buffer.cu

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/*
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#include <device/device_config.h>
#include <device/cuda/check.h>
#include <device/cuda/buffer.h>
 
#ifdef HAVE_NVSHMEM
#include <nvshmem.h>
#endif
 
extern "C" {
 
  static cuda_buffer_t *buffer_registry = NULL;
 
  void cuda_buffer_reserve(cuda_buffer_t *buf, size_t size) {
 
    if (size <= buf->size)
      return;
 
    if (buf->dev != NULL) {
      if (buf->host != NULL)
        CUDA_CHECK(cudaFreeHost(buf->host));
#ifdef HAVE_NVSHMEM
      if (buf->symm)
        nvshmem_free(buf->dev);
      else
        CUDA_CHECK(cudaFree(buf->dev));
#else
      CUDA_CHECK(cudaFree(buf->dev));
#endif
    }
 
    if (!buf->dev_only)
      CUDA_CHECK(cudaMallocHost(&buf->host, size));
#ifdef HAVE_NVSHMEM
    if (buf->symm)
      buf->dev = nvshmem_malloc(size);
    else
      CUDA_CHECK(cudaMalloc(&buf->dev, size));
#else
    CUDA_CHECK(cudaMalloc(&buf->dev, size));
#endif
    buf->size = size;
 
    if (!buf->registered) {
      buf->next = buffer_registry;
      buffer_registry = buf;
      buf->registered = 1;
    }
  }
 
  void cuda_buffer_free_all(void) {
    cuda_buffer_t *buf = buffer_registry;
 
    while (buf != NULL) {
      cuda_buffer_t *next = buf->next;
      if (buf->host != NULL) {
        CUDA_CHECK(cudaFreeHost(buf->host));
        buf->host = NULL;
      }
      if (buf->dev != NULL) {
#ifdef HAVE_NVSHMEM
        if (buf->symm)
          nvshmem_free(buf->dev);
        else
          CUDA_CHECK(cudaFree(buf->dev));
#else
        CUDA_CHECK(cudaFree(buf->dev));
#endif
        buf->dev = NULL;
      }
      buf->size = 0;
      buf->registered = 0;
      buf->next = NULL;
      buf = next;
    }
    buffer_registry = NULL;
  }
 
}