// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "ui/ozone/platform/drm/host/drm_display_host_manager.h"

#include <fcntl.h>
#include <stddef.h>
#include <xf86drm.h>

#include <memory>
#include <utility>

#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "base/threading/thread_restrictions.h"
#include "base/trace_event/trace_event.h"
#include "ui/display/types/display_configuration_params.h"
#include "ui/display/types/display_snapshot.h"
#include "ui/events/ozone/device/device_event.h"
#include "ui/events/ozone/device/device_manager.h"
#include "ui/ozone/platform/drm/common/drm_util.h"
#include "ui/ozone/platform/drm/common/drm_wrapper.h"
#include "ui/ozone/platform/drm/common/hardware_display_controller_info.h"
#include "ui/ozone/platform/drm/host/drm_display_host.h"
#include "ui/ozone/platform/drm/host/drm_native_display_delegate.h"
#include "ui/ozone/platform/drm/host/gpu_thread_adapter.h"

namespace ui {

namespace {

constexpr int kDriverReadySleepMs = 100;

typedef base::OnceCallback<void(const base::FilePath&,
                                const base::FilePath&,
                                std::unique_ptr<DrmWrapper>)>
    OnOpenDeviceReplyCallback;

const char kDefaultGraphicsCardPattern[] = "/dev/dri/card%d";

// Sleep this many milliseconds before retrying after authentication fails.
const int kAuthFailSleepMs = 100;

// Log a warning after failing to authenticate for this many milliseconds.
const int kLogAuthFailDelayMs = 1000;

const char* kDisplayActionString[] = {
    "ADD",
    "REMOVE",
    "CHANGE",
};

// Find sysfs device path for the given device path.
base::FilePath MapDevPathToSysPath(const base::FilePath& device_path) {
  // |device_path| looks something like /dev/dri/card0. We take the basename of
  // that (card0) and append it to /sys/class/drm. /sys/class/drm/card0 is a
  // symlink that points to something like
  // /sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/drm/card0, which exposes
  // some metadata about the attached device.
  base::FilePath sys_path = base::MakeAbsoluteFilePath(
      base::FilePath("/sys/class/drm").Append(device_path.BaseName()));

  base::FilePath path_thus_far;
  for (const auto& component : sys_path.GetComponents()) {
    if (path_thus_far.empty()) {
      path_thus_far = base::FilePath(component);
    } else {
      path_thus_far = path_thus_far.Append(component);
    }

    // Newer versions of the EVDI kernel driver include a symlink to the USB
    // device in the sysfs EVDI directory (e.g.
    // /sys/devices/platform/evdi.0/device) for EVDI displays that are USB. If
    // that symlink exists, read it, and use that path as the sysfs path for the
    // display when calculating the association score to match it with a
    // corresponding USB touch device. If the symlink doesn't exist, use the
    // normal sysfs path. In order to ensure that the sysfs path remains unique,
    // append the card name to it.
    if (component.starts_with("evdi")) {
      base::FilePath usb_device_path;
      if (base::ReadSymbolicLink(path_thus_far.Append("device"),
                                 &usb_device_path)) {
        return base::MakeAbsoluteFilePath(path_thus_far.Append(usb_device_path))
            .Append(device_path.BaseName());
      }
      break;
    }
  }

  return sys_path;
}

std::unique_ptr<DrmWrapper> OpenDrmDevice(const base::FilePath& dev_path,
                                          const base::FilePath& sys_path,
                                          bool is_primary_device) {
  // Security folks have requested that we assert the graphics device has the
  // expected path, so use a CHECK instead of a DCHECK. The sys_path is only
  // used a label and is otherwise unvalidated.
  CHECK(dev_path.DirName() == base::FilePath("/dev/dri"));
  base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
                                                base::BlockingType::MAY_BLOCK);

  base::ScopedFD scoped_fd;
  int num_auth_attempts = 0;
  const base::TimeTicks start_time = base::TimeTicks::Now();
  while (true) {
    scoped_fd.reset();
    int fd = HANDLE_EINTR(open(dev_path.value().c_str(), O_RDWR | O_CLOEXEC));
    if (fd < 0) {
      PLOG(ERROR) << "Failed to open " << dev_path.value();
      return nullptr;
    }
    scoped_fd.reset(fd);

