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dmaengine: virt-dma: store result on dma descriptor 

This allows each virtual channel to store information about each transfer
that completed, i.e. which transfer succeeded (or which failed) and if
there was any residue data on each (completed) transfer.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Alexandru Ardelean 2019-06-06 13:45:47 +03:00 committed by Vinod Koul
parent a08a9645a3
commit 09d5b702b0
2 changed files with 6 additions and 2 deletions
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4
drivers/dma/virt-dma.c
View File

@ -101,7 +101,7 @@ static void vchan_complete(unsigned long arg)
}
spin_unlock_irq(&vc->lock);
dmaengine_desc_callback_invoke(&cb, NULL);
dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
list_for_each_entry_safe(vd, _vd, &head, node) {
dmaengine_desc_get_callback(&vd->tx, &cb);
@ -109,7 +109,7 @@ static void vchan_complete(unsigned long arg)
list_del(&vd->node);
vchan_vdesc_fini(vd);
dmaengine_desc_callback_invoke(&cb, NULL);
dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
}
}

4
drivers/dma/virt-dma.h
View File

@ -17,6 +17,7 @@
struct virt_dma_desc {
struct dma_async_tx_descriptor tx;
struct dmaengine_result tx_result;
/* protected by vc.lock */
struct list_head node;
};
@ -65,6 +66,9 @@ static inline struct dma_async_tx_descriptor *vchan_tx_prep(struct virt_dma_chan
vd->tx.tx_submit = vchan_tx_submit;
vd->tx.desc_free = vchan_tx_desc_free;
vd->tx_result.result = DMA_TRANS_NOERROR;
vd->tx_result.residue = 0;
spin_lock_irqsave(&vc->lock, flags);
list_add_tail(&vd->node, &vc->desc_allocated);
spin_unlock_irqrestore(&vc->lock, flags);