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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 
 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         return arch_apei_enable_cmcff(hest_hdr, data);
127 }
128 
129 struct ghes_arr {
130         struct platform_device **ghes_devs;
131         unsigned int count;
132 };
133 
134 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
135 {
136         int *count = data;
137 
138         if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
139                 (*count)++;
140         return 0;
141 }
142 
143 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
144 {
145         struct platform_device *ghes_dev;
146         struct ghes_arr *ghes_arr = data;
147         int rc, i;
148 
149         if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
150                 return 0;
151 
152         if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
153                 return 0;
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",
160                                    hdr->source_id);
161                         return -EIO;
162                 }
163         }
164         ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
165         if (!ghes_dev)
166                 return -ENOMEM;
167 
168         rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
169         if (rc)
170                 goto err;
171 
172         rc = platform_device_add(ghes_dev);
173         if (rc)
174                 goto err;
175         ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
176 
177         return 0;
178 err:
179         platform_device_put(ghes_dev);
180         return rc;
181 }
182 
183 static int __init hest_ghes_dev_register(unsigned int ghes_count)
184 {
185         int rc, i;
186         struct ghes_arr ghes_arr;
187 
188         ghes_arr.count = 0;
189         ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
190         if (!ghes_arr.ghes_devs)
191                 return -ENOMEM;
192 
193         rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
194         if (rc)
195                 goto err;
196 out:
197         kfree(ghes_arr.ghes_devs);
198         return rc;
199 err:
200         for (i = 0; i < ghes_arr.count; i++)
201                 platform_device_unregister(ghes_arr.ghes_devs[i]);
202         goto out;
203 }
204 
205 static int __init setup_hest_disable(char *str)
206 {
207         hest_disable = 1;
208         return 0;
209 }
210 
211 __setup("hest_disable", setup_hest_disable);
212 
213 void __init acpi_hest_init(void)
214 {
215         acpi_status status;
216         int rc = -ENODEV;
217         unsigned int ghes_count = 0;
218 
219         if (hest_disable) {
220                 pr_info(HEST_PFX "Table parsing disabled.\n");
221                 return;
222         }
223 
224         status = acpi_get_table(ACPI_SIG_HEST, 0,
225                                 (struct acpi_table_header **)&hest_tab);
226         if (status == AE_NOT_FOUND)
227                 goto err;
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);
231                 rc = -EINVAL;
232                 goto err;
233         }
234 
235         if (!acpi_disable_cmcff)
236                 apei_hest_parse(hest_parse_cmc, NULL);
237 
238         if (!ghes_disable) {
239                 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
240                 if (rc)
241                         goto err;
242                 rc = hest_ghes_dev_register(ghes_count);
243                 if (rc)
244                         goto err;
245         }
246 
247         pr_info(HEST_PFX "Table parsing has been initialized.\n");
248         return;
249 err:
250         hest_disable = 1;
251 }
252 

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