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/*

 * 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 

 * Daniel Vetter 

 */

#include 

#include 

#include 

#include 

/**

 * 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->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->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 || !connector->funcs)

			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 pointers to NULL.

		 */

		state->connector_states[i]->connector = NULL;

		connector->funcs->atomic_destroy_state(NULL,

						       state->connector_states[i]);

		state->connectors[i] = NULL;

		state->connector_states[i] = NULL;

	}

	for (i = 0; i < config->num_crtc; i++) {

		struct drm_crtc *crtc = state->crtcs[i];

		if (!crtc)

			continue;

		crtc->funcs->atomic_destroy_state(crtc,

						  state->crtc_states[i]);

		state->crtcs[i] = NULL;

		state->crtc_states[i] = NULL;

	}

	for (i = 0; i < config->num_total_plane; i++) {

		struct drm_plane *plane = state->planes[i];

		if (!plane)

			continue;

		plane->funcs->atomic_destroy_state(plane,

						   state->plane_states[i]);

		state->planes[i] = NULL;

		state->plane_states[i] = 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 ->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_state_default_clear(state);

}

EXPORT_SYMBOL(drm_atomic_state_clear);

/**

 * drm_atomic_state_free - free all memory for an atomic state

 * @state: atomic state to deallocate

 *

 * This frees all memory associated with an atomic state, including all the

 * per-object state for planes, crtcs and connectors.

 */

void drm_atomic_state_free(struct drm_atomic_state *state)

{

	struct drm_device *dev;

	struct drm_mode_config *config;

	if (!state)

		return;

	dev = state->dev;

	config = &dev->mode_config;

	drm_atomic_state_clear(state);

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

	if (config->funcs->atomic_state_free) {

		config->funcs->atomic_state_free(state);

	} else {

		drm_atomic_state_default_release(state);

		kfree(state);

	}

}

EXPORT_SYMBOL(drm_atomic_state_free);

/**

 * drm_atomic_get_crtc_state - get crtc state

 * @state: global atomic state object

 * @crtc: crtc to get state object for

 *

 * This function returns the crtc state for the given crtc, allocating it if

 * needed. It will also grab the relevant crtc lock to make sure that the state

 * is consistent.

 *

 * Returns:

 *

 * Either the allocated state or the error code encoded into the pointer. When

 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the

 * entire atomic sequence must be restarted. All other errors are fatal.

 */

struct drm_crtc_state *

drm_atomic_get_crtc_state(struct drm_atomic_state *state,

			  struct drm_crtc *crtc)

{

	int ret, index = drm_crtc_index(crtc);

	struct drm_crtc_state *crtc_state;

	crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);

	if (crtc_state)

		return crtc_state;

	ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);

	if (ret)

		return ERR_PTR(ret);

	crtc_state = crtc->funcs->atomic_duplicate_state(crtc);

	if (!crtc_state)

		return ERR_PTR(-ENOMEM);

	state->crtc_states[index] = crtc_state;

	state->crtcs[index] = crtc;

	crtc_state->state = state;

	DRM_DEBUG_ATOMIC("Added [CRTC:%d:%s] %p state to %p\n",

			 crtc->base.id, crtc->name, crtc_state, state);

	return crtc_state;

}

EXPORT_SYMBOL(drm_atomic_get_crtc_state);

/**

 * drm_atomic_set_mode_for_crtc - set mode for CRTC

 * @state: the CRTC whose incoming state to update

 * @mode: kernel-internal mode to use for the CRTC, or NULL to disable

 *

 * Set a mode (originating from the kernel) on the desired CRTC state. Does

 * not change any other state properties, including enable, active, or

 * mode_changed.

 *

 * RETURNS:

 * Zero on success, error code on failure. Cannot return -EDEADLK.

 */

int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,

				 struct drm_display_mode *mode)

{

	struct drm_mode_modeinfo umode;

	/* Early return for no change. */

	if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)

		return 0;

	drm_property_unreference_blob(state->mode_blob);

	state->mode_blob = NULL;

	if (mode) {

		drm_mode_convert_to_umode(&umode, mode);

		state->mode_blob =

			drm_property_create_blob(state->crtc->dev,

		                                 sizeof(umode),

		                                 &umode);

		if (IS_ERR(state->mode_blob))

			return PTR_ERR(state->mode_blob);

		drm_mode_copy(&state->mode, mode);

		state->enable = true;

		DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",

				 mode->name, state);

	} else {

		memset(&state->mode, 0, sizeof(state->mode));

		state->enable = false;

		DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",

				 state);

	}

	return 0;

}

EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);

/**

 * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC

 * @state: the CRTC whose incoming state to update

 * @blob: pointer to blob property to use for mode

 *

 * Set a mode (originating from a blob property) on the desired CRTC state.