    num_auth_attempts++;
    // To avoid spamming the logs, hold off before logging a warning (some
    // failures are expected at first).
    const bool should_log_error =
        (base::TimeTicks::Now() - start_time).InMilliseconds() >=
        kLogAuthFailDelayMs;
    drm_magic_t magic;
    memset(&magic, 0, sizeof(magic));
    // We need to make sure the DRM device has enough privilege. Use the DRM
    // authentication logic to figure out if the device has enough permissions.
    int drm_errno = drmGetMagic(fd, &magic);
    if (drm_errno) {
      LOG_IF(ERROR, should_log_error)
          << "Failed to get magic cookie to authenticate: " << dev_path.value()
          << " with errno: " << drm_errno << " after " << num_auth_attempts
          << " attempt(s)";
      usleep(kAuthFailSleepMs * 1000);
      continue;
    }
    drm_errno = drmAuthMagic(fd, magic);
    if (drm_errno) {
      LOG_IF(ERROR, should_log_error)
          << "Failed to authenticate: " << dev_path.value()
          << " with errno: " << drm_errno << " after " << num_auth_attempts
          << " attempt(s)";
      usleep(kAuthFailSleepMs * 1000);
      continue;
    }
    break;
  }

  VLOG(1) << "Succeeded authenticating " << dev_path.value() << " in "
          << (base::TimeTicks::Now() - start_time).InMilliseconds() << " ms "
          << "with " << num_auth_attempts << " attempt(s)";

  auto drm = std::make_unique<DrmWrapper>(sys_path, std::move(scoped_fd),
                                          is_primary_device);

  if (!drm->Initialize()) {
    LOG(ERROR) << "Failed to initialize " << dev_path.value();
    return nullptr;
  }

  return drm;
}

void OpenDeviceAsync(const base::FilePath& device_path,
                     const scoped_refptr<base::TaskRunner>& reply_runner,
                     OnOpenDeviceReplyCallback callback) {
  base::FilePath sys_path = MapDevPathToSysPath(device_path);

  std::unique_ptr<DrmWrapper> drm =
      OpenDrmDevice(device_path, sys_path, /*is_primary_device=*/false);
  reply_runner->PostTask(
      FROM_HERE, base::BindOnce(std::move(callback), device_path, sys_path,
                                std::move(drm)));
}

struct DisplayCard {
  base::FilePath path;
  std::optional<std::string> driver;
};

std::vector<DisplayCard> GetValidDisplayCards() {
  std::vector<DisplayCard> cards;

  for (int card_number = 0; /* end on first card# that does not exist */;
       card_number++) {
    std::string card_path =
        base::StringPrintf(kDefaultGraphicsCardPattern, card_number);

    if (access(card_path.c_str(), F_OK) != 0) {
      if (card_number == 0) /* card paths may start with 0 or 1 */
        continue;
      else
        break;
    }

    base::ScopedFD fd(open(card_path.c_str(), O_RDWR | O_CLOEXEC));
    if (!fd.is_valid()) {
      VPLOG(1) << "Failed to open '" << card_path << "'";
      continue;
    }

    struct drm_mode_card_res res;
    memset(&res, 0, sizeof(struct drm_mode_card_res));
    int ret = drmIoctl(fd.get(), DRM_IOCTL_MODE_GETRESOURCES, &res);
    VPLOG_IF(1, ret) << "Failed to get DRM resources for '" << card_path << "'";

    if (ret == 0 && res.count_crtcs > 0) {
      cards.push_back(
          {base::FilePath(card_path), GetDrmDriverNameFromFd(fd.get())});
    }
  }

  return cards;
}

base::FilePath GetPrimaryDisplayCardPath() {
  // The kernel might not have the DRM driver ready yet. This can happen when
  // the DRM driver binding has been deferred, waiting on dependencies to be
  // ready. Instead of failing if the driver isn't ready, retry until it's
  // there before crashing.
  for (int i = 0; i < 10; ++i) {
    std::vector<DisplayCard> cards = GetValidDisplayCards();

    // Find the card with the most preferred driver.
    const auto preferred_drivers = GetPreferredDrmDrivers();
    for (const auto* preferred_driver : preferred_drivers) {
      for (const auto& card : cards) {
        if (card.driver == preferred_driver)
          return card.path;
      }
    }

