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| author |   Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-07-06 12:19:23 +0200 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2015-08-06 08:30:56 +0530 |
| commit | 50c7cd2bd3786258606c6c7c8356064c08ab2383 (patch) | |
| tree | b5854b21601f6cf912246f6ddd59a30c44836b2c /include/linux/dmaengine.h | |
| parent | dmaengine: Add an enum for the dmaengine alignment constraints (diff) | |
| download | linux-dev-50c7cd2bd3786258606c6c7c8356064c08ab2383.tar.xz linux-dev-50c7cd2bd3786258606c6c7c8356064c08ab2383.zip | |
dmaengine: Add scatter-gathered memset
The current API allows the driver to accelerate memset by using the DMA
controller.
However, it does so over a contiguous memory area, which might proves
inefficient when you have to do it over a non-contiguous yet repititive
pattern, since you have to create a number of descriptors and then submit
each other.
Add a memset operation going over a scatter list to handle such cases in a
single call.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 03ed832adbc2..8ad9a4e839f6 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -66,6 +66,7 @@ enum dma_transaction_type { DMA_XOR_VAL, DMA_PQ_VAL, DMA_MEMSET, + DMA_MEMSET_SG, DMA_INTERRUPT, DMA_SG, DMA_PRIVATE, @@ -630,6 +631,7 @@ enum dmaengine_alignment { * @device_prep_dma_pq: prepares a pq operation * @device_prep_dma_pq_val: prepares a pqzero_sum operation * @device_prep_dma_memset: prepares a memset operation + * @device_prep_dma_memset_sg: prepares a memset operation over a scatter list * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation * @device_prep_dma_cyclic: prepare a cyclic dma operation suitable for audio. @@ -696,6 +698,9 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_memset_sg)( + struct dma_chan *chan, struct scatterlist *sg, + unsigned int nents, int value, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)( struct dma_chan *chan, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_sg)( |