rpmsg: buffers flush/invalidate

Do buffers flush and invalidate the same as with vrings
and resource table:
- add defines in header file;
- call BUFFER_FLUSH/BUFFER_INVALIDATE where necessary.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>

lib/include/openamp/rpmsg_virtio.h

@@ -14,6 +14,7 @@
 
 #include <metal/io.h>
 #include <metal/mutex.h>
+#include <metal/cache.h>
 #include <openamp/rpmsg.h>
 #include <openamp/virtio.h>
 
@@ -29,6 +30,14 @@ extern "C" {
 /* The feature bitmap for virtio rpmsg */
 #define VIRTIO_RPMSG_F_NS	0 /* RP supports name service notifications */
 
+#ifdef VIRTIO_CACHED_BUFFERS
+#define BUFFER_FLUSH(x, s)		metal_cache_flush(x, s)
+#define BUFFER_INVALIDATE(x, s)		metal_cache_invalidate(x, s)
+#else
+#define BUFFER_FLUSH(x, s)		do { } while (0)
+#define BUFFER_INVALIDATE(x, s)		do { } while (0)
+#endif /* VIRTIO_CACHED_BUFFERS */
+
 /**
  * struct rpmsg_virtio_shm_pool - shared memory pool used for rpmsg buffers
  * @base: base address of the memory pool

lib/rpmsg/rpmsg_virtio.c

@@ -9,7 +9,6 @@
  */
 
 #include <metal/alloc.h>
-#include <metal/cache.h>
 #include <metal/sleep.h>
 #include <metal/utilities.h>
 #include <openamp/rpmsg_virtio.h>
@@ -93,9 +92,7 @@ static void rpmsg_virtio_return_buffer(struct rpmsg_virtio_device *rvdev,
 {
 	unsigned int role = rpmsg_virtio_get_role(rvdev);
 
-#ifdef VIRTIO_CACHED_BUFFERS
-	metal_cache_invalidate(buffer, len);
-#endif
+	BUFFER_INVALIDATE(buffer, len);
 
 #ifndef VIRTIO_DEVICE_ONLY
 	if (role == RPMSG_HOST) {
@@ -135,9 +132,7 @@ static int rpmsg_virtio_enqueue_buffer(struct rpmsg_virtio_device *rvdev,
 {
 	unsigned int role = rpmsg_virtio_get_role(rvdev);
 
-#ifdef VIRTIO_CACHED_BUFFERS
-	metal_cache_flush(buffer, len);
-#endif /* VIRTIO_CACHED_BUFFERS */
+	BUFFER_FLUSH(buffer, len);
 
 #ifndef VIRTIO_DEVICE_ONLY
 	if (role == RPMSG_HOST) {
@@ -245,11 +240,9 @@ static void *rpmsg_virtio_get_rx_buffer(struct rpmsg_virtio_device *rvdev,
 	}
 #endif /*!VIRTIO_DRIVER_ONLY*/
 
-#ifdef VIRTIO_CACHED_BUFFERS
 	/* Invalidate the buffer before returning it */
 	if (data)
-		metal_cache_invalidate(data, *len);
-#endif /* VIRTIO_CACHED_BUFFERS */
+		BUFFER_INVALIDATE(data, *len);
 
 	return data;
 }