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