 * This function will take a reference on the blob property for the CRTC state,

 * and release the reference held on the state's existing mode property, if any

 * was set.

 *

 * RETURNS:

 * Zero on success, error code on failure. Cannot return -EDEADLK.

 */

int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,

                                      struct drm_property_blob *blob)

{

	if (blob == state->mode_blob)

		return 0;

	drm_property_unreference_blob(state->mode_blob);

	state->mode_blob = NULL;

	memset(&state->mode, 0, sizeof(state->mode));

	if (blob) {

		if (blob->length != sizeof(struct drm_mode_modeinfo) ||

		    drm_mode_convert_umode(&state->mode,

		                           (const struct drm_mode_modeinfo *)

		                            blob->data))

			return -EINVAL;

		state->mode_blob = drm_property_reference_blob(blob);

		state->enable = true;

		DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",

				 state->mode.name, state);

	} else {

		state->enable = false;

		DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",

				 state);

	}

	return 0;

}

EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);

/**

 * drm_atomic_replace_property_blob - replace a blob property

 * @blob: a pointer to the member blob to be replaced

 * @new_blob: the new blob to replace with

 * @replaced: whether the blob has been replaced

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static void

drm_atomic_replace_property_blob(struct drm_property_blob **blob,

				 struct drm_property_blob *new_blob,

				 bool *replaced)

{

	struct drm_property_blob *old_blob = *blob;

	if (old_blob == new_blob)

		return;

	if (old_blob)

		drm_property_unreference_blob(old_blob);

	if (new_blob)

		drm_property_reference_blob(new_blob);

	*blob = new_blob;

	*replaced = true;

	return;

}

static int

drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,

					 struct drm_property_blob **blob,

					 uint64_t blob_id,

					 ssize_t expected_size,

					 bool *replaced)

{

	struct drm_device *dev = crtc->dev;

	struct drm_property_blob *new_blob = NULL;

	if (blob_id != 0) {

		new_blob = drm_property_lookup_blob(dev, blob_id);

		if (new_blob == NULL)

			return -EINVAL;

		if (expected_size > 0 && expected_size != new_blob->length)

			return -EINVAL;

	}

	drm_atomic_replace_property_blob(blob, new_blob, replaced);

	return 0;

}

/**

 * drm_atomic_crtc_set_property - set property on CRTC

 * @crtc: the drm CRTC to set a property on

 * @state: the state object to update with the new property value

 * @property: the property to set

 * @val: the new property value

 *

 * Use this instead of calling crtc->atomic_set_property directly.

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_set_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

int drm_atomic_crtc_set_property(struct drm_crtc *crtc,

		struct drm_crtc_state *state, struct drm_property *property,

		uint64_t val)

{

	struct drm_device *dev = crtc->dev;

	struct drm_mode_config *config = &dev->mode_config;

	bool replaced = false;

	int ret;

	if (property == config->prop_active)

		state->active = val;

	else if (property == config->prop_mode_id) {

		struct drm_property_blob *mode =

			drm_property_lookup_blob(dev, val);

		ret = drm_atomic_set_mode_prop_for_crtc(state, mode);

		drm_property_unreference_blob(mode);

		return ret;

	} else if (property == config->degamma_lut_property) {

		ret = drm_atomic_replace_property_blob_from_id(crtc,

					&state->degamma_lut,

					val,

					-1,

					&replaced);

		state->color_mgmt_changed = replaced;

		return ret;

	} else if (property == config->ctm_property) {

		ret = drm_atomic_replace_property_blob_from_id(crtc,

					&state->ctm,

					val,

					sizeof(struct drm_color_ctm),

					&replaced);

		state->color_mgmt_changed = replaced;

		return ret;

	} else if (property == config->gamma_lut_property) {

		ret = drm_atomic_replace_property_blob_from_id(crtc,

					&state->gamma_lut,

					val,

					-1,

					&replaced);

		state->color_mgmt_changed = replaced;

		return ret;

	} else if (crtc->funcs->atomic_set_property)

		return crtc->funcs->atomic_set_property(crtc, state, property, val);

	else

		return -EINVAL;

	return 0;

}

EXPORT_SYMBOL(drm_atomic_crtc_set_property);

