From: Jason Wang <jasowang@redhat.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com,
alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, maxime.coquelin@redhat.com,
cunming.liang@intel.com, zhihong.wang@intel.com,
rob.miller@broadcom.com, xiao.w.wang@intel.com,
haotian.wang@sifive.com, zhenyuw@linux.intel.com,
zhi.a.wang@intel.com, jani.nikula@linux.intel.com,
joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com,
airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com,
pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com,
heiko.carstens@de.ibm.com, gor@linux.ibm.com,
borntraeger@de.ibm.com, akrowiak@linux.ibm.com,
freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com,
eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com,
christophe.de.dinechin@gmail.com, kevin.tian@intel.com
Subject: Re: [PATCH V3 4/7] mdev: introduce device specific ops
Date: Tue, 15 Oct 2019 20:17:01 +0800 [thread overview]
Message-ID: <eb7ecd99-7465-6be4-7ecd-84c11f66e0ac@redhat.com> (raw)
In-Reply-To: <20191015124137.4f948bd2.cohuck@redhat.com>
On 2019/10/15 下午6:41, Cornelia Huck wrote:
> On Fri, 11 Oct 2019 16:15:54 +0800
> Jason Wang <jasowang@redhat.com> wrote:
>
>> Currently, except for the create and remove, the rest of
>> mdev_parent_ops is designed for vfio-mdev driver only and may not help
>> for kernel mdev driver. With the help of class id, this patch
>> introduces device specific callbacks inside mdev_device
>> structure. This allows different set of callback to be used by
>> vfio-mdev and virtio-mdev.
>>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>> .../driver-api/vfio-mediated-device.rst | 22 +++++---
>> MAINTAINERS | 1 +
>> drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++---
>> drivers/s390/cio/vfio_ccw_ops.c | 18 ++++---
>> drivers/s390/crypto/vfio_ap_ops.c | 14 +++--
>> drivers/vfio/mdev/mdev_core.c | 9 +++-
>> drivers/vfio/mdev/mdev_private.h | 1 +
>> drivers/vfio/mdev/vfio_mdev.c | 37 ++++++-------
>> include/linux/mdev.h | 42 +++------------
>> include/linux/vfio_mdev.h | 52 +++++++++++++++++++
>> samples/vfio-mdev/mbochs.c | 20 ++++---
>> samples/vfio-mdev/mdpy.c | 21 +++++---
>> samples/vfio-mdev/mtty.c | 18 ++++---
>> 13 files changed, 177 insertions(+), 96 deletions(-)
>> create mode 100644 include/linux/vfio_mdev.h
>>
>> diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
>> index 2035e48da7b2..553574ebba73 100644
>> --- a/Documentation/driver-api/vfio-mediated-device.rst
>> +++ b/Documentation/driver-api/vfio-mediated-device.rst
>> @@ -152,11 +152,20 @@ callbacks per mdev parent device, per mdev type, or any other categorization.
>> Vendor drivers are expected to be fully asynchronous in this respect or
>> provide their own internal resource protection.)
>>
>> -The callbacks in the mdev_parent_ops structure are as follows:
>> +In order to support multiple types of device/driver, device needs to
>> +provide both class_id and device_ops through:
> "As multiple types of mediated devices may be supported, the device
> needs to set up the class id and the device specific callbacks via:"
>
> ?
>
>>
>> -* open: open callback of mediated device
>> -* close: close callback of mediated device
>> -* ioctl: ioctl callback of mediated device
>> + void mdev_set_class(struct mdev_device *mdev, u16 id, const void *ops);
>> +
>> +The class_id is used to be paired with ids in id_table in mdev_driver
>> +structure for probing the correct driver.
> "The class id (specified in id) is used to match a device with an mdev
> driver via its id table."
>
> ?
>
>> The device_ops is device
>> +specific callbacks which can be get through mdev_get_dev_ops()
>> +function by mdev bus driver.
> "The device specific callbacks (specified in *ops) are obtainable via
> mdev_get_dev_ops() (for use by the mdev bus driver.)"
>
> ?
>
>> For vfio-mdev device, its device specific
>> +ops are as follows:
> "A vfio-mdev device (class id MDEV_ID_VFIO) uses the following
> device-specific ops:"
>
> ?
All you propose is better than what I wrote, will change the docs.
>
>> +
>> +* open: open callback of vfio mediated device
>> +* close: close callback of vfio mediated device
>> +* ioctl: ioctl callback of vfio mediated device
>> * read : read emulation callback
>> * write: write emulation callback
>> * mmap: mmap emulation callback
>> @@ -167,9 +176,10 @@ register itself with the mdev core driver::
>> extern int mdev_register_device(struct device *dev,
>> const struct mdev_parent_ops *ops);
>>
>> -It is also required to specify the class_id through::
>> +It is also required to specify the class_id and device specific ops through::
>>
>> - extern int mdev_set_class(struct device *dev, u16 id);
>> + extern int mdev_set_class(struct device *dev, u16 id,
>> + const void *ops);
> Apologies if that has already been discussed, but do we want a 1:1
> relationship between id and ops, or can different devices with the same
> id register different ops?
I think we have a N:1 mapping between id and ops, e.g we want both
virtio-mdev and vhost-mdev use a single set of device ops.
Thanks
> If the former, would it make sense to first
> register the ops for an id (once), and then have the ->create callback
> only set the class id (with the core doing the lookup of the 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::
next prev parent reply other threads:[~2019-10-15 12:17 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-11 8:15 [PATCH V3 0/7] mdev based hardware virtio offloading support Jason Wang
2019-10-11 8:15 ` [PATCH V3 1/7] mdev: class id support Jason Wang
2019-10-15 10:26 ` Cornelia Huck
2019-10-15 12:12 ` Jason Wang
2019-10-15 16:38 ` Alex Williamson
2019-10-16 4:38 ` Jason Wang
2019-10-16 4:57 ` Parav Pandit
2019-10-16 10:37 ` Jason Wang
2019-10-17 8:27 ` Jason Wang
2019-10-11 8:15 ` [PATCH V3 2/7] mdev: bus uevent support Jason Wang
2019-10-15 10:27 ` Cornelia Huck
2019-10-15 12:13 ` Jason Wang
2019-10-16 5:06 ` Parav Pandit
2019-10-11 8:15 ` [PATCH V3 3/7] modpost: add support for mdev class id Jason Wang
2019-10-11 8:15 ` [PATCH V3 4/7] mdev: introduce device specific ops Jason Wang
2019-10-15 10:41 ` Cornelia Huck
2019-10-15 12:17 ` Jason Wang [this message]
2019-10-15 17:26 ` Alex Williamson
2019-10-11 8:15 ` [PATCH V3 5/7] mdev: introduce virtio device and its device ops Jason Wang
2019-10-14 17:23 ` Stefan Hajnoczi
2019-10-15 3:27 ` Jason Wang
2019-10-11 8:15 ` [PATCH V3 6/7] virtio: introduce a mdev based transport Jason Wang
2019-10-14 17:39 ` Stefan Hajnoczi
2019-10-15 3:29 ` Jason Wang
2019-10-11 8:15 ` [PATCH V3 7/7] docs: sample driver to demonstrate how to implement virtio-mdev framework Jason Wang
2019-10-14 17:49 ` [PATCH V3 0/7] mdev based hardware virtio offloading support Stefan Hajnoczi
2019-10-15 3:37 ` Jason Wang
2019-10-15 14:37 ` Stefan Hajnoczi
2019-10-17 1:42 ` Jason Wang
2019-10-17 9:43 ` Stefan Hajnoczi
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