Remove libvrflinger

// Copyright (C) 2008 The Android Open Source Project

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

package {

    // See: http://go/android-license-faq

    // A large-scale-change added 'default_applicable_licenses' to import

    // all of the 'license_kinds' from "frameworks_native_license"

    // to get the below license kinds:

    //   SPDX-license-identifier-Apache-2.0

    default_applicable_licenses: ["frameworks_native_license"],

}

sourceFiles = [

    "acquired_buffer.cpp",

    "epoll_event_dispatcher.cpp",

    "display_manager_service.cpp",

    "display_service.cpp",

    "display_surface.cpp",

    "hardware_composer.cpp",

    "vr_flinger.cpp",

]

includeFiles = ["include"]

staticLibraries = [

    "libdisplay",

    "libdvrcommon",

    "libperformance",

    "libvrsensor",

    "libbroadcastring",

    "libvr_manager",

    "libbroadcastring",

    "libaidlcommonsupport",

]

sharedLibraries = [

    "android.frameworks.vr.composer@2.0",

    "android.hardware.graphics.allocator@2.0",

    "android.hardware.graphics.composer@2.1",

    "android.hardware.graphics.composer@2.2",

    "android.hardware.graphics.composer@2.3",

    "android.hardware.graphics.composer@2.4",

    "android.hardware.graphics.composer3-V1-ndk",

    "libbinder",

    "libbinder_ndk",

    "libbase",

    "libbufferhubqueue",

    "libcutils",

    "liblog",

    "libhardware",

    "libnativewindow",

    "libprocessgroup",

    "libutils",

    "libEGL",

    "libGLESv1_CM",

    "libGLESv2",

    "libvulkan",

    "libui",

    "libgui",

    "libsync",

    "libhidlbase",

    "libfmq",

    "libpdx_default_transport",

]

headerLibraries = [

    "android.hardware.graphics.composer@2.1-command-buffer",

    "android.hardware.graphics.composer@2.2-command-buffer",

    "android.hardware.graphics.composer@2.3-command-buffer",

    "android.hardware.graphics.composer@2.4-command-buffer",

    "android.hardware.graphics.composer3-command-buffer",

    "libdvr_headers",

    "libsurfaceflinger_headers",

]

cc_library_static {

    srcs: sourceFiles,

    export_include_dirs: includeFiles,

    clang: true,

    cflags: [

        "-DLOG_TAG=\"vr_flinger\"",

        "-DTRACE=0",

        "-DATRACE_TAG=ATRACE_TAG_GRAPHICS",

        "-DGL_GLEXT_PROTOTYPES",

        "-DEGL_EGLEXT_PROTOTYPES",

        "-Wall",

        "-Werror",

        "-Wno-error=sign-compare", // to fix later

        "-Wno-unused-variable",

    ],

    shared_libs: sharedLibraries,

    whole_static_libs: staticLibraries,

    header_libs: headerLibraries,

    name: "libvrflinger",

}

subdirs = [

    "tests",

]

#include "acquired_buffer.h"

#include <log/log.h>

#include <sync/sync.h>

using android::pdx::LocalHandle;

namespace android {

namespace dvr {

AcquiredBuffer::AcquiredBuffer(const std::shared_ptr<ConsumerBuffer>& buffer,

                               LocalHandle acquire_fence, std::size_t slot)

    : buffer_(buffer), acquire_fence_(std::move(acquire_fence)), slot_(slot) {}

AcquiredBuffer::AcquiredBuffer(const std::shared_ptr<ConsumerBuffer>& buffer,

                               int* error) {

  LocalHandle fence;

  const int ret = buffer->Acquire(&fence);

  if (error)

    *error = ret;

  if (ret < 0) {

    ALOGW("AcquiredBuffer::AcquiredBuffer: Failed to acquire buffer: %s",

          strerror(-ret));

    buffer_ = nullptr;

    // Default construct sets acquire_fence_ to empty.

