diff options
author | Huang Ying <ying.huang@intel.com> | 2011-02-21 13:54:41 +0800 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2011-03-21 22:59:06 -0400 |
commit | 885b976fada5bc6595a9fd3e67e3cb1a3d11f50b (patch) | |
tree | 8b598bd3b265c0bbe8237e129410fdc80fe7847a /include/linux/aer.h | |
parent | dd9c1549edef02290edced639f67b54a25abbe0e (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/linux/aer.h')
0 files changed, 0 insertions, 0 deletions