/**

 * drm_atomic_crtc_get_property - get property value from CRTC state

 * @crtc: the drm CRTC to set a property on

 * @state: the state object to get the property value from

 * @property: the property to set

 * @val: return location for the property value

 *

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_get_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static int

drm_atomic_crtc_get_property(struct drm_crtc *crtc,

		const struct drm_crtc_state *state,

		struct drm_property *property, uint64_t *val)

{

	struct drm_device *dev = crtc->dev;

	struct drm_mode_config *config = &dev->mode_config;

	if (property == config->prop_active)

		*val = state->active;

	else if (property == config->prop_mode_id)

		*val = (state->mode_blob) ? state->mode_blob->base.id : 0;

	else if (property == config->degamma_lut_property)

		*val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;

	else if (property == config->ctm_property)

		*val = (state->ctm) ? state->ctm->base.id : 0;

	else if (property == config->gamma_lut_property)

		*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;

	else if (crtc->funcs->atomic_get_property)

		return crtc->funcs->atomic_get_property(crtc, state, property, val);

	else

		return -EINVAL;

	return 0;

}

/**

 * drm_atomic_crtc_check - check crtc state

 * @crtc: crtc to check

 * @state: crtc state to check

 *

 * Provides core sanity checks for crtc state.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static int drm_atomic_crtc_check(struct drm_crtc *crtc,

		struct drm_crtc_state *state)

{

	/* NOTE: we explicitly don't enforce constraints such as primary

	 * layer covering entire screen, since that is something we want

	 * to allow (on hw that supports it).  For hw that does not, it

	 * should be checked in driver's crtc->atomic_check() vfunc.

	 *

	 * TODO: Add generic modeset state checks once we support those.

	 */

	if (state->active && !state->enable) {

		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",

				 crtc->base.id, crtc->name);

		return -EINVAL;

	}

	/* The state->enable vs. state->mode_blob checks can be WARN_ON,

	 * as this is a kernel-internal detail that userspace should never

	 * be able to trigger. */

	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&

	    WARN_ON(state->enable && !state->mode_blob)) {

		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",

				 crtc->base.id, crtc->name);

		return -EINVAL;

	}

	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&

	    WARN_ON(!state->enable && state->mode_blob)) {

		DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",

				 crtc->base.id, crtc->name);

		return -EINVAL;

	}

	/*

	 * Reject event generation for when a CRTC is off and stays off.

	 * It wouldn't be hard to implement this, but userspace has a track

	 * record of happily burning through 100% cpu (or worse, crash) when the

	 * display pipe is suspended. To avoid all that fun just reject updates

	 * that ask for events since likely that indicates a bug in the

	 * compositor's drawing loop. This is consistent with the vblank IOCTL

	 * and legacy page_flip IOCTL which also reject service on a disabled

	 * pipe.

	 */

	if (state->event && !state->active && !crtc->state->active) {

		DRM_DEBUG_ATOMIC("[CRTC:%d] requesting event but off\n",

				 crtc->base.id);

		return -EINVAL;

	}

	return 0;

}

/**

 * drm_atomic_get_plane_state - get plane state

 * @state: global atomic state object

 * @plane: plane to get state object for

 *

 * This function returns the plane state for the given plane, allocating it if

 * needed. It will also grab the relevant plane lock to make sure that the state

 * is consistent.

 *

 * Returns:

 *

 * Either the allocated state or the error code encoded into the pointer. When

 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the

 * entire atomic sequence must be restarted. All other errors are fatal.

 */

struct drm_plane_state *

drm_atomic_get_plane_state(struct drm_atomic_state *state,

			  struct drm_plane *plane)

{

	int ret, index = drm_plane_index(plane);

	struct drm_plane_state *plane_state;

	plane_state = drm_atomic_get_existing_plane_state(state, plane);

	if (plane_state)

		return plane_state;

	ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);

	if (ret)

		return ERR_PTR(ret);

	plane_state = plane->funcs->atomic_duplicate_state(plane);

	if (!plane_state)

		return ERR_PTR(-ENOMEM);

	state->plane_states[index] = plane_state;

	state->planes[index] = plane;

	plane_state->state = state;

	DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",

			 plane->base.id, plane->name, plane_state, state);

	if (plane_state->crtc) {

		struct drm_crtc_state *crtc_state;

		crtc_state = drm_atomic_get_crtc_state(state,

						       plane_state->crtc);

		if (IS_ERR(crtc_state))

			return ERR_CAST(crtc_state);

	}

	return plane_state;

}

EXPORT_SYMBOL(drm_atomic_get_plane_state);

/**

 * drm_atomic_plane_set_property - set property on plane

 * @plane: the drm plane to set a property on

 * @state: the state object to update with the new property value

 * @property: the property to set

 * @val: the new property value

 *

 * Use this instead of calling plane->atomic_set_property directly.

