From d8bae21a48dbe132788291257638f323f4ee5c94 Mon Sep 17 00:00:00 2001 From: Nicholas Graumann Date: Tue, 15 Oct 2019 20:18:22 +0530 Subject: [PATCH] dmaengine: xilinx_dma: Add callback_result support Take advantage of dmaengine_desc_get_callback_invoke which allows either a callback or callback_result to be specified. This can be useful when using the AXI DMA transfer unknown quantities of data where the residue contained in the result can be used to calculate the number of bytes transferred. Signed-off-by: Nicholas Graumann Signed-off-by: Radhey Shyam Pandey Link: https://lore.kernel.org/r/1571150904-3988-6-git-send-email-radhey.shyam.pandey@xilinx.com Signed-off-by: Vinod Koul --- drivers/dma/xilinx/xilinx_dma.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index fe265d9..d81f387 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c @@ -300,12 +300,16 @@ struct xilinx_cdma_tx_segment { * @segments: TX segments list * @node: Node in the channel descriptors list * @cyclic: Check for cyclic transfers. + * @err: Whether the descriptor has an error. + * @residue: Residue of the completed descriptor */ struct xilinx_dma_tx_descriptor { struct dma_async_tx_descriptor async_tx; struct list_head segments; struct list_head node; bool cyclic; + bool err; + u32 residue; }; /** @@ -856,6 +860,8 @@ static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan) spin_lock_irqsave(&chan->lock, flags); list_for_each_entry_safe(desc, next, &chan->done_list, node) { + struct dmaengine_result result; + if (desc->cyclic) { xilinx_dma_chan_handle_cyclic(chan, desc, &flags); break; @@ -864,9 +870,20 @@ static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan) /* Remove from the list of running transactions */ list_del(&desc->node); + if (unlikely(desc->err)) { + if (chan->direction == DMA_DEV_TO_MEM) + result.result = DMA_TRANS_READ_FAILED; + else + result.result = DMA_TRANS_WRITE_FAILED; + } else { + result.result = DMA_TRANS_NOERROR; + } + + result.residue = desc->residue; + /* Run the link descriptor callback function */ spin_unlock_irqrestore(&chan->lock, flags); - dmaengine_desc_get_callback_invoke(&desc->async_tx, NULL); + dmaengine_desc_get_callback_invoke(&desc->async_tx, &result); spin_lock_irqsave(&chan->lock, flags); /* Run any dependencies, then free the descriptor */ @@ -1421,6 +1438,13 @@ static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan) return; list_for_each_entry_safe(desc, next, &chan->active_list, node) { + if (chan->has_sg && chan->xdev->dma_config->dmatype != + XDMA_TYPE_VDMA) + desc->residue = xilinx_dma_get_residue(chan, desc); + else + desc->residue = 0; + desc->err = chan->err; + list_del(&desc->node); if (!desc->cyclic) dma_cookie_complete(&desc->async_tx); -- 2.7.4