OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​drm_atomic_uapi.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright (C) 2014 Red Hat
  * Copyright (C) 2014 Intel Corp.
  * Copyright (C) 2018 Intel Corp.
  * Copyright (c) 2020, 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 <drm/drm_atomic_uapi.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_print.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_writeback.h>
 #include <drm/drm_vblank.h>
 
 #include <linux/dma-fence.h>
 #include <linux/uaccess.h>
 #include <linux/sync_file.h>
 #include <linux/file.h>
 
 #include "drm_crtc_internal.h"
 
 /**
  * DOC: overview
  *
  * This file contains the marshalling and demarshalling glue for the atomic UAPI
  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
  * drivers which have special needs to construct their own atomic updates, e.g.
  * for load detect or similar.
  */
 
 /**
  * drm_atomic_set_mode_for_crtc - set mode for CRTC
  * @state: the CRTC whose incoming state to update
  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
  *
  * Set a mode (originating from the kernel) on the desired CRTC state and update
  * the enable property.
  *
  * RETURNS:
  * Zero on success, error code on failure. Cannot return -EDEADLK.
  */
 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
                  const struct drm_display_mode *mode)
 {
     struct drm_crtc *crtc = state->crtc;
     struct drm_mode_modeinfo umode;
 
     /* Early return for no change. */
     if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
         return 0;
 
     drm_property_blob_put(state->mode_blob);
     state->mode_blob = NULL;
 
     if (mode) {
         struct drm_property_blob *blob;
 
         drm_mode_convert_to_umode(&umode, mode);
         blob = drm_property_create_blob(crtc->dev,
                         sizeof(umode), &umode);
         if (IS_ERR(blob))
             return PTR_ERR(blob);
 
         drm_mode_copy(&state->mode, mode);
 
         state->mode_blob = blob;
         state->enable = true;
         drm_dbg_atomic(crtc->dev,
                    "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
                    mode->name, crtc->base.id, crtc->name, state);
     } else {
         memset(&state->mode, 0, sizeof(state->mode));
         state->enable = false;
         drm_dbg_atomic(crtc->dev,
                    "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
                    crtc->base.id, crtc->name, state);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 
 /**
  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
  * @state: the CRTC whose incoming state to update
  * @blob: pointer to blob property to use for mode
  *
  * Set a mode (originating from a blob property) on the desired CRTC state.
  * This function will take a reference on the blob property for the CRTC state,
  * and release the reference held on the state's existing mode property, if any
  * was set.
  *
  * RETURNS:
  * Zero on success, error code on failure. Cannot return -EDEADLK.
  */
 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
                       struct drm_property_blob *blob)
 {
     struct drm_crtc *crtc = state->crtc;
 
     if (blob == state->mode_blob)
         return 0;
 
     drm_property_blob_put(state->mode_blob);
     state->mode_blob = NULL;
 
     memset(&state->mode, 0, sizeof(state->mode));
 
     if (blob) {
         int ret;
 
         if (blob->length != sizeof(struct drm_mode_modeinfo)) {
             drm_dbg_atomic(crtc->dev,
                        "[CRTC:%d:%s] bad mode blob length: %zu\n",
                        crtc->base.id, crtc->name,
                        blob->length);
             return -EINVAL;
         }
 
         ret = drm_mode_convert_umode(crtc->dev,
                          &state->mode, blob->data);
         if (ret) {
             drm_dbg_atomic(crtc->dev,
                        "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
                        crtc->base.id, crtc->name,
                        ret, drm_get_mode_status_name(state->mode.status));
             drm_mode_debug_printmodeline(&state->mode);
             return -EINVAL;
         }
 
         state->mode_blob = drm_property_blob_get(blob);
         state->enable = true;
         drm_dbg_atomic(crtc->dev,
                    "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
                    state->mode.name, crtc->base.id, crtc->name,
                    state);
     } else {
         state->enable = false;
         drm_dbg_atomic(crtc->dev,
                    "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
                    crtc->base.id, crtc->name, state);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 
 /**
  * drm_atomic_set_crtc_for_plane - set CRTC for plane
  * @plane_state: the plane whose incoming state to update
  * @crtc: CRTC to use for the plane
  *
  * Changing the assigned CRTC for a plane requires us to grab the lock and state
  * for the new CRTC, as needed. This function takes care of all these details
  * besides updating the pointer in the state object itself.
  *
  * Returns:
  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
  * then the w/w mutex code has detected a deadlock and the entire atomic
  * sequence must be restarted. All other errors are fatal.
  */
 int
 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
                   struct drm_crtc *crtc)
 {
     struct drm_plane *plane = plane_state->plane;
     struct drm_crtc_state *crtc_state;
     /* Nothing to do for same crtc*/
     if (plane_state->crtc == crtc)
         return 0;
     if (plane_state->crtc) {
         crtc_state = drm_atomic_get_crtc_state(plane_state->state,
                                plane_state->crtc);
         if (WARN_ON(IS_ERR(crtc_state)))
             return PTR_ERR(crtc_state);
 
         crtc_state->plane_mask &= ~drm_plane_mask(plane);
     }
 
     plane_state->crtc = crtc;
 
     if (crtc) {
         crtc_state = drm_atomic_get_crtc_state(plane_state->state,
                                crtc);
         if (IS_ERR(crtc_state))
             return PTR_ERR(crtc_state);
         crtc_state->plane_mask |= drm_plane_mask(plane);
     }
 
