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authorDan Williams <dan.j.williams@intel.com>2009-04-09 19:16:18 -0400
committerDan Williams <dan.j.williams@intel.com>2009-06-03 17:07:34 -0400
commit88ba2aa586c874681c072101287e15d40de7e6e2 (patch)
tree69a124fcd0a8a75ef9aae0cc4081bad83c770374 /include/linux/async_tx.h
parent099f53cb50e45ef617a9f1d63ceec799e489418b (diff)
async_tx: kill ASYNC_TX_DEP_ACK flag
In support of inter-channel chaining async_tx utilizes an ack flag to gate whether a dependent operation can be chained to another. While the flag is not set the chain can be considered open for appending. Setting the ack flag closes the chain and flags the descriptor for garbage collection. The ASYNC_TX_DEP_ACK flag essentially means "close the chain after adding this dependency". Since each operation can only have one child the api now implicitly sets the ack flag at dependency submission time. This removes an unnecessary management burden from clients of the api. [ Impact: clean up and enforce one dependency per operation ] Reviewed-by: Andre Noll <maan@systemlinux.org> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/async_tx.h')
-rw-r--r--include/linux/async_tx.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 513150d8c25b..9f14cd540cd2 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -58,13 +58,11 @@ struct dma_chan_ref {
58 * array. 58 * array.
59 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a 59 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
60 * dependency chain 60 * dependency chain
61 * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
62 */ 61 */
63enum async_tx_flags { 62enum async_tx_flags {
64 ASYNC_TX_XOR_ZERO_DST = (1 << 0), 63 ASYNC_TX_XOR_ZERO_DST = (1 << 0),
65 ASYNC_TX_XOR_DROP_DST = (1 << 1), 64 ASYNC_TX_XOR_DROP_DST = (1 << 1),
66 ASYNC_TX_ACK = (1 << 3), 65 ASYNC_TX_ACK = (1 << 2),
67 ASYNC_TX_DEP_ACK = (1 << 4),
68}; 66};
69 67
70#ifdef CONFIG_DMA_ENGINE 68#ifdef CONFIG_DMA_ENGINE