151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/*
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* APEI Boot Error Record Table (BERT) support
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*
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* Copyright 2011 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* Under normal circumstances, when a hardware error occurs, the error
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* handler receives control and processes the error. This gives OSPM a
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* chance to process the error condition, report it, and optionally attempt
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* recovery. In some cases, the system is unable to process an error.
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* For example, system firmware or a management controller may choose to
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* reset the system or the system might experience an uncontrolled crash
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* or reset.The boot error source is used to report unhandled errors that
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* occurred in a previous boot. This mechanism is described in the BERT
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* table.
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*
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* For more information about BERT, please refer to ACPI Specification
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* version 4.0, section 17.3.1
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*
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* This file is licensed under GPLv2.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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#include "apei-internal.h"
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#undef pr_fmt
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#define pr_fmt(fmt) "BERT: " fmt
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static int bert_disable;
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static void __init bert_print_all(struct acpi_bert_region *region,
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unsigned int region_len)
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{
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struct acpi_hest_generic_status *estatus =
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(struct acpi_hest_generic_status *)region;
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int remain = region_len;
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u32 estatus_len;
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if (!estatus->block_status)
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return;
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while (remain > sizeof(struct acpi_bert_region)) {
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if (cper_estatus_check(estatus)) {
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pr_err(FW_BUG "Invalid error record.\n");
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return;
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}
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estatus_len = cper_estatus_len(estatus);
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if (remain < estatus_len) {
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pr_err(FW_BUG "Truncated status block (length: %u).\n",
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estatus_len);
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return;
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}
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pr_info_once("Error records from previous boot:\n");
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cper_estatus_print(KERN_INFO HW_ERR, estatus);
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/*
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* Because the boot error source is "one-time polled" type,
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* clear Block Status of current Generic Error Status Block,
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* once it's printed.
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*/
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estatus->block_status = 0;
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estatus = (void *)estatus + estatus_len;
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/* No more error records. */
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if (!estatus->block_status)
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return;
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remain -= estatus_len;
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}
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}
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static int __init setup_bert_disable(char *str)
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{
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bert_disable = 1;
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return 0;
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}
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__setup("bert_disable", setup_bert_disable);
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static int __init bert_check_table(struct acpi_table_bert *bert_tab)
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{
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if (bert_tab->header.length < sizeof(struct acpi_table_bert) ||
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bert_tab->region_length < sizeof(struct acpi_bert_region))
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return -EINVAL;
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return 0;
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}
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static int __init bert_init(void)
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{
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struct acpi_bert_region *boot_error_region;
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struct acpi_table_bert *bert_tab;
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unsigned int region_len;
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acpi_status status;
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int rc = 0;
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if (acpi_disabled)
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return 0;
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if (bert_disable) {
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pr_info("Boot Error Record Table support is disabled.\n");
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return 0;
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}
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status = acpi_get_table(ACPI_SIG_BERT, 0, (struct acpi_table_header **)&bert_tab);
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if (status == AE_NOT_FOUND)
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return 0;
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if (ACPI_FAILURE(status)) {
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pr_err("get table failed, %s.\n", acpi_format_exception(status));
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return -EINVAL;
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}
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rc = bert_check_table(bert_tab);
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if (rc) {
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pr_err(FW_BUG "table invalid.\n");
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return rc;
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}
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region_len = bert_tab->region_length;
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if (!request_mem_region(bert_tab->address, region_len, "APEI BERT")) {
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pr_err("Can't request iomem region <%016llx-%016llx>.\n",
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(unsigned long long)bert_tab->address,
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(unsigned long long)bert_tab->address + region_len - 1);
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return -EIO;
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}
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boot_error_region = ioremap_cache(bert_tab->address, region_len);
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if (boot_error_region) {
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bert_print_all(boot_error_region, region_len);
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iounmap(boot_error_region);
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} else {
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rc = -ENOMEM;
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}
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release_mem_region(bert_tab->address, region_len);
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return rc;
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}
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late_initcall(bert_init);
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