intel-iommu: Speed up processing of the identity_mapping function
Mike Travis [Sat, 28 May 2011 18:15:03 +0000 (13:15 -0500)]
When there are a large count of PCI devices, and the pass through
option for iommu is set, much time is spent in the identity_mapping
function hunting though the iommu domains to check if a specific
device is "identity mapped".

Speed up the function by checking the cached info to see if
it's mapped to the static identity domain.

Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Mike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/pci/intel-iommu.c

index dcf051d..98be0b5 100644 (file)
@@ -2235,10 +2235,10 @@ static int identity_mapping(struct pci_dev *pdev)
        if (likely(!iommu_identity_mapping))
                return 0;
 
+       info = pdev->dev.archdata.iommu;
+       if (info && info != DUMMY_DEVICE_DOMAIN_INFO)
+               return (info->domain == si_domain);
 
-       list_for_each_entry(info, &si_domain->devices, link)
-               if (info->dev == pdev)
-                       return 1;
        return 0;
 }