     if (crtc)
         drm_dbg_atomic(plane->dev,
                    "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
                    plane->base.id, plane->name, plane_state,
                    crtc->base.id, crtc->name);
     else
         drm_dbg_atomic(plane->dev,
                    "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
                    plane->base.id, plane->name, plane_state);
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 
 /**
  * drm_atomic_set_fb_for_plane - set framebuffer for plane
  * @plane_state: atomic state object for the plane
  * @fb: fb to use for the plane
  *
  * Changing the assigned framebuffer for a plane requires us to grab a reference
  * to the new fb and drop the reference to the old fb, if there is one. This
  * function takes care of all these details besides updating the pointer in the
  * state object itself.
  */
 void
 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
                 struct drm_framebuffer *fb)
 {
     struct drm_plane *plane = plane_state->plane;
 
     if (fb)
         drm_dbg_atomic(plane->dev,
                    "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
                    fb->base.id, plane->base.id, plane->name,
                    plane_state);
     else
         drm_dbg_atomic(plane->dev,
                    "Set [NOFB] for [PLANE:%d:%s] state %p\n",
                    plane->base.id, plane->name, plane_state);
 
     drm_framebuffer_assign(&plane_state->fb, fb);
 }
 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 
 /**
  * drm_atomic_set_crtc_for_connector - set CRTC for connector
  * @conn_state: atomic state object for the connector
  * @crtc: CRTC to use for the connector
  *
  * Changing the assigned CRTC for a connector requires us to grab the lock and
  * state for the new CRTC, as needed. This function takes care of all these
  * details besides updating the pointer in the state object itself.
  *
  * Returns:
  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
  * then the w/w mutex code has detected a deadlock and the entire atomic
  * sequence must be restarted. All other errors are fatal.
  */
 int
 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
                   struct drm_crtc *crtc)
 {
     struct drm_connector *connector = conn_state->connector;
     struct drm_crtc_state *crtc_state;
 
     if (conn_state->crtc == crtc)
         return 0;
 
     if (conn_state->crtc) {
         crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
                                conn_state->crtc);
 
         crtc_state->connector_mask &=
             ~drm_connector_mask(conn_state->connector);
 
         drm_connector_put(conn_state->connector);
         conn_state->crtc = NULL;
     }
 
     if (crtc) {
         crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
         if (IS_ERR(crtc_state))
             return PTR_ERR(crtc_state);
 
         crtc_state->connector_mask |=
             drm_connector_mask(conn_state->connector);
 
         drm_connector_get(conn_state->connector);
         conn_state->crtc = crtc;
 
         drm_dbg_atomic(connector->dev,
                    "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
                    connector->base.id, connector->name,
                    conn_state, crtc->base.id, crtc->name);
     } else {
         drm_dbg_atomic(connector->dev,
                    "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
                    connector->base.id, connector->name,
                    conn_state);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 
 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 {
     state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 }
 
 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
                       struct drm_crtc *crtc)
 {
     s32 __user *fence_ptr;
 
     fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
     state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 
     return fence_ptr;
 }
 
 static int set_out_fence_for_connector(struct drm_atomic_state *state,
                     struct drm_connector *connector,
                     s32 __user *fence_ptr)
 {
     unsigned int index = drm_connector_index(connector);
 
     if (!fence_ptr)
         return 0;
 
     if (put_user(-1, fence_ptr))
         return -EFAULT;
 
     state->connectors[index].out_fence_ptr = fence_ptr;
 
     return 0;
 }
 
 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
                            struct drm_connector *connector)
 {
     unsigned int index = drm_connector_index(connector);
     s32 __user *fence_ptr;
 
     fence_ptr = state->connectors[index].out_fence_ptr;
     state->connectors[index].out_fence_ptr = NULL;
 
     return fence_ptr;
 }
 
 static int
 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
                      struct drm_property_blob **blob,
                      uint64_t blob_id,
                      ssize_t expected_size,
                      ssize_t expected_elem_size,
                      bool *replaced)
 {
     struct drm_property_blob *new_blob = NULL;
 
     if (blob_id != 0) {
         new_blob = drm_property_lookup_blob(dev, blob_id);
         if (new_blob == NULL)
             return -EINVAL;
 
         if (expected_size > 0 &&
             new_blob->length != expected_size) {
             drm_property_blob_put(new_blob);
             return -EINVAL;
         }
         if (expected_elem_size > 0 &&
             new_blob->length % expected_elem_size != 0) {
             drm_property_blob_put(new_blob);
             return -EINVAL;
         }
     }
 
