From patchwork Thu Jul 29 07:34:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12407989 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=-14.0 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,UNWANTED_LANGUAGE_BODY, 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 35986C4338F for ; Thu, 29 Jul 2021 07:36:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EE1960241 for ; Thu, 29 Jul 2021 07:36:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235119AbhG2Hg0 (ORCPT ); Thu, 29 Jul 2021 03:36:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234874AbhG2HgW (ORCPT ); Thu, 29 Jul 2021 03:36:22 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CA6DC06179A for ; Thu, 29 Jul 2021 00:36:20 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id d17so5928655plh.10 for ; Thu, 29 Jul 2021 00:36:20 -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=VIBGZakN9k8BoO8YLMnCoI0EQ62bM67Edlzhv2usKjY=; b=YB4ZBkJ2UbGmacd15CUj5610iSRVIyAVm76CETlhwePaAGMy1nP4wVboLGC4DJ45kw wS034hRrqM5JbLcfYkHr4l64Vo3/J7EvtnF4ZFGz4XKOPCmyEorUa6O2v/DEV3nMMEBS u61bKP+sFu957CxpAsLhY0E5+ZnndnrsVtCqI36OjNoRLVQnERyMUuw0KViH6f22atFV UXjKMFPdgNpgcD4LFCaQHABx2iEsyXCpIIxTpPuUla8nJAobGV+MuufDJkoSesH1Nm60 n0AnQe+Eu0XBc/6JOLDRrzfVdrvAKRjfv4rTmabJC9d1ZMzG1tTMB2NX42dPf7u6CP2o +Eaw== 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=VIBGZakN9k8BoO8YLMnCoI0EQ62bM67Edlzhv2usKjY=; b=jd8r6S//ou9tCrnqnpR8uAufeunGgGyp5/aqoBEi8f3D4GDGAtfqKxInfw5FyrVlEk w3J8LUuYYl8ud8Zc3C/YWlZEGNw46EW5feVEofmGIHTHsTIRMzdkHUUdP/6hZAabRjGx p8glIiDI4myhxI1714J0rbStf+gwgjArw/vQJOdaXO0sugl1He7Q4HYfV0rUw7slWuG+ cgoMsavgmEegH4X7tXjDtTBP//6CtNuqlmltR9mRnQeZ8PmIxzqksAlYx1ammamCv2i4 9Evjtw3knjUVsmZI6Nq0XzH7dfLIAxWjRATrxgxtiyHJtLhwKG9vlkPfIwHkAEb0xgcX cdWQ== X-Gm-Message-State: AOAM5334rbPEyKIsW8nbdEMzPLdA9jMZzqkELgNj/u+t12g0vIUq4c0p 7MhUhwHijNK2LBrv8BSHtvzw X-Google-Smtp-Source: ABdhPJxTWwlUeqHVaW44eybtOYtbAcCrpe+XMQRRaXjatyWL8/OnDv5TWZQAFglLde0iZkvroMKDbQ== X-Received: by 2002:aa7:87cd:0:b029:32e:7954:2872 with SMTP id i13-20020aa787cd0000b029032e79542872mr3825545pfo.0.1627544179762; Thu, 29 Jul 2021 00:36:19 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id v15sm2469337pff.105.2021.07.29.00.36.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jul 2021 00:36:19 -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 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 v10 04/17] vdpa: Fail the vdpa_reset() if fail to set device status to zero Date: Thu, 29 Jul 2021 15:34:50 +0800 Message-Id: <20210729073503.187-5-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210729073503.187-1-xieyongji@bytedance.com> References: <20210729073503.187-1-xieyongji@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Re-read the device status to ensure it's set to zero during resetting. Otherwise, fail the vdpa_reset() after timeout. Signed-off-by: Xie Yongji --- include/linux/vdpa.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 406d53a606ac..d1a80ef05089 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -6,6 +6,7 @@ #include #include #include +#include /** * struct vdpa_calllback - vDPA callback definition. @@ -340,12 +341,24 @@ 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) +#define VDPA_RESET_TIMEOUT_MS 1000 + +static inline int vdpa_reset(struct vdpa_device *vdev) { const struct vdpa_config_ops *ops = vdev->config; + int timeout = 0; vdev->features_valid = false; ops->set_status(vdev, 0); + while (ops->get_status(vdev)) { + timeout += 20; + if (timeout > VDPA_RESET_TIMEOUT_MS) + return -EIO; + + msleep(20); + } + + return 0; } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)