diff options
| author | Jan Kuliga <jankul@alatek.krakow.pl> | 2023-12-18 12:39:38 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-12-21 21:51:54 +0530 |
| commit | e5bc76b0e1c54906ca744ed1a7872f4f407d5d2e (patch) | |
| tree | 35a98c5f4050c2f7d71a3158b37baa38cfe32810 /drivers/dma | |
| parent | 7a9c7f46bd0abea214d96f00f78622f24c798ad8 (diff) | |
| download | linux-e5bc76b0e1c54906ca744ed1a7872f4f407d5d2e.tar.gz | |
dmaengine: xilinx: xdma: Ease dma_pool alignment requirements
According to the XDMA datasheet (PG195), the address of any descriptor
must be 32 byte aligned. The datasheet also states that a contiguous
block of descriptors must not cross a 4k address boundary. Therefore,
it is possible to ease the pressure put on the dma_pool allocator
just by requiring sufficient alignment and boundary values. Add proper
macro definition and change the values passed into the
dma_pool_create().
Signed-off-by: Jan Kuliga <jankul@alatek.krakow.pl>
Link: https://lore.kernel.org/r/20231218113943.9099-4-jankul@alatek.krakow.pl
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/xilinx/xdma-regs.h | 7 | ||||
| -rw-r--r-- | drivers/dma/xilinx/xdma.c | 5 |
2 files changed, 6 insertions, 6 deletions
diff --git a/drivers/dma/xilinx/xdma-regs.h b/drivers/dma/xilinx/xdma-regs.h index 98117e8a466fa2..98f5f6fb9ff9c7 100644 --- a/drivers/dma/xilinx/xdma-regs.h +++ b/drivers/dma/xilinx/xdma-regs.h @@ -64,9 +64,10 @@ struct xdma_hw_desc { __le64 next_desc; }; -#define XDMA_DESC_SIZE sizeof(struct xdma_hw_desc) -#define XDMA_DESC_BLOCK_SIZE (XDMA_DESC_SIZE * XDMA_DESC_ADJACENT) -#define XDMA_DESC_BLOCK_ALIGN 4096 +#define XDMA_DESC_SIZE sizeof(struct xdma_hw_desc) +#define XDMA_DESC_BLOCK_SIZE (XDMA_DESC_SIZE * XDMA_DESC_ADJACENT) +#define XDMA_DESC_BLOCK_ALIGN 32 +#define XDMA_DESC_BLOCK_BOUNDARY 4096 /* * Channel registers diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c index ddb9e7d0746165..c22701e76b693e 100644 --- a/drivers/dma/xilinx/xdma.c +++ b/drivers/dma/xilinx/xdma.c @@ -741,9 +741,8 @@ static int xdma_alloc_chan_resources(struct dma_chan *chan) return -EINVAL; } - xdma_chan->desc_pool = dma_pool_create(dma_chan_name(chan), - dev, XDMA_DESC_BLOCK_SIZE, - XDMA_DESC_BLOCK_ALIGN, 0); + xdma_chan->desc_pool = dma_pool_create(dma_chan_name(chan), dev, XDMA_DESC_BLOCK_SIZE, + XDMA_DESC_BLOCK_ALIGN, XDMA_DESC_BLOCK_BOUNDARY); if (!xdma_chan->desc_pool) { xdma_err(xdev, "unable to allocate descriptor pool"); return -ENOMEM; |