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 <linux/sync_file.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_mode.h>
#include <drm/drm_print.h>
#include <drm/drm_writeback.h>

#include "drm_crtc_internal.h"
#include "drm_internal.h"

void __drm_crtc_commit_free(struct kref *kref)
{
	struct drm_crtc_commit *commit =
		container_of(kref, struct drm_crtc_commit, ref);

	kfree(commit);
}
EXPORT_SYMBOL(__drm_crtc_commit_free);

/**
 * 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 should only be used by drivers which are still subclassing
 * &drm_atomic_state and haven't switched to &drm_private_state yet.
 */
void drm_atomic_state_default_release(struct drm_atomic_state *state)
{
	kfree(state->connectors);
	kfree(state->crtcs);
	kfree(state->planes);
	kfree(state->private_objs);
}
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 should only be used by drivers which are still subclassing
 * &drm_atomic_state and haven't switched to &drm_private_state yet.
 */
int
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
{
	kref_init(&state->ref);

	/* TODO legacy paths should maybe do a better job about
	 * setting this appropriately?
	 */
	state->allow_modeset = true;

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

	if (!config->funcs->atomic_state_alloc) {
		struct drm_atomic_state *state;

		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 should only be used by drivers which are still subclassing
 * &drm_atomic_state and haven't switched to &drm_private_state yet.
 */
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].ptr;

		if (!connector)
			continue;

		connector->funcs->atomic_destroy_state(connector,
						       state->connectors[i].state);
		state->connectors[i].ptr = NULL;
		state->connectors[i].state = NULL;
		state->connectors[i].old_state = NULL;
		state->connectors[i].new_state = NULL;
		drm_connector_put(connector);
	}

	for (i = 0; i < config->num_crtc; i++) {
		struct drm_crtc *crtc = state->crtcs[i].ptr;

		if (!crtc)
			continue;

		crtc->funcs->atomic_destroy_state(crtc,
						  state->crtcs[i].state);

		state->crtcs[i].ptr = NULL;
		state->crtcs[i].state = NULL;
		state->crtcs[i].old_state = NULL;
		state->crtcs[i].new_state = NULL;

		if (state->crtcs[i].commit) {
			drm_crtc_commit_put(state->crtcs[i].commit);
			state->crtcs[i].commit = NULL;
		}
	}

	for (i = 0; i < config->num_total_plane; i++) {
		struct drm_plane *plane = state->planes[i].ptr;

		if (!plane)
			continue;

		plane->funcs->atomic_destroy_state(plane,
						   state->planes[i].state);
		state->planes[i].ptr = NULL;
		state->planes[i].state = NULL;
		state->planes[i].old_state = NULL;
		state->planes[i].new_state = NULL;
	}

	for (i = 0; i < state->num_private_objs; i++) {
		struct drm_private_obj *obj = state->private_objs[i].ptr;

		obj->funcs->atomic_destroy_state(obj,
						 state->private_objs[i].state);
		state->private_objs[i].ptr = NULL;
		state->private_objs[i].state = NULL;
		state->private_objs[i].old_state = NULL;
		state->private_objs[i].new_state = NULL;
	}
	state->num_private_objs = 0;

	if (state->fake_commit) {
		drm_crtc_commit_put(state->fake_commit);
		state->fake_commit = NULL;
	}
}
EXPORT_SYMBOL(drm_atomic_state_default_clear);

/**
 * drm_atomic_state_clear - clear state object
 * @state: atomic state
 *
 * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 * all locks. So someone else could sneak in and change the current modeset
 * configuration. Which means that all the state assembled in @state is no
 * longer an atomic update to the current state, but to some arbitrary earlier
 * state. Which could break assumptions the driver's
 * &drm_mode_config_funcs.atomic_check likely relies on.
 *
 * Hence we must clear all cached state and completely start over, using this
 * function.
 */
void drm_atomic_state_clear(struct drm_atomic_state *state)
{
	struct drm_device *dev = state->dev;
	struct drm_mode_config *config = &dev->mode_config;

	if (config->funcs->atomic_state_clear)
		config->funcs->atomic_state_clear(state);
	else
		drm_atomic_st