/* * 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 #include #include #include "drm_crtc_internal.h" void __drm_crtc_commit_free(struct kref *kref) { struct drm_crtc_commit *commit = container_of(kref, struct drm_crtc_commit, ref); kfree(commit); } EXPORT_SYMBOL(__drm_crtc_commit_free); /** * drm_atomic_state_default_release - * release memory initialized by drm_atomic_state_init * @state: atomic state * * Free all the memory allocated by drm_atomic_state_init. * This 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->crtcs); kfree(state->planes); } 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) { kref_init(&state->ref); /* TODO legacy paths should maybe do a better job about * setting this appropriately? */ state->allow_modeset = true; state->crtcs = kcalloc(dev->mode_config.num_crtc, sizeof(*state->crtcs), GFP_KERNEL); if (!state->crtcs) goto fail; state->planes = kcalloc(dev->mode_config.num_total_plane, sizeof(*state->planes), GFP_KERNEL); if (!state->planes) goto fail; state->dev = dev; DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state); return 0; fail: drm_atomic_state_default_release(state); return -ENOMEM; } EXPORT_SYMBOL(drm_atomic_state_init); /** * drm_atomic_state_alloc - allocate atomic state * @dev: DRM device * * This allocates an empty atomic state to track updates. */ struct drm_atomic_state * drm_atomic_state_alloc(struct drm_device *dev) { struct drm_mode_config *config = &dev->mode_config; 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].ptr; if (!connector) continue; connector->funcs->atomic_destroy_state(connector, state->connectors[i].state); state->connectors[i].ptr = NULL; state->connectors[i].state = NULL; drm_connector_unreference(connector); } for (i = 0; i < config->num_crtc; i++) { struct drm_crtc *crtc = state->crtcs[i].ptr; if (!crtc) continue; crtc->funcs->atomic_destroy_state(crtc, state->crtcs[i].state); if (state->crtcs[i].commit) { kfree(state->crtcs[i].commit->event); state->crtcs[i].commit->event = NULL; drm_crtc_commit_put(state->crtcs[i].commit); } state->crtcs[i].commit = NULL; state->crtcs[i].ptr = NULL; state->crtcs[i].state = NULL; } for (i = 0; i < config->num_total_plane; i++) { struct drm_plane *plane = state->planes[i].ptr; if (!plane) continue; plane->funcs->atomic_destroy_state(plane, state->planes[i].state); state->planes[i].ptr = NULL; state->planes[i].state = NULL; } } EXPORT_SYMBOL(drm_atomic_state_default_clear); /** * drm_atomic_state_clear - clear state object * @state: atomic state * * When the w/w mutex algorithm detects a deadlock we need to back off and drop * all locks. So someone else could sneak in and change the current modeset * configuration. Which means that all the state assembled in @state is no * longer an atomic update to the current state, but to some arbitrary earlier * state. Which could break assumptions the driver's * &drm_mode_config_funcs.atomic_check likely relies on. * * Hence we must clear all cached state and completely start over, using this * function. */ void drm_atomic_state_clear(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; struct drm_mode_config *config = &dev->mode_config; if (config->funcs->atomic_state_clear) config->funcs->atomic_state_clear(state); else drm_atomic_state_default_clear(state); } EXPORT_SYMBOL(drm_atomic_state_clear); /** * __drm_atomic_state_free - free all memory for an atomic state * @ref: This 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 kref *ref) { struct drm_atomic_state *state = container_of(ref, typeof(*state), ref); struct drm_mode_config *config = &state->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; WARN_ON(!state->acquire_ctx); 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->crtcs[index].state = crtc_state; state->crtcs[index].old_state = crtc->state; state->crtcs[index].new_state = crtc_state; state->crtcs[index].ptr = 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); static void set_out_fence_for_crtc(struct drm_atomic_state *state, struct drm_crtc *crtc, s32 __user *fence_ptr) { state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr; } static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state, struct drm_crtc *crtc) { s32 __user *fence_ptr; fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr; state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL; return fence_ptr; } /** * 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 and update * the enable property. * * 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; 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_property_blob *new_blob = NULL; if (blob_id != 0) { new_blob = drm_property_lookup_blob(crtc->dev, blob_id); if (new_blob == NULL) return -EINVAL; if (expected_size > 0 && expected_size != new_blob->length) { drm_property_unreference_blob(new_blob); return -EINVAL; } } drm_atomic_replace_property_blob(blob, new_blob, replaced); drm_property_unreference_blob(new_blob); 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 * * This function handles generic/core properties and calls out to driver's * &drm_crtc_funcs.