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@xxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
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,
--
2.43.0
