iommu/vt-d: Clean up pasid_enabled() and ecs_enabled() dependencies

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When booted with intel_iommu=ecs_off we were still allocating the PASID
tables even though we couldn't actually use them. We really want to make
the pasid_enabled() macro depend on ecs_enabled().

Which is unfortunate, because currently they're the other way round to
cope with the Broadwell/Skylake problems with ECS.

Instead of having ecs_enabled() depend on pasid_enabled(), which was never
something that made me happy anyway, make it depend in the normal case
on the "broken PASID" bit 28 *not* being set.

Then pasid_enabled() can depend on ecs_enabled() as it should. And we also
don't need to mess with it if we ever see an implementation that has some
features requiring ECS (like PRI) but which *doesn't* have PASID support.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

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This commit is contained in:

David Woodhouse 2015-10-24 21:33:01 +02:00

parent 5a10ba27d9

commit d42fde7084

1 changed files with 23 additions and 7 deletions

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drivers/iommu/intel-iommu.c

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