  } else {

    buffer_ = buffer;

    acquire_fence_ = std::move(fence);

  }

}

AcquiredBuffer::AcquiredBuffer(AcquiredBuffer&& other) noexcept {

  *this = std::move(other);

}

AcquiredBuffer::~AcquiredBuffer() { Release(LocalHandle(kEmptyFence)); }

AcquiredBuffer& AcquiredBuffer::operator=(AcquiredBuffer&& other) noexcept {

  if (this != &other) {

    Release();

    using std::swap;

    swap(buffer_, other.buffer_);

    swap(acquire_fence_, other.acquire_fence_);

    swap(slot_, other.slot_);

  }

  return *this;

}

bool AcquiredBuffer::IsAvailable() const {

  if (IsEmpty())

    return false;

  // Only check the fence if the acquire fence is not empty.

  if (acquire_fence_) {

    const int ret = sync_wait(acquire_fence_.Get(), 0);

    ALOGD_IF(TRACE || (ret < 0 && errno != ETIME),

             "AcquiredBuffer::IsAvailable: buffer_id=%d acquire_fence=%d "

             "sync_wait()=%d errno=%d.",

             buffer_->id(), acquire_fence_.Get(), ret, ret < 0 ? errno : 0);

    if (ret == 0) {

      // The fence is completed, so to avoid further calls to sync_wait we close

      // it here.

      acquire_fence_.Close();

    }

    return ret == 0;

  } else {

    return true;

  }

}

LocalHandle AcquiredBuffer::ClaimAcquireFence() {

  return std::move(acquire_fence_);

}

std::shared_ptr<ConsumerBuffer> AcquiredBuffer::ClaimBuffer() {

  return std::move(buffer_);

}

int AcquiredBuffer::Release(LocalHandle release_fence) {

  ALOGD_IF(TRACE, "AcquiredBuffer::Release: buffer_id=%d release_fence=%d",

           buffer_ ? buffer_->id() : -1, release_fence.Get());

  if (buffer_) {

    const int ret = buffer_->ReleaseAsync();

    if (ret < 0) {

      ALOGE("AcquiredBuffer::Release: Failed to release buffer %d: %s",

            buffer_->id(), strerror(-ret));

      if (ret != -ESHUTDOWN)

        return ret;

    }

    buffer_ = nullptr;

  }

  acquire_fence_.Close();

  slot_ = 0;

  return 0;

}

}  // namespace dvr

}  // namespace android

#ifndef ANDROID_DVR_SERVICES_DISPLAYD_ACQUIRED_BUFFER_H_

#define ANDROID_DVR_SERVICES_DISPLAYD_ACQUIRED_BUFFER_H_

#include <pdx/file_handle.h>

#include <private/dvr/consumer_buffer.h>

#include <memory>

namespace android {

namespace dvr {

// Manages the ACQUIRE/RELEASE ownership cycle of a ConsumerBuffer.

class AcquiredBuffer {

 public:

  static constexpr int kEmptyFence = pdx::LocalHandle::kEmptyFileHandle;

  AcquiredBuffer() : buffer_(nullptr), acquire_fence_(kEmptyFence) {}

  // Constructs an AcquiredBuffer from a ConsumerBuffer pointer and an acquire

  // fence. The ConsumerBuffer MUST be in the ACQUIRED state prior to calling

  // this constructor; the constructor does not attempt to ACQUIRE the buffer

  // itself.

  AcquiredBuffer(const std::shared_ptr<ConsumerBuffer>& buffer,

                 pdx::LocalHandle acquire_fence, std::size_t slot = 0);

  // Constructs an AcquiredBuffer from a ConsumerBuffer. The ConsumerBuffer MUST

  // be in the POSTED state prior to calling this constructor, as this

  // constructor attempts to ACQUIRE the buffer. If ACQUIRING the buffer fails

  // this instance is left in the empty state. An optional error code is

  // returned in |error|, which may be nullptr if not needed.

  AcquiredBuffer(const std::shared_ptr<ConsumerBuffer>& buffer, int* error);

  // Move constructor. Behaves similarly to the move assignment operator below.

  AcquiredBuffer(AcquiredBuffer&& other) noexcept;

  ~AcquiredBuffer();

  // Move assignment operator. Moves the ConsumerBuffer and acquire fence from

  // |other| into this instance after RELEASING the current ConsumerBuffer and

  // closing the acquire fence. After the move |other| is left in the empty

  // state.

  AcquiredBuffer& operator=(AcquiredBuffer&& other) noexcept;

  // Accessors for the underlying ConsumerBuffer, the acquire fence, and the

  // use-case specific sequence value from the acquisition (see

  // private/dvr/consumer_buffer.h).

  std::shared_ptr<ConsumerBuffer> buffer() const { return buffer_; }

  int acquire_fence() const { return acquire_fence_.Get(); }

  // When non-empty, returns true if the acquired fence was signaled (or if the

  // fence is empty). Returns false when empty or if the fence is not signaled.

  bool IsAvailable() const;

  bool IsEmpty() const { return buffer_ == nullptr; }

  // Returns the acquire fence, passing ownership to the caller.

  pdx::LocalHandle ClaimAcquireFence();

  // Returns the buffer, passing ownership to the caller. Caller is responsible

  // for calling Release on the returned buffer.

