suyu/src/core/hle/service/nvflinger/nvflinger.cpp

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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <optional>
#include "common/assert.h"
#include "common/logging/log.h"
#include "common/microprofile.h"
#include "common/scope_exit.h"
#include "common/settings.h"
#include "common/thread.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/hle/kernel/k_readable_event.h"
#include "core/hle/service/nvdrv/devices/nvdisp_disp0.h"
#include "core/hle/service/nvdrv/nvdrv.h"
#include "core/hle/service/nvflinger/buffer_queue.h"
#include "core/hle/service/nvflinger/nvflinger.h"
#include "core/hle/service/vi/display/vi_display.h"
#include "core/hle/service/vi/layer/vi_layer.h"
#include "video_core/gpu.h"
namespace Service::NVFlinger {
constexpr auto frame_ns = std::chrono::nanoseconds{1000000000 / 60};
void NVFlinger::SplitVSync(std::stop_token stop_token) {
system.RegisterHostThread();
std::string name = "yuzu:VSyncThread";
MicroProfileOnThreadCreate(name.c_str());
// Cleanup
SCOPE_EXIT({ MicroProfileOnThreadExit(); });
Common::SetCurrentThreadName(name.c_str());
Common::SetCurrentThreadPriority(Common::ThreadPriority::High);
s64 delay = 0;
while (!stop_token.stop_requested()) {
guard->lock();
const s64 time_start = system.CoreTiming().GetGlobalTimeNs().count();
Compose();
const auto ticks = GetNextTicks();
const s64 time_end = system.CoreTiming().GetGlobalTimeNs().count();
const s64 time_passed = time_end - time_start;
const s64 next_time = std::max<s64>(0, ticks - time_passed - delay);
guard->unlock();
if (next_time > 0) {
std::this_thread::sleep_for(std::chrono::nanoseconds{next_time});
}
delay = (system.CoreTiming().GetGlobalTimeNs().count() - time_end) - next_time;
}
}
NVFlinger::NVFlinger(Core::System& system_)
: system(system_), service_context(system_, "nvflinger") {
displays.emplace_back(0, "Default", service_context, system);
displays.emplace_back(1, "External", service_context, system);
displays.emplace_back(2, "Edid", service_context, system);
displays.emplace_back(3, "Internal", service_context, system);
displays.emplace_back(4, "Null", service_context, system);
guard = std::make_shared<std::mutex>();
// Schedule the screen composition events
composition_event = Core::Timing::CreateEvent(
"ScreenComposition", [this](std::uintptr_t, std::chrono::nanoseconds ns_late) {
const auto lock_guard = Lock();
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Compose();
const auto ticks = std::chrono::nanoseconds{GetNextTicks()};
const auto ticks_delta = ticks - ns_late;
const auto future_ns = std::max(std::chrono::nanoseconds::zero(), ticks_delta);
this->system.CoreTiming().ScheduleEvent(future_ns, composition_event);
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});
if (system.IsMulticore()) {
vsync_thread = std::jthread([this](std::stop_token token) { SplitVSync(token); });
} else {
system.CoreTiming().ScheduleEvent(frame_ns, composition_event);
}
}
NVFlinger::~NVFlinger() {
for (auto& buffer_queue : buffer_queues) {
buffer_queue->Disconnect();
}
if (!system.IsMulticore()) {
system.CoreTiming().UnscheduleEvent(composition_event, 0);
}
}
void NVFlinger::SetNVDrvInstance(std::shared_ptr<Nvidia::Module> instance) {
nvdrv = std::move(instance);
}
std::optional<u64> NVFlinger::OpenDisplay(std::string_view name) {
const auto lock_guard = Lock();
LOG_DEBUG(Service, "Opening \"{}\" display", name);
const auto itr =
std::find_if(displays.begin(), displays.end(),
[&](const VI::Display& display) { return display.GetName() == name; });
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if (itr == displays.end()) {
return std::nullopt;
}
return itr->GetID();
}
std::optional<u64> NVFlinger::CreateLayer(u64 display_id) {
const auto lock_guard = Lock();
auto* const display = FindDisplay(display_id);
if (display == nullptr) {
return std::nullopt;
}
const u64 layer_id = next_layer_id++;
CreateLayerAtId(*display, layer_id);
return layer_id;
}
void NVFlinger::CreateLayerAtId(VI::Display& display, u64 layer_id) {
const u32 buffer_queue_id = next_buffer_queue_id++;
buffer_queues.emplace_back(
std::make_unique<BufferQueue>(system.Kernel(), buffer_queue_id, layer_id, service_context));
display.CreateLayer(layer_id, *buffer_queues.back());
}
void NVFlinger::CloseLayer(u64 layer_id) {
