From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 24 Oct 2019 14:13:30 -0600 From: Alex Williamson Subject: Re: [PATCH V5 1/6] mdev: class id support Message-ID: <20191024141330.017a6480@x1.home> In-Reply-To: <20191024134636.253131c5@x1.home> References: <20191023130752.18980-1-jasowang@redhat.com> <20191023130752.18980-2-jasowang@redhat.com> <20191023154204.31d74866@x1.home> <38bdf762-524a-e0f1-6e9a-1102adfe8fb1@redhat.com> <20191024134636.253131c5@x1.home> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: netdev-owner@vger.kernel.org List-ID: To: Jason Wang 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, mst@redhat.com, tiwei.bie@intel.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, 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, stefanha@redhat.com On Thu, 24 Oct 2019 13:46:36 -0600 Alex Williamson wrote: > On Thu, 24 Oct 2019 11:27:36 +0800 > Jason Wang wrote: >=20 > > On 2019/10/24 =E4=B8=8A=E5=8D=885:42, Alex Williamson wrote: =20 > > > On Wed, 23 Oct 2019 21:07:47 +0800 > > > Jason Wang wrote: > > > =20 > > >> Mdev bus only supports vfio driver right now, so it doesn't implemen= t > > >> 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 > > >> --- > > >> .../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/Doc= umentation/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 dri= ver:: > > >> * @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 { > > >> =09 const char *name; > > >> =09 int (*probe) (struct device *dev); > > >> =09 void (*remove) (struct device *dev); > > >> =09 struct device_driver driver; > > >> +=09 const struct mdev_class_id *id_table; > > >> }; > > >> =20 > > >> A mediated bus driver for mdev should use this structure in the fu= nction calls > > >> @@ -170,6 +172,9 @@ that a driver should use to unregister itself wi= th the mdev core driver:: > > >> =20 > > >> =09extern void mdev_unregister_device(struct device *dev); > > >> =20 > > >> +It is also required to specify the class_id in create() callback th= rough:: > > >> + > > >> +=09int mdev_set_class(struct mdev_device *mdev, u16 id); > > >> =20 > > >> Mediated Device Management Interface Through sysfs > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D > > >> 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 *kob= j, struct mdev_device *mdev) > > >> =09=09 dev_name(mdev_dev(mdev))); > > >> =09ret =3D 0; > > >> =20 > > >> +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > > >> out: > > >> =09return 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) > > >> =09=09=09 private->sch->schid.ssid, > > >> =09=09=09 private->sch->schid.sch_no); > > >> =20 > > >> +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > > >> =09return 0; > > >> } > > >> =20 > > >> 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 *k= obj, struct mdev_device *mdev) > > >> =09list_add(&matrix_mdev->node, &matrix_dev->mdev_list); > > >> =09mutex_unlock(&matrix_dev->lock); > > >> =20 > > >> +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > > >> =09return 0; > > >> } > > >> =20 > > >> 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, v= oid *data) > > >> } > > >> EXPORT_SYMBOL(mdev_set_drvdata); > > >> =20 > > >> +/* Specify the class for the mdev device, this must be called durin= g > > >> + * create() callback. > > >> + */ > > >> +void mdev_set_class(struct mdev_device *mdev, u16 id) > > >> +{ > > >> +=09WARN_ON(mdev->class_id); > > >> +=09mdev->class_id =3D id; > > >> +} > > >> +EXPORT_SYMBOL(mdev_set_class); > > >> + > > >> struct device *mdev_dev(struct mdev_device *mdev) > > >> { > > >> =09return &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, > > >> =09if (ret) > > >> =09=09goto ops_create_fail; > > >> =20 > > >> +=09if (!mdev->class_id) { > > >> +=09=09ret =3D -EINVAL; > > >> +=09=09WARN(1, "class id must be specified for device %s\n", > > >> +=09=09 dev_name(dev)); =20 > > > Nit, dev_warn(dev, "mdev vendor driver failed to specify device class= \n"); =20 > >=20 > >=20 > > Will fix. > >=20 > > =20 > > > =20 > > >> +=09=09goto add_fail; > > >> +=09} > > >> + > > >> =09ret =3D device_add(&mdev->dev); > > >> =09if (ret) > > >> =09=09goto add_fail; > > >> diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mde= v_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) > > >> =09return 0; > > >> } > > >> =20 > > >> +static int mdev_match(struct device *dev, struct device_driver *drv= ) > > >> +{ > > >> +=09unsigned int i; > > >> +=09struct mdev_device *mdev =3D to_mdev_device(dev); > > >> +=09struct mdev_driver *mdrv =3D to_mdev_driver(drv); > > >> +=09const struct mdev_class_id *ids =3D mdrv->id_table; > > >> + =20 > > > Nit, as we start to allow new mdev bus drivers, mdev-core might want = to > > > protect itself from a NULL id_table, by either failing the > > > mdev_register_driver() or failing the match here. I think such a > > > condition would segfault as written here, but clearly we don't have > > > such external drivers yet. Thanks, =20 > >=20 > >=20 > > I'm not sure I get the point here. My understanding is that mdev-core= =20 > > won't try to be matched here since it was not a complete mdev device. = =20 >=20 > The parent driver failing to set a type vs the parent driver failing to Correction, the second half of this should be in reference to the mdev bus driver. > register with a struct mdev_driver where id_table is not null are > different issues. I agree that if a vendor driver was not updated for > this series that they'd never successfully create a device because the > mdev-core would reject it for not setting a class, but mdev_match() is > called for devices that might be created by other vendor drivers, so > loading a parent driver with a null id_table potentially breaks > matching for everyone. Thanks, The point is still valid though, for example if vfio-mdev registered with a null id_table it would break matching for virtio-mdev depending on the order we iterate through drivers as we call mdev_match(). Thanks, Alex From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: Re: [PATCH V5 1/6] mdev: class id support Date: Thu, 24 Oct 2019 14:13:30 -0600 Message-ID: <20191024141330.017a6480@x1.home> References: <20191023130752.18980-1-jasowang@redhat.com> <20191023130752.18980-2-jasowang@redhat.com> <20191023154204.31d74866@x1.home> <38bdf762-524a-e0f1-6e9a-1102adfe8fb1@redhat.com> <20191024134636.253131c5@x1.home> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191024134636.253131c5@x1.home> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Jason Wang Cc: stefanha@redhat.com, christophe.de.dinechin@gmail.com, kvm@vger.kernel.org, mst@redhat.com, airlied@linux.ie, joonas.lahtinen@linux.intel.com, heiko.carstens@de.ibm.com, dri-devel@lists.freedesktop.org, 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smtp.corp.redhat.com (Postfix) with ESMTP id 971AE4530; Thu, 24 Oct 2019 20:13:31 +0000 (UTC) Date: Thu, 24 Oct 2019 14:13:30 -0600 From: Alex Williamson To: Jason Wang Message-ID: <20191024141330.017a6480@x1.home> In-Reply-To: <20191024134636.253131c5@x1.home> References: <20191023130752.18980-1-jasowang@redhat.com> <20191023130752.18980-2-jasowang@redhat.com> <20191023154204.31d74866@x1.home> <38bdf762-524a-e0f1-6e9a-1102adfe8fb1@redhat.com> <20191024134636.253131c5@x1.home> Organization: Red Hat MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: 5KVeD95sOy2OSN9aLjwQqQ-1 X-Mimecast-Spam-Score: 0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571948035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4okx/0WuIUvMfg3eEWnxYk0ixrLOf5XkOoO4HYGvUSc=; b=gnblgy+Oim8yeE9fuUv2Ki0Y65CPffDYOupE2sjt+/I4PuCS8lPNJBajn2T3aOA849fWfb TTU5AfIR7CPM1BmuXs8zBwSmhTZ+0Sb0quT83n8YU+md3TYDGRr4/N3Uyvisw62i3kJH5V ekewpYQxVU8Ct5hPD4yeutEvREGH7r4= Subject: Re: [Intel-gfx] [PATCH V5 1/6] mdev: class id support X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stefanha@redhat.com, christophe.de.dinechin@gmail.com, kvm@vger.kernel.org, mst@redhat.com, airlied@linux.ie, heiko.carstens@de.ibm.com, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, kwankhede@nvidia.com, rob.miller@broadcom.com, linux-s390@vger.kernel.org, sebott@linux.ibm.com, lulu@redhat.com, eperezma@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, haotian.wang@sifive.com, cunming.liang@intel.com, farman@linux.ibm.com, 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