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authorHuang Ying <ying.huang@intel.com>2011-02-21 08:54:41 +0300
committerLen Brown <len.brown@intel.com>2011-03-22 05:59:06 +0300
commit885b976fada5bc6595a9fd3e67e3cb1a3d11f50b (patch)
tree8b598bd3b265c0bbe8237e129410fdc80fe7847a /include/acpi/apei.h
parentdd9c1549edef02290edced639f67b54a25abbe0e (diff)
downloadlinux-885b976fada5bc6595a9fd3e67e3cb1a3d11f50b.tar.xz
ACPI, APEI, Add ERST record ID cache
APEI ERST firmware interface and implementation has no multiple users in mind. For example, if there is four records in storage with ID: 1, 2, 3 and 4, if two ERST readers enumerate the records via GET_NEXT_RECORD_ID as follow, reader 1 reader 2 1 2 3 4 -1 -1 where -1 signals there is no more record ID. Reader 1 has no chance to check record 2 and 4, while reader 2 has no chance to check record 1 and 3. And any other GET_NEXT_RECORD_ID will return -1, that is, other readers will has no chance to check any record even they are not cleared by anyone. This makes raw GET_NEXT_RECORD_ID not suitable for used by multiple users. To solve the issue, an in-memory ERST record ID cache is designed and implemented. When enumerating record ID, the ID returned by GET_NEXT_RECORD_ID is added into cache in addition to be returned to caller. So other readers can check the cache to get all record ID available. Signed-off-by: Huang Ying <ying.huang@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/acpi/apei.h')
-rw-r--r--include/acpi/apei.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/acpi/apei.h b/include/acpi/apei.h
index c4dbb132d902..e67b523a50e1 100644
--- a/include/acpi/apei.h
+++ b/include/acpi/apei.h
@@ -30,10 +30,11 @@ int apei_hest_parse(apei_hest_func_t func, void *data);
int erst_write(const struct cper_record_header *record);
ssize_t erst_get_record_count(void);
-int erst_get_next_record_id(u64 *record_id);
+int erst_get_record_id_begin(int *pos);
+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_next(struct cper_record_header *record, size_t buflen);
int erst_clear(u64 record_id);
#endif