |
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} isolate_status_t; |
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typedef enum { |
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MCA_NOT_RECOVERED = 0, |
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MCA_RECOVERED = 1 |
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} recovery_status_t; |
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|
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/* |
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* This pool keeps pointers to the section part of SAL error record |
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*/ |
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static struct { |
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slidx_list_t *buffer; /* section pointer list pool */ |
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int cur_idx; /* Current index of section pointer list pool */ |
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int max_idx; /* Maximum index of section pointer list pool */ |
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} slidx_pool; |
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static int |
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fatal_mca(const char *fmt, ...) |
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{ |
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va_list args; |
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char buf[256]; |
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va_start(args, fmt); |
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vsnprintf(buf, sizeof(buf), fmt, args); |
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va_end(args); |
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ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf); |
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return MCA_NOT_RECOVERED; |
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} |
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static int |
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mca_recovered(const char *fmt, ...) |
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{ |
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va_list args; |
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char buf[256]; |
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va_start(args, fmt); |
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vsnprintf(buf, sizeof(buf), fmt, args); |
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va_end(args); |
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ia64_mca_printk(KERN_INFO "MCA: %s\n", buf); |
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return MCA_RECOVERED; |
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} |
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/** |
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* mca_page_isolate - isolate a poisoned page in order not to use it later |
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* @paddr: poisoned memory location |
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* |
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* Return value: |
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* one of isolate_status_t, ISOLATE_OK/NG/NONE. |
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*/ |
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static isolate_status_t |
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mca_page_isolate(unsigned long paddr) |
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{ |
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int i; |
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struct page *p; |
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/* whether physical address is valid or not */ |
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if (!ia64_phys_addr_valid(paddr)) |
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return ISOLATE_NONE; |
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if (!pfn_valid(paddr >> PAGE_SHIFT)) |
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return ISOLATE_NONE; |
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/* convert physical address to physical page number */ |
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p = pfn_to_page(paddr>>PAGE_SHIFT); |
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/* check whether a page number have been already registered or not */ |
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for (i = 0; i < num_page_isolate; i++) |
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if (page_isolate[i] == p) |
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return ISOLATE_OK; /* already listed */ |
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/* limitation check */ |
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if (num_page_isolate == MAX_PAGE_ISOLATE) |
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return ISOLATE_NG; |
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/* kick pages having attribute 'SLAB' or 'Reserved' */ |
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if (PageSlab(p) || PageReserved(p)) |
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return ISOLATE_NG; |
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/* add attribute 'Reserved' and register the page */ |
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get_page(p); |
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SetPageReserved(p); |
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page_isolate[num_page_isolate++] = p; |
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return ISOLATE_OK; |
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} |
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/** |
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* mca_hanlder_bh - Kill the process which occurred memory read error |
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* @paddr: poisoned address received from MCA Handler |
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*/ |
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void |
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mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr) |
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{ |
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ia64_mlogbuf_dump(); |
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printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, " |
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"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n", |
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raw_smp_processor_id(), current->pid, |
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from_kuid(&init_user_ns, current_uid()), |
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iip, ipsr, paddr, current->comm); |
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spin_lock(&mca_bh_lock); |
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switch (mca_page_isolate(paddr)) { |
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case ISOLATE_OK: |
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printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); |
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break; |
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case ISOLATE_NG: |
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printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); |
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break; |
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default: |
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break; |
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} |
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spin_unlock(&mca_bh_lock); |
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|
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/* This process is about to be killed itself */ |
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do_exit(SIGKILL); |
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} |
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/** |
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* mca_make_peidx - Make index of processor error section |
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* @slpi: pointer to record of processor error section |
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* @peidx: pointer to index of processor error section |
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*/ |
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|
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static void |
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mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) |
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{ |
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/* |
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* calculate the start address of |
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* "struct cpuid_info" and "sal_processor_static_info_t". |
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*/ |
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u64 total_check_num = slpi->valid.num_cache_check |
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+ slpi->valid.num_tlb_check |
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+ slpi->valid.num_bus_check |
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+ slpi->valid.num_reg_file_check |
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+ slpi->valid.num_ms_check; |
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u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num |
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+ sizeof(sal_log_processor_info_t); |
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u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); |
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peidx_head(peidx) = slpi; |
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peidx_mid(peidx) = (struct sal_cpuid_info *) |
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(slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); |
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peidx_bottom(peidx) = (sal_processor_static_info_t *) |
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(slpi->valid.psi_static_struct ? |
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((char*)slpi + head_size + mid_size) : NULL); |
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} |
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/** |
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* mca_make_slidx - Make index of SAL error record |
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* @buffer: pointer to SAL error record |
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* @slidx: pointer to index of SAL error record |
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* |
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* Return value: |
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* 1 if record has platform error / 0 if not |
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*/ |
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#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ |
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{slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ |
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hl->hdr = ptr; \ |
