xrp-dsp: expose xrp_device_enable_cache

Enable experimental support for caching shared memory on the DSP.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

xrp-dsp/xrp_dsp.c

@@ -70,6 +70,12 @@ struct xrp_buffer_group {
 };
 
 
+void xrp_device_enable_cache(struct xrp_device *device, int enable)
+{
+	(void)device;
+	manage_cache = enable;
+}
+
 static inline void dcache_region_invalidate(void *p, size_t sz)
 {
 	if (manage_cache)

xrp_api.h

@@ -443,6 +443,19 @@ void xrp_device_unregister_namespace(struct xrp_device *device,
 				     const void *nsid,
 				     enum xrp_status *status);
 
+/*
+ * Enable or disable shared memory cache management.
+ * Note that this call does not change memory caching attributes, it only
+ * enables flushing and invalidating used regions of shared memory in the
+ * XRP code.
+ *
+ * \param device: device for which shared memory cache management state is
+ *                changed
+ * \param enable: whether cache management shall be enabled (non-zero) or
+ *                disabled (0)
+ */
+void xrp_device_enable_cache(struct xrp_device *device, int enable);
+
 /*
  * Helper function that terminates fast simulation
  */