From patchwork Wed Aug 18 12:06:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444201 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 76ABBC432BE for ; Wed, 18 Aug 2021 12:08:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6114E610E8 for ; Wed, 18 Aug 2021 12:08:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237032AbhHRMJJ (ORCPT ); Wed, 18 Aug 2021 08:09:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236729AbhHRMI4 (ORCPT ); Wed, 18 Aug 2021 08:08:56 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA265C0612A7 for ; Wed, 18 Aug 2021 05:08:00 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id e7so2006662pgk.2 for ; Wed, 18 Aug 2021 05:08:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=h3cBaHMfU52s7B4IKQZfv/Mv4AwRAWrj25gFgUhSo0U=; b=BSEezFXK8s9mIq1KmFaXULVeK3aSeyUogMR5eD4dSvtorIgyvtWBSxykWIDi2Mf8pr X5b162/G8WPmPUAGFLqIwL0ckm9Ys6EESEOmKMZOP0yUwunUWxu3972h2sop/3olzLJy +IddzNhjRBi9dNG9AR0ALhnxsPULvsgdBtWjeyQNb90yCiAG9ofU/B/rl//+ZPKJ4xvC +dt5yiC6AAS7EhGnuWJ7Q9BYkTy7pDDvx8baBuxDEgJnKxcO7qGyGDW7avh8GUwYddOo 33vORXAaeWGUY3lf7K8R+UkAVom11YqRB/1UwDF/3jh8VGWc6YZBRKuzp3zS4SAgt24N IbFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=h3cBaHMfU52s7B4IKQZfv/Mv4AwRAWrj25gFgUhSo0U=; b=pl0CdJS8wsR+8CG62LTMOKNyxx54vGUz99s2FTSHJetFvwLW7ZeX4GFs+8aqnikAau cONXUdvlUK9WSlbEmc1ICY5B+bzqliv9UbFn1mkhdMmaD1ESlaVfUGnwzmzxhDBDopcQ 3RAnDXXkRQTyDITHyGG5qp4alQiOaamzb65o8RK046QCMaPb1MFjl1yR892YbSLmtU+L LtD3W8sWLB91r+9dhVobTXNB5HYvO4fGKQS98FH/Hyke3ZG2nNJYzrzvM++yZrKhrwAO ERZWTe6Wkii1bY6SPB84o6ROdf8iaSTaSpjQ5GTTB6SYwehpufey3dtv5dqZgWmZccQY v9Vw== X-Gm-Message-State: AOAM533Hq/49dIidAVfr+cWIVq/peFReDBCeKamjCc42vEgNrtt/aQC+ +4KwLUpNeD9Ya7R9XDk1pfLq X-Google-Smtp-Source: ABdhPJylpJBebPvrUUXvngWerpOz2/KsXpZmy7xMNWLgfzpdybMKiIoAmHmo7Y5tBNvbw/zln+2/Kg== X-Received: by 2002:a62:e90b:0:b029:30e:4530:8dca with SMTP id j11-20020a62e90b0000b029030e45308dcamr9110885pfh.17.1629288480323; Wed, 18 Aug 2021 05:08:00 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id 73sm6785078pfz.73.2021.08.18.05.07.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:07:59 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com, joro@8bytes.org, gregkh@linuxfoundation.org, zhe.he@windriver.com, xiaodong.liu@intel.com, joe@perches.com, robin.murphy@arm.com Cc: songmuchun@bytedance.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v11 04/12] vdpa: Add reset callback in vdpa_config_ops Date: Wed, 18 Aug 2021 20:06:34 +0800 Message-Id: <20210818120642.165-5-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210818120642.165-1-xieyongji@bytedance.com> References: <20210818120642.165-1-xieyongji@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds a new callback to support device specific reset behavior. The vdpa bus driver will call the reset function instead of setting status to zero during resetting if device driver supports the new callback. Signed-off-by: Xie Yongji --- drivers/vhost/vdpa.c | 9 +++++++-- include/linux/vdpa.h | 11 ++++++++++- 2 files changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index b07aa161f7ad..b1c91b4db0ba 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -157,7 +157,7 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; u8 status, status_old; - int nvqs = v->nvqs; + int ret, nvqs = v->nvqs; u16 i; if (copy_from_user(&status, statusp, sizeof(status))) @@ -172,7 +172,12 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) if (status != 0 && (ops->get_status(vdpa) & ~status) != 0) return -EINVAL; - ops->set_status(vdpa, status); + if (status == 0 && ops->reset) { + ret = ops->reset(vdpa); + if (ret) + return ret; + } else + ops->set_status(vdpa, status); if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) for (i = 0; i < nvqs; i++) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 8a645f8f4476..af7ea5ad795f 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -196,6 +196,9 @@ struct vdpa_iova_range { * @vdev: vdpa device * Returns the iova range supported by * the device. + * @reset: Reset device (optional) + * @vdev: vdpa device + * Returns integer: success (0) or error (< 0) * @set_map: Set device memory mapping (optional) * Needed for device that using device * specific DMA translation (on-chip IOMMU) @@ -263,6 +266,7 @@ struct vdpa_config_ops { const void *buf, unsigned int len); u32 (*get_generation)(struct vdpa_device *vdev); struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev); + int (*reset)(struct vdpa_device *vdev); /* DMA ops */ int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb); @@ -351,12 +355,17 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) return vdev->dma_dev; } -static inline void vdpa_reset(struct vdpa_device *vdev) +static inline int vdpa_reset(struct vdpa_device *vdev) { const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = false; + if (ops->reset) + return ops->reset(vdev); + ops->set_status(vdev, 0); + + return 0; } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)