rocm-systems/tests/src/runtimeApi/memory/hipHostRegister.cpp

/*
Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
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furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
*/

/* HIT_START
 * BUILD: %t %s ../../test_common.cpp
 * RUN: %t
 * HIT_END
 */

#include"test_common.h"
#include<malloc.h>

__global__ void Inc(hipLaunchParm lp, float *Ad){
int tx = hipThreadIdx_x + hipBlockIdx_x * hipBlockDim_x;
Ad[tx] = Ad[tx] + float(1);
}

int main(){
	float *A, **Ad;
	int num_devices;
	HIPCHECK(hipGetDeviceCount(&num_devices));
	Ad = new float*[num_devices];
	const size_t size = N * sizeof(float);
	A = (float*)malloc(size);
	HIPCHECK(hipHostRegister(A, size, 0));


	for(int i=0;i<N;i++){
		A[i] = float(1);
	}


	for(int i=0;i<num_devices;i++){
        HIPCHECK(hipSetDevice(i));
        HIPCHECK(hipHostGetDevicePointer((void**)&Ad[i], A, 0));
	}

    // Use device pointer inside a kernel:
	for(int i=0;i<num_devices;i++){
        HIPCHECK(hipSetDevice(i));
        hipLaunchKernel(HIP_KERNEL_NAME(Inc), dim3(N/512), dim3(512), 0, 0, Ad[i]);

        HIPCHECK(hipDeviceSynchronize());
	}


    { 
        // Senstizes HIP bug if device does not match where the memory was registered.
        HIPCHECK(hipSetDevice(0));

        // Copy to B, this should be optimal pinned malloc copy:
        // Note we are using the host pointer here:
        float *Bh, *Bd;
        Bh = (float*)malloc(size);
        HIPCHECK(hipMalloc(&Bd, size));

        for(int i=0;i<N;i++){
            A[i] = float(i);
            Bh[i] = 0.0f;
        }

        HIPCHECK(hipMemcpy(Bd, A, size,  hipMemcpyHostToDevice));

        HIPCHECK(hipMemcpy(Bh, Bd, size, hipMemcpyDeviceToHost));

#if 0
        //TODO - disable check until we update HCC to deal with registered memory pointers.
        for(int i=0;i<N;i++){
            if (Bh[i] != A[i]) {
                printf ("mismatch at Bh[%d]=%f, A[%d]=%f\n", i, Bh[i], i, A[i]);
                failed("mismatch");
            };
        }
#endif



        // Make sure the copy worked
    }



	HIPASSERT(A[10] == 1.0f + float(num_devices));
	HIPCHECK(hipHostUnregister(A));
	passed();
}