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Much of mdev_parent_ops becomes unused in this mode: - create()/remove() are done via the mdev_driver probe()/remove() - mdev_attr_groups becomes mdev_driver driver.dev_groups - Wrapper function callbacks are replaced with the same ones from struct vfio_device_ops Signed-off-by: Jason Gunthorpe --- drivers/vfio/mdev/mdev_core.c | 30 ++++++++++++++++++++++-------- drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++ include/linux/mdev.h | 2 ++ 3 files changed, 34 insertions(+), 8 deletions(-) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index ff8c1a84516698..e4581ec093a6a6 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -94,9 +94,11 @@ static void mdev_device_remove_common(struct mdev_device *mdev) mdev_remove_sysfs_files(mdev); device_del(&mdev->dev); lockdep_assert_held(&parent->unreg_sem); - ret = parent->ops->remove(mdev); - if (ret) - dev_err(&mdev->dev, "Remove failed: err=%d\n", ret); + if (parent->ops->remove) { + ret = parent->ops->remove(mdev); + if (ret) + dev_err(&mdev->dev, "Remove failed: err=%d\n", ret); + } /* Balances with device_initialize() */ put_device(&mdev->dev); @@ -127,7 +129,9 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops) char *envp[] = { env_string, NULL }; /* check for mandatory ops */ - if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups) + if (!ops || !ops->supported_type_groups) + return -EINVAL; + if (!ops->device_driver && (!ops->create || !ops->remove)) return -EINVAL; dev = get_device(dev); @@ -256,6 +260,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid) int ret; struct mdev_device *mdev, *tmp; struct mdev_parent *parent = type->parent; + struct mdev_driver *drv = parent->ops->device_driver; mutex_lock(&mdev_list_lock); @@ -296,14 +301,22 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid) goto out_put_device; } - ret = parent->ops->create(mdev); - if (ret) - goto out_unlock; + if (parent->ops->create) { + ret = parent->ops->create(mdev); + if (ret) + goto out_unlock; + } ret = device_add(&mdev->dev); if (ret) goto out_remove; + if (!drv) + drv = &vfio_mdev_driver; + ret = device_driver_attach(&drv->driver, &mdev->dev); + if (ret) + goto out_del; + ret = mdev_create_sysfs_files(mdev); if (ret) goto out_del; @@ -317,7 +330,8 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid) out_del: device_del(&mdev->dev); out_remove: - parent->ops->remove(mdev); + if (parent->ops->remove) + parent->ops->remove(mdev); out_unlock: up_read(&parent->unreg_sem); out_put_device: diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c index 041699571b7e55..c368ec824e2b5c 100644 --- a/drivers/vfio/mdev/mdev_driver.c +++ b/drivers/vfio/mdev/mdev_driver.c @@ -71,10 +71,20 @@ static int mdev_remove(struct device *dev) return 0; } +static int mdev_match(struct device *dev, struct device_driver *drv) +{ + /* + * No drivers automatically match. Drivers are only bound by explicit + * device_driver_attach() + */ + return 0; +} + struct bus_type mdev_bus_type = { .name = "mdev", .probe = mdev_probe, .remove = mdev_remove, + .match = mdev_match, }; EXPORT_SYMBOL_GPL(mdev_bus_type); diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 1fb34ea394ad46..3a38598c260559 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -55,6 +55,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype); * register the device to mdev module. * * @owner: The module owner. + * @device_driver: Which device driver to probe() on newly created devices * @dev_attr_groups: Attributes of the parent device. * @mdev_attr_groups: Attributes of the mediated device. * @supported_type_groups: Attributes to define supported types. It is mandatory @@ -103,6 +104,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype); **/ struct mdev_parent_ops { struct module *owner; + struct mdev_driver *device_driver; const struct attribute_group **dev_attr_groups; const struct attribute_group **mdev_attr_groups; struct attribute_group **supported_type_groups; -- 2.31.1