Re: [PATCH v2 5/9] coresight-tpdm: Add nodes to set trigger timestamp and type

[Suzuki K Poulose]

On 19/01/2023 07:41, Tao Zhang wrote:
> The nodes are needed to set or show the trigger timestamp and
> trigger type. This change is to add these nodes to achieve these
> function.
>
> Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
> Signed-off-by: Tao Zhang <taozha@xxxxxxxxxxxxxxxx>
> ---
>   drivers/hwtracing/coresight/coresight-tpdm.c | 97 ++++++++++++++++++++++++++++
>   1 file changed, 97 insertions(+)
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index c29d667d..1dbb6c4 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -20,6 +20,22 @@
>   
>   DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>   
> +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
> +							struct attribute *attr, int n)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	if (drvdata) {
> +		if (drvdata->datasets & TPDM_PIDR0_DS_DSB)
> +			return attr->mode;
> +		else
> +			return 0;
> +	}

	if (drvdata && drvdata->dsb)
		return attr->mode;

	return 0;

?


> +
> +	return 0;
> +}
> +
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
>   	u32 val;
> @@ -241,8 +257,89 @@ static struct attribute_group tpdm_attr_grp = {
>   	.attrs = tpdm_attrs,
>   };
>   
> +static ssize_t dsb_trig_type_show(struct device *dev,
> +				     struct device_attribute *attr,
> +				     char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	return sysfs_emit(buf, "%u\n",
> +			 (unsigned int)drvdata->dsb->trig_type);
> +}
> +
> +/*
> + * value 0: set trigger type as enablement
> + * value 1: set trigger type as disablement
> + */
> +static ssize_t dsb_trig_type_store(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf,
> +				      size_t size)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	unsigned long val;
> +
> +	if ((kstrtoul(buf, 0, &val)) || val < 0 || val > 1)

val < 0 check here doesn't help on an unsigned variable.

may be (val & ~1UL) ?

> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	if (val)
> +		drvdata->dsb->trig_type = true;
> +	else
> +		drvdata->dsb->trig_type = false;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_trig_type);
> +
> +static ssize_t dsb_trig_ts_show(struct device *dev,
> +				     struct device_attribute *attr,
> +				     char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	return sysfs_emit(buf, "%u\n",
> +			 (unsigned int)drvdata->dsb->trig_ts);
> +}
> +
> +/*
> + * value 0: set trigger timestamp as enablement
> + * value 1: set trigger timestamp as disablement
> + */
> +static ssize_t dsb_trig_ts_store(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf,
> +				      size_t size)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	unsigned long val;
> +
> +	if ((kstrtoul(buf, 0, &val)) || val < 0 || val > 1)

same here.

> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	if (val)
> +		drvdata->dsb->trig_ts = true;
> +	else
> +		drvdata->dsb->trig_ts = false;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_trig_ts);
> +static struct attribute *tpdm_dsb_attrs[] = {
> +	&dev_attr_dsb_trig_ts.attr,
> +	&dev_attr_dsb_trig_type.attr,
> +	NULL,
> +};
> +
> +static struct attribute_group tpdm_dsb_attr_grp = {
> +	.attrs = tpdm_dsb_attrs,
> +	.is_visible = tpdm_dsb_is_visible,
> +};
> +
>   static const struct attribute_group *tpdm_attr_grps[] = {
>   	&tpdm_attr_grp,
> +	&tpdm_dsb_attr_grp,
>   	NULL,
>   };

Suzuki