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__36194.3502373592$1572904255$gmane$org@x1.home> References: <20191104123952.17276-1-jasowang@redhat.com> <20191104123952.17276-2-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20191104123952.17276-2-jasowang@redhat.com> 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, 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, zhi.a.wang@intel.com, farman@linux.ibm.com, idos@mellanox.com, gor@linux.ibm.com, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, rodrigo.vivi@intel.com, xiao.w.wang@intel.com, freude@linux.ibm.com, zhenyuw@linux.intel.com, parav@mellanox.com, zhihong.wang@intel.com, intel-gvt-dev@lists.freedesktop.org, akrowiak@linux.ibm.com, oberpar@linux.ibm.com, netdev@vger.kernel.org, cohuck@redhat.com, linux-kernel@vger.ke List-Id: virtualization@lists.linuxfoundation.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. > > So this patch adds id_table to mdev_driver and class_id for mdev > device with the match method for mdev bus. > > 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(+) > > diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/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 { > 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 > @@ -170,6 +172,9 @@ that a driver should use to unregister itself with the mdev core driver:: > > extern void mdev_unregister_device(struct device *dev); > > +It is also required to specify the class_id in create() callback through:: > + > + int mdev_set_class(struct mdev_device *mdev, u16 id); > > Mediated Device Management Interface Through sysfs > ================================================== > 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, struct mdev_device *mdev) > dev_name(mdev_dev(mdev))); > ret = 0; > > + mdev_set_class(mdev, MDEV_CLASS_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..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) > private->sch->schid.ssid, > private->sch->schid.sch_no); > > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > return 0; > } > > 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) > list_add(&matrix_mdev->node, &matrix_dev->mdev_list); > mutex_unlock(&matrix_dev->lock); > > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > return 0; > } > > 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); > > +/* 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) > +{ > + WARN_ON(mdev->class_id); > + mdev->class_id = id; > +} > +EXPORT_SYMBOL(mdev_set_class); > + > struct device *mdev_dev(struct mdev_device *mdev) > { > return &mdev->dev; > @@ -324,6 +334,12 @@ int mdev_device_create(struct kobject *kobj, > if (ret) > goto ops_create_fail; > > + if (!mdev->class_id) { > + ret = -EINVAL; > + dev_warn(dev, "mdev vendor driver failed to specify device class\n"); > + goto add_fail; > + } > + > ret = device_add(&mdev->dev); > if (ret) > goto add_fail; > diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.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) > return 0; > } > > +static int mdev_match(struct device *dev, struct device_driver *drv) > +{ > + unsigned int i; > + struct mdev_device *mdev = to_mdev_device(dev); > + struct mdev_driver *mdrv = to_mdev_driver(drv); > + const struct mdev_class_id *ids = mdrv->id_table; > + > + if (!ids) > + return 0; > + > + for (i = 0; ids[i].id; i++) > + if (ids[i].id == mdev->class_id) > + return 1; > + return 0; > +} > + > +static int mdev_uevent(struct device *dev, struct kobj_uevent_env *env) > +{ > + struct mdev_device *mdev = to_mdev_device(dev); > + > + return add_uevent_var(env, "MODALIAS=mdev:c%02X", mdev->class_id); > +} > + > struct bus_type mdev_bus_type = { > .name = "mdev", > + .match = mdev_match, > + .uevent = mdev_uevent, > .probe = mdev_probe, > .remove = mdev_remove, > }; > diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.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 { > struct kobject *type_kobj; > struct device *iommu_device; > bool active; > + u16 class_id; > }; > > #define to_mdev_device(dev) container_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) > vfio_del_group_dev(dev); > } > > +static const struct mdev_class_id vfio_id_table[] = { > + { MDEV_CLASS_ID_VFIO }, > + { 0 }, > +}; > + > static struct mdev_driver vfio_mdev_driver = { > .name = "vfio_mdev", > .probe = vfio_mdev_probe, > .remove = vfio_mdev_remove, > + .id_table = vfio_id_table, > }; > > 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 = \ > * @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 { > int (*probe)(struct device *dev); > void (*remove)(struct device *dev); > struct device_driver driver; > + const struct mdev_class_id *id_table; > }; > > #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver) > @@ -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); > > extern struct bus_type mdev_bus_type; > > @@ -145,4 +148,9 @@ struct device *mdev_parent_dev(struct mdev_device *mdev); > struct device *mdev_dev(struct mdev_device *mdev); > struct mdev_device *mdev_from_dev(struct device *dev); > > +enum { > + MDEV_CLASS_ID_VFIO = 1, > + /* New entries must be added here */ > +}; > + > #endif /* MDEV_H */ > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.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 { > const void *context; > }; > > +/** > + * struct mdev_class_id - MDEV device class identifier > + * @id: Used to identify a specific class of device, e.g vfio-mdev device. > + */ > +struct mdev_class_id { > + __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) > mbochs_reset(mdev); > > mbochs_used_mbytes += type->mbytes; > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > return 0; > > 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 mdev_device *mdev) > mdpy_reset(mdev); > > mdpy_count++; > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > return 0; > } > > 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 mdev_device *mdev) > list_add(&mdev_state->next, &mdev_devices_list); > mutex_unlock(&mdev_list_lock); > > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > return 0; > } >