@@ -102,12 +102,14 @@ structure to represent a mediated device's driver::
* @probe: called when new device created
* @remove: called when device removed
* @driver: device driver structure
+ * @id_table: the ids serviced by this driver
*/
struct mdev_driver {
const char *name;
int (*probe) (struct device *dev);
void (*remove) (struct device *dev);
struct device_driver driver;
+ const struct mdev_class_id *id_table;
};
A mediated bus driver for mdev should use this structure in the function calls
@@ -170,6 +172,9 @@ that a driver should use to unregister itself with the mdev core driver::
extern void mdev_unregister_device(struct device *dev);
+It is also required to specify the class_id in create() callback through::
+
+ int mdev_set_class(struct mdev_device *mdev, u16 id);
Mediated Device Management Interface Through sysfs
==================================================
@@ -678,6 +678,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
dev_name(mdev_dev(mdev)));
ret = 0;
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
out:
return ret;
}
@@ -129,6 +129,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
private->sch->schid.ssid,
private->sch->schid.sch_no);
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
return 0;
}
@@ -343,6 +343,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
mutex_unlock(&matrix_dev->lock);
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
return 0;
}
@@ -45,6 +45,17 @@ void mdev_set_drvdata(struct mdev_device *mdev, void *data)
}
EXPORT_SYMBOL(mdev_set_drvdata);
+/*
+ * Specify the class for the mdev device, this must be called during
+ * create() callback.
+ */
+void mdev_set_class(struct mdev_device *mdev, u16 id)
+{
+ WARN_ON(mdev->class_id);
+ mdev->class_id = id;
+}
+EXPORT_SYMBOL(mdev_set_class);
+
struct device *mdev_dev(struct mdev_device *mdev)
{
return &mdev->dev;
@@ -324,6 +335,12 @@ int mdev_device_create(struct kobject *kobj,
if (ret)
goto ops_create_fail;
+ if (!mdev->class_id) {
+ ret = -EINVAL;
+ dev_warn(dev, "mdev vendor driver failed to specify device class\n");
+ goto add_fail;
+ }
+
ret = device_add(&mdev->dev);
if (ret)
goto add_fail;
@@ -69,8 +69,33 @@ static int mdev_remove(struct device *dev)
return 0;
}
+static int mdev_match(struct device *dev, struct device_driver *drv)
+{
+ unsigned int i;
+ struct mdev_device *mdev = to_mdev_device(dev);
+ struct mdev_driver *mdrv = to_mdev_driver(drv);
+ const struct mdev_class_id *ids = mdrv->id_table;
+
+ if (!ids)
+ return 0;
+
+ for (i = 0; ids[i].id; i++)
+ if (ids[i].id == mdev->class_id)
+ return 1;
+ return 0;
+}
+
+static int mdev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return add_uevent_var(env, "MODALIAS=mdev:c%02X", mdev->class_id);
+}
+
struct bus_type mdev_bus_type = {
.name = "mdev",
+ .match = mdev_match,
+ .uevent = mdev_uevent,
.probe = mdev_probe,
.remove = mdev_remove,
};
@@ -33,6 +33,7 @@ struct mdev_device {
struct kobject *type_kobj;
struct device *iommu_device;
bool active;
+ u16 class_id;
};
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
@@ -120,10 +120,16 @@ static void vfio_mdev_remove(struct device *dev)
vfio_del_group_dev(dev);
}
+static const struct mdev_class_id vfio_id_table[] = {
+ { MDEV_CLASS_ID_VFIO },
+ { 0 },
+};
+
static struct mdev_driver vfio_mdev_driver = {
.name = "vfio_mdev",
.probe = vfio_mdev_probe,
.remove = vfio_mdev_remove,
+ .id_table = vfio_id_table,
};
static int __init vfio_mdev_init(void)
@@ -118,6 +118,7 @@ struct mdev_type_attribute mdev_type_attr_##_name = \
* @probe: called when new device created
* @remove: called when device removed
* @driver: device driver structure
+ * @id_table: the ids serviced by this driver
*
**/
struct mdev_driver {
@@ -125,6 +126,7 @@ struct mdev_driver {
int (*probe)(struct device *dev);
void (*remove)(struct device *dev);
struct device_driver driver;
+ const struct mdev_class_id *id_table;
};
#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
@@ -132,6 +134,7 @@ struct mdev_driver {
void *mdev_get_drvdata(struct mdev_device *mdev);
void mdev_set_drvdata(struct mdev_device *mdev, void *data);
const guid_t *mdev_uuid(struct mdev_device *mdev);
+void mdev_set_class(struct mdev_device *mdev, u16 id);
extern struct bus_type mdev_bus_type;
@@ -145,4 +148,9 @@ struct device *mdev_parent_dev(struct mdev_device *mdev);
struct device *mdev_dev(struct mdev_device *mdev);
struct mdev_device *mdev_from_dev(struct device *dev);
+enum {
+ MDEV_CLASS_ID_VFIO = 1,
+ /* New entries must be added here */
+};
+
#endif /* MDEV_H */
@@ -821,4 +821,12 @@ struct wmi_device_id {
const void *context;
};
+/**
+ * struct mdev_class_id - MDEV device class identifier
+ * @id: Used to identify a specific class of device, e.g vfio-mdev device.
+ */
+struct mdev_class_id {
+ __u16 id;
+};
+
#endif /* LINUX_MOD_DEVICETABLE_H */
@@ -561,6 +561,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
mbochs_reset(mdev);
mbochs_used_mbytes += type->mbytes;
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
return 0;
err_mem:
@@ -269,6 +269,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
mdpy_reset(mdev);
mdpy_count++;
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
return 0;
}
@@ -755,6 +755,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
list_add(&mdev_state->next, &mdev_devices_list);
mutex_unlock(&mdev_list_lock);
+ mdev_set_class(mdev, MDEV_CLASS_ID_VFIO);
return 0;
}