Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966106AbcKOPcL (ORCPT ); Tue, 15 Nov 2016 10:32:11 -0500 Received: from hqemgate14.nvidia.com ([216.228.121.143]:10903 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755451AbcKOP3n (ORCPT ); Tue, 15 Nov 2016 10:29:43 -0500 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Mon, 14 Nov 2016 19:28:44 -0800 From: Kirti Wankhede To: , , , CC: , , , , , , Kirti Wankhede Subject: [PATCH v13 12/22] vfio: Add notifier callback to parent's ops structure of mdev Date: Tue, 15 Nov 2016 20:59:55 +0530 Message-ID: <1479223805-22895-13-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1479223805-22895-1-git-send-email-kwankhede@nvidia.com> References: <1479223805-22895-1-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: 3205 Lines: 99 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 | 25 ++++++++++++++++++++++++- include/linux/mdev.h | 9 +++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index ffc36758cb84..4fc63db38829 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; @@ -36,9 +45,18 @@ static int vfio_mdev_open(void *device_data) if (!try_module_get(THIS_MODULE)) return -ENODEV; + 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"); + } + ret = parent->ops->open(mdev); - if (ret) + if (ret) { + if (likely(parent->ops->notifier)) + vfio_unregister_notifier(&mdev->dev, &mdev->nb); module_put(THIS_MODULE); + } return ret; } @@ -51,6 +69,11 @@ static void vfio_mdev_release(void *device_data) if (likely(parent->ops->release)) parent->ops->release(mdev); + if (likely(parent->ops->notifier)) { + if (vfio_unregister_notifier(&mdev->dev, &mdev->nb)) + pr_err("Failed to unregister notifier for mdev\n"); + } + module_put(THIS_MODULE); } diff --git a/include/linux/mdev.h b/include/linux/mdev.h index ec819e9a115a..94c43034c297 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; }; /** @@ -85,6 +86,12 @@ struct mdev_device { * @mmap: mmap callback * @mdev: mediated device structure * @vma: vma structure + * @notifer: Notifier callback, currently only for + * VFIO_IOMMU_NOTIFY_DMA_UNMAP action notified duing + * DMA_UNMAP call on mapped iova range. + * @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. **/ @@ -106,6 +113,8 @@ 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