diff options
| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2014-08-08 14:22:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-08 15:57:24 -0700 |
| commit | 50835e977b69c3278bd5e4264737138346df133f (patch) | |
| tree | da891568dd1e4c7f9dae7e440d1ea2a6726aab93 /drivers/rapidio/devices/tsi721.h | |
| parent | 4aff1ce7add1c432fe5ea3ae0231155f33e5ef38 (diff) | |
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 <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Stef van Os <stef.van.os@prodrive-technologies.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/devices/tsi721.h')
| -rw-r--r-- | drivers/rapidio/devices/tsi721.h | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/rapidio/devices/tsi721.h b/drivers/rapidio/devices/tsi721.h index 0305675270ee..a7b42680a06a 100644 --- a/drivers/rapidio/devices/tsi721.h +++ b/drivers/rapidio/devices/tsi721.h @@ -644,27 +644,26 @@ enum tsi721_smsg_int_flag { #ifdef CONFIG_RAPIDIO_DMA_ENGINE -#define TSI721_BDMA_BD_RING_SZ 128 #define TSI721_BDMA_MAX_BCOUNT (TSI721_DMAD_BCOUNT1 + 1) struct tsi721_tx_desc { struct dma_async_tx_descriptor txd; - struct tsi721_dma_desc *hw_desc; u16 destid; /* low 64-bits of 66-bit RIO address */ u64 rio_addr; /* upper 2-bits of 66-bit RIO address */ u8 rio_addr_u; - u32 bcount; - bool interrupt; + enum dma_rtype rtype; struct list_head desc_node; - struct list_head tx_list; + struct scatterlist *sg; + unsigned int sg_len; + enum dma_status status; }; struct tsi721_bdma_chan { int id; void __iomem *regs; - int bd_num; /* number of buffer descriptors */ + int bd_num; /* number of HW buffer descriptors */ void *bd_base; /* start of DMA descriptors */ dma_addr_t bd_phys; void *sts_base; /* start of DMA BD status FIFO */ @@ -680,7 +679,6 @@ struct tsi721_bdma_chan { struct list_head active_list; struct list_head queue; struct list_head free_list; - dma_cookie_t completed_cookie; struct tasklet_struct tasklet; bool active; }; |