Messages in this thread Patch in this message | | | From | Nicolin Chen <> | Subject | [PATCH] iommu/vt-d: Try info->iommu in device_to_iommu() | Date | Thu, 12 May 2022 17:32:33 -0700 |
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Local boot test and VFIO sanity test show that info->iommu can be used in device_to_iommu() as a fast path. So this patch adds it.
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- drivers/iommu/intel/iommu.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 2990f80c5e08..412fca5ab9cd 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -777,6 +777,7 @@ static bool iommu_is_dummy(struct intel_iommu *iommu, struct device *dev) struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) { struct dmar_drhd_unit *drhd = NULL; + struct device_domain_info *info; struct pci_dev *pdev = NULL; struct intel_iommu *iommu; struct device *tmp; @@ -786,6 +787,10 @@ struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) if (!dev) return NULL; + info = dev_iommu_priv_get(dev); + if (info) + return info->iommu; + if (dev_is_pci(dev)) { struct pci_dev *pf_pdev; -- 2.17.1
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