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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  * 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>
 37 #include <linux/platform_device.h>
 38 #include <acpi/apei.h>
 39 
 40 #include "apei-internal.h"
 41 
 42 #define HEST_PFX "HEST: "
 43 
 44 bool hest_disable;
 45 EXPORT_SYMBOL_GPL(hest_disable);
 46 
 47 /* HEST table parsing */
 48 
 49 static struct acpi_table_hest *__read_mostly hest_tab;
 50 
 51 static const 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 || !hest_tab)
 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 
124 /*
125  * Check if firmware advertises firmware first mode. We need FF bit to be set
126  * along with a set of MC banks which work in FF mode.
127  */
128 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
129 {
130         return arch_apei_enable_cmcff(hest_hdr, data);
131 }
132 
133 struct ghes_arr {
134         struct platform_device **ghes_devs;
135         unsigned int count;
136 };
137 
138 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
139 {
140         int *count = data;
141 
142         if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
143                 (*count)++;
144         return 0;
145 }
146 
147 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
148 {
149         struct platform_device *ghes_dev;
150         struct ghes_arr *ghes_arr = data;
151         int rc, i;
152 
153         if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
154                 return 0;
155 
156         if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
157                 return 0;
158         for (i = 0; i < ghes_arr->count; i++) {
159                 struct acpi_hest_header *hdr;
160                 ghes_dev = ghes_arr->ghes_devs[i];
161                 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
162                 if (hdr->source_id == hest_hdr->source_id) {
163                         pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
164                                    hdr->source_id);
165                         return -EIO;
166                 }
167         }
168         ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
169         if (!ghes_dev)
170                 return -ENOMEM;
171 
172         rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
173         if (rc)
174                 goto err;
175 
176         rc = platform_device_add(ghes_dev);
177         if (rc)
178                 goto err;
179         ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
180 
181         return 0;
182 err:
183         platform_device_put(ghes_dev);
184         return rc;
185 }
186 
187 static int __init hest_ghes_dev_register(unsigned int ghes_count)
188 {
189         int rc, i;
190         struct ghes_arr ghes_arr;
191 
192         ghes_arr.count = 0;
193         ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
194         if (!ghes_arr.ghes_devs)
195                 return -ENOMEM;
196 
197         rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
198         if (rc)
199                 goto err;
200 out:
201         kfree(ghes_arr.ghes_devs);
202         return rc;
203 err:
204         for (i = 0; i < ghes_arr.count; i++)
205                 platform_device_unregister(ghes_arr.ghes_devs[i]);
206         goto out;
207 }
208 
209 static int __init setup_hest_disable(char *str)
210 {
211         hest_disable = 1;
212         return 0;
213 }
214 
215 __setup("hest_disable", setup_hest_disable);
216 
217 void __init acpi_hest_init(void)
218 {
219         acpi_status status;
220         int rc = -ENODEV;
221         unsigned int ghes_count = 0;
222 
223         if (hest_disable) {
224                 pr_info(HEST_PFX "Table parsing disabled.\n");
225                 return;
226         }
227 
228         status = acpi_get_table(ACPI_SIG_HEST, 0,
229                                 (struct acpi_table_header **)&hest_tab);
230         if (status == AE_NOT_FOUND)
231                 goto err;
232         else if (ACPI_FAILURE(status)) {
233                 const char *msg = acpi_format_exception(status);
234                 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
235                 rc = -EINVAL;
236                 goto err;
237         }
238 
239         if (!acpi_disable_cmcff)
240                 apei_hest_parse(hest_parse_cmc, NULL);
241 
242         if (!ghes_disable) {
243                 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
244                 if (rc)
245                         goto err;
246                 rc = hest_ghes_dev_register(ghes_count);
247                 if (rc)
248                         goto err;
249         }
250 
251         pr_info(HEST_PFX "Table parsing has been initialized.\n");
252         return;
253 err:
254         hest_disable = 1;
255 }
256 

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