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// SPDX-License-Identifier: GPL-2.0-only
/*
* Bridge between MCE and APEI
*
* On some machine, corrected memory errors are reported via APEI
* generic hardware error source (GHES) instead of corrected Machine
* Check. These corrected memory errors can be reported to user space
* through /dev/mcelog via faking a corrected Machine Check, so that
* the error memory page can be offlined by /sbin/mcelog if the error
* count for one page is beyond the threshold.
*
* For fatal MCE, save MCE record into persistent storage via ERST, so
* that the MCE record can be logged after reboot via ERST.
*
* Copyright 2010 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/cper.h>
#include <acpi/apei.h>
#include <acpi/ghes.h>
#include <asm/mce.h>
#include "internal.h"
void apei_mce_report_mem_error(int severity, struct cper_sec_mem_err *mem_err)
{
struct mce m;
if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
return;
mce_setup(&m);
m.bank = -1;
/* Fake a memory read error with unknown channel */
m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | 0x9f;
if (severity >= GHES_SEV_RECOVERABLE)
m.status |= MCI_STATUS_UC;
if (severity >= GHES_SEV_PANIC) {
m.status |= MCI_STATUS_PCC;
m.tsc = rdtsc();
}
m.addr = mem_err->physical_addr;
mce_log(&m);
}
EXPORT_SYMBOL_GPL(apei_mce_report_mem_error);
#define CPER_CREATOR_MCE \
GUID_INIT(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \
0x64, 0x90, 0xb8, 0x9d)
#define CPER_SECTION_TYPE_MCE \
GUID_INIT(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \
0x04, 0x4a, 0x38, 0xfc)
/*
* CPER specification (in UEFI specification 2.3 appendix N) requires
* byte-packed.
*/
struct cper_mce_record {
struct cper_record_header hdr;
struct cper_section_descriptor sec_hdr;
struct mce mce;
} __packed;
int apei_write_mce(struct mce *m)
{
struct cper_mce_record rcd;
memset(&rcd, 0, sizeof(rcd));
memcpy(rcd.hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE);
rcd.hdr.revision = CPER_RECORD_REV;
rcd.hdr.signature_end = CPER_SIG_END;
rcd.hdr.section_count = 1;
rcd.hdr.error_severity = CPER_SEV_FATAL;
/* timestamp, platform_id, partition_id are all invalid */
rcd.hdr.validation_bits = 0;
rcd.hdr.record_length = sizeof(rcd);
rcd.hdr.creator_id = CPER_CREATOR_MCE;
rcd.hdr.notification_type = CPER_NOTIFY_MCE;
rcd.hdr.record_id = cper_next_record_id();
rcd.hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR;
rcd.sec_hdr.section_offset = (void *)&rcd.mce - (void *)&rcd;
rcd.sec_hdr.section_length = sizeof(rcd.mce);
rcd.sec_hdr.revision = CPER_SEC_REV;
/* fru_id and fru_text is invalid */
rcd.sec_hdr.validation_bits = 0;
rcd.sec_hdr.flags = CPER_SEC_PRIMARY;
rcd.sec_hdr.section_type = CPER_SECTION_TYPE_MCE;
rcd.sec_hdr.section_severity = CPER_SEV_FATAL;
memcpy(&rcd.mce, m, sizeof(*m));
return erst_write(&rcd.hdr);
}
ssize_t apei_read_mce(struct mce *m, u64 *record_id)
{
struct cper_mce_record rcd;
int rc, pos;
rc = erst_get_record_id_begin(&pos);
if (rc)
return rc;
retry:
rc = erst_get_record_id_next(&pos, record_id);
if (rc)
goto out;
/* no more record */
if (*record_id == APEI_ERST_INVALID_RECORD_ID)
goto out;
rc = erst_read(*record_id, &rcd.hdr, sizeof(rcd));
/* someone else has cleared the record, try next one */
if (rc == -ENOENT)
goto retry;
else if (rc < 0)
goto out;
/* try to skip other type records in storage */
else if (rc != sizeof(rcd) ||
!guid_equal(&rcd.hdr.creator_id, &CPER_CREATOR_MCE))
goto retry;
memcpy(m, &rcd.mce, sizeof(*m));
rc = sizeof(*m);
out:
erst_get_record_id_end();
return rc;
}
/* Check whether there is record in ERST */
int apei_check_mce(void)
{
return erst_get_record_count();
}
int apei_clear_mce(u64 record_id)
{
return erst_clear(record_id);
}
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