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dma-mapping: allow EREMOTEIO return code for P2PDMA transfers

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Add EREMOTEIO error return to dma_map_sgtable() which will be used
by .map_sg() implementations that detect P2PDMA pages that the
underlying DMA device cannot access.

Signed-off-by: Logan Gunthorpe <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Logan Gunthorpe authored and Christoph Hellwig committed 2022-07-26 07:27:47 -04:00
1 parent 5e180ff326
commit 7c2645a2a3
1 file changed
+4 -1
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kernel/dma/mapping.c
+4 -1
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@@ -197,7 +197,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
if (ents > 0)
debug_dma_map_sg(dev, sg, nents, ents, dir, attrs);
else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
ents != -EIO))
ents != -EIO && ents != -EREMOTEIO))
return -EIO;
return ents;
@@ -255,6 +255,9 @@ EXPORT_SYMBOL(dma_map_sg_attrs);
* complete the mapping. Should succeed if retried later.
* -EIO Legacy error code with an unknown meaning. eg. this is
* returned if a lower level call returned DMA_MAPPING_ERROR.
* -EREMOTEIO The DMA device cannot access P2PDMA memory specified in
* the sg_table. This will not succeed if retried.
*
*/
int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
enum dma_data_direction dir, unsigned long attrs)