2 * Bridge between MCE and APEI
4 * On some machine, corrected memory errors are reported via APEI
5 * generic hardware error source (GHES) instead of corrected Machine
6 * Check. These corrected memory errors can be reported to user space
7 * through /dev/mcelog via faking a corrected Machine Check, so that
8 * the error memory page can be offlined by /sbin/mcelog if the error
9 * count for one page is beyond the threshold.
11 * For fatal MCE, save MCE record into persistent storage via ERST, so
12 * that the MCE record can be logged after reboot via ERST.
14 * Copyright 2010 Intel Corp.
15 * Author: Huang Ying <ying.huang@intel.com>
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License version
19 * 2 as published by the Free Software Foundation.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <linux/kernel.h>
32 #include <linux/acpi.h>
33 #include <linux/cper.h>
34 #include <acpi/apei.h>
37 #include "mce-internal.h"
39 void apei_mce_report_mem_error(int corrected
, struct cper_sec_mem_err
*mem_err
)
43 /* Only corrected MC is reported */
49 /* Fake a memory read corrected error with unknown channel */
50 m
.status
= MCI_STATUS_VAL
| MCI_STATUS_EN
| MCI_STATUS_ADDRV
| 0x9f;
51 m
.addr
= mem_err
->physical_addr
;
55 EXPORT_SYMBOL_GPL(apei_mce_report_mem_error
);
57 #define CPER_CREATOR_MCE \
58 UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \
59 0x64, 0x90, 0xb8, 0x9d)
60 #define CPER_SECTION_TYPE_MCE \
61 UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \
62 0x04, 0x4a, 0x38, 0xfc)
65 * CPER specification (in UEFI specification 2.3 appendix N) requires
68 struct cper_mce_record
{
69 struct cper_record_header hdr
;
70 struct cper_section_descriptor sec_hdr
;
74 int apei_write_mce(struct mce
*m
)
76 struct cper_mce_record rcd
;
78 memset(&rcd
, 0, sizeof(rcd
));
79 memcpy(rcd
.hdr
.signature
, CPER_SIG_RECORD
, CPER_SIG_SIZE
);
80 rcd
.hdr
.revision
= CPER_RECORD_REV
;
81 rcd
.hdr
.signature_end
= CPER_SIG_END
;
82 rcd
.hdr
.section_count
= 1;
83 rcd
.hdr
.error_severity
= CPER_SEV_FATAL
;
84 /* timestamp, platform_id, partition_id are all invalid */
85 rcd
.hdr
.validation_bits
= 0;
86 rcd
.hdr
.record_length
= sizeof(rcd
);
87 rcd
.hdr
.creator_id
= CPER_CREATOR_MCE
;
88 rcd
.hdr
.notification_type
= CPER_NOTIFY_MCE
;
89 rcd
.hdr
.record_id
= cper_next_record_id();
90 rcd
.hdr
.flags
= CPER_HW_ERROR_FLAGS_PREVERR
;
92 rcd
.sec_hdr
.section_offset
= (void *)&rcd
.mce
- (void *)&rcd
;
93 rcd
.sec_hdr
.section_length
= sizeof(rcd
.mce
);
94 rcd
.sec_hdr
.revision
= CPER_SEC_REV
;
95 /* fru_id and fru_text is invalid */
96 rcd
.sec_hdr
.validation_bits
= 0;
97 rcd
.sec_hdr
.flags
= CPER_SEC_PRIMARY
;
98 rcd
.sec_hdr
.section_type
= CPER_SECTION_TYPE_MCE
;
99 rcd
.sec_hdr
.section_severity
= CPER_SEV_FATAL
;
101 memcpy(&rcd
.mce
, m
, sizeof(*m
));
103 return erst_write(&rcd
.hdr
);
106 ssize_t
apei_read_mce(struct mce
*m
, u64
*record_id
)
108 struct cper_mce_record rcd
;
111 len
= erst_read_next(&rcd
.hdr
, sizeof(rcd
));
114 /* Can not skip other records in storage via ERST unless clear them */
115 else if (len
!= sizeof(rcd
) ||
116 uuid_le_cmp(rcd
.hdr
.creator_id
, CPER_CREATOR_MCE
)) {
117 if (printk_ratelimit())
119 "MCE-APEI: Can not skip the unknown record in ERST");
123 memcpy(m
, &rcd
.mce
, sizeof(*m
));
124 *record_id
= rcd
.hdr
.record_id
;
129 /* Check whether there is record in ERST */
130 int apei_check_mce(void)
132 return erst_get_record_count();
135 int apei_clear_mce(u64 record_id
)
137 return erst_clear(record_id
);