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authorNicolin Chen <nicolinc@nvidia.com>2023-10-23 18:29:58 -0700
committerJason Gunthorpe <jgg@nvidia.com>2023-10-24 12:56:37 -0300
commit2ccabf81ddff81355bf044bdad3c44e9e6ac32d9 (patch)
treed8a4a81488d15704280614ff7826a1090dcc4cc3 /scripts
parent0795b305da8902e7d092f90bf9a1a2c98f34b1db (diff)
downloadlwn-2ccabf81ddff81355bf044bdad3c44e9e6ac32d9.tar.gz
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iommufd: Only enforce cache coherency in iommufd_hw_pagetable_alloc
According to the conversation in the following link: https://lore.kernel.org/linux-iommu/20231020135501.GG3952@nvidia.com/ The enforce_cache_coherency should be set/enforced in the hwpt allocation routine. The iommu driver in its attach_dev() op should decide whether to reject or not a device that doesn't match with the configuration of cache coherency. Drop the enforce_cache_coherency piece in the attach/replace() and move the remaining "num_devices" piece closer to the refcount that is using it. Accordingly drop its function prototype in the header and mark it static. Also add some extra comments to clarify the expected behaviors. Link: https://lore.kernel.org/r/20231024012958.30842-1-nicolinc@nvidia.com Suggested-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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