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authorHuang Ying <ying.huang@intel.com>2011-02-21 00:54:41 -0500
committerLen Brown <len.brown@intel.com>2011-03-21 22:59:06 -0400
commit885b976fada5bc6595a9fd3e67e3cb1a3d11f50b (patch)
tree8b598bd3b265c0bbe8237e129410fdc80fe7847a /include/acpi
parentdd9c1549edef02290edced639f67b54a25abbe0e (diff)
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')
-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);
30 30
31int erst_write(const struct cper_record_header *record); 31int erst_write(const struct cper_record_header *record);
32ssize_t erst_get_record_count(void); 32ssize_t erst_get_record_count(void);
33int erst_get_next_record_id(u64 *record_id); 33int erst_get_record_id_begin(int *pos);
34int erst_get_record_id_next(int *pos, u64 *record_id);
35void erst_get_record_id_end(void);
34ssize_t erst_read(u64 record_id, struct cper_record_header *record, 36ssize_t erst_read(u64 record_id, struct cper_record_header *record,
35 size_t buflen); 37 size_t buflen);
36ssize_t erst_read_next(struct cper_record_header *record, size_t buflen);
37int erst_clear(u64 record_id); 38int erst_clear(u64 record_id);
38 39
39#endif 40#endif