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Fri, 19 Jun 2020 10:37:05 +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 , Thierry Reding , Jonathan Hunter , linux-tegra@vger.kernel.org Subject: [PATCH v7 20/36] drm: tegra: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:20 +0200 Message-Id: <20200619103636.11974-21-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: H4sIAAAAAAAAA0WSaUhUYRSG+eYuc11GbqPkh4rCYIKRGwpeUSSjH/dHtKgQKY1OelHLGWXG nUhJKxu1Ms1lEjMxNZdcMzMrR7Kp1Klccsql1Ah3K5dUSpvbVfv3nvc873cOh49AhGrMgoiQ xTBymSRShBuiLS/XtQ6+t+bEzkNlHlSW9jWPaiiow6itlmyEGlhZxKn71V08quS5J5WmKkWp 5YFxHtU4+QGj+tuKcOrqsgqnal+M8in1968Ytd5WjB40oWuKawD9dLUEpR+rRvn0o9UvGP05 Q8Ojm8qS6eHNSYTO0VUA+snHFJzOSl3A6WvNVYBearQ+bhxg6BXKREbEMXIn72DD8PKxt0h0 unPC4sMZPAXM2imBAQFJN6iemOYpgSEhJCsBvFdSiHDFMoAZa3mAK5YArJ5L5e9EcirLUa5R AeDgm0J0NzK8fBtjKZx0gcp5Jc5qM/ISgK+yjFkIITMR2JH3C7ANU/IEzC3o+weh5D7Y2zPF Y7WA9IZV5TqUG2cDq+s7EFYb6P3ZNDXGPgTJT3yY++Mnj4MOwytbbTinTeGMpnl7VyvYnZOJ coFUAMe1tXyuyASw/2IB4ChPOKLd0KcJ/X72sK7NibN9YMNEBsbakDSBuvk9rI3o5c2WfISz BTD9spCj7aBK82B3rPpd3zZCw558S+5A2QDe3WpHbgAb1f9ZJQBUAXMmViENYxSuMibeUSGR KmJlYY4hUdJGoP9Y3ZualVbw7PeZTkASQGQsmPKfFQsxSZwiUdoJIIGIzASHervFQkGoJDGJ kUcFyWMjGUUnsCRQkbnAtXT6tJAMk8Qw5xgmmpHvdHmEgUUKcDhmlZOkSxCqAg/464aLh026 wupxe6PqmD8LAWMRI3t9NK7lEcr682LPoSrt+wBbd+CcZ519tm9tSOPXW2Q8JQuOd1xsiY3z ncsSBB11MwpMFrde6LAlNuLmx9ybs+2OeHl8W+sZ8s1M9bMYPNl+/VRCSEa9karJEQbX9hXc cRahinCJy35ErpD8BWSngTVUAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t/xe7pBU9/EGaz9p2bRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t0TJrEYvFlysPmSw2Pb7GanF51xw2i84vs9gs1h65y25x 8MMTVoufu+axOPB5rJm3htFj77cFLB47Z91l99j+7QGrx/3u40wem5fUe9z+95jZY/KN5Ywe u282sHn0Nr9j8+jbsorR4/MmuQCeKD2bovzSklSFjPziElulaEMLIz1DSws9IxNLPUNj81gr I1MlfTublNSczLLUIn27BL2MZffOMxd0GFS83/qKrYHxtVoXIyeHhICJxOQVy1i6GLk4hASW Mkp0zH7PBpGQkTg5rYEVwhaW+HOtCywuJPCJUWJXrzqIzSZgKNH1FiTOxSEi0MkoMa37IzuI wywwhVli6v0GRpAqYQF/iQV3TrOD2CwCqhJnz7xgArF5BewkVi27wQKxQV5i9YYDzCA2J1D8 dctBVohtthLLF7xnnsDIt4CRYRWjSGppcW56brGRXnFibnFpXrpecn7uJkZg/Gw79nPLDsau d8GHGAU4GJV4eF+EvI4TYk0sK67MPcQowcGsJMLrdPZ0nBBvSmJlVWpRfnxRaU5q8SFGU6Cj JjJLiSbnA2M7ryTe0NTQ3MLS0NzY3NjMQkmct0PgYIyQQHpiSWp2ampBahFMHxMHp1QD49Xv 4t8un3XZfzh+4pcE9vnVs87x78vqvfJkZzpDuorUL02ht7s9lt9huWDFKnTzjvu67CMhlyuX Tliz+fSLJa5+M8Suxa2oCLiYqf409+/FtUwmcZ+338n46WCyt/jA9gTXdTe++ium1E+68MrZ +Y3kM8k56wuncpjaFF6smvL0iIqu862bwk1KLMUZiYZazEXFiQDgEq+0tQIAAA== X-CMS-MailID: 20200619103706eucas1p2b9a9926941e812db1111ec46a97695cd X-Msg-Generator: CA X-RootMTR: 20200619103706eucas1p2b9a9926941e812db1111ec46a97695cd X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103706eucas1p2b9a9926941e812db1111ec46a97695cd References: <20200619103636.11974-1-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 --- drivers/gpu/drm/tegra/gem.c | 27 ++++++++++----------------- drivers/gpu/drm/tegra/plane.c | 15 +++++---------- 2 files changed, 15 insertions(+), 27 deletions(-) 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 9ccfb56e9b01..0d2ef1662a39 100644 --- a/drivers/gpu/drm/tegra/plane.c +++ b/drivers/gpu/drm/tegra/plane.c @@ -130,12 +130,9 @@ 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 @@ -143,7 +140,7 @@ 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; } @@ -165,8 +162,7 @@ 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; @@ -185,8 +181,7 @@ 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;