Add HIP_DB=warn + message if sync on dangerous event.

hipamd/src/hip_event.cpp

@@ -191,6 +191,10 @@ hipError_t hipEventSynchronize(hipEvent_t event)
 {
     HIP_INIT_SPECIAL_API(TRACE_SYNC, event);
 
+    if (!(event->_flags & hipEventReleaseToSystem)) {
+        tprintf(DB_WARN, "hipEventSynchronize on event without system-scope fence ; consider creating with hipEventReleaseToSystem\n");
+    }
+
     if (event) {
         if (event->_state == hipEventStatusUnitialized) {
             return ihipLogStatus(hipErrorInvalidResourceHandle);
@@ -268,6 +272,10 @@ hipError_t hipEventQuery(hipEvent_t event)
 {
     HIP_INIT_SPECIAL_API(TRACE_QUERY, event);
 
+    if (!(event->_flags & hipEventReleaseToSystem)) {
+        tprintf(DB_WARN, "hipEventQuery on event without system-scope fence ; consider creating with hipEventReleaseToSystem\n");
+    }
+
     if ((event->_state == hipEventStatusRecording) && !event->locked_isReady()) {
         return ihipLogStatus(hipErrorNotReady);
     } else {

hipamd/src/hip_hcc_internal.h

@@ -209,7 +209,8 @@ extern const char *API_COLOR_END;
 #define DB_SYNC   1 /* 0x02 - trace synchronization pieces */
 #define DB_MEM    2 /* 0x04 - trace memory allocation / deallocation */
 #define DB_COPY   3 /* 0x08 - trace memory copy and peer commands. . */
-#define DB_MAX_FLAG 4
+#define DB_WARN   4 /* 0x10 - warn about sub-optimal or shady behavior */
+#define DB_MAX_FLAG 5
 // When adding a new debug flag, also add to the char name table below.
 //
 //
@@ -226,6 +227,7 @@ static const DbName dbName [] =
     {KYEL, "sync"},
     {KCYN, "mem"},
     {KMAG, "copy"},
+    {KRED, "warn"},
 };