     *replaced |= drm_property_replace_blob(blob, new_blob);
     drm_property_blob_put(new_blob);
 
     return 0;
 }
 
 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
         struct drm_crtc_state *state, struct drm_property *property,
         uint64_t val)
 {
     struct drm_device *dev = crtc->dev;
     struct drm_mode_config *config = &dev->mode_config;
     bool replaced = false;
     int ret;
 
     if (property == config->prop_active)
         state->active = val;
     else if (property == config->prop_mode_id) {
         struct drm_property_blob *mode =
             drm_property_lookup_blob(dev, val);
         ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
         drm_property_blob_put(mode);
         return ret;
     } else if (property == config->prop_vrr_enabled) {
         state->vrr_enabled = val;
     } else if (property == config->degamma_lut_property) {
         ret = drm_atomic_replace_property_blob_from_id(dev,
                     &state->degamma_lut,
                     val,
                     -1, sizeof(struct drm_color_lut),
                     &replaced);
         state->color_mgmt_changed |= replaced;
         return ret;
     } else if (property == config->ctm_property) {
         ret = drm_atomic_replace_property_blob_from_id(dev,
                     &state->ctm,
                     val,
                     sizeof(struct drm_color_ctm), -1,
                     &replaced);
         state->color_mgmt_changed |= replaced;
         return ret;
     } else if (property == config->gamma_lut_property) {
         ret = drm_atomic_replace_property_blob_from_id(dev,
                     &state->gamma_lut,
                     val,
                     -1, sizeof(struct drm_color_lut),
                     &replaced);
         state->color_mgmt_changed |= replaced;
         return ret;
     } else if (property == config->prop_out_fence_ptr) {
         s32 __user *fence_ptr = u64_to_user_ptr(val);
 
         if (!fence_ptr)
             return 0;
 
         if (put_user(-1, fence_ptr))
             return -EFAULT;
 
         set_out_fence_for_crtc(state->state, crtc, fence_ptr);
     } else if (property == crtc->scaling_filter_property) {
         state->scaling_filter = val;
     } else if (crtc->funcs->atomic_set_property) {
         return crtc->funcs->atomic_set_property(crtc, state, property, val);
     } else {
         drm_dbg_atomic(crtc->dev,
                    "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
                    crtc->base.id, crtc->name,
                    property->base.id, property->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int
 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
         const struct drm_crtc_state *state,
         struct drm_property *property, uint64_t *val)
 {
     struct drm_device *dev = crtc->dev;
     struct drm_mode_config *config = &dev->mode_config;
 
     if (property == config->prop_active)
         *val = drm_atomic_crtc_effectively_active(state);
     else if (property == config->prop_mode_id)
         *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
     else if (property == config->prop_vrr_enabled)
         *val = state->vrr_enabled;
     else if (property == config->degamma_lut_property)
         *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
     else if (property == config->ctm_property)
         *val = (state->ctm) ? state->ctm->base.id : 0;
     else if (property == config->gamma_lut_property)
         *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
     else if (property == config->prop_out_fence_ptr)
         *val = 0;
     else if (property == crtc->scaling_filter_property)
         *val = state->scaling_filter;
     else if (crtc->funcs->atomic_get_property)
         return crtc->funcs->atomic_get_property(crtc, state, property, val);
     else
         return -EINVAL;
 
     return 0;
 }
 
 static int drm_atomic_plane_set_property(struct drm_plane *plane,
         struct drm_plane_state *state, struct drm_file *file_priv,
         struct drm_property *property, uint64_t val)
 {
     struct drm_device *dev = plane->dev;
     struct drm_mode_config *config = &dev->mode_config;
     bool replaced = false;
     int ret;
 
     if (property == config->prop_fb_id) {
         struct drm_framebuffer *fb;
 
         fb = drm_framebuffer_lookup(dev, file_priv, val);
         drm_atomic_set_fb_for_plane(state, fb);
         if (fb)
             drm_framebuffer_put(fb);
     } else if (property == config->prop_in_fence_fd) {
         if (state->fence)
             return -EINVAL;
 
         if (U642I64(val) == -1)
             return 0;
 
         state->fence = sync_file_get_fence(val);
         if (!state->fence)
             return -EINVAL;
 
     } else if (property == config->prop_crtc_id) {
         struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 
         if (val && !crtc)
             return -EACCES;
         return drm_atomic_set_crtc_for_plane(state, crtc);
     } else if (property == config->prop_crtc_x) {
         state->crtc_x = U642I64(val);
     } else if (property == config->prop_crtc_y) {
         state->crtc_y = U642I64(val);
     } else if (property == config->prop_crtc_w) {
         state->crtc_w = val;
     } else if (property == config->prop_crtc_h) {
         state->crtc_h = val;
     } else if (property == config->prop_src_x) {
         state->src_x = val;
     } else if (property == config->prop_src_y) {
         state->src_y = val;
     } else if (property == config->prop_src_w) {
         state->src_w = val;
     } else if (property == config->prop_src_h) {
         state->src_h = val;
     } else if (property == plane->alpha_property) {
         state->alpha = val;
     } else if (property == plane->blend_mode_property) {
         state->pixel_blend_mode = val;
     } else if (property == plane->rotation_property) {
         if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
             drm_dbg_atomic(plane->dev,
                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
                        plane->base.id, plane->name, val);
             return -EINVAL;
         }
         state->rotation = val;
     } else if (property == plane->zpos_property) {
         state->zpos = val;
     } else if (property == plane->color_encoding_property) {
         state->color_encoding = val;
     } else if (property == plane->color_range_property) {
         state->color_range = val;
     } else if (property == config->prop_fb_damage_clips) {
         ret = drm_atomic_replace_property_blob_from_id(dev,
                     &state->fb_damage_clips,
                     val,
                     -1,
                     sizeof(struct drm_rect),
                     &replaced);
         return ret;
     } else if (property == plane->scaling_filter_property) {
         state->scaling_filter = val;
     } else if (plane->funcs->atomic_set_property) {
         return plane->funcs->atomic_set_property(plane, state,
                 property, val);
     } else {
         drm_dbg_atomic(plane->dev,
                    "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
                    plane->base.id, plane->name,
                    property->base.id, property->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int
 drm_atomic_plane_get_property(struct drm_plane *plane,
         const struct drm_plane_state *state,
         struct drm_property *property, uint64_t *val)
 {
     struct drm_device *dev = plane->dev;
     struct drm_mode_config *config = &dev->mode_config;
 