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list_add(&hl->list, &(sect)); \ |
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slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } |
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static int |
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mca_make_slidx(void *buffer, slidx_table_t *slidx) |
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{ |
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int platform_err = 0; |
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int record_len = ((sal_log_record_header_t*)buffer)->len; |
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u32 ercd_pos; |
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int sects; |
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sal_log_section_hdr_t *sp; |
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|
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/* |
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* Initialize index referring current record |
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*/ |
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INIT_LIST_HEAD(&(slidx->proc_err)); |
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INIT_LIST_HEAD(&(slidx->mem_dev_err)); |
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INIT_LIST_HEAD(&(slidx->sel_dev_err)); |
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INIT_LIST_HEAD(&(slidx->pci_bus_err)); |
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INIT_LIST_HEAD(&(slidx->smbios_dev_err)); |
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INIT_LIST_HEAD(&(slidx->pci_comp_err)); |
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INIT_LIST_HEAD(&(slidx->plat_specific_err)); |
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INIT_LIST_HEAD(&(slidx->host_ctlr_err)); |
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INIT_LIST_HEAD(&(slidx->plat_bus_err)); |
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INIT_LIST_HEAD(&(slidx->unsupported)); |
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|
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/* |
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* Extract a Record Header |
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*/ |
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slidx->header = buffer; |
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|
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/* |
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* Extract each section records |
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* (arranged from "int ia64_log_platform_info_print()") |
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*/ |
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for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; |
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ercd_pos < record_len; ercd_pos += sp->len, sects++) { |
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sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); |
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if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { |
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LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); |
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} else if (!efi_guidcmp(sp->guid, |
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SAL_PLAT_BUS_ERR_SECT_GUID)) { |
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platform_err = 1; |
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LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); |
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} else { |
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LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); |
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} |
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} |
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slidx->n_sections = sects; |
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return platform_err; |
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} |
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/** |
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* init_record_index_pools - Initialize pool of lists for SAL record index |
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* |
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* Return value: |
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* 0 on Success / -ENOMEM on Failure |
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*/ |
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static int |
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init_record_index_pools(void) |
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{ |
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int i; |
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int rec_max_size; /* Maximum size of SAL error records */ |
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int sect_min_size; /* Minimum size of SAL error sections */ |
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/* minimum size table of each section */ |
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static int sal_log_sect_min_sizes[] = { |
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sizeof(sal_log_processor_info_t) |
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+ sizeof(sal_processor_static_info_t), |
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sizeof(sal_log_mem_dev_err_info_t), |
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sizeof(sal_log_sel_dev_err_info_t), |
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sizeof(sal_log_pci_bus_err_info_t), |
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sizeof(sal_log_smbios_dev_err_info_t), |
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sizeof(sal_log_pci_comp_err_info_t), |
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sizeof(sal_log_plat_specific_err_info_t), |
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sizeof(sal_log_host_ctlr_err_info_t), |
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sizeof(sal_log_plat_bus_err_info_t), |
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}; |
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/* |
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* MCA handler cannot allocate new memory on flight, |
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* so we preallocate enough memory to handle a SAL record. |
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* |
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* Initialize a handling set of slidx_pool: |
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* 1. Pick up the max size of SAL error records |
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* 2. Pick up the min size of SAL error sections |
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* 3. Allocate the pool as enough to 2 SAL records |
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* (now we can estimate the maxinum of section in a record.) |
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*/ |
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/* - 1 - */ |
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rec_max_size = sal_rec_max; |
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/* - 2 - */ |
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sect_min_size = sal_log_sect_min_sizes[0]; |
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for (i = 1; i < ARRAY_SIZE(sal_log_sect_min_sizes); i++) |
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if (sect_min_size > sal_log_sect_min_sizes[i]) |
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sect_min_size = sal_log_sect_min_sizes[i]; |
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/* - 3 - */ |
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slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; |
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slidx_pool.buffer = |
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kmalloc_array(slidx_pool.max_idx, sizeof(slidx_list_t), |
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GFP_KERNEL); |
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return slidx_pool.buffer ? 0 : -ENOMEM; |
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} |
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|
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/***************************************************************************** |
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* Recovery functions * |
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*****************************************************************************/ |
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|
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/** |
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* is_mca_global - Check whether this MCA is global or not |
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* @peidx: pointer of index of processor error section |
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* @pbci: pointer to pal_bus_check_info_t |
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* @sos: pointer to hand off struct between SAL and OS |
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* |
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* Return value: |
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* MCA_IS_LOCAL / MCA_IS_GLOBAL |
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*/ |
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static mca_type_t |
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is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, |
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struct ia64_sal_os_state *sos) |
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{ |
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pal_processor_state_info_t *psp = |
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(pal_processor_state_info_t*)peidx_psp(peidx); |
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|
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/* |
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* PAL can request a rendezvous, if the MCA has a global scope. |
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* If "rz_always" flag is set, SAL requests MCA rendezvous |
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* in spite of global MCA. |
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* Therefore it is local MCA when rendezvous has not been requested. |
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* Failed to rendezvous, the system must be down. |
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*/ |
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switch (sos->rv_rc) { |
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case -1: /* SAL rendezvous unsuccessful */ |
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return MCA_IS_GLOBAL; |
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case 0: /* SAL rendezvous not required */ |
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return MCA_IS_LOCAL; |
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case 1: /* SAL rendezvous successful int */ |
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case 2: /* SAL rendezvous successful int with init */ |
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default: |
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break; |
