| Huang Ying | 06d65de | 2010-05-18 14:35:19 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * UEFI Common Platform Error Record (CPER) support |
| 3 | * |
| 4 | * Copyright (C) 2010, Intel Corp. |
| 5 | * Author: Huang Ying <ying.huang@intel.com> |
| 6 | * |
| 7 | * CPER is the format used to describe platform hardware error by |
| 8 | * various APEI tables, such as ERST, BERT and HEST etc. |
| 9 | * |
| 10 | * For more information about CPER, please refer to Appendix N of UEFI |
| 11 | * Specification version 2.3. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License version |
| 15 | * 2 as published by the Free Software Foundation. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/time.h> |
| 30 | #include <linux/cper.h> |
| 31 | #include <linux/acpi.h> |
| 32 | |
| 33 | /* |
| 34 | * CPER record ID need to be unique even after reboot, because record |
| 35 | * ID is used as index for ERST storage, while CPER records from |
| 36 | * multiple boot may co-exist in ERST. |
| 37 | */ |
| 38 | u64 cper_next_record_id(void) |
| 39 | { |
| 40 | static atomic64_t seq; |
| 41 | |
| 42 | if (!atomic64_read(&seq)) |
| 43 | atomic64_set(&seq, ((u64)get_seconds()) << 32); |
| 44 | |
| 45 | return atomic64_inc_return(&seq); |
| 46 | } |
| 47 | EXPORT_SYMBOL_GPL(cper_next_record_id); |
| 48 | |
| 49 | int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus) |
| 50 | { |
| 51 | if (estatus->data_length && |
| 52 | estatus->data_length < sizeof(struct acpi_hest_generic_data)) |
| 53 | return -EINVAL; |
| 54 | if (estatus->raw_data_length && |
| 55 | estatus->raw_data_offset < sizeof(*estatus) + estatus->data_length) |
| 56 | return -EINVAL; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | EXPORT_SYMBOL_GPL(apei_estatus_check_header); |
| 61 | |
| 62 | int apei_estatus_check(const struct acpi_hest_generic_status *estatus) |
| 63 | { |
| 64 | struct acpi_hest_generic_data *gdata; |
| 65 | unsigned int data_len, gedata_len; |
| 66 | int rc; |
| 67 | |
| 68 | rc = apei_estatus_check_header(estatus); |
| 69 | if (rc) |
| 70 | return rc; |
| 71 | data_len = estatus->data_length; |
| 72 | gdata = (struct acpi_hest_generic_data *)(estatus + 1); |
| 73 | while (data_len > sizeof(*gdata)) { |
| 74 | gedata_len = gdata->error_data_length; |
| 75 | if (gedata_len > data_len - sizeof(*gdata)) |
| 76 | return -EINVAL; |
| 77 | data_len -= gedata_len + sizeof(*gdata); |
| 78 | } |
| 79 | if (data_len) |
| 80 | return -EINVAL; |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | EXPORT_SYMBOL_GPL(apei_estatus_check); |