From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 871C2C04FF3 for ; Sat, 22 May 2021 00:22:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61C3761152 for ; Sat, 22 May 2021 00:22:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230349AbhEVAX5 (ORCPT ); Fri, 21 May 2021 20:23:57 -0400 Received: from mga09.intel.com ([134.134.136.24]:27110 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230478AbhEVAXM (ORCPT ); Fri, 21 May 2021 20:23:12 -0400 IronPort-SDR: 4lA4DYl3TTO9RPf0v5L5QiaWGOTxZBixkJKYwdJWrIm4osS0K8HpxPda6iBNKVjPWR0Yu+9H7h Z4laU5ucfnlA== X-IronPort-AV: E=McAfee;i="6200,9189,9991"; a="201634425" X-IronPort-AV: E=Sophos;i="5.82,319,1613462400"; d="scan'208";a="201634425" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2021 17:21:05 -0700 IronPort-SDR: C9TyUlnAuHhIlKxxo2Tnq56G+67p2ETA+MiqYq+SL80Q7Eryb088zy2NlZJpimmgJ33hd5cwmU U7cU4wJNypxg== X-IronPort-AV: E=Sophos;i="5.82,319,1613462400"; d="scan'208";a="441149772" Received: from djiang5-desk3.ch.intel.com ([143.182.136.137]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2021 17:21:03 -0700 Subject: [PATCH v6 19/20] vfio: mdev: Add device request interface From: Dave Jiang To: alex.williamson@redhat.com, kwankhede@nvidia.com, tglx@linutronix.de, vkoul@kernel.org, jgg@mellanox.com Cc: megha.dey@intel.com, jacob.jun.pan@intel.com, ashok.raj@intel.com, yi.l.liu@intel.com, baolu.lu@intel.com, kevin.tian@intel.com, sanjay.k.kumar@intel.com, tony.luck@intel.com, dan.j.williams@intel.com, eric.auger@redhat.com, pbonzini@redhat.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Date: Fri, 21 May 2021 17:21:03 -0700 Message-ID: <162164286322.261970.2647654897518928545.stgit@djiang5-desk3.ch.intel.com> In-Reply-To: <162164243591.261970.3439987543338120797.stgit@djiang5-desk3.ch.intel.com> References: <162164243591.261970.3439987543338120797.stgit@djiang5-desk3.ch.intel.com> User-Agent: StGit/0.23-29-ga622f1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Similar to commit 6140a8f56238 ("vfio-pci: Add device request interface"). Add request interface for mdev to allow userspace to opt in to receive a device request notification, indicating that the device should be released. Signed-off-by: Dave Jiang --- drivers/vfio/mdev/mdev_irqs.c | 23 +++++++++++++++++++++++ include/linux/mdev.h | 15 +++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/drivers/vfio/mdev/mdev_irqs.c b/drivers/vfio/mdev/mdev_irqs.c index ed2d11a7c729..11b1f8df020c 100644 --- a/drivers/vfio/mdev/mdev_irqs.c +++ b/drivers/vfio/mdev/mdev_irqs.c @@ -316,3 +316,26 @@ void mdev_irqs_free(struct mdev_device *mdev) memset(&mdev->mdev_irq, 0, sizeof(mdev->mdev_irq)); } EXPORT_SYMBOL_GPL(mdev_irqs_free); + +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count) +{ + struct device *dev = vdev->dev; + struct mdev_device *mdev = to_mdev_device(dev); + + if (mdev->req_trigger) { + dev_dbg(dev, "Requesting device from user\n"); + eventfd_signal(mdev->req_trigger, 1); + } +} +EXPORT_SYMBOL_GPL(vfio_mdev_request); + +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data) +{ + if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1) + return -EINVAL; + + return vfio_set_ctx_trigger_single(&mdev->req_trigger, count, flags, data); +} +EXPORT_SYMBOL_GPL(vfio_mdev_set_req_trigger); diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 035c021e8068..db73d58f5e81 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -11,6 +11,8 @@ #define MDEV_H #include +#include +#include struct mdev_type; @@ -38,6 +40,7 @@ struct mdev_device { struct device *iommu_device; struct mutex creation_lock; struct mdev_irq mdev_irq; + struct eventfd_ctx *req_trigger; }; static inline struct mdev_device *irq_to_mdev(struct mdev_irq *mdev_irq) @@ -131,6 +134,10 @@ void mdev_msix_send_signal(struct mdev_device *mdev, int vector); int mdev_irqs_init(struct mdev_device *mdev, int num, bool *ims_map); void mdev_irqs_free(struct mdev_device *mdev); void mdev_irqs_set_pasid(struct mdev_device *mdev, u32 pasid); +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count); +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data); #else static inline int mdev_set_msix_trigger(struct mdev_device *mdev, unsigned int index, unsigned int start, unsigned int count, u32 flags, @@ -148,6 +155,14 @@ static inline int mdev_irqs_init(struct mdev_device *mdev, int num, bool *ims_ma void mdev_irqs_free(struct mdev_device *mdev) {} void mdev_irqs_set_pasid(struct mdev_device *mdev, u32 pasid) {} +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count) {} + +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_VFIO_MDEV_IMS */ #endif /* MDEV_H */