[v4,09/10] iommufd/selftest: Add test ops to test pasid attach/detach

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index acbbba1c6671..54f59141cc59 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -23,6 +23,10 @@  enum {
 	IOMMU_TEST_OP_DIRTY,
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
 	IOMMU_TEST_OP_TRIGGER_IOPF,
+	IOMMU_TEST_OP_PASID_ATTACH,
+	IOMMU_TEST_OP_PASID_REPLACE,
+	IOMMU_TEST_OP_PASID_DETACH,
+	IOMMU_TEST_OP_PASID_CHECK_DOMAIN,
 };
 
 enum {
@@ -135,6 +139,32 @@  struct iommu_test_cmd {
 			__u32 perm;
 			__u64 addr;
 		} trigger_iopf;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH
+			 * pasid#1024 is for special test, avoid use it
+			 * in normal case.
+			 */
+		} pasid_attach;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH
+			 * pasid#1024 is for special test, avoid use it
+			 * in normal case.
+			 */
+		} 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 b7e0cbb46f9f..421025d57626 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -539,6 +539,8 @@  static int mock_dev_disable_feat(struct device *dev, enum iommu_dev_features fea
 	return 0;
 }
 
+static bool pasid_1024_attached;
+
 static void mock_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 					struct iommu_domain *domain)
 {
@@ -547,6 +549,8 @@  static void mock_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 		switch (domain->type) {
 		case IOMMU_DOMAIN_NESTED:
 		case IOMMU_DOMAIN_UNMANAGED:
+			if (pasid == 1024)
+				pasid_1024_attached = false;
 			break;
 		default:
 			/* should never reach here */
@@ -560,6 +564,20 @@  static int mock_domain_set_dev_pasid_nop(struct iommu_domain *domain,
 					 struct device *dev, ioasid_t pasid,
 					 struct iommu_domain *old)
 {
+	/*
+	 * First attach with pasid 1024 succ, second attach would fail,
+	 * and so on. This is helpful to test the case in which the iommu
+	 * layer needs to rollback to old domain due to driver failure.
+	 */
+	if (pasid == 1024) {
+		if (pasid_1024_attached) {
+			pasid_1024_attached = false;
+			// Fake an error to fail the replacement
+			return -ENOMEM;
+		}
+		pasid_1024_attached = true;
+	}
+
 	return 0;
 }
 
@@ -1476,6 +1494,117 @@  static int iommufd_test_trigger_iopf(struct iommufd_ucmd *ucmd,
 	return 0;
 }
 
+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(ucmd->ictx, &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(ucmd->ictx, &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(ucmd->ictx, &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(ucmd->ictx, 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 iommu_attach_handle *handle;
+	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;
+
+	handle = iommu_attach_handle_get(mdev->dev.iommu_group,
+					 cmd->pasid_check.pasid, 0);
+	if (IS_ERR(handle))
+		attached_domain = NULL;
+	else
+		attached_domain = handle->domain;
+
+	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(ucmd->ictx, &hwpt->obj);
+out_put_dev:
+	iommufd_put_object(ucmd->ictx, &sobj->obj);
+	return rc;
+}
+
 void iommufd_selftest_destroy(struct iommufd_object *obj)
 {
 	struct selftest_obj *sobj = container_of(obj, struct selftest_obj, obj);
@@ -1553,6 +1682,14 @@  int iommufd_test(struct iommufd_ucmd *ucmd)
 					  cmd->dirty.flags);
 	case IOMMU_TEST_OP_TRIGGER_IOPF:
 		return iommufd_test_trigger_iopf(ucmd, cmd);
+	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;
 	}
@@ -1597,6 +1734,7 @@  int __init iommufd_test_init(void)
 
 	mock_iommu_iopf_queue = iopf_queue_alloc("mock-iopfq");
 	mock_iommu_device.max_pasids = (1 << 20);
+	pasid_1024_attached = false;
 
 	return 0;