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[mlir] Initialize CUDA context lazily.

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So we can remove the ignore-warning pragma again.

Reviewed By: herhut

Differential Revision: https://reviews.llvm.org/D97864
This commit is contained in:
Christian Sigg 2021-03-03 17:35:02 +01:00
parent b7aeece47c
commit f69d5a7fc7
1 changed files with 15 additions and 21 deletions
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36
mlir/lib/ExecutionEngine/CudaRuntimeWrappers.cpp
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@ -37,32 +37,26 @@
fprintf(stderr, "'%s' failed with '%s'\n", #expr, name); \
}(expr)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
// Static reference to CUDA primary context for device ordinal 0.
static CUcontext Context = [] {
CUDA_REPORT_IF_ERROR(cuInit(/*flags=*/0));
CUdevice device;
CUDA_REPORT_IF_ERROR(cuDeviceGet(&device, /*ordinal=*/0));
CUcontext context;
CUDA_REPORT_IF_ERROR(cuDevicePrimaryCtxRetain(&context, device));
return context;
}();
#pragma clang diagnostic pop
// Sets the `Context` for the duration of the instance and restores the previous
// context on destruction.
// Make the primary context of device 0 current for the duration of the instance
// and restore the previous context on destruction.
class ScopedContext {
public:
ScopedContext() {
CUDA_REPORT_IF_ERROR(cuCtxGetCurrent(&previous));
CUDA_REPORT_IF_ERROR(cuCtxSetCurrent(Context));
// Static reference to CUDA primary context for device ordinal 0.
static CUcontext context = [] {
CUDA_REPORT_IF_ERROR(cuInit(/*flags=*/0));
CUdevice device;
CUDA_REPORT_IF_ERROR(cuDeviceGet(&device, /*ordinal=*/0));
CUcontext ctx;
// Note: this does not affect the current context.
CUDA_REPORT_IF_ERROR(cuDevicePrimaryCtxRetain(&ctx, device));
return ctx;
}();
CUDA_REPORT_IF_ERROR(cuCtxPushCurrent(context));
}
~ScopedContext() { CUDA_REPORT_IF_ERROR(cuCtxSetCurrent(previous)); }
private:
CUcontext previous;
~ScopedContext() { CUDA_REPORT_IF_ERROR(cuCtxPopCurrent(nullptr)); }
};
extern "C" MLIR_CUDA_WRAPPERS_EXPORT CUmodule mgpuModuleLoad(void *data) {