PageRenderTime 23ms CodeModel.GetById 17ms app.highlight 4ms RepoModel.GetById 1ms app.codeStats 0ms

/arch/x86/kernel/cpu/mcheck/mce-apei.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 138 lines | 81 code | 18 blank | 39 comment | 6 complexity | 07ab19edeb59dd7bc2d43a39d18ed2d7 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * Bridge between MCE and APEI
  3 *
  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.
 10 *
 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.
 13 *
 14 * Copyright 2010 Intel Corp.
 15 *   Author: Huang Ying <ying.huang@intel.com>
 16 *
 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.
 20 *
 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.
 25 *
 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
 29 */
 30
 31#include <linux/kernel.h>
 32#include <linux/acpi.h>
 33#include <linux/cper.h>
 34#include <acpi/apei.h>
 35#include <asm/mce.h>
 36
 37#include "mce-internal.h"
 38
 39void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err)
 40{
 41	struct mce m;
 42
 43	/* Only corrected MC is reported */
 44	if (!corrected)
 45		return;
 46
 47	mce_setup(&m);
 48	m.bank = 1;
 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;
 52	mce_log(&m);
 53	mce_notify_irq();
 54}
 55EXPORT_SYMBOL_GPL(apei_mce_report_mem_error);
 56
 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)
 63
 64/*
 65 * CPER specification (in UEFI specification 2.3 appendix N) requires
 66 * byte-packed.
 67 */
 68struct cper_mce_record {
 69	struct cper_record_header hdr;
 70	struct cper_section_descriptor sec_hdr;
 71	struct mce mce;
 72} __packed;
 73
 74int apei_write_mce(struct mce *m)
 75{
 76	struct cper_mce_record rcd;
 77
 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_SER_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;
 91
 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_SER_FATAL;
100
101	memcpy(&rcd.mce, m, sizeof(*m));
102
103	return erst_write(&rcd.hdr);
104}
105
106ssize_t apei_read_mce(struct mce *m, u64 *record_id)
107{
108	struct cper_mce_record rcd;
109	ssize_t len;
110
111	len = erst_read_next(&rcd.hdr, sizeof(rcd));
112	if (len <= 0)
113		return len;
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())
118			pr_warning(
119			"MCE-APEI: Can not skip the unknown record in ERST");
120		return -EIO;
121	}
122
123	memcpy(m, &rcd.mce, sizeof(*m));
124	*record_id = rcd.hdr.record_id;
125
126	return sizeof(*m);
127}
128
129/* Check whether there is record in ERST */
130int apei_check_mce(void)
131{
132	return erst_get_record_count();
133}
134
135int apei_clear_mce(u64 record_id)
136{
137	return erst_clear(record_id);
138}