linux-kernel - Re: [PATCH V3 RESEND 0/7] coresight: trbe: Workaround Cortex-A510 erratas

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Date:   Thu, 27 Jan 2022 13:22:20 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        coresight@...ts.linaro.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 RESEND 0/7] coresight: trbe: Workaround Cortex-A510
 erratas

On Tue, Jan 25, 2022 at 07:50:30PM +0530, Anshuman Khandual wrote:
> 	This series adds three different workarounds in the TRBE driver for
> Cortex-A510 specific erratas. But first, this adds Cortex-A510 specific cpu
> part number definition in the platform. This series applies on 5.17-rc1.
> 
> Relevant errata documents can be found here.
> 
> https://developer.arm.com/documentation/SDEN2397239/900
> https://developer.arm.com/documentation/SDEN2397589/900
> 
> Changes in V3:
> 
> https://lore.kernel.org/all/1641872346-3270-1-git-send-email-anshuman.khandual@arm.com/
> 
> - Moved the comment inside trbe_needs_drain_after_disable()
> - Moved the comment inside trbe_needs_ctxt_sync_after_enable()
> 
> Changes in V2:
> 
> https://lore.kernel.org/all/1641517808-5735-1-git-send-email-anshuman.khandual@arm.com/
> 
> Accommodated most review comments from the previous version.
> 
> - Split all patches into CPU errata definition, detection and TRBE workarounds
> - s/TRBE_WORKAROUND_SYSREG_WRITE_FAILURE/TRBE_NEEDS_DRAIN_AFTER_DISABLE
> - s/TRBE_WORKAROUND_CORRUPTION_WITH_ENABLE/TRBE_NEEDS_CTXT_SYNC_AFTER_ENABLE
> - s/trbe_may_fail_sysreg_write()/trbe_needs_drain_after_disable()
> - s/trbe_may_corrupt_with_enable()/trbe_needs_ctxt_sync_after_enable()
> - Updated Kconfig help message for config ARM64_ERRATUM_1902691
> - Updated error message for trbe_is_broken() detection
> - Added new trblimitr parameter to set_trbe_enabled(), improving performance
> - Added COMPILE_TEST dependency in the errata, until TRBE part is available
> 
> Changes in V1:
> 
> https://lore.kernel.org/lkml/1641359159-22726-1-git-send-email-anshuman.khandual@arm.com/
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Suzuki Poulose <suzuki.poulose@....com>
> Cc: coresight@...ts.linaro.org
> Cc: linux-doc@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> 
> Anshuman Khandual (7):
>   arm64: Add Cortex-A510 CPU part definition
>   arm64: errata: Add detection for TRBE ignored system register writes
>   arm64: errata: Add detection for TRBE invalid prohibited states
>   arm64: errata: Add detection for TRBE trace data corruption
>   coresight: trbe: Work around the ignored system register writes
>   coresight: trbe: Work around the invalid prohibited states
>   coresight: trbe: Work around the trace data corruption
> 
>  Documentation/arm64/silicon-errata.rst       |   6 +
>  arch/arm64/Kconfig                           |  59 ++++++++++
>  arch/arm64/include/asm/cputype.h             |   2 +
>  arch/arm64/kernel/cpu_errata.c               |  27 +++++
>  arch/arm64/tools/cpucaps                     |   3 +
>  drivers/hwtracing/coresight/coresight-trbe.c | 114 ++++++++++++++-----
>  drivers/hwtracing/coresight/coresight-trbe.h |   8 --
>  7 files changed, 183 insertions(+), 36 deletions(-)

I have applied this set and sent a pull request to Catalin for the arm64
portion.

Thanks,
Mathieu

> 
> -- 
> 2.25.1
>