iommu/arm-smmu: use mutex instead of spinlock for locking page tables

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When creating IO mappings, we lazily allocate our page tables using the
standard, non-atomic allocator functions. This presents us with a
problem, since our page tables are protected with a spinlock.

This patch reworks the smmu_domain lock to use a mutex instead of a
spinlock. iova_to_phys is then reworked so that it only reads the page
tables, and can run in a lockless fashion, leaving the mutex to guard
against concurrent mapping threads.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2013-11-07 18:47:50 +00:00

parent dc1ccc4815

commit a44a9791e7

1 changed files with 26 additions and 36 deletions

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drivers/iommu/arm-smmu.c

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