> From: Lu Baolu <baolu...@linux.intel.com> > Sent: Tuesday, March 29, 2022 1:38 PM > > Use this field to save the pasid/ssid bits that a device is able to > support with its IOMMU hardware. It is a generic attribute of a device > and lifting it into the per-device dev_iommu struct makes it possible > to allocate a PASID for device without calls into the IOMMU drivers. > Any iommu driver which suports PASID related features should set this > field before features are enabled on the devices.
Miss a clarification for non-PCI SVA as discussed here: https://lore.kernel.org/all/85d61ad6-0cf0-ac65-3312-32d0cdeb1...@linux.intel.com/ > > Signed-off-by: Lu Baolu <baolu...@linux.intel.com> > --- > include/linux/iommu.h | 1 + > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 ++ > drivers/iommu/intel/iommu.c | 5 ++++- > 3 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 6ef2df258673..36f43af0af53 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -368,6 +368,7 @@ struct dev_iommu { > struct iommu_fwspec *fwspec; > struct iommu_device *iommu_dev; > void *priv; > + unsigned int pasid_bits; > }; > > int iommu_device_register(struct iommu_device *iommu, > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 627a3ed5ee8f..afc63fce6107 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -2681,6 +2681,8 @@ static struct iommu_device > *arm_smmu_probe_device(struct device *dev) > smmu->features & ARM_SMMU_FEAT_STALL_FORCE) > master->stall_enabled = true; > > + dev->iommu->pasid_bits = master->ssid_bits; > + > return &smmu->iommu; > > err_free_master: > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > index 6f7485c44a4b..c1b91bce1530 100644 > --- a/drivers/iommu/intel/iommu.c > +++ b/drivers/iommu/intel/iommu.c > @@ -4587,8 +4587,11 @@ static struct iommu_device > *intel_iommu_probe_device(struct device *dev) > if (pasid_supported(iommu)) { > int features = pci_pasid_features(pdev); > > - if (features >= 0) > + if (features >= 0) { > info->pasid_supported = features | 1; > + dev->iommu->pasid_bits = > + fls(pci_max_pasids(pdev)) - 1; > + } > } > > if (info->ats_supported && ecap_prs(iommu->ecap) > && > -- > 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
