Quelle  drm_atomic_uapi.c   Sprache: C

/*
 * 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.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.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/export.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 (%s, %pe): " DRM_MODE_FMT "\n",
           crtc->base.id, crtc->name,
           drm_get_mode_status_name(state->mode.status),
           ERR_PTR(ret), DRM_MODE_ARG(&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_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_property_replace_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_property_replace_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_property_replace_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 {
  drm_dbg_atomic(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_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) {
   drm_dbg_atomic(dev,
           "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
           property->base.id, property->name, val);
   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_property_replace_blob_from_id(dev,
     &state->fb_damage_clips,
     val,
     -1,
     sizeof(struct drm_mode_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 if (property == plane->hotspot_x_property) {
  if (plane->type != DRM_PLANE_TYPE_CURSOR) {
   drm_dbg_atomic(plane->dev,
           "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
           plane->base.id, plane->name, val);
   return -EINVAL;
  }
  state->hotspot_x = val;
 } else if (property == plane->hotspot_y_property) {
  if (plane->type != DRM_PLANE_TYPE_CURSOR) {
   drm_dbg_atomic(plane->dev,
           "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
           plane->base.id, plane->name, val);
   return -EINVAL;
  }
  state->hotspot_y = 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 if (property == plane->hotspot_x_property) {
  *val = state->hotspot_x;
 } else if (property == plane->hotspot_y_property) {
  *val = state->hotspot_y;
 } else {
  drm_dbg_atomic(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_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) {
   drm_dbg_atomic(dev,
           "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
           property->base.id, property->name, val);
   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:
 */
  drm_dbg_atomic(dev,
          "legacy [PROP:%d:%s] can only be set via legacy uAPI\n",
          property->base.id, property->name);
  return -EINVAL;
 } else if (property == config->tv_select_subconnector_property) {
  state->tv.select_subconnector = val;
 } else if (property == config->tv_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->legacy_tv_mode_property) {
  state->tv.legacy_mode = 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_property_replace_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 (property == connector->broadcast_rgb_property) {
  state->hdmi.broadcast_rgb = 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.select_subconnector;
 } else if (property == config->tv_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->legacy_tv_mode_property) {
  *val = state->tv.legacy_mode;
 } 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 (property == connector->broadcast_rgb_property) {
  *val = state->hdmi.broadcast_rgb;
 } else if (connector->funcs->atomic_get_property) {
  return connector->funcs->atomic_get_property(connector,
    state, property, val);
 } else {
  drm_dbg_atomic(dev,
          "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
          connector->base.id, connector->name,
          property->base.id, property->name);
  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:
  drm_dbg_atomic(dev, "[OBJECT:%d] has no properties\n", obj->id);
  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;

 if (connector->dpms == mode)
  goto out;

 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;
}

static int drm_atomic_check_prop_changes(int ret, uint64_t old_val, uint64_t prop_value,
      struct drm_property *prop)
{
 if (ret != 0 || old_val != prop_value) {
  drm_dbg_atomic(prop->dev,
          "[PROP:%d:%s] No prop can be changed during async flip\n",
          prop->base.id, prop->name);
  return -EINVAL;
 }

 return 0;
}

int drm_atomic_set_property(struct drm_atomic_state *state,
       struct drm_file *file_priv,
       struct drm_mode_object *obj,
       struct drm_property *prop,
       u64 prop_value,
       bool async_flip)
{
 struct drm_mode_object *ref;
 u64 old_val;
 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;
  }

  if (async_flip) {
   ret = drm_atomic_connector_get_property(connector, connector_state,
        prop, &old_val);
   ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
   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;
  }

  if (async_flip) {
   ret = drm_atomic_crtc_get_property(crtc, crtc_state,
          prop, &old_val);
   ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
   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;
  struct drm_mode_config *config = &plane->dev->mode_config;
  const struct drm_plane_helper_funcs *plane_funcs = plane->helper_private;

  plane_state = drm_atomic_get_plane_state(state, plane);
  if (IS_ERR(plane_state)) {
   ret = PTR_ERR(plane_state);
   break;
  }

  if (async_flip) {
   /* no-op changes are always allowed */
   ret = drm_atomic_plane_get_property(plane, plane_state,
           prop, &old_val);
   ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);

   /* fail everything that isn't no-op or a pure flip */
   if (ret && prop != config->prop_fb_id &&
       prop != config->prop_in_fence_fd &&
       prop != config->prop_fb_damage_clips) {
    break;
   }

   if (ret && plane->type != DRM_PLANE_TYPE_PRIMARY) {
    /* ask the driver if this non-primary plane is supported */
    if (plane_funcs && plane_funcs->atomic_async_check)
     ret = plane_funcs->atomic_async_check(plane, state, true);

    if (ret) {
     drm_dbg_atomic(prop->dev,
             "[PLANE:%d:%s] does not support async flips\n",
             obj->id, plane->name);
     break;
    }
   }
  }

  ret = drm_atomic_plane_set_property(plane,
    plane_state, file_priv,
    prop, prop_value);
  break;
 }
 default:
  drm_dbg_atomic(prop->dev, "[OBJECT:%d] has no properties\n", obj->id);
  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)) {
  drm_dbg_atomic(dev, "need at least one CRTC for 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);
}

static void
set_async_flip(struct drm_atomic_state *state)
{
 struct drm_crtc *crtc;
 struct drm_crtc_state *crtc_state;
 int i;

 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
  crtc_state->async_flip = true;
 }
}

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;
 bool async_flip = false;

 /* 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) {
  if (!dev->mode_config.async_page_flip) {
   drm_dbg_atomic(dev,
           "commit failed: DRM_MODE_PAGE_FLIP_ASYNC not supported\n");
   return -EINVAL;
  }

  async_flip = true;
 }

 /* 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) {
   drm_dbg_atomic(dev, "cannot find object ID %d", obj_id);
   ret = -ENOENT;
   goto out;
  }

  if (!obj->properties) {
   drm_dbg_atomic(dev, "[OBJECT:%d] has no properties", obj_id);
   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_dbg_atomic(dev,
            "[OBJECT:%d] cannot find property ID %d",
            obj_id, prop_id);
    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, async_flip);
   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_PAGE_FLIP_ASYNC)
  set_async_flip(state);

 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;
}