| /* |
| * 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> |
| |
| static void kfree_state(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); |
| kfree(state); |
| } |
| |
| /** |
| * 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_atomic_state *state; |
| |
| state = kzalloc(sizeof(*state), GFP_KERNEL); |
| if (!state) |
| return NULL; |
| |
| 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_KMS("Allocate atomic state %p\n", state); |
| |
| return state; |
| fail: |
| kfree_state(state); |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(drm_atomic_state_alloc); |
| |
| /** |
| * 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; |
| int i; |
| |
| DRM_DEBUG_KMS("Clearing atomic state %p\n", state); |
| |
| for (i = 0; i < state->num_connector; i++) { |
| struct drm_connector *connector = state->connectors[i]; |
| |
| if (!connector) |
| continue; |
| |
| WARN_ON(!drm_modeset_is_locked(&config->connection_mutex)); |
| |
| connector->funcs->atomic_destroy_state(connector, |
| state->connector_states[i]); |
| } |
| |
| 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]); |
| } |
| |
| 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]); |
| } |
| } |
| 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) |
| { |
| drm_atomic_state_clear(state); |
| |
| DRM_DEBUG_KMS("Freeing atomic state %p\n", state); |
| |
| kfree_state(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; |
| struct drm_crtc_state *crtc_state; |
| |
| index = drm_crtc_index(crtc); |
| |
| if (state->crtc_states[index]) |
| return state->crtc_states[index]; |
| |
| 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_KMS("Added [CRTC:%d] %p state to %p\n", |
| crtc->base.id, crtc_state, state); |
| |
| return crtc_state; |
| } |
| EXPORT_SYMBOL(drm_atomic_get_crtc_state); |
| |
| /** |
| * 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; |
| struct drm_plane_state *plane_state; |
| |
| index = drm_plane_index(plane); |
| |
| if (state->plane_states[index]) |
| return state->plane_states[index]; |
| |
| 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_KMS("Added [PLANE:%d] %p state to %p\n", |
| plane->base.id, 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_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); |
| |
| /* |
| * Construction of atomic state updates can race with a connector |
| * hot-add which might overflow. In this case flip the table and just |
| * restart the entire ioctl - no one is fast enough to livelock a cpu |
| * with physical hotplug events anyway. |
| * |
| * Note that we only grab the indexes once we have the right lock to |
| * prevent hotplug/unplugging of connectors. So removal is no problem, |
| * at most the array is a bit too large. |
| */ |
| if (index >= state->num_connector) { |
| DRM_DEBUG_KMS("Hot-added connector would overflow state array, restarting\n"); |
| return ERR_PTR(-EAGAIN); |
| } |
| |
| 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_KMS("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_set_crtc_for_plane - set crtc for plane |
| * @plane_state: atomic state object for the plane |
| * @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_crtc_state *crtc_state; |
| |
| if (crtc) { |
| crtc_state = drm_atomic_get_crtc_state(plane_state->state, |
| crtc); |
| if (IS_ERR(crtc_state)) |
| return PTR_ERR(crtc_state); |
| } |
| |
| plane_state->crtc = crtc; |
| |
| if (crtc) |
| DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n", |
| plane_state, crtc->base.id); |
| else |
| DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane); |
| |
| /** |
| * drm_atomic_set_fb_for_plane - set crtc for plane |
| * @plane_state: atomic state object for the plane |
| * @fb: fb to use for the plane |
| * |
| * Changing the assigned framebuffer for a plane requires us to grab a reference |
| * to the new fb and drop the reference to the old fb, if there is one. This |
| * function takes care of all these details besides updating the pointer in the |
| * state object itself. |
| */ |
| void |
| drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state, |
| struct drm_framebuffer *fb) |
| { |
| if (plane_state->fb) |
| drm_framebuffer_unreference(plane_state->fb); |
| if (fb) |
| drm_framebuffer_reference(fb); |
| plane_state->fb = fb; |
| |
| if (fb) |
| DRM_DEBUG_KMS("Set [FB:%d] for plane state %p\n", |
| fb->base.id, plane_state); |
| else |
| DRM_DEBUG_KMS("Set [NOFB] for plane state %p\n", plane_state); |
| } |
| EXPORT_SYMBOL(drm_atomic_set_fb_for_plane); |
| |
| /** |
| * drm_atomic_set_crtc_for_connector - set crtc for connector |
| * @conn_state: atomic state object for the connector |
| * @crtc: crtc to use for the connector |
| * |
| * Changing the assigned crtc for a connector 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_connector(struct drm_connector_state *conn_state, |
| struct drm_crtc *crtc) |
| { |
| struct drm_crtc_state *crtc_state; |
| |
| if (crtc) { |
| crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc); |
| if (IS_ERR(crtc_state)) |
| return PTR_ERR(crtc_state); |
| } |
| |
| conn_state->crtc = crtc; |
| |
| if (crtc) |
| DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n", |
| conn_state, crtc->base.id); |
| else |
| DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n", |
| conn_state); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector); |
| |
| /** |
| * drm_atomic_add_affected_connectors - add connectors for crtc |
| * @state: atomic state |
| * @crtc: DRM crtc |
| * |
| * This function walks the current configuration and adds all connectors |
| * currently using @crtc to the atomic configuration @state. Note that this |
| * function must acquire the connection mutex. This can potentially cause |
| * unneeded seralization if the update is just for the planes on one crtc. Hence |
