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[SYCL] handle wrap around in HW timestamp #2571

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Merged
merged 2 commits into from
Sep 30, 2020
Merged

[SYCL] handle wrap around in HW timestamp #2571

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f988a67
[SYCL] handle wrap around in HW timestamp
smaslov-intel Sep 30, 2020
8cb3677
rewrite shift left of negative value
smaslov-intel Sep 30, 2020
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13 changes: 13 additions & 0 deletions sycl/plugins/level_zero/pi_level_zero.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3100,7 +3100,20 @@ pi_result piEventGetProfilingInfo(pi_event Event, pi_profiling_info ParamName,
case PI_PROFILING_INFO_COMMAND_END: {
zeEventQueryKernelTimestamp(Event->ZeEvent, &tsResult);

uint64_t ContextStartTime = tsResult.context.kernelStart;
uint64_t ContextEndTime = tsResult.context.kernelEnd;
//
// Handle a possible wrap-around (the underlying HW counter is < 64-bit).
// Note, it will not report correct time if there were multiple wrap
// arounds, and the longer term plan is to enlarge the capacity of the
// HW timestamps.
//
if (ContextEndTime <= ContextStartTime) {
pi_device Device = Event->Context->Devices[0];
const uint64_t TimestampMaxValue =
(1LL << Device->ZeDeviceProperties.kernelTimestampValidBits) - 1;
ContextEndTime += TimestampMaxValue - ContextStartTime;
}
ContextEndTime *= ZeTimerResolution;

return ReturnValue(uint64_t{ContextEndTime});
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