Commits
Bjorn Helgaas committed fb0cc3aa552
iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth 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>