| * drivers and helpers should only call this when really needed (e.g. when a |
| * full modeset needs to happen due to some change). |
| * |
| * 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_add_affected_connectors(struct drm_atomic_state *state, |
| struct drm_crtc *crtc) |
| { |
| struct drm_mode_config *config = &state->dev->mode_config; |
| struct drm_connector *connector; |
| struct drm_connector_state *conn_state; |
| int ret; |
| |
| ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); |
| if (ret) |
| return ret; |
| |
| DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n", |
| crtc->base.id, state); |
| |
| /* |
| * Changed connectors are already in @state, so only need to look at the |
| * current configuration. |
| */ |
| list_for_each_entry(connector, &config->connector_list, head) { |
| if (connector->state->crtc != crtc) |
| continue; |
| |
| conn_state = drm_atomic_get_connector_state(state, connector); |
| if (IS_ERR(conn_state)) |
| return PTR_ERR(conn_state); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_atomic_add_affected_connectors); |
| |
| /** |
| * drm_atomic_connectors_for_crtc - count number of connected outputs |
| * @state: atomic state |
| * @crtc: DRM crtc |
| * |
| * This function counts all connectors which will be connected to @crtc |
| * according to @state. Useful to recompute the enable state for @crtc. |
| */ |
| int |
| drm_atomic_connectors_for_crtc(struct drm_atomic_state *state, |
| struct drm_crtc *crtc) |
| { |
| int i, num_connected_connectors = 0; |
| |
| for (i = 0; i < state->num_connector; i++) { |
| struct drm_connector_state *conn_state; |
| |
| conn_state = state->connector_states[i]; |
| |
| if (conn_state && conn_state->crtc == crtc) |
| num_connected_connectors++; |
| } |
| |
| DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n", |
| state, num_connected_connectors, crtc->base.id); |
| |
| return num_connected_connectors; |
| } |
| EXPORT_SYMBOL(drm_atomic_connectors_for_crtc); |
| |
| /** |
| * drm_atomic_legacy_backoff - locking backoff for legacy ioctls |
| * @state: atomic state |
| * |
| * This function should be used by legacy entry points which don't understand |
| * -EDEADLK semantics. For simplicity this one will grab all modeset locks after |
| * the slowpath completed. |
| */ |
| void drm_atomic_legacy_backoff(struct drm_atomic_state *state) |
| { |
| int ret; |
| |
| retry: |
| drm_modeset_backoff(state->acquire_ctx); |
| |
| ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex, |
| state->acquire_ctx); |
| if (ret) |
| goto retry; |
| ret = drm_modeset_lock_all_crtcs(state->dev, |
| state->acquire_ctx); |
| if (ret) |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_legacy_backoff); |
| |
| /** |
| * drm_atomic_check_only - check whether a given config would work |
| * @state: atomic configuration to check |
| * |
| * Note that this function can return -EDEADLK if the driver needed to acquire |
| * more locks but encountered a deadlock. The caller must then do the usual w/w |
| * backoff dance and restart. All other errors are fatal. |
| * |
| * Returns: |
| * 0 on success, negative error code on failure. |
| */ |
| int drm_atomic_check_only(struct drm_atomic_state *state) |
| { |
| struct drm_mode_config *config = &state->dev->mode_config; |
| |
| DRM_DEBUG_KMS("checking %p\n", state); |
| |
| if (config->funcs->atomic_check) |
| return config->funcs->atomic_check(state->dev, state); |
| else |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_atomic_check_only); |
| |
| /** |
| * drm_atomic_commit - commit configuration atomically |
| * @state: atomic configuration to check |
| * |
| * Note that this function can return -EDEADLK if the driver needed to acquire |
| * more locks but encountered a deadlock. The caller must then do the usual w/w |
| * backoff dance and restart. All other errors are fatal. |
| * |
| * Also note that on successful execution ownership of @state is transferred |
| * from the caller of this function to the function itself. The caller must not |
| * free or in any other way access @state. If the function fails then the caller |
| * must clean up @state itself. |
| * |
| * Returns: |
| * 0 on success, negative error code on failure. |
| */ |
| int drm_atomic_commit(struct drm_atomic_state *state) |
| { |
| struct drm_mode_config *config = &state->dev->mode_config; |
| int ret; |
| |
| ret = drm_atomic_check_only(state); |
| if (ret) |
| return ret; |
| |
| DRM_DEBUG_KMS("commiting %p\n", state); |
| |
| return config->funcs->atomic_commit(state->dev, state, false); |
| } |
| EXPORT_SYMBOL(drm_atomic_commit); |
| |
| /** |
| * drm_atomic_async_commit - atomic&async configuration commit |
| * @state: atomic configuration to check |
| * |
| * Note that this function can return -EDEADLK if the driver needed to acquire |
| * more locks but encountered a deadlock. The caller must then do the usual w/w |
| * backoff dance and restart. All other errors are fatal. |
| * |
| * Also note that on successful execution ownership of @state is transferred |
| * from the caller of this function to the function itself. The caller must not |
| * free or in any other way access @state. If the function fails then the caller |
| * must clean up @state itself. |
| * |
| * Returns: |
| * 0 on success, negative error code on failure. |
| */ |
| int drm_atomic_async_commit(struct drm_atomic_state *state) |
| { |
| struct drm_mode_config *config = &state->dev->mode_config; |
| int ret; |
| |
| ret = drm_atomic_check_only(state); |
| if (ret) |
| return ret; |
| |
| DRM_DEBUG_KMS("commiting %p asynchronously\n", state); |
| |
| return config->funcs->atomic_commit(state->dev, state, true); |
| } |
| EXPORT_SYMBOL(drm_atomic_async_commit); |