From patchwork Tue May 5 08:46:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 186198 Delivered-To: patch@linaro.org Received: by 2002:a92:8d81:0:0:0:0:0 with SMTP id w1csp905050ill; Tue, 5 May 2020 01:47:16 -0700 (PDT) X-Google-Smtp-Source: APiQypL/L+vaFXzAExtc2EIhZ54gSvBekkFoi3tgi/0rHvYiCFyit5EIOVqZ6hWeptY2my22UD0J X-Received: by 2002:a17:902:163:: with SMTP id 90mr2133230plb.148.1588668435892; Tue, 05 May 2020 01:47:15 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1588668435; cv=none; d=google.com; s=arc-20160816; b=U4g6tA2y/7zR/obYZs40n6xDr0nzv4D9Lc6UJ6kFgdcSRPWMqelnsGwxcGte9xpQMb KOWq2HJBuKkBg/Tmz6ZXeU8pJzC7QHED3jH13a7BGU0sSjfDuXcr5kPxSeOf9goXrYHf IHODFgCh6RDfZMTGZhPBSRxfPCQhhdGd3oTquUqRzeTyyDfMFtqblxPF3doZYwDKwkqm gYNEWHqeCBW3ApbNMnk/BGkVCGDkDS0vjVgy27OfuJ9BAr8Au8p8dsiR+9hrg8UeXlwt /SXBkN/Ago8elV43HCLg62pG9ym2kKYwYyG1t/FaIEV40Nex4oGoUD0vQCHJTkzV51kl EjfQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:mime-version:cc :list-subscribe:list-help:list-post:list-archive:list-unsubscribe :list-id:precedence:references:cms-type:in-reply-to:message-id:date :subject:to:from:dkim-signature:dkim-filter:delivered-to; bh=xmtEOn/jsRz+/HVF/BwqAi0VdQirqErXHgk0bLNutwo=; b=wvJAkUROMjLKD/21/yqgIkecB4P0HJBF7W5MFCzOVWw/36LcWNsrsmFogW5JptZEyO H4xkNN9Z/E6JVJZEQnR6rbcqXV/O2x8V96SwkRHKdTV6hM2KO42TaWXPgMJY9DM8q5i9 YF4ETEQk1wdzJnmY0Td3eYeww6OUchOyWI07a0aWnnleybw6YdVmlmPNVWfSzYS7JjU4 Lpxr12tJqC9k/HuGHpxL2ixNTu6bStbcBjPoAbeKtXol1lbX+yws0D0DZ9rWZCriifVH rdbw7CBoAbat0DlMvq58Gpt/IoDyYrnVimS+Mj5flBNNj0g/Ag3slJV+YENF4REc2Fun +3vQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@samsung.com header.s=mail20170921 header.b=omkg7R3W; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=samsung.com Return-Path: Received: from gabe.freedesktop.org (gabe.freedesktop.org. [2610:10:20:722:a800:ff:fe36:1795]) by mx.google.com with ESMTPS id y6si845694plr.82.2020.05.05.01.47.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2020 01:47:15 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) client-ip=2610:10:20:722:a800:ff:fe36:1795; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@samsung.com header.s=mail20170921 header.b=omkg7R3W; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=samsung.com Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 204006E5B2; Tue, 5 May 2020 08:46:48 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mailout2.w1.samsung.com (mailout2.w1.samsung.com [210.118.77.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id 57F1C6E5A3 for ; Tue, 5 May 2020 08:46:41 +0000 (UTC) Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout2.w1.samsung.com (KnoxPortal) with ESMTP id 20200505084639euoutp02914472fc4f30fe17243ee81288f3c544~MFX3lYjFs2628726287euoutp02v for ; Tue, 5 May 2020 08:46:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w1.samsung.com 20200505084639euoutp02914472fc4f30fe17243ee81288f3c544~MFX3lYjFs2628726287euoutp02v DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1588668399; bh=TxE/6G1g28mmKh7hooUAC2aT+D+6azanETRBOwRYElg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=omkg7R3W/3Q2Bl+cb32xRIYW7VX/up76W1blrssWmzK4/YV9vkZmGlUAHrftdH/ky sBm3jWLZP1zBzJJT1oktuawgrGb+xZ++K3Cust+asUCXnN8sc9seby6u1Iz1mdAPcQ 6J8uGx4WXNmvPiCCXkEoHiF7i93T48TUIMuyi/8U= Received: from eusmges2new.samsung.com (unknown [203.254.199.244]) by eucas1p1.samsung.com (KnoxPortal) with ESMTP id 20200505084638eucas1p14d6b13af09eff6253e2019c1163d2ea3~MFX3YaiQa2425224252eucas1p1F; Tue, 5 May 2020 08:46:38 +0000 (GMT) Received: from eucas1p1.samsung.com ( [182.198.249.206]) by eusmges2new.samsung.com (EUCPMTA) with SMTP id 54.42.60679.EE721BE5; Tue, 5 May 2020 09:46:38 +0100 (BST) Received: from eusmtrp1.samsung.com (unknown [182.198.249.138]) by eucas1p2.samsung.com (KnoxPortal) with ESMTPA id 20200505084638eucas1p24f356b441a3589e9528d239c0b9ac666~MFX28WU0-1948219482eucas1p2b; Tue, 5 May 2020 08:46:38 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200505084638eusmtrp186bd6d7ec444ca0de6918ea0b42f52cb~MFX27rb8P0969409694eusmtrp1G; Tue, 5 May 2020 08:46:38 +0000 (GMT) X-AuditID: cbfec7f4-0e5ff7000001ed07-58-5eb127ee86c4 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id A1.24.08375.EE721BE5; Tue, 5 May 2020 09:46:38 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200505084637eusmtip174e6b9fe26a7b71a38ddfeb81a667898~MFX2aZfgP0580805808eusmtip1C; Tue, 5 May 2020 08:46:37 +0000 (GMT) From: Marek Szyprowski To: dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 24/25] samples: vfio-mdev/mbochs: fix common struct sg_table related issues Date: Tue, 5 May 2020 10:46:13 +0200 Message-Id: <20200505084614.30424-24-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200505084614.30424-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSa0hTYRjmO7edTSenafhhkTDIMEjTJA4YZuCPE4hFEYaVecqDl9y0zVku SmkosZx4KROvQzKvc9PUeSHU5TVBRMW0LJP5J2tecomZaZsH699ze9/n5eMjUUkb7kUmyFM5 hZxNkhIirH3w19iJ5WPN0ScLKvxp3dgIQjcXG3F6tz0fpad+rhB0XcMAQut7gumy53fp1tFy QNunFhC6xTqN05NdZQRt6P8koPtWF/FQMdNY0QiYNxt6jDFvfMGZ+adDCPP6ZQbzcceKMoUz NYDpns0kGJ1mmWByW+sBs95y5KJLlOhMLJeUkMYp/ENiRPGzVVlYitnt/nDZWzwT5LhqgZCE VBDMqm4mtEBESqhaADs2DbjTkFB2ALsqhbyxDuBW+ziyP/H5R72AN2oAzLUaMJ44JpqWnhHO FEEFQK1Nu4c9qCwAh3WuzhBKTSPQ9md5r8OdioH2ueo9jFFHoeZ3EebEYioEduvacL7OGzaY elEnFjp068Tc3rGQGhTAfsuM4w7SQcJg7bKKz7vDpaFWAY8Pw9HCHIzPawBcGDMIeJID4OTj YsCnguHc2BbhXIRSvtDY5c/L56B2Y5Lg97vBGdsBp4w6YEH7C5SXxfBJtoRP+8CSoaZ/tX3j EyiPGdihK0f4BxoA8FvnNp4HvEv+l+kBqAeenEopi+OUgXLunp+SlSlV8ji/28myFuD4TKM7 Q/YO0LV9ywIoEkhdxVfXjdESnE1TpsssAJKo1EP8atMULRHHsulqTpF8U6FK4pQWcIjEpJ7i U1Vfb0ioODaVu8NxKZxi30VIoVcmuD59xdOXuyDUtLi72gK9Dk7YXUJDdksLY2cNlS+ljfLz a8YPrCg/rzCMLE3vaauJnI84PZzNvFttCnp4afOyLUKv3vierk40g7pJtQaPmusuD/fpdFs0 XRsxv1eZM4rid1WayhnfLWO1XZIYzvaeHX2wsiZzMyVK4aOiyEgppoxnA46jCiX7Fz5EzGxI AwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOIsWRmVeSWpSXmKPExsVy+t/xu7rv1DfGGey5L2jRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9tMWdqocWW03MZLb5cechksenxNVaLy7vmsFmsPXKX3eLg hyesDrwea+atYfTY+20Bi8f2bw9YPe53H2fy2Lyk3uP2v8fMHpNvLGf02H2zgc2jt/kdm0ff llWMHp83yQVwR+nZFOWXlqQqZOQXl9gqRRtaGOkZWlroGZlY6hkam8daGZkq6dvZpKTmZJal FunbJehl3FzUylKwna/ixJzDrA2MPTxdjJwcEgImEvc+rWLvYuTiEBJYyiix//ouFoiEjMTJ aQ2sELawxJ9rXWwQRZ8YJR6f/whWxCZgKNH1FiIhItDJKDGt+yM7SIJZ4B6TxN51fiC2sECc xNrNcxlBbBYBVYnm39PAmnkF7CR2926F2iAvsXrDAWYQmxMo/vjSHTYQW0igUOLD+e+sExj5 FjAyrGIUSS0tzk3PLTbUK07MLS7NS9dLzs/dxAiMlG3Hfm7ewXhpY/AhRgEORiUe3ojP6+OE WBPLiitzDzFKcDArifAu+7EhTog3JbGyKrUoP76oNCe1+BCjKdBRE5mlRJPzgVGcVxJvaGpo bmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qB0WDZBFGvy0efej3/vNFwUvnq 7Y+P9t25sOyPjaDdzg/1fZuuaMVvUF+4KkRLeLIi5+sLf9/O2pJYzcG2yXqzaPG561YH8sIS NuxL+OLNGrR760KPOes3HzKO4fEpKTeN2Za65cTOG4vi7GYL2K1Yv7u5N4dpuUzs+Y6jqd9f fjj96Kcd58uVivOUWIozEg21mIuKEwHQUyHvqgIAAA== X-CMS-MailID: 20200505084638eucas1p24f356b441a3589e9528d239c0b9ac666 X-Msg-Generator: CA X-RootMTR: 20200505084638eucas1p24f356b441a3589e9528d239c0b9ac666 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200505084638eucas1p24f356b441a3589e9528d239c0b9ac666 References: <20200505083926.28503-1-m.szyprowski@samsung.com> <20200505084614.30424-1-m.szyprowski@samsung.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, Bartlomiej Zolnierkiewicz , David Airlie , Kirti Wankhede , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The Documentation/DMA-API-HOWTO.txt states that dma_map_sg returns the numer of the created entries in the DMA address space. However the subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be called with the original number of the entries passed to dma_map_sg. The sg_table->nents in turn holds the result of the dma_map_sg call as stated in include/linux/scatterlist.h. A common mistake was to ignore a result of the dma_map_sg function and don't use the sg_table->orig_nents at all. To avoid such issues, lets use common dma-mapping wrappers operating directly on the struct sg_table objects and adjust references to the nents and orig_nents respectively. While touching this code, also add missing call to dma_unmap_sgtable. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v3 00/25] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/5/187 --- samples/vfio-mdev/mbochs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index 3cc5e59..f2c62e0 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -846,7 +846,7 @@ static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 0, dmabuf->mode.size, GFP_KERNEL) < 0) goto err2; - if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction)) + if (dma_map_sgtable(at->dev, sg, direction)) goto err3; return sg; @@ -868,6 +868,7 @@ static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); + dma_unmap_sgtable(at->dev, sg, direction); sg_free_table(sg); kfree(sg); }