Add extended coherence memory flag

Add support for new flag for memory allocation that will provide
system-scope coherent atomics

Change-Id: I426d66223e8d2b570f69b4c0e61145ce9b2290d2

include/hsakmttypes.h

@@ -566,7 +566,8 @@ typedef struct _HsaMemFlags
             unsigned int Uncached:      1; // Caching flag for fine-grained memory on A+A HW platform
             unsigned int NoAddress:     1; // only do vram allocation, return a handle, not allocate virtual address.
             unsigned int OnlyAddress:   1; // only do virtal address allocation without vram allocation.
-            unsigned int Reserved:     12;
+            unsigned int ExtendedCoherent: 1;  // system-scope coherence on atomic instructions
+            unsigned int Reserved:     11;
 
         } ui32;
         HSAuint32 Value;
@@ -1372,6 +1373,7 @@ typedef enum _HSA_SVM_FLAGS {
 	HSA_SVM_FLAG_GPU_EXEC    = 0x00000010, // Allow execution on GPU
 	HSA_SVM_FLAG_GPU_READ_MOSTLY = 0x00000020, // GPUs mostly read, may allow similar optimizations as RO, but writes fault
 	HSA_SVM_FLAG_GPU_ALWAYS_MAPPED = 0x00000040, // Keep GPU memory mapping always valid as if XNACK is disable
+	HSA_SVM_FLAG_EXT_COHERENT = 0x00000080, //  Fine grained coherency between all devices using device-scope atomics
 } HSA_SVM_FLAGS;
 
 typedef enum _HSA_SVM_ATTR_TYPE {

include/linux/kfd_ioctl.h

@@ -1027,6 +1027,7 @@ struct kfd_ioctl_acquire_vm_args {
 #define KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM	(1 << 27)
 #define KFD_IOC_ALLOC_MEM_FLAGS_COHERENT	(1 << 26)
 #define KFD_IOC_ALLOC_MEM_FLAGS_UNCACHED	(1 << 25)
+#define KFD_IOC_ALLOC_MEM_FLAGS_EXT_COHERENT	(1 << 24)
 
 /* Allocate memory for later SVM (shared virtual memory) mapping.
  *
@@ -1375,6 +1376,8 @@ struct kfd_ioctl_cross_memory_copy_args {
 #define KFD_IOCTL_SVM_FLAG_GPU_READ_MOSTLY     0x00000020
 /* Keep GPU memory mapping always valid as if XNACK is disable */
 #define KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED   0x00000040
+/* Fine grained coherency between all devices using device-scope atomics */
+#define KFD_IOCTL_SVM_FLAG_EXT_COHERENT        0x00000080
 
 /**
  * kfd_ioctl_svm_op - SVM ioctl operations