Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (27 commits)
  ACPI: Don't let acpi_pad needlessly mark TSC unstable
  drivers/acpi/sleep.h: Checkpatch cleanup
  ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion
  ACPI: delete unused c-state promotion/demotion data strucutures
  ACPI: video: fix acpi_backlight=video
  ACPI: EC: Use kmemdup
  drivers/acpi: use kasprintf
  ACPI, APEI, EINJ injection parameters support
  Add x64 support to debugfs
  ACPI, APEI, Use ERST for persistent storage of MCE
  ACPI, APEI, Error Record Serialization Table (ERST) support
  ACPI, APEI, Generic Hardware Error Source memory error support
  ACPI, APEI, UEFI Common Platform Error Record (CPER) header
  Unified UUID/GUID definition
  ACPI Hardware Error Device (PNP0C33) support
  ACPI, APEI, PCIE AER, use general HEST table parsing in AER firmware_first setup
  ACPI, APEI, Document for APEI
  ACPI, APEI, EINJ support
  ACPI, APEI, HEST table parsing
  ACPI, APEI, APEI supporting infrastructure
  ...

4 files changed, 231 insertions, 11 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/Makefile b/arch/x86/kernel/cpu/mcheck/Makefile
index 4ac6d48fe11b..bb34b03af252 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 000000000000..745b54f9be89
--- /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 32996f9fab67..fefcc69ee8b5 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 7a355ddcc64b..707165dbc203 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;
 }