lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

dmaengine: ack to flags: make use of the unused bits in the 'ack' field

Browse Source 
'ack' is currently a simple integer that flags whether or not a client is done
touching fields in the given descriptor.  It is effectively just a single bit
of information.  Converting this to a flags parameter allows the other bits to
be put to use to control completion actions, like dma-unmap, and capture
results, like xor-zero-sum == 0.

Changes are one of:
1/ convert all open-coded ->ack manipulations to use async_tx_ack
   and async_tx_test_ack.
2/ set the ack bit at prep time where possible
3/ make drivers store the flags at prep time
4/ add flags to the device_prep_dma_interrupt prototype

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2008-04-17 20:17:26 -07:00
parent c4fe15541d
commit 636bdeaa12
8 changed files with 69 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
crypto/async_tx/async_memcpy.c
View File

@ -77,7 +77,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
/* if ack is already set then we cannot be sure
* we are referring to the correct operation
*/
BUG_ON(depend_tx->ack);
BUG_ON(async_tx_test_ack(depend_tx));
if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
panic("%s: DMA_ERROR waiting for depend_tx\n",
__func__);

9
crypto/async_tx/async_tx.c
View File

@ -446,7 +446,7 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx,
* otherwise poll for completion
*/
if (dma_has_cap(DMA_INTERRUPT, device->cap_mask))
intr_tx = device->device_prep_dma_interrupt(chan);
intr_tx = device->device_prep_dma_interrupt(chan, 0);
else
intr_tx = NULL;
@ -515,7 +515,8 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
* 2/ dependencies are 1:1 i.e. two transactions can
* not depend on the same parent
*/
BUG_ON(depend_tx->ack || depend_tx->next || tx->parent);
BUG_ON(async_tx_test_ack(depend_tx) || depend_tx->next ||
tx->parent);
/* the lock prevents async_tx_run_dependencies from missing
* the setting of ->next when ->parent != NULL
@ -594,7 +595,7 @@ async_trigger_callback(enum async_tx_flags flags,
if (device && !dma_has_cap(DMA_INTERRUPT, device->cap_mask))
device = NULL;
tx = device ? device->device_prep_dma_interrupt(chan) : NULL;
tx = device ? device->device_prep_dma_interrupt(chan, 0) : NULL;
} else
tx = NULL;
@ -610,7 +611,7 @@ async_trigger_callback(enum async_tx_flags flags,
/* if ack is already set then we cannot be sure
* we are referring to the correct operation
*/
BUG_ON(depend_tx->ack);
BUG_ON(async_tx_test_ack(depend_tx));
if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
panic("%s: DMA_ERROR waiting for depend_tx\n",
__func__);

2
crypto/async_tx/async_xor.c
View File

@ -191,7 +191,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset,
/* if ack is already set then we cannot be sure
* we are referring to the correct operation
*/
BUG_ON(depend_tx->ack);
BUG_ON(async_tx_test_ack(depend_tx));
if (dma_wait_for_async_tx(depend_tx) ==
DMA_ERROR)
panic("%s: DMA_ERROR waiting for "