  std::shared_ptr<ConsumerBuffer> ClaimBuffer();

  // Releases the ConsumerBuffer, passing the release fence in |release_fence|

  // to the producer. On success, the ConsumerBuffer and acquire fence are set

  // to empty state; if release fails, the ConsumerBuffer and acquire fence are

  // left in place and a negative error code is returned.

  int Release(pdx::LocalHandle release_fence = {});

  // Returns the slot in the queue this buffer belongs to. Buffers that are not

  // part of a queue return 0.

  std::size_t slot() const { return slot_; }

 private:

  std::shared_ptr<ConsumerBuffer> buffer_;

  // Mutable so that the fence can be closed when it is determined to be

  // signaled during IsAvailable().

  mutable pdx::LocalHandle acquire_fence_;

  std::size_t slot_{0};

  AcquiredBuffer(const AcquiredBuffer&) = delete;

  void operator=(const AcquiredBuffer&) = delete;

};

}  // namespace dvr

}  // namespace android

#endif  // ANDROID_DVR_SERVICES_DISPLAYD_ACQUIRED_BUFFER_H_

#include "display_manager_service.h"

#include <pdx/channel_handle.h>

#include <pdx/default_transport/service_endpoint.h>

#include <private/android_filesystem_config.h>

#include <private/dvr/display_protocol.h>

#include <private/dvr/trusted_uids.h>

#include <sys/poll.h>

#include <array>

using android::dvr::display::DisplayManagerProtocol;

using android::pdx::Channel;

using android::pdx::LocalChannelHandle;

using android::pdx::Message;

using android::pdx::default_transport::Endpoint;

using android::pdx::ErrorStatus;

using android::pdx::rpc::DispatchRemoteMethod;

using android::pdx::rpc::IfAnyOf;

using android::pdx::rpc::RemoteMethodError;

namespace android {

namespace dvr {

void DisplayManager::SetNotificationsPending(bool pending) {

  auto status = service_->ModifyChannelEvents(channel_id_, pending ? 0 : POLLIN,

                                              pending ? POLLIN : 0);

  ALOGE_IF(!status,

           "DisplayManager::SetNotificationPending: Failed to modify channel "

           "events: %s",

           status.GetErrorMessage().c_str());

}

DisplayManagerService::DisplayManagerService(

    const std::shared_ptr<DisplayService>& display_service)

    : BASE("DisplayManagerService",

           Endpoint::Create(DisplayManagerProtocol::kClientPath)),

      display_service_(display_service) {

  display_service_->SetDisplayConfigurationUpdateNotifier(

      std::bind(&DisplayManagerService::OnDisplaySurfaceChange, this));

}

std::shared_ptr<pdx::Channel> DisplayManagerService::OnChannelOpen(

    pdx::Message& message) {

  const int user_id = message.GetEffectiveUserId();

  const bool trusted = user_id == AID_ROOT || IsTrustedUid(user_id);

  // Check if the display_manager_ has a defunct channel.

  if (display_manager_ && !HasChannelId(display_manager_->channel_id())) {

    ALOGE("DisplayManagerService::OnChannelOpen: Found defunct channel %d with "

          "no OnChannelClose, clearing prior display manager.",

          display_manager_->channel_id());

    display_manager_ = nullptr;

  }

  // Prevent more than one display manager from registering at a time or

  // untrusted UIDs from connecting.

  if (display_manager_ || !trusted) {

    RemoteMethodError(message, EPERM);

    return nullptr;

  }

  display_manager_ =

      std::make_shared<DisplayManager>(this, message.GetChannelId());

  return display_manager_;

}

void DisplayManagerService::OnChannelClose(

    pdx::Message& /*message*/, const std::shared_ptr<pdx::Channel>& channel) {

  // Unregister the display manager when the channel closes.

  if (display_manager_ == channel)

    display_manager_ = nullptr;

}

pdx::Status<void> DisplayManagerService::HandleMessage(pdx::Message& message) {

  ATRACE_NAME("DisplayManagerService::HandleMessage");

  auto channel = std::static_pointer_cast<DisplayManager>(message.GetChannel());

  switch (message.GetOp()) {

    case DisplayManagerProtocol::GetSurfaceState::Opcode:

      DispatchRemoteMethod<DisplayManagerProtocol::GetSurfaceState>(

          *this, &DisplayManagerService::OnGetSurfaceState, message);

      return {};

    case DisplayManagerProtocol::GetSurfaceQueue::Opcode:

