async_tx: allow architecture specific async_tx_find_channel implementations

The source and destination addresses are included to allow channel
selection based on address alignment.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 3d59d371dd32..eb640f0acfac 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -62,9 +62,15 @@ enum async_tx_flags {
 void async_tx_issue_pending_all(void);
 enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
 void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx);
+#ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
+#include <asm/async_tx.h>
+#else
+#define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
+         __async_tx_find_channel(dep, type)
 struct dma_chan *
-async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
+__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
         enum dma_transaction_type tx_type);
+#endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
 #else
 static inline void async_tx_issue_pending_all(void)
 {
@@ -86,7 +92,8 @@ async_tx_run_dependencies(struct dma_async_tx_descriptor *tx,
 
 static inline struct dma_chan *
 async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
-        enum dma_transaction_type tx_type)
+        enum dma_transaction_type tx_type, struct page **dst, int dst_count,
+        struct page **src, int src_count, size_t len)
 {
         return NULL;
 }