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Diffstat (limited to 'drivers/gpu/drm/drm_atomic.c')
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 1789 |
1 files changed, 1789 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c new file mode 100644 index 000000000..711589825 --- /dev/null +++ b/drivers/gpu/drm/drm_atomic.c @@ -0,0 +1,1789 @@ +/* + * Copyright (C) 2014 Red Hat + * Copyright (C) 2014 Intel Corp. + * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved. + * + * 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 <linux/sync_file.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_uapi.h> +#include <drm/drm_blend.h> +#include <drm/drm_bridge.h> +#include <drm/drm_debugfs.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_file.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_framebuffer.h> +#include <drm/drm_mode.h> +#include <drm/drm_print.h> +#include <drm/drm_writeback.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_crtc_commit_wait - Waits for a commit to complete + * @commit: &drm_crtc_commit to wait for + * + * Waits for a given &drm_crtc_commit to be programmed into the + * hardware and flipped to. + * + * Returns: + * + * 0 on success, a negative error code otherwise. + */ +int drm_crtc_commit_wait(struct drm_crtc_commit *commit) +{ + unsigned long timeout = 10 * HZ; + int ret; + + if (!commit) + return 0; + + ret = wait_for_completion_timeout(&commit->hw_done, timeout); + if (!ret) { + drm_err(commit->crtc->dev, "hw_done timed out\n"); + return -ETIMEDOUT; + } + + /* + * Currently no support for overwriting flips, hence + * stall for previous one to execute completely. + */ + ret = wait_for_completion_timeout(&commit->flip_done, timeout); + if (!ret) { + drm_err(commit->crtc->dev, "flip_done timed out\n"); + return -ETIMEDOUT; + } + + return 0; +} +EXPORT_SYMBOL(drm_crtc_commit_wait); + +/** + * 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; + + /* + * Because drm_atomic_state can be committed asynchronously we need our + * own reference and cannot rely on the on implied by drm_file in the + * ioctl call. + */ + drm_dev_get(dev); + state->dev = dev; + + drm_dbg_atomic(dev, "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_dbg_atomic(dev, "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_device *dev = state->dev; + struct drm_mode_config *config = &dev->mode_config; + + drm_atomic_state_clear(state); + + drm_dbg_atomic(state->dev, "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); + } + + drm_dev_put(dev); +} +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. + * + * WARNING: Drivers may only add new CRTC states to a @state if + * drm_atomic_state.allow_modeset is set, or if it's a driver-internal commit + * not created by userspace through an IOCTL call. + * + * 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_dbg_atomic(state->dev, "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_dbg_atomic(crtc->dev, + "[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_dbg_atomic(crtc->dev, + "[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_dbg_atomic(crtc->dev, + "[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_dbg_atomic(crtc->dev, + "[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, "\tself_refresh_active=%d\n", state->self_refresh_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_dbg_atomic(connector->dev, + "[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_dbg_atomic(connector->dev, + "[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->fb) { + if (writeback_job->out_fence) { + drm_dbg_atomic(connector->dev, + "[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n", + connector->base.id, connector->name); + return -EINVAL; + } + + drm_writeback_cleanup_job(writeback_job); + state->writeback_job = NULL; + } + + 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_dbg_atomic(plane->dev, "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_dbg_atomic(plane->dev, "[PLANE:%d:%s] CRTC set but no FB\n", + plane->base.id, plane->name); + return -EINVAL; + } else if (fb && !crtc) { + drm_dbg_atomic(plane->dev, "[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_dbg_atomic(plane->dev, + "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) { + drm_dbg_atomic(plane->dev, + "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n", + plane->base.id, plane->name, + &fb->format->format, 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_dbg_atomic(plane->dev, + "[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_dbg_atomic(plane->dev, + "[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_dbg_atomic(plane->dev, + "[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_dbg_atomic(plane->dev, + "[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 userspace) 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(). This also takes care + * of locking, hence drivers should not have a need to call drm_modeset_lock() + * directly. Sequence of the actual hardware state commit is not handled, + * drivers might need to keep track of struct drm_crtc_commit within subclassed + * structure of &drm_private_state as necessary, e.g. similar to + * &drm_plane_state.commit. See also &drm_atomic_state.fake_commit. + * + * 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); + + state->obj = obj; +} +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_dbg_atomic(state->dev, + "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_old_private_obj_state + * @state: global atomic state object + * @obj: private_obj to grab + * + * This function returns the old private object state for the given private_obj, + * or NULL if the private_obj is not part of the global atomic state. + */ +struct drm_private_state * +drm_atomic_get_old_private_obj_state(struct drm_atomic_state *state, + struct drm_private_obj *obj) +{ + int i; + + for (i = 0; i < state->num_private_objs; i++) + if (obj == state->private_objs[i].ptr) + return state->private_objs[i].old_state; + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_old_private_obj_state); + +/** + * drm_atomic_get_new_private_obj_state + * @state: global atomic state object + * @obj: private_obj to grab + * + * This function returns the new private object state for the given private_obj, + * or NULL if the private_obj is not part of the global atomic state. + */ +struct drm_private_state * +drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state, + struct drm_private_obj *obj) +{ + int i; + + for (i = 0; i < state->num_private_objs; i++) + if (obj == state->private_objs[i].ptr) + return state->private_objs[i].new_state; + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state); + +/** + * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder + * @state: Atomic state + * @encoder: The encoder to fetch the connector state for + * + * This function finds and returns the connector that was connected to @encoder + * as specified by the @state. + * + * If there is no connector in @state which previously had @encoder connected to + * it, this function will return NULL. While this may seem like an invalid use + * case, it is sometimes useful to differentiate commits which had no prior + * connectors attached to @encoder vs ones that did (and to inspect their + * state). This is especially true in enable hooks because the pipeline has + * changed. + * + * Returns: The old connector connected to @encoder, or NULL if the encoder is + * not connected. + */ +struct drm_connector * +drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_connector_state *conn_state; + struct drm_connector *connector; + unsigned int i; + + for_each_old_connector_in_state(state, connector, conn_state, i) { + if (conn_state->best_encoder == encoder) + return connector; + } + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder); + +/** + * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder + * @state: Atomic state + * @encoder: The encoder to fetch the connector state for + * + * This function finds and returns the connector that will be connected to + * @encoder as specified by the @state. + * + * If there is no connector in @state which will have @encoder connected to it, + * this function will return NULL. While this may seem like an invalid use case, + * it is sometimes useful to differentiate commits which have no connectors + * attached to @encoder vs ones that do (and to inspect their state). This is + * especially true in disable hooks because the pipeline will change. + * + * Returns: The new connector connected to @encoder, or NULL if the encoder is + * not connected. + */ +struct drm_connector * +drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_connector_state *conn_state; + struct drm_connector *connector; + unsigned int i; + + for_each_new_connector_in_state(state, connector, conn_state, i) { + if (conn_state->best_encoder == encoder) + return connector; + } + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder); + +/** + * 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_array(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_dbg_atomic(connector->dev, "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)"); + drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware); + drm_printf(p, "\tmax_requested_bpc=%d\n", state->max_requested_bpc); + + 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_get_bridge_state - get bridge state + * @state: global atomic state object + * @bridge: bridge to get state object for + * + * This function returns the bridge state for the given bridge, allocating it + * if needed. It will also grab the relevant bridge 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. + */ +struct drm_bridge_state * +drm_atomic_get_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_private_obj_state(state, &bridge->base); + if (IS_ERR(obj_state)) + return ERR_CAST(obj_state); + + return drm_priv_to_bridge_state(obj_state); +} +EXPORT_SYMBOL(drm_atomic_get_bridge_state); + +/** + * drm_atomic_get_old_bridge_state - get old bridge state, if it exists + * @state: global atomic state object + * @bridge: bridge to grab + * + * This function returns the old bridge state for the given bridge, or NULL if + * the bridge is not part of the global atomic state. + */ +struct drm_bridge_state * +drm_atomic_get_old_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base); + if (!obj_state) + return NULL; + + return