     if (property == config->prop_fb_id) {
         *val = (state->fb) ? state->fb->base.id : 0;
     } else if (property == config->prop_in_fence_fd) {
         *val = -1;
     } else if (property == config->prop_crtc_id) {
         *val = (state->crtc) ? state->crtc->base.id : 0;
     } else if (property == config->prop_crtc_x) {
         *val = I642U64(state->crtc_x);
     } else if (property == config->prop_crtc_y) {
         *val = I642U64(state->crtc_y);
     } else if (property == config->prop_crtc_w) {
         *val = state->crtc_w;
     } else if (property == config->prop_crtc_h) {
         *val = state->crtc_h;
     } else if (property == config->prop_src_x) {
         *val = state->src_x;
     } else if (property == config->prop_src_y) {
         *val = state->src_y;
     } else if (property == config->prop_src_w) {
         *val = state->src_w;
     } else if (property == config->prop_src_h) {
         *val = state->src_h;
     } else if (property == plane->alpha_property) {
         *val = state->alpha;
     } else if (property == plane->blend_mode_property) {
         *val = state->pixel_blend_mode;
     } else if (property == plane->rotation_property) {
         *val = state->rotation;
     } else if (property == plane->zpos_property) {
         *val = state->zpos;
     } else if (property == plane->color_encoding_property) {
         *val = state->color_encoding;
     } else if (property == plane->color_range_property) {
         *val = state->color_range;
     } else if (property == config->prop_fb_damage_clips) {
         *val = (state->fb_damage_clips) ?
             state->fb_damage_clips->base.id : 0;
     } else if (property == plane->scaling_filter_property) {
         *val = state->scaling_filter;
     } else if (plane->funcs->atomic_get_property) {
         return plane->funcs->atomic_get_property(plane, state, property, val);
     } else {
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int drm_atomic_set_writeback_fb_for_connector(
         struct drm_connector_state *conn_state,
         struct drm_framebuffer *fb)
 {
     int ret;
     struct drm_connector *conn = conn_state->connector;
 
     ret = drm_writeback_set_fb(conn_state, fb);
     if (ret < 0)
         return ret;
 
     if (fb)
         drm_dbg_atomic(conn->dev,
                    "Set [FB:%d] for connector state %p\n",
                    fb->base.id, conn_state);
     else
         drm_dbg_atomic(conn->dev,
                    "Set [NOFB] for connector state %p\n",
                    conn_state);
 
     return 0;
 }
 
 static int drm_atomic_connector_set_property(struct drm_connector *connector,
         struct drm_connector_state *state, struct drm_file *file_priv,
         struct drm_property *property, uint64_t val)
 {
     struct drm_device *dev = connector->dev;
     struct drm_mode_config *config = &dev->mode_config;
     bool replaced = false;
     int ret;
 
     if (property == config->prop_crtc_id) {
         struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 
         if (val && !crtc)
             return -EACCES;
         return drm_atomic_set_crtc_for_connector(state, crtc);
     } else if (property == config->dpms_property) {
         /* setting DPMS property requires special handling, which
          * is done in legacy setprop path for us.  Disallow (for
          * now?) atomic writes to DPMS property:
          */
         return -EINVAL;
     } else if (property == config->tv_select_subconnector_property) {
         state->tv.subconnector = val;
     } else if (property == config->tv_left_margin_property) {
         state->tv.margins.left = val;
     } else if (property == config->tv_right_margin_property) {
         state->tv.margins.right = val;
     } else if (property == config->tv_top_margin_property) {
         state->tv.margins.top = val;
     } else if (property == config->tv_bottom_margin_property) {
         state->tv.margins.bottom = val;
     } else if (property == config->tv_mode_property) {
         state->tv.mode = val;
     } else if (property == config->tv_brightness_property) {
         state->tv.brightness = val;
     } else if (property == config->tv_contrast_property) {
         state->tv.contrast = val;
     } else if (property == config->tv_flicker_reduction_property) {
         state->tv.flicker_reduction = val;
     } else if (property == config->tv_overscan_property) {
         state->tv.overscan = val;
     } else if (property == config->tv_saturation_property) {
         state->tv.saturation = val;
     } else if (property == config->tv_hue_property) {
         state->tv.hue = val;
     } else if (property == config->link_status_property) {
         /* Never downgrade from GOOD to BAD on userspace's request here,
          * only hw issues can do that.
          *
          * For an atomic property the userspace doesn't need to be able
          * to understand all the properties, but needs to be able to
          * restore the state it wants on VT switch. So if the userspace
          * tries to change the link_status from GOOD to BAD, driver
          * silently rejects it and returns a 0. This prevents userspace
          * from accidentally breaking  the display when it restores the
          * state.
          */
         if (state->link_status != DRM_LINK_STATUS_GOOD)
             state->link_status = val;
     } else if (property == config->hdr_output_metadata_property) {
         ret = drm_atomic_replace_property_blob_from_id(dev,
                 &state->hdr_output_metadata,
                 val,
                 sizeof(struct hdr_output_metadata), -1,
                 &replaced);
         return ret;
     } else if (property == config->aspect_ratio_property) {
         state->picture_aspect_ratio = val;
     } else if (property == config->content_type_property) {
         state->content_type = val;
     } else if (property == connector->scaling_mode_property) {
         state->scaling_mode = val;
     } else if (property == config->content_protection_property) {
         if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
             drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
             return -EINVAL;
         }
         state->content_protection = val;
     } else if (property == config->hdcp_content_type_property) {
         state->hdcp_content_type = val;
     } else if (property == connector->colorspace_property) {
         state->colorspace = val;
     } else if (property == config->writeback_fb_id_property) {
         struct drm_framebuffer *fb;
         int ret;
 
