P4 to Git Change 1138096 by skudchad@skudchad_test_win_opencl2 on 2015/04/07 13:46:20

EPR #403782 - IOMMU2/SVM
	- Handle case of only one DMA engine available, for example with SVM.

	ReviewBoardURL = http://ocltc.amd.com/reviews/r/7284/diff/

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpudevice.cpp#506 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpudevice.hpp#142 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpuvirtual.cpp#357 edit

rocclr/runtime/device/gpu/gpuvirtual.cpp

@@ -498,7 +498,11 @@ VirtualGPU::create(
             engineMask = dev().engines().getMask((gslEngineID)(dev().isComputeRingIDForced() ?
                          dev().getforcedComputeEngineID() : (GSL_ENGINEID_COMPUTE0 + idx)));
             if (dev().canDMA()) {
-                if (index() & 0x1) {
+                // If only 1 DMA engine is available then use that one
+                if (dev().engines().numDMAEngines() < 2) {
+                    engineMask |= dev().engines().getMask(GSL_ENGINEID_DRMDMA0);
+                }
+                else if (index() & 0x1) {
                     engineMask |= dev().engines().getMask(GSL_ENGINEID_DRMDMA0);
                 }
                 else {