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authorNicholas Graumann <nick.graumann@gmail.com>2019-10-15 20:18:22 +0530
committerVinod Koul <vkoul@kernel.org>2019-10-20 19:35:27 +0530
commitd8bae21a48dbe132788291257638f323f4ee5c94 (patch)
tree8fbd4ec96c0f5e89a59e1b6c4583e1d167e805ed /drivers/dma
parenta575d0b4e663d818803f75de0cf4bc3c4b35b203 (diff)
downloadlinux-d8bae21a48dbe132788291257638f323f4ee5c94.tar.bz2
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 <nick.graumann@gmail.com> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com> Link: https://lore.kernel.org/r/1571150904-3988-6-git-send-email-radhey.shyam.pandey@xilinx.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/xilinx/xilinx_dma.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index fe265d942ed2..d81f387cfcc7 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);