libhsakmt: add event age tracking

Keeping last signaled event age to avoid race conditions
for HSA_EVENTTYPE_SIGNAL when event age init value is non-zero.

Change-Id: Ifb9a11a6868e5762a9f92f579e45a0a2c8fa1017
Signed-off-by: James Zhu <James.Zhu@amd.com>

include/hsakmt.h

@@ -243,6 +243,25 @@ hsaKmtWaitOnEvent(
     HSAuint32   Milliseconds    //IN
     );
 
+/**
+  Checks the current state of the event object. If the object's state is
+  nonsignaled, the calling thread enters the wait state. event_age can
+  help avoiding race conditions.
+
+ The function returns when one of the following occurs:
+- The specified event object is in the signaled state.
+- The time-out interval elapses.
+- Tracking event age
+*/
+
+HSAKMT_STATUS
+HSAKMTAPI
+hsaKmtWaitOnEvent_Ext(
+    HsaEvent*   Event,          //IN
+    HSAuint32   Milliseconds,   //IN
+    uint64_t   *event_age       //IN/OUT
+    );
+
 /**
   Checks the current state of multiple event objects.
 
@@ -264,6 +283,30 @@ hsaKmtWaitOnMultipleEvents(
     HSAuint32   Milliseconds    //IN
     );
 
+/**
+  Checks the current state of multiple event objects.
+  event_age can help avoiding race conditions.
+
+ The function returns when one of the following occurs:
+- Either any one or all of the specified objects are in the signaled state
+  - if "WaitOnAll" is "true" the function returns when the state of all
+    objects in array is signaled
+  - if "WaitOnAll" is "false" the function returns when the state of any
+    one of the objects is set to signaled
+- The time-out interval elapses.
+- Tracking event age
+*/
+
+HSAKMT_STATUS
+HSAKMTAPI
+hsaKmtWaitOnMultipleEvents_Ext(
+    HsaEvent*   Events[],       //IN
+    HSAuint32   NumEvents,      //IN
+    bool        WaitOnAll,      //IN
+    HSAuint32   Milliseconds,   //IN
+    uint64_t   *event_age       //IN/OUT
+    );
+
 /**
   new TEMPORARY function definition - to be used only on "Triniti + Southern Islands" platform
   If used on other platforms the function will return HSAKMT_STATUS_ERROR

include/linux/kfd_ioctl.h

@@ -39,9 +39,10 @@
  * - 1.11 - Add unified memory for ctx save/restore area
  * - 1.12 - Add DMA buf export ioctl
  * - 1.13 - Add debugger API
+ * - 1.14 - Update kfd_event_data
  */
 #define KFD_IOCTL_MAJOR_VERSION 1
-#define KFD_IOCTL_MINOR_VERSION 13
+#define KFD_IOCTL_MINOR_VERSION 14
 
 /*
  * Debug revision change log
@@ -979,12 +980,20 @@ struct kfd_hsa_hw_exception_data {
 	__u32 gpu_id;
 };
 
+/* hsa signal event data */
+struct kfd_hsa_signal_event_data {
+	__u64 last_event_age;	/* to and from KFD */
+};
+
 /* Event data */
 struct kfd_event_data {
 	union {
+		/* From KFD */
 		struct kfd_hsa_memory_exception_data memory_exception_data;
 		struct kfd_hsa_hw_exception_data hw_exception_data;
-	};				/* From KFD */
+		/* To and From KFD */
+		struct kfd_hsa_signal_event_data signal_event_data;
+	};
 	__u64 kfd_event_data_ext;	/* pointer to an extension structure
 					   for future exception types */
 	__u32 event_id;		/* to KFD */