From patchwork Tue May 12 09:00:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 11542683 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 44A3D912 for ; Tue, 12 May 2020 09:06:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 02BE2206A3 for ; Tue, 12 May 2020 09:06:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Gei71moB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="QTsmdUiI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 02BE2206A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=samsung.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=0n/nTFIg3GbO5bCh5OtvSmi/1unJG9kNdimavlXrtaY=; b=Gei71moBEg3NdfcpZdQyh3If2Y 7UKj1uko9Z6ahAMeB/mbGNMiyRjJpRXWg3bGnAQBxZDTON1QfruSkJVTUiAF/qChIRe0O+AL5mP8a 4SKyZVTYmlUA7I0GHdeYXEXkwsGzwId5HPeIQuWK5j4fW+Q6Tc0gtyKFJTZoUvGWABtS+51iWuHs/ pgfZ0EK8qeZp7FlWPnWaWDclxjxX6+z7PClcOjWEd8PRodvJkV3mRiP214+LkufIXda/AXrdGmJDm GSKn6SGpM8nyHfn2TuQKOV+0W5S7WpAsr/KsXy3p5CemhSQtQF4YECybQdN86xsCW/5GQ7AEtH58M 6yyOQe8g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYQra-0007OA-DP; Tue, 12 May 2020 09:06:10 +0000 Received: from mailout1.w1.samsung.com ([210.118.77.11]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYQms-0002DS-Me for linux-arm-kernel@lists.infradead.org; Tue, 12 May 2020 09:01:21 +0000 Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout1.w1.samsung.com (KnoxPortal) with ESMTP id 20200512090115euoutp016a167e2e2cc4c0c5f88b164ed58ff9dc~OPFnUl94-2629726297euoutp01N for ; Tue, 12 May 2020 09:01:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w1.samsung.com 20200512090115euoutp016a167e2e2cc4c0c5f88b164ed58ff9dc~OPFnUl94-2629726297euoutp01N DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1589274075; bh=H+PGsyjqkAzIq5fOyiAyZbqSQ8e5q8398iB2UvD4eqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QTsmdUiISAy2LGwECp6R47uAtsixPV8AyYRZkGI2jdruKRHtE9BPOHm6XlwHkVmOi MQaXUuIsvlfZgxYk58gE9gZuQkp/TDpP48yKSUEPMk7NbkUOOBous4PrkDhlvhJU+O H/bL/XpgIYUfcF9fRBT97POsv6DVA/YTMCI53muk= Received: from eusmges2new.samsung.com (unknown [203.254.199.244]) by eucas1p1.samsung.com (KnoxPortal) with ESMTP id 20200512090114eucas1p18f62a8c09947ee8e7518fcc04562ff72~OPFm5tgtS1182811828eucas1p13; Tue, 12 May 2020 09:01:14 +0000 (GMT) Received: from eucas1p1.samsung.com ( [182.198.249.206]) by eusmges2new.samsung.com (EUCPMTA) with SMTP id 24.22.60679.AD56ABE5; Tue, 12 May 2020 10:01:14 +0100 (BST) Received: from eusmtrp1.samsung.com (unknown [182.198.249.138]) by eucas1p1.samsung.com (KnoxPortal) with ESMTPA id 20200512090114eucas1p1917c16e0312cfb191f327e6dad2f7808~OPFmlxlpI1613916139eucas1p1Z; Tue, 12 May 2020 09:01:14 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200512090114eusmtrp188a412e3f27d35f0c87dc9c1712c2b1b~OPFmlB6no0183401834eusmtrp1e; Tue, 12 May 2020 09:01:14 +0000 (GMT) X-AuditID: cbfec7f4-0cbff7000001ed07-8f-5eba65da1b0d Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 74.F2.07950.AD56ABE5; Tue, 12 May 2020 10:01:14 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200512090113eusmtip195756e507e8573b43228078f6551a4ff~OPFl8aBFV1352513525eusmtip1G; Tue, 12 May 2020 09:01:13 +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 