Hi Dan,
On 02.11.2007, 3:36:50 you wrote:
> I am preparing a new patch that replaces ASYNC_TX_DEP_ACK with
> ASYNC_TX_CHAIN_ACK. The plan is to make the entire chain of
> dependencies available up until the last transaction is submitted.
> This allows the entire dependency chain to be walked at
> async_tx_submit time so that we can properly handle these multiple
> dependency cases. I'll send it out when it passes my internal
> tests...
Meanwhile I've implemented my fix to this issue. With this the tests, which
previously failed (mkfs got stuck), now pass successfully for me. Would you
please take a look? Thanks in advance.
diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index bc18cbb..6d77ae6 100644
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -92,7 +92,7 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
/* find the root of the unsubmitted dependency chain */
while (iter->cookie == -EBUSY) {
parent = iter->parent;
- if (parent && parent->cookie == -EBUSY)
+ if (parent)
iter = iter->parent;
else
break;
@@ -120,10 +120,11 @@ async_tx_run_dependencies(struct dma_async_tx_descriptor
*tx)
depend_node) {
chan = dep_tx->chan;
dev = chan->device;
- /* we can't depend on ourselves */
- BUG_ON(chan == tx->chan);
list_del(&dep_tx->depend_node);
- tx->tx_submit(dep_tx);
+ dep_tx->tx_submit(dep_tx);
+
+ /* we no longer have a parent */
+ dep_tx->parent = NULL;
/* we need to poke the engine as client code does not
* know about dependency submission events
@@ -409,25 +410,41 @@ async_tx_submit(struct dma_chan *chan, struct
dma_async_tx_descriptor *tx,
/* set this new tx to run after depend_tx if:
* 1/ a dependency exists (depend_tx is !NULL)
* 2/ the tx can not be submitted to the current channel
+ * 3/ the depend_tx has a parent
*/
- if (depend_tx && depend_tx->chan != chan) {
+ if (depend_tx && (depend_tx->chan != chan || depend_tx->parent)) {
/* if ack is already set then we cannot be sure
* we are referring to the correct operation
*/
BUG_ON(depend_tx->ack);
- tx->parent = depend_tx;
spin_lock_bh(&depend_tx->lock);
+ tx->parent = depend_tx;
list_add_tail(&tx->depend_node, &depend_tx->depend_list);
if (depend_tx->cookie == 0) {
- struct dma_chan *dep_chan = depend_tx->chan;
- struct dma_device *dep_dev = dep_chan->device;
- dep_dev->device_dependency_added(dep_chan);
- }
- spin_unlock_bh(&depend_tx->lock);
+ /* depend_tx has been completed, run our dep
+ * manually
+ */
+ async_tx_run_dependencies(depend_tx);
+ spin_unlock_bh(&depend_tx->lock);
+ } else {
+ /* depend_tx still in fly */
+ spin_unlock_bh(&depend_tx->lock);
- /* schedule an interrupt to trigger the channel switch */
- async_trigger_callback(ASYNC_TX_ACK, depend_tx, NULL, NULL);
+ /* schedule an interrupt to trigger the channel
+ * switch or dependencies submittion
+ */
+ if (!(flags & ASYNC_TX_INT) && (depend_tx->chan != chan
||
+ !depend_tx->callback))
+ async_trigger_callback(ASYNC_TX_ACK |
ASYNC_TX_INT,
+ depend_tx, NULL, NULL);
+
+ /* flush the parent if it's not submitted yet */
+ spin_lock_bh(&depend_tx->lock);
+ depend_tx->chan->device->device_issue_pending(
+ depend_tx->chan);
+ spin_unlock_bh(&depend_tx->lock);
+ }
} else {
tx->parent = NULL;
tx->tx_submit(tx);
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index aea0402..ee09315 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -67,6 +67,7 @@ enum async_tx_flags {
ASYNC_TX_KMAP_SRC = (1 << 5),
ASYNC_TX_KMAP_DST = (1 << 6),
ASYNC_TX_ASYNC_ONLY = (1 << 7),
+ ASYNC_TX_INT = (1 << 8),
};
#ifdef CONFIG_DMA_ENGINE
-
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