linux-kernel - Re: [PATCHv3] coresight: tmc: Add shutdown callback for TMC ETR

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Message-ID: <7bfbef95a0ec59fd45b101ea05a9ce36@codeaurora.org>
Date:   Wed, 24 Jun 2020 12:23:24 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCHv3] coresight: tmc: Add shutdown callback for TMC ETR

On 2020-06-23 22:55, Mathieu Poirier wrote:
> On Tue, Jun 16, 2020 at 10:26:23AM +0530, Sai Prakash Ranjan wrote:
>> Implement a shutdown callback to ensure ETR hardware is
>> properly shutdown in reboot/shutdown path. This is required
>> for ETR which has SMMU address translation enabled like on
>> SC7180 SoC and few others. If the hardware is still accessing
>> memory after SMMU translation is disabled as part of SMMU
>> shutdown callback in system reboot or shutdown path, then
>> IOVAs(I/O virtual address) which it was using will go on the
>> bus as the physical addresses which might result in unknown
>> crashes (NoC/interconnect errors). So we make sure from this
>> shutdown callback that the ETR is shutdown before SMMU translation
>> is disabled and device_link in SMMU driver will take care of
>> ordering of shutdown callbacks such that SMMU shutdown callback
>> is not called before any of its consumer shutdown callbacks.
>> 
>> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
>> ---
> 
> I have applied your patch.
> 

Thanks Mathieu.

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