v4 12/38] drm: i915: fix common struct sg_table related issues Date: Tue, 12 May 2020 11:00:32 +0200 Message-Id: <20200512090058.14910-12-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200512090058.14910-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUwTURSGc2c60wGpjgXlBgVMEzSSyP4wCQTUGJ03MfHBkECtMBQCFNIB BF8kyKJlCUtkU7EWCLIUZBGwUJaylEIkCAQQJIBVIyBCBBEMQVsG5e0/3/3P/c+5uQQq7MPs iHBZLCOXSSJFuCWvZWBn5MIMowlyy1uwp7JGDAjVUFSPUX9aclFq4ucaTlXV9CPUk5wmhFJ2 eVOV4/WA0r5AqM2JRYRqNE5i1LjmKU6p++b4VM/6J4zqKpnkXzxG15bWAlq7peTRZR1LCN26 tYDRpYYb9HyGHqGbyu/Ts3tGlM6frgR0+/sknM5urgb0RqODv1WApU8IExkez8hdfW9bhrVV Z+MxY/YJhrV2LAkYoQJYEJD0gkW/slAFsCSE5EsAx9N7eVyxCWD/Si7GFRsArk9r+QpA7Lco O305Xglg4daPw47aymJgvhcn3aFiVYGbtQ2ZCuBglpXZhJJ9KBxTTu6brEl/WDb1bt/EI53g 9ngBYtYC0hfW9n9FuAEdYc2rbtSsLUx8/vnufhokZ/iwpiGbz5muwKpnfTxOW8NlffMBPw2H 8zMPGh4AuDii5nNFpmnV5CLAubzhh5HfuHk5lDwP6zWuHL4E976U49zOR+H06nEzRk0yr6UQ 5bAAPkwTcu6zsERf9z+2Z3QM5TQNtVPJB8/YD2B67yCSAxxLDsOUAFQDWyaOjZIyrIeMuevC SqLYOJnUJTg6qhGY/tbwnn6zDWh27+gASQCRlcDN7U2QEJPEs4lROgAJVGQjSAk3IUGIJPEe I48Wy+MiGVYHThE8ka3AU7UUKCSlklgmgmFiGPm/U4SwsEsCoR8XsOs2dbK5q5Q4OHCWdjzT 6aRaFn/bWeWL1alqCz3yOqPDeAKeMwQUD3ulND6KHz2pcu6aIQvCPMJaCwLeum77dpMbnyMu qz1Lb4VGRt88wiZIfRxWdMh3m8dDGj93VUWZXO5ncJ3gi4QqY9rOhDikuiI+6Jp7nW5oIFHE Y8Mk7s6onJX8BYgsda5XAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCIsWRmVeSWpSXmKPExsVy+t/xu7q3UnfFGVz/wGHRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlnMnrCZyWLBfmuL5ZfXM1rsXchk8eXKQyaLTY+vsVpc3jWHzWLt kbvsFgc/PGG12D/rGrsDv8eaeWsYPfZ+W8DisXjPSyaP7d8esHrMOxnocb/7OJPH5iX1Hrf/ PWb2mHxjOaPH7psNbB59W1YxenzeJBfAE6VnU5RfWpKqkJFfXGKrFG1oYaRnaGmhZ2RiqWdo bB5rZWSqpG9nk5Kak1mWWqRvl6CXsWNVH1vBJdmKk+93szYwPpboYuTgkBAwkViwz66LkYtD SGApo8T2Q1PYuhg5geIyEienNbBC2MISf651sUEUfWKU+HtiKSNIgk3AUKLrLURCRKCTUWJa 90d2kASzwBlmid8bvEFsYQE/iVvfLoJNYhFQlfhxeRoTiM0rYCex5ugLJogN8hKrNxxgBrE5 geL35/9hAbGFBAolHl19yzKBkW8BI8MqRpHU0uLc9NxiI73ixNzi0rx0veT83E2MwBjaduzn lh2MXe+CDzEKcDAq8fB2GO2ME2JNLCuuzD3EKMHBrCTC25IJFOJNSaysSi3Kjy8qzUktPsRo CnTURGYp0eR8YHznlcQbmhqaW1gamhubG5tZKInzdggcjBESSE8sSc1OTS1ILYLpY+LglGpg DOy+NMU8vu9gdcX1xnNCN1dl6NpaTVD4yl10QWT+M90Ijeq/N9f+WFjlJRh8S8zAdOKLuQ+9 2N+cFdssOGdu/F5/hf4fW02LFq7xd71/4tGn5qOqR2ceYnLyfvog54O3VFmPmtndzO/8Wfff 1RZbZE41ityTvOuu/q6NR7kmxjqwOpxXYGWdr8RSnJFoqMVcVJwIAEw6RT63AgAA X-CMS-MailID: 20200512090114eucas1p1917c16e0312cfb191f327e6dad2f7808 X-Msg-Generator: CA X-RootMTR: 20200512090114eucas1p1917c16e0312cfb191f327e6dad2f7808 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200512090114eucas1p1917c16e0312cfb191f327e6dad2f7808 References: <20200512085710.14688-1-m.szyprowski@samsung.com> <20200512090058.14910-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200512_020118_883124_C5F43967 X-CRM114-Status: GOOD ( 15.61 ) X-Spam-Score: -5.4 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-5.