From: Logan Gunthorpe Date: Fri, 8 Jul 2022 16:50:55 +0000 (-0600) Subject: dma-mapping: allow EREMOTEIO return code for P2PDMA transfers X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7c2645a2a30a45d3dc4c98b315a51be44ec69a67;p=linux.git 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: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Christoph Hellwig Signed-off-by: Christoph Hellwig --- diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 1bfe11b1edb66..746d46825d08f 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, 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)