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 (property == config->prop_out_fence_ptr) { s32 __user *fence_ptr = u64_to_user_ptr(val); if (!fence_ptr) return 0; if (put_user(-1, fence_ptr)) return -EFAULT; set_out_fence_for_crtc(state->state, crtc, fence_ptr); } 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 * &drm_crtc_funcs.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 (property == config->prop_out_fence_ptr) *val = 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:%s] requesting event but off\n", crtc->base.id, crtc->name); return -EINVAL; } return 0; } static void drm_atomic_crtc_print_state(struct drm_printer *p, const struct drm_crtc_state *state) { struct drm_crtc *crtc = state->crtc; drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name); drm_printf(p, "\tenable=%d\n", state->enable); drm_printf(p, "\tactive=%d\n", state->active); drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed); drm_printf(p, "\tmode_changed=%d\n", state->mode_changed); drm_printf(p, "\tactive_changed=%d\n", state->active_changed); drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed); drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed); drm_printf(p, "\tplane_mask=%x\n", state->plane_mask); drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask); drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask); drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode)); if (crtc->funcs->atomic_print_state) crtc->funcs->atomic_print_state(p, 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 = drm_plane_index(plane); struct drm_plane_state *plane_state; WARN_ON(!state->acquire_ctx); 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->planes[index].state = plane_state; state->planes[index].ptr = plane; state->planes[index].old_state = plane->state; state->planes[index].new_state = plane_state; 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 * * This function handles generic/core properties and calls out to driver's * &drm_plane_funcs.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_in_fence_fd) { if (state->fence) return -EINVAL; if (U642I64(val) == -1) return 0; state->fence = sync_file_get_fence(val); if (!state->fence) return -EINVAL; } 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 == plane->rotation_property) { if (!is_power_of_2(val & DRM_ROTATE_MASK)) return -EINVAL; state->rotation = val; } else if (property == plane->zpos_property) { state->zpos = 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 * &drm_plane_funcs.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_in_fence_fd) { *val = -1; } 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 == plane->rotation_property) { *val = state->rotation; } else if (property == plane->zpos_property) { *val = state->zpos; } 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->format->format); if (ret) { struct drm_format_name_buf format_name; DRM_DEBUG_ATOMIC("Invalid pixel format %s\n", drm_get_format_name(state->fb->format->format, &format_name)); 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; } static void drm_atomic_plane_print_state(struct drm_printer *p, const struct drm_plane_state *state) { struct drm_plane *plane = state->plane; struct drm_rect src = drm_plane_state_src(state); struct drm_rect dest = drm_plane_state_dest(state); drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name); drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)"); drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0); if (state->fb) { struct drm_framebuffer *fb = state->fb; int i, n = fb->format->num_planes; struct drm_format_name_buf format_name; drm_printf(p, "\t\tformat=%s\n", drm_get_format_name(fb->format->format, &format_name)); drm_printf(p, "\t\t\tmodifier=0x%llx\n", fb->modifier); drm_printf(p, "\t\tsize=%dx%d\n", fb->width, fb->height); drm_printf(p, "\t\tlayers:\n"); for (i = 0; i < n; i++) { drm_printf(p, "\t\t\tpitch[%d]=%u\n", i, fb->pitches[i]); drm_printf(p, "\t\t\toffset[%d]=%u\n", i, fb->offsets[i]); } } drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest)); drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src)); drm_printf(p, "\trotation=%x\n", state->rotation); if (plane->funcs->atomic_print_state) plane->funcs->atomic_print_state(p, 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; WARN_ON(!state->acquire_ctx); 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_connnectors_state *c; 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)); state->num_connector = alloc; } if (state->connectors[index].state) return state->connectors[index].state; connector_state = connector->funcs->atomic_duplicate_state(connector); if (!connector_state) return ERR_PTR(-ENOMEM); drm_connector_reference(connector); state->connectors[index].state = connector_state; state->connectors[index].old_state = connector->state; state->connectors[index].new_state = connector_state; state->connectors[index].ptr = connector; connector_state->state = state; DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d:%s] %p state to %p\n", connector->base.id, connector->name, 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 * * This function handles generic/core properties and calls out to driver's * &drm_connector_funcs.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 (property == config->tv_select_subconnector_property) { state->tv.subconnector = val; } else if (property == config->tv_left_margin_property) { state->tv.margins.left = val; } else if (property == config->tv_right_margin_property) { state->tv.margins.right = val; } else if (property == config->tv_top_margin_property) { state->tv.margins.top = val; } else if (property == config->tv_bottom_margin_property) { state->tv.margins.bottom = val; } else if (property == config->tv_mode_property) { state->tv.mode = val; } else if (property == config->tv_brightness_property) { state->tv.brightness = val; } else if (property == config->tv_contrast_property) { state->tv.contrast = val; } else if (property == config->tv_flicker_reduction_property) { state->tv.flicker_reduction = val; } else if (property == config->tv_overscan_property) { state->tv.overscan = val; } else if (property == config->tv_saturation_property) { state->tv.saturation = val; } else if (property == config->tv_hue_property) { state->tv.hue = val; } else if (property == config->link_status_property) { /* Never downgrade from GOOD to BAD on userspace's request here, * only hw issues can do that. * * For an atomic property the userspace doesn't need to be able * to understand all the properties, but needs to be able to * restore the state it wants on VT switch. So if the userspace * tries to change the link_status from GOOD to BAD, driver * silently rejects it and returns a 0. This prevents userspace * from accidently breaking the display when it restores the * state. */ if (state->link_status != DRM_LINK_STATUS_GOOD) state->link_status = val; } else if (connector->funcs->atomic_set_property) { return connector->funcs->atomic_set_property(connector, state, property, val); } else { return -EINVAL; } return 0; } EXPORT_SYMBOL(drm_atomic_connector_set_property); static void drm_atomic_connector_print_state(struct drm_printer *p, const struct drm_connector_state *state) { struct drm_connector *connector = state->connector; drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name); drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)"); if (connector->funcs->atomic_print_state) connector->funcs->atomic_print_state(p, state); } /** * 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 * &drm_connector_funcs.