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_set_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

int drm_atomic_plane_set_property(struct drm_plane *plane,

		struct drm_plane_state *state, struct drm_property *property,

		uint64_t val)

{

	struct drm_device *dev = plane->dev;

	struct drm_mode_config *config = &dev->mode_config;

	if (property == config->prop_fb_id) {

		struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);

		drm_atomic_set_fb_for_plane(state, fb);

		if (fb)

			drm_framebuffer_unreference(fb);

	} else if (property == config->prop_crtc_id) {

		struct drm_crtc *crtc = drm_crtc_find(dev, val);

		return drm_atomic_set_crtc_for_plane(state, crtc);

	} else if (property == config->prop_crtc_x) {

		state->crtc_x = U642I64(val);

	} else if (property == config->prop_crtc_y) {

		state->crtc_y = U642I64(val);

	} else if (property == config->prop_crtc_w) {

		state->crtc_w = val;

	} else if (property == config->prop_crtc_h) {

		state->crtc_h = val;

	} else if (property == config->prop_src_x) {

		state->src_x = val;

	} else if (property == config->prop_src_y) {

		state->src_y = val;

	} else if (property == config->prop_src_w) {

		state->src_w = val;

	} else if (property == config->prop_src_h) {

		state->src_h = val;

	} else if (property == config->rotation_property) {

		state->rotation = val;

	} else if (plane->funcs->atomic_set_property) {

		return plane->funcs->atomic_set_property(plane, state,

				property, val);

	} else {

		return -EINVAL;

	}

	return 0;

}

EXPORT_SYMBOL(drm_atomic_plane_set_property);

/**

 * drm_atomic_plane_get_property - get property value from plane state

 * @plane: the drm plane to set a property on

 * @state: the state object to get the property value from

 * @property: the property to set

 * @val: return location for the property value

 *

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_get_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static int

drm_atomic_plane_get_property(struct drm_plane *plane,

		const struct drm_plane_state *state,

		struct drm_property *property, uint64_t *val)

{

	struct drm_device *dev = plane->dev;

	struct drm_mode_config *config = &dev->mode_config;

	if (property == config->prop_fb_id) {

		*val = (state->fb) ? state->fb->base.id : 0;

	} else if (property == config->prop_crtc_id) {

		*val = (state->crtc) ? state->crtc->base.id : 0;

	} else if (property == config->prop_crtc_x) {

		*val = I642U64(state->crtc_x);

	} else if (property == config->prop_crtc_y) {

		*val = I642U64(state->crtc_y);

	} else if (property == config->prop_crtc_w) {

		*val = state->crtc_w;

	} else if (property == config->prop_crtc_h) {

		*val = state->crtc_h;

	} else if (property == config->prop_src_x) {

		*val = state->src_x;

	} else if (property == config->prop_src_y) {

		*val = state->src_y;

	} else if (property == config->prop_src_w) {

		*val = state->src_w;

	} else if (property == config->prop_src_h) {

		*val = state->src_h;

	} else if (property == config->rotation_property) {

		*val = state->rotation;

	} else if (plane->funcs->atomic_get_property) {

		return plane->funcs->atomic_get_property(plane, state, property, val);

	} else {

		return -EINVAL;

	}

	return 0;

}

static bool

plane_switching_crtc(struct drm_atomic_state *state,

		     struct drm_plane *plane,

		     struct drm_plane_state *plane_state)

{

	if (!plane->state->crtc || !plane_state->crtc)

		return false;

	if (plane->state->crtc == plane_state->crtc)

		return false;

	/* This could be refined, but currently there's no helper or driver code

	 * to implement direct switching of active planes nor userspace to take

	 * advantage of more direct plane switching without the intermediate

	 * full OFF state.

