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async_tx: fix multiple dependency submission

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Shrink struct dma_async_tx_descriptor and introduce
async_tx_channel_switch to properly inject a channel switch interrupt in
the descriptor stream.  This simplifies the locking model as drivers no
longer need to handle dma_async_tx_descriptor.lock.

Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-04-17 20:17:25 -07:00
parent 1c62979ed2
commit 19242d7233
4 changed files with 171 additions and 48 deletions
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9
include/linux/dmaengine.h
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@ -221,11 +221,9 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param);
* @callback: routine to call after this operation is complete
* @callback_param: general parameter to pass to the callback routine
* ---async_tx api specific fields---
* @depend_list: at completion this list of transactions are submitted
* @depend_node: allow this transaction to be executed after another
* transaction has completed, possibly on another channel
* @next: at completion submit this descriptor
* @parent: pointer to the next level up in the dependency chain
* @lock: protect the dependency list
* @lock: protect the parent and next pointers
*/
struct dma_async_tx_descriptor {
dma_cookie_t cookie;
@ -236,8 +234,7 @@ struct dma_async_tx_descriptor {
dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
dma_async_tx_callback callback;
void *callback_param;
struct list_head depend_list;
struct list_head depend_node;
struct dma_async_tx_descriptor *next;
struct dma_async_tx_descriptor *parent;
spinlock_t lock;
};