> From: Jason Wang > Sent: Thursday, September 12, 2019 5:40 PM > > Mdev bus only support vfio driver right now, so it doesn't implement > match method. But in the future, we may add drivers other than vfio, > one example is virtio-mdev[1] driver. This means we need to add device > id support in bus match method to pair the mdev device and mdev driver > correctly. "device id" sound a bit confusing to me - it usually means something unique to each device, while here it is used to indicate expected driver types (vfio, virtio, etc.). but using "bus id" is also not good - we have only one mdev bus here. Then what about "class id"? > > So this patch add id_table to mdev_driver and id for mdev parent, and > implement the match method for mdev bus. > > [1] https://lkml.org/lkml/2019/9/10/135 > > Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> > --- > drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +- > drivers/s390/cio/vfio_ccw_ops.c | 2 +- > drivers/s390/crypto/vfio_ap_ops.c | 3 ++- > drivers/vfio/mdev/mdev_core.c | 14 ++++++++++++-- > 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 | 6 +++++- > include/linux/mod_devicetable.h | 6 ++++++ > samples/vfio-mdev/mbochs.c | 2 +- > samples/vfio-mdev/mdpy.c | 2 +- > samples/vfio-mdev/mtty.c | 2 +- > 12 files changed, 51 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c > b/drivers/gpu/drm/i915/gvt/kvmgt.c > index 23aa3e50cbf8..19d51a35f019 100644 > --- a/drivers/gpu/drm/i915/gvt/kvmgt.c > +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c > @@ -1625,7 +1625,7 @@ static int kvmgt_host_init(struct device *dev, void > *gvt, const void *ops) > return -EFAULT; > intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups; > > - return mdev_register_device(dev, &intel_vgpu_ops); > + return mdev_register_vfio_device(dev, &intel_vgpu_ops); > } > > static void kvmgt_host_exit(struct device *dev) > diff --git a/drivers/s390/cio/vfio_ccw_ops.c > b/drivers/s390/cio/vfio_ccw_ops.c > index 5eb61116ca6f..f87d9409e290 100644 > --- a/drivers/s390/cio/vfio_ccw_ops.c > +++ b/drivers/s390/cio/vfio_ccw_ops.c > @@ -578,7 +578,7 @@ static const struct mdev_parent_ops > vfio_ccw_mdev_ops = { > > int vfio_ccw_mdev_reg(struct subchannel *sch) > { > - return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); > + return mdev_register_vfio_device(&sch->dev, > &vfio_ccw_mdev_ops); > } > > void vfio_ccw_mdev_unreg(struct subchannel *sch) > diff --git a/drivers/s390/crypto/vfio_ap_ops.c > b/drivers/s390/crypto/vfio_ap_ops.c > index 0604b49a4d32..eacbde3c7a97 100644 > --- a/drivers/s390/crypto/vfio_ap_ops.c > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -1295,7 +1295,8 @@ int vfio_ap_mdev_register(void) > { > atomic_set(&matrix_dev->available_instances, > MAX_ZDEV_ENTRIES_EXT); > > - return mdev_register_device(&matrix_dev->device, > &vfio_ap_matrix_ops); > + return mdev_register_vfio_device(&matrix_dev->device, > + &vfio_ap_matrix_ops); > } > > void vfio_ap_mdev_unregister(void) > diff --git a/drivers/vfio/mdev/mdev_core.c > b/drivers/vfio/mdev/mdev_core.c > index b558d4cfd082..fc07ff3ebe96 100644 > --- a/drivers/vfio/mdev/mdev_core.c > +++ b/drivers/vfio/mdev/mdev_core.c > @@ -135,11 +135,14 @@ 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. > * > * Add device to list of registered parent devices. > * Returns a negative value on error, otherwise 0. > */ > -int mdev_register_device(struct device *dev, const struct > mdev_parent_ops *ops) > +int mdev_register_device(struct device *dev, > + const struct mdev_parent_ops *ops, > + u8 id) > { > int ret; > struct mdev_parent *parent; > @@ -175,6 +178,7 @@ int mdev_register_device(struct device *dev, const > struct mdev_parent_ops *ops) > > parent->dev = dev; > parent->ops = ops; > + parent->device_id = id; > > if (!mdev_bus_compat_class) { > mdev_bus_compat_class = > class_compat_register("mdev_bus"); > @@ -208,7 +212,13 @@ int mdev_register_device(struct device *dev, const > struct mdev_parent_ops *ops) > put_device(dev); > return ret; > } > -EXPORT_SYMBOL(mdev_register_device); > + > +int mdev_register_vfio_device(struct device *dev, > + const struct mdev_parent_ops *ops) > +{ > + return