    // Fall back to the first usable card.
    if (!cards.empty())
      return cards[0].path;

    // If no card is ready, sleep and try again.
    usleep(kDriverReadySleepMs * 1000);
  }

  LOG(FATAL) << "Failed to open primary graphics device.";
}

}  // namespace

DrmDisplayHostManager::DrmDisplayHostManager(
    GpuThreadAdapter* proxy,
    DeviceManager* device_manager,
    OzonePlatform::PlatformRuntimeProperties* host_properties,
    InputControllerEvdev* input_controller)
    : proxy_(proxy),
      device_manager_(device_manager),
      input_controller_(input_controller),
      primary_graphics_card_path_(GetPrimaryDisplayCardPath()) {
  {
    // First device needs to be treated specially. We need to open this
    // synchronously since the GPU process will need it to initialize the
    // graphics state.
    base::ScopedAllowBlocking scoped_allow_blocking;

    base::FilePath primary_graphics_card_path_sysfs =
        MapDevPathToSysPath(primary_graphics_card_path_);

    primary_drm_device_ = OpenDrmDevice(primary_graphics_card_path_,
                                        primary_graphics_card_path_sysfs,
                                        /*is_primary_device=*/true);
    if (!primary_drm_device_) {
      LOG(FATAL) << "Failed to open primary graphics card";
    }
    host_properties->supports_overlays = primary_drm_device_->is_atomic();
    drm_devices_[primary_graphics_card_path_] =
        primary_graphics_card_path_sysfs;
  }

  device_manager_->AddObserver(this);
  proxy_->RegisterHandlerForDrmDisplayHostManager(this);
  proxy_->AddGpuThreadObserver(this);

  auto display_infos = GetAvailableDisplayControllerInfos(*primary_drm_device_);
  ConsolidateTiledDisplayInfo(display_infos);
  has_dummy_display_ = !display_infos.empty();
  MapEdidIdToDisplaySnapshot edid_id_collision_map;
  for (auto& display_info : display_infos) {
    // Create a dummy DisplaySnapshot and resolve display ID collisions.
    std::unique_ptr<display::DisplaySnapshot> current_display_snapshot =
        CreateDisplaySnapshot(*primary_drm_device_, display_info.get(), 0);

    const auto colliding_display_snapshot_iter =
        edid_id_collision_map.find(current_display_snapshot->edid_display_id());
    if (colliding_display_snapshot_iter != edid_id_collision_map.end()) {
      // Resolve collisions by adding each colliding display's connector index
      // to its display ID.
      current_display_snapshot->AddIndexToDisplayId();

      display::DisplaySnapshot* colliding_display_snapshot =
          colliding_display_snapshot_iter->second;
      colliding_display_snapshot->AddIndexToDisplayId();
      edid_id_collision_map[colliding_display_snapshot->edid_display_id()] =
          colliding_display_snapshot;
    }

    // Update the map with the new (or potentially resolved) display snapshot.
    edid_id_collision_map[current_display_snapshot->edid_display_id()] =
        current_display_snapshot.get();

    displays_.push_back(std::make_unique<DrmDisplayHost>(
        proxy_, std::move(current_display_snapshot), true /* is_dummy */));
  }
}

DrmDisplayHostManager::~DrmDisplayHostManager() {
  device_manager_->RemoveObserver(this);
  proxy_->UnRegisterHandlerForDrmDisplayHostManager();
  proxy_->RemoveGpuThreadObserver(this);
}

DrmDisplayHostManager::DisplayEvent::DisplayEvent(
    DeviceEvent::ActionType action_type,
    const base::FilePath& path,
    const EventPropertyMap& properties)
    : action_type(action_type), path(path), display_event_props(properties) {}

DrmDisplayHostManager::DisplayEvent::DisplayEvent(const DisplayEvent&) =
    default;
DrmDisplayHostManager::DisplayEvent&
DrmDisplayHostManager::DisplayEvent::operator=(const DisplayEvent&) = default;

DrmDisplayHostManager::DisplayEvent::~DisplayEvent() = default;

