iommu/arm-smmu-v3: Reduce contention during command-queue insertion

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The SMMU command queue is a bottleneck in large systems, thanks to the
spin_lock which serialises accesses from all CPUs to the single queue
supported by the hardware.

Attempt to improve this situation by moving to a new algorithm for
inserting commands into the queue, which is lock-free on the fast-path.

Tested-by: Ganapatrao Kulkarni  <gkulkarni@marvell.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Will Deacon 2019-07-02 17:16:25 +01:00

parent 7c288a5b27

commit 587e6c10a7

1 changed files with 533 additions and 144 deletions

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drivers/iommu/arm-smmu-v3.c

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