P4 to Git Change 1594574 by vsytchen@vsytchen-win10 on 2018/08/16 13:43:33

SWDEV-159881 - [OCL][ROCm] Add SVM coarse-grain buffer support with device memory (Part 2)

	1. Implement clEnqueueSvmMap/Unmap using a staging buffer
	2. Enable device memory coarse grain SVM for OCL only with single device contexts.

	ReviewBoardURL = http://ocltc.amd.com/reviews/r/15616/diff/

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/rocm/rocdevice.cpp#94 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/rocm/rocdevice.hpp#30 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/rocm/rocmemory.cpp#38 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/rocm/rocvirtual.cpp#63 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/rocm/rocvirtual.hpp#19 edit
... //depot/stg/opencl/drivers/opencl/runtime/utils/flags.hpp#296 edit

rocclr/runtime/device/rocm/rocdevice.cpp

@@ -1454,7 +1454,9 @@ device::Memory* Device::createMemory(amd::Memory& owner) const {
   }
 
   // Prepin sysmem buffer for possible data synchronization between CPU and GPU
-  if (!memory->isHostMemDirectAccess() && (owner.getHostMem() != nullptr)) {
+  if (!memory->isHostMemDirectAccess() &&
+      (owner.getHostMem() != nullptr) &&
+      (owner.getSvmPtr() == nullptr)) {
     memory->pinSystemMemory(owner.getHostMem(), owner.getSize());
   }