On Tue, Aug 11, 2015 at 10:51:07AM -0500, Bjorn Helgaas wrote: > 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@xxxxxxxxxx> > --- > drivers/iommu/intel-iommu.c | 28 ++++++++++++++++++---------- > 1 file changed, 18 insertions(+), 10 deletions(-) Reviewed-by: Joerg Roedel <jroedel@xxxxxxx> Acked-by: Joerg Roedel <jroedel@xxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
