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Wed, 26 Aug 2020 06:35:38 +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 v9 19/32] drm: v3d: fix common struct sg_table related issues Date: Wed, 26 Aug 2020 08:33:03 +0200 Message-Id: <20200826063316.23486-20-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200826063316.23486-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSe0hTURzHO7t3d9e1xW1TPGgoDCyy0syii5o9MLtFoERQCGYzLz5yKpta +keaWvisdEGiKVME31PnI1PzsWzLVuarMEzTrMBKTZ3Ld3m9Wv99ft/f93u+h8PBEVE11woP Douk5WHSUAnGRxt0i28PNHM8/Q7m1kAyo7uLQ9ZkV3HJPw2ZCDkwP42R7bf7AVla/oJDqtpc SePAGIfUjL/nkv1NjzGysnOYR3b8+sI9IaASpnUYVZFfAahnJhVKPTGNcqlPaXoOVVsURw2t jSOUcrAYUM0f4jHqXl0ZoOY0Nt7bffhuAXRocDQtd3S/yg+a6fjJjSg0v5n3TgXiwRSRCsxw SByGuVkpSCrg4yKiBMClhRLADkYA5xdmUHaYA3CmRs/bijR1McwsigE0qqc2FhuRWR3JMEY4 wdTJVIxhc+IOgC8zBEwAIZ5yYGFKy3oHjosJL2gc9WU8KGEHe/KWUUYWEu5wslbCdtnC8up2 hGGzdVmfdh9jjoGElge/qUtR1uQBn+t0m5cTw+/6uk3eBQ3KdJQNJAI41l3JY4d0APsTsgHr coUfu5cwphkh9sKqJkdWPgkfavp4jAyJHXBwcicjI+uY1fAIYWUhTL4rYt27YY5e/a+2o6cP YZmCjROVm2+VCWB3wW/uA2Cb879MBUAZsKSjFLJAWuEcRt9wUEhliqiwQIdr4TINWP9HhjX9 fCNoXfHXAgIHEoFQhZ32E3Gl0YoYmRZAHJGYC0+9MVwRCQOkMbG0PNxPHhVKK7TAGkcllkLn wglfEREojaSv03QELd/acnAzq3ig5H+OGxlZcb9k0Xs8RBUnr3cLb59YPa/8unx0/7ZXvefW KpP2HPJU1QmSRI12gyaH+eSikU5qSOaSt2RZbTgS/IO+JdGbLnj7nBWblhds1BbI5frXA64C e/VgYqvgojKkLd+6JdpYkOx/RrzqEetV4VCv2+fS4a2dhcfyhhe9JKgiSOpkj8gV0r/WTreF QwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprMIsWRmVeSWpSXmKPExsVy+t/xe7q7mdziDZ49ZLToPXeSyWLjjPWs Fv+3TWS2uPL1PZvFgcbLjBYrVx9lsliw39riy5WHTBabHl9jtbi8aw6bxdojd9ktDn54wurA 49H0/hibx5p5axg99n5bwOKx/dsDVo/73ceZPDYvqfe4/e8xs8fkG8sZPXbfbGDz6NuyitHj 8ya5AO4oPZui/NKSVIWM/OISW6VoQwsjPUNLCz0jE0s9Q2PzWCsjUyV9O5uU1JzMstQifbsE vYyPB9+wFiwSqZh7dQFjA+M7gS5GTg4JAROJXSePs3cxcnEICSxllGg42M8KkZCRODmtAcoW lvhzrYsNougTo8Tz47+ZQRJsAoYSXW8hEiICnYwS07o/go1iFtjPJHH5yCl2kCphAV+Jn5ff MoHYLAKqEhfm/mbpYuTg4BWwk3i7WQlig7zE6g0HwIZyAoWPd/ezgdhCArYSp9fOYJ7AyLeA kWEVo0hqaXFuem6xoV5xYm5xaV66XnJ+7iZGYIRsO/Zz8w7GSxuDDzEKcDAq8fAuYHONF2JN LCuuzD3EKMHBrCTC63T2dJwQb0piZVVqUX58UWlOavEhRlOgmyYyS4km5wOjN68k3tDU0NzC 0tDc2NzYzEJJnLdD4GCMkEB6YklqdmpqQWoRTB8TB6dUA6PZTM0m9zAFQav59o82v7/GUlUz 0fbV/ktdO7zlo9oZ5rsWtAln/uT8MIHhaMoeryeS0za7N3nfvbd9XqBjnfd5ziBBdpupq+Lf ifvcjdr2NKfh3m07YZ7cNRLf15zZldP8w7y05RtrVuvO7A/WuiI6K7O3vtl2wPfk3rmRlcaa qjXCC7+H2yixFGckGmoxFxUnAgCW0JQipgIAAA== X-CMS-MailID: 20200826063539eucas1p2ed946c6214cdb8574ab288350db22f1a X-Msg-Generator: CA X-RootMTR: 20200826063539eucas1p2ed946c6214cdb8574ab288350db22f1a X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200826063539eucas1p2ed946c6214cdb8574ab288350db22f1a References: <20200826063316.23486-1-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 , 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 Reviewed-by: Eric Anholt --- drivers/gpu/drm/v3d/v3d_mmu.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/gpu/drm/v3d/v3d_mmu.c b/drivers/gpu/drm/v3d/v3d_mmu.c index 3b81ea28c0bb..5a453532901f 100644 --- a/drivers/gpu/drm/v3d/v3d_mmu.c +++ b/drivers/gpu/drm/v3d/v3d_mmu.c @@ -90,18 +90,17 @@ void v3d_mmu_insert_ptes(struct v3d_bo *bo) struct v3d_dev *v3d = to_v3d_dev(shmem_obj->base.dev); u32 page = bo->node.start; u32 page_prot = V3D_PTE_WRITEABLE | V3D_PTE_VALID; - unsigned int count; - struct scatterlist *sgl; + struct sg_dma_page_iter dma_iter; - for_each_sg(shmem_obj->sgt->sgl, sgl, shmem_obj->sgt->nents, count) { - u32 page_address = sg_dma_address(sgl) >> V3D_MMU_PAGE_SHIFT; + for_each_sgtable_dma_page(shmem_obj->sgt, &dma_iter, 0) { + dma_addr_t dma_addr = sg_page_iter_dma_address(&dma_iter); + u32 page_address = dma_addr >> V3D_MMU_PAGE_SHIFT; u32 pte = page_prot | page_address; u32 i; - BUG_ON(page_address + (sg_dma_len(sgl) >> V3D_MMU_PAGE_SHIFT) >= + BUG_ON(page_address + (PAGE_SIZE >> V3D_MMU_PAGE_SHIFT) >= BIT(24)); - - for (i = 0; i < sg_dma_len(sgl) >> V3D_MMU_PAGE_SHIFT; i++) + for (i = 0; i < PAGE_SIZE >> V3D_MMU_PAGE_SHIFT; i++) v3d->pt[page++] = pte + i; }