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 (property == config->tv_select_subconnector_property) { *val = state->tv.subconnector; } else if (property == config->tv_left_margin_property) { *val = state->tv.margins.left; } else if (property == config->tv_right_margin_property) { *val = state->tv.margins.right; } else if (property == config->tv_top_margin_property) { *val = state->tv.margins.top; } else if (property == config->tv_bottom_margin_property) { *val = state->tv.margins.bottom; } else if (property == config->tv_mode_property) { *val = state->tv.mode; } else if (property == config->tv_brightness_property) { *val = state->tv.brightness; } else if (property == config->tv_contrast_property) { *val = state->tv.contrast; } else if (property == config->tv_flicker_reduction_property) { *val = state->tv.flicker_reduction; } else if (property == config->tv_overscan_property) { *val = state->tv.overscan; } else if (property == config->tv_saturation_property) { *val = state->tv.saturation; } else if (property == config->tv_hue_property) { *val = state->tv.hue; } else if (property == config->link_status_property) { *val = state->link_status; } 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); /** * drm_atomic_set_fb_for_plane - set framebuffer 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 (fb) DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n", fb->base.id, plane_state); else DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n", plane_state); drm_framebuffer_assign(&plane_state->fb, fb); } EXPORT_SYMBOL(drm_atomic_set_fb_for_plane); /** * drm_atomic_set_fence_for_plane - set fence for plane * @plane_state: atomic state object for the plane * @fence: dma_fence to use for the plane * * Helper to setup the plane_state fence in case it is not set yet. * By using this drivers doesn't need to worry if the user choose * implicit or explicit fencing. * * This function will not set the fence to the state if it was set * via explicit fencing interfaces on the atomic ioctl. In that case it will * drop the reference to the fence as we are not storing it anywhere. * Otherwise, if &drm_plane_state.fence is not set this function we just set it * with the received implicit fence. In both cases this function consumes a * reference for @fence. */ void drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state, struct dma_fence *fence) { if (plane_state->fence) { dma_fence_put(fence); return; } plane_state->fence = fence; } EXPORT_SYMBOL(drm_atomic_set_fence_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 (conn_state->crtc == crtc) return 0; if (conn_state->crtc) { crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state, conn_state->crtc); crtc_state->connector_mask &= ~(1 << drm_connector_index(conn_state->connector)); drm_connector_unreference(conn_state->connector); conn_state->crtc = NULL; } if (crtc) { crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc); if (IS_ERR(crtc_state)) return PTR_ERR(crtc_state); crtc_state->connector_mask |= 1 << drm_connector_index(conn_state->connector); drm_connector_reference(conn_state->connector); conn_state->crtc = crtc; DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n", conn_state, crtc->base.id, crtc->name); } else { DRM_DEBUG_ATOMIC("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; struct drm_connector_list_iter conn_iter; struct drm_crtc_state *crtc_state; int ret; crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) return PTR_ERR(crtc_state); ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); if (ret) return ret; DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n", crtc->base.id, crtc->name, state); /* * Changed connectors are already in @state, so only need to look * at the connector_mask in crtc_state. */ drm_connector_list_iter_get(state->dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { if (!(crtc_state->connector_mask & (1 << drm_connector_index(connector)))) continue; conn_state = drm_atomic_get_connector_state(state, connector); if (IS_ERR(conn_state)) { drm_connector_list_iter_put(&conn_iter); return PTR_ERR(conn_state); } } drm_connector_list_iter_put(&conn_iter); return 0; } EXPORT_SYMBOL(drm_atomic_add_affected_connectors); /** * drm_atomic_add_affected_planes - add planes for crtc * @state: atomic state * @crtc: DRM crtc * * This function walks the current configuration and adds all planes * currently used by @crtc to the atomic configuration @state. This is useful * when an atomic commit also needs to check all currently enabled plane on * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC * to avoid special code to force-enable all planes. * * Since acquiring a plane state will always also acquire the w/w mutex of the * current CRTC for that plane (if there is any) adding all the plane states for * a CRTC will not reduce parallism of atomic updates. * * 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_planes(struct drm_atomic_state *state, struct drm_crtc *crtc) { struct drm_plane *plane; WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc)); drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) { struct drm_plane_state *plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) return PTR_ERR(plane_state); } return 0; } EXPORT_SYMBOL(drm_atomic_add_affected_planes); /** * 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) { struct drm_device *dev = state->dev; unsigned crtc_mask = 0; struct drm_crtc *crtc; int ret; bool global = false; drm_for_each_crtc(crtc, dev) { if (crtc->acquire_ctx != state->acquire_ctx) continue; crtc_mask |= drm_crtc_mask(crtc); crtc->acquire_ctx = NULL; } if (WARN_ON(dev->mode_config.acquire_ctx == state->acquire_ctx)) { global = true; dev->mode_config.acquire_ctx = NULL; } retry: drm_modeset_backoff(state->acquire_ctx); ret = drm_modeset_lock_all_ctx(dev, state->acquire_ctx); if (ret) goto retry; drm_for_each_crtc(crtc, dev) if (drm_crtc_mask(crtc) & crtc_mask) crtc->acquire_ctx = state->acquire_ctx; if (global) dev->mode_config.acquire_ctx = state->acquire_ctx; } 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_device *dev = state->dev; struct drm_mode_config *config = &dev->mode_config; struct drm_plane *plane; struct drm_plane_state *plane_state; struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; int i, ret = 0; DRM_DEBUG_ATOMIC("checking %p\n", state); for_each_new_plane_in_state(state, plane, plane_state, i) { ret = drm_atomic_plane_check(plane, plane_state); if (ret) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n", plane->base.id, plane->name); return ret; } } for_each_new_crtc_in_state(state, crtc, crtc_state, i) { ret = drm_atomic_crtc_check(crtc, crtc_state); if (ret) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n", crtc->base.id, crtc->name); return ret; } } if (config->funcs->atomic_check) ret = config->funcs->atomic_check(state->dev, state); if (!state->allow_modeset) { for_each_new_crtc_in_state(state, crtc, crtc_state, i) { if (drm_atomic_crtc_needs_modeset(crtc_state)) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n", crtc->base.id, crtc->name); return -EINVAL; } } } return ret; } 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. * * This function will take its own reference on @state. * Callers should always release their reference with drm_atomic_state_put(). * * 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_ATOMIC("commiting %p\n", state); return config->funcs->atomic_commit(state->dev, state, false); } EXPORT_SYMBOL(drm_atomic_commit); /** * drm_atomic_nonblocking_commit - atomic nonblocking 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. * * This function will take its own reference on @state. * Callers should always release their reference with drm_atomic_state_put(). * * Returns: * 0 on success, negative error code on failure. */ int drm_atomic_nonblocking_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_ATOMIC("commiting %p nonblocking\n", state); return config->funcs->atomic_commit(state->dev, state, true); } EXPORT_SYMBOL(drm_atomic_nonblocking_commit); static void drm_atomic_print_state(const struct drm_atomic_state *state) { struct drm_printer p = drm_info_printer(state->dev->dev); struct drm_plane *plane; struct drm_plane_state *plane_state; struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_connector *connector; struct drm_connector_state *connector_state; int i; DRM_DEBUG_ATOMIC("checking %p\n", state); for_each_new_plane_in_state(state, plane, plane_state, i) drm_atomic_plane_print_state(&p, plane_state); for_each_new_crtc_in_state(state, crtc, crtc_state, i) drm_atomic_crtc_print_state(&p, crtc_state); for_each_new_connector_in_state(state, connector, connector_state, i) drm_atomic_connector_print_state(&p, connector_state); } /** * drm_state_dump - dump entire device atomic state * @dev: the drm device * @p: where to print the state to * * Just for debugging. Drivers might want an option to dump state * to dmesg in case of error irq's. (Hint, you probably want to * ratelimit this!) * * The caller must drm_modeset_lock_all(), or if this is called * from error irq handler, it should not be enabled by default. * (Ie. if you are debugging errors you might not care that this * is racey. But calling this without all modeset locks held is * not inherently safe.) */ void drm_state_dump(struct drm_device *dev, struct drm_printer *p) { struct drm_mode_config *config = &dev->mode_config; struct drm_plane *plane; struct