Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761072AbcKDVNw (ORCPT ); Fri, 4 Nov 2016 17:13:52 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:9907 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934038AbcKDVKe (ORCPT ); Fri, 4 Nov 2016 17:10:34 -0400 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Fri, 04 Nov 2016 14:10:30 -0700 From: Kirti Wankhede To: , , , CC: , , , , , , Kirti Wankhede Subject: [PATCH v11 12/22] vfio: Add notifier callback to parent's ops structure of mdev Date: Sat, 5 Nov 2016 02:40:46 +0530 Message-ID: <1478293856-8191-13-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1478293856-8191-1-git-send-email-kwankhede@nvidia.com> References: <1478293856-8191-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2999 Lines: 91 Add a notifier calback to parent's ops structure of mdev device so that per device notifer for vfio module is registered through vfio_mdev module. Signed-off-by: Kirti Wankhede Signed-off-by: Neo Jia Change-Id: Iafa6f1721aecdd6e50eb93b153b5621e6d29b637 --- drivers/vfio/mdev/vfio_mdev.c | 19 +++++++++++++++++++ include/linux/mdev.h | 9 +++++++++ 2 files changed, 28 insertions(+) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index bb534d19e321..2b7c24aa9e46 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -24,6 +24,15 @@ #define DRIVER_AUTHOR "NVIDIA Corporation" #define DRIVER_DESC "VFIO based driver for Mediated device" +static int vfio_mdev_notifier(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct mdev_device *mdev = container_of(nb, struct mdev_device, nb); + struct parent_device *parent = mdev->parent; + + return parent->ops->notifier(mdev, action, data); +} + static int vfio_mdev_open(void *device_data) { struct mdev_device *mdev = device_data; @@ -40,6 +49,11 @@ static int vfio_mdev_open(void *device_data) if (ret) module_put(THIS_MODULE); + if (likely(parent->ops->notifier)) { + mdev->nb.notifier_call = vfio_mdev_notifier; + if (vfio_register_notifier(&mdev->dev, &mdev->nb)) + pr_err("Failed to register notifier for mdev\n"); + } return ret; } @@ -48,6 +62,11 @@ static void vfio_mdev_release(void *device_data) struct mdev_device *mdev = device_data; struct parent_device *parent = mdev->parent; + if (likely(parent->ops->notifier)) { + if (vfio_unregister_notifier(&mdev->dev, &mdev->nb)) + pr_err("Failed to unregister notifier for mdev\n"); + } + if (likely(parent->ops->release)) parent->ops->release(mdev); diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 0352febc1944..2999ef0ddaed 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -37,6 +37,7 @@ struct mdev_device { struct kref ref; struct list_head next; struct kobject *type_kobj; + struct notifier_block nb; }; @@ -84,6 +85,12 @@ struct mdev_device { * @cmd: mediated device structure * @arg: mediated device structure * @mmap: mmap callback + * @mdev: mediated device structure + * @vma: vma structure + * @notifer: Notifier callback + * @mdev: mediated device structure + * @action: Action for which notifier is called + * @data: Data associated with the notifier * Parent device that support mediated device should be registered with mdev * module with parent_ops structure. **/ @@ -105,6 +112,8 @@ struct parent_ops { ssize_t (*ioctl)(struct mdev_device *mdev, unsigned int cmd, unsigned long arg); int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); + int (*notifier)(struct mdev_device *mdev, unsigned long action, + void *data); }; /* interface for exporting mdev supported type attributes */ -- 2.7.0