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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d334a491 HY |
2 | /* |
3 | * Bridge between MCE and APEI | |
4 | * | |
5 | * On some machine, corrected memory errors are reported via APEI | |
6 | * generic hardware error source (GHES) instead of corrected Machine | |
7 | * Check. These corrected memory errors can be reported to user space | |
8 | * through /dev/mcelog via faking a corrected Machine Check, so that | |
9 | * the error memory page can be offlined by /sbin/mcelog if the error | |
10 | * count for one page is beyond the threshold. | |
11 | * | |
482908b4 HY |
12 | * For fatal MCE, save MCE record into persistent storage via ERST, so |
13 | * that the MCE record can be logged after reboot via ERST. | |
14 | * | |
d334a491 HY |
15 | * Copyright 2010 Intel Corp. |
16 | * Author: Huang Ying <ying.huang@intel.com> | |
d334a491 HY |
17 | */ |
18 | ||
69c60c88 | 19 | #include <linux/export.h> |
d334a491 HY |
20 | #include <linux/kernel.h> |
21 | #include <linux/acpi.h> | |
22 | #include <linux/cper.h> | |
23 | #include <acpi/apei.h> | |
addccbb2 | 24 | #include <acpi/ghes.h> |
d334a491 HY |
25 | #include <asm/mce.h> |
26 | ||
21afaf18 | 27 | #include "internal.h" |
d334a491 | 28 | |
addccbb2 | 29 | void apei_mce_report_mem_error(int severity, struct cper_sec_mem_err *mem_err) |
d334a491 HY |
30 | { |
31 | struct mce m; | |
32 | ||
addccbb2 | 33 | if (!(mem_err->validation_bits & CPER_MEM_VALID_PA)) |
d334a491 HY |
34 | return; |
35 | ||
36 | mce_setup(&m); | |
b2de4360 | 37 | m.bank = -1; |
addccbb2 | 38 | /* Fake a memory read error with unknown channel */ |
d334a491 | 39 | m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | 0x9f; |
addccbb2 CG |
40 | |
41 | if (severity >= GHES_SEV_RECOVERABLE) | |
42 | m.status |= MCI_STATUS_UC; | |
669c00f0 BP |
43 | |
44 | if (severity >= GHES_SEV_PANIC) { | |
addccbb2 | 45 | m.status |= MCI_STATUS_PCC; |
669c00f0 BP |
46 | m.tsc = rdtsc(); |
47 | } | |
addccbb2 | 48 | |
d334a491 HY |
49 | m.addr = mem_err->physical_addr; |
50 | mce_log(&m); | |
d334a491 HY |
51 | } |
52 | EXPORT_SYMBOL_GPL(apei_mce_report_mem_error); | |
482908b4 HY |
53 | |
54 | #define CPER_CREATOR_MCE \ | |
b62928ff AS |
55 | GUID_INIT(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \ |
56 | 0x64, 0x90, 0xb8, 0x9d) | |
482908b4 | 57 | #define CPER_SECTION_TYPE_MCE \ |
b62928ff AS |
58 | GUID_INIT(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \ |
59 | 0x04, 0x4a, 0x38, 0xfc) | |
482908b4 HY |
60 | |
61 | /* | |
62 | * CPER specification (in UEFI specification 2.3 appendix N) requires | |
63 | * byte-packed. | |
64 | */ | |
65 | struct cper_mce_record { | |
66 | struct cper_record_header hdr; | |
67 | struct cper_section_descriptor sec_hdr; | |
68 | struct mce mce; | |
69 | } __packed; | |
70 | ||
71 | int apei_write_mce(struct mce *m) | |
72 | { | |
73 | struct cper_mce_record rcd; | |
74 | ||
75 | memset(&rcd, 0, sizeof(rcd)); | |
76 | memcpy(rcd.hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE); | |
77 | rcd.hdr.revision = CPER_RECORD_REV; | |
78 | rcd.hdr.signature_end = CPER_SIG_END; | |
79 | rcd.hdr.section_count = 1; | |
ad4ecef2 | 80 | rcd.hdr.error_severity = CPER_SEV_FATAL; |
482908b4 HY |
81 | /* timestamp, platform_id, partition_id are all invalid */ |
82 | rcd.hdr.validation_bits = 0; | |
83 | rcd.hdr.record_length = sizeof(rcd); | |
84 | rcd.hdr.creator_id = CPER_CREATOR_MCE; | |
85 | rcd.hdr.notification_type = CPER_NOTIFY_MCE; | |
86 | rcd.hdr.record_id = cper_next_record_id(); | |
87 | rcd.hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR; | |
88 | ||
89 | rcd.sec_hdr.section_offset = (void *)&rcd.mce - (void *)&rcd; | |
90 | rcd.sec_hdr.section_length = sizeof(rcd.mce); | |
91 | rcd.sec_hdr.revision = CPER_SEC_REV; | |
92 | /* fru_id and fru_text is invalid */ | |
93 | rcd.sec_hdr.validation_bits = 0; | |
94 | rcd.sec_hdr.flags = CPER_SEC_PRIMARY; | |
95 | rcd.sec_hdr.section_type = CPER_SECTION_TYPE_MCE; | |
ad4ecef2 | 96 | rcd.sec_hdr.section_severity = CPER_SEV_FATAL; |
482908b4 HY |
97 | |
98 | memcpy(&rcd.mce, m, sizeof(*m)); | |
99 | ||
100 | return erst_write(&rcd.hdr); | |
101 | } | |
102 | ||
103 | ssize_t apei_read_mce(struct mce *m, u64 *record_id) | |
104 | { | |
105 | struct cper_mce_record rcd; | |
885b976f HY |
106 | int rc, pos; |
107 | ||
108 | rc = erst_get_record_id_begin(&pos); | |
109 | if (rc) | |
110 | return rc; | |
111 | retry: | |
112 | rc = erst_get_record_id_next(&pos, record_id); | |
113 | if (rc) | |
114 | goto out; | |
115 | /* no more record */ | |
116 | if (*record_id == APEI_ERST_INVALID_RECORD_ID) | |
117 | goto out; | |
118 | rc = erst_read(*record_id, &rcd.hdr, sizeof(rcd)); | |
119 | /* someone else has cleared the record, try next one */ | |
120 | if (rc == -ENOENT) | |
121 | goto retry; | |
122 | else if (rc < 0) | |
123 | goto out; | |
124 | /* try to skip other type records in storage */ | |
125 | else if (rc != sizeof(rcd) || | |
b62928ff | 126 | !guid_equal(&rcd.hdr.creator_id, &CPER_CREATOR_MCE)) |
885b976f | 127 | goto retry; |
482908b4 | 128 | memcpy(m, &rcd.mce, sizeof(*m)); |
885b976f HY |
129 | rc = sizeof(*m); |
130 | out: | |
131 | erst_get_record_id_end(); | |
482908b4 | 132 | |
885b976f | 133 | return rc; |
482908b4 HY |
134 | } |
135 | ||
136 | /* Check whether there is record in ERST */ | |
137 | int apei_check_mce(void) | |
138 | { | |
139 | return erst_get_record_count(); | |
140 | } | |
141 | ||
142 | int apei_clear_mce(u64 record_id) | |
143 | { | |
144 | return erst_clear(record_id); | |
145 | } |