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#pragma once
#include <c10/core/impl/DeviceGuardImplInterface.h>
#include <c10/macros/Macros.h>
#include <c10/util/Exception.h>
#include <c10/cuda/CUDAException.h>
#include <c10/cuda/CUDAStream.h>
#include <c10/cuda/CUDAFunctions.h>
#include <cuda_runtime_api.h>
namespace c10 {
namespace cuda {
namespace impl {
struct CUDAGuardImpl final : public c10::impl::DeviceGuardImplInterface {
static constexpr DeviceType static_type = DeviceType::CUDA;
CUDAGuardImpl() {}
explicit CUDAGuardImpl(DeviceType t) {
TORCH_INTERNAL_ASSERT(t == DeviceType::CUDA);
}
DeviceType type() const override {
return DeviceType::CUDA;
}
Device exchangeDevice(Device d) const override {
TORCH_INTERNAL_ASSERT(d.type() == DeviceType::CUDA);
Device old_device = getDevice();
if (old_device.index() != d.index()) {
C10_CUDA_CHECK(cudaSetDevice(d.index()));
}
return old_device;
}
Device getDevice() const override {
int device;
C10_CUDA_CHECK(cudaGetDevice(&device));
return Device(DeviceType::CUDA, device);
}
c10::optional<Device> uncheckedGetDevice() const noexcept {
int device;
auto err = cudaGetDevice(&device);
C10_CUDA_CHECK_WARN(err);
if (err != cudaSuccess) {
return c10::nullopt;
}
return Device(DeviceType::CUDA, device);
}
void setDevice(Device d) const override {
TORCH_INTERNAL_ASSERT(d.type() == DeviceType::CUDA);
Device current_device = getDevice();
if (current_device != d) {
C10_CUDA_CHECK(cudaSetDevice(d.index()));
}
}
void uncheckedSetDevice(Device d) const noexcept override {
auto current_device = uncheckedGetDevice();
if (!current_device.has_value() || current_device.value() != d) {
C10_CUDA_CHECK_WARN(cudaSetDevice(d.index()));
}
}
Stream getStream(Device d) const noexcept override {
return getCurrentCUDAStream(d.index()).unwrap();
}
Stream getDefaultStream(Device d) const override {
return getDefaultCUDAStream(d.index());
}
// NB: These do NOT set the current device
Stream exchangeStream(Stream s) const noexcept override {
CUDAStream cs(s);
auto old_stream = getCurrentCUDAStream(s.device().index());
setCurrentCUDAStream(cs);
return old_stream.unwrap();
}
DeviceIndex deviceCount() const noexcept override {
return device_count();
}
// Event-related functions
void createEvent(
cudaEvent_t* cuda_event,
const EventFlag flag) const {
// Maps PyTorch's Event::Flag to CUDA flag
auto cuda_flag = cudaEventDefault;
switch (flag) {
case EventFlag::PYTORCH_DEFAULT:
case EventFlag::CUDA_EVENT_DISABLE_TIMING:
cuda_flag = cudaEventDisableTiming;
break;
case EventFlag::BACKEND_DEFAULT:
case EventFlag::CUDA_EVENT_DEFAULT:
cuda_flag = cudaEventDefault;
break;
default:
TORCH_CHECK(false, "CUDA event received unknown flag");
}
C10_CUDA_CHECK(cudaEventCreateWithFlags(cuda_event, cuda_flag));
}
void destroyEvent(
void* event,
const DeviceIndex device_index) const noexcept override {
if (!event) return;
auto cuda_event = static_cast<cudaEvent_t>(event);
int orig_device;
C10_CUDA_CHECK_WARN(cudaGetDevice(&orig_device));
C10_CUDA_CHECK_WARN(cudaSetDevice(device_index));
C10_CUDA_CHECK_WARN(cudaEventDestroy(cuda_event));
C10_CUDA_CHECK_WARN(cudaSetDevice(orig_device));
}
void record(
void** event,
const Stream& stream,
const DeviceIndex device_index,
const EventFlag flag) const override {
TORCH_CHECK(device_index == -1 || device_index == stream.device_index(),
"Event device index ",
device_index,
" does not match recording stream's device index ",
stream.device_index(),
".");
cudaEvent_t cuda_event = static_cast<cudaEvent_t>(*event);
CUDAStream cuda_stream{stream};
// Moves to stream's device to record
const auto orig_device = getDevice();
setDevice(stream.device());
// Creates the event (lazily)
if (!cuda_event) createEvent(&cuda_event, flag);
C10_CUDA_CHECK(cudaEventRecord(cuda_event, cuda_stream));
// Makes the void* point to the (possibly just allocated) CUDA event
*event = cuda_event;
// Resets device
setDevice(orig_device);
}
void block(
void* event,
const Stream& stream) const override {
if (!event) return;
cudaEvent_t cuda_event = static_cast<cudaEvent_t>(event);
CUDAStream cuda_stream{stream};
const auto orig_device = getDevice();
setDevice(stream.device());
C10_CUDA_CHECK(cudaStreamWaitEvent(
cuda_stream,
cuda_event,
/*flags (must be zero)=*/ 0));
setDevice(orig_device);
}
// May be called from any device
bool queryEvent(void* event) const override {
if (!event) return true;
cudaEvent_t cuda_event = static_cast<cudaEvent_t>(event);
const cudaError_t err = cudaEventQuery(cuda_event);
if (err != cudaErrorNotReady) {
C10_CUDA_CHECK(err);
}
return (err == cudaSuccess);
}
};
}}} // namespace c10::cuda::impl
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