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Date: Wed, 25 Sep 2019 20:13:54 +0800
From: Jason Wang <jasowang@...hat.com>
To: "Tian, Kevin" <kevin.tian@...el.com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
"intel-gvt-dev@...ts.freedesktop.org"
<intel-gvt-dev@...ts.freedesktop.org>,
"kwankhede@...dia.com" <kwankhede@...dia.com>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"mst@...hat.com" <mst@...hat.com>,
"Bie, Tiwei" <tiwei.bie@...el.com>
Cc: "virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"cohuck@...hat.com" <cohuck@...hat.com>,
"maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
"Liang, Cunming" <cunming.liang@...el.com>,
"Wang, Zhihong" <zhihong.wang@...el.com>,
"rob.miller@...adcom.com" <rob.miller@...adcom.com>,
"Wang, Xiao W" <xiao.w.wang@...el.com>,
"haotian.wang@...ive.com" <haotian.wang@...ive.com>,
"zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
"Wang, Zhi A" <zhi.a.wang@...el.com>,
"jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
"joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
"Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
"airlied@...ux.ie" <airlied@...ux.ie>,
"daniel@...ll.ch" <daniel@...ll.ch>,
"farman@...ux.ibm.com" <farman@...ux.ibm.com>,
"pasic@...ux.ibm.com" <pasic@...ux.ibm.com>,
"sebott@...ux.ibm.com" <sebott@...ux.ibm.com>,
"oberpar@...ux.ibm.com" <oberpar@...ux.ibm.com>,
"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
"gor@...ux.ibm.com" <gor@...ux.ibm.com>,
"borntraeger@...ibm.com" <borntraeger@...ibm.com>,
"akrowiak@...ux.ibm.com" <akrowiak@...ux.ibm.com>,
"freude@...ux.ibm.com" <freude@...ux.ibm.com>,
"Zhu, Lingshan" <lingshan.zhu@...el.com>,
"idos@...lanox.com" <idos@...lanox.com>,
"eperezma@...hat.com" <eperezma@...hat.com>,
"lulu@...hat.com" <lulu@...hat.com>,
"parav@...lanox.com" <parav@...lanox.com>,
"christophe.de.dinechin@...il.com" <christophe.de.dinechin@...il.com>
Subject: Re: [PATCH V2 2/8] mdev: class id support
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@...hat.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
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