Commit 7c2645a2 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Christoph Hellwig
Browse files

dma-mapping: allow EREMOTEIO return code for P2PDMA transfers 



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: default avatarLogan Gunthorpe <logang@deltatee.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 5e180ff3

kernel/dma/mapping.c

+4 −1
Original line number Diff line number Diff line
@@ -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)