2 * APEI Hardware Error Souce Table support
4 * HEST describes error sources in detail; communicates operational
5 * parameters (i.e. severity levels, masking bits, and threshold
6 * values) to Linux as necessary. It also allows the BIOS to report
7 * non-standard error sources to Linux (for example, chipset-specific
10 * For more information about HEST, please refer to ACPI Specification
11 * version 4.0, section 17.3.2.
13 * Copyright 2009 Intel Corp.
14 * Author: Huang Ying <ying.huang@intel.com>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License version
18 * 2 as published by the Free Software Foundation;
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/acpi.h>
30 #include <linux/kdebug.h>
31 #include <linux/highmem.h>
33 #include <linux/platform_device.h>
34 #include <acpi/apei.h>
35 #include <acpi/ghes.h>
37 #include "apei-internal.h"
39 #define HEST_PFX "HEST: "
42 EXPORT_SYMBOL_GPL(hest_disable);
44 /* HEST table parsing */
46 static struct acpi_table_hest *__read_mostly hest_tab;
48 static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
49 [ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
50 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
51 [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
52 [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
53 [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
54 [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
55 [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
56 [ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
57 [ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
60 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
62 u16 hest_type = hest_hdr->type;
65 if (hest_type >= ACPI_HEST_TYPE_RESERVED)
68 len = hest_esrc_len_tab[hest_type];
70 if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
71 struct acpi_hest_ia_corrected *cmc;
72 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
73 len = sizeof(*cmc) + cmc->num_hardware_banks *
74 sizeof(struct acpi_hest_ia_error_bank);
75 } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
76 struct acpi_hest_ia_machine_check *mc;
77 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
78 len = sizeof(*mc) + mc->num_hardware_banks *
79 sizeof(struct acpi_hest_ia_error_bank);
80 } else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
81 struct acpi_hest_ia_deferred_check *mc;
82 mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
83 len = sizeof(*mc) + mc->num_hardware_banks *
84 sizeof(struct acpi_hest_ia_error_bank);
91 int apei_hest_parse(apei_hest_func_t func, void *data)
93 struct acpi_hest_header *hest_hdr;
96 if (hest_disable || !hest_tab)
99 hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
100 for (i = 0; i < hest_tab->error_source_count; i++) {
101 len = hest_esrc_len(hest_hdr);
103 pr_warning(FW_WARN HEST_PFX
104 "Unknown or unused hardware error source "
105 "type: %d for hardware error source: %d.\n",
106 hest_hdr->type, hest_hdr->source_id);
109 if ((void *)hest_hdr + len >
110 (void *)hest_tab + hest_tab->header.length) {
111 pr_warning(FW_BUG HEST_PFX
112 "Table contents overflow for hardware error source: %d.\n",
113 hest_hdr->source_id);
117 rc = func(hest_hdr, data);
121 hest_hdr = (void *)hest_hdr + len;
126 EXPORT_SYMBOL_GPL(apei_hest_parse);
129 * Check if firmware advertises firmware first mode. We need FF bit to be set
130 * along with a set of MC banks which work in FF mode.
132 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
134 if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
137 if (!acpi_disable_cmcff)
138 return !arch_apei_enable_cmcff(hest_hdr, data);
144 struct platform_device **ghes_devs;
148 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
152 if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
153 hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
158 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
160 struct platform_device *ghes_dev;
161 struct ghes_arr *ghes_arr = data;
164 if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
165 hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
168 if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
170 for (i = 0; i < ghes_arr->count; i++) {
171 struct acpi_hest_header *hdr;
172 ghes_dev = ghes_arr->ghes_devs[i];
173 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
174 if (hdr->source_id == hest_hdr->source_id) {
175 pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
180 ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
184 rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
188 rc = platform_device_add(ghes_dev);
191 ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
195 platform_device_put(ghes_dev);
199 static int __init hest_ghes_dev_register(unsigned int ghes_count)
202 struct ghes_arr ghes_arr;
205 ghes_arr.ghes_devs = kmalloc_array(ghes_count, sizeof(void *),
207 if (!ghes_arr.ghes_devs)
210 rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
214 rc = ghes_estatus_pool_init(ghes_count);
219 kfree(ghes_arr.ghes_devs);
222 for (i = 0; i < ghes_arr.count; i++)
223 platform_device_unregister(ghes_arr.ghes_devs[i]);
227 static int __init setup_hest_disable(char *str)
229 hest_disable = HEST_DISABLED;
233 __setup("hest_disable", setup_hest_disable);
235 void __init acpi_hest_init(void)
239 unsigned int ghes_count = 0;
242 pr_info(HEST_PFX "Table parsing disabled.\n");
246 status = acpi_get_table(ACPI_SIG_HEST, 0,
247 (struct acpi_table_header **)&hest_tab);
248 if (status == AE_NOT_FOUND) {
249 hest_disable = HEST_NOT_FOUND;
251 } else if (ACPI_FAILURE(status)) {
252 const char *msg = acpi_format_exception(status);
253 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
258 rc = apei_hest_parse(hest_parse_cmc, NULL);
263 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
268 rc = hest_ghes_dev_register(ghes_count);
273 pr_info(HEST_PFX "Table parsing has been initialized.\n");
276 hest_disable = HEST_DISABLED;