path: root/include/drm/drm_atomic.h

/*
 * Copyright (C) 2014 Red Hat
 * Copyright (C) 2014 Intel Corp.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 * Rob Clark <robdclark@gmail.com>
 * Daniel Vetter <daniel.vetter@ffwll.ch>
 */

#ifndef DRM_ATOMIC_H_
#define DRM_ATOMIC_H_

#include <drm/drm_crtc.h>
#include <drm/drm_util.h>

/**
 * struct drm_crtc_commit - track modeset commits on a CRTC
 *
 * This structure is used to track pending modeset changes and atomic commit on
 * a per-CRTC basis. Since updating the list should never block, this structure
 * is reference counted to allow waiters to safely wait on an event to complete,
 * without holding any locks.
 *
 * It has 3 different events in total to allow a fine-grained synchronization
 * between outstanding updates::
 *
 *	atomic commit thread			hardware
 *
 * 	write new state into hardware	---->	...
 * 	signal hw_done
 * 						switch to new state on next
 * 	...					v/hblank
 *
 *	wait for buffers to show up		...
 *
 *	...					send completion irq
 *						irq handler signals flip_done
 *	cleanup old buffers
 *
 * 	signal cleanup_done
 *
 * 	wait for flip_done		<----
 * 	clean up atomic state
 *
 * The important bit to know is that &cleanup_done is the terminal event, but the
 * ordering between &flip_done and &hw_done is entirely up to the specific driver
 * and modeset state change.
 *
 * For an implementation of how to use this look at
 * drm_atomic_helper_setup_commit() from the atomic helper library.
 *
 * See also drm_crtc_commit_wait().
 */
struct drm_crtc_commit {
	/**
	 * @crtc:
	 *
	 * DRM CRTC for this commit.
	 */
	struct drm_crtc *crtc;

	/**
	 * @ref:
	 *
	 * Reference count for this structure. Needed to allow blocking on
	 * completions without the risk of the completion disappearing
	 * meanwhile.
	 */
	struct kref ref;

	/**
	 * @flip_done:
	 *
	 * Will be signaled when the hardware has flipped to the new set of
	 * buffers. Signals at the same time as when the drm event for this
	 * commit is sent to userspace, or when an out-fence is singalled. Note
	 * that for most hardware, in most cases this happens after @hw_done is
	 * signalled.
	 *
	 * Completion of this stage is signalled implicitly by calling
	 * drm_crtc_send_vblank_event() on &drm_crtc_state.event.
	 */
	struct completion flip_done;

	/**
	 * @hw_done:
	 *
	 * Will be signalled when all hw register changes for this commit have
	 * been written out. Especially when disabling a pipe this can be much
	 * later than @flip_done, since that can signal already when the
	 * screen goes black, whereas to fully shut down a pipe more register
	 * I/O is required.
	 *
	 * Note that this does not need to include separately reference-counted
	 * resources like backing storage buffer pinning, or runtime pm
	 * management.
	 *
	 * Drivers should call drm_atomic_helper_commit_hw_done() to signal
	 * completion of this stage.
	 */
	struct completion hw_done;

	/**
	 * @cleanup_done:
	 *
	 * Will be signalled after old buffers have been cleaned up by calling
	 * drm_atomic_helper_cleanup_planes(). Since this can only happen after
	 * a vblank wait completed it might be a bit later. This completion is
	 * useful to throttle updates and avoid hardware updates getting ahead
	 * of the buffer cleanup too much.
	 *
	 * Drivers should call drm_atomic_helper_commit_cleanup_done() to signal
	 * completion of this stage.
	 */
	struct completion cleanup_done;

	/**
	 * @commit_entry:
	 *
	 * Entry on the per-CRTC &drm_crtc.commit_list. Protected by
	 * $drm_crtc.commit_lock.
	 */
	struct list_head commit_entry;

	/**
	 * @event:
	 *
	 * &drm_pending_vblank_event pointer to clean up private events.
	 */
	struct drm_pending_vblank_event *event;

	/**
	 * @abort_completion:
	 *
	 * A flag that's set after drm_atomic_helper_setup_commit() takes a
	 * second reference for the completion of $drm_crtc_state.event. It's
	 * used by the free code to remove the second reference if commit fails.
	 */
	bool abort_completion;
};

struct __drm_planes_state {
	struct drm_plane *ptr;
	struct drm_plane_state *state, *old_state, *new_state;
};

struct __drm_crtcs_state {
	struct drm_crtc *ptr;
	struct drm_crtc_state *state, *old_state, *new_state;

	/**
	 * @commit:
	 *
	 * A reference to the CRTC commit object that is kept for use by
	 * drm_atomic_helper_wait_for_flip_done() after
	 * drm_atomic_helper_commit_hw_done() is called. This ensures that a
	 * concurrent commit won't free a commit object that is still in use.
	 */
	struct drm_crtc_commit *commit;

	s32 __user *out_fence_ptr;
	u64 last_vblank_count;
};

struct __drm_connnectors_state {
	struct drm_connector *ptr;
	struct drm_connector_state *state, *old_state, *new_state;
	/**
	 * @out_fence_ptr:
	 *
	 * User-provided pointer which the kernel uses to return a sync_file
	 * file descriptor. Used by writeback connectors to signal completion of
	 * the writeback.
	 */
	s32 __user *out_fence_ptr;
};

struct drm_private_obj;
struct drm_private_state;

/**
 * struct drm_private_state_funcs - atomic state functions for private objects
 *
 * These hooks are used by atomic helpers to create, swap and destroy states of
 * private objects. The structure itself is used as a vtable to identify the
 * associated private object type. Each private object type that needs to b