mdev_register_device(dev, ops, MDEV_ID_VFIO); > +} > +EXPORT_SYMBOL(mdev_register_vfio_device); > > /* > * mdev_unregister_device : Unregister a parent device > diff --git a/drivers/vfio/mdev/mdev_driver.c > b/drivers/vfio/mdev/mdev_driver.c > index 0d3223aee20b..fd5e9541d18e 100644 > --- a/drivers/vfio/mdev/mdev_driver.c > +++ b/drivers/vfio/mdev/mdev_driver.c > @@ -69,8 +69,22 @@ 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_device_id *ids = mdrv->id_table; > + > + for (i = 0; ids[i].id; i++) > + if (ids[i].id == mdev->parent->device_id) > + return 1; > + return 0; > +} > + > struct bus_type mdev_bus_type = { > .name = "mdev", > + .match = mdev_match, > .probe = mdev_probe, > .remove = mdev_remove, > }; > diff --git a/drivers/vfio/mdev/mdev_private.h > b/drivers/vfio/mdev/mdev_private.h > index 7d922950caaf..7fc8153671e0 100644 > --- a/drivers/vfio/mdev/mdev_private.h > +++ b/drivers/vfio/mdev/mdev_private.h > @@ -22,6 +22,7 @@ struct mdev_parent { > struct list_head type_list; > /* Synchronize device creation/removal with parent unregistration > */ > struct rw_semaphore unreg_sem; > + u8 device_id; > }; > > struct mdev_device { > diff --git a/drivers/vfio/mdev/vfio_mdev.c > b/drivers/vfio/mdev/vfio_mdev.c > index 30964a4e0a28..887c57f10880 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 struct mdev_device_id id_table[] = { > + { MDEV_ID_VFIO }, > + { 0 }, > +}; > + > static struct mdev_driver vfio_mdev_driver = { > .name = "vfio_mdev", > .probe = vfio_mdev_probe, > .remove = vfio_mdev_remove, > + .id_table = id_table, > }; > > static int __init vfio_mdev_init(void) > diff --git a/include/linux/mdev.h b/include/linux/mdev.h > index 0ce30ca78db0..f85045392120 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_device_id *id_table; > }; > > #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver) > @@ -135,7 +137,7 @@ const guid_t *mdev_uuid(struct mdev_device > *mdev); > > extern struct bus_type mdev_bus_type; > > -int mdev_register_device(struct device *dev, const struct > mdev_parent_ops *ops); > +int mdev_register_vfio_device(struct device *dev, const struct > mdev_parent_ops *ops); > void mdev_unregister_device(struct device *dev); > > int mdev_register_driver(struct mdev_driver *drv, struct module *owner); > @@ -145,4 +147,6 @@ 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); > > +#define MDEV_ID_VFIO 1 /* VFIO device */ > + > #endif /* MDEV_H */ > diff --git a/include/linux/mod_devicetable.h > b/include/linux/mod_devicetable.h > index 5714fd35a83c..f1fc143df042 100644 > --- a/include/linux/mod_devicetable.h > +++ b/include/linux/mod_devicetable.h > @@ -821,4 +821,10 @@ struct wmi_device_id { > const void *context; > }; > > +/* MDEV */ > + > +struct mdev_device_id { > + __u8 id; > +}; > + > #endif /* LINUX_MOD_DEVICETABLE_H */ > diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c > index ac5c8c17b1ff..71a4469be85d 100644 > --- a/samples/vfio-mdev/mbochs.c > +++ b/samples/vfio-mdev/mbochs.c > @@ -1468,7 +1468,7 @@ static int __init mbochs_dev_init(void) > if (ret) > goto failed2; > > - ret = mdev_register_device(&mbochs_dev, &mdev_fops); > + ret = mdev_register_vfio_device(&mbochs_dev, &mdev_fops); > if (ret) > goto failed3; > > diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c > index cc86bf6566e4..d3029dd27d91 100644 > --- a/samples/vfio-mdev/mdpy.c > +++ b/samples/vfio-mdev/mdpy.c > @@ -775,7 +775,7 @@ static int __init mdpy_dev_init(void) > if (ret) > goto failed2; > > - ret = mdev_register_device(&mdpy_dev, &mdev_fops); > + ret = mdev_register_vfio_device(&mdpy_dev, &mdev_fops); > if (ret) > goto failed3; > > diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c > index 92e770a06ea2..744c88a6b22c 100644 > --- a/samples/vfio-mdev/mtty.c > +++ b/samples/vfio-mdev/mtty.c > @@ -1468,7 +1468,7 @@ static int __init mtty_dev_init(void) > if (ret) > goto failed2; > > - ret = mdev_register_device(&mtty_dev.dev, &mdev_fops); > + ret = mdev_register_vfio_device(&mtty_dev.dev, &mdev_fops); > if (ret) > goto failed3; > > -- > 2.19.1 > > _______________________________________________ > intel-gvt-dev mailing list > intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev
