From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: Re: [PATCH V7 1/6] mdev: class id support Date: Mon, 4 Nov 2019 14:50:02 -0700 Message-ID: <20191104145002.4dfed0c4@x1.home> References: <20191104123952.17276-1-jasowang@redhat.com> <20191104123952.17276-2-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20191104123952.17276-2-jasowang@redhat.com> Sender: netdev-owner@vger.kernel.org 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 List-Id: dri-devel@lists.freedesktop.org On Mon, 4 Nov 2019 20:39:47 +0800 Jason Wang wrote: > 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. >=20 > So this patch adds id_table to mdev_driver and class_id for mdev > device with the match method for mdev bus. >=20 > Reviewed-by: Parav Pandit > 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 | 16 ++++++++++++ > drivers/vfio/mdev/mdev_driver.c | 25 +++++++++++++++++++ > 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, 75 insertions(+) >=20 > diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Document= ation/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 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 { > =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 function= calls > @@ -170,6 +172,9 @@ that a driver should use to unregister itself with th= e 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 through= :: > + > +=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 *kobj, st= ruct 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 *kobj, = 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..d23ca39e3be6 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, void *= data) > } > EXPORT_SYMBOL(mdev_set_drvdata); > =20 > +/* Specify the class for the mdev device, this must be called during > + * create() callback. > + */ Standard non-networking multi-line comment style please, ie. /* * Multi- * line * comment */ Thanks, Alex > +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; > @@ -324,6 +334,12 @@ int mdev_device_create(struct kobject *kobj, > =09if (ret) > =09=09goto ops_create_fail; > =20 > +=09if (!mdev->class_id) { > +=09=09ret =3D -EINVAL; > +=09=09dev_warn(dev, "mdev vendor driver failed to specify device class\n= "); > +=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/mdev_dri= ver.c > index 0d3223aee20b..ed06433693e8 100644 > --- a/drivers/vfio/mdev/mdev_driver.c > +++ b/drivers/vfio/mdev/mdev_driver.c > @@ -69,8 +69,33 @@ 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; > + > +=09if (!ids) > +=09=09return 0; > + > +=09for (i =3D 0; ids[i].id; i++) > +=09=09if (ids[i].id =3D=3D mdev->class_id) > +=09=09=09return 1; > +=09return 0; > +} > + > +static int mdev_uevent(struct device *dev, struct kobj_uevent_env *env) > +{ > +=09struct mdev_device *mdev =3D to_mdev_device(dev); > + > +=09return add_uevent_var(env, "MODALIAS=3Dmdev:c%02X", mdev->class_id); > +} > + > struct bus_type mdev_bus_type =3D { > =09.name=09=09=3D "mdev", > +=09.match=09=09=3D mdev_match, > +=09.uevent=09=09=3D mdev_uevent, > =09.probe=09=09=3D mdev_probe, > =09.remove=09=09=3D mdev_remove, > }; > diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_pr= ivate.h > index 7d922950caaf..c65f436c1869 100644 > --- a/drivers/vfio/mdev/mdev_private.h > +++ b/drivers/vfio/mdev/mdev_private.h > @@ -33,6 +33,7 @@ struct mdev_device { > =09struct kobject *type_kobj; > =09struct device *iommu_device; > =09bool active; > +=09u16 class_id; > }; > =20 > #define to_mdev_device(dev)=09container_of(dev, struct mdev_device, dev) > diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.= c > index 30964a4e0a28..38431e9ef7f5 100644 > --- a/drivers/vfio/mdev/vfio_mdev.c > +++ b/drivers/vfio/mdev/vfio_mdev.c > @@ -120,10 +120,16 @@ static void vfio_mdev_remove(struct device *dev) > =09vfio_del_group_dev(dev); > } > =20 > +static const struct mdev_class_id vfio_id_table[] =3D { > +=09{ MDEV_CLASS_ID_VFIO }, > +=09{ 0 }, > +}; > + > static struct mdev_driver vfio_mdev_driver =3D { > =09.name=09=3D "vfio_mdev", > =09.probe=09=3D vfio_mdev_probe, > =09.remove=09=3D vfio_mdev_remove, > +=09.id_table =3D vfio_id_table, > }; > =20 > static int __init vfio_mdev_init(void) > diff --git a/include/linux/mdev.h b/include/linux/mdev.h > index 0ce30ca78db0..78b69d09eb54 100644 > --- a/include/linux/mdev.h > +++ b/include/linux/mdev.h > @@ -118,6 +118,7 @@ struct mdev_type_attribute mdev_type_attr_##_name =3D= =09=09\ > * @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 { > @@ -125,6 +126,7 @@ struct mdev_driver { > =09int (*probe)(struct device *dev); > =09void (*remove)(struct device *dev); > =09struct device_driver driver; > +=09const struct mdev_class_id *id_table; > }; > =20 > #define to_mdev_driver(drv)=09container_of(drv, struct mdev_driver, driv= er) > @@ -132,6 +134,7 @@ struct mdev_driver { > void *mdev_get_drvdata(struct mdev_device *mdev); > void mdev_set_drvdata(struct mdev_device *mdev, void *data); > const guid_t *mdev_uuid(struct mdev_device *mdev); > +void mdev_set_class(struct mdev_device *mdev, u16 id); > =20 > extern struct bus_type mdev_bus_type; > =20 > @@ -145,4 +148,9 @@ struct device *mdev_parent_dev(struct mdev_device *md= ev); > struct device *mdev_dev(struct mdev_device *mdev); > struct mdev_device *mdev_from_dev(struct device *dev); > =20 > +enum { > +=09MDEV_CLASS_ID_VFIO =3D 1, > +=09/* New entries must be added here */ > +}; > + > #endif /* MDEV_H */ > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_deviceta= ble.h > index 5714fd35a83c..f32c6e44fb1a 100644 > --- a/include/linux/mod_devicetable.h > +++ b/include/linux/mod_devicetable.h > @@ -821,4 +821,12 @@ struct wmi_device_id { > =09const void *context; > }; > =20 > +/** > + * struct mdev_class_id - MDEV device class identifier > + * @id: Used to identify a specific class of device, e.g vfio-mdev devic= e. > + */ > +struct mdev_class_id { > +=09__u16 id; > +}; > + > #endif /* LINUX_MOD_DEVICETABLE_H */ > diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c > index ac5c8c17b1ff..115bc5074656 100644 > --- a/samples/vfio-mdev/mbochs.c > +++ b/samples/vfio-mdev/mbochs.c > @@ -561,6 +561,7 @@ static int mbochs_create(struct kobject *kobj, struct= mdev_device *mdev) > =09mbochs_reset(mdev); > =20 > =09mbochs_used_mbytes +=3D type->mbytes; > +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > =09return 0; > =20 > err_mem: > diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c > index cc86bf6566e4..665614574d50 100644 > --- a/samples/vfio-mdev/mdpy.c > +++ b/samples/vfio-mdev/mdpy.c > @@ -269,6 +269,7 @@ static int mdpy_create(struct kobject *kobj, struct m= dev_device *mdev) > =09mdpy_reset(mdev); > =20 > =09mdpy_count++; > +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > =09return 0; > } > =20 > diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c > index ce84a300a4da..90da12ff7fd9 100644 > --- a/samples/vfio-mdev/mtty.c > +++ b/samples/vfio-mdev/mtty.c > @@ -755,6 +755,7 @@ static int mtty_create(struct kobject *kobj, struct m= dev_device *mdev) > =09list_add(&mdev_state->next, &mdev_devices_list); > =09mutex_unlock(&mdev_list_lock); > =20 > +=09mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > =09return 0; > } > =20 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27D91CA9EC9 for ; Mon, 4 Nov 2019 21:50:41 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 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(int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 799DD1005500; Mon, 4 Nov 2019 21:50:29 +0000 (UTC) Received: from x1.home (ovpn-116-110.phx2.redhat.com [10.3.116.110]) by smtp.corp.redhat.com (Postfix) with ESMTP id 49CE85C1B2; Mon, 4 Nov 2019 21:50:03 +0000 (UTC) Date: Mon, 4 Nov 2019 14:50:02 -0700 From: Alex Williamson To: Jason Wang Subject: Re: [PATCH V7 1/6] mdev: class id support Message-ID: <20191104145002.4dfed0c4@x1.home> In-Reply-To: <20191104123952.17276-2-jasowang@redhat.com> References: <20191104123952.17276-1-jasowang@redhat.com> <20191104123952.17276-2-jasowang@redhat.com> Organization: Red Hat MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: AO8n43n_Nrq6fre6MQDThg-1 X-Mimecast-Spam-Score: 0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; 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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, zhi.a.wang@intel.com, farman@linux.ibm.com, idos@mellanox.com, gor@linux.ibm.com, intel-gfx@lists.freedesktop.org, rodrigo.vivi@intel.com, xiao.w.wang@intel.com, freude@linux.ibm.com, parav@mellanox.com, zhihong.wang@intel.com, intel-gvt-dev@lists.freedesktop.org, akrowiak@linux.ibm.com, oberpar@linux.ibm.com, tiwei.bie@intel.com, netdev@vger.kernel.org, cohuck@redhat.com, linux-kernel@vger.kernel.org, maxime.coquelin@redhat.com, lingshan.zhu@intel.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191104215002.WOl29rBPELDWZ8n8FI7n5lTsNKO0MepxEJj1Iyocdrk@z> T24gTW9uLCAgNCBOb3YgMjAxOSAyMDozOTo0NyArMDgwMApKYXNvbiBXYW5nIDxqYXNvd2FuZ0By 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