Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/acpi/apei/hest.c

  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 
 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>
 32 #include <linux/io.h>
 33 #include <linux/platform_device.h>
 34 #include <acpi/apei.h>
 35 
 36 #include "apei-internal.h"
 37 
 38 #define HEST_PFX "HEST: "
 39 
 40 bool hest_disable;
 41 EXPORT_SYMBOL_GPL(hest_disable);
 42 
 43 /* HEST table parsing */
 44 
 45 static struct acpi_table_hest *__read_mostly hest_tab;
 46 
 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),
 55 };
 56 
 57 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
 58 {
 59         u16 hest_type = hest_hdr->type;
 60         int len;
 61 
 62         if (hest_type >= ACPI_HEST_TYPE_RESERVED)
 63                 return 0;
 64 
 65         len = hest_esrc_len_tab[hest_type];
 66 
 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);
 77         }
 78         BUG_ON(len == -1);
 79 
 80         return len;
 81 };
 82 
 83 int apei_hest_parse(apei_hest_func_t func, void *data)
 84 {
 85         struct acpi_hest_header *hest_hdr;
 86         int i, rc, len;
 87 
 88         if (hest_disable || !hest_tab)
 89                 return -EINVAL;
 90 
 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);
 94                 if (!len) {
 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);
 99                         return -EINVAL;
100                 }
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);
106                         return -EINVAL;
107                 }
108 
109                 rc = func(hest_hdr, data);
110                 if (rc)
111                         return rc;
112 
113                 hest_hdr = (void *)hest_hdr + len;
114         }
115 
116         return 0;
117 }
118 EXPORT_SYMBOL_GPL(apei_hest_parse);
119 
120 /*
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.
123  */
124 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
125 {
126         if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
127                 return 0;
128 
129         if (!acpi_disable_cmcff)
130                 return !arch_apei_enable_cmcff(hest_hdr, data);
131 
132         return 0;
133 }
134 
135 struct ghes_arr {
136         struct platform_device **ghes_devs;
137         unsigned int count;
138 };
139 
140 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
141 {
142         int *count = data;
143 
144         if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
145                 (*count)++;
146         return 0;
147 }
148 
149 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
150 {
151         struct platform_device *ghes_dev;
152         struct ghes_arr *ghes_arr = data;
153         int rc, i;
154 
155         if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
156                 return 0;
157 
158         if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
159                 return 0;
160         for (i = 0; i < ghes_arr->count; i++) {
161                 struct acpi_hest_header *hdr;
162                 ghes_dev = ghes_arr->ghes_devs[i];
163                 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
164                 if (hdr->source_id == hest_hdr->source_id) {
165                         pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
166                                    hdr->source_id);
167                         return -EIO;
168                 }
169         }
170         ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
171         if (!ghes_dev)
172                 return -ENOMEM;
173 
174         rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
175         if (rc)
176                 goto err;
177 
178         rc = platform_device_add(ghes_dev);
179         if (rc)
180                 goto err;
181         ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
182 
183         return 0;
184 err:
185         platform_device_put(ghes_dev);
186         return rc;
187 }
188 
189 static int __init hest_ghes_dev_register(unsigned int ghes_count)
190 {
191         int rc, i;
192         struct ghes_arr ghes_arr;
193 
194         ghes_arr.count = 0;
195         ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
196         if (!ghes_arr.ghes_devs)
197                 return -ENOMEM;
198 
199         rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
200         if (rc)
201                 goto err;
202 out:
203         kfree(ghes_arr.ghes_devs);
204         return rc;
205 err:
206         for (i = 0; i < ghes_arr.count; i++)
207                 platform_device_unregister(ghes_arr.ghes_devs[i]);
208         goto out;
209 }
210 
211 static int __init setup_hest_disable(char *str)
212 {
213         hest_disable = 1;
214         return 0;
215 }
216 
217 __setup("hest_disable", setup_hest_disable);
218 
219 void __init acpi_hest_init(void)
220 {
221         acpi_status status;
222         int rc = -ENODEV;
223         unsigned int ghes_count = 0;
224 
225         if (hest_disable) {
226                 pr_info(HEST_PFX "Table parsing disabled.\n");
227                 return;
228         }
229 
230         status = acpi_get_table(ACPI_SIG_HEST, 0,
231                                 (struct acpi_table_header **)&hest_tab);
232         if (status == AE_NOT_FOUND)
233                 goto err;
234         else if (ACPI_FAILURE(status)) {
235                 const char *msg = acpi_format_exception(status);
236                 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
237                 rc = -EINVAL;
238                 goto err;
239         }
240 
241         rc = apei_hest_parse(hest_parse_cmc, NULL);
242         if (rc)
243                 goto err;
244 
245         if (!ghes_disable) {
246                 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
247                 if (rc)
248                         goto err;
249                 rc = hest_ghes_dev_register(ghes_count);
250                 if (rc)
251                         goto err;
252         }
253 
254         pr_info(HEST_PFX "Table parsing has been initialized.\n");
255         return;
256 err:
257         hest_disable = 1;
258 }
259 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us