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// SPDX-License-Identifier: GPL-2.0-only
/*
* APEI Boot Error Record Table (BERT) support
*
* Copyright 2011 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* Under normal circumstances, when a hardware error occurs, the error
* handler receives control and processes the error. This gives OSPM a
* chance to process the error condition, report it, and optionally attempt
* recovery. In some cases, the system is unable to process an error.
* For example, system firmware or a management controller may choose to
* reset the system or the system might experience an uncontrolled crash
* or reset.The boot error source is used to report unhandled errors that
* occurred in a previous boot. This mechanism is described in the BERT
* table.
*
* For more information about BERT, please refer to ACPI Specification
* version 4.0, section 17.3.1
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include "apei-internal.h"
#undef pr_fmt
#define pr_fmt(fmt) "BERT: " fmt
#define ACPI_BERT_PRINT_MAX_RECORDS 5
#define ACPI_BERT_PRINT_MAX_LEN 1024
static int bert_disable;
/*
* Print "all" the error records in the BERT table, but avoid huge spam to
* the console if the BIOS included oversize records, or too many records.
* Skipping some records here does not lose anything because the full
* data is available to user tools in:
* /sys/firmware/acpi/tables/data/BERT
*/
static void __init bert_print_all(struct acpi_bert_region *region,
unsigned int region_len)
{
struct acpi_hest_generic_status *estatus =
(struct acpi_hest_generic_status *)region;
int remain = region_len;
int printed = 0, skipped = 0;
u32 estatus_len;
while (remain >= sizeof(struct acpi_bert_region)) {
estatus_len = cper_estatus_len(estatus);
if (remain < estatus_len) {
pr_err(FW_BUG "Truncated status block (length: %u).\n",
estatus_len);
break;
}
/* No more error records. */
if (!estatus->block_status)
break;
if (cper_estatus_check(estatus)) {
pr_err(FW_BUG "Invalid error record.\n");
break;
}
if (estatus_len < ACPI_BERT_PRINT_MAX_LEN &&
printed < ACPI_BERT_PRINT_MAX_RECORDS) {
pr_info_once("Error records from previous boot:\n");
cper_estatus_print(KERN_INFO HW_ERR, estatus);
printed++;
} else {
skipped++;
}
/*
* Because the boot error source is "one-time polled" type,
* clear Block Status of current Generic Error Status Block,
* once it's printed.
*/
estatus->block_status = 0;
estatus = (void *)estatus + estatus_len;
remain -= estatus_len;
}
if (skipped)
pr_info(HW_ERR "Skipped %d error records\n", skipped);
}
static int __init setup_bert_disable(char *str)
{
bert_disable = 1;
return 1;
}
__setup("bert_disable", setup_bert_disable);
static int __init bert_check_table(struct acpi_table_bert *bert_tab)
{
if (bert_tab->header.length < sizeof(struct acpi_table_bert) ||
bert_tab->region_length < sizeof(struct acpi_bert_region))
return -EINVAL;
return 0;
}
static int __init bert_init(void)
{
struct apei_resources bert_resources;
struct acpi_bert_region *boot_error_region;
struct acpi_table_bert *bert_tab;
unsigned int region_len;
acpi_status status;
int rc = 0;
if (acpi_disabled)
return 0;
if (bert_disable) {
pr_info("Boot Error Record Table support is disabled.\n");
return 0;
}
status = acpi_get_table(ACPI_SIG_BERT, 0, (struct acpi_table_header **)&bert_tab);
if (status == AE_NOT_FOUND)
return 0;
if (ACPI_FAILURE(status)) {
pr_err("get table failed, %s.\n", acpi_format_exception(status));
return -EINVAL;
}
rc = bert_check_table(bert_tab);
if (rc) {
pr_err(FW_BUG "table invalid.\n");
return rc;
}
region_len = bert_tab->region_length;
apei_resources_init(&bert_resources);
rc = apei_resources_add(&bert_resources, bert_tab->address,
region_len, true);
if (rc)
return rc;
rc = apei_resources_request(&bert_resources, "APEI BERT");
if (rc)
goto out_fini;
boot_error_region = ioremap_cache(bert_tab->address, region_len);
if (boot_error_region) {
bert_print_all(boot_error_region, region_len);
iounmap(boot_error_region);
} else {
rc = -ENOMEM;
}
apei_resources_release(&bert_resources);
out_fini:
apei_resources_fini(&bert_resources);
return rc;
}
late_initcall(bert_init);
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