drm_crtc *crtc; struct drm_connector *connector; struct drm_connector_list_iter conn_iter; if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) return; list_for_each_entry(plane, &config->plane_list, head) drm_atomic_plane_print_state(p, plane->state); list_for_each_entry(crtc, &config->crtc_list, head) drm_atomic_crtc_print_state(p, crtc->state); drm_connector_list_iter_get(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) drm_atomic_connector_print_state(p, connector->state); drm_connector_list_iter_put(&conn_iter); } EXPORT_SYMBOL(drm_state_dump); #ifdef CONFIG_DEBUG_FS static int drm_state_info(struct seq_file *m, void *data) { struct drm_info_node *node = (struct drm_info_node *) m->private; struct drm_device *dev = node->minor->dev; struct drm_printer p = drm_seq_file_printer(m); drm_modeset_lock_all(dev); drm_state_dump(dev, &p); drm_modeset_unlock_all(dev); return 0; } /* any use in debugfs files to dump individual planes/crtc/etc? */ static const struct drm_info_list drm_atomic_debugfs_list[] = { {"state", drm_state_info, 0}, }; int drm_atomic_debugfs_init(struct drm_minor *minor) { return drm_debugfs_create_files(drm_atomic_debugfs_list, ARRAY_SIZE(drm_atomic_debugfs_list), minor->debugfs_root, minor); } #endif /* * The big monstor ioctl */ static struct drm_pending_vblank_event *create_vblank_event( struct drm_device *dev, uint64_t user_data) { struct drm_pending_vblank_event *e = NULL; e = kzalloc(sizeof *e, GFP_KERNEL); if (!e) return NULL; e->event.base.type = DRM_EVENT_FLIP_COMPLETE; e->event.base.length = sizeof(e->event); e->event.user_data = user_data; return e; } static int atomic_set_prop(struct drm_atomic_state *state, struct drm_mode_object *obj, struct drm_property *prop, uint64_t prop_value) { struct drm_mode_object *ref; int ret; if (!drm_property_change_valid_get(prop, prop_value, &ref)) return -EINVAL; switch (obj->type) { case DRM_MODE_OBJECT_CONNECTOR: { struct drm_connector *connector = obj_to_connector(obj); struct drm_connector_state *connector_state; connector_state = drm_atomic_get_connector_state(state, connector); if (IS_ERR(connector_state)) { ret = PTR_ERR(connector_state); break; } ret = drm_atomic_connector_set_property(connector, connector_state, prop, prop_value); break; } case DRM_MODE_OBJECT_CRTC: { struct drm_crtc *crtc = obj_to_crtc(obj); struct drm_crtc_state *crtc_state; crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { ret = PTR_ERR(crtc_state); break; } ret = drm_atomic_crtc_set_property(crtc, crtc_state, prop, prop_value); break; } case DRM_MODE_OBJECT_PLANE: { struct drm_plane *plane = obj_to_plane(obj); struct drm_plane_state *plane_state; plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { ret = PTR_ERR(plane_state); break; } ret = drm_atomic_plane_set_property(plane, plane_state, prop, prop_value); break; } default: ret = -EINVAL; break; } drm_property_change_valid_put(prop, ref); return ret; } /** * drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers. * * @dev: drm device to check. * @plane_mask: plane mask for planes that were updated. * @ret: return value, can be -EDEADLK for a retry. * * Before doing an update &drm_plane.old_fb is set to &drm_plane.fb, but before * dropping the locks old_fb needs to be set to NULL and plane->fb updated. This * is a common operation for each atomic update, so this call is split off as a * helper. */ void drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret) { struct drm_plane *plane; /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping * locks (ie. while it is still safe to deref plane->state). We * need to do this here because the driver entry points cannot * distinguish between legacy and atomic ioctls. */ drm_for_each_plane_mask(plane, dev, plane_mask) { if (ret == 0) { struct drm_framebuffer *new_fb = plane->state->fb; if (new_fb) drm_framebuffer_reference(new_fb); plane->fb = new_fb; plane->crtc = plane->state->crtc; if (plane->old_fb) drm_framebuffer_unreference(plane->old_fb); } plane->old_fb = NULL; } } EXPORT_SYMBOL(drm_atomic_clean_old_fb); /** * DOC: explicit fencing properties * * Explicit fencing allows userspace to control the buffer synchronization * between devices. A Fence or a group of fences are transfered to/from * userspace using Sync File fds and there are two DRM properties for that. * IN_FENCE_FD on each DRM Plane to send fences to the kernel and * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel. * * As