accelerator/cuda: Account for possibility that cuda will never be initialized

When the accelerator cuda component was first implemented,
if cuda was not initialized, the component would not be selected.
Therefore some logic was implemented with the assumption that
the initialization would have already happened.

After delayed initialization logic was added, the check
addr functions could be entered and would return an error if
cuda was not already initialized. Since cuda may never
be initialized, this patch adds some assumptions that the buffers
are host buffers if initialization does not pass.

Signed-off-by: William Zhang <wilzhang@amazon.com>

Author: wckzhang

opal/mca/accelerator/cuda/accelerator_cuda.c

@@ -109,8 +109,12 @@ static int accelerator_cuda_check_addr(const void *addr, int *dev_id, uint64_t *
         *flags |= MCA_ACCELERATOR_FLAGS_UNIFIED_MEMORY;
     }
     if (CUDA_SUCCESS != result) {
-        /* Cannot identify, return an error */
-        return -1;
+        /* If cuda is not initialized, assume it is a host buffer. */
+        if (CUDA_ERROR_NOT_INITIALIZED == result) {
+            return 0;
+        } else {
+            return OPAL_ERROR;
+        }
     } else if (CU_MEMORYTYPE_HOST == mem_type) {
         /* Host memory, nothing to do here */
         return 0;
@@ -123,9 +127,12 @@ static int accelerator_cuda_check_addr(const void *addr, int *dev_id, uint64_t *
 #else /* OPAL_CUDA_GET_ATTRIBUTES */
     result = cuPointerGetAttribute(&mem_type, CU_POINTER_ATTRIBUTE_MEMORY_TYPE, dbuf);
     if (CUDA_SUCCESS != result) {
-        /* If we cannot determine it is device pointer,
-         * just assume it is not. */
-        return 0;
+        /* If cuda is not initialized, assume it is a host buffer. */
+        if (CUDA_ERROR_NOT_INITIALIZED == result) {
+            return 0;
+        } else {
+            return OPAL_ERROR;
+        }
     } else if (CU_MEMORYTYPE_HOST == mem_type) {
         /* Host memory, nothing to do here */
         return 0;