iommufd 6.18 merge window pull

Two minor fixes
 
 - Make the selftest work again on x86 platforms with iommus enabled
 
 - Fix a compiler warning in the userspace kselftest
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Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd

Pull iommufd updates from Jason Gunthorpe:
 "Two minor fixes:

   - Make the selftest work again on x86 platforms with iommus enabled

   - Fix a compiler warning in the userspace kselftest"

* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd:
  iommufd: Register iommufd mock devices with fwspec
  iommu/selftest: prevent use of uninitialized variable

drivers/iommu/iommu-priv.h

@@ -37,6 +37,8 @@ void iommu_device_unregister_bus(struct iommu_device *iommu,
 				 const struct bus_type *bus,
 				 struct notifier_block *nb);
 
+int iommu_mock_device_add(struct device *dev, struct iommu_device *iommu);
+
 struct iommu_attach_handle *iommu_attach_handle_get(struct iommu_group *group,
 						    ioasid_t pasid,
 						    unsigned int type);

drivers/iommu/iommu.c

@@ -304,6 +304,7 @@ void iommu_device_unregister_bus(struct iommu_device *iommu,
 				 struct notifier_block *nb)
 {
 	bus_unregister_notifier(bus, nb);
+	fwnode_remove_software_node(iommu->fwnode);
 	iommu_device_unregister(iommu);
 }
 EXPORT_SYMBOL_GPL(iommu_device_unregister_bus);
@@ -326,6 +327,12 @@ int iommu_device_register_bus(struct iommu_device *iommu,
 	if (err)
 		return err;
 
+	iommu->fwnode = fwnode_create_software_node(NULL, NULL);
+	if (IS_ERR(iommu->fwnode)) {
+		bus_unregister_notifier(bus, nb);
+		return PTR_ERR(iommu->fwnode);
+	}
+
 	spin_lock(&iommu_device_lock);
 	list_add_tail(&iommu->list, &iommu_device_list);
 	spin_unlock(&iommu_device_lock);
@@ -335,9 +342,28 @@ int iommu_device_register_bus(struct iommu_device *iommu,
 		iommu_device_unregister_bus(iommu, bus, nb);
 		return err;
 	}
+	WRITE_ONCE(iommu->ready, true);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(iommu_device_register_bus);
+
+int iommu_mock_device_add(struct device *dev, struct iommu_device *iommu)
+{
+	int rc;
+
+	mutex_lock(&iommu_probe_device_lock);
+	rc = iommu_fwspec_init(dev, iommu->fwnode);
+	mutex_unlock(&iommu_probe_device_lock);
+
+	if (rc)
+		return rc;
+
+	rc = device_add(dev);
+	if (rc)
+		iommu_fwspec_free(dev);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(iommu_mock_device_add);
 #endif
 
 static struct dev_iommu *dev_iommu_get(struct device *dev)

drivers/iommu/iommufd/selftest.c

@@ -1126,7 +1126,7 @@ static struct mock_dev *mock_dev_create(unsigned long dev_flags)
 		goto err_put;
 	}
 
-	rc = device_add(&mdev->dev);
+	rc = iommu_mock_device_add(&mdev->dev, &mock_iommu.iommu_dev);
 	if (rc)
 		goto err_put;
 	return mdev;

tools/testing/selftests/iommu/iommufd_utils.h

@@ -1042,15 +1042,13 @@ static int _test_cmd_trigger_vevents(int fd, __u32 dev_id, __u32 nvevents)
 			.dev_id = dev_id,
 		},
 	};
-	int ret;
 
 	while (nvevents--) {
-		ret = ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_VEVENT),
-			    &trigger_vevent_cmd);
-		if (ret < 0)
+		if (!ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_VEVENT),
+			    &trigger_vevent_cmd))
 			return -1;
 	}
-	return ret;
+	return 0;
 }
 
 #define test_cmd_trigger_vevents(dev_id, nvevents) \