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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/amd_iommu.c | |
| parent | iommu/amd: Remove unnecessary locking from AMD iommu driver (diff) | |
| download | linux-dev-781ca2de89bae1b1d2c96df9ef33e9a324415995.tar.xz linux-dev-781ca2de89bae1b1d2c96df9ef33e9a324415995.zip | |
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/amd_iommu.c')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 97ca4ed4ce0c..1444757f0ff9 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3106,7 +3106,8 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, } static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, - phys_addr_t paddr, size_t page_size, int iommu_prot) + phys_addr_t paddr, size_t page_size, int iommu_prot, + gfp_t gfp) { struct protection_domain *domain = to_pdomain(dom); int prot = 0; |