/* * 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_atomic_uapi.h> #include <drm/drm_mode.h> #include <drm/drm_print.h> #include <drm/drm_writeback.h> #include <linux/sync_file.h> #include "drm_crtc_internal.h" #include "drm_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 should only be used by drivers which are still subclassing * &drm_atomic_state and haven't switched to &drm_private_state yet. */ void drm_atomic_state_default_release(struct drm_atomic_state *state) { kfree(state->connectors); kfree(state->crtcs); kfree(state->planes); kfree(state->private_objs); } 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 should only be used by drivers which are still subclassing * &drm_atomic_state and haven't switched to &drm_private_state yet. */ 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; if (!config->funcs->atomic_state_alloc) { struct drm_atomic_state *state; 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 should only be used by drivers which are still subclassing * &drm_atomic_state and haven't switched to &drm_private_state yet. */ 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; state->connectors[i].old_state = NULL; state->connectors[i].new_state = NULL; drm_connector_put(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); state->crtcs[i].ptr = NULL; state->crtcs[i].state = NULL; state->crtcs[i].old_state = NULL; state->crtcs[i].new_state = NULL; if (state->crtcs[i].commit) { drm_crtc_commit_put(state->crtcs[i].commit); state->crtcs[i].commit = 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; state->planes[i].old_state = NULL; state->planes[i].new_state = NULL; } for (i = 0; i < state->num_private_objs; i++) { struct drm_private_obj *obj = state->private_objs[i].ptr; obj->funcs->atomic_destroy_state(obj, state->private_objs[i].state); state->private_objs[i].ptr = NULL; state->private_objs[i].state = NULL; state->private_objs[i].old_state = NULL; state->private_objs[i].new_state = NULL; } state->num_private_objs = 0; if (state->fake_commit) { drm_crtc_commit_put(state->fake_commit); state->fake_commit = 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 int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state, const struct drm_crtc_state *new_crtc_state) { struct drm_crtc *crtc = new_crtc_state->crtc; /* 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 (new_crtc_state->active && !new_crtc_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(new_crtc_state->enable && !new_crtc_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(!new_crtc_state->enable && new_crtc_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 (new_crtc_state->event && !new_crtc_state->active && !old_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); } static int drm_atomic_connector_check(struct drm_connector *connector, struct drm_connector_state *state) { struct drm_crtc_state *crtc_state; struct drm_writeback_job *writeback_job = state->writeback_job; const struct drm_display_info *info = &connector->display_info; state->max_bpc = info->bpc ? info->bpc : 8; if (connector->max_bpc_property) state->max_bpc = min(state->max_bpc, state->max_requested_bpc); if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job) return 0; if (writeback_job->fb && !state->crtc) { DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] framebuffer without CRTC\n", connector->base.id, connector->name); return -EINVAL; } if (state->crtc) crtc_state = drm_atomic_get_existing_crtc_state(state->state, state->crtc); if (writeback_job->fb && !crtc_state->active) { DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n", connector->base.id, connector->name, state->crtc->base.id); return -EINVAL; } if (writeback_job->out_fence && !writeback_job->fb) { DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n", connector->base.id, connector->name); return -EINVAL; } return 0; } /** * drm_atomic_get_plane_state - get plane state * @state: global atomic state object * @plane: plane to get state object for * * This function returns the plane state for the given plane, allocating it if * needed. It will also grab the relevant plane lock to make sure that the state * is consistent. * * Returns: * * Either the allocated state or the error code encoded into the pointer. When * the error is EDEADLK then the w/w mutex code has detected a deadlock and the * entire atomic sequence must be restarted. All other errors are fatal. */ struct drm_plane_state * drm_atomic_get_plane_state(struct drm_atomic_state *state, struct drm_plane *plane) { int ret, index = drm_plane_index(plane); struct drm_plane_state *plane_state; WARN_ON(!state->acquire_ctx); /* the legacy pointers should never be set */ WARN_ON(plane->fb); WARN_ON(plane->old_fb); WARN_ON(plane->crtc); 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); static bool plane_switching_crtc(const struct drm_plane_state *old_plane_state, const struct drm_plane_state *new_plane_state) { if (!old_plane_state->crtc || !new_plane_state->crtc) return false; if (old_plane_state->crtc == new_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 * @old_plane_state: old plane state to check * @new_plane_state: new 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(const struct drm_plane_state *old_plane_state, const struct drm_plane_state *new_plane_state) { struct drm_plane *plane = new_plane_state->plane; struct drm_crtc *crtc = new_plane_state->crtc; const struct drm_framebuffer *fb = new_plane_state->fb; unsigned int fb_width, fb_height; struct drm_mode_rect *clips; uint32_t num_clips; int ret; /* either *both* CRTC and FB must be set, or neither */ if (crtc && !fb) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] CRTC set but no FB\n", plane->base.id, plane->name); return -EINVAL; } else if (fb && !crtc) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] FB set but no CRTC\n", plane->base.id, plane->name); return -EINVAL; } /* if disabled, we don't care about the rest of the state: */ if (!crtc) return 0; /* Check whether this plane is usable on this CRTC */ if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) { DRM_DEBUG_ATOMIC("Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n", crtc->base.id, crtc->name, plane->base.id, plane->name); return -EINVAL; } /* Check whether this plane supports the fb pixel format. */ ret = drm_plane_check_pixel_format(plane, fb->format->format, fb->modifier); if (ret) { struct drm_format_name_buf format_name; DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n", plane->base.id, plane->name, drm_get_format_name(fb->format->format, &format_name), fb->modifier); return ret; } /* Give drivers some help against integer overflows */ if (new_plane_state->crtc_w > INT_MAX || new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w || new_plane_state->crtc_h > INT_MAX || new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n", plane->base.id, plane->name, new_plane_state->crtc_w, new_plane_state->crtc_h, new_plane_state->crtc_x, new_plane_state->crtc_y); return -ERANGE; } fb_width = fb->width << 16; fb_height = fb->height << 16; /* Make sure source coordinates are inside the fb. */ if (new_plane_state->src_w > fb_width || new_plane_state->src_x > fb_width - new_plane_state->src_w || new_plane_state->src_h > fb_height || new_plane_state->src_y > fb_height - new_plane_state->src_h) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid source coordinates " "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n", plane->base.id, plane->name, new_plane_state->src_w >> 16, ((new_plane_state->src_w & 0xffff) * 15625) >> 10, new_plane_state->src_h >> 16, ((new_plane_state->src_h & 0xffff) * 15625) >> 10, new_plane_state->src_x >> 16, ((new_plane_state->src_x & 0xffff) * 15625) >> 10, new_plane_state->src_y >> 16, ((new_plane_state->src_y & 0xffff) * 15625) >> 10, fb->width, fb->height); return -ENOSPC; } clips = drm_plane_get_damage_clips(new_plane_state); num_clips = drm_plane_get_damage_clips_count(new_plane_state); /* Make sure damage clips are valid and inside the fb. */ while (num_clips > 0) { if (clips->x1 >= clips->x2 || clips->y1 >= clips->y2 || clips->x1 < 0 || clips->y1 < 0 || clips->x2 > fb_width || clips->y2 > fb_height) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid damage clip %d %d %d %d\n", plane->base.id, plane->name, clips->x1, clips->y1, clips->x2, clips->y2); return -EINVAL; } clips++; num_clips--; } if (plane_switching_crtc(old_plane_state, new_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) drm_framebuffer_print_info(p, 2, state->fb); 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); drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos); drm_printf(p, "\tcolor-encoding=%s\n", drm_get_color_encoding_name(state->color_encoding)); drm_printf(p, "\tcolor-range=%s\n", drm_get_color_range_name(state->color_range)); if (plane->funcs->atomic_print_state) plane->funcs->atomic_print_state(p, state); } /** * DOC: handling driver private state * * Very often the DRM objects exposed to userspace in the atomic modeset api * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the * underlying hardware. Especially for any kind of shared resources (e.g. shared * clocks, scaler units, bandwidth and fifo limits shared among a group of * planes or CRTCs, and so on) it makes sense to model these as independent * objects. Drivers then need to do similar state tracking and commit ordering for * such private (since not exposed to userpace) objects as the atomic core and * helpers already provide for connectors, planes and CRTCs. * * To make this easier on drivers the atomic core provides some support to track * driver private state objects using struct &drm_private_obj, with the * associated state struct &drm_private_state. * * Similar to userspace-exposed objects, private state structures can be * acquired by calling drm_atomic_get_private_obj_state(). Since this function * does not take care of locking, drivers should wrap it for each type of * private state object they have with the required call to drm_modeset_lock() * for the corresponding &drm_modeset_lock. * * All private state structures contained in a &drm_atomic_state update can be * iterated using for_each_oldnew_private_obj_in_state(), * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state(). * Drivers are recommended to wrap these for each type of driver private state * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at * least if they want to iterate over all objects of a given type. * * An earlier way to handle driver private state was by subclassing struct * &drm_atomic_state. But since that encourages non-standard ways to implement * the check/commit split atomic requires (by using e.g. "check and rollback or * commit instead" of "duplicate state, check, then either commit or release * duplicated state) it is deprecated in favour of using &drm_private_state. */ /** * drm_atomic_private_obj_init - initialize private object * @dev: DRM device this object will be attached to * @obj: private object * @state: initial private object state * @funcs: pointer to the struct of function pointers that identify the object * type * * Initialize the private object, which can be embedded into any * driver private object that needs its own atomic state. */ void drm_atomic_private_obj_init(struct drm_device *dev, struct drm_private_obj *obj, struct drm_private_state *state, const struct drm_private_state_funcs *funcs) { memset(obj, 0, sizeof(*obj)); drm_modeset_lock_init(&obj->lock); obj->state = state; obj->funcs = funcs; list_add_tail(&obj->head, &dev->mode_config.privobj_list); } EXPORT_SYMBOL(drm_atomic_private_obj_init); /** * drm_atomic_private_obj_fini - finalize private object * @obj: private object * * Finalize the private object. */ void drm_atomic_private_obj_fini(struct drm_private_obj *obj) { list_del(&obj->head); obj->funcs->atomic_destroy_state(obj, obj->state); drm_modeset_lock_fini(&obj->lock); } EXPORT_SYMBOL(drm_atomic_private_obj_fini); /** * drm_atomic_get_private_obj_state - get private object state * @state: global atomic state * @obj: private object to get the state for * * This function returns the private object state for the given private object, * allocating the state if needed. It will also grab the relevant private * object lock to make sure that the state is consistent. * * RETURNS: * * Either the allocated state or the error code encoded into a pointer. */ struct drm_private_state * drm_atomic_get_private_obj_state(struct drm_atomic_state *state, struct drm_private_obj *obj) { int index, num_objs, i, ret; size_t size; struct __drm_private_objs_state *arr; struct drm_private_state *obj_state; for (i = 0; i < state->num_private_objs; i++) if (obj == state->private_objs[i].ptr) return state->private_objs[i].state; ret = drm_modeset_lock(&obj->lock, state->acquire_ctx); if (ret) return ERR_PTR(ret); num_objs = state->num_private_objs + 1; size = sizeof(*state->private_objs) * num_objs; arr = krealloc(state->private_objs, size, GFP_KERNEL); if (!arr) return ERR_PTR(-ENOMEM); state->private_objs = arr; index = state->num_private_objs; memset(&state->private_objs[index], 0, sizeof(*state->private_objs)); obj_state = obj->funcs->atomic_duplicate_state(obj); if (!obj_state) return ERR_PTR(-ENOMEM); state->private_objs[index].state = obj_state; state->private_objs[index].old_state = obj->state; state->private_objs[index].new_state = obj_state; state->private_objs[index].ptr = obj; obj_state->state = state; state->num_private_objs = num_objs; DRM_DEBUG_ATOMIC("Added new private object %p state %p to %p\n", obj, obj_state, state); return obj_state; } EXPORT_SYMBOL(drm_atomic_get_private_obj_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_get(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); 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->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) if (state->writeback_job && state->writeback_job->fb) drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id); if (connector->funcs->atomic_print_state) connector->funcs->atomic_print_state(p, state); } /** * 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_begin(state->dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { if (!(crtc_state->connector_mask & drm_connector_mask(connector))) continue; conn_state = drm_atomic_get_connector_state(state, connector); if (IS_ERR(conn_state)) { drm_connector_list_iter_end(&conn_iter); return PTR_ERR(conn_state); } } drm_connector_list_iter_end(&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) { const struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc); struct drm_plane *plane; WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc)); DRM_DEBUG_ATOMIC("Adding all current planes for [CRTC:%d:%s] to %p\n", crtc->base.id, crtc->name, state); drm_for_each_plane_mask(plane, state->dev, old_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_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 *old_plane_state; struct drm_plane_state *new_plane_state; struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; struct drm_crtc_state *new_crtc_state; struct drm_connector *conn; struct drm_connector_state *conn_state; int i, ret = 0; DRM_DEBUG_ATOMIC("checking %p\n", state); for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { ret = drm_atomic_plane_check(old_plane_state, new_plane_state); if (ret) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n", plane->base.id, plane->name); return ret; } } for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state); if (ret) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n", crtc->base.id, crtc->name); return ret; } } for_each_new_connector_in_state(state, conn, conn_state, i) { ret = drm_atomic_connector_check(conn, conn_state); if (ret) { DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] atomic core check failed\n", conn->base.id, conn->name); return ret; } } if (config->funcs->atomic_check) { ret = config->funcs->atomic_check(state->dev, state); if (ret) { DRM_DEBUG_ATOMIC("atomic driver check for %p failed: %d\n", state, ret); return ret; } } if (!state->allow_modeset) { for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { if (drm_atomic_crtc_needs_modeset(new_crtc_state)) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n", crtc->base.id, crtc->name); return -EINVAL; } } } 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. * * 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("committing %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("committing %p nonblocking\n", state); return config->funcs->atomic_commit(state->dev, state, true); } EXPORT_SYMBOL(drm_atomic_nonblocking_commit); 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); } static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p, bool take_locks) { 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_drv_uses_atomic_modeset(dev)) return; list_for_each_entry(plane, &config->plane_list, head) { if (take_locks) drm_modeset_lock(&plane->mutex, NULL); drm_atomic_plane_print_state(p, plane->state); if (take_locks) drm_modeset_unlock(&plane->mutex); } list_for_each_entry(crtc, &config->crtc_list, head) { if (take_locks) drm_modeset_lock(&crtc->mutex, NULL); drm_atomic_crtc_print_state(p, crtc->state); if (take_locks) drm_modeset_unlock(&crtc->mutex); } drm_connector_list_iter_begin(dev, &conn_iter); if (take_locks) drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); drm_for_each_connector_iter(connector, &conn_iter) drm_atomic_connector_print_state(p, connector->state); if (take_locks) drm_modeset_unlock(&dev->mode_config.connection_mutex); drm_connector_list_iter_end(&conn_iter); } /** * 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) { __drm_state_dump(dev, p, false); } 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_state_dump(dev, &p, true); 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