iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth

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We check the ATS state (enabled/disabled) and fetch the PCI ATS Invalidate
Queue Depth in performance-sensitive paths.  It's easy to cache these,
which removes dependencies on PCI.

Remember the ATS enabled state.  When enabling, read the queue depth once
and cache it in the device_domain_info struct.  This is similar to what
amd_iommu.c does.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Joerg Roedel <jroedel@suse.de>

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Bjorn Helgaas 2015-07-20 09:10:36 -05:00

parent bc0195aad0

commit fb0cc3aa55

1 changed files with 18 additions and 10 deletions

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drivers/iommu/intel-iommu.c

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