linux-kernel - Re: [PATCH V1 0/6] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64

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Message-ID: <20160210174454.GS1052@arm.com>
Date:	Wed, 10 Feb 2016 17:44:55 +0000
From:	Will Deacon <will.deacon@....com>
To:	Tyler Baicar <tbaicar@...eaurora.org>
Cc:	fu.wei@...aro.org, timur@...eaurora.org, harba@...eaurora.org,
	rruigrok@...eaurora.org, ahs3@...hat.com,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-efi@...r.kernel.org,
	devel@...ica.org
Subject: Re: [PATCH V1 0/6] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64

On Fri, Feb 05, 2016 at 12:13:22PM -0700, Tyler Baicar wrote:
> Add support for Generic Hardware Error Source (GHES) v2, which introduces the
> capability for the OS to acknowledge the consumption of the error record
> generated by the Reliability, Availability and Serviceability (RAS) controller.
> This eliminates potential race conditions between the OS and the RAS controller.
> 
> Add support for the timestamp field added to the Generic Error Data Entry v3,
> allowing the OS to log the time that the error is generated by the firmware,
> rather than the time the error is consumed. This improves the correctness of
> event sequences when analyzing error logs. The timestamp is added in
> ACPI 6.1, reference Table 18-343 Generic Error Data Entry.
> 
> Add support for ARMv8 Common Platform Error Record (CPER) per UEFI 2.6
> specification. ARMv8 specific processor error information is reported as part of
> the CPER records.  This provides more detail on for processor error logs.
> 
> Synchronous External Abort (SEA) represents a specific processor error condition
> in ARM systems. A handler is added to recognize SEA errors, and a notifier is
> added to parse and report the errors before the process is killed. Refer to
> section N.2.1.1 in the Common Platform Error Record appendix of the UEFI 2.6
> specification.
> 
> Depends on: [PATCH v5] acpi, apei, arm64: APEI initial support for aarch64.
>             https://lkml.org/lkml/2015/12/10/131

Did the TLB flushing issue ever get sorted out with that series?

http://marc.info/?l=linux-arm-kernel&m=145009373307418&w=2

It doesn't affect arm64, but I think it's a real issue for x86 when local
invalidation is in effect to avoid IPIs from interrupt context.

Will