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    Subject[PATCH v5 07/24] 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 <logang@deltatee.com>
    Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
    ---
    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
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