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pstore: X86 platform interface using ACPI/APEI/ERST

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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@intel.com>
This commit is contained in:
Tony Luck 2011-01-03 14:22:11 -08:00
parent ca01d6dd2d
commit 0bb77c465f
2 changed files with 137 additions and 0 deletions
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1
drivers/acpi/apei/Kconfig
View File

@ -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)

136
drivers/acpi/apei/erst.c
View File

@ -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 +782,128 @@ 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);
skip:
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);
if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0)
goto skip;
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 +911,7 @@ 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 +978,18 @@ 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");