DrmDisplayHost* DrmDisplayHostManager::GetDisplay(int64_t display_id) {
  auto it =
      std::ranges::find(displays_, display_id,
                        [](const std::unique_ptr<DrmDisplayHost>& display) {
                          return display->snapshot()->display_id();
                        });
  if (it == displays_.end())
    return nullptr;

  return it->get();
}

void DrmDisplayHostManager::AddDelegate(DrmNativeDisplayDelegate* delegate) {
  DCHECK(!delegate_);
  delegate_ = delegate;
}

void DrmDisplayHostManager::RemoveDelegate(DrmNativeDisplayDelegate* delegate) {
  DCHECK_EQ(delegate_, delegate);
  delegate_ = nullptr;
}

void DrmDisplayHostManager::TakeDisplayControl(
    display::DisplayControlCallback callback) {
  TRACE_EVENT0("drm", "DrmDisplayHostManager::TakeDisplayControl");
  if (display_control_change_pending_) {
    LOG(ERROR) << "TakeDisplayControl called while change already pending";
    std::move(callback).Run(false);
    return;
  }

  if (!display_externally_controlled_) {
    LOG(ERROR) << "TakeDisplayControl called while display already owned";
    std::move(callback).Run(true);
    return;
  }

  take_display_control_callback_ = std::move(callback);
  display_control_change_pending_ = true;

  if (!proxy_->GpuTakeDisplayControl())
    GpuTookDisplayControl(false);
}

void DrmDisplayHostManager::RelinquishDisplayControl(
    display::DisplayControlCallback callback) {
  TRACE_EVENT0("drm", "DrmDisplayHostManager::RelinquishDisplayControl");
  if (display_control_change_pending_) {
    LOG(ERROR)
        << "RelinquishDisplayControl called while change already pending";
    std::move(callback).Run(false);
    return;
  }

  if (display_externally_controlled_) {
    LOG(ERROR) << "RelinquishDisplayControl called while display not owned";
    std::move(callback).Run(true);
    return;
  }

  relinquish_display_control_callback_ = std::move(callback);
  display_control_change_pending_ = true;

  if (!proxy_->GpuRelinquishDisplayControl())
    GpuRelinquishedDisplayControl(false);
}

void DrmDisplayHostManager::UpdateDisplays(
    display::GetDisplaysCallback callback) {
  get_displays_callback_ = std::move(callback);
  if (!proxy_->GpuRefreshNativeDisplays()) {
    RunUpdateDisplaysCallback(std::move(get_displays_callback_));
    get_displays_callback_.Reset();
  }
}

void DrmDisplayHostManager::ConfigureDisplays(
    const std::vector<display::DisplayConfigurationParams>& config_requests,
    display::ConfigureCallback callback,
    display::ModesetFlags modeset_flags) {
  for (auto& config : config_requests) {
    if (GetDisplay(config.id)->is_dummy()) {
      std::move(callback).Run(config_requests, true);
      return;
    }
  }

  proxy_->GpuConfigureNativeDisplays(config_requests, std::move(callback),
                                     modeset_flags);
}

void DrmDisplayHostManager::OnDeviceEvent(const DeviceEvent& event) {
  if (event.device_type() != DeviceEvent::DISPLAY)
    return;

  event_queue_.emplace(event.action_type(), event.path(), event.properties());
  ProcessEvent();
}

void DrmDisplayHostManager::ProcessEvent() {
  while (!event_queue_.empty() && !task_pending_) {
    DisplayEvent event = event_queue_.front();
    event_queue_.pop();
    auto seqnum_it = event.display_event_props.find("SEQNUM");
    const std::string seqnum = seqnum_it == event.display_event_props.end()
                                   ? ""
                                   : ("(SEQNUM:" + seqnum_it->second + ")");
    VLOG(1) << "Got display event " << kDisplayActionString[event.action_type]
            << seqnum << " for " << event.path.value();
    switch (event.action_type) {
      case DeviceEvent::ADD:
        if (drm_devices_.find(event.path) == drm_devices_.end()) {
          base::ThreadPool::PostTask(
              FROM_HERE,
              {base::MayBlock(),
               base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
              base::BindOnce(
                  &OpenDeviceAsync, event.path,
                  base::SingleThreadTaskRunner::GetCurrentDefault(),
                  base::BindOnce(&DrmDisplayHostManager::OnAddGraphicsDevice,
                                 weak_ptr_factory_.GetWeakPtr())));
          task_pending_ = true;
        }
        break;
      case DeviceEvent::CHANGE:
        task_pending_ =
            base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
                FROM_HERE,
                base::BindOnce(&DrmDisplayHostManager::OnUpdateGraphicsDevice,
                               weak_ptr_factory_.GetWeakPtr(),
                               event.display_event_props));
        break;
      case DeviceEvent::REMOVE:
        DCHECK(event.path != primary_graphics_card_path_)
            << "Removing primary graphics card";
        auto it = drm_devices_.find(event.path);
        if (it != drm_devices_.end()) {
          task_pending_ =
              base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
                  FROM_HERE,
                  base::BindOnce(&DrmDisplayHostManager::OnRemoveGraphicsDevice,
                                 weak_ptr_factory_.GetWeakPtr(), it->second));
          drm_devices_.erase(it);
        }
        break;
    }
  }
}

void DrmDisplayHostManager::OnAddGraphicsDevice(
    const base::FilePath& dev_path,
    const base::FilePath& sys_path,
    std::unique_ptr<DrmWrapper> drm) {
  if (drm) {
    drm_devices_[dev_path] = sys_path;
    proxy_->GpuAddGraphicsDevice(sys_path,
                                 DrmWrapper::ToScopedFD(std::move(drm)));
    NotifyDisplayDelegate();
  }

  task_pending_ = false;
  ProcessEvent();
}

void DrmDisplayHostManager::OnUpdateGraphicsDevice(
    const EventPropertyMap& udev_event_props) {
  proxy_->GpuShouldDisplayEventTriggerConfiguration(udev_event_props);
}

void DrmDisplayHostManager::OnRemoveGraphicsDevice(
    const base::FilePath& sys_path) {
  proxy_->GpuRemoveGraphicsDevice(sys_path);
  NotifyDisplayDelegate();
  task_pending_ = false;
  ProcessEvent();
}

void DrmDisplayHostManager::OnGpuProcessLaunched() {
  std::unique_ptr<DrmWrapper> primary_drm_device =
      std::move(primary_drm_device_);
  {
    base::ScopedAllowBlocking scoped_allow_blocking;

    drm_devices_.clear();
    drm_devices_[primary_graphics_card_path_] =
        MapDevPathToSysPath(primary_graphics_card_path_);

    if (!primary_drm_device) {
      primary_drm_device =
          OpenDrmDevice(primary_graphics_card_path_,
                        drm_devices_[primary_graphics_card_path_],
                        /*is_primary_device=*/true);
      if (!primary_drm_device) {
        LOG(FATAL) << "Failed to open the primary graphics card";
      }
    }
  }

  // Send the primary device first since this is used to initialize graphics
  // state.
  proxy_->GpuAddGraphicsDevice(
      drm_devices_[primary_graphics_card_path_],
      DrmWrapper::ToScopedFD(std::move(primary_drm_device)));
}

void DrmDisplayHostManager::OnGpuThreadReady() {
  // If in the middle of a configuration, just respond with the old list of
  // displays. This is fine, since after the DRM resources are initialized and
  // IPC-ed to the GPU NotifyDisplayDelegate() is called to let the display
  // delegate know that the display configuration changed and it needs to
  // update it again.
  if (!get_displays_callback_.is_null()) {
    base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
        FROM_HERE,
        base::BindOnce(&DrmDisplayHostManager::RunUpdateDisplaysCallback,
                       weak_ptr_factory_.GetWeakPtr(),
                       std::move(get_displays_callback_)));
    get_displays_callback_.Reset();
  }

