![Tyler Baicar](/assets/img/avatar_default.png)
A RAS (Reliability, Availability, Serviceability) controller may be a separate processor running in parallel with OS execution, and may generate error records for consumption by the OS. If the RAS controller produces multiple error records, then they may be overwritten before the OS has consumed them. The Generic Hardware Error Source (GHES) v2 structure introduces the capability for the OS to acknowledge the consumption of the error record generated by the RAS controller. A RAS controller supporting GHESv2 shall wait for the acknowledgment before writing a new error record, thus eliminating the race condition. Add support for parsing of GHESv2 sub-tables as well. Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org> Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
/*
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* APEI Hardware Error Souce 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 "apei-internal.h"
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#define HEST_PFX "HEST: "
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bool 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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};
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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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}
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BUG_ON(len == -1);
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return len;
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};
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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_warning(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_warning(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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EXPORT_SYMBOL_GPL(apei_hest_parse);
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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 (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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(*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 (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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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_warning(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(sizeof(void *) * ghes_count, 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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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 = 1;
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return 0;
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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 = -ENODEV;
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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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goto err;
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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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rc = -EINVAL;
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goto err;
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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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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 = 1;
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}
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