Commits
Will Deacon committed cdb8a3c3463
iommu/arm-smmu-v3: Avoid locking on invalidation path when not using ATS When ATS is not in use, we can avoid taking the 'devices_lock' for the domain on the invalidation path by simply caching the number of ATS masters currently attached. The fiddly part is handling a concurrent ->attach() of an ATS-enabled master to a domain that is being invalidated, but we can handle this using an 'smp_mb()' to ensure that our check of the count is ordered after completion of our prior TLB invalidation. This also makes our ->attach() and ->detach() flows symmetric wrt ATS interactions. Acked-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>