linux-kernel - Re: [RFC PATCH 07/14] coresight: etm4x: Always read the registers on the host CPU

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Date:   Thu, 30 Jul 2020 13:56:38 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mike.leach@...aro.org, coresight@...ts.linaro.org
Subject: Re: [RFC PATCH 07/14] coresight: etm4x: Always read the registers on
 the host CPU

On Wed, Jul 22, 2020 at 06:20:33PM +0100, Suzuki K Poulose wrote:
> As we are about to add support for sysreg access to ETM4.4+ components,
> make sure that we read the registers only on the host CPU.
> 
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---

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

>  .../coresight/coresight-etm4x-sysfs.c         | 23 ++++++++-----------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index b673e738bc9a..90c75ba31a0c 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -2341,23 +2341,20 @@ static u32 etmv4_cross_read(const struct device *dev, u32 offset)
>  	return reg.data;
>  }
>  
> -#define coresight_etm4x_reg(name, offset)			\
> -	coresight_simple_reg32(struct etmv4_drvdata, name, offset)
> -
>  #define coresight_etm4x_cross_read(name, offset)			\
>  	coresight_simple_func(struct etmv4_drvdata, etmv4_cross_read,	\
>  			      name, offset)
>  
> -coresight_etm4x_reg(trcpdcr, TRCPDCR);
> -coresight_etm4x_reg(trcpdsr, TRCPDSR);
> -coresight_etm4x_reg(trclsr, TRCLSR);
> -coresight_etm4x_reg(trcauthstatus, TRCAUTHSTATUS);
> -coresight_etm4x_reg(trcdevid, TRCDEVID);
> -coresight_etm4x_reg(trcdevtype, TRCDEVTYPE);
> -coresight_etm4x_reg(trcpidr0, TRCPIDR0);
> -coresight_etm4x_reg(trcpidr1, TRCPIDR1);
> -coresight_etm4x_reg(trcpidr2, TRCPIDR2);
> -coresight_etm4x_reg(trcpidr3, TRCPIDR3);
> +coresight_etm4x_cross_read(trcpdcr, TRCPDCR);
> +coresight_etm4x_cross_read(trcpdsr, TRCPDSR);
> +coresight_etm4x_cross_read(trclsr, TRCLSR);
> +coresight_etm4x_cross_read(trcauthstatus, TRCAUTHSTATUS);
> +coresight_etm4x_cross_read(trcdevid, TRCDEVID);
> +coresight_etm4x_cross_read(trcdevtype, TRCDEVTYPE);
> +coresight_etm4x_cross_read(trcpidr0, TRCPIDR0);
> +coresight_etm4x_cross_read(trcpidr1, TRCPIDR1);
> +coresight_etm4x_cross_read(trcpidr2, TRCPIDR2);
> +coresight_etm4x_cross_read(trcpidr3, TRCPIDR3);
>  coresight_etm4x_cross_read(trcoslsr, TRCOSLSR);
>  coresight_etm4x_cross_read(trcconfig, TRCCONFIGR);
>  coresight_etm4x_cross_read(trctraceid, TRCTRACEIDR);
> -- 
> 2.24.1
>