path: root/drivers/gpu/drm/drm_atomic.c

/*
 * 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>
 */


#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_plane_helper.h>

/**
 * drm_atomic_state_default_release -
 * release memory initialized by drm_atomic_state_init
 * @state: atomic state
 *
 * Free all the memory allocated by drm_atomic_state_init.
 * This is useful for drivers that subclass the atomic state.
 */
void drm_atomic_state_default_release(struct drm_atomic_state *state)
{
	kfree(state->connectors);
	kfree(state->connector_states);
	kfree(state->crtcs);
	kfree(state->crtc_states);
	kfree(state->planes);
	kfree(state->plane_states);
}
EXPORT_SYMBOL(drm_atomic_state_default_release);

/**
 * drm_atomic_state_init - init new atomic state
 * @dev: DRM device
 * @state: atomic state
 *
 * Default implementation for filling in a new atomic state.
 * This is useful for drivers that subclass the atomic state.
 */
int
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
{
	/* TODO legacy paths should maybe do a better job about
	 * setting this appropriately?
	 */
	state->allow_modeset = true;

	state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);

	state->crtcs = kcalloc(dev->mode_config.num_crtc,
			       sizeof(*state->crtcs), GFP_KERNEL);
	if (!state->crtcs)
		goto fail;
	state->crtc_states = kcalloc(dev->mode_config.num_crtc,
				     sizeof(*state->crtc_states), GFP_KERNEL);
	if (!state->crtc_states)
		goto fail;
	state->planes = kcalloc(dev->mode_config.num_total_plane,
				sizeof(*state->planes), GFP_KERNEL);
	if (!state->planes)
		goto fail;
	state->plane_states = kcalloc(dev->mode_config.num_total_plane,
				      sizeof(*state->plane_states), GFP_KERNEL);
	if (!state->plane_states)
		goto fail;
	state->connectors = kcalloc(state->num_connector,
				    sizeof(*state->connectors),
				    GFP_KERNEL);
	if (!state->connectors)
		goto fail;
	state->connector_states = kcalloc(state->num_connector,
					  sizeof(*state->connector_states),
					  GFP_KERNEL);
	if (!state->connector_states)
		goto fail;

	state->dev = dev;

	DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);

	return 0;
fail:
	drm_atomic_state_default_release(state);
	return -ENOMEM;
}
EXPORT_SYMBOL(drm_atomic_state_init);

/**
 * drm_atomic_state_alloc - allocate atomic state
 * @dev: DRM device
 *
 * This allocates an empty atomic state to track updates.
 */
struct drm_atomic_state *
drm_atomic_state_alloc(struct drm_device *dev)
{
	struct drm_mode_config *config = &dev->mode_config;
	struct drm_atomic_state *state;

	if (!config->funcs->atomic_state_alloc) {
		state = kzalloc(sizeof(*state), GFP_KERNEL);
		if (!state)
			return NULL;
		if (drm_atomic_state_init(dev, state) < 0) {
			kfree(state);
			return NULL;
		}
		return state;
	}

	return config->funcs->atomic_state_alloc(dev);
}
EXPORT_SYMBOL(drm_atomic_state_alloc);

/**
 * drm_atomic_state_default_clear - clear base atomic state
 * @state: atomic state
 *
 * Default implementation for clearing atomic state.
 * This is useful for drivers that subclass the atomic state.
 */
void drm_atomic_state_default_clear(struct drm_atomic_state *state)
{
	struct drm_device *dev = state->dev;
	struct drm_mode_config *config = &dev->mode_config;
	int i;

	DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);

	for (i = 0; i < state->num_connector; i++) {
		struct drm_connector *connector = state->connectors[i];

		if (!connector)
			continue;

		/*
		 * FIXME: Async commits can race with connector unplugging and
		 * there's currently nothing that prevents cleanup up state for
		 * deleted connectors. As long as the callback doesn't look at
		 * the connector we'll be fine though, so make sure that's the
		 * case by setting all connector point