linux-kernel - Re: [PATCH 00/17] clocksource/arch_timer: Errara workaround infrastructure rework

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Date:   Mon, 20 Mar 2017 15:07:53 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Scott Wood <oss@...error.net>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Ding Tianhong <dingtianhong@...wei.com>
Subject: Re: [PATCH 00/17] clocksource/arch_timer: Errara workaround
 infrastructure rework

On Mon, Mar 06, 2017 at 11:26:05AM +0000, Marc Zyngier wrote:
> It has recently become obvious that a number of arm64 systems have
> been blessed with a set of timers that are slightly less than perfect,
> and require a bit of hand-holding. We already have a bunch of
> errata-specific code to deal with this, but as we're adding more
> potential detection methods (DT, ACPI, capability), things are getting
> a bit out of hands.
> 
> Instead of adding more ad-hoc fixes to an already difficult code base,
> let's give ourselves a bit of an infrastructure that can deal with
> this and hide most of the uggliness behind frendly accessors.

>  Documentation/arm64/silicon-errata.txt |   1 +
>  arch/arm64/include/asm/arch_timer.h    |  44 ++-
>  arch/arm64/include/asm/cpucaps.h       |   3 +-
>  arch/arm64/include/asm/cputype.h       |   2 +
>  arch/arm64/include/asm/esr.h           |   2 +
>  arch/arm64/kernel/cpu_errata.c         |  15 +
>  arch/arm64/kernel/cpufeature.c         |  13 +-
>  arch/arm64/kernel/traps.c              |  14 +
>  drivers/clocksource/Kconfig            |  11 +
>  drivers/clocksource/arm_arch_timer.c   | 529 +++++++++++++++++++++++----------
>  10 files changed, 465 insertions(+), 169 deletions(-)

Largely this looks ok.

What's the plan for merging this?

If you can respin this, I can see about collating this with the ACPI
GTDT patches, but I'm not sure what to do about the arch/arm64/ parts.

Thanks,
Mark.