summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/cpu
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/cpu')
-rw-r--r--arch/x86/kernel/cpu/mcheck/Makefile2
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-apei.c138
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-internal.h23
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c79
4 files changed, 231 insertions, 11 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/Makefile b/arch/x86/kernel/cpu/mcheck/Makefile
index 4ac6d48fe11..bb34b03af25 100644
--- a/arch/x86/kernel/cpu/mcheck/Makefile
+++ b/arch/x86/kernel/cpu/mcheck/Makefile
@@ -7,3 +7,5 @@ obj-$(CONFIG_X86_MCE_THRESHOLD) += threshold.o
obj-$(CONFIG_X86_MCE_INJECT) += mce-inject.o
obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o
+
+obj-$(CONFIG_ACPI_APEI) += mce-apei.o
diff --git a/arch/x86/kernel/cpu/mcheck/mce-apei.c b/arch/x86/kernel/cpu/mcheck/mce-apei.c
new file mode 100644
index 00000000000..745b54f9be8
--- /dev/null
+++ b/arch/x86/kernel/cpu/mcheck/mce-apei.c
@@ -0,0 +1,138 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/cper.h>
+#include <acpi/apei.h>
+#include <asm/mce.h>
+
+#include "mce-internal.h"
+
+void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err)
+{
+ struct mce m;
+
+ /* Only corrected MC is reported */
+ if (!corrected)
+ return;
+
+ mce_setup(&m);
+ m.bank = 1;
+ /* Fake a memory read corrected error with unknown channel */
+ m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | 0x9f;
+ m.addr = mem_err->physical_addr;
+ mce_log(&m);
+ mce_notify_irq();
+}
+EXPORT_SYMBOL_GPL(apei_mce_report_mem_error);
+
+#define CPER_CREATOR_MCE \
+ UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \
+ 0x64, 0x90, 0xb8, 0x9d)
+#define CPER_SECTION_TYPE_MCE \
+ UUID_LE(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_SER_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_SER_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;
+ ssize_t len;
+
+ len = erst_read_next(&rcd.hdr, sizeof(rcd));
+ if (len <= 0)
+ return len;
+ /* Can not skip other records in storage via ERST unless clear them */
+ else if (len != sizeof(rcd) ||
+ uuid_le_cmp(rcd.hdr.creator_id, CPER_CREATOR_MCE)) {
+ if (printk_ratelimit())
+ pr_warning(
+ "MCE-APEI: Can not skip the unknown record in ERST");
+ return -EIO;
+ }
+
+ memcpy(m, &rcd.mce, sizeof(*m));
+ *record_id = rcd.hdr.record_id;
+
+ return sizeof(*m);
+}
+
+/* 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);
+}
diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
index 32996f9fab6..fefcc69ee8b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
+++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
@@ -28,3 +28,26 @@ extern int mce_ser;
extern struct mce_bank *mce_banks;
+#ifdef CONFIG_ACPI_APEI
+int apei_write_mce(struct mce *m);
+ssize_t apei_read_mce(struct mce *m, u64 *record_id);
+int apei_check_mce(void);
+int apei_clear_mce(u64 record_id);
+#else
+static inline int apei_write_mce(struct mce *m)
+{
+ return -EINVAL;
+}
+static inline ssize_t apei_read_mce(struct mce *m, u64 *record_id)
+{
+ return 0;
+}
+static inline int apei_check_mce(void)
+{
+ return 0;
+}
+static inline int apei_clear_mce(u64 record_id)
+{
+ return -EINVAL;
+}
+#endif
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 7a355ddcc64..707165dbc20 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -264,7 +264,7 @@ static void wait_for_panic(void)
static void mce_panic(char *msg, struct mce *final, char *exp)
{
- int i;
+ int i, apei_err = 0;
if (!fake_panic) {
/*
@@ -287,8 +287,11 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
struct mce *m = &mcelog.entry[i];
if (!(m->status & MCI_STATUS_VAL))
continue;
- if (!(m->status & MCI_STATUS_UC))
+ if (!(m->status & MCI_STATUS_UC)) {
print_mce(m);
+ if (!apei_err)
+ apei_err = apei_write_mce(m);
+ }
}
/* Now print uncorrected but with the final one last */
for (i = 0; i < MCE_LOG_LEN; i++) {
@@ -297,11 +300,17 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
continue;
if (!(m->status & MCI_STATUS_UC))
continue;
- if (!final || memcmp(m, final, sizeof(struct mce)))
+ if (!final || memcmp(m, final, sizeof(struct mce))) {
print_mce(m);
+ if (!apei_err)
+ apei_err = apei_write_mce(m);
+ }
}
- if (final)
+ if (final) {
print_mce(final);
+ if (!apei_err)
+ apei_err = apei_write_mce(final);
+ }
if (cpu_missing)
printk(KERN_EMERG "Some CPUs didn't answer in synchronization\n");
print_mce_tail();
@@ -1493,6 +1502,43 @@ static void collect_tscs(void *data)
rdtscll(cpu_tsc[smp_processor_id()]);
}
+static int mce_apei_read_done;
+
+/* Collect MCE record of previous boot in persistent storage via APEI ERST. */
+static int __mce_read_apei(char __user **ubuf, size_t usize)
+{
+ int rc;
+ u64 record_id;
+ struct mce m;
+
+ if (usize < sizeof(struct mce))
+ return -EINVAL;
+
+ rc = apei_read_mce(&m, &record_id);
+ /* Error or no more MCE record */
+ if (rc <= 0) {
+ mce_apei_read_done = 1;
+ return rc;
+ }
+ rc = -EFAULT;
+ if (copy_to_user(*ubuf, &m, sizeof(struct mce)))
+ return rc;
+ /*
+ * In fact, we should have cleared the record after that has
+ * been flushed to the disk or sent to network in
+ * /sbin/mcelog, but we have no interface to support that now,
+ * so just clear it to avoid duplication.
+ */
+ rc = apei_clear_mce(record_id);
+ if (rc) {
+ mce_apei_read_done = 1;
+ return rc;
+ }
+ *ubuf += sizeof(struct mce);
+
+ return 0;
+}
+
static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
loff_t *off)
{
@@ -1506,15 +1552,19 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
return -ENOMEM;
mutex_lock(&mce_read_mutex);
+
+ if (!mce_apei_read_done) {
+ err = __mce_read_apei(&buf, usize);
+ if (err || buf != ubuf)
+ goto out;
+ }
+
next = rcu_dereference_check_mce(mcelog.next);
/* Only supports full reads right now */
- if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
- mutex_unlock(&mce_read_mutex);
- kfree(cpu_tsc);
-
- return -EINVAL;
- }
+ err = -EINVAL;
+ if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce))
+ goto out;
err = 0;
prev = 0;
@@ -1562,10 +1612,15 @@ timeout:
memset(&mcelog.entry[i], 0, sizeof(struct mce));
}
}
+
+ if (err)
+ err = -EFAULT;
+
+out:
mutex_unlock(&mce_read_mutex);
kfree(cpu_tsc);
- return err ? -EFAULT : buf - ubuf;
+ return err ? err : buf - ubuf;
}
static unsigned int mce_poll(struct file *file, poll_table *wait)
@@ -1573,6 +1628,8 @@ static unsigned int mce_poll(struct file *file, poll_table *wait)
poll_wait(file, &mce_wait, wait);
if (rcu_dereference_check_mce(mcelog.next))
return POLLIN | POLLRDNORM;
+ if (!mce_apei_read_done && apei_check_mce())
+ return POLLIN | POLLRDNORM;
return 0;
}