/* * 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 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);