[PATCH v3 05/20] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers

[Logan Gunthorpe]

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 <logang at deltatee.com>
---
 kernel/dma/mapping.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 7ee5284bff58..7315ae31cf1d 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -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);
 	else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
-			      ents != -EIO))
+			      ents != -EIO && ents != -EREMOTEIO))
 		return -EIO;
 
 	return ents;
@@ -248,12 +248,14 @@ EXPORT_SYMBOL(dma_map_sg_attrs);
  * Returns 0 on success or a negative error code on error. The following
  * error codes are supported with the given meaning:
  *
- *   -EINVAL - An invalid argument, unaligned access or other error
- *	       in usage. Will not succeed if retried.
- *   -ENOMEM - Insufficient resources (like memory or IOVA space) to
- *	       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.
+ *   -EINVAL	- An invalid argument, unaligned access or other error
+ *		  in usage. Will not succeed if retried.
+ *   -ENOMEM	- Insufficient resources (like memory or IOVA space) to
+ *		  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)
-- 
2.30.2