intel-iommu: Speed up processing of the identity_mapping function

commit cb452a4040bb051d92e85d6e7eb60c11734c1781 upstream.

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>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index ca1346e3eedfd58fd7377d7de27fc1afca4d8c62..fc30b0f9ce654675d5f1413c01a1b79701dbd77c 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2109,10 +2109,10 @@ 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;
 }