This patch adds the support to get the iommu device for a mediated device. The assumption is that each mediated device is a minimal assignable set of a physical PCI device. Hence, we should use the iommu device of the parent PCI device to manage the translation.
Cc: Ashok Raj <[email protected]> Cc: Jacob Pan <[email protected]> Cc: Kevin Tian <[email protected]> Cc: Liu Yi L <[email protected]> Signed-off-by: Sanjay Kumar <[email protected]> Signed-off-by: Lu Baolu <[email protected]> --- drivers/iommu/intel-iommu.c | 6 ++++++ drivers/iommu/intel-pasid.h | 16 ++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 7d198ea..fc3ac1c 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -767,6 +767,12 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf if (iommu_dummy(dev)) return NULL; + if (dev_is_mdev(dev)) { + dev = dev_mdev_parent(dev); + if (WARN_ON(!dev_is_pci(dev))) + return NULL; + } + if (dev_is_pci(dev)) { struct pci_dev *pf_pdev; diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h index 518df72..46cde66 100644 --- a/drivers/iommu/intel-pasid.h +++ b/drivers/iommu/intel-pasid.h @@ -35,6 +35,22 @@ struct pasid_table { struct list_head dev; /* device list */ }; +static inline bool dev_is_mdev(struct device *dev) +{ + if (!dev) + return false; + + return !strcmp(dev->bus->name, "mdev"); +} + +static inline struct device *dev_mdev_parent(struct device *dev) +{ + if (WARN_ON(!dev_is_mdev(dev))) + return NULL; + + return dev->parent; +} + extern u32 intel_pasid_max_id; int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp); void intel_pasid_free_id(int pasid); -- 2.7.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
