Update function to append default device qualifier.

src/components/cuda/cupti_profiler.c

@@ -2578,8 +2578,9 @@ static int evt_name_to_basename(const char *name, char *base, int len)
 }
 
 /** @class evt_name_to_device
-  * @brief Take a Cuda native event name with a device qualifer appended to 
-  *        it and collect the device number.
+  * @brief Return the device number for a user provided Cuda native event.
+  *        This can be done with a device qualifier present (:device=#) or
+  *        we internally find the first device the native event exists for.
   * @param *name
   *   Cuda native event name with a device qualifier appended.
   * @param *device
@@ -2588,11 +2589,27 @@ static int evt_name_to_basename(const char *name, char *base, int len)
 static int evt_name_to_device(const char *name, int *device)
 {
     char *p = strstr(name, ":device=");
+    // User did provide :device=# qualifier
     if (p) {
         *device = (int) strtol(p + strlen(":device="), NULL, 10);
     }
+    // User did not provide :device=# qualifier
     else {
-        *device = 0;
+        int i, htable_errno;
+        cuptiu_event_t *event;
+
+        htable_errno = htable_find(cuptiu_table_p->htable, name, (void **) &event);
+        if (htable_errno != HTABLE_SUCCESS) {
+            return PAPI_EINVAL;
+        }
+
+        // Search for the first device the event exists for.
+        for (i = 0; i < num_gpus; ++i) {
+            if (cuptiu_dev_check(event->device_map, i)) {
+                *device = i;
+                break;
+            }
+        }
     }
     return PAPI_OK;
 }