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9dc96664 HY |
1 | /* |
2 | * APEI Hardware Error Souce Table support | |
3 | * | |
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 | |
8 | * error registers). | |
9 | * | |
10 | * For more information about HEST, please refer to ACPI Specification | |
11 | * version 4.0, section 17.3.2. | |
12 | * | |
13 | * Copyright 2009 Intel Corp. | |
14 | * Author: Huang Ying <ying.huang@intel.com> | |
15 | * | |
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; | |
19 | * | |
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. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | */ | |
29 | ||
30 | #include <linux/kernel.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/acpi.h> | |
34 | #include <linux/kdebug.h> | |
35 | #include <linux/highmem.h> | |
36 | #include <linux/io.h> | |
7ad6e943 | 37 | #include <linux/platform_device.h> |
9dc96664 HY |
38 | #include <acpi/apei.h> |
39 | ||
40 | #include "apei-internal.h" | |
41 | ||
42 | #define HEST_PFX "HEST: " | |
43 | ||
44 | int hest_disable; | |
45 | EXPORT_SYMBOL_GPL(hest_disable); | |
46 | ||
47 | /* HEST table parsing */ | |
48 | ||
49 | static struct acpi_table_hest *hest_tab; | |
50 | ||
9dc96664 HY |
51 | static int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = { |
52 | [ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */ | |
53 | [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1, | |
54 | [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi), | |
55 | [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root), | |
56 | [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer), | |
57 | [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge), | |
58 | [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic), | |
59 | }; | |
60 | ||
61 | static int hest_esrc_len(struct acpi_hest_header *hest_hdr) | |
62 | { | |
63 | u16 hest_type = hest_hdr->type; | |
64 | int len; | |
65 | ||
66 | if (hest_type >= ACPI_HEST_TYPE_RESERVED) | |
67 | return 0; | |
68 | ||
69 | len = hest_esrc_len_tab[hest_type]; | |
70 | ||
71 | if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) { | |
72 | struct acpi_hest_ia_corrected *cmc; | |
73 | cmc = (struct acpi_hest_ia_corrected *)hest_hdr; | |
74 | len = sizeof(*cmc) + cmc->num_hardware_banks * | |
75 | sizeof(struct acpi_hest_ia_error_bank); | |
76 | } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) { | |
77 | struct acpi_hest_ia_machine_check *mc; | |
78 | mc = (struct acpi_hest_ia_machine_check *)hest_hdr; | |
79 | len = sizeof(*mc) + mc->num_hardware_banks * | |
80 | sizeof(struct acpi_hest_ia_error_bank); | |
81 | } | |
82 | BUG_ON(len == -1); | |
83 | ||
84 | return len; | |
85 | }; | |
86 | ||
87 | int apei_hest_parse(apei_hest_func_t func, void *data) | |
88 | { | |
89 | struct acpi_hest_header *hest_hdr; | |
90 | int i, rc, len; | |
91 | ||
92 | if (hest_disable) | |
93 | return -EINVAL; | |
94 | ||
95 | hest_hdr = (struct acpi_hest_header *)(hest_tab + 1); | |
96 | for (i = 0; i < hest_tab->error_source_count; i++) { | |
97 | len = hest_esrc_len(hest_hdr); | |
98 | if (!len) { | |
99 | pr_warning(FW_WARN HEST_PFX | |
100 | "Unknown or unused hardware error source " | |
101 | "type: %d for hardware error source: %d.\n", | |
102 | hest_hdr->type, hest_hdr->source_id); | |
103 | return -EINVAL; | |
104 | } | |
105 | if ((void *)hest_hdr + len > | |
106 | (void *)hest_tab + hest_tab->header.length) { | |
107 | pr_warning(FW_BUG HEST_PFX | |
108 | "Table contents overflow for hardware error source: %d.\n", | |
109 | hest_hdr->source_id); | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | rc = func(hest_hdr, data); | |
114 | if (rc) | |
115 | return rc; | |
116 | ||
117 | hest_hdr = (void *)hest_hdr + len; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(apei_hest_parse); | |
123 | ||
7ad6e943 HY |
124 | struct ghes_arr { |
125 | struct platform_device **ghes_devs; | |
126 | unsigned int count; | |
127 | }; | |
128 | ||
129 | static int hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data) | |
130 | { | |
131 | int *count = data; | |
132 | ||
133 | if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR) | |
134 | (*count)++; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data) | |
139 | { | |
7ad6e943 HY |
140 | struct platform_device *ghes_dev; |
141 | struct ghes_arr *ghes_arr = data; | |
142 | int rc; | |
143 | ||
144 | if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR) | |
145 | return 0; | |
1dd6b20e JD |
146 | |
147 | if (!((struct acpi_hest_generic *)hest_hdr)->enabled) | |
7ad6e943 HY |
148 | return 0; |
149 | ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id); | |
150 | if (!ghes_dev) | |
151 | return -ENOMEM; | |
1dd6b20e JD |
152 | |
153 | rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *)); | |
154 | if (rc) | |
155 | goto err; | |
156 | ||
7ad6e943 HY |
157 | rc = platform_device_add(ghes_dev); |
158 | if (rc) | |
159 | goto err; | |
160 | ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev; | |
161 | ||
162 | return 0; | |
163 | err: | |
164 | platform_device_put(ghes_dev); | |
165 | return rc; | |
166 | } | |
167 | ||
168 | static int hest_ghes_dev_register(unsigned int ghes_count) | |
169 | { | |
170 | int rc, i; | |
171 | struct ghes_arr ghes_arr; | |
172 | ||
173 | ghes_arr.count = 0; | |
174 | ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL); | |
175 | if (!ghes_arr.ghes_devs) | |
176 | return -ENOMEM; | |
177 | ||
178 | rc = apei_hest_parse(hest_parse_ghes, &ghes_arr); | |
179 | if (rc) | |
180 | goto err; | |
181 | out: | |
182 | kfree(ghes_arr.ghes_devs); | |
183 | return rc; | |
184 | err: | |
185 | for (i = 0; i < ghes_arr.count; i++) | |
186 | platform_device_unregister(ghes_arr.ghes_devs[i]); | |
187 | goto out; | |
188 | } | |
189 | ||
9dc96664 HY |
190 | static int __init setup_hest_disable(char *str) |
191 | { | |
192 | hest_disable = 1; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | __setup("hest_disable", setup_hest_disable); | |
197 | ||
198 | static int __init hest_init(void) | |
199 | { | |
200 | acpi_status status; | |
201 | int rc = -ENODEV; | |
7ad6e943 | 202 | unsigned int ghes_count = 0; |
9dc96664 HY |
203 | |
204 | if (acpi_disabled) | |
205 | goto err; | |
206 | ||
207 | if (hest_disable) { | |
208 | pr_info(HEST_PFX "HEST tabling parsing is disabled.\n"); | |
209 | goto err; | |
210 | } | |
211 | ||
212 | status = acpi_get_table(ACPI_SIG_HEST, 0, | |
213 | (struct acpi_table_header **)&hest_tab); | |
214 | if (status == AE_NOT_FOUND) { | |
215 | pr_info(HEST_PFX "Table is not found!\n"); | |
216 | goto err; | |
217 | } else if (ACPI_FAILURE(status)) { | |
218 | const char *msg = acpi_format_exception(status); | |
219 | pr_err(HEST_PFX "Failed to get table, %s\n", msg); | |
220 | rc = -EINVAL; | |
221 | goto err; | |
222 | } | |
223 | ||
7ad6e943 HY |
224 | rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count); |
225 | if (rc) | |
226 | goto err; | |
227 | ||
228 | rc = hest_ghes_dev_register(ghes_count); | |
9dc96664 HY |
229 | if (rc) |
230 | goto err; | |
231 | ||
232 | pr_info(HEST_PFX "HEST table parsing is initialized.\n"); | |
233 | ||
234 | return 0; | |
235 | err: | |
236 | hest_disable = 1; | |
237 | return rc; | |
238 | } | |
239 | ||
240 | subsys_initcall(hest_init); |