Re: [PATCH v4 4/4] drm/panthor: add sysfs knob for enabling job profiling

[Steven Price <steven.price@arm.com>]

On 16/07/2024 21:11, Adrián Larumbe wrote:
> This commit introduces a DRM device sysfs attribute that lets UM control
> the job accounting status in the device. The knob variable had been brought
> in as part of a previous commit, but now we're able to fix it manually.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>

Reviewed-by: Steven Price <steven.price@arm.com>

Although we should probably copy/paste
Documentation/ABI/testing/sysfs-driver-panfrost-profiling - or at least
mention somewhere that the same knob is available for panthor.

Steve

> ---
>  drivers/gpu/drm/panthor/panthor_drv.c | 36 +++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 6a0c1a06a709..a2876310856f 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -1448,6 +1448,41 @@ static void panthor_remove(struct platform_device *pdev)
>  	panthor_device_unplug(ptdev);
>  }
>  
> +static ssize_t profiling_show(struct device *dev,
> +			      struct device_attribute *attr,
> +			      char *buf)
> +{
> +	struct panthor_device *ptdev = dev_get_drvdata(dev);
> +
> +	return sysfs_emit(buf, "%d\n", ptdev->profile_mode);
> +}
> +
> +static ssize_t profiling_store(struct device *dev,
> +			       struct device_attribute *attr,
> +			       const char *buf, size_t len)
> +{
> +	struct panthor_device *ptdev = dev_get_drvdata(dev);
> +	bool value;
> +	int err;
> +
> +	err = kstrtobool(buf, &value);
> +	if (err)
> +		return err;
> +
> +	ptdev->profile_mode = value;
> +
> +	return len;
> +}
> +
> +static DEVICE_ATTR_RW(profiling);
> +
> +static struct attribute *panthor_attrs[] = {
> +	&dev_attr_profiling.attr,
> +	NULL,
> +};
> +
> +ATTRIBUTE_GROUPS(panthor);
> +
>  static const struct of_device_id dt_match[] = {
>  	{ .compatible = "rockchip,rk3588-mali" },
>  	{ .compatible = "arm,mali-valhall-csf" },
> @@ -1467,6 +1502,7 @@ static struct platform_driver panthor_driver = {
>  		.name = "panthor",
>  		.pm = pm_ptr(&panthor_pm_ops),
>  		.of_match_table = dt_match,
> +		.dev_groups = panthor_groups,
>  	},
>  };
>