Alexandre Bounine 50835e977b rapidio/tsi721_dma: rework scatter-gather list handling ...

Rework Tsi721 RapidIO DMA engine support to allow handling data
scatter/gather lists longer than number of hardware buffer descriptors in
the DMA channel's descriptor list.

The current implementation of Tsi721 DMA transfers requires that number of
entries in a scatter/gather list provided by a caller of
dmaengine_prep_rio_sg() should not exceed number of allocated hardware
buffer descriptors.

This patch removes the limitation by processing long scatter/gather lists
by sections that can be transferred using hardware descriptor ring of
configured size.  It also introduces a module parameter
"dma_desc_per_channel" to allow run-time configuration of Tsi721 hardware
buffer descriptor rings.

Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Andre van Herk <[email protected]>
Cc: Stef van Os <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Dan Williams <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2014-08-08 15:57:24 -07:00

..

rapidio.txt

doc: Fix typo in doucmentations

2013-07-25 12:34:15 +02:00

sysfs.txt

rapidio: rework device hierarchy and introduce mport class of devices

2014-04-07 16:36:07 -07:00

tsi721.txt

rapidio/tsi721_dma: rework scatter-gather list handling

2014-08-08 15:57:24 -07:00