From patchwork Thu Jun 18 15:39:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 11612519 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 1CE6914E3 for ; Thu, 18 Jun 2020 15:40:41 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 EEF7E208C7 for ; Thu, 18 Jun 2020 15:40:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="j2ZV2oFR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EEF7E208C7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=samsung.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9CB9D6EB70; Thu, 18 Jun 2020 15:40:28 +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 3773A6EB6B for ; Thu, 18 Jun 2020 15:40:20 +0000 (UTC) Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout2.w1.samsung.com (KnoxPortal) with ESMTP id 20200618154018euoutp02ec28070f067f5d837e81d10c0d3e8ad0~ZrZmymBQP1250012500euoutp02a for ; Thu, 18 Jun 2020 15:40:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w1.samsung.com 20200618154018euoutp02ec28070f067f5d837e81d10c0d3e8ad0~ZrZmymBQP1250012500euoutp02a DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1592494818; bh=BUDsnzPfM8pecFmTHTRzLrmx2aEqpYyXAUW4mvYfV28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j2ZV2oFRMrGCaywwNNrqCbdbyyW5U75ngXK/V2zR6qmOh/dluGTEVEDky5ITNQEyk 4g/IpRjRpvljHuRi+CSWA61J6/AoBy/Pxh2Y7DmFG/EnxdhCRKO9NKMfFTE0sDA3r0 t/q8+U6oz1QKTxGfo5lDIRPeV9wbaXUeHG5lSE/k= Received: from eusmges1new.samsung.com (unknown [203.254.199.242]) by eucas1p2.samsung.com (KnoxPortal) with ESMTP id 20200618154018eucas1p26ba7a8cdc44363cbbd10ab03428eab17~ZrZmi99Za0607806078eucas1p2O; Thu, 18 Jun 2020 15:40:18 +0000 (GMT) Received: from eucas1p2.samsung.com ( [182.198.249.207]) by eusmges1new.samsung.com (EUCPMTA) with SMTP id DE.0F.61286.2EA8BEE5; Thu, 18 Jun 2020 16:40:18 +0100 (BST) Received: from eusmtrp2.samsung.com (unknown [182.198.249.139]) by eucas1p1.samsung.com (KnoxPortal) with ESMTPA id 20200618154018eucas1p1037a99bc0dc24e0ba61242e7b34c5818~ZrZmBgStb1248212482eucas1p1j; Thu, 18 Jun 2020 15:40:18 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20200618154018eusmtrp26611e9f6b80cabf5be0abbf0d9a6e422~ZrZmA3jaW0399203992eusmtrp2T; Thu, 18 Jun 2020 15:40:18 +0000 (GMT) X-AuditID: cbfec7f2-ef1ff7000001ef66-be-5eeb8ae2fe0e Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id D3.EE.08375.1EA8BEE5; Thu, 18 Jun 2020 16:40:17 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200618154017eusmtip183dd4207368bf9a26fc090eb2dfead5c~ZrZlXRMas0834108341eusmtip1L; Thu, 18 Jun 2020 15:40:17 +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 v6 06/36] drm: etnaviv: fix common struct sg_table related issues Date: Thu, 18 Jun 2020 17:39:27 +0200 