      DispatchRemoteMethod<DisplayManagerProtocol::GetSurfaceQueue>(

          *this, &DisplayManagerService::OnGetSurfaceQueue, message);

      return {};

    default:

      return Service::DefaultHandleMessage(message);

  }

}

pdx::Status<std::vector<display::SurfaceState>>

DisplayManagerService::OnGetSurfaceState(pdx::Message& /*message*/) {

  std::vector<display::SurfaceState> items;

  display_service_->ForEachDisplaySurface(

      SurfaceType::Application,

      [&items](const std::shared_ptr<DisplaySurface>& surface) mutable {

        items.push_back({surface->surface_id(), surface->process_id(),

                         surface->user_id(), surface->attributes(),

                         surface->update_flags(), surface->GetQueueIds()});

        surface->ClearUpdate();

      });

  // The fact that we're in the message handler implies that display_manager_ is

  // not nullptr. No check required, unless this service becomes multi-threaded.

  display_manager_->SetNotificationsPending(false);

  return items;

}

pdx::Status<pdx::LocalChannelHandle> DisplayManagerService::OnGetSurfaceQueue(

    pdx::Message& /*message*/, int surface_id, int queue_id) {

  auto surface = display_service_->GetDisplaySurface(surface_id);

  if (!surface || surface->surface_type() != SurfaceType::Application)

    return ErrorStatus(EINVAL);

  auto queue =

      std::static_pointer_cast<ApplicationDisplaySurface>(surface)->GetQueue(

          queue_id);

  if (!queue)

    return ErrorStatus(EINVAL);

  auto status = queue->CreateConsumerQueueHandle();

  ALOGE_IF(

      !status,

      "DisplayManagerService::OnGetSurfaceQueue: Failed to create consumer "

      "queue for queue_id=%d: %s",

      queue->id(), status.GetErrorMessage().c_str());

  return status;

}

void DisplayManagerService::OnDisplaySurfaceChange() {

  if (display_manager_)

    display_manager_->SetNotificationsPending(true);

}

}  // namespace dvr

}  // namespace android

#ifndef ANDROID_DVR_SERVICES_VRFLINGER_DISPLAY_MANAGER_SERVICE_H_

#define ANDROID_DVR_SERVICES_VRFLINGER_DISPLAY_MANAGER_SERVICE_H_

#include <pdx/service.h>

#include <pdx/status.h>

#include <private/dvr/display_protocol.h>

#include "display_service.h"

namespace android {

namespace dvr {

class DisplayManagerService;

// The display manager is a client of the display manager service. This class

// represents the connected client that the display manager service sends

// notifications to.

class DisplayManager : public pdx::Channel {

 public:

  DisplayManager(DisplayManagerService* service, int channel_id)

      : service_(service), channel_id_(channel_id) {}

  int channel_id() const { return channel_id_; }

  // Sets or clears the channel event mask to indicate pending events that the

  // display manager on the other end of the channel should read and handle.

  // When |pending| is true the POLLIN bit is set in the event mask; when

  // |pending| is false the POLLIN bit is cleared in the event mask.

  void SetNotificationsPending(bool pending);

 private:

  DisplayManager(const DisplayManager&) = delete;

  void operator=(const DisplayManager&) = delete;

  DisplayManagerService* service_;

  int channel_id_;

};

// The display manager service marshalls state and events from the display

// service to the display manager.

class DisplayManagerService : public pdx::ServiceBase<DisplayManagerService> {

 public:

  std::shared_ptr<pdx::Channel> OnChannelOpen(pdx::Message& message) override;

  void OnChannelClose(pdx::Message& message,

                      const std::shared_ptr<pdx::Channel>& channel) override;

  pdx::Status<void> HandleMessage(pdx::Message& message) override;

 private:

  friend BASE;

  explicit DisplayManagerService(

      const std::shared_ptr<DisplayService>& display_service);

  pdx::Status<std::vector<display::SurfaceState>> OnGetSurfaceState(

      pdx::Message& message);

  pdx::Status<pdx::LocalChannelHandle> OnGetSurfaceQueue(pdx::Message& message,

                                                         int surface_id,

                                                         int queue_id);

  // Called by the display service to indicate changes to display surfaces that

  // the display manager should evaluate.

  void OnDisplaySurfaceChange();

  DisplayManagerService(const DisplayManagerService&) = delete;

  void operator=(const DisplayManagerService&) = delete;

  std::shared_ptr<DisplayService> display_service_;

  std::shared_ptr<DisplayManager> display_manager_;

};

}  // namespace dvr

}  // namespace android

#endif  // ANDROID_DVR_SERVICES_VRFLINGER_DISPLAY_MANAGER_SERVICE_H_