> -----Original Message-----
> From: Jason Wang <jasow...@redhat.com>
> Sent: Wednesday, October 23, 2019 8:08 AM
> To: k...@vger.kernel.org; linux-s...@vger.kernel.org; linux-
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> lingshan....@intel.com; Ido Shamay <i...@mellanox.com>;
> epere...@redhat.com; l...@redhat.com; Parav Pandit
> <pa...@mellanox.com>; christophe.de.dinec...@gmail.com;
> kevin.t...@intel.com; stefa...@redhat.com; Jason Wang
> <jasow...@redhat.com>
> Subject: [PATCH V5 1/6] mdev: class id support
> 
> 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 <jasow...@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                 | 18 +++++++++++++++
>  drivers/vfio/mdev/mdev_driver.c               | 22 +++++++++++++++++++
>  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, 74 insertions(+)
> 
> diff --git a/Documentation/driver-api/vfio-mediated-device.rst
> b/Documentation/driver-api/vfio-mediated-device.rst
> index 25eb7d5b834b..6709413bee29 100644
> --- a/Documentation/driver-api/vfio-mediated-device.rst
> +++ b/Documentation/driver-api/vfio-mediated-device.rst
> @@ -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
> ==================================================
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c
> b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 343d79c1cb7e..6420f0dbd31b 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -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;
>  }
> diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
> index f0d71ab77c50..cf2c013ae32f 100644
> --- a/drivers/s390/cio/vfio_ccw_ops.c
> +++ b/drivers/s390/cio/vfio_ccw_ops.c
> @@ -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;
>  }
> 
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c
> b/drivers/s390/crypto/vfio_ap_ops.c
> index 5c0f53c6dde7..07c31070afeb 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -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;
>  }
> 
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index b558d4cfd082..3a9c52d71b4e 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -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;
> @@ -135,6 +145,7 @@ static int mdev_device_remove_cb(struct device *dev,
> void *data)
>   * mdev_register_device : Register a device
>   * @dev: device structure representing parent device.
>   * @ops: Parent device operation structure to be registered.
> + * @id: class id.
>   *
>   * Add device to list of registered parent devices.
>   * Returns a negative value on error, otherwise 0.
> @@ -324,6 +335,13 @@ int mdev_device_create(struct kobject *kobj,
>       if (ret)
>               goto ops_create_fail;
> 
> +     if (!mdev->class_id) {
> +             ret = -EINVAL;
> +             WARN(1, "class id must be specified for device %s\n",
> +                  dev_name(dev));
> +             goto add_fail;
> +     }
> +
>       ret = device_add(&mdev->dev);
>       if (ret)
>               goto add_fail;
> diff --git a/drivers/vfio/mdev/mdev_driver.c
> b/drivers/vfio/mdev/mdev_driver.c index 0d3223aee20b..319d886ffaf7 100644
> --- a/drivers/vfio/mdev/mdev_driver.c
> +++ b/drivers/vfio/mdev/mdev_driver.c
> @@ -69,8 +69,30 @@ 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;
> +
> +     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,
>  };
> diff --git a/drivers/vfio/mdev/mdev_private.h
> b/drivers/vfio/mdev/mdev_private.h
> index 7d922950caaf..c65f436c1869 100644
> --- a/drivers/vfio/mdev/mdev_private.h
> +++ b/drivers/vfio/mdev/mdev_private.h
> @@ -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)
> diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
> index 30964a4e0a28..7b24ee9cb8dd 100644
> --- a/drivers/vfio/mdev/vfio_mdev.c
> +++ b/drivers/vfio/mdev/vfio_mdev.c
> @@ -120,10 +120,16 @@ static void vfio_mdev_remove(struct device *dev)
>       vfio_del_group_dev(dev);
>  }
> 
> +static const struct mdev_class_id 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 = id_table,
>  };
> 
>  static int __init vfio_mdev_init(void)
> diff --git a/include/linux/mdev.h b/include/linux/mdev.h index
> 0ce30ca78db0..78b69d09eb54 100644
> --- a/include/linux/mdev.h
> +++ b/include/linux/mdev.h
> @@ -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 */
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 5714fd35a83c..f32c6e44fb1a 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.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 */
> diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index
> ac5c8c17b1ff..115bc5074656 100644
> --- a/samples/vfio-mdev/mbochs.c
> +++ b/samples/vfio-mdev/mbochs.c
> @@ -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:
> diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index
> cc86bf6566e4..665614574d50 100644
> --- a/samples/vfio-mdev/mdpy.c
> +++ b/samples/vfio-mdev/mdpy.c
> @@ -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;
>  }
> 
> diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index
> ce84a300a4da..90da12ff7fd9 100644
> --- a/samples/vfio-mdev/mtty.c
> +++ b/samples/vfio-mdev/mtty.c
> @@ -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;
>  }
> 
> --
> 2.19.1
Reviewed-by: Parav Pandit <pa...@mellanox.com>
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