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} |
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/* |
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* If One or more Cache/TLB/Reg_File/Uarch_Check is here, |
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* it would be a local MCA. (i.e. processor internal error) |
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*/ |
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if (psp->tc || psp->cc || psp->rc || psp->uc) |
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return MCA_IS_LOCAL; |
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|
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/* |
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* Bus_Check structure with Bus_Check.ib (internal bus error) flag set |
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* would be a global MCA. (e.g. a system bus address parity error) |
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*/ |
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if (!pbci || pbci->ib) |
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return MCA_IS_GLOBAL; |
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|
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/* |
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* Bus_Check structure with Bus_Check.eb (external bus error) flag set |
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* could be either a local MCA or a global MCA. |
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* |
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* Referring Bus_Check.bsi: |
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* 0: Unknown/unclassified |
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* 1: BERR# |
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* 2: BINIT# |
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* 3: Hard Fail |
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* (FIXME: Are these SGI specific or generic bsi values?) |
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*/ |
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if (pbci->eb) |
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switch (pbci->bsi) { |
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case 0: |
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/* e.g. a load from poisoned memory */ |
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return MCA_IS_LOCAL; |
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case 1: |
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case 2: |
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case 3: |
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return MCA_IS_GLOBAL; |
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} |
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return MCA_IS_GLOBAL; |
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} |
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|
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/** |
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* get_target_identifier - Get the valid Cache or Bus check target identifier. |
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* @peidx: pointer of index of processor error section |
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* |
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* Return value: |
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* target address on Success / 0 on Failure |
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*/ |
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static u64 |
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get_target_identifier(peidx_table_t *peidx) |
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{ |
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u64 target_address = 0; |
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sal_log_mod_error_info_t *smei; |
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pal_cache_check_info_t *pcci; |
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int i, level = 9; |
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|
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/* |
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* Look through the cache checks for a valid target identifier |
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* If more than one valid target identifier, return the one |
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* with the lowest cache level. |
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*/ |
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for (i = 0; i < peidx_cache_check_num(peidx); i++) { |
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smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); |
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if (smei->valid.target_identifier && smei->target_identifier) { |
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pcci = (pal_cache_check_info_t *)&(smei->check_info); |
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if (!target_address || (pcci->level < level)) { |
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target_address = smei->target_identifier; |
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level = pcci->level; |
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continue; |
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} |
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} |
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} |
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if (target_address) |
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return target_address; |
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|
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/* |
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* Look at the bus check for a valid target identifier |
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*/ |
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smei = peidx_bus_check(peidx, 0); |
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if (smei && smei->valid.target_identifier) |
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return smei->target_identifier; |
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|
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return 0; |
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} |
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|
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/** |
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* recover_from_read_error - Try to recover the errors which type are "read"s. |
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* @slidx: pointer of index of SAL error record |
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* @peidx: pointer of index of processor error section |
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* @pbci: pointer of pal_bus_check_info |
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* @sos: pointer to hand off struct between SAL and OS |
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* |
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* Return value: |
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* 1 on Success / 0 on Failure |
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*/ |
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|
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static int |
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recover_from_read_error(slidx_table_t *slidx, |
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peidx_table_t *peidx, pal_bus_check_info_t *pbci, |
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struct ia64_sal_os_state *sos) |
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{ |
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u64 target_identifier; |
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struct pal_min_state_area *pmsa; |
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struct ia64_psr *psr1, *psr2; |
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ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; |
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|
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/* Is target address valid? */ |
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target_identifier = get_target_identifier(peidx); |
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if (!target_identifier) |
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return fatal_mca("target address not valid"); |
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|
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/* |
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* cpu read or memory-mapped io read |
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* |
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* offending process affected process OS MCA do |
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* kernel mode kernel mode down system |
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* kernel mode user mode kill the process |
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* user mode kernel mode down system (*) |
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* user mode user mode kill the process |
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* |
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* (*) You could terminate offending user-mode process |
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* if (pbci->pv && pbci->pl != 0) *and* if you sure |
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* the process not have any locks of kernel. |
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*/ |
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|
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/* Is minstate valid? */ |
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if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) |
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return fatal_mca("minstate not valid"); |
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psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); |
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psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); |
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|
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/* |
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* Check the privilege level of interrupted context. |
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* If it is user-mode, then terminate affected process. |
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*/ |
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|
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pmsa = sos->pal_min_state; |
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if (psr1->cpl != 0 || |
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((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { |
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/* |
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* setup for resume to bottom half of MCA, |
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* "mca_handler_bhhook" |
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*/ |
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/* pass to bhhook as argument (gr8, ...) */ |
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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");
|
|
|