Message-Id: <20200618153956.29558-7-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200618153956.29558-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSeUgUURzHeTN7jJsr4yr5sFLYyjDIIyOmPNASHEhIyIikNlcd1HJ13VFL gxKvbM3byrZLTfK+VtnKWzFXs7wzLUUtz1SSvMpQcx2t/z6/7+/75fve42GoQMk2xHz9gyiZ v9hPyOGxVM2/O458lc+ILNbrDhDx7a0IUZZewiY2VMko0bv0g0NUpg9yibyCtwiRUWdNjDwd QIjF3lGEUH7rYxM9lU84RFHTEJdomB9j2/PJwmeFgKxZzmCRr5ZH2ORwnBohy7Nvk1/Wv6Fk an8OIKsGwjlk4poFmVCRD8gFpZHLLjeejRfl5xtCyczt3Hk+K+UxXOnK/hsvm7s44SDBSA4w DOLH4OdZRA54mADPBfBj3xqXGRYBTOjP294sAFhaW8XaSeTdOc7oOQC+z3qwadJiEqooXQ1z cEson5NzNKyPRwPYEq+tYRQfRuCf6asa1sPPwdaKrq0sCz8INyI0fgzj47ZQVSTWyBA3hgWl 9aiGtXA72KaOZmt6Id7Mhfc757mMyRH2KZpZDOvB7+qKbX0v3HjzHGECkQCOthdxmeEegD0R 6YBxWcPB9tWtZhQ3hSWV5ozsAFdT8jnMhXVg/5wuc34dmKJ6iDIyH8bGCBi3CVSoi//VNnR2 owyT8PHq+PaDJgO4PDTBTgLGiv9lGQDkAwMqmJZ4U7SlP3XdjBZL6GB/bzPPAIkSbP6ktnX1 z9dgqdujEeAYEGrz7S/MiARscQgdKmkEEEOF+vxTH9pEAr6XODSMkgVckQX7UXQj2IOxhAZ8 q6zpywLcWxxEXaMoKSXb2SKYlmE4iJzIjPP0mI1QzJ4NrXB1lwVlOqaLrLJFHqZpTtIT/U7v EJdLbia/Wma7jsqNUgrPxOZKs6iO8JsrU8XO9dU9TfPjLxwC9+0Os62+e7pscmkyWZWWVO18 /uKUzZhra8Cj7BYTM/74J5ZhcI3kkNUtQa40MdBcORyV2nOyVtJC89qELNpHbHkYldHivwPO JYZFAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprKIsWRmVeSWpSXmKPExsVy+t/xu7oPu17HGSzYYG3Re+4kk8XGGetZ Lf5vm8hsceXrezaLXTPusFusXH2UyWLBfmuLB3NvMll8ufKQyWLT42usFpd3zWGzWHvkLrvF wQ9PWB14PdbMW8PosffbAhaP7d8esHrc7z7O5LF5Sb3H7X+PmT0m31jO6LH7ZgObR/9fA4++ LasYPT5vkgvgjtKzKcovLUlVyMgvLrFVija0MNIztLTQMzKx1DM0No+1MjJV0rezSUnNySxL LdK3S9DL+L65jb3gu3LFsmMX2RoY++S6GDk4JARMJFa2m3UxcnEICSxllDj0ZwpbFyMnUFxG 4uS0BlYIW1jiz7UuNoiiT4wS9w6uZQJJsAkYSnS9hUiICHQySkzr/sgOkmAWeM4k8bJFH8QW FgiUmLBhOdhUFgFVif9NIA0cHLwCthLb1iZCLJCXWL3hADOIzSlgJ3H6eCvYYiGgkucf2tgm MPItYGRYxSiSWlqcm55bbKhXnJhbXJqXrpecn7uJERgl24793LyD8dLG4EOMAhyMSjy8L0Je xwmxJpYVV+YeYpTgYFYS4XU6ezpOiDclsbIqtSg/vqg0J7X4EKMp0E0TmaVEk/OBEZxXEm9o amhuYWlobmxubGahJM7bIXAwRkggPbEkNTs1tSC1CKaPiYNTqoGR087TkcF3lcZ8E9kekdeH o9Lv8B/mTBCaxHFvwjzVYK7w9hTNqmyFM+8NN2vuWSx9Nyrc0tLfdG1JueXG17M/71opltFn zHBpZvajwDKbs0Iex9euvz3ndnhJhNAt/r21VV9kb3AaH/miOkc9JCZbv/tR9satuw+vaK49 4OZjf09s0Wo/s5tKLMUZiYZazEXFiQDSfWdeqAIAAA== X-CMS-MailID: 20200618154018eucas1p1037a99bc0dc24e0ba61242e7b34c5818 X-Msg-Generator: CA X-RootMTR: 20200618154018eucas1p1037a99bc0dc24e0ba61242e7b34c5818 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200618154018eucas1p1037a99bc0dc24e0ba61242e7b34c5818 References: <20200618153956.29558-1-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: Bartlomiej Zolnierkiewicz , David Airlie , etnaviv@lists.freedesktop.org, 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 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);