diff options
Diffstat (limited to 'drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index 8cd8929bbfdf..93fdadd07431 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -99,6 +99,8 @@ static void arm_smmu_make_nested_domain_ste( int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, struct arm_smmu_nested_domain *nested_domain) { + unsigned int cfg = + FIELD_GET(STRTAB_STE_0_CFG, le64_to_cpu(nested_domain->ste[0])); struct arm_smmu_vmaster *vmaster; unsigned long vsid; int ret; @@ -107,8 +109,17 @@ int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, ret = iommufd_viommu_get_vdev_id(&nested_domain->vsmmu->core, state->master->dev, &vsid); - if (ret) + /* + * Attaching to a translate nested domain must allocate a vDEVICE prior, + * as CD/ATS invalidations and vevents require a vSID to work properly. + * A abort/bypass domain is allowed to attach w/o vmaster for GBPA case. + */ + if (ret) { + if (cfg == STRTAB_STE_0_CFG_ABORT || + cfg == STRTAB_STE_0_CFG_BYPASS) + return 0; return ret; + } vmaster = kzalloc(sizeof(*vmaster), GFP_KERNEL); if (!vmaster) @@ -138,14 +149,15 @@ void arm_smmu_master_clear_vmaster(struct arm_smmu_master *master) } static int arm_smmu_attach_dev_nested(struct iommu_domain *domain, - struct device *dev) + struct device *dev, + struct iommu_domain *old_domain) { struct arm_smmu_nested_domain *nested_domain = to_smmu_nested_domain(domain); struct arm_smmu_master *master = dev_iommu_priv_get(dev); struct arm_smmu_attach_state state = { .master = master, - .old_domain = iommu_get_domain_for_dev(dev), + .old_domain = old_domain, .ssid = IOMMU_NO_PASID, }; struct arm_smmu_ste ste; |