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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Han Xu Using dma_pool to manage dma descriptor memory. Signed-off-by: Han Xu Signed-off-by: Frank Li --- drivers/dma/mxs-dma.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index cfb9962417ef6..a60bf7a22492d 100644 --- a/drivers/dma/mxs-dma.c +++ b/drivers/dma/mxs-dma.c @@ -24,6 +24,7 @@ #include #include #include +#include #include @@ -104,6 +105,7 @@ struct mxs_dma_ccw { #define CCW_BLOCK_SIZE (4 * PAGE_SIZE) #define NUM_CCW (int)(CCW_BLOCK_SIZE / sizeof(struct mxs_dma_ccw)) +#define CCW_BLOCK_ALGIN 32 struct mxs_dma_chan { struct mxs_dma_engine *mxs_dma; @@ -117,6 +119,7 @@ struct mxs_dma_chan { enum dma_status status; unsigned int flags; bool reset; + struct dma_pool *ccw_pool; #define MXS_DMA_SG_LOOP (1 << 0) #define MXS_DMA_USE_SEMAPHORE (1 << 1) }; @@ -398,9 +401,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; int ret; - mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev, - CCW_BLOCK_SIZE, - &mxs_chan->ccw_phys, GFP_KERNEL); + mxs_chan->ccw = dma_pool_zalloc(mxs_chan->ccw_pool, GFP_ATOMIC, &mxs_chan->ccw_phys); + if (!mxs_chan->ccw) { ret = -ENOMEM; goto err_alloc; @@ -428,8 +430,7 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) err_clk: free_irq(mxs_chan->chan_irq, mxs_dma); err_irq: - dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, - mxs_chan->ccw, mxs_chan->ccw_phys); + dma_pool_free(mxs_chan->ccw_pool, mxs_chan->ccw, mxs_chan->ccw_phys); err_alloc: return ret; } @@ -443,8 +444,7 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan) free_irq(mxs_chan->chan_irq, mxs_dma); - dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, - mxs_chan->ccw, mxs_chan->ccw_phys); + dma_pool_free(mxs_chan->ccw_pool, mxs_chan->ccw, mxs_chan->ccw_phys); clk_disable_unprepare(mxs_dma->clk); } @@ -745,6 +745,7 @@ static int mxs_dma_probe(struct platform_device *pdev) struct device_node *np = pdev->dev.of_node; const struct mxs_dma_type *dma_type; struct mxs_dma_engine *mxs_dma; + struct dma_pool *ccw_pool; int ret, i; mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL); @@ -797,6 +798,15 @@ static int mxs_dma_probe(struct platform_device *pdev) mxs_dma->pdev = pdev; mxs_dma->dma_device.dev = &pdev->dev; + ccw_pool = dma_pool_create("ccw_pool", mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, + CCW_BLOCK_ALGIN, 0); + + for (i = 0; i < MXS_DMA_CHANNELS; i++) { + struct mxs_dma_chan *mxs_chan = &mxs_dma->mxs_chans[i]; + + mxs_chan->ccw_pool = ccw_pool; + } + /* mxs_dma gets 65535 bytes maximum sg size */ dma_set_max_seg_size(mxs_dma->dma_device.dev, MAX_XFER_BYTES); -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel