forked from Minki/linux
885b976fad
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>
42 lines
1016 B
C
42 lines
1016 B
C
/*
|
|
* apei.h - ACPI Platform Error Interface
|
|
*/
|
|
|
|
#ifndef ACPI_APEI_H
|
|
#define ACPI_APEI_H
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/cper.h>
|
|
#include <asm/ioctls.h>
|
|
|
|
#define APEI_ERST_INVALID_RECORD_ID 0xffffffffffffffffULL
|
|
|
|
#define APEI_ERST_CLEAR_RECORD _IOW('E', 1, u64)
|
|
#define APEI_ERST_GET_RECORD_COUNT _IOR('E', 2, u32)
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
extern int hest_disable;
|
|
extern int erst_disable;
|
|
|
|
#ifdef CONFIG_ACPI_APEI
|
|
void __init acpi_hest_init(void);
|
|
#else
|
|
static inline void acpi_hest_init(void) { return; }
|
|
#endif
|
|
|
|
typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
|
|
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_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);
|
|
int erst_clear(u64 record_id);
|
|
|
|
#endif
|
|
#endif
|