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885b976fad
APEI ERST firmware interface and implementation has no multiple users in mind. For example, if there is four records in storage with ID: 1, 2, 3 and 4, if two ERST readers enumerate the records via GET_NEXT_RECORD_ID as follow, reader 1 reader 2 1 2 3 4 -1 -1 where -1 signals there is no more record ID. Reader 1 has no chance to check record 2 and 4, while reader 2 has no chance to check record 1 and 3. And any other GET_NEXT_RECORD_ID will return -1, that is, other readers will has no chance to check any record even they are not cleared by anyone. This makes raw GET_NEXT_RECORD_ID not suitable for used by multiple users. To solve the issue, an in-memory ERST record ID cache is designed and implemented. When enumerating record ID, the ID returned by GET_NEXT_RECORD_ID is added into cache in addition to be returned to caller. So other readers can check the cache to get all record ID available. Signed-off-by: Huang Ying <ying.huang@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/*
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* Bridge between MCE and APEI
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*
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* On some machine, corrected memory errors are reported via APEI
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* generic hardware error source (GHES) instead of corrected Machine
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* Check. These corrected memory errors can be reported to user space
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* through /dev/mcelog via faking a corrected Machine Check, so that
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* the error memory page can be offlined by /sbin/mcelog if the error
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* count for one page is beyond the threshold.
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*
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* For fatal MCE, save MCE record into persistent storage via ERST, so
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* that the MCE record can be logged after reboot via ERST.
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*
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* Copyright 2010 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/cper.h>
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#include <acpi/apei.h>
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#include <asm/mce.h>
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#include "mce-internal.h"
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void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err)
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{
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struct mce m;
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/* Only corrected MC is reported */
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if (!corrected)
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return;
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mce_setup(&m);
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m.bank = 1;
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/* Fake a memory read corrected error with unknown channel */
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m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | 0x9f;
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m.addr = mem_err->physical_addr;
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mce_log(&m);
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mce_notify_irq();
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}
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EXPORT_SYMBOL_GPL(apei_mce_report_mem_error);
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#define CPER_CREATOR_MCE \
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UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \
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0x64, 0x90, 0xb8, 0x9d)
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#define CPER_SECTION_TYPE_MCE \
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UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \
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0x04, 0x4a, 0x38, 0xfc)
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/*
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* CPER specification (in UEFI specification 2.3 appendix N) requires
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* byte-packed.
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*/
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struct cper_mce_record {
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struct cper_record_header hdr;
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struct cper_section_descriptor sec_hdr;
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struct mce mce;
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} __packed;
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int apei_write_mce(struct mce *m)
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{
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struct cper_mce_record rcd;
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memset(&rcd, 0, sizeof(rcd));
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memcpy(rcd.hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE);
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rcd.hdr.revision = CPER_RECORD_REV;
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rcd.hdr.signature_end = CPER_SIG_END;
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rcd.hdr.section_count = 1;
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rcd.hdr.error_severity = CPER_SEV_FATAL;
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/* timestamp, platform_id, partition_id are all invalid */
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rcd.hdr.validation_bits = 0;
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rcd.hdr.record_length = sizeof(rcd);
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rcd.hdr.creator_id = CPER_CREATOR_MCE;
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rcd.hdr.notification_type = CPER_NOTIFY_MCE;
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rcd.hdr.record_id = cper_next_record_id();
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rcd.hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR;
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rcd.sec_hdr.section_offset = (void *)&rcd.mce - (void *)&rcd;
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rcd.sec_hdr.section_length = sizeof(rcd.mce);
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rcd.sec_hdr.revision = CPER_SEC_REV;
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/* fru_id and fru_text is invalid */
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rcd.sec_hdr.validation_bits = 0;
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rcd.sec_hdr.flags = CPER_SEC_PRIMARY;
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rcd.sec_hdr.section_type = CPER_SECTION_TYPE_MCE;
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rcd.sec_hdr.section_severity = CPER_SEV_FATAL;
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memcpy(&rcd.mce, m, sizeof(*m));
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return erst_write(&rcd.hdr);
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}
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ssize_t apei_read_mce(struct mce *m, u64 *record_id)
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{
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struct cper_mce_record rcd;
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int rc, pos;
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rc = erst_get_record_id_begin(&pos);
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if (rc)
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return rc;
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retry:
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rc = erst_get_record_id_next(&pos, record_id);
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if (rc)
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goto out;
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/* no more record */
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if (*record_id == APEI_ERST_INVALID_RECORD_ID)
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goto out;
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rc = erst_read(*record_id, &rcd.hdr, sizeof(rcd));
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/* someone else has cleared the record, try next one */
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if (rc == -ENOENT)
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goto retry;
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else if (rc < 0)
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goto out;
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/* try to skip other type records in storage */
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else if (rc != sizeof(rcd) ||
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uuid_le_cmp(rcd.hdr.creator_id, CPER_CREATOR_MCE))
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goto retry;
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memcpy(m, &rcd.mce, sizeof(*m));
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rc = sizeof(*m);
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out:
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erst_get_record_id_end();
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return rc;
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}
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/* Check whether there is record in ERST */
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int apei_check_mce(void)
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{
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return erst_get_record_count();
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}
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int apei_clear_mce(u64 record_id)
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{
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return erst_clear(record_id);
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}
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