P4 to Git Change 1201490 by xcui@merged_opencl_jxcwin on 2015/10/20 10:47:18

SWDEV-41018 -  if system is equal to or less than 2GB memory, disable CPU and APU for OpenCL, and force the device to be 1.2 if it is a discrete GPU.

	precheckin:
	http://ocltc.amd.com:8111/viewModification.html?modId=60516&personal=true&buildTypeId=&tab=vcsModificationBuilds&show_all_builds=true
	code review:
	http://ocltc.amd.com/reviews/r/8738/

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/cpu/cpudevice.cpp#277 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpudevice.cpp#531 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpusettings.cpp#331 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpusettings.hpp#95 edit

rocclr/runtime/device/gpu/gpusettings.cpp

@@ -146,6 +146,7 @@ bool
 Settings::create(
     const CALdeviceattribs& calAttr
   , bool reportAsOCL12Device
+  , bool smallMemSystem
 )
 {
     CALuint target = calAttr.target;
@@ -228,6 +229,14 @@ Settings::create(
                 oclVersion_ = !reportAsOCL12Device && calAttr.isOpenCL200Device ?
                     XCONCAT(OpenCL, XCONCAT(OPENCL_MAJOR, OPENCL_MINOR)) : OpenCL12;
             }
+            if (smallMemSystem) {         //force the dGPU to be 1.2 device for small memory system.
+                if (apuSystem_) {
+                    return false;
+                }
+                else {
+                    oclVersion_ = OpenCL12;
+                }
+            }
             if (GPU_FORCE_OCL20_32BIT) {
                 force32BitOcl20_ = true;
                 oclVersion_ = !reportAsOCL12Device && calAttr.isOpenCL200Device ?