         fb = drm_framebuffer_lookup(dev, file_priv, val);
         ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
         if (fb)
             drm_framebuffer_put(fb);
         return ret;
     } else if (property == config->writeback_out_fence_ptr_property) {
         s32 __user *fence_ptr = u64_to_user_ptr(val);
 
         return set_out_fence_for_connector(state->state, connector,
                            fence_ptr);
     } else if (property == connector->max_bpc_property) {
         state->max_requested_bpc = val;
     } else if (property == connector->privacy_screen_sw_state_property) {
         state->privacy_screen_sw_state = val;
     } else if (connector->funcs->atomic_set_property) {
         return connector->funcs->atomic_set_property(connector,
                 state, property, val);
     } else {
         drm_dbg_atomic(connector->dev,
                    "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
                    connector->base.id, connector->name,
                    property->base.id, property->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int
 drm_atomic_connector_get_property(struct drm_connector *connector,
         const struct drm_connector_state *state,
         struct drm_property *property, uint64_t *val)
 {
     struct drm_device *dev = connector->dev;
     struct drm_mode_config *config = &dev->mode_config;
 
     if (property == config->prop_crtc_id) {
         *val = (state->crtc) ? state->crtc->base.id : 0;
     } else if (property == config->dpms_property) {
         if (state->crtc && state->crtc->state->self_refresh_active)
             *val = DRM_MODE_DPMS_ON;
         else
             *val = connector->dpms;
     } else if (property == config->tv_select_subconnector_property) {
         *val = state->tv.subconnector;
     } else if (property == config->tv_left_margin_property) {
         *val = state->tv.margins.left;
     } else if (property == config->tv_right_margin_property) {
         *val = state->tv.margins.right;
     } else if (property == config->tv_top_margin_property) {
         *val = state->tv.margins.top;
     } else if (property == config->tv_bottom_margin_property) {
         *val = state->tv.margins.bottom;
     } else if (property == config->tv_mode_property) {
         *val = state->tv.mode;
     } else if (property == config->tv_brightness_property) {
         *val = state->tv.brightness;
     } else if (property == config->tv_contrast_property) {
         *val = state->tv.contrast;
     } else if (property == config->tv_flicker_reduction_property) {
         *val = state->tv.flicker_reduction;
     } else if (property == config->tv_overscan_property) {
         *val = state->tv.overscan;
     } else if (property == config->tv_saturation_property) {
         *val = state->tv.saturation;
     } else if (property == config->tv_hue_property) {
         *val = state->tv.hue;
     } else if (property == config->link_status_property) {
         *val = state->link_status;
     } else if (property == config->aspect_ratio_property) {
         *val = state->picture_aspect_ratio;
     } else if (property == config->content_type_property) {
         *val = state->content_type;
     } else if (property == connector->colorspace_property) {
         *val = state->colorspace;
     } else if (property == connector->scaling_mode_property) {
         *val = state->scaling_mode;
     } else if (property == config->hdr_output_metadata_property) {
         *val = state->hdr_output_metadata ?
             state->hdr_output_metadata->base.id : 0;
     } else if (property == config->content_protection_property) {
         *val = state->content_protection;
     } else if (property == config->hdcp_content_type_property) {
         *val = state->hdcp_content_type;
     } else if (property == config->writeback_fb_id_property) {
         /* Writeback framebuffer is one-shot, write and forget */
         *val = 0;
     } else if (property == config->writeback_out_fence_ptr_property) {
         *val = 0;
     } else if (property == connector->max_bpc_property) {
         *val = state->max_requested_bpc;
     } else if (property == connector->privacy_screen_sw_state_property) {
         *val = state->privacy_screen_sw_state;
     } else if (connector->funcs->atomic_get_property) {
         return connector->funcs->atomic_get_property(connector,
                 state, property, val);
     } else {
         return -EINVAL;
     }
 
     return 0;
 }
 
 int drm_atomic_get_property(struct drm_mode_object *obj,
         struct drm_property *property, uint64_t *val)
 {
     struct drm_device *dev = property->dev;
     int ret;
 
     switch (obj->type) {
     case DRM_MODE_OBJECT_CONNECTOR: {
         struct drm_connector *connector = obj_to_connector(obj);
 
         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
         ret = drm_atomic_connector_get_property(connector,
                 connector->state, property, val);
         break;
     }
     case DRM_MODE_OBJECT_CRTC: {
         struct drm_crtc *crtc = obj_to_crtc(obj);
 
