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| author | Mike Travis <travis@sgi.com> | 2011-05-28 13:15:03 -0500 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2011-06-01 12:47:36 +0100 |
| commit | cb452a4040bb051d92e85d6e7eb60c11734c1781 (patch) | |
| tree | ef19298ec70274c9c199fa74a4f08e77cc69080b | |
| parent | 8fcc5372fbac085199d84a880503ed67aba3fe49 (diff) | |
| download | linux-stable-cb452a4040bb051d92e85d6e7eb60c11734c1781.tar.gz linux-stable-cb452a4040bb051d92e85d6e7eb60c11734c1781.tar.bz2 linux-stable-cb452a4040bb051d92e85d6e7eb60c11734c1781.zip | |
intel-iommu: Speed up processing of the identity_mapping function
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>
| -rw-r--r-- | drivers/pci/intel-iommu.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index dcf051d53b74..98be0b55ac0b 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -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; } |