hwc2_device/DrmHwcTwo.cpp - android_external_drm_hwcomposer - Gitiles

 /*
  * Copyright (C) 2016 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.
  */

 #define LOG_TAG "hwc-drm-two"

 #include "DrmHwcTwo.h"

 #include <cinttypes>

 #include "backend/Backend.h"
 #include "utils/log.h"

 namespace android {

 DrmHwcTwo::DrmHwcTwo() : resource_manager_(this){};

 /* Must be called after every display attach/detach cycle */
 void DrmHwcTwo::FinalizeDisplayBinding() {
   if (displays_.count(kPrimaryDisplay) == 0) {
     /* Primary display MUST always exist */
     ALOGI("No pipelines available. Creating null-display for headless mode");
     displays_[kPrimaryDisplay] = std::make_unique<
         HwcDisplay>(kPrimaryDisplay, HWC2::DisplayType::Physical, this);
     /* Initializes null-display */
     displays_[kPrimaryDisplay]->SetPipeline({});
   }

   if (displays_[kPrimaryDisplay]->IsInHeadlessMode() &&
       !display_handles_.empty()) {
     /* Reattach first secondary display to take place of the primary */
     auto pipe = display_handles_.begin()->first;
     ALOGI("Primary display was disconnected, reattaching '%s' as new primary",
           pipe->connector->Get()->GetName().c_str());
     UnbindDisplay(pipe);
     BindDisplay(pipe);
   }

   // Finally, send hotplug events to the client
   for (auto &dhe : deferred_hotplug_events_) {
     SendHotplugEventToClient(dhe.first, dhe.second);
   }
   deferred_hotplug_events_.clear();

   /* Wait 0.2s before removing the displays to flush pending HWC2 transactions
    */
   auto &mutex = GetResMan().GetMainLock();
   mutex.unlock();
   const int kTimeForSFToDisposeDisplayUs = 200000;
   usleep(kTimeForSFToDisposeDisplayUs);
   mutex.lock();
   for (auto handle : displays_for_removal_list_) {
     displays_.erase(handle);
   }
 }

 bool DrmHwcTwo::BindDisplay(std::shared_ptr<DrmDisplayPipeline> pipeline) {
   if (display_handles_.count(pipeline) != 0) {
     ALOGE("%s, pipeline is already used by another display, FIXME!!!: %p",
           __func__, pipeline.get());
     return false;
   }

   uint32_t disp_handle = kPrimaryDisplay;

   if (displays_.count(kPrimaryDisplay) != 0 &&
       !displays_[kPrimaryDisplay]->IsInHeadlessMode()) {
     disp_handle = ++last_display_handle_;
   }

   if (displays_.count(disp_handle) == 0) {
     auto disp = std::make_unique<HwcDisplay>(disp_handle,
                                              HWC2::DisplayType::Physical, this);
     displays_[disp_handle] = std::move(disp);
   }

   ALOGI("Attaching pipeline '%s' to the display #%d%s",
         pipeline->connector->Get()->GetName().c_str(), (int)disp_handle,
         disp_handle == kPrimaryDisplay ? " (Primary)" : "");

   displays_[disp_handle]->SetPipeline(pipeline);
   display_handles_[pipeline] = disp_handle;

   return true;
 }

 bool DrmHwcTwo::UnbindDisplay(std::shared_ptr<DrmDisplayPipeline> pipeline) {
   if (display_handles_.count(pipeline) == 0) {
     ALOGE("%s, can't find the display, pipeline: %p", __func__, pipeline.get());
     return false;
   }
   auto handle = display_handles_[pipeline];
   display_handles_.erase(pipeline);

   ALOGI("Detaching the pipeline '%s' from the display #%i%s",
         pipeline->connector->Get()->GetName().c_str(), (int)handle,
         handle == kPrimaryDisplay ? " (Primary)" : "");

   if (displays_.count(handle) == 0) {
     ALOGE("%s, can't find the display, handle: %" PRIu64, __func__, handle);
     return false;
   }
   displays_[handle]->SetPipeline({});

