iommu/arm-smmu: Remove io-pgtable spinlock

Browse source

With the io-pgtable code now robust against (valid) races, we no longer
need to serialise all operations with a lock. This might make broken
callers who issue concurrent operations on overlapping addresses go even
more wrong than before, but hey, they already had little hope of useful
or deterministic results.

We do however still have to keep a lock around to serialise the ATS1*
translation ops, as parallel iova_to_phys() calls could lead to
unpredictable hardware behaviour otherwise.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

This commit is contained in:

Robin Murphy 2017-06-22 16:53:56 +01:00 • committed by Will Deacon

parent 119ff305b0

commit 523d7423e2

1 changed files with 14 additions and 31 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

45

drivers/iommu/arm-smmu.c

View file