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powerpc/iommu: return error code from .map_sg() ops 

The .map_sg() op now expects an error code instead of zero on failure.

Propagate the error up if vio_dma_iommu_map_sg() fails.

ppc_iommu_map_sg() may fail either because of iommu_range_alloc() or
because of tbl->it_ops->set(). The former only supports returning an
error with DMA_MAPPING_ERROR and an examination of the latter indicates
that it may return arch-specific errors (for example,
tce_buildmulti_pSeriesLP()). Hence, coalesce all of those errors into
-EIO, per the documentation on dma_map_sgtable().

Signed-off-by: Martin Oliveira <martin.oliveira@eideticom.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Geoff Levand <geoff@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Martin Oliveira 2021-07-29 14:15:28 -06:00 committed by Christoph Hellwig
parent af82fe8566
commit c4e0e892ab
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/iommu.c
View File

@ -473,7 +473,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
BUG_ON(direction == DMA_NONE);
if ((nelems == 0) || !tbl)
return 0;
return -EINVAL;
outs = s = segstart = &sglist[0];
outcount = 1;
@ -599,7 +599,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
if (s == outs)
break;
}
return 0;
return -EIO;
}

2
arch/powerpc/platforms/ps3/system-bus.c
View File

@ -663,7 +663,7 @@ static int ps3_ioc0_map_sg(struct device *_dev, struct scatterlist *sg,
unsigned long attrs)
{
BUG();
return 0;
return -EINVAL;
}
static void ps3_sb_unmap_sg(struct device *_dev, struct scatterlist *sg,

5
arch/powerpc/platforms/pseries/vio.c
View File

@ -560,7 +560,8 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
for_each_sg(sglist, sgl, nelems, count)
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
if (vio_cmo_alloc(viodev, alloc_size))
ret = vio_cmo_alloc(viodev, alloc_size);
if (ret)
goto out_fail;
ret = ppc_iommu_map_sg(dev, tbl, sglist, nelems, dma_get_mask(dev),
direction, attrs);
@ -577,7 +578,7 @@ out_deallocate:
vio_cmo_dealloc(viodev, alloc_size);
out_fail:
atomic_inc(&viodev->cmo.allocs_failed);
return 0;
return ret;
}
static void vio_dma_iommu_unmap_sg(struct device *dev,