271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* APEI Hardware Error Souce Table support
|
|
*
|
|
* HEST describes error sources in detail; communicates operational
|
|
* parameters (i.e. severity levels, masking bits, and threshold
|
|
* values) to Linux as necessary. It also allows the BIOS to report
|
|
* non-standard error sources to Linux (for example, chipset-specific
|
|
* error registers).
|
|
*
|
|
* For more information about HEST, please refer to ACPI Specification
|
|
* version 4.0, section 17.3.2.
|
|
*
|
|
* Copyright 2009 Intel Corp.
|
|
* Author: Huang Ying <ying.huang@intel.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_device.h>
|
|
#include <acpi/apei.h>
|
|
#include <acpi/ghes.h>
|
|
|
|
#include "apei-internal.h"
|
|
|
|
#define HEST_PFX "HEST: "
|
|
|
|
int hest_disable;
|
|
EXPORT_SYMBOL_GPL(hest_disable);
|
|
|
|
/* HEST table parsing */
|
|
|
|
static struct acpi_table_hest *__read_mostly hest_tab;
|
|
|
|
static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
|
|
[ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
|
|
[ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
|
|
[ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
|
|
[ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
|
|
[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
|
|
[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
|
|
[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
|
|
[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
|
|
[ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
|
|
};
|
|
|
|
static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
|
|
{
|
|
u16 hest_type = hest_hdr->type;
|
|
int len;
|
|
|
|
if (hest_type >= ACPI_HEST_TYPE_RESERVED)
|
|
return 0;
|
|
|
|
len = hest_esrc_len_tab[hest_type];
|
|
|
|
if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
|
|
struct acpi_hest_ia_corrected *cmc;
|
|
cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
|
|
len = sizeof(*cmc) + cmc->num_hardware_banks *
|
|
sizeof(struct acpi_hest_ia_error_bank);
|
|
} else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
|
|
struct acpi_hest_ia_machine_check *mc;
|
|
mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
|
|
len = sizeof(*mc) + mc->num_hardware_banks *
|
|
sizeof(struct acpi_hest_ia_error_bank);
|
|
} else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
|
|
struct acpi_hest_ia_deferred_check *mc;
|
|
mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
|
|
len = sizeof(*mc) + mc->num_hardware_banks *
|
|
sizeof(struct acpi_hest_ia_error_bank);
|
|
}
|
|
BUG_ON(len == -1);
|
|
|
|
return len;
|
|
};
|
|
|
|
int apei_hest_parse(apei_hest_func_t func, void *data)
|
|
{
|
|
struct acpi_hest_header *hest_hdr;
|
|
int i, rc, len;
|
|
|
|
if (hest_disable || !hest_tab)
|
|
return -EINVAL;
|
|
|
|
hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
|
|
for (i = 0; i < hest_tab->error_source_count; i++) {
|
|
len = hest_esrc_len(hest_hdr);
|
|
if (!len) {
|
|
pr_warn(FW_WARN HEST_PFX
|
|
"Unknown or unused hardware error source "
|
|
"type: %d for hardware error source: %d.\n",
|
|
hest_hdr->type, hest_hdr->source_id);
|
|
return -EINVAL;
|
|
}
|
|
if ((void *)hest_hdr + len >
|
|
(void *)hest_tab + hest_tab->header.length) {
|
|
pr_warn(FW_BUG HEST_PFX
|
|
"Table contents overflow for hardware error source: %d.\n",
|
|
hest_hdr->source_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = func(hest_hdr, data);
|
|
if (rc)
|
|
return rc;
|
|
|
|
hest_hdr = (void *)hest_hdr + len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_hest_parse);
|
|
|
|
/*
|
|
* Check if firmware advertises firmware first mode. We need FF bit to be set
|
|
* along with a set of MC banks which work in FF mode.
