1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h
index 47e099772b8e..1ca5e0e633f4 100644
--- a/drivers/dma/dmaengine.h
+++ b/drivers/dma/dmaengine.h
@@ -45,4 +45,35 @@ static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx)
         tx->cookie = 0;
 }
 
+/**
+ * dma_cookie_status - report cookie status
+ * @chan: dma channel
+ * @cookie: cookie we are interested in
+ * @state: dma_tx_state structure to return last/used cookies
+ *
+ * Report the status of the cookie, filling in the state structure if
+ * non-NULL.  No locking is required.
+ */
+static inline enum dma_status dma_cookie_status(struct dma_chan *chan,
+        dma_cookie_t cookie, struct dma_tx_state *state)
+{
+        dma_cookie_t used, complete;
+
+        used = chan->cookie;
+        complete = chan->completed_cookie;
+        barrier();
+        if (state) {
+                state->last = complete;
+                state->used = used;
+                state->residue = 0;
+        }
+        return dma_async_is_complete(cookie, complete, used);
+}
+
+static inline void dma_set_residue(struct dma_tx_state *state, u32 residue)
+{
+        if (state)
+                state->residue = residue;
+}
+
 #endif