Re: [PATCH V2 2/8] mdev: class id support

Jason Wang
2019-09-25T12:14:45Z

On 2019/9/25 下午4:28, Tian, Kevin wrote:
>> From: Jason Wang
>> Sent: Tuesday, September 24, 2019 9:53 PM
>>
>> 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
>> parent with the match method for mdev bus.
>>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>> Documentation/driver-api/vfio-mediated-device.rst | 3 +++
>> 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 | 7 +++++++
>> drivers/vfio/mdev/mdev_driver.c | 14 ++++++++++++++
>> 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, 53 insertions(+)
>>
>> diff --git a/Documentation/driver-api/vfio-mediated-device.rst
>> b/Documentation/driver-api/vfio-mediated-device.rst
>> index 25eb7d5b834b..a5bdc60d62a1 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
>> @@ -165,6 +167,7 @@ register itself with the mdev core driver::
>> extern int mdev_register_device(struct device *dev,
>> const struct mdev_parent_ops *ops);
>>
>> +
>> However, the mdev_parent_ops structure is not required in the function
>> call
>> that a driver should use to unregister itself with the mdev core driver::
>>
>> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c
>> b/drivers/gpu/drm/i915/gvt/kvmgt.c
>> index 23aa3e50cbf8..f793252a3d2a 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_id(mdev, MDEV_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..d258ef1fedb9 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_id(mdev, MDEV_ID_VFIO);
>> return 0;
>> }
>>
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c
>> b/drivers/s390/crypto/vfio_ap_ops.c
>> index 5c0f53c6dde7..2cfd96112aa0 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_id(mdev, MDEV_ID_VFIO);
>> return 0;
>> }
>>
>> diff --git a/drivers/vfio/mdev/mdev_core.c
>> b/drivers/vfio/mdev/mdev_core.c
>> index b558d4cfd082..8764cf4a276d 100644
>> --- a/drivers/vfio/mdev/mdev_core.c
>> +++ b/drivers/vfio/mdev/mdev_core.c
>> @@ -45,6 +45,12 @@ void mdev_set_drvdata(struct mdev_device *mdev,
>> void *data)
>> }
>> EXPORT_SYMBOL(mdev_set_drvdata);
>>
>> +void mdev_set_class_id(struct mdev_device *mdev, u16 id)
>> +{
>> + mdev->class_id = id;
>> +}
>> +EXPORT_SYMBOL(mdev_set_class_id);
>> +
>> struct device *mdev_dev(struct mdev_device *mdev)
>> {
>> return &mdev->dev;
>> @@ -135,6 +141,7 @@ 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: device id.
> class id.

Right, will fix.

Thanks