         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
         ret = drm_atomic_crtc_get_property(crtc,
                 crtc->state, property, val);
         break;
     }
     case DRM_MODE_OBJECT_PLANE: {
         struct drm_plane *plane = obj_to_plane(obj);
 
         WARN_ON(!drm_modeset_is_locked(&plane->mutex));
         ret = drm_atomic_plane_get_property(plane,
                 plane->state, property, val);
         break;
     }
     default:
         ret = -EINVAL;
         break;
     }
 
     return ret;
 }
 
 /*
  * The big monster ioctl
  */
 
 static struct drm_pending_vblank_event *create_vblank_event(
         struct drm_crtc *crtc, uint64_t user_data)
 {
     struct drm_pending_vblank_event *e = NULL;
 
     e = kzalloc(sizeof *e, GFP_KERNEL);
     if (!e)
         return NULL;
 
     e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
     e->event.base.length = sizeof(e->event);
     e->event.vbl.crtc_id = crtc->base.id;
     e->event.vbl.user_data = user_data;
 
     return e;
 }
 
 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
                      struct drm_connector *connector,
                      int mode)
 {
     struct drm_connector *tmp_connector;
     struct drm_connector_state *new_conn_state;
     struct drm_crtc *crtc;
     struct drm_crtc_state *crtc_state;
     int i, ret, old_mode = connector->dpms;
     bool active = false;
 
     ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
                    state->acquire_ctx);
     if (ret)
         return ret;
 
     if (mode != DRM_MODE_DPMS_ON)
         mode = DRM_MODE_DPMS_OFF;
     connector->dpms = mode;
 
     crtc = connector->state->crtc;
     if (!crtc)
         goto out;
     ret = drm_atomic_add_affected_connectors(state, crtc);
     if (ret)
         goto out;
 
     crtc_state = drm_atomic_get_crtc_state(state, crtc);
     if (IS_ERR(crtc_state)) {
         ret = PTR_ERR(crtc_state);
         goto out;
     }
 
     for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
         if (new_conn_state->crtc != crtc)
             continue;
         if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
             active = true;
             break;
         }
     }
 
     crtc_state->active = active;
     ret = drm_atomic_commit(state);
 out:
     if (ret != 0)
         connector->dpms = old_mode;
     return ret;
 }
 
 int drm_atomic_set_property(struct drm_atomic_state *state,
                 struct drm_file *file_priv,
                 struct drm_mode_object *obj,
                 struct drm_property *prop,
                 uint64_t prop_value)
 {
     struct drm_mode_object *ref;
     int ret;
 
     if (!drm_property_change_valid_get(prop, prop_value, &ref))
         return -EINVAL;
 
     switch (obj->type) {
     case DRM_MODE_OBJECT_CONNECTOR: {
         struct drm_connector *connector = obj_to_connector(obj);
         struct drm_connector_state *connector_state;
 
         connector_state = drm_atomic_get_connector_state(state, connector);
         if (IS_ERR(connector_state)) {
             ret = PTR_ERR(connector_state);
             break;
         }
 
         ret = drm_atomic_connector_set_property(connector,
                 connector_state, file_priv,
                 prop, prop_value);
         break;
     }
     case DRM_MODE_OBJECT_CRTC: {
         struct drm_crtc *crtc = obj_to_crtc(obj);
         struct drm_crtc_state *crtc_state;
 
         crtc_state = drm_atomic_get_crtc_state(state, crtc);
         if (IS_ERR(crtc_state)) {
             ret = PTR_ERR(crtc_state);
             break;
         }
 
         ret = drm_atomic_crtc_set_property(crtc,
                 crtc_state, prop, prop_value);
         break;
     }
     case DRM_MODE_OBJECT_PLANE: {
         struct drm_plane *plane = obj_to_plane(obj);
         struct drm_plane_state *plane_state;
 
         plane_state = drm_atomic_get_plane_state(state, plane);
         if (IS_ERR(plane_state)) {
             ret = PTR_ERR(plane_state);
             break;
         }
 
         ret = drm_atomic_plane_set_property(plane,
                 plane_state, file_priv,
                 prop, prop_value);
         break;
     }
     default:
         ret = -EINVAL;
         break;
     }
 
