diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index 7b26a04c..6b2ded83 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -1185,6 +1185,34 @@ int amdgpu_bo_va_op(amdgpu_bo_handle bo,
 		    uint64_t flags,
 		    uint32_t ops);
 
+/**
+ *  VA mapping/unmapping for a buffer object or PRT region.
+ *
+ * This is not a simple drop-in extension for amdgpu_bo_va_op; instead, all
+ * parameters are treated "raw", i.e. size is not automatically aligned, and
+ * all flags must be specified explicitly.
+ *
+ * \param  dev		- \c [in] device handle
+ * \param  bo		- \c [in] BO handle (may be NULL)
+ * \param  offset	- \c [in] Start offset to map
+ * \param  size		- \c [in] Size to map
+ * \param  addr		- \c [in] Start virtual address.
+ * \param  flags	- \c [in] Supported flags for mapping/unmapping
+ * \param  ops		- \c [in] AMDGPU_VA_OP_MAP or AMDGPU_VA_OP_UNMAP
+ *
+ * \return   0 on success\n
+ *          <0 - Negative POSIX Error code
+ *
+*/
+
+int amdgpu_bo_va_op_raw(amdgpu_device_handle dev,
+			amdgpu_bo_handle bo,
+			uint64_t offset,
+			uint64_t size,
+			uint64_t addr,
+			uint64_t flags,
+			uint32_t ops);
+
 /**
  *  create semaphore
  *
diff --git a/amdgpu/amdgpu_bo.c b/amdgpu/amdgpu_bo.c
index d30fd1e7..f725bfd8 100644
--- a/amdgpu/amdgpu_bo.c
+++ b/amdgpu/amdgpu_bo.c
@@ -683,6 +683,23 @@ int amdgpu_bo_va_op(amdgpu_bo_handle bo,
 		     uint32_t ops)
 {
 	amdgpu_device_handle dev = bo->dev;
+
+	size = ALIGN(size, getpagesize());
+
+	return amdgpu_bo_va_op_raw(dev, bo, offset, size, addr,
+				   AMDGPU_VM_PAGE_READABLE |
+				   AMDGPU_VM_PAGE_WRITEABLE |
+				   AMDGPU_VM_PAGE_EXECUTABLE, ops);
+}
+
+int amdgpu_bo_va_op_raw(amdgpu_device_handle dev,
+			amdgpu_bo_handle bo,
+			uint64_t offset,
+			uint64_t size,
+			uint64_t addr,
+			uint64_t flags,
+			uint32_t ops)
+{
 	struct drm_amdgpu_gem_va va;
 	int r;
 
@@ -690,14 +707,12 @@ int amdgpu_bo_va_op(amdgpu_bo_handle bo,
 		return -EINVAL;
 
 	memset(&va, 0, sizeof(va));
-	va.handle = bo->handle;
+	va.handle = bo ? bo->handle : 0;
 	va.operation = ops;
-	va.flags = AMDGPU_VM_PAGE_READABLE |
-		   AMDGPU_VM_PAGE_WRITEABLE |
-		   AMDGPU_VM_PAGE_EXECUTABLE;
+	va.flags = flags;
 	va.va_address = addr;
 	va.offset_in_bo = offset;
-	va.map_size = ALIGN(size, getpagesize());
+	va.map_size = size;
 
 	r = drmCommandWriteRead(dev->fd, DRM_AMDGPU_GEM_VA, &va, sizeof(va));