const auto lock_guard = Lock();
for (auto& display : displays) {
display.CloseLayer(layer_id);
}
}
std::optional<u32> NVFlinger::FindBufferQueueId(u64 display_id, u64 layer_id) {
const auto lock_guard = Lock();
const auto* const layer = FindOrCreateLayer(display_id, layer_id);
if (layer == nullptr) {
return std::nullopt;
}
return layer->GetBufferQueue().GetId();
}
Kernel::KReadableEvent* NVFlinger::FindVsyncEvent(u64 display_id) {
const auto lock_guard = Lock();
auto* const display = FindDisplay(display_id);
if (display == nullptr) {
return nullptr;
}
return &display->GetVSyncEvent();
}
BufferQueue* NVFlinger::FindBufferQueue(u32 id) {
const auto lock_guard = Lock();
const auto itr = std::find_if(buffer_queues.begin(), buffer_queues.end(),
[id](const auto& queue) { return queue->GetId() == id; });
if (itr == buffer_queues.end()) {
return nullptr;
}
return itr->get();
}
VI::Display* NVFlinger::FindDisplay(u64 display_id) {
const auto itr =
std::find_if(displays.begin(), displays.end(),
[&](const VI::Display& display) { return display.GetID() == display_id; });
if (itr == displays.end()) {
return nullptr;
}
return &*itr;
}
const VI::Display* NVFlinger::FindDisplay(u64 display_id) const {
const auto itr =
std::find_if(displays.begin(), displays.end(),
[&](const VI::Display& display) { return display.GetID() == display_id; });
if (itr == displays.end()) {
return nullptr;
}
return &*itr;
}
VI::Layer* NVFlinger::FindLayer(u64 display_id, u64 layer_id) {
auto* const display = FindDisplay(display_id);
if (display == nullptr) {
return nullptr;
}
return display->FindLayer(layer_id);
}
const VI::Layer* NVFlinger::FindLayer(u64 display_id, u64 layer_id) const {
const auto* const display = FindDisplay(display_id);
if (display == nullptr) {
return nullptr;
}
return display->FindLayer(layer_id);
}
VI::Layer* NVFlinger::FindOrCreateLayer(u64 display_id, u64 layer_id) {
auto* const display = FindDisplay(display_id);
if (display == nullptr) {
return nullptr;
}
auto* layer = display->FindLayer(layer_id);
if (layer == nullptr) {
LOG_DEBUG(Service, "Layer at id {} not found. Trying to create it.", layer_id);
CreateLayerAtId(*display, layer_id);
return display->FindLayer(layer_id);
}
return layer;
}
void NVFlinger::Compose() {
for (auto& display : displays) {
// Trigger vsync for this display at the end of drawing
SCOPE_EXIT({ display.SignalVSyncEvent(); });
// Don't do anything for displays without layers.
if (!display.HasLayers())
continue;
// TODO(Subv): Support more than 1 layer.
VI::Layer& layer = display.GetLayer(0);
auto& buffer_queue = layer.GetBufferQueue();
// Search for a queued buffer and acquire it
auto buffer = buffer_queue.AcquireBuffer();
if (!buffer) {
continue;
}
const auto& igbp_buffer = buffer->get().igbp_buffer;
if (!system.IsPoweredOn()) {
return; // We are likely shutting down
}
auto& gpu = system.GPU();
const auto& multi_fence = buffer->get().multi_fence;
guard->unlock();
for (u32 fence_id = 0; fence_id < multi_fence.num_fences; fence_id++) {
const auto& fence = multi_fence.fences[fence_id];
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gpu.WaitFence(fence.id, fence.value);
}
guard->lock();
MicroProfileFlip();
// Now send the buffer to the GPU for drawing.
// TODO(Subv): Support more than just disp0. The display device selection is probably based
// on which display we're drawing (Default, Internal, External, etc)
auto nvdisp = nvdrv->GetDevice<Nvidia::Devices::nvdisp_disp0>("/dev/nvdisp_disp0");
ASSERT(nvdisp);
nvdisp->flip(igbp_buffer.gpu_buffer_id, igbp_buffer.offset, igbp_buffer.external_format,
igbp_buffer.width, igbp_buffer.height, igbp_buffer.stride,
buffer->get().transform, buffer->get().crop_rect);
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swap_interval = buffer->get().swap_interval;
buffer_queue.ReleaseBuffer(buffer->get().slot);
}
}
s64 NVFlinger::GetNextTicks() const {
static constexpr s64 max_hertz = 120LL;
const auto& settings = Settings::values;
const bool unlocked_fps = settings.disable_fps_limit.GetValue();
const s64 fps_cap = unlocked_fps ? static_cast<s64>(settings.fps_cap.GetValue()) : 1;
return (1000000000 * (1LL << swap_interval)) / (max_hertz * fps_cap);
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}
} // namespace Service::NVFlinger