  // Signal that we're taking DRM master since we're going through the
  // initialization process again and we'll take all the available resources.
  if (!take_display_control_callback_.is_null())
    GpuTookDisplayControl(true);

  if (!relinquish_display_control_callback_.is_null())
    GpuRelinquishedDisplayControl(false);

  device_manager_->ScanDevices(this);
  NotifyDisplayDelegate();
}

void DrmDisplayHostManager::OnGpuThreadRetired() {}

void DrmDisplayHostManager::GpuHasUpdatedNativeDisplays(
    MovableDisplaySnapshots displays) {
  if (delegate_)
    delegate_->OnDisplaySnapshotsInvalidated();
  std::vector<std::unique_ptr<DrmDisplayHost>> old_displays;
  displays_.swap(old_displays);
  for (auto& display : displays) {
    auto it =
        std::ranges::find(old_displays, display->display_id(),
                          [](const std::unique_ptr<DrmDisplayHost>& display) {
                            return display->snapshot()->display_id();
                          });
    if (it == old_displays.end()) {
      displays_.push_back(std::make_unique<DrmDisplayHost>(
          proxy_, std::move(display), false /* is_dummy */));
    } else {
      (*it)->UpdateDisplaySnapshot(std::move(display));
      displays_.push_back(std::move(*it));
      old_displays.erase(it);
    }
  }

  if (!get_displays_callback_.is_null()) {
    base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
        FROM_HERE,
        base::BindOnce(&DrmDisplayHostManager::RunUpdateDisplaysCallback,
                       weak_ptr_factory_.GetWeakPtr(),
                       std::move(get_displays_callback_)));
    get_displays_callback_.Reset();
  }
}

void DrmDisplayHostManager::GpuSetHdcpKeyProp(int64_t display_id,
                                              bool success) {
  DrmDisplayHost* display = GetDisplay(display_id);
  if (display) {
    display->OnHdcpKeyPropSetReceived(success);
  } else {
    LOG(ERROR) << "Couldn't find display with id=" << display_id;
  }
}

void DrmDisplayHostManager::GpuReceivedHDCPState(
    int64_t display_id,
    bool status,
    display::HDCPState state,
    display::ContentProtectionMethod protection_method) {
  DrmDisplayHost* display = GetDisplay(display_id);
  if (display)
    display->OnHDCPStateReceived(status, state, protection_method);
  else
    LOG(ERROR) << "Couldn't find display with id=" << display_id;
}

void DrmDisplayHostManager::GpuUpdatedHDCPState(int64_t display_id,
                                                bool status) {
  DrmDisplayHost* display = GetDisplay(display_id);
  if (display)
    display->OnHDCPStateUpdated(status);
  else
    LOG(ERROR) << "Couldn't find display with id=" << display_id;
}

void DrmDisplayHostManager::GpuTookDisplayControl(bool status) {
  if (take_display_control_callback_.is_null()) {
    LOG(ERROR) << "No callback for take display control";
    return;
  }

  DCHECK(display_externally_controlled_);
  DCHECK(display_control_change_pending_);

  if (status) {
    scoped_input_devices_disabler_.reset();
    display_externally_controlled_ = false;
  }

  base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
      FROM_HERE,
      base::BindOnce(std::move(take_display_control_callback_), status));
  take_display_control_callback_.Reset();
  display_control_change_pending_ = false;
}

void DrmDisplayHostManager::GpuRelinquishedDisplayControl(bool status) {
  if (relinquish_display_control_callback_.is_null()) {
    LOG(ERROR) << "No callback for relinquish display control";
    return;
  }

  DCHECK(!display_externally_controlled_);
  DCHECK(display_control_change_pending_);

  if (status) {
    scoped_input_devices_disabler_ = input_controller_->DisableInputDevices();
    display_externally_controlled_ = true;
  }

  base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
      FROM_HERE,
      base::BindOnce(std::move(relinquish_display_control_callback_), status));
  relinquish_display_control_callback_.Reset();
  display_control_change_pending_ = false;
}

void DrmDisplayHostManager::GpuShouldDisplayEventTriggerConfiguration(
    bool should_trigger) {
  if (should_trigger)
    NotifyDisplayDelegate();

  task_pending_ = false;
  ProcessEvent();
}

void DrmDisplayHostManager::RunUpdateDisplaysCallback(
    display::GetDisplaysCallback callback) const {
  std::vector<raw_ptr<display::DisplaySnapshot, VectorExperimental>> snapshots;
  for (const auto& display : displays_)
    snapshots.push_back(display->snapshot());

  std::move(callback).Run(snapshots);
}

void DrmDisplayHostManager::NotifyDisplayDelegate() const {
  if (delegate_)
    delegate_->OnConfigurationChanged();
}

}  // namespace ui