linux-kernel - Re: [PATCH v2 00/17] arm64: Self-hosted trace related errata workarounds

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Message-ID: <20211008095255.GA790@willie-the-truck>
Date:   Fri, 8 Oct 2021 10:52:56 +0100
From:   Will Deacon <will@...nel.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        maz@...nel.org, catalin.marinas@....com, mark.rutland@....com,
        james.morse@....com, anshuman.khandual@....com, leo.yan@...aro.org,
        mike.leach@...aro.org, mathieu.poirier@...aro.org,
        lcherian@...vell.com, coresight@...ts.linaro.org
Subject: Re: [PATCH v2 00/17] arm64: Self-hosted trace related errata
 workarounds

On Fri, Oct 08, 2021 at 10:25:03AM +0100, Suzuki K Poulose wrote:
> Hi Will
> 
> On 08/10/2021 08:32, Will Deacon wrote:
> > Hi Suzuki,
> > 
> > On Tue, Sep 21, 2021 at 02:41:04PM +0100, Suzuki K Poulose wrote:
> > > This series adds CPU erratum work arounds related to the self-hosted
> > > tracing. The list of affected errata handled in this series are :
> > > 
> > >   * TRBE may overwrite trace in FILL mode
> > >     - Arm Neoverse-N2	#2139208
> > >     - Cortex-A710	#211985
> > > 
> > >   * A TSB instruction may not flush the trace completely when executed
> > >     in trace prohibited region.
> > > 
> > >     - Arm Neoverse-N2	#2067961
> > >     - Cortex-A710	#2054223
> > > 
> > >   * TRBE may write to out-of-range address
> > >     - Arm Neoverse-N2	#2253138
> > >     - Cortex-A710	#2224489
> > > 
> > > The series applies on the self-hosted/trbe fixes posted here [0].
> > > A tree containing both the series is available here [1]
> > 
> > Any chance you could put the arch/arm64/ bits at the start of the series,
> > please? That way, I can queue them on their own branch which can be shared
> > with the coresight tree.
> 
> I could move the bits around. I have a question though.
> 
> Will, Catalin, Mathieu,
> 
> The workaround for these errata, at least two of them are
> in the TRBE driver patches. Are we happy with enabling the Kconfig
> entry in the kernel, without the CoreSight patches to implement the work
> around ?

I suppose you could move all the Kconfig changes into their own patch and
stick it right at the end in the Coresight tree.

Will