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authorDave Jiang <dave.jiang@intel.com>2012-04-04 16:10:46 -0700
committerDan Williams <dan.j.williams@intel.com>2012-04-05 15:27:12 -0700
commita2bd1140a264b561e38d99e656cd843c2d840e86 (patch)
tree9c9f19dde5c0213a52de0e77c16059062cc6c8a1 /drivers/dma
parentf26df1a1a9452573af7b6cea9a4723593e838568 (diff)
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netdma: adding alignment check for NETDMA ops
This is the fallout from adding memcpy alignment workaround for certain IOATDMA hardware. NetDMA will only use DMA engine that can handle byte align ops. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index a6c6051ec858..0f1ca74fe0bb 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -332,6 +332,20 @@ struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type)
}
EXPORT_SYMBOL(dma_find_channel);
+/*
+ * net_dma_find_channel - find a channel for net_dma
+ * net_dma has alignment requirements
+ */
+struct dma_chan *net_dma_find_channel(void)
+{
+ struct dma_chan *chan = dma_find_channel(DMA_MEMCPY);
+ if (chan && !is_dma_copy_aligned(chan->device, 1, 1, 1))
+ return NULL;
+
+ return chan;
+}
+EXPORT_SYMBOL(net_dma_find_channel);
+
/**
* dma_issue_pending_all - flush all pending operations across all channels
*/