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>
36 #include "apei-internal.h"
38 #define HEST_PFX "HEST: "
41 EXPORT_SYMBOL_GPL(hest_disable);
43 /* HEST table parsing */
45 static struct acpi_table_hest *__read_mostly hest_tab;
47 static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
48 [ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
49 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
50 [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
51 [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
52 [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
53 [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
54 [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
57 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
59 u16 hest_type = hest_hdr->type;
62 if (hest_type >= ACPI_HEST_TYPE_RESERVED)
65 len = hest_esrc_len_tab[hest_type];
67 if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
68 struct acpi_hest_ia_corrected *cmc;
69 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
70 len = sizeof(*cmc) + cmc->num_hardware_banks *
71 sizeof(struct acpi_hest_ia_error_bank);
72 } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
73 struct acpi_hest_ia_machine_check *mc;
74 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
75 len = sizeof(*mc) + mc->num_hardware_banks *
76 sizeof(struct acpi_hest_ia_error_bank);
83 int apei_hest_parse(apei_hest_func_t func, void *data)
85 struct acpi_hest_header *hest_hdr;
88 if (hest_disable || !hest_tab)
91 hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
92 for (i = 0; i < hest_tab->error_source_count; i++) {
93 len = hest_esrc_len(hest_hdr);
95 pr_warning(FW_WARN HEST_PFX
96 "Unknown or unused hardware error source "
97 "type: %d for hardware error source: %d.\n",
98 hest_hdr->type, hest_hdr->source_id);
101 if ((void *)hest_hdr + len >
102 (void *)hest_tab + hest_tab->header.length) {
103 pr_warning(FW_BUG HEST_PFX
104 "Table contents overflow for hardware error source: %d.\n",
105 hest_hdr->source_id);
109 rc = func(hest_hdr, data);
113 hest_hdr = (void *)hest_hdr + len;
118 EXPORT_SYMBOL_GPL(apei_hest_parse);
121 * Check if firmware advertises firmware first mode. We need FF bit to be set
122 * along with a set of MC banks which work in FF mode.
124 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
126 return arch_apei_enable_cmcff(hest_hdr, data);
130 struct platform_device **ghes_devs;
134 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
138 if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
143 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
145 struct platform_device *ghes_dev;
146 struct ghes_arr *ghes_arr = data;
149 if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
152 if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
154 for (i = 0; i < ghes_arr->count; i++) {
155 struct acpi_hest_header *hdr;
156 ghes_dev = ghes_arr->ghes_devs[i];
157 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
158 if (hdr->source_id == hest_hdr->source_id) {
159 pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
164 ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
168 rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
172 rc = platform_device_add(ghes_dev);
175 ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
179 platform_device_put(ghes_dev);
183 static int __init hest_ghes_dev_register(unsigned int ghes_count)
186 struct ghes_arr ghes_arr;
189 ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
190 if (!ghes_arr.ghes_devs)
193 rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
197 kfree(ghes_arr.ghes_devs);
200 for (i = 0; i < ghes_arr.count; i++)
201 platform_device_unregister(ghes_arr.ghes_devs[i]);
205 static int __init setup_hest_disable(char *str)
211 __setup("hest_disable", setup_hest_disable);
213 void __init acpi_hest_init(void)
217 unsigned int ghes_count = 0;
220 pr_info(HEST_PFX "Table parsing disabled.\n");
224 status = acpi_get_table(ACPI_SIG_HEST, 0,
225 (struct acpi_table_header **)&hest_tab);
226 if (status == AE_NOT_FOUND)
228 else if (ACPI_FAILURE(status)) {
229 const char *msg = acpi_format_exception(status);
230 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
235 if (!acpi_disable_cmcff)
236 apei_hest_parse(hest_parse_cmc, NULL);
239 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
242 rc = hest_ghes_dev_register(ghes_count);
247 pr_info(HEST_PFX "Table parsing has been initialized.\n");