linux-kernel - Re: [PATCH v4 18/25] coresight: etm4x: Expose trcdevarch via trcidr

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Date:   Mon, 30 Nov 2020 15:42:14 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, mike.leach@...aro.org,
        linux-kernel@...r.kernel.org, anshuman.khandual@....com,
        jonathan.zhouwen@...wei.com, coresight@...ts.linaro.org
Subject: Re: [PATCH v4 18/25] coresight: etm4x: Expose trcdevarch via trcidr

On Thu, Nov 19, 2020 at 04:45:40PM +0000, Suzuki K Poulose wrote:
> Expose the TRCDEVARCH register via the sysfs for component
> detection. Given that the TRCIDR1 may not completely identify
> the ETM component and instead need to use TRCDEVARCH, expose
> this via sysfs for tools to use it for identification.
> 
> Cc: Mike Leach <mike.leach@...aro.org>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 ++
>  1 file changed, 2 insertions(+)

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index 009818675928..277fd5bff811 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -2395,6 +2395,7 @@ coresight_etm4x_cross_read(trcidr10, TRCIDR10);
>  coresight_etm4x_cross_read(trcidr11, TRCIDR11);
>  coresight_etm4x_cross_read(trcidr12, TRCIDR12);
>  coresight_etm4x_cross_read(trcidr13, TRCIDR13);
> +coresight_etm4x_cross_read(trcdevarch, TRCDEVARCH);
>  
>  static struct attribute *coresight_etmv4_trcidr_attrs[] = {
>  	&dev_attr_trcidr0.attr,
> @@ -2410,6 +2411,7 @@ static struct attribute *coresight_etmv4_trcidr_attrs[] = {
>  	&dev_attr_trcidr11.attr,
>  	&dev_attr_trcidr12.attr,
>  	&dev_attr_trcidr13.attr,
> +	&dev_attr_trcdevarch.attr,
>  	NULL,
>  };
>  
> -- 
> 2.24.1
>