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author | Martin Oliveira <martin.oliveira@eideticom.com> | 2021-07-29 23:15:28 +0300 |
---|---|---|
committer | Christoph Hellwig <hch@lst.de> | 2021-08-09 18:13:05 +0300 |
commit | c4e0e892ab0579d4de3ca6d260d537fc16b39790 (patch) | |
tree | 69ef7391f43f041cdfa079e10851a43a707a02b5 /arch/powerpc | |
parent | af82fe85665d49bdb72dba66cd57e3bf95b71895 (diff) | |
download | linux-c4e0e892ab0579d4de3ca6d260d537fc16b39790.tar.xz |
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/kernel/iommu.c | 4 | ||||
-rw-r--r-- | arch/powerpc/platforms/ps3/system-bus.c | 2 | ||||
-rw-r--r-- | arch/powerpc/platforms/pseries/vio.c | 5 |
3 files changed, 6 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 2af89a5e379f..a8ec4fe42817 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -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; } diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c index 1a5665875165..c54eb46f0cfb 100644 --- a/arch/powerpc/platforms/ps3/system-bus.c +++ b/arch/powerpc/platforms/ps3/system-bus.c @@ -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, diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c index e00f3725ec96..e31e59c54f30 100644 --- a/arch/powerpc/platforms/pseries/vio.c +++ b/arch/powerpc/platforms/pseries/vio.c @@ -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, |