linux

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James Morse af02933d59 arm64: acpi: Make apei_claim_sea() synchronise with APEI's irq work

[ Upstream commit 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 ]

APEI is unable to do all of its error handling work in nmi-context, so
it defers non-fatal work onto the irq_work queue. arch_irq_work_raise()
sends an IPI to the calling cpu, but this is not guaranteed to be taken
before returning to user-space.

Unless the exception interrupted a context with irqs-masked,
irq_work_run() can run immediately. Otherwise return -EINPROGRESS to
indicate ghes_notify_sea() found some work to do, but it hasn't
finished yet.

With this apei_claim_sea() returning '0' means this external-abort was
also notification of a firmware-first RAS error, and that APEI has
processed the CPER records.

Signed-off-by: James Morse <james.morse@arm.com>
Tested-by: Tyler Baicar <baicar@os.amperecomputing.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-10-01 13:18:02 +02:00

cache.S

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

2019-06-19 17:09:07 +02:00

context.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

2019-06-19 17:09:07 +02:00

copypage.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

2019-06-19 17:09:07 +02:00

dma-mapping.c

arm64: use asm-generic/dma-mapping.h