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#include "cuda-compute-util.h"
#include "../../slang-com-helper.h"
#include "../../source/core/slang-std-writers.h"
#include "../../source/core/slang-token-reader.h"
#include <cuda.h>
#include <cuda_runtime_api.h>
namespace renderer_test {
using namespace Slang;
#define SLANG_CUDA_RETURN_ON_FAIL(x) { int _res = (int)(x); if (_res != 0) return SLANG_FAIL; }
static int _calcSMCountPerMultiProcessor(int major, int minor)
{
// Defines for GPU Architecture types (using the SM version to determine
// the # of cores per SM
struct SMInfo
{
int sm; // 0xMm (hexadecimal notation), M = SM Major version, and m = SM minor version
int coreCount;
};
static const SMInfo infos[] =
{
{0x30, 192},
{0x32, 192},
{0x35, 192},
{0x37, 192},
{0x50, 128},
{0x52, 128},
{0x53, 128},
{0x60, 64},
{0x61, 128},
{0x62, 128},
{0x70, 64},
{0x72, 64},
{0x75, 64}
};
const int sm = ((major << 4) + minor);
for (Index i = 0; i < SLANG_COUNT_OF(infos); ++i)
{
if (infos[i].sm == sm)
{
return infos[i].coreCount;
}
}
const auto& last = infos[SLANG_COUNT_OF(infos) - 1];
// It must be newer presumably
SLANG_ASSERT(sm > last.coreCount );
// Default to the last entry
return last.coreCount;
}
static SlangResult _findMaxFlopsDeviceId(int* outDevice)
{
int smPerMultiproc = 0;
int maxPerfDevice = -1;
int deviceCount = 0;
int devicesProhibited = 0;
uint64_t maxComputePerf = 0;
SLANG_CUDA_RETURN_ON_FAIL(cudaGetDeviceCount(&deviceCount));
// Find the best CUDA capable GPU device
for (int currentDevice = 0; currentDevice < deviceCount; ++currentDevice)
{
int computeMode = -1, major = 0, minor = 0;
SLANG_CUDA_RETURN_ON_FAIL(cudaDeviceGetAttribute(&computeMode, cudaDevAttrComputeMode, currentDevice));
SLANG_CUDA_RETURN_ON_FAIL(cudaDeviceGetAttribute(&major, cudaDevAttrComputeCapabilityMajor, currentDevice));
SLANG_CUDA_RETURN_ON_FAIL(cudaDeviceGetAttribute(&minor, cudaDevAttrComputeCapabilityMinor, currentDevice));
// If this GPU is not running on Compute Mode prohibited,
// then we can add it to the list
if (computeMode != cudaComputeModeProhibited)
{
if (major == 9999 && minor == 9999)
{
smPerMultiproc = 1;
}
else
{
smPerMultiproc = _calcSMCountPerMultiProcessor(major, minor);
}
int multiProcessorCount = 0, clockRate = 0;
SLANG_CUDA_RETURN_ON_FAIL(cudaDeviceGetAttribute(&multiProcessorCount, cudaDevAttrMultiProcessorCount, currentDevice));
SLANG_CUDA_RETURN_ON_FAIL(cudaDeviceGetAttribute(&clockRate, cudaDevAttrClockRate, currentDevice));
uint64_t compute_perf = uint64_t(multiProcessorCount) * smPerMultiproc * clockRate;
if (compute_perf > maxComputePerf)
{
maxComputePerf = compute_perf;
maxPerfDevice = currentDevice;
}
}
else
{
devicesProhibited++;
}
}
if (maxPerfDevice < 0)
{
return SLANG_FAIL;
}
*outDevice = maxPerfDevice;
return SLANG_OK;
}
static SlangResult _initCuda()
{
static CUresult res = cuInit(0);
SLANG_CUDA_RETURN_ON_FAIL(res);
return SLANG_OK;
}
/* static */SlangResult _createDevice(CUcontext* outContext)
{
SLANG_RETURN_ON_FAIL(_initCuda());
int deviceId;
SLANG_RETURN_ON_FAIL(_findMaxFlopsDeviceId(&deviceId));
SLANG_CUDA_RETURN_ON_FAIL(cudaSetDevice(deviceId));
CUcontext context;
// Create context
SLANG_CUDA_RETURN_ON_FAIL(cuCtxCreate(&context, 0, deviceId));
*outContext = context;
return SLANG_OK;
}
/* static */bool CUDAComputeUtil::canCreateDevice()
{
CUcontext context;
if (SLANG_SUCCEEDED(_createDevice(&context)))
{
cuCtxDestroy(context);
return true;
}
return false;
}
static SlangResult _compute(CUcontext context, CUmodule module, const ShaderCompilerUtil::OutputAndLayout& outputAndLayout)
{
auto request = outputAndLayout.output.request;
auto reflection = (slang::ShaderReflection*) spGetReflection(request);
slang::EntryPointReflection* entryPoint = nullptr;
auto entryPointCount = reflection->getEntryPointCount();
SLANG_ASSERT(entryPointCount == 1);
entryPoint = reflection->getEntryPointByIndex(0);
const char* entryPointName = entryPoint->getName();
// Get the entry point
CUfunction kernel;
SLANG_CUDA_RETURN_ON_FAIL(cuModuleGetFunction(&kernel, module, entryPointName));
return SLANG_OK;
}
/* static */SlangResult CUDAComputeUtil::execute(const ShaderCompilerUtil::OutputAndLayout& outputAndLayout)
{
CUcontext context;
SLANG_RETURN_ON_FAIL(_createDevice(&context));
const Index index = outputAndLayout.output.findKernelDescIndex(StageType::Compute);
if (index < 0)
{
return SLANG_FAIL;
}
const auto& kernel = outputAndLayout.output.kernelDescs[index];
CUmodule module = 0;
SLANG_CUDA_RETURN_ON_FAIL(cuModuleLoadData(&module, kernel.codeBegin));
SLANG_RETURN_ON_FAIL(_compute(context, module, outputAndLayout));
SLANG_CUDA_RETURN_ON_FAIL(cuModuleUnload(module));
cuCtxDestroy(context);
return SLANG_OK;
}
} // renderer_test
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