41139ac3cd
It was reported that on some machines, there is overlap between ACPI NVS area and BERT address range. This appears reasonable because BERT contents need to be non-volatile across reboot. But this will cause resources conflict in current Linux kernel implementation because the ACPI NVS area is marked as busy. The resource conflict is fixed via excluding the ACPI NVS area when requesting IO resources for BERT. When accessing the BERT contents, the whole BERT address range will be ioremapped and accessed. Reported-and-tested-by: Hans Kristian Rosbach <hansr@raskesider.no> Signed-off-by: Ying Huang <ying.huang@intel.com> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
155 lines
3.7 KiB
C
155 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 apei_resources bert_resources;
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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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apei_resources_init(&bert_resources);
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rc = apei_resources_add(&bert_resources, bert_tab->address,
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region_len, true);
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if (rc)
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return rc;
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rc = apei_resources_request(&bert_resources, "APEI BERT");
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if (rc)
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goto out_fini;
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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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apei_resources_release(&bert_resources);
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out_fini:
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apei_resources_fini(&bert_resources);
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return rc;
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}
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late_initcall(bert_init);
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