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Fri, 4 Sep 2020 13:35:03 +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 v10 17/30] drm: tegra: fix common struct sg_table related issues Date: Fri, 4 Sep 2020 15:16:58 +0200 Message-Id: <20200904131711.12950-18-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200904131711.12950-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSfUhTYRTGe3d3tztxcp2GL7OSVhoKbppBlwwrE7pBhIxMCFKXXlTyi121 9B9FU3RqZILNZaKWzfxMM7Op5KycNhtzWmkm5UdJH1a0pfmRtnnV/vud5zyH85yXF0MEWlSI xSYkU/IEWZyIY8du71s0eOcFSsN9evtdiSLDAItoUTajxFp7MUKM/P7BIe7VP2cRlU/8iSuq ajZhGZlkEa3Tr1FiWFPOIfItKg7R+GyCS2h/zqDEoqaCfdSBbKhoAGT3fCWbfKya4JKP5j+g 5PsCHYt8cCeDHF+dRsiSUTUgO8cyOWRR9ncOebWtDpDm1l3B9ufsDkdRcbGplFwSEGEXU9pa jiZpfC6vNXdzM4FynwLwMIgfgFp1DlsB7DABXgtg/q1XXKawAPh1UAeYwgxgtbmKuzlSYZlC mIYawPG6j8jWiNF0m2VzcXBfqJhTcGzsjOcA2F9kbzMheCECe0oXgK3hhEthoVmP2JiNu8M8 gxG1MR8PgHdNgwizzg3W3+9ZZ55Vf6icQRndxIX9ZQcZDoKKpTwWw07wi65tI+oOqC8pXL8O 4tkAThoauUxRCOBwlhIwLn/4zrBkjYpZ43nCZo2EkY/Bto5FYJMh7gBH5xxtMmLF6+03EEbm w7xcAeP2gCpd09ZardG0EZ+EfbVqlHmgYgBLa6e414Cb6v+ySgDqgAuVQsdHU/T+BOqSmJbF 0ykJ0eLIxPhWYP1Y+lWdpQNoVi70AhwDInv+tiPScAEqS6XT4nsBxBCRMz/wpT5MwI+SpaVT 8sRweUocRfcCV4wtcuH7VX8+L8CjZcnURYpKouSbXRbGE2aCxvrjXgtvco2z7sahZUVTyy8p +W0sK7jyULlnjbRMslu850RUOxnqyDu57HfKqzM9VRypd9cJ3XaeqXkRG7Q2aBpY+6vUBj0N das3sEJmTvNoY+m4t+VT5k3BWY+KoeLxMKWE3i4Mini7MtvV9cc9QjUSUFZQFTI65G2/V5uV IWLTMTJfL0ROy/4BssApWlQDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t/xu7odTkHxBqcuMVn0njvJZLFxxnpW i//bJjJbXPn6ns1i5eqjTBYL9ltbtMxaxGLx5cpDJotNj6+xWlzeNYfNovPLLDaLtUfuslsc /PCE1eLnrnksDnwea+atYfTY+20Bi8fOWXfZPbZ/e8Dqcb/7OJPH5iX1Hrf/PWb2mHxjOaPH 7psNbB69ze/YPPq2rGL0+LxJLoAnSs+mKL+0JFUhI7+4xFYp2tDCSM/Q0kLPyMRSz9DYPNbK yFRJ384mJTUnsyy1SN8uQS9j2qY5rAW7DCr+r9/L3sA4Q72LkZNDQsBEYt6XR8xdjFwcQgJL GSXmrWpmhUjISJyc1gBlC0v8udbFBmILCXxilHhwpBLEZhMwlOh6CxLn4hAR6GSUmNb9kR3E YRaYwiwx9X4DI0iVsECAxLQzM8AmsQioSnScuwBm8wrYSSy7dIYZYoO8xOoNB8BsTqD41hlP WCG22Up8mLOYZQIj3wJGhlWMIqmlxbnpucWGesWJucWleel6yfm5mxiB8bPt2M/NOxgvbQw+ xCjAwajEw8tgHxQvxJpYVlyZe4hRgoNZSYTX6ezpOCHelMTKqtSi/Pii0pzU4kOMpkBHTWSW Ek3OB8Z2Xkm8oamhuYWlobmxubGZhZI4b4fAwRghgfTEktTs1NSC1CKYPiYOTqkGxpKXX14p 7b2Xd1f5Wu2TFexT9xr//SV6sjvn2ZR4vqjkC891fT1m8N76/jim/PDJvfm3ZNsLLWpmmxW+ 0YyxvLlvVQ5zVbPD8mUdD7lS2ALufd21rDk2g78uWa3D+KGvXEjAhmcSjtaOxu8D4m6a3uXk iZcQuTIt9N5y/h7F7pQZMYuSdUs9lViKMxINtZiLihMBo67HBLUCAAA= X-CMS-MailID: 20200904133504eucas1p12ddfe8e0904a750bfe21f964821cb832 X-Msg-Generator: CA X-RootMTR: 20200904133504eucas1p12ddfe8e0904a750bfe21f964821cb832 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200904133504eucas1p12ddfe8e0904a750bfe21f964821cb832 References: <20200904131711.12950-1-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 , Jonathan Hunter , Thierry Reding , linux-tegra@vger.kernel.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 Reviewed-by: Robin Murphy --- drivers/gpu/drm/tegra/gem.c | 27 ++++++++++----------------- drivers/gpu/drm/tegra/plane.c | 15 +++++---------- 2 files changed, 15 insertions(+), 27 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/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 723df142a981..01d94befab11 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -98,8 +98,8 @@ static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo, * the SG table needs to be copied to avoid overwriting any * other potential users of the original SG table. */ - err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents, - GFP_KERNEL); + err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, + obj->sgt->orig_nents, GFP_KERNEL); if (err < 0) goto free; } else { @@ -196,8 +196,7 @@ static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) bo->iova = bo->mm->start; - bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl, - bo->sgt->nents, prot); + bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); if (!bo->size) { dev_err(tegra->drm->dev, "failed to map buffer\n"); err = -ENOMEM; @@ -264,8 +263,7 @@ static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) { if (bo->pages) { - dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents, - DMA_FROM_DEVICE); + dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); drm_gem_put_pages(&bo->gem, bo->pages, true, true); sg_free_table(bo->sgt); kfree(bo->sgt); @@ -290,12 +288,9 @@ static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) goto put_pages; } - err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents, - DMA_FROM_DEVICE); - if (err == 0) { - err = -EFAULT; + err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); + if (err) goto free_sgt; - } return 0; @@ -571,7 +566,7 @@ tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, goto free; } - if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) + if (dma_map_sgtable(attach->dev, sgt, dir, 0)) goto free; return sgt; @@ -590,7 +585,7 @@ static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, struct tegra_bo *bo = to_tegra_bo(gem); if (bo->pages) - dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); + dma_unmap_sgtable(attach->dev, sgt, dir, 0); sg_free_table(sgt); kfree(sgt); @@ -609,8 +604,7 @@ static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, struct drm_device *drm = gem->dev; if (bo->pages) - dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents, - DMA_FROM_DEVICE); + dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); return 0; } @@ -623,8 +617,7 @@ static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, struct drm_device *drm = gem->dev; if (bo->pages) - dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents, - DMA_TO_DEVICE); + dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE); return 0; } diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c index 4cd0461cc508..539d14935728 100644 --- a/drivers/gpu/drm/tegra/plane.c +++ b/drivers/gpu/drm/tegra/plane.c @@ -131,12 +131,9 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state) } if (sgt) { - err = dma_map_sg(dc->dev, sgt->sgl, sgt->nents, - DMA_TO_DEVICE); - if (err == 0) { - err = -ENOMEM; + err = dma_map_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0); + if (err) goto unpin; - } /* * The display controller needs contiguous memory, so @@ -144,7 +141,7 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state) * map its SG table to a single contiguous chunk of * I/O virtual memory. */ - if (err > 1) { + if (sgt->nents > 1) { err = -EINVAL; goto unpin; } @@ -166,8 +163,7 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state) struct sg_table *sgt = state->sgt[i]; if (sgt) - dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents, - DMA_TO_DEVICE); + dma_unmap_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0); host1x_bo_unpin(dc->dev, &bo->base, sgt); state->iova[i] = DMA_MAPPING_ERROR; @@ -186,8 +182,7 @@ static void tegra_dc_unpin(struct tegra_dc *dc, struct tegra_plane_state *state) struct sg_table *sgt = state->sgt[i]; if (sgt) - dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents, - DMA_TO_DEVICE); + dma_unmap_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0); host1x_bo_unpin(dc->dev, &bo->base, sgt); state->iova[i] = DMA_MAPPING_ERROR;