     drm_property_change_valid_put(prop, ref);
     return ret;
 }
 
 /**
  * DOC: explicit fencing properties
  *
  * Explicit fencing allows userspace to control the buffer synchronization
  * between devices. A Fence or a group of fences are transferred to/from
  * userspace using Sync File fds and there are two DRM properties for that.
  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
  *
  * As a contrast, with implicit fencing the kernel keeps track of any
  * ongoing rendering, and automatically ensures that the atomic update waits
  * for any pending rendering to complete. This is usually tracked in &struct
  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
  * fencing is what Android wants.
  *
  * "IN_FENCE_FD”:
  *  Use this property to pass a fence that DRM should wait on before
  *  proceeding with the Atomic Commit request and show the framebuffer for
  *  the plane on the screen. The fence can be either a normal fence or a
  *  merged one, the sync_file framework will handle both cases and use a
  *  fence_array if a merged fence is received. Passing -1 here means no
  *  fences to wait on.
  *
  *  If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
  *  it will only check if the Sync File is a valid one.
  *
  *  On the driver side the fence is stored on the @fence parameter of
  *  &struct drm_plane_state. Drivers which also support implicit fencing
  *  should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
  *  to make sure there's consistent behaviour between drivers in precedence
  *  of implicit vs. explicit fencing.
  *
  * "OUT_FENCE_PTR”:
  *  Use this property to pass a file descriptor pointer to DRM. Once the
  *  Atomic Commit request call returns OUT_FENCE_PTR will be filled with
  *  the file descriptor number of a Sync File. This Sync File contains the
  *  CRTC fence that will be signaled when all framebuffers present on the
  *  Atomic Commit * request for that given CRTC are scanned out on the
  *  screen.
  *
  *  The Atomic Commit request fails if a invalid pointer is passed. If the
  *  Atomic Commit request fails for any other reason the out fence fd
  *  returned will be -1. On a Atomic Commit with the
  *  DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
  *
  *  Note that out-fences don't have a special interface to drivers and are
  *  internally represented by a &struct drm_pending_vblank_event in struct
  *  &drm_crtc_state, which is also used by the nonblocking atomic commit
  *  helpers and for the DRM event handling for existing userspace.
  */
 
 struct drm_out_fence_state {
     s32 __user *out_fence_ptr;
     struct sync_file *sync_file;
     int fd;
 };
 
 static int setup_out_fence(struct drm_out_fence_state *fence_state,
                struct dma_fence *fence)
 {
     fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
     if (fence_state->fd < 0)
         return fence_state->fd;
 
     if (put_user(fence_state->fd, fence_state->out_fence_ptr))
         return -EFAULT;
 
     fence_state->sync_file = sync_file_create(fence);
     if (!fence_state->sync_file)
         return -ENOMEM;
 
     return 0;
 }
 
 static int prepare_signaling(struct drm_device *dev,
                   struct drm_atomic_state *state,
                   struct drm_mode_atomic *arg,
                   struct drm_file *file_priv,
                   struct drm_out_fence_state **fence_state,
                   unsigned int *num_fences)
 {
     struct drm_crtc *crtc;
     struct drm_crtc_state *crtc_state;
     struct drm_connector *conn;
     struct drm_connector_state *conn_state;
     int i, c = 0, ret;
 
     if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
         return 0;
 
     for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
         s32 __user *fence_ptr;
 
         fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
 
         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
             struct drm_pending_vblank_event *e;
 
             e = create_vblank_event(crtc, arg->user_data);
             if (!e)
                 return -ENOMEM;
 
             crtc_state->event = e;
         }
 
         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
             struct drm_pending_vblank_event *e = crtc_state->event;
 
             if (!file_priv)
                 continue;
 
             ret = drm_event_reserve_init(dev, file_priv, &e->base,
                              &e->event.base);
             if (ret) {
                 kfree(e);
                 crtc_state->event = NULL;
                 return ret;
             }
         }
 
         if (fence_ptr) {
             struct dma_fence *fence;
             struct drm_out_fence_state *f;
 
             f = krealloc(*fence_state, sizeof(**fence_state) *
                      (*num_fences + 1), GFP_KERNEL);
             if (!f)
                 return -ENOMEM;
 
             memset(&f[*num_fences], 0, sizeof(*f));
 
             f[*num_fences].out_fence_ptr = fence_ptr;
             *fence_state = f;
 
             fence = drm_crtc_create_fence(crtc);
             if (!fence)
                 return -ENOMEM;
 
             ret = setup_out_fence(&f[(*num_fences)++], fence);
             if (ret) {
                 dma_fence_put(fence);
                 return ret;
             }
 
             crtc_state->event->base.fence = fence;
         }
 
         c++;
     }
 
     for_each_new_connector_in_state(state, conn, conn_state, i) {
         struct drm_writeback_connector *wb_conn;
         struct drm_out_fence_state *f;
         struct dma_fence *fence;
         s32 __user *fence_ptr;
 
         if (!conn_state->writeback_job)
             continue;
 
         fence_ptr = get_out_fence_for_connector(state, conn);
         if (!fence_ptr)
             continue;
 
         f = krealloc(*fence_state, sizeof(**fence_state) *
                  (*num_fences + 1), GFP_KERNEL);
         if (!f)
             return -ENOMEM;
 
         memset(&f[*num_fences], 0, sizeof(*f));
 
         f[*num_fences].out_fence_ptr = fence_ptr;
         *fence_state = f;
 
         wb_conn = drm_connector_to_writeback(conn);
         fence = drm_writeback_get_out_fence(wb_conn);
         if (!fence)
             return -ENOMEM;
 
         ret = setup_out_fence(&f[(*num_fences)++], fence);
         if (ret) {
             dma_fence_put(fence);
             return ret;
         }
 
         conn_state->writeback_job->out_fence = fence;
     }
 
     /*
      * Having this flag means user mode pends on event which will never
      * reach due to lack of at least one CRTC for signaling
      */
     if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
         return -EINVAL;
 
     return 0;
 }
 
 static void complete_signaling(struct drm_device *dev,
                    struct drm_atomic_state *state,
                    struct drm_out_fence_state *fence_state,
                    unsigned int num_fences,
                    bool install_fds)
 {
     struct drm_crtc *crtc;
     struct drm_crtc_state *crtc_state;
     int i;
 
