@@ -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 +45,16 @@ 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 +334,12 @@ 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;
}
Mdev bus only supports vfio driver right now, so it doesn't implement match method. But in the future, we may add drivers other than vfio, the first driver could be virtio-mdev. This means we need to add device class id support in bus match method to pair the mdev device and mdev driver correctly. So this patch adds id_table to mdev_driver and class_id for mdev device with the match method for mdev bus. Signed-off-by: Jason Wang <jasowang@redhat.com> --- .../driver-api/vfio-mediated-device.rst | 5 ++++ drivers/gpu/drm/i915/gvt/kvmgt.c | 1 + drivers/s390/cio/vfio_ccw_ops.c | 1 + drivers/s390/crypto/vfio_ap_ops.c | 1 + drivers/vfio/mdev/mdev_core.c | 16 ++++++++++++ drivers/vfio/mdev/mdev_driver.c | 25 +++++++++++++++++++ drivers/vfio/mdev/mdev_private.h | 1 + drivers/vfio/mdev/vfio_mdev.c | 6 +++++ include/linux/mdev.h | 8 ++++++ include/linux/mod_devicetable.h | 8 ++++++ samples/vfio-mdev/mbochs.c | 1 + samples/vfio-mdev/mdpy.c | 1 + samples/vfio-mdev/mtty.c | 1 + 13 files changed, 75 insertions(+)