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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
/*
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* apei.h - ACPI Platform Error Interface
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*/
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#ifndef ACPI_APEI_H
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#define ACPI_APEI_H
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#include <linux/acpi.h>
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#include <linux/cper.h>
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#include <asm/ioctls.h>
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#define APEI_ERST_INVALID_RECORD_ID 0xffffffffffffffffULL
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#define APEI_ERST_CLEAR_RECORD _IOW('E', 1, u64)
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#define APEI_ERST_GET_RECORD_COUNT _IOR('E', 2, u32)
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#ifdef __KERNEL__
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extern int hest_disable;
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extern int erst_disable;
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#ifdef CONFIG_ACPI_APEI
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void __init acpi_hest_init(void);
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#else
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static inline void acpi_hest_init(void) { return; }
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#endif
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typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
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int apei_hest_parse(apei_hest_func_t func, void *data);
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int erst_write(const struct cper_record_header *record);
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ssize_t erst_get_record_count(void);
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int erst_get_record_id_begin(int *pos);
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int erst_get_record_id_next(int *pos, u64 *record_id);
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void erst_get_record_id_end(void);
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ssize_t erst_read(u64 record_id, struct cper_record_header *record,
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size_t buflen);
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int erst_clear(u64 record_id);
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#endif
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#endif
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