[Intel-gfx] [PATCH 01/10] drm: crc: Introduce verify_crc_source callback

[Daniel Vetter]

On Fri, Jun 22, 2018 at 04:11:25PM +0530, Mahesh Kumar wrote:
> This patch adds a new callback function "verify_crc_source" which will
> be used during setting the crc source in control node and while opening
> data node for crc reading. This will help in avoiding setting of wrong
> string for source.
> 
> Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>

drm core patches must be cc'ed to dri-devel. simplest way to do that and
never forget is to add a Cc: line to the commit message.
-Daniel

> ---
>  drivers/gpu/drm/drm_debugfs_crc.c | 15 +++++++++++++++
>  include/drm/drm_crtc.h            | 15 +++++++++++++++
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
> index 9f8312137cad..c6a725b79ac6 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -87,6 +87,8 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
>  	struct drm_crtc *crtc = m->private;
>  	struct drm_crtc_crc *crc = &crtc->crc;
>  	char *source;
> +	size_t values_cnt;
> +	int ret = 0;
>  
>  	if (len == 0)
>  		return 0;
> @@ -104,6 +106,12 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
>  	if (source[len] == '\n')
>  		source[len] = '\0';
>  
> +	if (crtc->funcs->verify_crc_source) {
> +		ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	spin_lock_irq(&crc->lock);
>  
>  	if (crc->opened) {
> @@ -167,6 +175,13 @@ static int crtc_crc_open(struct inode *inode, struct file *filep)
>  			return ret;
>  	}
>  
> +	if (crtc->funcs->verify_crc_source) {
> +		ret = crtc->funcs->verify_crc_source(crtc, crc->source,
> +						     &values_cnt);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	spin_lock_irq(&crc->lock);
>  	if (!crc->opened)
>  		crc->opened = true;
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 23eddbccab10..1a6dcbf91744 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -661,6 +661,21 @@ struct drm_crtc_funcs {
>  	 */
>  	int (*set_crc_source)(struct drm_crtc *crtc, const char *source,
>  			      size_t *values_cnt);
> +	/**
> +	 * @verify_crc_source:
> +	 *
> +	 * verifies the source of CRC checksums of frames before setting the
> +	 * source for CRC and during crc open.
> +	 *
> +	 * This callback is optional if the driver does not support any CRC
> +	 * generation functionality.
> +	 *
> +	 * RETURNS:
> +	 *
> +	 * 0 on success or a negative error code on failure.
> +	 */
> +	int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
> +				 size_t *values_cnt);
>  
>  	/**
>  	 * @atomic_print_state:
> -- 
> 2.16.2
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch