Implement the viommu alloc/free functions to increase/reduce refcount of its dependent mock iommu device. User space can verify this loop via the IOMMU_VIOMMU_TYPE_SELFTEST.
Reviewed-by: Kevin Tian kevin.tian@intel.com Reviewed-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com --- drivers/iommu/iommufd/iommufd_test.h | 2 + drivers/iommu/iommufd/selftest.c | 67 ++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+)
diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h index f4bc23a92f9a..edced4ac7cd3 100644 --- a/drivers/iommu/iommufd/iommufd_test.h +++ b/drivers/iommu/iommufd/iommufd_test.h @@ -180,4 +180,6 @@ struct iommu_hwpt_invalidate_selftest { __u32 iotlb_id; };
+#define IOMMU_VIOMMU_TYPE_SELFTEST 0xdeadbeef + #endif diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index 4f67a83f667a..31c8f78a3a66 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -134,6 +134,7 @@ to_mock_domain(struct iommu_domain *domain)
struct mock_iommu_domain_nested { struct iommu_domain domain; + struct mock_viommu *mock_viommu; struct mock_iommu_domain *parent; u32 iotlb[MOCK_NESTED_DOMAIN_IOTLB_NUM]; }; @@ -144,6 +145,16 @@ to_mock_nested(struct iommu_domain *domain) return container_of(domain, struct mock_iommu_domain_nested, domain); }
+struct mock_viommu { + struct iommufd_viommu core; + struct mock_iommu_domain *s2_parent; +}; + +static inline struct mock_viommu *to_mock_viommu(struct iommufd_viommu *viommu) +{ + return container_of(viommu, struct mock_viommu, core); +} + enum selftest_obj_type { TYPE_IDEV, }; @@ -569,6 +580,61 @@ static int mock_dev_disable_feat(struct device *dev, enum iommu_dev_features fea return 0; }
+static void mock_viommu_destroy(struct iommufd_viommu *viommu) +{ + struct mock_iommu_device *mock_iommu = container_of( + viommu->iommu_dev, struct mock_iommu_device, iommu_dev); + + if (refcount_dec_and_test(&mock_iommu->users)) + complete(&mock_iommu->complete); + + /* iommufd core frees mock_viommu and viommu */ +} + +static struct iommu_domain * +mock_viommu_alloc_domain_nested(struct iommufd_viommu *viommu, u32 flags, + const struct iommu_user_data *user_data) +{ + struct mock_viommu *mock_viommu = to_mock_viommu(viommu); + struct mock_iommu_domain_nested *mock_nested; + + if (flags & ~IOMMU_HWPT_FAULT_ID_VALID) + return ERR_PTR(-EOPNOTSUPP); + + mock_nested = __mock_domain_alloc_nested(user_data); + if (IS_ERR(mock_nested)) + return ERR_CAST(mock_nested); + mock_nested->mock_viommu = mock_viommu; + mock_nested->parent = mock_viommu->s2_parent; + return &mock_nested->domain; +} + +static struct iommufd_viommu_ops mock_viommu_ops = { + .destroy = mock_viommu_destroy, + .alloc_domain_nested = mock_viommu_alloc_domain_nested, +}; + +static struct iommufd_viommu *mock_viommu_alloc(struct device *dev, + struct iommu_domain *domain, + struct iommufd_ctx *ictx, + unsigned int viommu_type) +{ + struct mock_iommu_device *mock_iommu = + iommu_get_iommu_dev(dev, struct mock_iommu_device, iommu_dev); + struct mock_viommu *mock_viommu; + + if (viommu_type != IOMMU_VIOMMU_TYPE_SELFTEST) + return ERR_PTR(-EOPNOTSUPP); + + mock_viommu = iommufd_viommu_alloc(ictx, struct mock_viommu, core, + &mock_viommu_ops); + if (IS_ERR(mock_viommu)) + return ERR_CAST(mock_viommu); + + refcount_inc(&mock_iommu->users); + return &mock_viommu->core; +} + static const struct iommu_ops mock_ops = { /* * IOMMU_DOMAIN_BLOCKED cannot be returned from def_domain_type() @@ -588,6 +654,7 @@ static const struct iommu_ops mock_ops = { .dev_enable_feat = mock_dev_enable_feat, .dev_disable_feat = mock_dev_disable_feat, .user_pasid_table = true, + .viommu_alloc = mock_viommu_alloc, .default_domain_ops = &(struct iommu_domain_ops){ .free = mock_domain_free,