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Wed, 13 May 2020 13:33:20 +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 , Dmitry Osipenko , Mauro Carvalho Chehab , Greg Kroah-Hartman , Thierry Reding , Jonathan Hunter , linux-media@vger.kernel.org, linux-tegra@vger.kernel.org, devel@driverdev.osuosl.org Subject: [PATCH v5 33/38] staging: tegra-vde: fix common struct sg_table related issues Date: Wed, 13 May 2020 15:32:40 +0200 Message-Id: <20200513133245.6408-33-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200513133245.6408-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUwTURSGvZ3pdKgUh2LkBhdME3GJghU1N6BEAw/jizHRF0lAikwAZTEd FjEakSqytLgQtwYM4sJWKBREpCyyiQjWKiDIIpAaIygguywBWwb17Tv/OX/+c08uiYkH+Q5k cFgEIw+ThUgIIV76etawSzKj992dY8KQytDEQ0X3tXy0VHoLQxUtcwKUN2YCqG1qlECKx1oC 5eQ18FBGtTu6qs7E0WTbAA/pTJ/4qLU8jUDKwud8lDipJlB+fa8APdMt8FDNr698NFv+ED9k R2seagD9paoOpyunM3D6pbpXQOtyEwn6xXQ/n65O1wjovuRGHl385DLdvWjC6NTOLEDrP8cS tEoxQtApJbmAntBtOrbGW3gggAkJjmLkLh5+wqDSu9/xc+PU+Z9GJT8WPLBJAlYkpPbCpr5K kASEpJjKBvBuXTfOFZMA9tx5ulJMANgVb8T+Wgzt7QTXyAKwXNHP+2d5l36bZ5kiKClMGk4i LLyWugbgG5W1hTGqBYctv10tbEedhEULZbiFcWoLjE1IBxYWUQdhe9V1gktzhHmFr5aTrcz6 UE/18kqQUpFQP24A3JAX7Ehpxjm2g0ONJQKON8DmVOWKQQHggCFfwBVKAFvj7q+43WGPYc4c R5rX2w615S6cfBiOjhiXZUjZwM5hW+4BNvB26T2Mk0UwIV7MTTtBdWPBv9ga48eVa9EwW9En 4A5UB+C8upi4CRzV/8MyAMgF9kwkGxrIsNIwJtqZlYWykWGBzqfDQ3XA/AGbFxvHy8DUR/9a QJFAYi1CXXpfMV8WxcaE1gJIYpK1oqNasyQKkMVcYOThp+SRIQxbC9aTuMRe5Jo56COmAmUR zFmGOcfI/3Z5pJVDLNg/E7UwjT12Pn5Deuzt0qPkA0fBibE4231N85RKX5Bj27RHG+d2ZfV8 5lOqI1OakGv7Ibv2henWBFgyngmOXuX9vLvDkOej9NytEXn1rfP/dmSr94+ai35BwZ6zNwc2 Z51gE4ViWNXrZrXzUUN/lcYrZuPgtks1bfXvK66nOek9iiQ4GyST7sDkrOwPWfDyNHwDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrNIsWRmVeSWpSXmKPExsVy+t/xu7qK33fHGdzbrWjRe+4kk8XGGetZ Lf5vm8hssefML3aL1R8fM1pc+fqezaJ58Xo2i5WrjzJZLNhvbdEyaxGLxZcrD5ksNj2+xmpx edccNoueDVtZLTq/zGKzWHvkLrvFsk1/mCwOfnjCavFz1zwWB2GPNfPWMHrc23eYxWPvtwUs Hjtn3WX32LSqk81j+7cHrB77565h97jffZzJY/OSeo/b/x4ze0y+sZzRY/fNBjaP3uZ3bB59 W1YxenzeJBfAH6VnU5RfWpKqkJFfXGKrFG1oYaRnaGmhZ2RiqWdobB5rZWSqpG9nk5Kak1mW WqRvl6CXsW3aC5aCTwIVby70sDYwzuTrYuTkkBAwkTh39SpbFyMXh5DAUkaJidtfMkMkZCRO TmtghbCFJf5c64Iq+sQoseXXfrAiNgFDia63EAkRgU5GiWndH9lBHGaBGywSc7d8YAepEhYI l3g7ZQ4LiM0ioCrR0DGXEcTmFbCVuLqvnQ1ihbzE6g0HwKZyAsVf3dkPVi8kkC+xd/E+tgmM fAsYGVYxiqSWFuem5xYb6RUn5haX5qXrJefnbmIERuS2Yz+37GDsehd8iFGAg1GJh9fi1u44 IdbEsuLK3EOMEhzMSiK8fuuBQrwpiZVVqUX58UWlOanFhxhNgY6ayCwlmpwPTBZ5JfGGpobm FpaG5sbmxmYWSuK8HQIHY4QE0hNLUrNTUwtSi2D6mDg4pRoY1xz1mTXv2TeNJ493mhRmmfoI Tn/FLlosVPk8LWnepql6azkc+090O9woL+F/dt3Nj/f+a5W/WU3pkw/vYfDVvPjy/fG4i2I+ RWZ9Xunsu3lW/tq6yK5gvfD5fxLObe5VZzNOPHjz8pDMTIneGO7SyStvfPetz4nx/Xbvps81 Y+EtWuo2gTMnKrEUZyQaajEXFScCALAaeATeAgAA X-CMS-MailID: 20200513133321eucas1p13acea3aa6219ce5f7076c7677ef9eae3 X-Msg-Generator: CA X-RootMTR: 20200513133321eucas1p13acea3aa6219ce5f7076c7677ef9eae3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200513133321eucas1p13acea3aa6219ce5f7076c7677ef9eae3 References: <20200513132114.6046-1-m.szyprowski@samsung.com> <20200513133245.6408-1-m.szyprowski@samsung.com> Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@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 Reviewed-by: Dmitry Osipenko --- For more information, see '[PATCH v5 00/38] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lore.kernel.org/linux-iommu/20200513132114.6046-1-m.szyprowski@samsung.com/T/ --- drivers/staging/media/tegra-vde/iommu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/tegra-vde/iommu.c b/drivers/staging/media/tegra-vde/iommu.c index 6af863d..adf8dc7 100644 --- a/drivers/staging/media/tegra-vde/iommu.c +++ b/drivers/staging/media/tegra-vde/iommu.c @@ -36,8 +36,8 @@ int tegra_vde_iommu_map(struct tegra_vde *vde, addr = iova_dma_addr(&vde->iova, iova); - size = iommu_map_sg(vde->domain, addr, sgt->sgl, sgt->nents, - IOMMU_READ | IOMMU_WRITE); + size = iommu_map_sgtable(vde->domain, addr, sgt, + IOMMU_READ | IOMMU_WRITE); if (!size) { __free_iova(&vde->iova, iova); return -ENXIO;