linux-kernel - Re: [PATCH 02/15] coresight: Make ETM4x TRCIDR2 register accesses consistent with sysreg.h

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Date:   Thu, 3 Feb 2022 14:27:29 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     James Clark <james.clark@....com>, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org
Cc:     leo.yan@...aro.com, mike.leach@...aro.org,
        Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/15] coresight: Make ETM4x TRCIDR2 register accesses
 consistent with sysreg.h

On 02/02/2022 16:02, James Clark wrote:
> This is a no-op change for style and consistency and has no effect on the
> binary produced by gcc-11.
> 
> Signed-off-by: James Clark <james.clark@....com>


> ---
>   drivers/hwtracing/coresight/coresight-etm4x-core.c | 6 +++---
>   drivers/hwtracing/coresight/coresight-etm4x.h      | 7 +++++++
>   2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 8aefee4e72fd..4abe5444234e 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1111,11 +1111,11 @@ static void etm4_init_arch_data(void *info)
>   	/* maximum size of resources */
>   	etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
>   	/* CIDSIZE, bits[9:5] Indicates the Context ID size */
> -	drvdata->ctxid_size = BMVAL(etmidr2, 5, 9);
> +	drvdata->ctxid_size = REG_VAL(etmidr2, TRCIDR2_CIDSIZE);
>   	/* VMIDSIZE, bits[14:10] Indicates the VMID size */
> -	drvdata->vmid_size = BMVAL(etmidr2, 10, 14);
> +	drvdata->vmid_size = REG_VAL(etmidr2, TRCIDR2_VMIDSIZE);
>   	/* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */
> -	drvdata->ccsize = BMVAL(etmidr2, 25, 28);
> +	drvdata->ccsize = REG_VAL(etmidr2, TRCIDR2_CCSIZE);
>   
>   	etmidr3 = etm4x_relaxed_read32(csa, TRCIDR3);
>   	/* CCITMIN, bits[11:0] minimum threshold value that can be programmed */
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 2bd8ad953b8e..a95df5686b4b 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -147,6 +147,13 @@
>   #define TRCIDR0_TSSIZE_SHIFT			24
>   #define TRCIDR0_TSSIZE_MASK			GENMASK(4, 0)
>   
> +#define TRCIDR2_CIDSIZE_SHIFT			5
> +#define TRCIDR2_CIDSIZE_MASK			GENMASK(4, 0)
> +#define TRCIDR2_VMIDSIZE_SHIFT			10
> +#define TRCIDR2_VMIDSIZE_MASK			GENMASK(4, 0)
> +#define TRCIDR2_CCSIZE_SHIFT			25
> +#define TRCIDR2_CCSIZE_MASK			GENMASK(3, 0)
> +

Looks good to me. I have confirmed the above changes matches the spec.

Suzuki