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@xxxxxxxxxxxx> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> --- kernel/dma/mapping.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 9478eccd1c8e..c056a1468189 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 +255,8 @@ 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) -- 2.30.2
