From patchwork Thu Feb 24 08:10:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12758002 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70619C433EF for ; Thu, 24 Feb 2022 08:13:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230311AbiBXIOF (ORCPT ); Thu, 24 Feb 2022 03:14:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231644AbiBXIM0 (ORCPT ); Thu, 24 Feb 2022 03:12:26 -0500 Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2CCBBB; Thu, 24 Feb 2022 00:11:38 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R951e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04357;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=34;SR=0;TI=SMTPD_---0V5NDoCU_1645690291; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0V5NDoCU_1645690291) by smtp.aliyun-inc.com(127.0.0.1); Thu, 24 Feb 2022 16:11:32 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: Jeff Dike , Richard Weinberger , Anton Ivanov , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Alexander Gordeev , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Johannes Berg , Vincent Whitchurch , Xuan Zhuo , linux-um@lists.infradead.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v6 14/26] virtio: add helper for queue reset Date: Thu, 24 Feb 2022 16:10:50 +0800 Message-Id: <20220224081102.80224-15-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220224081102.80224-1-xuanzhuo@linux.alibaba.com> References: <20220224081102.80224-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: bd1c915e263f Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add helper for virtio queue reset. * virtio_reset_vq(): reset a queue individually * virtio_enable_resetq(): enable a reset queue Signed-off-by: Xuan Zhuo --- include/linux/virtio_config.h | 40 +++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index d51906b1389f..0b81fbe17c85 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -230,6 +230,46 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, desc); } +/** + * virtio_reset_vq - reset a queue individually + * @vq: the virtqueue + * + * returns 0 on success or error status + * + * The api process of reset under normal circumstances: + * 1. virtio_reset_vq() - notify the device to reset the queue + * 2. virtqueue_detach_unused_buf() - recycle the buffer submitted + * 3. virtqueue_reset_vring() - reset the vring (may re-alloc) + * 4. virtio_enable_resetq() - mmap vring to device, and enable the queue + * + * Caller should guarantee that the vring is not accessed by any functions + * of virtqueue. + */ +static inline +int virtio_reset_vq(struct virtqueue *vq) +{ + if (!vq->vdev->config->reset_vq) + return -ENOENT; + + return vq->vdev->config->reset_vq(vq); +} + +/** + * virtio_enable_resetq - enable a reset queue + * @vq: the virtqueue + * + * returns 0 on success or error status + * + */ +static inline +int virtio_enable_resetq(struct virtqueue *vq) +{ + if (!vq->vdev->config->enable_reset_vq) + return -ENOENT; + + return vq->vdev->config->enable_reset_vq(vq); +} + /** * virtio_device_ready - enable vq use in probe function * @vdev: the device