From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 B3C18C433E1 for ; Fri, 19 Jun 2020 10:38:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A69D208B8 for ; Fri, 19 Jun 2020 10:38:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="SNlWrTnY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732438AbgFSKiI (ORCPT ); Fri, 19 Jun 2020 06:38:08 -0400 Received: from mailout1.w1.samsung.com ([210.118.77.11]:38668 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732424AbgFSKg7 (ORCPT ); Fri, 19 Jun 2020 06:36:59 -0400 Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout1.w1.samsung.com (KnoxPortal) with ESMTP id 20200619103657euoutp0179f1ea108541aa599aed65bb99c9622b~Z66B6ryd11761017610euoutp011 for ; Fri, 19 Jun 2020 10:36:57 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w1.samsung.com 20200619103657euoutp0179f1ea108541aa599aed65bb99c9622b~Z66B6ryd11761017610euoutp011 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1592563017; bh=BUDsnzPfM8pecFmTHTRzLrmx2aEqpYyXAUW4mvYfV28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SNlWrTnYkCz7Zb8VPzTwcHyz+TL1RVLW8iEGWAIeHI8n7G8OwAl4X+S/LayHPg0g4 /TX3ZtiKn5cUKrP11lOSH18RCjUZ8hyzbaRZsD6ZDVfCjoKITf/s3qJAg6Vu5cR1Ta hxLKamFeUQHPFcY0FdYxCdXcrSoguY62SQMKD0V0= Received: from eusmges2new.samsung.com (unknown [203.254.199.244]) by eucas1p1.samsung.com (KnoxPortal) with ESMTP id 20200619103657eucas1p1acec81d0405a3000b1e3cfde96d01e0d~Z66BlNJnW3246432464eucas1p1j; Fri, 19 Jun 2020 10:36:57 +0000 (GMT) Received: from eucas1p2.samsung.com ( [182.198.249.207]) by eusmges2new.samsung.com (EUCPMTA) with SMTP id 1F.8D.05997.9459CEE5; Fri, 19 Jun 2020 11:36:57 +0100 (BST) Received: from eusmtrp1.samsung.com (unknown [182.198.249.138]) by eucas1p2.samsung.com (KnoxPortal) with ESMTPA id 20200619103657eucas1p2b7cec8f7b477c9574e2594ad6644a780~Z66BQrYY02889228892eucas1p2k; Fri, 19 Jun 2020 10:36:57 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200619103657eusmtrp169f64dd2b8cad524390c196ceea91b8d~Z66BQB5I40959609596eusmtrp1w; Fri, 19 Jun 2020 10:36:57 +0000 (GMT) X-AuditID: cbfec7f4-65dff7000000176d-d3-5eec954909d8 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id CC.DA.06314.8459CEE5; Fri, 19 Jun 2020 11:36:56 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200619103656eusmtip2c6c962eea3bd07d12b3e049b89c1473c~Z66Aon5lM3164531645eusmtip2T; Fri, 19 Jun 2020 10:36:56 +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 Cc: Marek Szyprowski , Christoph Hellwig , Robin Murphy , Bartlomiej Zolnierkiewicz , linux-arm-kernel@lists.infradead.org, David Airlie , Daniel Vetter , Lucas Stach , etnaviv@lists.freedesktop.org Subject: [PATCH v7 06/36] drm: etnaviv: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:06 +0200 Message-Id: <20200619103636.11974-7-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200619103636.11974-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUwTYRSF/Wc6C0h1rBiuKJiUKHEB3BInQYkaH8bERCO+SGJ1hBFQtrSC awJuVSqCgCKCGlwiIFW0LGIrS1Go2lAVidqAsiiE1Y1NEUHGAXz77vnvyTm5+WlcUUS40qER +wV1BB+mJB1lxdW/XnptvNitWvrkh4I9Z3uOsQ/S8wl2tDgZZ+v6v5KsMb2BYnPzqjA2q9yX bbpqx9i+umaMNXx6S7BvjFdI9u7TDxRr/vaZWCvn9Nf0iCsdyJJxDweaCK7xrAXjCm7FcvUj n3Au9X024kz2OJJL+rOUSyy8g7heg/uWqQGOq4OEsNAYQe3jt8sxZLBAS0UNehy8Xf2ajEOJ 7jrkQAOzEsrjz5A65EgrmBwEZm0iIQ19CM432Slp6EWQ0piCTVgsQ+ZxSzaCr/WZ5KSl84IB iVskswx0PTpSZGfmFIJn55xExplGDH537BV5JuMPqcNVlMgyZj58L63/lyBn1oDpZSYlpc2D vPsVuMgOjB90nTQTkl5JweNXnhJvgI5W23i7mdBpKRz3zgVraoJMLAfMCQTNtruUNCQgeHM8 HUlbvtBgGxprSo+1Wwj5Rh9JXgdPTYOUKAMzDd73zJD6T4OU4ku4JMvhjFYhbS+ADMu9yVjz q1pcYg46zpZi0n2SEYw2f5SdR/My/odlIXQHuQjRmvBgQbM8QjjgreHDNdERwd6BkeEGNPaZ rCOWvhJkHN5diRgaKZ3k7du6VAqCj9EcCq9EQONKZ/n6GqtKIQ/iDx0W1JE71dFhgqYSzaFl Shf5ihsdOxRMML9f2CcIUYJ64hWjHVzj0NE95f69uXlp/qejfkKNNdR2+hYnu1nk+6W2Ik17 O8Rt6MXB68c8TG3x6n5/tnWVp4+rGxFrL9Prg6q8NnfOfhSTPNAyvS3JK+GDPWfFEhdhk7Xl Xb+NDywbVXXrPLZGWrXeSZdRY+ustSMZo1NKGg7oW7anta+2HpmVHGDLd16slGlC+GWLcLWG /wur3wDWSAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOIsWRmVeSWpSXmKPExsVy+t/xe7oeU9/EGVy9YG3Re+4kk8XGGetZ Lf5vm8hsceXrezaLXTPusFusXH2UyWLBfmuLB3NvMll8ufKQyWLT42usFpd3zWGzWHvkLrvF wQ9PWB14PdbMW8PosffbAhaP7d8esHrc7z7O5LF5Sb3H7X+PmT0m31jO6LH7ZgObR/9fA4++ LasYPT5vkgvgjtKzKcovLUlVyMgvLrFVija0MNIztLTQMzKx1DM0No+1MjJV0rezSUnNySxL