drm_priv_to_bridge_state(obj_state); +} +EXPORT_SYMBOL(drm_atomic_get_old_bridge_state); + +/** + * drm_atomic_get_new_bridge_state - get new bridge state, if it exists + * @state: global atomic state object + * @bridge: bridge to grab + * + * This function returns the new bridge state for the given bridge, or NULL if + * the bridge is not part of the global atomic state. + */ +struct drm_bridge_state * +drm_atomic_get_new_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base); + if (!obj_state) + return NULL; + + return drm_priv_to_bridge_state(obj_state); +} +EXPORT_SYMBOL(drm_atomic_get_new_bridge_state); + +/** + * drm_atomic_add_encoder_bridges - add bridges attached to an encoder + * @state: atomic state + * @encoder: DRM encoder + * + * This function adds all bridges attached to @encoder. This is needed to add + * bridge states to @state and make them available when + * &drm_bridge_funcs.atomic_check(), &drm_bridge_funcs.atomic_pre_enable(), + * &drm_bridge_funcs.atomic_enable(), + * &drm_bridge_funcs.atomic_disable_post_disable() are called. + * + * 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_encoder_bridges(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_bridge_state *bridge_state; + struct drm_bridge *bridge; + + if (!encoder) + return 0; + + drm_dbg_atomic(encoder->dev, + "Adding all bridges for [encoder:%d:%s] to %p\n", + encoder->base.id, encoder->name, state); + + drm_for_each_bridge_in_chain(encoder, bridge) { + /* Skip bridges that don't implement the atomic state hooks. */ + if (!bridge->funcs->atomic_duplicate_state) + continue; + + bridge_state = drm_atomic_get_bridge_state(state, bridge); + if (IS_ERR(bridge_state)) + return PTR_ERR(bridge_state); + } + + return 0; +} +EXPORT_SYMBOL(drm_atomic_add_encoder_bridges); + +/** + * 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 serialization 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_dbg_atomic(crtc->dev, + "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 parallelism 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_dbg_atomic(crtc->dev, + "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; + unsigned int requested_crtc = 0; + unsigned int affected_crtc = 0; + int i, ret = 0; + + drm_dbg_atomic(dev, "checking %p\n", state); + + for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { + if (new_crtc_state->enable) + requested_crtc |= drm_crtc_mask(crtc); + } + + 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_dbg_atomic(dev, "[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_dbg_atomic(dev, "[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_dbg_atomic(dev, "[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_dbg_atomic(dev, "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_dbg_atomic(dev, "[CRTC:%d:%s] requires full modeset\n", + crtc->base.id, crtc->name); + return -EINVAL; + } + } + } + + for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { + if (new_crtc_state->enable) + affected_crtc |= drm_crtc_mask(crtc); + } + + /* + * For commits that allow modesets drivers can add other CRTCs to the + * atomic commit, e.g. when they need to reallocate global resources. + * This can cause spurious EBUSY, which robs compositors of a very + * effective sanity check for their drawing loop. Therefor only allow + * drivers to add unrelated CRTC states for modeset commits. + * + * FIXME: Should add affected_crtc mask to the ATOMIC IOCTL as an output + * so compositors know what's going on. + */ + if (affected_crtc != requested_crtc) { + drm_dbg_atomic(dev, + "driver added CRTC to commit: requested 0x%x, affected 0x%0x\n", + requested_crtc, affected_crtc); + WARN(!state->allow_modeset, "adding CRTC not allowed without modesets: requested 0x%x, affected 0x%0x\n", + requested_crtc, affected_crtc); + } + + 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; + struct drm_printer p = drm_info_printer(state->dev->dev); + int ret; + + if (drm_debug_enabled(DRM_UT_STATE)) + drm_atomic_print_new_state(state, &p); + + ret = drm_atomic_check_only(state); + if (ret) + return ret; + + drm_dbg_atomic(state->dev, "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_dbg_atomic(state->dev, "committing %p nonblocking\n", state); + + return config->funcs->atomic_commit(state->dev, state, true); +} +EXPORT_SYMBOL(drm_atomic_nonblocking_commit); + +/* just used from drm-client and atomic-helper: */ +int __drm_atomic_helper_disable_plane(struct drm_plane *plane, + struct drm_plane_state *plane_state) +{ + int ret; + + ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); + if (ret != 0) + return ret; + + drm_atomic_set_fb_for_plane(plane_state, NULL); + plane_state->crtc_x = 0; + plane_state->crtc_y = 0; + plane_state->crtc_w = 0; + plane_state->crtc_h = 0; + plane_state->src_x = 0; + plane_state->src_y = 0; + plane_state->src_w = 0; + plane_state->src_h = 0; + + return 0; +} +EXPORT_SYMBOL(__drm_atomic_helper_disable_plane); + +static int update_output_state(struct drm_atomic_state *state, + struct drm_mode_set *set) +{ + struct drm_device *dev = set->crtc->dev; + struct drm_crtc *crtc; + struct drm_crtc_state *new_crtc_state; + struct drm_connector *connector; + struct drm_connector_state *new_conn_state; + int