     if (install_fds) {
         for (i = 0; i < num_fences; i++)
             fd_install(fence_state[i].fd,
                    fence_state[i].sync_file->file);
 
         kfree(fence_state);
         return;
     }
 
     for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
         struct drm_pending_vblank_event *event = crtc_state->event;
         /*
          * Free the allocated event. drm_atomic_helper_setup_commit
          * can allocate an event too, so only free it if it's ours
          * to prevent a double free in drm_atomic_state_clear.
          */
         if (event && (event->base.fence || event->base.file_priv)) {
             drm_event_cancel_free(dev, &event->base);
             crtc_state->event = NULL;
         }
     }
 
     if (!fence_state)
         return;
 
     for (i = 0; i < num_fences; i++) {
         if (fence_state[i].sync_file)
             fput(fence_state[i].sync_file->file);
         if (fence_state[i].fd >= 0)
             put_unused_fd(fence_state[i].fd);
 
         /* If this fails log error to the user */
         if (fence_state[i].out_fence_ptr &&
             put_user(-1, fence_state[i].out_fence_ptr))
             drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
     }
 
     kfree(fence_state);
 }
 
 int drm_mode_atomic_ioctl(struct drm_device *dev,
               void *data, struct drm_file *file_priv)
 {
     struct drm_mode_atomic *arg = data;
     uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
     uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
     uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
     uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
     unsigned int copied_objs, copied_props;
     struct drm_atomic_state *state;
     struct drm_modeset_acquire_ctx ctx;
     struct drm_out_fence_state *fence_state;
     int ret = 0;
     unsigned int i, j, num_fences;
 
     /* disallow for drivers not supporting atomic: */
     if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
         return -EOPNOTSUPP;
 
     /* disallow for userspace that has not enabled atomic cap (even
      * though this may be a bit overkill, since legacy userspace
      * wouldn't know how to call this ioctl)
      */
     if (!file_priv->atomic) {
         drm_dbg_atomic(dev,
                    "commit failed: atomic cap not enabled\n");
         return -EINVAL;
     }
 
     if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
         drm_dbg_atomic(dev, "commit failed: invalid flag\n");
         return -EINVAL;
     }
 
     if (arg->reserved) {
         drm_dbg_atomic(dev, "commit failed: reserved field set\n");
         return -EINVAL;
     }
 
     if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
         drm_dbg_atomic(dev,
                    "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
         return -EINVAL;
     }
 
     /* can't test and expect an event at the same time. */
     if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
             (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
         drm_dbg_atomic(dev,
                    "commit failed: page-flip event requested with test-only commit\n");
         return -EINVAL;
     }
 
     state = drm_atomic_state_alloc(dev);
     if (!state)
         return -ENOMEM;
 
     drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
     state->acquire_ctx = &ctx;
     state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
 
 retry:
     copied_objs = 0;
     copied_props = 0;
     fence_state = NULL;
     num_fences = 0;
 
     for (i = 0; i < arg->count_objs; i++) {
         uint32_t obj_id, count_props;
         struct drm_mode_object *obj;
 
         if (get_user(obj_id, objs_ptr + copied_objs)) {
             ret = -EFAULT;
             goto out;
         }
 
         obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
         if (!obj) {
             ret = -ENOENT;
             goto out;
         }
 
         if (!obj->properties) {
             drm_mode_object_put(obj);
             ret = -ENOENT;
             goto out;
         }
 
         if (get_user(count_props, count_props_ptr + copied_objs)) {
             drm_mode_object_put(obj);
             ret = -EFAULT;
             goto out;
         }
 
         copied_objs++;
 
         for (j = 0; j < count_props; j++) {
             uint32_t prop_id;
             uint64_t prop_value;
             struct drm_property *prop;
 
             if (get_user(prop_id, props_ptr + copied_props)) {
                 drm_mode_object_put(obj);
                 ret = -EFAULT;
                 goto out;
             }
 
             prop = drm_mode_obj_find_prop_id(obj, prop_id);
             if (!prop) {
                 drm_mode_object_put(obj);
                 ret = -ENOENT;
                 goto out;
             }
 
             if (copy_from_user(&prop_value,
                        prop_values_ptr + copied_props,
                        sizeof(prop_value))) {
                 drm_mode_object_put(obj);
                 ret = -EFAULT;
                 goto out;
             }
 
             ret = drm_atomic_set_property(state, file_priv,
                               obj, prop, prop_value);
             if (ret) {
                 drm_mode_object_put(obj);
                 goto out;
             }
 
             copied_props++;
         }
 
         drm_mode_object_put(obj);
     }
 
     ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
                 &num_fences);
     if (ret)
         goto out;
 
     if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
         ret = drm_atomic_check_only(state);
     } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
         ret = drm_atomic_nonblocking_commit(state);
     } else {
         ret = drm_atomic_commit(state);
     }
 
 out:
     complete_signaling(dev, state, fence_state, num_fences, !ret);
 
     if (ret == -EDEADLK) {
         drm_atomic_state_clear(state);
         ret = drm_modeset_backoff(&ctx);
         if (!ret)
             goto retry;
     }
 
     drm_atomic_state_put(state);
 
     drm_modeset_drop_locks(&ctx);
     drm_modeset_acquire_fini(&ctx);
 
     return ret;
 }

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