   /* We must defer display disposal and removal, since it may still have pending
    * HWC_API calls scheduled and waiting until ueventlistener thread releases
    * main lock, otherwise transaction may fail and SF may crash
    */
   if (handle != kPrimaryDisplay) {
     displays_for_removal_list_.emplace_back(handle);
   }
   return true;
 }

 HWC2::Error DrmHwcTwo::CreateVirtualDisplay(
     uint32_t width, uint32_t height,
     int32_t *format,  // NOLINT(readability-non-const-parameter)
     hwc2_display_t *display) {
   ALOGI("Creating virtual display %dx%d format %d", width, height, *format);

   auto virtual_pipeline = resource_manager_.GetVirtualDisplayPipeline();
   if (!virtual_pipeline)
     return HWC2::Error::Unsupported;

   *display = ++last_display_handle_;
   auto disp = std::make_unique<HwcDisplay>(*display, HWC2::DisplayType::Virtual,
                                            this);

   disp->SetVirtualDisplayResolution(width, height);
   disp->SetPipeline(virtual_pipeline);
   displays_[*display] = std::move(disp);
   return HWC2::Error::None;
 }

 HWC2::Error DrmHwcTwo::DestroyVirtualDisplay(hwc2_display_t display) {
   ALOGI("Destroying virtual display %" PRIu64, display);

   if (displays_.count(display) == 0) {
     ALOGE("Trying to destroy non-existent display %" PRIu64, display);
     return HWC2::Error::BadDisplay;
   }

   displays_[display]->SetPipeline({});

   /* Wait 0.2s before removing the displays to flush pending HWC2 transactions
    */
   auto &mutex = GetResMan().GetMainLock();
   mutex.unlock();
   const int kTimeForSFToDisposeDisplayUs = 200000;
   usleep(kTimeForSFToDisposeDisplayUs);
   mutex.lock();

   displays_.erase(display);

   return HWC2::Error::None;
 }

 void DrmHwcTwo::Dump(uint32_t *outSize, char *outBuffer) {
   if (outBuffer != nullptr) {
     auto copied_bytes = mDumpString.copy(outBuffer, *outSize);
     *outSize = static_cast<uint32_t>(copied_bytes);
     return;
   }

   std::stringstream output;

   output << "-- drm_hwcomposer --\n\n";

   for (auto &disp : displays_)
     output << disp.second->Dump();

   mDumpString = output.str();
   *outSize = static_cast<uint32_t>(mDumpString.size());
 }

 uint32_t DrmHwcTwo::GetMaxVirtualDisplayCount() {
   auto writeback_count = resource_manager_.GetWritebackConnectorsCount();
   writeback_count = std::min(writeback_count, 1U);
   /* Currently, only 1 virtual display is supported. Other cases need testing */
   ALOGI("Max virtual display count: %d", writeback_count);
   return writeback_count;
 }

 HWC2::Error DrmHwcTwo::RegisterCallback(int32_t descriptor,
                                         hwc2_callback_data_t data,
                                         hwc2_function_pointer_t function) {
   switch (static_cast<HWC2::Callback>(descriptor)) {
     case HWC2::Callback::Hotplug: {
       hotplug_callback_ = std::make_pair(HWC2_PFN_HOTPLUG(function), data);
       if (function != nullptr) {
         resource_manager_.Init();
       } else {
         resource_manager_.DeInit();
         /* Headless display may still be here. Remove it! */
         if (displays_.count(kPrimaryDisplay) != 0) {
           displays_[kPrimaryDisplay]->Deinit();
           displays_.erase(kPrimaryDisplay);
         }
       }
       break;
     }
     case HWC2::Callback::Refresh: {
       refresh_callback_ = std::make_pair(HWC2_PFN_REFRESH(function), data);
       break;
     }
     case HWC2::Callback::Vsync: {
       vsync_callback_ = std::make_pair(HWC2_PFN_VSYNC(function), data);
       break;
     }
 #if __ANDROID_API__ > 29
     case HWC2::Callback::Vsync_2_4: {
       vsync_2_4_callback_ = std::make_pair(HWC2_PFN_VSYNC_2_4(function), data);
       break;
     }
     case HWC2::Callback::VsyncPeriodTimingChanged: {
       period_timing_changed_callback_ = std::
           make_pair(HWC2_PFN_VSYNC_PERIOD_TIMING_CHANGED(function), data);
       break;
     }
 #endif
     default:
       break;
   }
   return HWC2::Error::None;
 }

