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 }