/* SPDX-License-Identifier: GPL-2.0 *//* * (C) COPYRIGHT 2016 ARM Limited. All rights reserved. * Author: Brian Starkey <brian.starkey@arm.com> * * This program is free software and is provided to you under the terms of the * GNU General Public License version 2 as published by the Free Software * Foundation, and any use by you of this program is subject to the terms * of such GNU licence. */ #ifndef __DRM_WRITEBACK_H__#define __DRM_WRITEBACK_H__#include <drm/drm_connector.h>#include <drm/drm_encoder.h>#include <linux/workqueue.h> struct drm_writeback_connector {	struct drm_connector base; 	/**	 * @encoder: Internal encoder used by the connector to fulfill	 * the DRM framework requirements. The users of the	 * @drm_writeback_connector control the behaviour of the @encoder	 * by passing the @enc_funcs parameter to drm_writeback_connector_init()	 * function.	 */	struct drm_encoder encoder; 	/**	 * @pixel_formats_blob_ptr:	 *	 * DRM blob property data for the pixel formats list on writeback	 * connectors	 * See also drm_writeback_connector_init()	 */	struct drm_property_blob *pixel_formats_blob_ptr; 	/** @job_lock: Protects job_queue */	spinlock_t job_lock; 	/**	 * @job_queue:	 *	 * Holds a list of a connector's writeback jobs; the last item is the	 * most recent. The first item may be either waiting for the hardware	 * to begin writing, or currently being written.	 *	 * See also: drm_writeback_queue_job() and	 * drm_writeback_signal_completion()	 */	struct list_head job_queue; 	/**	 * @fence_context:	 *	 * timeline context used for fence operations.	 */	unsigned int fence_context;	/**	 * @fence_lock:	 *	 * spinlock to protect the fences in the fence_context.	 */	spinlock_t fence_lock;	/**	 * @fence_seqno:	 *	 * Seqno variable used as monotonic counter for the fences	 * created on the connector's timeline.	 */	unsigned long fence_seqno;	/**	 * @timeline_name:	 *	 * The name of the connector's fence timeline.	 */	char timeline_name[32];}; struct drm_writeback_job {	/**	 * @cleanup_work:	 *	 * Used to allow drm_writeback_signal_completion to defer dropping the	 * framebuffer reference to a workqueue	 */	struct work_struct cleanup_work; 	/**	 * @list_entry:	 *	 * List item for the writeback connector's @job_queue	 */	struct list_head list_entry; 	/**	 * @fb:	 *	 * Framebuffer to be written to by the writeback connector. Do not set	 * directly, use drm_atomic_set_writeback_fb_for_connector()	 */	struct drm_framebuffer *fb; 	/**	 * @out_fence:	 *	 * Fence which will signal once the writeback has completed	 */	struct dma_fence *out_fence;}; static inline struct drm_writeback_connector *drm_connector_to_writeback(struct drm_connector *connector){	return container_of(connector, struct drm_writeback_connector, base);} int drm_writeback_connector_init(struct drm_device *dev,				 struct drm_writeback_connector *wb_connector,				 const struct drm_connector_funcs *con_funcs,				 const struct drm_encoder_helper_funcs *enc_helper_funcs,				 const u32 *formats, int n_formats); void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,			     struct drm_writeback_job *job); void drm_writeback_cleanup_job(struct drm_writeback_job *job); voiddrm_writeback_signal_completion(struct drm_writeback_connector *wb_connector,				int status); struct dma_fence *drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector);#endif