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authorSeiji Aguchi <seiji.aguchi@hds.com>2012-11-27 04:07:44 +0400
committerTony Luck <tony.luck@intel.com>2012-11-27 04:07:44 +0400
commit755d4fe46529018ae45bc7c86df682de45ace764 (patch)
tree470788ad3e9fa704ef41fa62ac9e770193010853 /include
parenta9efd39cd547223597cfe7c53acec44c099b9264 (diff)
downloadlinux-755d4fe46529018ae45bc7c86df682de45ace764.tar.xz
efi_pstore: Add a sequence counter to a variable name
[Issue] Currently, a variable name, which identifies each entry, consists of type, id and ctime. But if multiple events happens in a short time, a second/third event may fail to log because efi_pstore can't distinguish each event with current variable name. [Solution] A reasonable way to identify all events precisely is introducing a sequence counter to the variable name. The sequence counter has already supported in a pstore layer with "oopscount". So, this patch adds it to a variable name. Also, it is passed to read/erase callbacks of platform drivers in accordance with the modification of the variable name. <before applying this patch> a variable name of first event: dump-type0-1-12345678 a variable name of second event: dump-type0-1-12345678 type:0 id:1 ctime:12345678 If multiple events happen in a short time, efi_pstore can't distinguish them because variable names are same among them. <after applying this patch> it can be distinguishable by adding a sequence counter as follows. a variable name of first event: dump-type0-1-1-12345678 a variable name of Second event: dump-type0-1-2-12345678 type:0 id:1 sequence counter: 1(first event), 2(second event) ctime:12345678 In case of a write callback executed in pstore_console_write(), "0" is added to an argument of the write callback because it just logs all kernel messages and doesn't need to care about multiple events. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Mike Waychison <mikew@google.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pstore.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index f6e93362d259..1788909d9a99 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -50,17 +50,19 @@ struct pstore_info {
int (*open)(struct pstore_info *psi);
int (*close)(struct pstore_info *psi);
ssize_t (*read)(u64 *id, enum pstore_type_id *type,
- struct timespec *time, char **buf,
+ int *count, struct timespec *time, char **buf,
struct pstore_info *psi);
int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
- unsigned int part, size_t size, struct pstore_info *psi);
+ unsigned int part, int count, size_t size,
+ struct pstore_info *psi);
int (*write_buf)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, const char *buf, size_t size,
struct pstore_info *psi);
int (*erase)(enum pstore_type_id type, u64 id,
- struct timespec time, struct pstore_info *psi);
+ int count, struct timespec time,
+ struct pstore_info *psi);
void *data;
};