	 */

	return true;

}

/**

 * drm_atomic_plane_check - check plane state

 * @plane: plane to check

 * @state: plane state to check

 *

 * Provides core sanity checks for plane state.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static int drm_atomic_plane_check(struct drm_plane *plane,

		struct drm_plane_state *state)

{

	unsigned int fb_width, fb_height;

	int ret;

	/* either *both* CRTC and FB must be set, or neither */

	if (WARN_ON(state->crtc && !state->fb)) {

		DRM_DEBUG_ATOMIC("CRTC set but no FB\n");

		return -EINVAL;

	} else if (WARN_ON(state->fb && !state->crtc)) {

		DRM_DEBUG_ATOMIC("FB set but no CRTC\n");

		return -EINVAL;

	}

	/* if disabled, we don't care about the rest of the state: */

	if (!state->crtc)

		return 0;

	/* Check whether this plane is usable on this CRTC */

	if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {

		DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");

		return -EINVAL;

	}

	/* Check whether this plane supports the fb pixel format. */

	ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);

	if (ret) {

		DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",

				 drm_get_format_name(state->fb->pixel_format));

		return ret;

	}

	/* Give drivers some help against integer overflows */

	if (state->crtc_w > INT_MAX ||

	    state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||

	    state->crtc_h > INT_MAX ||

	    state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {

		DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",

				 state->crtc_w, state->crtc_h,

				 state->crtc_x, state->crtc_y);

		return -ERANGE;

	}

	fb_width = state->fb->width << 16;

	fb_height = state->fb->height << 16;

	/* Make sure source coordinates are inside the fb. */

	if (state->src_w > fb_width ||

	    state->src_x > fb_width - state->src_w ||

	    state->src_h > fb_height ||

	    state->src_y > fb_height - state->src_h) {

		DRM_DEBUG_ATOMIC("Invalid source coordinates "

				 "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",

				 state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,

				 state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,

				 state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,

				 state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);

		return -ENOSPC;

	}

	if (plane_switching_crtc(state->state, plane, state)) {

		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",

				 plane->base.id, plane->name);

		return -EINVAL;

	}

	return 0;

}

/**

 * drm_atomic_get_connector_state - get connector state

 * @state: global atomic state object

 * @connector: connector to get state object for

 *

 * This function returns the connector state for the given connector,

 * allocating it if needed. It will also grab the relevant connector lock to

 * make sure that the state is consistent.

 *

 * Returns:

 *

 * Either the allocated state or the error code encoded into the pointer. When

 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the

 * entire atomic sequence must be restarted. All other errors are fatal.

 */

struct drm_connector_state *

drm_atomic_get_connector_state(struct drm_atomic_state *state,

			  struct drm_connector *connector)

{

	int ret, index;

	struct drm_mode_config *config = &connector->dev->mode_config;

	struct drm_connector_state *connector_state;

	ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);

	if (ret)

		return ERR_PTR(ret);

	index = drm_connector_index(connector);

	if (index >= state->num_connector) {

		struct drm_connector **c;

		struct drm_connector_state **cs;

		int alloc = max(index + 1, config->num_connector);

		c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);

		if (!c)

			return ERR_PTR(-ENOMEM);

		state->connectors = c;

		memset(&state->connectors[state->num_connector], 0,

		       sizeof(*state->connectors) * (alloc - state->num_connector));

		cs = krealloc(state->connector_states, alloc * sizeof(*state->connector_states), GFP_KERNEL);

		if (!cs)

			return ERR_PTR(-ENOMEM);

		state->connector_states = cs;

		memset(&state->connector_states[state->num_connector], 0,

		       sizeof(*state->connector_states) * (alloc - state->num_connector));

		state->num_connector = alloc;

	}

	if (state->connector_states[index])

		return state->connector_states[index];

	connector_state = connector->funcs->atomic_duplicate_state(connector);

	if (!connector_state)

		return ERR_PTR(-ENOMEM);

	state->connector_states[index] = connector_state;

	state->connectors[index] = connector;

	connector_state->state = state;

	DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",

			 connector->base.id, connector_state, state);

	if (connector_state->crtc) {

		struct drm_crtc_state *crtc_state;

		crtc_state = drm_atomic_get_crtc_state(state,

						       connector_state->crtc);

		if (IS_ERR(crtc_state))

			return ERR_CAST(crtc_state);

	}

	return connector_state;

}

EXPORT_SYMBOL(drm_atomic_get_connector_state);

/**

 * drm_atomic_connector_set_property - set property on connector.

 * @connector: the drm connector to set a property on

 * @state: the state object to update with the new property value

 * @property: the property to set

 * @val: the new property value

 *

 * Use this instead of calling connector->atomic_set_property directly.

