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iommu/dma: return error code from iommu_dma_map_sg() 

Return appropriate error codes EINVAL or ENOMEM from
iommup_dma_map_sg(). If lower level code returns ENOMEM, then we
return it, other errors are coalesced into EINVAL.

iommu_dma_map_sg_swiotlb() returns -EIO as its an unknown error
from a call that returns DMA_MAPPING_ERROR.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Logan Gunthorpe 2021-07-29 14:15:22 -06:00 committed by Christoph Hellwig
parent ad8f36e4b6
commit dabb16f672
1 changed files with 15 additions and 7 deletions
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22
drivers/iommu/dma-iommu.c
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@ -972,7 +972,7 @@ static int iommu_dma_map_sg_swiotlb(struct device *dev, struct scatterlist *sg,
out_unmap:
iommu_dma_unmap_sg_swiotlb(dev, sg, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
return 0;
return -EIO;
}
/*
@ -993,11 +993,13 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
dma_addr_t iova;
size_t iova_len = 0;
unsigned long mask = dma_get_seg_boundary(dev);
ssize_t ret;
int i;
if (static_branch_unlikely(&iommu_deferred_attach_enabled) &&
iommu_deferred_attach(dev, domain))
return 0;
if (static_branch_unlikely(&iommu_deferred_attach_enabled)) {
ret = iommu_deferred_attach(dev, domain);
goto out;
}
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
iommu_dma_sync_sg_for_device(dev, sg, nents, dir);
@ -1045,14 +1047,17 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
}
iova = iommu_dma_alloc_iova(domain, iova_len, dma_get_mask(dev), dev);
if (!iova)
if (!iova) {
ret = -ENOMEM;
goto out_restore_sg;
}
/*
* We'll leave any physical concatenation to the IOMMU driver's
* implementation - it knows better than we do.
*/
if (iommu_map_sg_atomic(domain, iova, sg, nents, prot) < iova_len)
ret = iommu_map_sg_atomic(domain, iova, sg, nents, prot);
if (ret < iova_len)
goto out_free_iova;
return __finalise_sg(dev, sg, nents, iova);
@ -1061,7 +1066,10 @@ out_free_iova:
iommu_dma_free_iova(cookie, iova, iova_len, NULL);
out_restore_sg:
__invalidate_sg(sg, nents);
return 0;
out:
if (ret != -ENOMEM)
return -EINVAL;
return ret;
}
static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,