diff options
Diffstat (limited to 'drivers/gpu/drm/drm_atomic.c')
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 657 |
1 files changed, 657 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c new file mode 100644 index 000000000000..ff5f034cc405 --- /dev/null +++ b/drivers/gpu/drm/drm_atomic.c @@ -0,0 +1,657 @@ +/* + * 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 + * @state: the incoming atomic state + * @plane: 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_atomic_state *state, + struct drm_plane *plane, struct drm_crtc *crtc) +{ + struct drm_plane_state *plane_state = + drm_atomic_get_plane_state(state, plane); + struct drm_crtc_state *crtc_state; + + if (WARN_ON(IS_ERR(plane_state))) + return PTR_ERR(plane_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_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); |