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

From: Jason Wang <jasowang@redhat.com>
To: "Tian, Kevin" <kevin.tian@intel.com>,
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Subject: Re: [PATCH V2 2/8] mdev: class id support
Date: Wed, 25 Sep 2019 20:13:54 +0800	[thread overview]
Message-ID: <c7e8a56a-d805-7cf4-2704-dc891dd23713@redhat.com> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D19D58F6AE@SHSMSX104.ccr.corp.intel.com>

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