 void DrmHwcTwo::SendHotplugEventToClient(hwc2_display_t displayid,
                                          bool connected) const {
   auto hc = hotplug_callback_;
   if (hc.first != nullptr && hc.second != nullptr) {
     /* For some reason HWC Service will call HWC2 API in hotplug callback
      * handler. This is the reason we're using recursive mutex.
      */
     hc.first(hc.second, displayid,
              connected == DRM_MODE_CONNECTED ? HWC2_CONNECTION_CONNECTED
                                              : HWC2_CONNECTION_DISCONNECTED);
   }
 }

 void DrmHwcTwo::SendVsyncEventToClient(
     hwc2_display_t displayid, int64_t timestamp,
     [[maybe_unused]] uint32_t vsync_period) const {
   /* vsync callback */
 #if __ANDROID_API__ > 29
   if (vsync_2_4_callback_.first != nullptr &&
       vsync_2_4_callback_.second != nullptr) {
     vsync_2_4_callback_.first(vsync_2_4_callback_.second, displayid, timestamp,
                               vsync_period);
   } else
 #endif
       if (vsync_callback_.first != nullptr &&
           vsync_callback_.second != nullptr) {
     vsync_callback_.first(vsync_callback_.second, displayid, timestamp);
   }
 }

 void DrmHwcTwo::SendVsyncPeriodTimingChangedEventToClient(
     [[maybe_unused]] hwc2_display_t displayid,
     [[maybe_unused]] int64_t timestamp) const {
 #if __ANDROID_API__ > 29
   hwc_vsync_period_change_timeline_t timeline = {
       .newVsyncAppliedTimeNanos = timestamp,
       .refreshRequired = false,
       .refreshTimeNanos = 0,
   };
   if (period_timing_changed_callback_.first != nullptr &&
       period_timing_changed_callback_.second != nullptr) {
     period_timing_changed_callback_
         .first(period_timing_changed_callback_.second, displayid, &timeline);
   }
 #endif
 }

 }  // namespace android
	/*
	* Copyright (C) 2016 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.
	*/

	#define LOG_TAG "hwc-drm-two"

	#include "DrmHwcTwo.h"

	#include <cinttypes>

	#include "backend/Backend.h"
	#include "utils/log.h"

	namespace android {

	DrmHwcTwo::DrmHwcTwo() : resource_manager_(this){};

	/* Must be called after every display attach/detach cycle */
	void DrmHwcTwo::FinalizeDisplayBinding() {
	if (displays_.count(kPrimaryDisplay) == 0) {
	/* Primary display MUST always exist */
	ALOGI("No pipelines available. Creating null-display for headless mode");
	displays_[kPrimaryDisplay] = std::make_unique<
	HwcDisplay>(kPrimaryDisplay, HWC2::DisplayType::Physical, this);
	/* Initializes null-display */
	displays_[kPrimaryDisplay]->SetPipeline({});
	}

	if (displays_[kPrimaryDisplay]->IsInHeadlessMode() &&
	!display_handles_.empty()) {
	/* Reattach first secondary display to take place of the primary */
	auto pipe = display_handles_.begin()->first;
	ALOGI("Primary display was disconnected, reattaching '%s' as new primary",
	pipe->connector->Get()->GetName().c_str());
	UnbindDisplay(pipe);
	BindDisplay(pipe);
	}

	// Finally, send hotplug events to the client
	for (auto &dhe : deferred_hotplug_events_) {
	SendHotplugEventToClient(dhe.first, dhe.second);
	}
	deferred_hotplug_events_.clear();

