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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 #include <asm/mce.h>
 40 
 41 #include "apei-internal.h"
 42 
 43 #define HEST_PFX "HEST: "
 44 
 45 bool hest_disable;
 46 EXPORT_SYMBOL_GPL(hest_disable);
 47 
 48 /* HEST table parsing */
 49 
 50 static struct acpi_table_hest *__read_mostly hest_tab;
 51 
 52 static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
 53         [ACPI_HEST_TYPE_IA32_CHECK] = -1,       /* need further calculation */
 54         [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
 55         [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
 56         [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
 57         [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
 58         [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
 59         [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
 60 };
 61 
 62 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
 63 {
 64         u16 hest_type = hest_hdr->type;
 65         int len;
 66 
 67         if (hest_type >= ACPI_HEST_TYPE_RESERVED)
 68                 return 0;
 69 
 70         len = hest_esrc_len_tab[hest_type];
 71 
 72         if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
 73                 struct acpi_hest_ia_corrected *cmc;
 74                 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
 75                 len = sizeof(*cmc) + cmc->num_hardware_banks *
 76                         sizeof(struct acpi_hest_ia_error_bank);
 77         } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
 78                 struct acpi_hest_ia_machine_check *mc;
 79                 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
 80                 len = sizeof(*mc) + mc->num_hardware_banks *
 81                         sizeof(struct acpi_hest_ia_error_bank);
 82         }
 83         BUG_ON(len == -1);
 84 
 85         return len;
 86 };
 87 
 88 int apei_hest_parse(apei_hest_func_t func, void *data)
 89 {
 90         struct acpi_hest_header *hest_hdr;
 91         int i, rc, len;
 92 
 93         if (hest_disable || !hest_tab)
 94                 return -EINVAL;
 95 
 96         hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
 97         for (i = 0; i < hest_tab->error_source_count; i++) {
 98                 len = hest_esrc_len(hest_hdr);
 99                 if (!len) {
100                         pr_warning(FW_WARN HEST_PFX
101                                    "Unknown or unused hardware error source "
102                                    "type: %d for hardware error source: %d.\n",
103                                    hest_hdr->type, hest_hdr->source_id);
104                         return -EINVAL;
105                 }
106                 if ((void *)hest_hdr + len >
107                     (void *)hest_tab + hest_tab->header.length) {
108                         pr_warning(FW_BUG HEST_PFX
109                 "Table contents overflow for hardware error source: %d.\n",
110                                 hest_hdr->source_id);
111                         return -EINVAL;
112                 }
113 
114                 rc = func(hest_hdr, data);
115                 if (rc)
116                         return rc;
117 
118                 hest_hdr = (void *)hest_hdr + len;
119         }
120 
121         return 0;
122 }
123 EXPORT_SYMBOL_GPL(apei_hest_parse);
124 
125 /*
126  * Check if firmware advertises firmware first mode. We need FF bit to be set
127  * along with a set of MC banks which work in FF mode.
128  */
129 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
130 {
131 #ifdef CONFIG_X86_MCE
132         int i;
133         struct acpi_hest_ia_corrected *cmc;
134         struct acpi_hest_ia_error_bank *mc_bank;
135 
136         if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
137                 return 0;
138 
139         cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
140         if (!cmc->enabled)
141                 return 0;
142 
143         /*
144          * We expect HEST to provide a list of MC banks that report errors
145          * in firmware first mode. Otherwise, return non-zero value to
146          * indicate that we are done parsing HEST.
147          */
148         if (!(cmc->flags & ACPI_HEST_FIRMWARE_FIRST) || !cmc->num_hardware_banks)
149                 return 1;
150 
151         pr_info(HEST_PFX "Enabling Firmware First mode for corrected errors.\n");
152 
153         mc_bank = (struct acpi_hest_ia_error_bank *)(cmc + 1);
154         for (i = 0; i < cmc->num_hardware_banks; i++, mc_bank++)
155                 mce_disable_bank(mc_bank->bank_number);
156 #endif
157         return 1;
158 }
159 
160 struct ghes_arr {
161         struct platform_device **ghes_devs;
162         unsigned int count;
163 };
164 
165 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
166 {
167         int *count = data;
168 
169         if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
170                 (*count)++;
171         return 0;
172 }
173 
174 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
175 {
176         struct platform_device *ghes_dev;
177         struct ghes_arr *ghes_arr = data;
178         int rc, i;
179 
180         if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
181                 return 0;
182 
183         if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
184                 return 0;
185         for (i = 0; i < ghes_arr->count; i++) {
186                 struct acpi_hest_header *hdr;
187                 ghes_dev = ghes_arr->ghes_devs[i];
188                 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
189                 if (hdr->source_id == hest_hdr->source_id) {
190                         pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
191                                    hdr->source_id);
192                         return -EIO;
193                 }
194         }
195         ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
196         if (!ghes_dev)
197                 return -ENOMEM;
198 
199         rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
200         if (rc)
201                 goto err;
202 
203         rc = platform_device_add(ghes_dev);
204         if (rc)
205                 goto err;
206         ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
207 
208         return 0;
209 err:
210         platform_device_put(ghes_dev);
211         return rc;
212 }
213 
214 static int __init hest_ghes_dev_register(unsigned int ghes_count)
215 {
216         int rc, i;
217         struct ghes_arr ghes_arr;
218 
219         ghes_arr.count = 0;
220         ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
221         if (!ghes_arr.ghes_devs)
222                 return -ENOMEM;
223 
224         rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
225         if (rc)
226                 goto err;
227 out:
228         kfree(ghes_arr.ghes_devs);
229         return rc;
230 err:
231         for (i = 0; i < ghes_arr.count; i++)
232                 platform_device_unregister(ghes_arr.ghes_devs[i]);
233         goto out;
234 }
235 
236 static int __init setup_hest_disable(char *str)
237 {
238         hest_disable = 1;
239         return 0;
240 }
241 
242 __setup("hest_disable", setup_hest_disable);
243 
244 void __init acpi_hest_init(void)
245 {
246         acpi_status status;
247         int rc = -ENODEV;
248         unsigned int ghes_count = 0;
249 
250         if (hest_disable) {
251                 pr_info(HEST_PFX "Table parsing disabled.\n");
252                 return;
253         }
254 
255         status = acpi_get_table(ACPI_SIG_HEST, 0,
256                                 (struct acpi_table_header **)&hest_tab);
257         if (status == AE_NOT_FOUND)
258                 goto err;
259         else if (ACPI_FAILURE(status)) {
260                 const char *msg = acpi_format_exception(status);
261                 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
262                 rc = -EINVAL;
263                 goto err;
264         }
265 
266         if (!acpi_disable_cmcff)
267                 apei_hest_parse(hest_parse_cmc, NULL);
268 
269         if (!ghes_disable) {
270                 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
271                 if (rc)
272                         goto err;
273                 rc = hest_ghes_dev_register(ghes_count);
274                 if (rc)
275                         goto err;
276         }
277 
278         pr_info(HEST_PFX "Table parsing has been initialized.\n");
279         return;
280 err:
281         hest_disable = 1;
282 }
283 

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