Subject: Re: [PATCH v5 02/14] coresight: cti: Add sysfs coresight mgmt reg access.

From: Mathieu Poirier <[email-masked]>
Date: Fri, 22 Nov 2019 10:19:50 -0700

On Tue, Nov 19, 2019 at 11:19:00PM +0000, Mike Leach wrote:
> Adds sysfs access to the coresight management registers.
> 
> Reviewed-by: Mathieu Poirier <[email-masked]>
> Reviewed-by: Suzuki K Poulose <[email-masked]>
> Signed-off-by: Mike Leach <[email-masked]>

Tags added to a patch are like a chain of custody and should be added in order
they were published.  In this case you wrote the patch so your SoB goes first.
Then Suzuki and I have reviewed your patch and as such, our RB come _after_ your
SoB.  When I add the patch to my tree I'll add my SoB after that and when Greg
picks it up in his, he will do the same.  Please re-order the tags in this patch
and the other ones in this set to reflect the chronology of events.

> ---
>  .../hwtracing/coresight/coresight-cti-sysfs.c | 53 +++++++++++++++++++
>  drivers/hwtracing/coresight/coresight-priv.h  |  1 +
>  2 files changed, 54 insertions(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> index a832b8c6b866..507f8eb487fe 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> @@ -62,11 +62,64 @@ static struct attribute *coresight_cti_attrs[] = {
>  	NULL,
>  };
>  
> +/* register based attributes */
> +
> +/* macro to access RO registers with power check only (no enable check). */
> +#define coresight_cti_reg(name, offset)			\
> +static ssize_t name##_show(struct device *dev,				\
> +			   struct device_attribute *attr, char *buf)	\
> +{									\
> +	struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);	\
> +	u32 val = 0;							\
> +	pm_runtime_get_sync(dev->parent);				\
> +	spin_lock(&drvdata->spinlock);					\
> +	if (drvdata->config.hw_powered)					\
> +		val = readl_relaxed(drvdata->base + offset);		\
> +	spin_unlock(&drvdata->spinlock);				\
> +	pm_runtime_put_sync(dev->parent);				\
> +	return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);		\
> +}									\
> +static DEVICE_ATTR_RO(name)
> +
> +/* coresight management registers */
> +coresight_cti_reg(devaff0, CTIDEVAFF0);
> +coresight_cti_reg(devaff1, CTIDEVAFF1);
> +coresight_cti_reg(authstatus, CORESIGHT_AUTHSTATUS);
> +coresight_cti_reg(devarch, CORESIGHT_DEVARCH);
> +coresight_cti_reg(devid, CORESIGHT_DEVID);
> +coresight_cti_reg(devtype, CORESIGHT_DEVTYPE);
> +coresight_cti_reg(pidr0, CORESIGHT_PERIPHIDR0);
> +coresight_cti_reg(pidr1, CORESIGHT_PERIPHIDR1);
> +coresight_cti_reg(pidr2, CORESIGHT_PERIPHIDR2);
> +coresight_cti_reg(pidr3, CORESIGHT_PERIPHIDR3);
> +coresight_cti_reg(pidr4, CORESIGHT_PERIPHIDR4);
> +
> +static struct attribute *coresight_cti_mgmt_attrs[] = {
> +	&dev_attr_devaff0.attr,
> +	&dev_attr_devaff1.attr,
> +	&dev_attr_authstatus.attr,
> +	&dev_attr_devarch.attr,
> +	&dev_attr_devid.attr,
> +	&dev_attr_devtype.attr,
> +	&dev_attr_pidr0.attr,
> +	&dev_attr_pidr1.attr,
> +	&dev_attr_pidr2.attr,
> +	&dev_attr_pidr3.attr,
> +	&dev_attr_pidr4.attr,
> +	NULL,
> +};
> +
>  static const struct attribute_group coresight_cti_group = {
>  	.attrs = coresight_cti_attrs,
>  };
>  
> +static const struct attribute_group coresight_cti_mgmt_group = {
> +	.attrs = coresight_cti_mgmt_attrs,
> +	.name = "mgmt",
> +};
> +
>  const struct attribute_group *coresight_cti_groups[] = {
>  	&coresight_cti_group,
> +	&coresight_cti_mgmt_group,
>  	NULL,
>  };
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 82e563cdc879..aba6b789c969 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -22,6 +22,7 @@
>  #define CORESIGHT_CLAIMCLR	0xfa4
>  #define CORESIGHT_LAR		0xfb0
>  #define CORESIGHT_LSR		0xfb4
> +#define CORESIGHT_DEVARCH	0xfbc
>  #define CORESIGHT_AUTHSTATUS	0xfb8
>  #define CORESIGHT_DEVID		0xfc8
>  #define CORESIGHT_DEVTYPE	0xfcc
> -- 
> 2.17.1
> 

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