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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); |