ret, i; + + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, + state->acquire_ctx); + if (ret) + return ret; + + /* First disable all connectors on the target crtc. */ + ret = drm_atomic_add_affected_connectors(state, set->crtc); + if (ret) + return ret; + + for_each_new_connector_in_state(state, connector, new_conn_state, i) { + if (new_conn_state->crtc == set->crtc) { + ret = drm_atomic_set_crtc_for_connector(new_conn_state, + NULL); + if (ret) + return ret; + + /* Make sure legacy setCrtc always re-trains */ + new_conn_state->link_status = DRM_LINK_STATUS_GOOD; + } + } + + /* Then set all connectors from set->connectors on the target crtc */ + for (i = 0; i < set->num_connectors; i++) { + new_conn_state = drm_atomic_get_connector_state(state, + set->connectors[i]); + if (IS_ERR(new_conn_state)) + return PTR_ERR(new_conn_state); + + ret = drm_atomic_set_crtc_for_connector(new_conn_state, + set->crtc); + if (ret) + return ret; + } + + for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { + /* + * Don't update ->enable for the CRTC in the set_config request, + * since a mismatch would indicate a bug in the upper layers. + * The actual modeset code later on will catch any + * inconsistencies here. + */ + if (crtc == set->crtc) + continue; + + if (!new_crtc_state->connector_mask) { + ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state, + NULL); + if (ret < 0) + return ret; + + new_crtc_state->active = false; + } + } + + return 0; +} + +/* just used from drm-client and atomic-helper: */ +int __drm_atomic_helper_set_config(struct drm_mode_set *set, + struct drm_atomic_state *state) +{ + struct drm_crtc_state *crtc_state; + struct drm_plane_state *primary_state; + struct drm_crtc *crtc = set->crtc; + int hdisplay, vdisplay; + int ret; + + crtc_state = drm_atomic_get_crtc_state(state, crtc); + if (IS_ERR(crtc_state)) + return PTR_ERR(crtc_state); + + primary_state = drm_atomic_get_plane_state(state, crtc->primary); + if (IS_ERR(primary_state)) + return PTR_ERR(primary_state); + + if (!set->mode) { + WARN_ON(set->fb); + WARN_ON(set->num_connectors); + + ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL); + if (ret != 0) + return ret; + + crtc_state->active = false; + + ret = drm_atomic_set_crtc_for_plane(primary_state, NULL); + if (ret != 0) + return ret; + + drm_atomic_set_fb_for_plane(primary_state, NULL); + + goto commit; + } + + WARN_ON(!set->fb); + WARN_ON(!set->num_connectors); + + ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode); + if (ret != 0) + return ret; + + crtc_state->active = true; + + ret = drm_atomic_set_crtc_for_plane(primary_state, crtc); + if (ret != 0) + return ret; + + drm_mode_get_hv_timing(set->mode, &hdisplay, &vdisplay); + + drm_atomic_set_fb_for_plane(primary_state, set->fb); + primary_state->crtc_x = 0; + primary_state->crtc_y = 0; + primary_state->crtc_w = hdisplay; + primary_state->crtc_h = vdisplay; + primary_state->src_x = set->x << 16; + primary_state->src_y = set->y << 16; + if (drm_rotation_90_or_270(primary_state->rotation)) { + primary_state->src_w = vdisplay << 16; + primary_state->src_h = hdisplay << 16; + } else { + primary_state->src_w = hdisplay << 16; + primary_state->src_h = vdisplay << 16; + } + +commit: + ret = update_output_state(state, set); + if (ret) + return ret; + + return 0; +} +EXPORT_SYMBOL(__drm_atomic_helper_set_config); + +static void drm_atomic_private_obj_print_state(struct drm_printer *p, + const struct drm_private_state *state) +{ + struct drm_private_obj *obj = state->obj; + + if (obj->funcs->atomic_print_state) + obj->funcs->atomic_print_state(p, state); +} + +/** + * drm_atomic_print_new_state - prints drm atomic state + * @state: atomic configuration to check + * @p: drm printer + * + * This functions prints the drm atomic state snapshot using the drm printer + * which is passed to it. This snapshot can be used for debugging purposes. + * + * Note that this function looks into the new state objects and hence its not + * safe to be used after the call to drm_atomic_helper_commit_hw_done(). + */ +void drm_atomic_print_new_state(const struct drm_atomic_state *state, + struct drm_printer *p) +{ + 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; + struct drm_private_obj *obj; + struct drm_private_state *obj_state; + int i; + + if (!p) { + drm_err(state->dev, "invalid drm printer\n"); + return; + } + + drm_dbg_atomic(state->dev, "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); + + for_each_new_private_obj_in_state(state, obj, obj_state, i) + drm_atomic_private_obj_print_state(p, obj_state); +} +EXPORT_SYMBOL(drm_atomic_print_new_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 wrap this drm_modeset_lock_all_ctx() and + * drm_modeset_drop_locks(). If this is called from error irq handler, it should + * not be enabled by default - if you are debugging errors you might + * not care that this is racey, but calling this without all modeset locks held + * is inherently unsafe. + */ +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}, +}; + +void drm_atomic_debugfs_init(struct drm_minor *minor) +{ + drm_debugfs_create_files(drm_atomic_debugfs_list, + ARRAY_SIZE(drm_atomic_debugfs_list), + minor->debugfs_root, minor); +} +#endif |