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[SYCL][LevelZero] Add support to detect host->device and device->host transfers for USM #3975

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Merged
merged 3 commits into from
Jun 23, 2021
Merged

[SYCL][LevelZero] Add support to detect host->device and device->host transfers for USM #3975

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0fc4133
Add support to detect host->device and device->host transfers for USM…
asudarsa Jun 22, 2021
af8695d
Modifying check for device to device copies
asudarsa Jun 22, 2021
ffa7136
Fix wrong boolean operation
asudarsa Jun 22, 2021
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19 changes: 18 additions & 1 deletion sycl/plugins/level_zero/pi_level_zero.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6129,6 +6129,19 @@ pi_result piextUSMEnqueueMemset(pi_queue Queue, void *Ptr, pi_int32 Value,
Count, NumEventsInWaitlist, EventsWaitlist, Event);
}

// Helper function to check if a pointer is a device pointer.
static bool IsDevicePointer(pi_context Context, const void *Ptr) {
ze_device_handle_t ZeDeviceHandle;
ze_memory_allocation_properties_t ZeMemoryAllocationProperties = {};

// Query memory type of the pointer
ZE_CALL(zeMemGetAllocProperties,
(Context->ZeContext, Ptr, &ZeMemoryAllocationProperties,
&ZeDeviceHandle));

return (ZeMemoryAllocationProperties.type == ZE_MEMORY_TYPE_DEVICE);
}

pi_result piextUSMEnqueueMemcpy(pi_queue Queue, pi_bool Blocking, void *DstPtr,
const void *SrcPtr, size_t Size,
pi_uint32 NumEventsInWaitlist,
Expand All @@ -6141,10 +6154,14 @@ pi_result piextUSMEnqueueMemcpy(pi_queue Queue, pi_bool Blocking, void *DstPtr,

PI_ASSERT(Queue, PI_INVALID_QUEUE);

// Device to Device copies are found to execute slower on copy engine
// (versus compute engine).
bool PreferCopyEngine = !IsDevicePointer(Queue->Context, SrcPtr) ||
!IsDevicePointer(Queue->Context, DstPtr);
return enqueueMemCopyHelper(
// TODO: do we need a new command type for this?
PI_COMMAND_TYPE_MEM_BUFFER_COPY, Queue, DstPtr, Blocking, Size, SrcPtr,
NumEventsInWaitlist, EventsWaitlist, Event);
NumEventsInWaitlist, EventsWaitlist, Event, PreferCopyEngine);
}

/// Hint to migrate memory to the device
Expand Down