a contrast, with implicit fencing the kernel keeps track of any * ongoing rendering, and automatically ensures that the atomic update waits * for any pending rendering to complete. For shared buffers represented with * a &struct dma_buf this is tracked in &struct reservation_object. * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org), * whereas explicit fencing is what Android wants. * * "IN_FENCE_FD”: * Use this property to pass a fence that DRM should wait on before * proceeding with the Atomic Commit request and show the framebuffer for * the plane on the screen. The fence can be either a normal fence or a * merged one, the sync_file framework will handle both cases and use a * fence_array if a merged fence is received. Passing -1 here means no * fences to wait on. * * If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag * it will only check if the Sync File is a valid one. * * On the driver side the fence is stored on the @fence parameter of * &struct drm_plane_state. Drivers which also support implicit fencing * should set the implicit fence using drm_atomic_set_fence_for_plane(), * to make sure there's consistent behaviour between drivers in precedence * of implicit vs. explicit fencing. * * "OUT_FENCE_PTR”: * Use this property to pass a file descriptor pointer to DRM. Once the * Atomic Commit request call returns OUT_FENCE_PTR will be filled with * the file descriptor number of a Sync File. This Sync File contains the * CRTC fence that will be signaled when all framebuffers present on the * Atomic Commit * request for that given CRTC are scanned out on the * screen. * * The Atomic Commit request fails if a invalid pointer is passed. If the * Atomic Commit request fails for any other reason the out fence fd * returned will be -1. On a Atomic Commit with the * DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1. * * Note that out-fences don't have a special interface to drivers and are * internally represented by a &struct drm_pending_vblank_event in struct * &drm_crtc_state, which is also used by the nonblocking atomic commit * helpers and for the DRM event handling for existing userspace. */ struct drm_out_fence_state { s32 __user *out_fence_ptr; struct sync_file *sync_file; int fd; }; static int setup_out_fence(struct drm_out_fence_state *fence_state, struct dma_fence *fence) { fence_state->fd = get_unused_fd_flags(O_CLOEXEC); if (fence_state->fd < 0) return fence_state->fd; if (put_user(fence_state->fd, fence_state->out_fence_ptr)) return -EFAULT; fence_state->sync_file = sync_file_create(fence); if (!fence_state->sync_file) return -ENOMEM; return 0; } static int prepare_crtc_signaling(struct drm_device *dev, struct drm_atomic_state *state, struct drm_mode_atomic *arg, struct drm_file *file_priv, struct drm_out_fence_state **fence_state, unsigned int *num_fences) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; int i, ret; if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) return 0; for_each_new_crtc_in_state(state, crtc, crtc_state, i) { s32 __user *fence_ptr; fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc); if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) { struct drm_pending_vblank_event *e; e = create_vblank_event(dev, arg->user_data); if (!e) return -ENOMEM; crtc_state->event = e; } if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) { struct drm_pending_vblank_event *e = crtc_state->event; if (!file_priv) continue; ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base); if (ret) { kfree(e); crtc_state->event = NULL; return ret; } } if (fence_ptr) { struct dma_fence *fence; struct drm_out_fence_state *f; f = krealloc(*fence_state, sizeof(**fence_state) * (*num_fences + 1), GFP_KERNEL); if (!f) return -ENOMEM; memset(&f[*num_fences], 0, sizeof(*f)); f[*num_fences].out_fence_ptr = fence_ptr; *fence_state = f; fence = drm_crtc_create_fence(crtc); if (!fence) return -ENOMEM; ret = setup_out_fence(&f[(*num_fences)++], fence); if (ret) { dma_fence_put(fence); return ret; } crtc_state->event->base.fence = fence; } } return 0; } static void complete_crtc_signaling(struct drm_device *dev, struct drm_atomic_state *state, struct drm_out_fence_state *fence_state, unsigned int num_fences, bool install_fds) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; int i; if (install_fds) { for (i = 0; i < num_fences; i++) fd_install(fence_state[i].fd, fence_state[i].sync_file->file); kfree(fence_state); return; } for_each_new_crtc_in_state(state, crtc, crtc_state, i) { struct drm_pending_vblank_event *event = crtc_state->event; /* * Free the allocated event. drm_atomic_helper_setup_commit * can allocate an event too, so only free it if it's ours * to prevent a double free in drm_atomic_state_clear. */ if (event && (event->base.fence || event->base.file_priv)) { drm_event_cancel_free(dev, &event->base); crtc_state->event = NULL; } } if (!fence_state) return; for (i = 0; i < num_fences; i++) { if (fence_state[i].sync_file) fput(fence_state[i].sync_file->file); if (fence_state[i].fd >= 0) put_unused_fd(fence_state[i].fd); /* If this fails log error to the user */ if (fence_state[i].out_fence_ptr && put_user(-1, fence_state[i].out_fence_ptr)) DRM_DEBUG_ATOMIC("Couldn't clear out_fence_ptr\n"); } kfree(fence_state); } int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_mode_atomic *arg = data; uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr); uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr); uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr); uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr); unsigned int copied_objs, copied_props; struct drm_atomic_state *state; struct drm_modeset_acquire_ctx ctx; struct drm_plane *plane; struct drm_out_fence_state *fence_state = NULL; unsigned plane_mask; int ret = 0; unsigned int i, j, num_fences = 0; /* disallow for drivers not supporting atomic: */ if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) return -EINVAL; /* disallow for userspace that has not enabled atomic cap (even * though this may be a bit overkill, since legacy userspace * wouldn't know how to call this ioctl) */ if (!file_priv->atomic) return -EINVAL; if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) return -EINVAL; if (arg->reserved) return -EINVAL; if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) && !dev->mode_config.async_page_flip) return -EINVAL; /* can't test and expect an event at the same time. */ if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) return -EINVAL; drm_modeset_acquire_init(&ctx, 0); state = drm_atomic_state_alloc(dev); if (!state) return -ENOMEM; state->acquire_ctx = &ctx; state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET); retry: plane_mask = 0; copied_objs = 0; copied_props = 0; for (i = 0; i < arg->count_objs; i++) { uint32_t obj_id, count_props; struct drm_mode_object *obj; if (get_user(obj_id, objs_ptr + copied_objs)) { ret = -EFAULT; goto out; } obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY); if (!obj) { ret = -ENOENT; goto out; } if (!obj->properties) { drm_mode_object_unreference(obj); ret = -ENOENT; goto out; } if (get_user(count_props, count_props_ptr + copied_objs)) { drm_mode_object_unreference(obj); ret = -EFAULT; goto out; } copied_objs++; for (j = 0; j < count_props; j++) { uint32_t prop_id; uint64_t prop_value; struct drm_property *prop; if (get_user(prop_id, props_ptr + copied_props)) { drm_mode_object_unreference(obj); ret = -EFAULT; goto out; } prop = drm_mode_obj_find_prop_id(obj, prop_id); if (!prop) { drm_mode_object_unreference(obj); ret = -ENOENT; goto out; } if (copy_from_user(&prop_value, prop_values_ptr + copied_props, sizeof(prop_value))) { drm_mode_object_unreference(obj); ret = -EFAULT; goto out; } ret = atomic_set_prop(state, obj, prop, prop_value); if (ret) { drm_mode_object_unreference(obj); goto out; } copied_props++; } if (obj->type == DRM_MODE_OBJECT_PLANE && count_props && !(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) { plane = obj_to_plane(obj); plane_mask |= (1 << drm_plane_index(plane)); plane->old_fb = plane->fb; } drm_mode_object_unreference(obj); } ret = prepare_crtc_signaling(dev, state, arg, file_priv, &fence_state, &num_fences); if (ret) goto out; if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) { ret = drm_atomic_check_only(state); } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) { ret = drm_atomic_nonblocking_commit(state); } else { if (unlikely(drm_debug & DRM_UT_STATE)) drm_atomic_print_state(state); ret = drm_atomic_commit(state); } out: drm_atomic_clean_old_fb(dev, plane_mask, ret); complete_crtc_signaling(dev, state, fence_state, num_fences, !ret); if (ret == -EDEADLK) { drm_atomic_state_clear(state); drm_modeset_backoff(&ctx); goto retry; } drm_atomic_state_put(state); drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); return ret; }