Huang Ying | 9dc9666 | 2010-05-18 14:35:13 +0800 | [diff] [blame] | 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 <acpi/apei.h> |
| 38 | |
| 39 | #include "apei-internal.h" |
| 40 | |
| 41 | #define HEST_PFX "HEST: " |
| 42 | |
| 43 | int hest_disable; |
| 44 | EXPORT_SYMBOL_GPL(hest_disable); |
| 45 | |
| 46 | /* HEST table parsing */ |
| 47 | |
| 48 | static struct acpi_table_hest *hest_tab; |
| 49 | |
| 50 | static int hest_void_parse(struct acpi_hest_header *hest_hdr, void *data) |
| 51 | { |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = { |
| 56 | [ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */ |
| 57 | [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1, |
| 58 | [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi), |
| 59 | [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root), |
| 60 | [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer), |
| 61 | [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge), |
| 62 | [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic), |
| 63 | }; |
| 64 | |
| 65 | static int hest_esrc_len(struct acpi_hest_header *hest_hdr) |
| 66 | { |
| 67 | u16 hest_type = hest_hdr->type; |
| 68 | int len; |
| 69 | |
| 70 | if (hest_type >= ACPI_HEST_TYPE_RESERVED) |
| 71 | return 0; |
| 72 | |
| 73 | len = hest_esrc_len_tab[hest_type]; |
| 74 | |
| 75 | if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) { |
| 76 | struct acpi_hest_ia_corrected *cmc; |
| 77 | cmc = (struct acpi_hest_ia_corrected *)hest_hdr; |
| 78 | len = sizeof(*cmc) + cmc->num_hardware_banks * |
| 79 | sizeof(struct acpi_hest_ia_error_bank); |
| 80 | } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) { |
| 81 | struct acpi_hest_ia_machine_check *mc; |
| 82 | mc = (struct acpi_hest_ia_machine_check *)hest_hdr; |
| 83 | len = sizeof(*mc) + mc->num_hardware_banks * |
| 84 | sizeof(struct acpi_hest_ia_error_bank); |
| 85 | } |
| 86 | BUG_ON(len == -1); |
| 87 | |
| 88 | return len; |
| 89 | }; |
| 90 | |
| 91 | int apei_hest_parse(apei_hest_func_t func, void *data) |
| 92 | { |
| 93 | struct acpi_hest_header *hest_hdr; |
| 94 | int i, rc, len; |
| 95 | |
| 96 | if (hest_disable) |
| 97 | return -EINVAL; |
| 98 | |
| 99 | hest_hdr = (struct acpi_hest_header *)(hest_tab + 1); |
| 100 | for (i = 0; i < hest_tab->error_source_count; i++) { |
| 101 | len = hest_esrc_len(hest_hdr); |
| 102 | if (!len) { |
| 103 | pr_warning(FW_WARN HEST_PFX |
| 104 | "Unknown or unused hardware error source " |
| 105 | "type: %d for hardware error source: %d.\n", |
| 106 | hest_hdr->type, hest_hdr->source_id); |
| 107 | return -EINVAL; |
| 108 | } |
| 109 | if ((void *)hest_hdr + len > |
| 110 | (void *)hest_tab + hest_tab->header.length) { |
| 111 | pr_warning(FW_BUG HEST_PFX |
| 112 | "Table contents overflow for hardware error source: %d.\n", |
| 113 | hest_hdr->source_id); |
| 114 | return -EINVAL; |
| 115 | } |
| 116 | |
| 117 | rc = func(hest_hdr, data); |
| 118 | if (rc) |
| 119 | return rc; |
| 120 | |
| 121 | hest_hdr = (void *)hest_hdr + len; |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | EXPORT_SYMBOL_GPL(apei_hest_parse); |
| 127 | |
| 128 | static int __init setup_hest_disable(char *str) |
| 129 | { |
| 130 | hest_disable = 1; |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | __setup("hest_disable", setup_hest_disable); |
| 135 | |
| 136 | static int __init hest_init(void) |
| 137 | { |
| 138 | acpi_status status; |
| 139 | int rc = -ENODEV; |
| 140 | |
| 141 | if (acpi_disabled) |
| 142 | goto err; |
| 143 | |
| 144 | if (hest_disable) { |
| 145 | pr_info(HEST_PFX "HEST tabling parsing is disabled.\n"); |
| 146 | goto err; |
| 147 | } |
| 148 | |
| 149 | status = acpi_get_table(ACPI_SIG_HEST, 0, |
| 150 | (struct acpi_table_header **)&hest_tab); |
| 151 | if (status == AE_NOT_FOUND) { |
| 152 | pr_info(HEST_PFX "Table is not found!\n"); |
| 153 | goto err; |
| 154 | } else if (ACPI_FAILURE(status)) { |
| 155 | const char *msg = acpi_format_exception(status); |
| 156 | pr_err(HEST_PFX "Failed to get table, %s\n", msg); |
| 157 | rc = -EINVAL; |
| 158 | goto err; |
| 159 | } |
| 160 | |
| 161 | rc = apei_hest_parse(hest_void_parse, NULL); |
| 162 | if (rc) |
| 163 | goto err; |
| 164 | |
| 165 | pr_info(HEST_PFX "HEST table parsing is initialized.\n"); |
| 166 | |
| 167 | return 0; |
| 168 | err: |
| 169 | hest_disable = 1; |
| 170 | return rc; |
| 171 | } |
| 172 | |
| 173 | subsys_initcall(hest_init); |