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.11 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.2 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bartlomiej Zolnierkiewicz , David Airlie , intel-gfx@lists.freedesktop.org, Joonas Lahtinen , Jani Nikula , Daniel Vetter , Rodrigo Vivi , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function returns the number of the created entries in the DMA address space. However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and dma_unmap_sg must be called with the original number of the entries passed to the dma_map_sg(). struct sg_table is a common structure used for describing a non-contiguous memory buffer, used commonly in the DRM and graphics subsystems. It consists of a scatterlist with memory pages and DMA addresses (sgl entry), as well as the number of scatterlist entries: CPU pages (orig_nents entry) and DMA mapped pages (nents entry). It turned out that it was a common mistake to misuse nents and orig_nents entries, calling DMA-mapping functions with a wrong number of entries or ignoring the number of mapped entries returned by the dma_map_sg() function. This driver creatively uses sg_table->orig_nents to store the size of the allocated scatterlist and ignores the number of the entries returned by dma_map_sg function. The sg_table->orig_nents is (mis)used to properly free the (over)allocated scatterlist. This patch only introduces the common DMA-mapping wrappers operating directly on the struct sg_table objects to the dmabuf related functions, so the other drivers, which might share buffers with i915 could rely on the properly set nents and orig_nents values. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v4 00/38] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lore.kernel.org/dri-devel/20200512085710.14688-1-m.szyprowski@samsung.com/T/ --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 11 +++-------- drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c | 7 +++---- 2 files changed, 6 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 7db5a79..6c67810 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -48,12 +48,9 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme src = sg_next(src); } - if (!dma_map_sg_attrs(attachment->dev, - st->sgl, st->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC)) { - ret = -ENOMEM; + ret = dma_map_sgtable(attachment->dev, st, dir, DMA_ATTR_SKIP_CPU_SYNC); + if (ret) goto err_free_sg; - } return st; @@ -73,9 +70,7 @@ static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, { struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); - dma_unmap_sg_attrs(attachment->dev, - sg->sgl, sg->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable(attachment->dev, sg, dir, DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sg); kfree(sg); diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c index debaf7b..be30b27 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c @@ -28,10 +28,9 @@ static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment, sg = sg_next(sg); } - if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { - err = -ENOMEM; + err = dma_map_sgtable(attachment->dev, st, dir, 0); + if (err) goto err_st; - } return st; @@ -46,7 +45,7 @@ static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *st, enum dma_data_direction dir) { - dma_unmap_sg(attachment->dev, st->sgl, st->nents, dir); + dma_unmap_sgtable(attachment->dev, st, dir, 0); sg_free_table(st); kfree(st); }