libhsakmt: Add alignment for memory allocations

New API to support optional alignment parameter for memory allocations.
The alignment should be larger than or equal to page size and a power
of 2.

Change-Id: Ic3fec43b3c4281f74dd33a57ab4143dcf76e1186
Signed-off-by: Chris Freehill <cfreehil@amd.com>

libhsakmt/include/hsakmt/hsakmt.h

@@ -406,6 +406,21 @@ hsaKmtAllocMemory(
     void**          MemoryAddress           //IN/OUT (page-aligned)
     );
 
+/**
+  Allocates a memory buffer with specific alignment that may be accessed by the GPU
+  If Alignment is 0, the smallest possible alignment will be used
+*/
+
+HSAKMT_STATUS
+HSAKMTAPI
+hsaKmtAllocMemoryAlign(
+    HSAuint32       PreferredNode,          //IN
+    HSAuint64       SizeInBytes,            //IN  (multiple of page size)
+    HSAuint64       Alignment,              //IN  (power of 2 and >= page size)
+    HsaMemFlags     MemFlags,               //IN
+    void**          MemoryAddress           //IN/OUT (page-aligned)
+    );
+
 /**
   Frees a memory buffer
 */