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_set_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

int drm_atomic_connector_set_property(struct drm_connector *connector,

		struct drm_connector_state *state, struct drm_property *property,

		uint64_t val)

{

	struct drm_device *dev = connector->dev;

	struct drm_mode_config *config = &dev->mode_config;

	if (property == config->prop_crtc_id) {

		struct drm_crtc *crtc = drm_crtc_find(dev, val);

		return drm_atomic_set_crtc_for_connector(state, crtc);

	} else if (property == config->dpms_property) {

		/* setting DPMS property requires special handling, which

		 * is done in legacy setprop path for us.  Disallow (for

		 * now?) atomic writes to DPMS property:

		 */

		return -EINVAL;

	} else if (connector->funcs->atomic_set_property) {

		return connector->funcs->atomic_set_property(connector,

				state, property, val);

	} else {

		return -EINVAL;

	}

}

EXPORT_SYMBOL(drm_atomic_connector_set_property);

/**

 * drm_atomic_connector_get_property - get property value from connector state

 * @connector: the drm connector to set a property on

 * @state: the state object to get the property value from

 * @property: the property to set

 * @val: return location for the property value

 *

 * This function handles generic/core properties and calls out to

 * driver's ->atomic_get_property() for driver properties.  To ensure

 * consistent behavior you must call this function rather than the

 * driver hook directly.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

static int

drm_atomic_connector_get_property(struct drm_connector *connector,

		const struct drm_connector_state *state,

		struct drm_property *property, uint64_t *val)

{

	struct drm_device *dev = connector->dev;

	struct drm_mode_config *config = &dev->mode_config;

	if (property == config->prop_crtc_id) {

		*val = (state->crtc) ? state->crtc->base.id : 0;

	} else if (property == config->dpms_property) {

		*val = connector->dpms;

	} else if (connector->funcs->atomic_get_property) {

		return connector->funcs->atomic_get_property(connector,

				state, property, val);

	} else {

		return -EINVAL;

	}

	return 0;

}

int drm_atomic_get_property(struct drm_mode_object *obj,

		struct drm_property *property, uint64_t *val)

{

	struct drm_device *dev = property->dev;

	int ret;

	switch (obj->type) {

	case DRM_MODE_OBJECT_CONNECTOR: {

		struct drm_connector *connector = obj_to_connector(obj);

		WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

		ret = drm_atomic_connector_get_property(connector,

				connector->state, property, val);

		break;

	}

	case DRM_MODE_OBJECT_CRTC: {

		struct drm_crtc *crtc = obj_to_crtc(obj);

		WARN_ON(!drm_modeset_is_locked(&crtc->mutex));

		ret = drm_atomic_crtc_get_property(crtc,

				crtc->state, property, val);

		break;

	}

	case DRM_MODE_OBJECT_PLANE: {

		struct drm_plane *plane = obj_to_plane(obj);

		WARN_ON(!drm_modeset_is_locked(&plane->mutex));

		ret = drm_atomic_plane_get_property(plane,

				plane->state, property, val);

		break;

	}

	default:

		ret = -EINVAL;

		break;

	}

	return ret;

}

/**

 * drm_atomic_set_crtc_for_plane - set crtc for plane

 * @plane_state: the plane whose incoming state to update

 * @crtc: crtc to use for the plane

 *

 * Changing the assigned crtc for a plane requires us to grab the lock and state

 * for the new crtc, as needed. This function takes care of all these details

 * besides updating the pointer in the state object itself.

 *

 * Returns:

 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK

 * then the w/w mutex code has detected a deadlock and the entire atomic

 * sequence must be restarted. All other errors are fatal.

 */

int

drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,

			      struct drm_crtc *crtc)

{

	struct drm_plane *plane = plane_state->plane;

	struct drm_crtc_state *crtc_state;

	if (plane_state->crtc) {

		crtc_state = drm_atomic_get_crtc_state(plane_state->state,

						       plane_state->crtc);

		if (WARN_ON(IS_ERR(crtc_state)))

			return PTR_ERR(crtc_state);

		crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));

	}

	plane_state->crtc = crtc;

	if (crtc) {

		crtc_state = drm_atomic_get_crtc_state(plane_state->state,

						       crtc);

		if (IS_ERR(crtc_state))

			return PTR_ERR(crtc_state);

		crtc_state->plane_mask |= (1 << drm_plane_index(plane));

	}

	if (crtc)

		DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d:%s]\n",

				 plane_state, crtc->base.id, crtc->name);

	else

		DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",

				 plane_state);

	return 0;

}

EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);