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ACPI: APEI: Fix missing ERST record id

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Read a record is cleared by others, but the deleted record cache entry is
still created by erst_get_record_id_next. When next enumerate the records,
get the cached deleted record, then erst_read() return -ENOENT and try to
get next record, loop back to first ID will return 0 in function
__erst_record_id_cache_add_one and then set record_id as
APEI_ERST_INVALID_RECORD_ID, finished this time read operation.
It will result in read the records just in the cache hereafter.

This patch cleared the deleted record cache, fix the issue that
"./erst-inject -p" shows record counts not equal to "./erst-inject -n".

A reproducer of the problem(retry many times):

[root@localhost erst-inject]# ./erst-inject -c 0xaaaaa00011
[root@localhost erst-inject]# ./erst-inject -p
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00012
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00013
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00014
[root@localhost erst-inject]# ./erst-inject -i 0xaaaaa000006
[root@localhost erst-inject]# ./erst-inject -i 0xaaaaa000007
[root@localhost erst-inject]# ./erst-inject -i 0xaaaaa000008
[root@localhost erst-inject]# ./erst-inject -p
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00012
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00013
rc: 273
rcd sig: CPER
rcd id: 0xaaaaa00014
[root@localhost erst-inject]# ./erst-inject -n
total error record count: 6

Signed-off-by: Liu Xinpeng <liuxp11@chinatelecom.cn>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Liu Xinpeng 2022-04-12 11:05:19 +08:00 committed by Rafael J. Wysocki
parent ce522ba9ef
commit a090931524
4 changed files with 78 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/kernel/cpu/mce/apei.c
View File

@ -177,16 +177,14 @@ ssize_t apei_read_mce(struct mce *m, u64 *record_id)
/* no more record */
if (*record_id == APEI_ERST_INVALID_RECORD_ID)
goto out;
rc = erst_read(*record_id, &rcd.hdr, sizeof(rcd));
rc = erst_read_record(*record_id, &rcd.hdr, sizeof(rcd), sizeof(rcd),
&CPER_CREATOR_MCE);
/* someone else has cleared the record, try next one */
if (rc == -ENOENT)
goto retry;
else if (rc < 0)
goto out;
/* try to skip other type records in storage */
else if (rc != sizeof(rcd) ||
!guid_equal(&rcd.hdr.creator_id, &CPER_CREATOR_MCE))
goto retry;
memcpy(m, &rcd.mce, sizeof(*m));
rc = sizeof(*m);
out:

3
drivers/acpi/apei/erst-dbg.c
View File

@ -111,7 +111,8 @@ static ssize_t erst_dbg_read(struct file *filp, char __user *ubuf,
goto out;
}
retry:
rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len);
rc = len = erst_read_record(id, erst_dbg_buf, erst_dbg_buf_len,
erst_dbg_buf_len, NULL);
/* The record may be cleared by others, try read next record */
if (rc == -ENOENT)
goto retry_next;

77
drivers/acpi/apei/erst.c
View File

@ -856,6 +856,74 @@ ssize_t erst_read(u64 record_id, struct cper_record_header *record,
}
EXPORT_SYMBOL_GPL(erst_read);
static void erst_clear_cache(u64 record_id)
{
int i;
u64 *entries;
mutex_lock(&erst_record_id_cache.lock);
entries = erst_record_id_cache.entries;
for (i = 0; i < erst_record_id_cache.len; i++) {
if (entries[i] == record_id)
entries[i] = APEI_ERST_INVALID_RECORD_ID;
}
__erst_record_id_cache_compact();
mutex_unlock(&erst_record_id_cache.lock);
}
ssize_t erst_read_record(u64 record_id, struct cper_record_header *record,
size_t buflen, size_t recordlen, const guid_t *creatorid)
{
ssize_t len;
/*
* if creatorid is NULL, read any record for erst-dbg module
*/
if (creatorid == NULL) {
len = erst_read(record_id, record, buflen);
if (len == -ENOENT)
erst_clear_cache(record_id);
return len;
}
len = erst_read(record_id, record, buflen);
/*
* if erst_read return value is -ENOENT skip to next record_id,
* and clear the record_id cache.
*/
if (len == -ENOENT) {
erst_clear_cache(record_id);
goto out;
}
if (len < 0)
goto out;
/*
* if erst_read return value is less than record head length,
* consider it as -EIO, and clear the record_id cache.
*/
if (len < recordlen) {
len = -EIO;
erst_clear_cache(record_id);
goto out;
}
/*
* if creatorid is not wanted, consider it as not found,
* for skipping to next record_id.
*/
if (!guid_equal(&record->creator_id, creatorid))
len = -ENOENT;
out:
return len;
}
EXPORT_SYMBOL_GPL(erst_read_record);
int erst_clear(u64 record_id)
{
int rc, i;
@ -996,16 +1064,13 @@ static ssize_t erst_reader(struct pstore_record *record)
goto out;
}
len = erst_read(record_id, &rcd->hdr, rcd_len);
len = erst_read_record(record_id, &rcd->hdr, rcd_len, sizeof(*rcd),
&CPER_CREATOR_PSTORE);
/* The record may be cleared by others, try read next record */
if (len == -ENOENT)
goto skip;
else if (len < 0 || len < sizeof(*rcd)) {
rc = -EIO;
else if (len < 0)
goto out;
}
if (!guid_equal(&rcd->hdr.creator_id, &CPER_CREATOR_PSTORE))
goto skip;
record->buf = kmalloc(len, GFP_KERNEL);
if (record->buf == NULL) {

2
include/acpi/apei.h
View File

@ -46,6 +46,8 @@ int erst_get_record_id_next(int *pos, u64 *record_id);
void erst_get_record_id_end(void);
ssize_t erst_read(u64 record_id, struct cper_record_header *record,
size_t buflen);
ssize_t erst_read_record(u64 record_id, struct cper_record_header *record,
size_t buflen, size_t recordlen, const guid_t *creatorid);
int erst_clear(u64 record_id);
int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data);