[PATCH v6 4/8] drm: writeback: Introduce cleanup function

[Maxime Ripard]

On Mon, Dec 30, 2024 at 07:37:34PM +0100, Louis Chauvet wrote:
> Currently there is no cleanup function for writeback connectors. To allows
> implementation of drmm variant of writeback connector, create a cleanup
> function that can be used to properly remove all the writeback-specific
> properties and allocations.
> 
> This also introduce an helper to cleanup only the drm_writeback_connector
> properties, so it can be used during initialization to cleanup in case of
> failure.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
> ---
>  drivers/gpu/drm/drm_writeback.c | 43 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
> index 33a3c98a962d1ec49ac4b353902036cf74290ae6..c274cba257cde5f4b446df3854974e690c60bf7b 100644
> --- a/drivers/gpu/drm/drm_writeback.c
> +++ b/drivers/gpu/drm/drm_writeback.c
> @@ -15,6 +15,7 @@
>  #include <drm/drm_device.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_framebuffer.h>
> +#include <drm/drm_managed.h>
>  #include <drm/drm_modeset_helper_vtables.h>
>  #include <drm/drm_property.h>
>  #include <drm/drm_writeback.h>
> @@ -140,6 +141,22 @@ static int create_writeback_properties(struct drm_device *dev)
>  	return 0;
>  }
>  
> +static void delete_writeback_properties(struct drm_device *dev)
> +{
> +	if (dev->mode_config.writeback_pixel_formats_property) {
> +		drm_property_destroy(dev, dev->mode_config.writeback_pixel_formats_property);
> +		dev->mode_config.writeback_pixel_formats_property = NULL;
> +	}
> +	if (dev->mode_config.writeback_out_fence_ptr_property) {
> +		drm_property_destroy(dev, dev->mode_config.writeback_out_fence_ptr_property);
> +		dev->mode_config.writeback_out_fence_ptr_property = NULL;
> +	}
> +	if (dev->mode_config.writeback_fb_id_property) {
> +		drm_property_destroy(dev, dev->mode_config.writeback_fb_id_property);
> +		dev->mode_config.writeback_fb_id_property = NULL;
> +	}
> +}
> +
>  static const struct drm_encoder_funcs drm_writeback_encoder_funcs = {
>  	.destroy = drm_encoder_cleanup,
>  };
> @@ -284,6 +301,32 @@ int drm_writeback_connector_init_with_encoder(struct drm_device *dev,
>  }
>  EXPORT_SYMBOL(drm_writeback_connector_init_with_encoder);
>  
> +/**
> + * drm_writeback_connector_cleanup - Cleanup the writeback connector
> + * @dev: DRM device
> + * @wb_connector: Pointer to the writeback connector to clean up
> + *
> + * This will decrement the reference counter of blobs and destroy properties. It
> + * will also clean the remaining jobs in this writeback connector. Caution: This helper will not
> + * clean up the attached encoder and the drm_connector.
> + */
> +static void drm_writeback_connector_cleanup(struct drm_device *dev,
> +					    struct drm_writeback_connector *wb_connector)
> +{
> +	unsigned long flags;
> +	struct drm_writeback_job *pos, *n;
> +
> +	delete_writeback_properties(dev);
> +	drm_property_blob_put(wb_connector->pixel_formats_blob_ptr);
> +
> +	spin_lock_irqsave(&wb_connector->job_lock, flags);
> +	list_for_each_entry_safe(pos, n, &wb_connector->job_queue, list_entry) {
> +		drm_writeback_cleanup_job(pos);
> +		list_del(&pos->list_entry);
> +	}
> +	spin_unlock_irqrestore(&wb_connector->job_lock, flags);
> +}
> +

Given that this function is static now, it should be merged with the
patch using it.

Maxime
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