	/* Wait 0.2s before removing the displays to flush pending HWC2 transactions
	*/
	auto &mutex = GetResMan().GetMainLock();
	mutex.unlock();
	const int kTimeForSFToDisposeDisplayUs = 200000;
	usleep(kTimeForSFToDisposeDisplayUs);
	mutex.lock();
	for (auto handle : displays_for_removal_list_) {
	displays_.erase(handle);
	}
	}

	bool DrmHwcTwo::BindDisplay(std::shared_ptr<DrmDisplayPipeline> pipeline) {
	if (display_handles_.count(pipeline) != 0) {
	ALOGE("%s, pipeline is already used by another display, FIXME!!!: %p",
	__func__, pipeline.get());
	return false;
	}

	uint32_t disp_handle = kPrimaryDisplay;

	if (displays_.count(kPrimaryDisplay) != 0 &&
	!displays_[kPrimaryDisplay]->IsInHeadlessMode()) {
	disp_handle = ++last_display_handle_;
	}

	if (displays_.count(disp_handle) == 0) {
	auto disp = std::make_unique<HwcDisplay>(disp_handle,
	HWC2::DisplayType::Physical, this);
	displays_[disp_handle] = std::move(disp);
	}

	ALOGI("Attaching pipeline '%s' to the display #%d%s",
	pipeline->connector->Get()->GetName().c_str(), (int)disp_handle,
	disp_handle == kPrimaryDisplay ? " (Primary)" : "");

	displays_[disp_handle]->SetPipeline(pipeline);
	display_handles_[pipeline] = disp_handle;

	return true;
	}

	bool DrmHwcTwo::UnbindDisplay(std::shared_ptr<DrmDisplayPipeline> pipeline) {
	if (display_handles_.count(pipeline) == 0) {
	ALOGE("%s, can't find the display, pipeline: %p", __func__, pipeline.get());
	return false;
	}
	auto handle = display_handles_[pipeline];
	display_handles_.erase(pipeline);

	ALOGI("Detaching the pipeline '%s' from the display #%i%s",
	pipeline->connector->Get()->GetName().c_str(), (int)handle,
	handle == kPrimaryDisplay ? " (Primary)" : "");

	if (displays_.count(handle) == 0) {
	ALOGE("%s, can't find the display, handle: %" PRIu64, __func__, handle);
	return false;
	}
	displays_[handle]->SetPipeline({});

	/* We must defer display disposal and removal, since it may still have pending
	* HWC_API calls scheduled and waiting until ueventlistener thread releases
	* main lock, otherwise transaction may fail and SF may crash
	*/
	if (handle != kPrimaryDisplay) {
	displays_for_removal_list_.emplace_back(handle);
	}
	return true;
	}

	HWC2::Error DrmHwcTwo::CreateVirtualDisplay(
	uint32_t width, uint32_t height,
	int32_t *format, // NOLINT(readability-non-const-parameter)
	hwc2_display_t *display) {
	ALOGI("Creating virtual display %dx%d format %d", width, height, *format);

	auto virtual_pipeline = resource_manager_.GetVirtualDisplayPipeline();
	if (!virtual_pipeline)
	return HWC2::Error::Unsupported;

	*display = ++last_display_handle_;
	auto disp = std::make_unique<HwcDisplay>(*display, HWC2::DisplayType::Virtual,
	this);

	disp->SetVirtualDisplayResolution(width, height);
	disp->SetPipeline(virtual_pipeline);
	displays_[*display] = std::move(disp);
	return HWC2::Error::None;
	}

	HWC2::Error DrmHwcTwo::DestroyVirtualDisplay(hwc2_display_t display) {
	ALOGI("Destroying virtual display %" PRIu64, display);

	if (displays_.count(display) == 0) {
	ALOGE("Trying to destroy non-existent display %" PRIu64, display);
	return HWC2::Error::BadDisplay;
	}

	displays_[display]->SetPipeline({});

	/* Wait 0.2s before removing the displays to flush pending HWC2 transactions
	*/
	auto &mutex = GetResMan().GetMainLock();
	mutex.unlock();
	const int kTimeForSFToDisposeDisplayUs = 200000;
	usleep(kTimeForSFToDisposeDisplayUs);
	mutex.lock();

	displays_.erase(display);

	return HWC2::Error::None;
	}

	void DrmHwcTwo::Dump(uint32_t outSize, char outBuffer) {
	if (outBuffer != nullptr) {
	auto copied_bytes = mDumpString.copy(outBuffer, *outSize);
	*outSize = static_cast<uint32_t>(copied_bytes);
	return;
	}

	std::stringstream output;

	output << "-- drm_hwcomposer --\n\n";

	for (auto &disp : displays_)
	output << disp.second->Dump();

	mDumpString = output.str();
	*outSize = static_cast<uint32_t>(mDumpString.size());
	}

	uint32_t DrmHwcTwo::GetMaxVirtualDisplayCount() {
	auto writeback_count = resource_manager_.GetWritebackConnectorsCount();
	writeback_count = std::min(writeback_count, 1U);
	/* Currently, only 1 virtual display is supported. Other cases need testing */
	ALOGI("Max virtual display count: %d", writeback_count);
	return writeback_count;
	}

