writeback: pay attention to wbc->nr_to_write in write_cache_pages

[safe/jmp/linux-2.6] / crypto / async_tx / async_memcpy.c

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index a973f4e..0ec1fb6 100644 (file)
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -33,99 +33,66 @@
  * async_memcpy - attempt to copy memory with a dma engine.
  * @dest: destination page
  * @src: src page
- * @offset: offset in pages to start transaction
+ * @dest_offset: offset into 'dest' to start transaction
+ * @src_offset: offset into 'src' to start transaction
  * @len: length in bytes
- * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK,
- *     ASYNC_TX_KMAP_SRC, ASYNC_TX_KMAP_DST
- * @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
+ * @submit: submission / completion modifiers
+ *
+ * honored flags: ASYNC_TX_ACK
  */
 struct dma_async_tx_descriptor *
 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
-       unsigned int src_offset, size_t len, enum async_tx_flags flags,
-       struct dma_async_tx_descriptor *depend_tx,
-       dma_async_tx_callback cb_fn, void *cb_param)
+            unsigned int src_offset, size_t len,
+            struct async_submit_ctl *submit)
 {
-       struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMCPY);
+       struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMCPY,
+                                                     &dest, 1, &src, 1, len);
        struct dma_device *device = chan ? chan->device : NULL;
-       int int_en = cb_fn ? 1 : 0;
-       struct dma_async_tx_descriptor *tx = device ?
-               device->device_prep_dma_memcpy(chan, len,
-               int_en) : NULL;
-
-       if (tx) { /* run the memcpy asynchronously */
-               dma_addr_t addr;
-               enum dma_data_direction dir;
+       struct dma_async_tx_descriptor *tx = NULL;
 
-               pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
+       if (device && is_dma_copy_aligned(device, src_offset, dest_offset, len)) {
+               dma_addr_t dma_dest, dma_src;
+               unsigned long dma_prep_flags = 0;
 
-               dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                       DMA_NONE : DMA_FROM_DEVICE;
+               if (submit->cb_fn)
+                       dma_prep_flags |= DMA_PREP_INTERRUPT;
+               if (submit->flags & ASYNC_TX_FENCE)
+                       dma_prep_flags |= DMA_PREP_FENCE;
+               dma_dest = dma_map_page(device->dev, dest, dest_offset, len,
+                                       DMA_FROM_DEVICE);
 
-               addr = dma_map_page(device->dev, dest, dest_offset, len, dir);
-               tx->tx_set_dest(addr, tx, 0);
+               dma_src = dma_map_page(device->dev, src, src_offset, len,
+                                      DMA_TO_DEVICE);
 
-               dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
-                       DMA_NONE : DMA_TO_DEVICE;
-
-               addr = dma_map_page(device->dev, src, src_offset, len, dir);
-               tx->tx_set_src(addr, tx, 0);
+               tx = device->device_prep_dma_memcpy(chan, dma_dest, dma_src,
+                                                   len, dma_prep_flags);
+       }
 
-               async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
-       } else { /* run the memcpy synchronously */
+       if (tx) {
+               pr_debug("%s: (async) len: %zu\n", __func__, len);
+               async_tx_submit(chan, tx, submit);
+       } else {
                void *dest_buf, *src_buf;
-               pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len);
+               pr_debug("%s: (sync) len: %zu\n", __func__, len);
 
                /* wait for any prerequisite operations */
-               if (depend_tx) {
-                       /* if ack is already set then we cannot be sure
-                        * we are referring to the correct operation
-                        */
-                       BUG_ON(depend_tx->ack);
-                       if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
-                               panic("%s: DMA_ERROR waiting for depend_tx\n",
-                                       __FUNCTION__);
-               }
+               async_tx_quiesce(&submit->depend_tx);
 
-               if (flags & ASYNC_TX_KMAP_DST)
-                       dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset;
-               else
-                       dest_buf = page_address(dest) + dest_offset;
-
-               if (flags & ASYNC_TX_KMAP_SRC)
-                       src_buf = kmap_atomic(src, KM_USER0) + src_offset;
-               else
-                       src_buf = page_address(src) + src_offset;
+               dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset;
+               src_buf = kmap_atomic(src, KM_USER1) + src_offset;
 
                memcpy(dest_buf, src_buf, len);
 
-               if (flags & ASYNC_TX_KMAP_DST)
-                       kunmap_atomic(dest_buf, KM_USER0);
-
-               if (flags & ASYNC_TX_KMAP_SRC)
-                       kunmap_atomic(src_buf, KM_USER0);
+               kunmap_atomic(dest_buf, KM_USER0);
+               kunmap_atomic(src_buf, KM_USER1);
 
-               async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+               async_tx_sync_epilog(submit);
        }
 
        return tx;
 }
 EXPORT_SYMBOL_GPL(async_memcpy);
 
-static int __init async_memcpy_init(void)
-{
-       return 0;
-}
-
-static void __exit async_memcpy_exit(void)
-{
-       do { } while (0);
-}
-
-module_init(async_memcpy_init);
-module_exit(async_memcpy_exit);
-
 MODULE_AUTHOR("Intel Corporation");
 MODULE_DESCRIPTION("asynchronous memcpy api");
 MODULE_LICENSE("GPL");