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acpi: apei: read ack upon ghes record consumption

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A RAS (Reliability, Availability, Serviceability) controller
may be a separate processor running in parallel with OS
execution, and may generate error records for consumption by
the OS. If the RAS controller produces multiple error records,
then they may be overwritten before the OS has consumed them.

The Generic Hardware Error Source (GHES) v2 structure
introduces the capability for the OS to acknowledge the
consumption of the error record generated by the RAS
controller. A RAS controller supporting GHESv2 shall wait for
the acknowledgment before writing a new error record, thus
eliminating the race condition.

Add support for parsing of GHESv2 sub-tables as well.

Signed-off-by: Tyler Baicar <[email protected]>
CC: Jonathan (Zhixiong) Zhang <[email protected]>
Reviewed-by: James Morse <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Tyler Baicar 2017-06-21 12:17:04 -06:00 • committed by Will Deacon
commit 42aa560446
3 changed files with 65 additions and 6 deletions
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5
include/acpi/ghes.h
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@ -13,7 +13,10 @@
#define GHES_EXITING 0x0002
struct ghes {
struct acpi_hest_generic *generic;
union {
struct acpi_hest_generic *generic;
struct acpi_hest_generic_v2 *generic_v2;
};
struct acpi_hest_generic_status *estatus;
u64 buffer_paddr;
unsigned long flags;