|
|
*/
|
|
static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
|
|
{
|
|
if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
|
|
return 0;
|
|
|
|
if (!acpi_disable_cmcff)
|
|
return !arch_apei_enable_cmcff(hest_hdr, data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ghes_arr {
|
|
struct platform_device **ghes_devs;
|
|
unsigned int count;
|
|
};
|
|
|
|
static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
|
|
{
|
|
int *count = data;
|
|
|
|
if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
|
|
hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
|
|
(*count)++;
|
|
return 0;
|
|
}
|
|
|
|
static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
|
|
{
|
|
struct platform_device *ghes_dev;
|
|
struct ghes_arr *ghes_arr = data;
|
|
int rc, i;
|
|
|
|
if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
|
|
hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
|
|
return 0;
|
|
|
|
if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
|
|
return 0;
|
|
for (i = 0; i < ghes_arr->count; i++) {
|
|
struct acpi_hest_header *hdr;
|
|
ghes_dev = ghes_arr->ghes_devs[i];
|
|
hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
|
|
if (hdr->source_id == hest_hdr->source_id) {
|
|
pr_warn(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
|
|
hdr->source_id);
|
|
return -EIO;
|
|
}
|
|
}
|
|
ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
|
|
if (!ghes_dev)
|
|
return -ENOMEM;
|
|
|
|
rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = platform_device_add(ghes_dev);
|
|
if (rc)
|
|
goto err;
|
|
ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
|
|
|
|
return 0;
|
|
err:
|
|
platform_device_put(ghes_dev);
|
|
return rc;
|
|
}
|
|
|
|
static int __init hest_ghes_dev_register(unsigned int ghes_count)
|
|
{
|
|
int rc, i;
|
|
struct ghes_arr ghes_arr;
|
|
|
|
ghes_arr.count = 0;
|
|
ghes_arr.ghes_devs = kmalloc_array(ghes_count, sizeof(void *),
|
|
GFP_KERNEL);
|
|
if (!ghes_arr.ghes_devs)
|
|
return -ENOMEM;
|
|
|
|
rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = ghes_estatus_pool_init(ghes_count);
|
|
if (rc)
|
|
goto err;
|
|
|
|
out:
|
|
kfree(ghes_arr.ghes_devs);
|
|
return rc;
|
|
err:
|
|
for (i = 0; i < ghes_arr.count; i++)
|
|
platform_device_unregister(ghes_arr.ghes_devs[i]);
|
|
goto out;
|
|
}
|
|
|
|
static int __init setup_hest_disable(char *str)
|
|
{
|
|
hest_disable = HEST_DISABLED;
|
|
return 0;
|
|
}
|
|
|
|
__setup("hest_disable", setup_hest_disable);
|
|
|
|
void __init acpi_hest_init(void)
|
|
{
|
|
acpi_status status;
|
|
int rc;
|
|
unsigned int ghes_count = 0;
|
|
|
|
if (hest_disable) {
|
|
pr_info(HEST_PFX "Table parsing disabled.\n");
|
|
return;
|
|
}
|
|
|
|
status = acpi_get_table(ACPI_SIG_HEST, 0,
|
|
(struct acpi_table_header **)&hest_tab);
|
|
if (status == AE_NOT_FOUND) {
|
|
hest_disable = HEST_NOT_FOUND;
|
|
return;
|
|
} else if (ACPI_FAILURE(status)) {
|
|
const char *msg = acpi_format_exception(status);
|
|
pr_err(HEST_PFX "Failed to get table, %s\n", msg);
|
|
hest_disable = HEST_DISABLED;
|
|
return;
|
|
}
|
|
|
|
rc = apei_hest_parse(hest_parse_cmc, NULL);
|
|
if (rc)
|
|
goto err;
|
|
|
|
if (!ghes_disable) {
|
|
rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
|
|
if (rc)
|
|
goto err;
|
|
|
|
if (ghes_count)
|
|
rc = hest_ghes_dev_register(ghes_count);
|
|
if (rc)
|
|
goto err;
|
|
}
|
|
|
|
pr_info(HEST_PFX "Table parsing has been initialized.\n");
|
|
return;
|
|
err:
|
|
hest_disable = HEST_DISABLED;
|
|
acpi_put_table((struct acpi_table_header *)hest_tab);
|
|
}
|