The 'error record serialization table' in ACPI provides a suitable
amount of persistent storage for use by the pstore filesystem.
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index fca34cc..e91680c 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -1,5 +1,6 @@
config ACPI_APEI
bool "ACPI Platform Error Interface (APEI)"
+ select PSTORE
depends on X86
help
APEI allows to report errors (for example from the chipset)
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 5850d32..f54cab6 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -34,6 +34,7 @@
#include <linux/cper.h>
#include <linux/nmi.h>
#include <linux/hardirq.h>
+#include <linux/pstore.h>
#include <acpi/apei.h>
#include "apei-internal.h"
@@ -781,6 +782,125 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
return 0;
}
+static size_t erst_reader(u64 *id, enum pstore_type_id *type,
+ struct timespec *time);
+static u64 erst_writer(enum pstore_type_id type, size_t size);
+
+static struct pstore_info erst_info = {
+ .owner = THIS_MODULE,
+ .name = "erst",
+ .read = erst_reader,
+ .write = erst_writer,
+ .erase = erst_clear
+};
+
+#define CPER_CREATOR_PSTORE \
+ UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \
+ 0x64, 0x90, 0xb8, 0x9d)
+#define CPER_SECTION_TYPE_DMESG \
+ UUID_LE(0xc197e04e, 0xd545, 0x4a70, 0x9c, 0x17, 0xa5, 0x54, \
+ 0x94, 0x19, 0xeb, 0x12)
+#define CPER_SECTION_TYPE_MCE \
+ UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \
+ 0x04, 0x4a, 0x38, 0xfc)
+
+struct cper_pstore_record {
+ struct cper_record_header hdr;
+ struct cper_section_descriptor sec_hdr;
+ char data[];
+} __packed;
+
+static size_t erst_reader(u64 *id, enum pstore_type_id *type,
+ struct timespec *time)
+{
+ int rc;
+ ssize_t len;
+ unsigned long flags;
+ u64 record_id;
+ struct cper_pstore_record *rcd = (struct cper_pstore_record *)
+ (erst_info.buf - sizeof(*rcd));
+
+ if (erst_disable)
+ return -ENODEV;
+
+ raw_spin_lock_irqsave(&erst_lock, flags);
+ rc = __erst_get_next_record_id(&record_id);
+ if (rc) {
+ raw_spin_unlock_irqrestore(&erst_lock, flags);
+ return rc;
+ }
+ /* no more record */
+ if (record_id == APEI_ERST_INVALID_RECORD_ID) {
+ raw_spin_unlock_irqrestore(&erst_lock, flags);
+ return 0;
+ }
+
+ len = __erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
+ erst_erange.size);
+ raw_spin_unlock_irqrestore(&erst_lock, flags);
+
+ *id = record_id;
+ if (uuid_le_cmp(rcd->sec_hdr.section_type,
+ CPER_SECTION_TYPE_DMESG) == 0)
+ *type = PSTORE_TYPE_DMESG;
+ else if (uuid_le_cmp(rcd->sec_hdr.section_type,
+ CPER_SECTION_TYPE_MCE) == 0)
+ *type = PSTORE_TYPE_MCE;
+ else
+ *type = PSTORE_TYPE_UNKNOWN;
+
+ if (rcd->hdr.validation_bits & CPER_VALID_TIMESTAMP)
+ time->tv_sec = rcd->hdr.timestamp;
+ else
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+
+ return len - sizeof(*rcd);
+}
+
+static u64 erst_writer(enum pstore_type_id type, size_t size)
+{
+ struct cper_pstore_record *rcd = (struct cper_pstore_record *)
+ (erst_info.buf - sizeof(*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 valid. platform_id, partition_id are invalid */
+ rcd->hdr.validation_bits = CPER_VALID_TIMESTAMP;
+ rcd->hdr.timestamp = get_seconds();
+ rcd->hdr.record_length = sizeof(*rcd) + size;
+ rcd->hdr.creator_id = CPER_CREATOR_PSTORE;
+ 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 = sizeof(*rcd);
+ rcd->sec_hdr.section_length = size;
+ 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;
+ switch (type) {
+ case PSTORE_TYPE_DMESG:
+ rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG;
+ break;
+ case PSTORE_TYPE_MCE:
+ rcd->sec_hdr.section_type = CPER_SECTION_TYPE_MCE;
+ break;
+ default:
+ return -EINVAL;
+ }
+ rcd->sec_hdr.section_severity = CPER_SEV_FATAL;
+
+ erst_write(&rcd->hdr);
+
+ return rcd->hdr.record_id;
+}
+
static int __init erst_init(void)
{
int rc = 0;
@@ -788,6 +908,7 @@ static int __init erst_init(void)
struct apei_exec_context ctx;
struct apei_resources erst_resources;
struct resource *r;
+ char *buf;
if (acpi_disabled)
goto err;
@@ -854,6 +975,18 @@ static int __init erst_init(void)
if (!erst_erange.vaddr)
goto err_release_erange;
+ buf = kmalloc(erst_erange.size, GFP_KERNEL);
+ mutex_init(&erst_info.buf_mutex);
+ if (buf) {
+ erst_info.buf = buf + sizeof(struct cper_pstore_record);
+ erst_info.bufsize = erst_erange.size -
+ sizeof(struct cper_pstore_record);
+ if (pstore_register(&erst_info)) {
+ pr_info(ERST_PFX "Could not register with persistent store\n");
+ kfree(buf);
+ }
+ }
+
pr_info(ERST_PFX
"Error Record Serialization Table (ERST) support is initialized.\n");
--
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