]> git.baikalelectronics.ru Git - kernel.git/commit
arm64: kernel: Prepare for a DISR user
authorJames Morse <james.morse@arm.com>
Mon, 15 Jan 2018 19:38:59 +0000 (19:38 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Tue, 16 Jan 2018 15:07:12 +0000 (15:07 +0000)
commit8f26ccf05848e871aaac5865493b80c9834d3726
tree07f56625a64473270c90dcfc8c74589540b81e96
parent464827f776f3d7405a9d11f70290c4f383b81735
arm64: kernel: Prepare for a DISR user

KVM would like to consume any pending SError (or RAS error) after guest
exit. Today it has to unmask SError and use dsb+isb to synchronise the
CPU. With the RAS extensions we can use ESB to synchronise any pending
SError.

Add the necessary macros to allow DISR to be read and converted to an
ESR.

We clear the DISR register when we enable the RAS cpufeature, and the
kernel has not executed any ESB instructions. Any value we find in DISR
must have belonged to firmware. Executing an ESB instruction is the
only way to update DISR, so we can expect firmware to have handled
any deferred SError. By the same logic we clear DISR in the idle path.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/include/asm/assembler.h
arch/arm64/include/asm/esr.h
arch/arm64/include/asm/exception.h
arch/arm64/include/asm/processor.h
arch/arm64/include/asm/sysreg.h
arch/arm64/kernel/cpufeature.c
arch/arm64/mm/proc.S