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| author | Tom Murphy <murphyt7@tcd.ie> | 2019-09-08 09:56:38 -0700 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-10-15 11:31:04 +0200 |
| commit | 781ca2de89bae1b1d2c96df9ef33e9a324415995 (patch) | |
| tree | 04157d331dc84fe18b642feb29addc62942cee06 /drivers/iommu/dma-iommu.c | |
| parent | 37ec8eb851c1876580a963f283fe7496592b9f72 (diff) | |
| download | linux-781ca2de89bae1b1d2c96df9ef33e9a324415995.tar.bz2 | |
iommu: Add gfp parameter to iommu_ops::map
Add a gfp_t parameter to the iommu_ops::map function.
Remove the needless locking in the AMD iommu driver.
The iommu_ops::map function (or the iommu_map function which calls it)
was always supposed to be sleepable (according to Joerg's comment in
this thread: https://lore.kernel.org/patchwork/patch/977520/ ) and so
should probably have had a "might_sleep()" since it was written. However
currently the dma-iommu api can call iommu_map in an atomic context,
which it shouldn't do. This doesn't cause any problems because any iommu
driver which uses the dma-iommu api uses gfp_atomic in it's
iommu_ops::map function. But doing this wastes the memory allocators
atomic pools.
Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/dma-iommu.c')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index f321279baf9e..cc3bf5cf0a90 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -476,7 +476,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, if (!iova) return DMA_MAPPING_ERROR; - if (iommu_map(domain, iova, phys - iova_off, size, prot)) { + if (iommu_map_atomic(domain, iova, phys - iova_off, size, prot)) { iommu_dma_free_iova(cookie, iova, size); return DMA_MAPPING_ERROR; } @@ -611,7 +611,7 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, arch_dma_prep_coherent(sg_page(sg), sg->length); } - if (iommu_map_sg(domain, iova, sgt.sgl, sgt.orig_nents, ioprot) + if (iommu_map_sg_atomic(domain, iova, sgt.sgl, sgt.orig_nents, ioprot) < size) goto out_free_sg; @@ -871,7 +871,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, * We'll leave any physical concatenation to the IOMMU driver's * implementation - it knows better than we do. */ - if (iommu_map_sg(domain, iova, sg, nents, prot) < iova_len) + if (iommu_map_sg_atomic(domain, iova, sg, nents, prot) < iova_len) goto out_free_iova; return __finalise_sg(dev, sg, nents, iova); |