linux-kernel - Re: [PATCH v6 00/15] arm64: Self-hosted trace related errata workarounds

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Message-ID: <20211021085313.GA15622@willie-the-truck>
Date:   Thu, 21 Oct 2021 09:53:14 +0100
From:   Will Deacon <will@...nel.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>, catalin.marinas@....com,
        anshuman.khandual@....com, mike.leach@...aro.org,
        leo.yan@...aro.org, maz@...nel.org, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/15] arm64: Self-hosted trace related errata
 workarounds

On Wed, Oct 20, 2021 at 09:42:07AM -0600, Mathieu Poirier wrote:
> On Tue, Oct 19, 2021 at 05:31:38PM +0100, Suzuki K Poulose wrote:
> > Suzuki K Poulose (15):
> >   arm64: Add Neoverse-N2, Cortex-A710 CPU part definition
> >   arm64: errata: Add detection for TRBE overwrite in FILL mode
> >   arm64: errata: Add workaround for TSB flush failures
> >   arm64: errata: Add detection for TRBE write to out-of-range
> >   coresight: trbe: Add a helper to calculate the trace generated
> >   coresight: trbe: Add a helper to pad a given buffer area
> >   coresight: trbe: Decouple buffer base from the hardware base
> >   coresight: trbe: Allow driver to choose a different alignment
> >   coresight: trbe: Add infrastructure for Errata handling
> >   coresight: trbe: Workaround TRBE errata overwrite in FILL mode
> >   coresight: trbe: Add a helper to determine the minimum buffer size
> >   coresight: trbe: Make sure we have enough space
> >   coresight: trbe: Work around write to out of range
> >   arm64: errata: Enable workaround for TRBE overwrite in FILL mode
> >   arm64: errata: Enable TRBE workaround for write to out-of-range
> >     address
> > 
> >  Documentation/arm64/silicon-errata.rst       |  12 +
> >  arch/arm64/Kconfig                           | 111 ++++++
> >  arch/arm64/include/asm/barrier.h             |  16 +-
> >  arch/arm64/include/asm/cputype.h             |   4 +
> >  arch/arm64/kernel/cpu_errata.c               |  64 +++
> >  arch/arm64/tools/cpucaps                     |   3 +
> >  drivers/hwtracing/coresight/coresight-trbe.c | 394 +++++++++++++++++--
> >  7 files changed, 567 insertions(+), 37 deletions(-)
> 
> I have applied this set.

Mathieu -- the plan here (which we have discussed on the list [1]) is
for the first four patches to be shared with arm64. Since you've gone
ahead and applied the whole series, please can you provide me a stable
branch with the first four patches only so that I can include them in
the arm64 tree?

Failing that, I can create a branch for you to pull and apply the remaining
patches on top.

Please let me know.

Thanks,

Will

[1] https://lore.kernel.org/all/20211008073229.GB32625@willie-the-truck/