	HWC2::Error DrmHwcTwo::RegisterCallback(int32_t descriptor,
	hwc2_callback_data_t data,
	hwc2_function_pointer_t function) {
	switch (static_cast<HWC2::Callback>(descriptor)) {
	case HWC2::Callback::Hotplug: {
	hotplug_callback_ = std::make_pair(HWC2_PFN_HOTPLUG(function), data);
	if (function != nullptr) {
	resource_manager_.Init();
	} else {
	resource_manager_.DeInit();
	/* Headless display may still be here. Remove it! */
	if (displays_.count(kPrimaryDisplay) != 0) {
	displays_[kPrimaryDisplay]->Deinit();
	displays_.erase(kPrimaryDisplay);
	}
	}
	break;
	}
	case HWC2::Callback::Refresh: {
	refresh_callback_ = std::make_pair(HWC2_PFN_REFRESH(function), data);
	break;
	}
	case HWC2::Callback::Vsync: {
	vsync_callback_ = std::make_pair(HWC2_PFN_VSYNC(function), data);
	break;
	}
	#if __ANDROID_API__ > 29
	case HWC2::Callback::Vsync_2_4: {
	vsync_2_4_callback_ = std::make_pair(HWC2_PFN_VSYNC_2_4(function), data);
	break;
	}
	case HWC2::Callback::VsyncPeriodTimingChanged: {
	period_timing_changed_callback_ = std::
	make_pair(HWC2_PFN_VSYNC_PERIOD_TIMING_CHANGED(function), data);
	break;
	}
	#endif
	default:
	break;
	}
	return HWC2::Error::None;
	}

	void DrmHwcTwo::SendHotplugEventToClient(hwc2_display_t displayid,
	bool connected) const {
	auto hc = hotplug_callback_;
	if (hc.first != nullptr && hc.second != nullptr) {
	/* For some reason HWC Service will call HWC2 API in hotplug callback
	* handler. This is the reason we're using recursive mutex.
	*/
	hc.first(hc.second, displayid,
	connected == DRM_MODE_CONNECTED ? HWC2_CONNECTION_CONNECTED
	: HWC2_CONNECTION_DISCONNECTED);
	}
	}

	void DrmHwcTwo::SendVsyncEventToClient(
	hwc2_display_t displayid, int64_t timestamp,
	[[maybe_unused]] uint32_t vsync_period) const {
	/* vsync callback */
	#if __ANDROID_API__ > 29
	if (vsync_2_4_callback_.first != nullptr &&
	vsync_2_4_callback_.second != nullptr) {
	vsync_2_4_callback_.first(vsync_2_4_callback_.second, displayid, timestamp,
	vsync_period);
	} else
	#endif
	if (vsync_callback_.first != nullptr &&
	vsync_callback_.second != nullptr) {
	vsync_callback_.first(vsync_callback_.second, displayid, timestamp);
	}
	}

	void DrmHwcTwo::SendVsyncPeriodTimingChangedEventToClient(
	[[maybe_unused]] hwc2_display_t displayid,
	[[maybe_unused]] int64_t timestamp) const {
	#if __ANDROID_API__ > 29
	hwc_vsync_period_change_timeline_t timeline = {
	.newVsyncAppliedTimeNanos = timestamp,
	.refreshRequired = false,
	.refreshTimeNanos = 0,
	};
	if (period_timing_changed_callback_.first != nullptr &&
	period_timing_changed_callback_.second != nullptr) {
	period_timing_changed_callback_
	.first(period_timing_changed_callback_.second, displayid, &timeline);
	}
	#endif
	}

	} // namespace android