async_tx: kill ASYNC_TX_ASSUME_COHERENT

Remove the unused ASYNC_TX_ASSUME_COHERENT flag.  Async_tx is
meant to hide the difference between asynchronous hardware and synchronous
software operations, this flag requires clients to understand cache
coherency consequences of the async path.

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

4 files changed, 14 insertions, 33 deletions

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index 047e533fcc5b..e8c8956ef1dd 100644
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -35,7 +35,7 @@
  * @src: src page
  * @offset: offset in pages to start transaction
  * @len: length in bytes
- * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK,
+ * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK,
  * @depend_tx: memcpy depends on the result of this transaction
  * @cb_fn: function to call when the memcpy completes
  * @cb_param: parameter to pass to the callback routine
@@ -55,20 +55,15 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 
         if (tx) { /* run the memcpy asynchronously */
                 dma_addr_t addr;
-                enum dma_data_direction dir;
 
                 pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
 
-                dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                        DMA_NONE : DMA_FROM_DEVICE;
-
-                addr = dma_map_page(device->dev, dest, dest_offset, len, dir);
+                addr = dma_map_page(device->dev, dest, dest_offset, len,
+                                    DMA_FROM_DEVICE);
                 tx->tx_set_dest(addr, tx, 0);
 
-                dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                        DMA_NONE : DMA_TO_DEVICE;
-
-                addr = dma_map_page(device->dev, src, src_offset, len, dir);
+                addr = dma_map_page(device->dev, src, src_offset, len,
+                                    DMA_TO_DEVICE);
                 tx->tx_set_src(addr, tx, 0);
 
                 async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c
index 66ef6351202e..760972803958 100644
--- a/crypto/async_tx/async_memset.c
+++ b/crypto/async_tx/async_memset.c
@@ -35,7 +35,7 @@
  * @val: fill value
  * @offset: offset in pages to start transaction
  * @len: length in bytes
- * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
  * @depend_tx: memset depends on the result of this transaction
  * @cb_fn: function to call when the memcpy completes
  * @cb_param: parameter to pass to the callback routine
@@ -55,13 +55,11 @@ async_memset(struct page *dest, int val, unsigned int offset,
 
         if (tx) { /* run the memset asynchronously */
                 dma_addr_t dma_addr;
-                enum dma_data_direction dir;
 
                 pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
-                dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                        DMA_NONE : DMA_FROM_DEVICE;
 
-                dma_addr = dma_map_page(device->dev, dest, offset, len, dir);
+                dma_addr = dma_map_page(device->dev, dest, offset, len,
+                                        DMA_FROM_DEVICE);
                 tx->tx_set_dest(dma_addr, tx, 0);
 
                 async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 716885a87f07..cb41e6bbbc4d 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -42,23 +42,17 @@ do_async_xor(struct dma_async_tx_descriptor *tx, struct dma_device *device,
         dma_async_tx_callback cb_fn, void *cb_param)
 {
         dma_addr_t dma_addr;
-        enum dma_data_direction dir;
         int i;
 
         pr_debug("%s: len: %zu\n", __FUNCTION__, len);
 
-        dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                DMA_NONE : DMA_FROM_DEVICE;
-
-        dma_addr = dma_map_page(device->dev, dest, offset, len, dir);
+        dma_addr = dma_map_page(device->dev, dest, offset, len,
+                                DMA_FROM_DEVICE);
         tx->tx_set_dest(dma_addr, tx, 0);
 
-        dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                DMA_NONE : DMA_TO_DEVICE;
-
         for (i = 0; i < src_cnt; i++) {
                 dma_addr = dma_map_page(device->dev, src_list[i],
-                        offset, len, dir);
+                        offset, len, DMA_TO_DEVICE);
                 tx->tx_set_src(dma_addr, tx, i);
         }
 
@@ -106,7 +100,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
  * @src_cnt: number of source pages
  * @len: length in bytes
  * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST,
- *      ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ *      ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
  * @depend_tx: xor depends on the result of this transaction.
  * @cb_fn: function to call when the xor completes
  * @cb_param: parameter to pass to the callback routine
@@ -246,7 +240,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len)
  * @src_cnt: number of source pages
  * @len: length in bytes
  * @result: 0 if sum == 0 else non-zero
- * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
  * @depend_tx: xor depends on the result of this transaction.
  * @cb_fn: function to call when the xor completes
  * @cb_param: parameter to pass to the callback routine
@@ -270,16 +264,12 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
 
         if (tx) {
                 dma_addr_t dma_addr;
-                enum dma_data_direction dir;
 
                 pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
 
-                dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                        DMA_NONE : DMA_TO_DEVICE;
-
                 for (i = 0; i < src_cnt; i++) {
                         dma_addr = dma_map_page(device->dev, src_list[i],
-                                offset, len, dir);
+                                offset, len, DMA_TO_DEVICE);
                         tx->tx_set_src(dma_addr, tx, i);
                 }
 
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index bdca3f1b3213..3d59d371dd32 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -47,7 +47,6 @@ struct dma_chan_ref {
  * address is an implied source, whereas the asynchronous case it must be listed
  * as a source.  The destination address must be the first address in the source
  * array.
- * @ASYNC_TX_ASSUME_COHERENT: skip cache maintenance operations
  * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
  * dependency chain
  * @ASYNC_TX_DEP_ACK: ack the dependency descriptor.  Useful for chaining.
@@ -55,7 +54,6 @@ struct dma_chan_ref {
 enum async_tx_flags {
         ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
         ASYNC_TX_XOR_DROP_DST    = (1 << 1),
-        ASYNC_TX_ASSUME_COHERENT = (1 << 2),
         ASYNC_TX_ACK             = (1 << 3),
         ASYNC_TX_DEP_ACK         = (1 << 4),
 };