[PATCH 6/8] iommufd/selftest: Add test ops to test pasid attach/detach

[Yi Liu]

This adds 4 test ops for pasid attach/replace/detach testing. There are
ops to attach/detach pasid, and also op to check the attached domain of
a pasid.

Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/iommu/iommufd/iommufd_test.h |  24 ++++++
 drivers/iommu/iommufd/selftest.c     | 116 +++++++++++++++++++++++++++
 2 files changed, 140 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 35d6207a96dd..67c2a8508b92 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -22,6 +22,10 @@ enum {
 	IOMMU_TEST_OP_MOCK_DOMAIN_FLAGS,
 	IOMMU_TEST_OP_DIRTY,
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
+	IOMMU_TEST_OP_PASID_ATTACH,
+	IOMMU_TEST_OP_PASID_REPLACE,
+	IOMMU_TEST_OP_PASID_DETACH,
+	IOMMU_TEST_OP_PASID_CHECK_DOMAIN,
 };
 
 enum {
@@ -126,6 +130,26 @@ struct iommu_test_cmd {
 			__u32 id;
 			__u32 iotlb;
 		} check_iotlb;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH */
+		} pasid_attach;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH */
+		} pasid_replace;
+		struct {
+			__u32 pasid;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_DETACH */
+		} pasid_detach;
+		struct {
+			__u32 pasid;
+			__u32 hwpt_id;
+			__u64 out_result_ptr;
+			/* @id is stdev_id for IOMMU_TEST_OP_HWPT_GET_DOMAIN */
+		} pasid_check;
 	};
 	__u32 last;
 };
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 9b9fd3f50264..a3139ad534a1 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -1340,6 +1340,114 @@ static int iommufd_test_dirty(struct iommufd_ucmd *ucmd, unsigned int mockpt_id,
 	return rc;
 }
 
+static int iommufd_test_pasid_attach(struct iommufd_ucmd *ucmd,
+				     struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+	int rc;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	rc = iommufd_device_pasid_attach(sobj->idev.idev,
+					 cmd->pasid_attach.pasid,
+					 &cmd->pasid_attach.pt_id);
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
+static int iommufd_test_pasid_replace(struct iommufd_ucmd *ucmd,
+				      struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+	int rc;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	rc = iommufd_device_pasid_replace(sobj->idev.idev,
+					  cmd->pasid_attach.pasid,
+					  &cmd->pasid_attach.pt_id);
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
+static int iommufd_test_pasid_detach(struct iommufd_ucmd *ucmd,
+				     struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	iommufd_device_pasid_detach(sobj->idev.idev,
+				    cmd->pasid_detach.pasid);
+	iommufd_put_object(&sobj->obj);
+	return 0;
+}
+
+static inline struct iommufd_hw_pagetable *
+iommufd_get_hwpt(struct iommufd_ucmd *ucmd, u32 id)
+{
+	struct iommufd_object *pt_obj;
+
+	pt_obj = iommufd_get_object(ucmd->ictx, id, IOMMUFD_OBJ_ANY);
+	if (IS_ERR(pt_obj))
+		return ERR_CAST(pt_obj);
+
+	if (pt_obj->type != IOMMUFD_OBJ_HWPT_NESTED &&
+	    pt_obj->type != IOMMUFD_OBJ_HWPT_PAGING) {
+		iommufd_put_object(pt_obj);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return container_of(pt_obj, struct iommufd_hw_pagetable, obj);
+}
+
+static int iommufd_test_pasid_check_domain(struct iommufd_ucmd *ucmd,
+					   struct iommu_test_cmd *cmd)
+{
+	struct iommu_domain *attached_domain, *expect_domain = NULL;
+	struct iommufd_hw_pagetable *hwpt = NULL;
+	struct selftest_obj *sobj;
+	struct mock_dev *mdev;
+	bool result;
+	int rc = 0;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	mdev = sobj->idev.mock_dev;
+
+	attached_domain = iommu_get_domain_for_dev_pasid(&mdev->dev,
+							 cmd->pasid_check.pasid, 0);
+	if (IS_ERR(attached_domain))
+		attached_domain = NULL;
+
+	if (cmd->pasid_check.hwpt_id) {
+		hwpt = iommufd_get_hwpt(ucmd, cmd->pasid_check.hwpt_id);
+		if (IS_ERR(hwpt)) {
+			rc = PTR_ERR(hwpt);
+			goto out_put_dev;
+		}
+		expect_domain = hwpt->domain;
+	}
+
+	result = (attached_domain == expect_domain) ? 1 : 0;
+	if (copy_to_user(u64_to_user_ptr(cmd->pasid_check.out_result_ptr),
+			 &result, sizeof(result)))
+		rc = -EFAULT;
+	if (hwpt)
+		iommufd_put_object(&hwpt->obj);
+out_put_dev:
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
 void iommufd_selftest_destroy(struct iommufd_object *obj)
 {
 	struct selftest_obj *sobj = container_of(obj, struct selftest_obj, obj);
@@ -1415,6 +1523,14 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 					  cmd->dirty.page_size,
 					  u64_to_user_ptr(cmd->dirty.uptr),
 					  cmd->dirty.flags);
+	case IOMMU_TEST_OP_PASID_ATTACH:
+		return iommufd_test_pasid_attach(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_REPLACE:
+		return iommufd_test_pasid_replace(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_DETACH:
+		return iommufd_test_pasid_detach(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_CHECK_DOMAIN:
+		return iommufd_test_pasid_check_domain(ucmd, cmd);
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.34.1