LdK3S9DL+L65jb3gu3LFsmMX2RoY++S6GDk5JARMJI7/OsjWxcjFISSwlFHi6pt+VoiEjMTJ aQ1QtrDEn2tdUEWfGCU+zO1mA0mwCRhKdL2FSIgIdDJKTOv+yA6SYBZ4ziTxskUfxBYWCJTo 3NzKDGKzCKhKfNx7mwnE5hWwldh9fjY7xAZ5idUbDoDVcArYSbxuOQi2WQioZvmC98wTGPkW MDKsYhRJLS3OTc8tNtQrTswtLs1L10vOz93ECIyUbcd+bt7BeGlj8CFGAQ5GJR7eFyGv44RY E8uKK3MPMUpwMCuJ8DqdPR0nxJuSWFmVWpQfX1Sak1p8iNEU6KiJzFKiyfnAKM4riTc0NTS3 sDQ0NzY3NrNQEuftEDgYIySQnliSmp2aWpBaBNPHxMEp1cDolej6/2HauseaUst2FSsYr964 duqu1xNt01d7r3F6XbS50DJ8zZegDRdfFnUa7qthkurq6DSeHqgwM3JPpuTVDU8/Rm+wPrUg 4OmNoH7bKYqK5fJqjVov7j5jZtUOvKIi7XSN/XvPp+YprpuNkh4eYjaKOVP39M3uLs5I9/db m+KW+6yT++6gxFKckWioxVxUnAgAMgFcwKoCAAA= X-CMS-MailID: 20200619103657eucas1p2b7cec8f7b477c9574e2594ad6644a780 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200619103657eucas1p2b7cec8f7b477c9574e2594ad6644a780 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103657eucas1p2b7cec8f7b477c9574e2594ad6644a780 References: <20200619103636.11974-1-m.szyprowski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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. To avoid such issues, lets use a common dma-mapping wrappers operating directly on the struct sg_table objects and use scatterlist page iterators where possible. This, almost always, hides references to the nents and orig_nents entries, making the code robust, easier to follow and copy/paste safe. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/etnaviv/etnaviv_gem.c | 12 +++++------- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 13 +++---------- 2 files changed, 8 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c index f5e5bb8ba953..9f4613f7e255 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c @@ -27,7 +27,7 @@ static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) * because display controller, GPU, etc. are not coherent. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) - dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); + dma_map_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); } static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) @@ -51,7 +51,7 @@ static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj * discard those writes. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) - dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); } /* called with etnaviv_obj->lock held */ @@ -404,9 +404,8 @@ int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, } if (etnaviv_obj->flags & ETNA_BO_CACHED) { - dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, - etnaviv_obj->sgt->nents, - etnaviv_op_to_dma_dir(op)); + dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt, + etnaviv_op_to_dma_dir(op)); etnaviv_obj->last_cpu_prep_op = op; } @@ -421,8 +420,7 @@ int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) if (etnaviv_obj->flags & ETNA_BO_CACHED) { /* fini without a prep is almost certainly a userspace error */ WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); - dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, - etnaviv_obj->sgt->nents, + dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt, etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); etnaviv_obj->last_cpu_prep_op = 0; } diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c index 3607d348c298..13b100553a0b 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -79,7 +79,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, if (!context || !sgt) return -EINVAL; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { + for_each_sgtable_dma_sg(sgt, sg, i) { u32 pa = sg_dma_address(sg) - sg->offset; size_t bytes = sg_dma_len(sg) + sg->offset; @@ -95,14 +95,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, return 0; fail: - da = iova; - - for_each_sg(sgt->sgl, sg, i, j) { - size_t bytes = sg_dma_len(sg) + sg->offset; - - etnaviv_context_unmap(context, da, bytes); - da += bytes; - } + etnaviv_context_unmap(context, iova, da - iova); return ret; } @@ -113,7 +106,7 @@ static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova, unsigned int da = iova; int i; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { + for_each_sgtable_dma_sg(sgt, sg, i) { size_t bytes = sg_dma_len(sg) + sg->offset; etnaviv_context_unmap(context, da, bytes); -- 2.17.1