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dmaengine: virt-dma: vchan_find_desc()

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Add a function to find a descriptor within the depths of the
virtualized DMA channel support.  Needed for tx_status functionality.

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-05-10 23:39:27 +01:00
parent 50437bff7f
commit fe045874aa
2 changed files with 14 additions and 1 deletions
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13
drivers/dma/virt-dma.c
View File

@ -39,6 +39,19 @@ dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx)
}
EXPORT_SYMBOL_GPL(vchan_tx_submit);
struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc,
dma_cookie_t cookie)
{
struct virt_dma_desc *vd;
list_for_each_entry(vd, &vc->desc_issued, node)
if (vd->tx.cookie == cookie)
return vd;
return NULL;
}
EXPORT_SYMBOL_GPL(vchan_find_desc);
/*
* This tasklet handles the completion of a DMA descriptor by
* calling its callback and freeing it.

2
drivers/dma/virt-dma.h
View File

@ -40,8 +40,8 @@ static inline struct virt_dma_chan *to_virt_chan(struct dma_chan *chan)
}
void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head);
void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev);
struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *, dma_cookie_t);
/**
* vchan_tx_prep - prepare a descriptor