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Tue, 28 Apr 2020 13:20:29 +0000 (GMT) X-AuditID: cbfec7f5-a29ff7000001ed1a-8f-5ea82d9dfd5c Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 02.E3.07950.D9D28AE5; Tue, 28 Apr 2020 14:20:29 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200428132028eusmtip2b44644ae4720ed3e765aad715106ddc1~J-l9LaKkD0625706257eusmtip2M; Tue, 28 Apr 2020 13:20:28 +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 Date: Tue, 28 Apr 2020 15:20:00 +0200 Message-Id: <20200428132005.21424-13-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200428132005.21424-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUwTURSGc2famSlSHAsJN6AQK5JgAkgwYSJINDFkfFDkxQcTwQpjWQtp KYgJAXEB2QIuAVkElaWWIktJQXCBsmNsZAmbFGTTICAgW1ADth3Et+/8/3/uOTm5BCrQcm2I EEk0I5WIwoWYGUfTsaVzLnRW+B9XF3lQGbpuhCqtuoVTNblVXCpJ24NRO5pslBpYX8KolxXt CJWfpUao4vee1NrAJELVTg9yqf7GAoyqbNPjVMvyDJfq0a/ip/fTqqcqQL/dKObQY4NvMLp+ 4wuXnkjrRGh1SQL9eXsapR8OlwO6aSQRozPrlIBerbW7uO+ymVcQEx4Sw0hdva+aBT/pHUOi hpxu7PQqsUTQcTgV8AhInoCZ1c1YKjAjBKQCwK2uZyhbrAFY/vXRrrMKYFnGD86/FpV2nsMa 5QCmT+Xiey01S3rMmMJIN5i6mGpiK/IugF0Z5sYQSmpQOFPehhsNS/IcvJ+2YmIOeRT+VnSb mE96Q3XJLMqOs4cV1c0m5hn00qlZ006Q7MPh1LIKYUNnYX5pIZdlS/i9sw5n+SDceV2EsA23 AZzUVeJskQ5gf1IuYFOecEz3y/AsYdjPCVY1urLyGVjYVoMaZUhawOHFA0YZNeADTc6uzIcp 9wRs2hHmdb7aG9vyqW93fxqWaFcQ9kLZACqnu0AWsM/7P6wYACWwZuSyCDEjc5cwsS4yUYRM LhG7BEZG1ALDz/qw3bneAN79uaYFJAGE5vxqc4W/gCuKkcVFaAEkUKEVfyq4zF/ADxLF3WSk kQFSeTgj0wJbgiO05rs/n7siIMWiaCaMYaIY6T8XIXg2iWDYId7mQmaYuV5+MjlWHHeJ9r7z sSttVJjnZd+U5rBQ4atkfOUW3144/XTk1wfP58j91kOaQ1vx8fFDAY+Hwib8PUZ4UUd0tpML oZYpqoJ4nqfFZuCQT6tYMbrZ7DMn0secGr3eYJdAtdfwwofXK0olPcnnB/x6pWvTsS4bqyoh RxYscjuGSmWiv3iau05VAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t/xe7pzdVfEGfzcI23Re+4kk8XS9Y3s FhtnrGe1aDp0is3i/7aJzBZXvr5ns1i5+iiTxewJm5ksFuy3tvhy5SGTxabH11gtLu+aw2ax 9shddouDH56wWpy6+5ndgd9jzbw1jB57vy1g8bhzbQ+bx/ZvD1g97ncfZ/LYvKTe4/a/x8we k28sZ/TYfbOBzaNvyypGj8+b5AK4o/RsivJLS1IVMvKLS2yVog0tjPQMLS30jEws9QyNzWOt jEyV9O1sUlJzMstSi/TtEvQyZl68w1RwXbPi/8VVbA2MxxS7GDk5JARMJNYces3SxcjFISSw lFHi0KfvbBAJGYmT0xpYIWxhiT/Xutggij4xSuyffpsZJMEmYCjR9RYiISLQySgxrfsjO4jD LHCAWaL7/EkmkCphAU+JTrAEJweLgKrE7xUnwWxeATuJzUueMkOskJdYveEAmM0JFF/66CnQ VA6gdbYSl1tyJzDyLWBkWMUoklpanJueW2ykV5yYW1yal66XnJ+7iREYP9uO/dyyg7HrXfAh RgEORiUe3g08K+KEWBPLiitzDzFKcDArifA+ylgWJ8SbklhZlVqUH19UmpNafIjRFOimicxS osn5wNjOK4k3NDU0t7A0NDc2NzazUBLn7RA4GCMkkJ5YkpqdmlqQWgTTx8TBKdXAKPOw2OhW o3xA6/rJnS8DjM8nWxhq7baRaFhlENb35/7FjRyFYmGdMy9xyc910p+f/ezz7sC4q8G3Lk5j +nM290Zsv+XvwyvrlqlGuqS9bU+JN5Wq9LLiP8wmK31x0xOv5y9Dnfb+9HwVGGfAYTf7sBqb 9gm59N3X9tuvkvnNxem7u8Ho3bN0JZbijERDLeai4kQAfeCBeLUCAAA= X-CMS-MailID: 20200428132029eucas1p2433959853ef384ef783cbe9a1e45fde3 X-Msg-Generator: CA X-RootMTR: 20200428132029eucas1p2433959853ef384ef783cbe9a1e45fde3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200428132029eucas1p2433959853ef384ef783cbe9a1e45fde3 References: <20200428132005.21424-1-m.szyprowski@samsung.com> Subject: [Intel-gfx] [RFC 12/17] drm: tegra: fix sg_table nents vs. orig_nents misuse X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bartlomiej Zolnierkiewicz , David Airlie , intel-gfx@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Benjamin Gaignard , Robin Murphy , Sumit Semwal , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" The Documentation/DMA-API-HOWTO.txt states that dma_map_sg returns the numer of the created entries in the DMA address space. However the subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be called with the original number of entries passed to dma_map_sg. The sg_table->nents in turn holds the result of the dma_map_sg call as stated in include/linux/scatterlist.h. Adapt the code to obey those rules. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/tegra/gem.c | 25 +++++++++++++------------ drivers/gpu/drm/tegra/plane.c | 13 +++++++------ 2 files changed, 20 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 6237681..5710ab4 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 { @@ -197,7 +197,7 @@ 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->sgt->orig_nents, prot); if (!bo->size) { dev_err(tegra->drm->dev, "failed to map buffer\n"); err = -ENOMEM; @@ -264,7 +264,7 @@ 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_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->orig_nents, DMA_FROM_DEVICE); drm_gem_put_pages(&bo->gem, bo->pages, true, true); sg_free_table(bo->sgt); @@ -290,9 +290,9 @@ 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) { + bo->sgt->nents = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->orig_nents, + DMA_FROM_DEVICE); + if (bo->sgt->nents == 0) { err = -EFAULT; goto free_sgt; } @@ -571,7 +571,8 @@ int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) goto free; } - if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) + sgt->nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir); + if (sgt->nents == 0) goto free; return sgt; @@ -590,7 +591,7 @@ 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_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir); sg_free_table(sgt); kfree(sgt); @@ -609,7 +610,7 @@ 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_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->orig_nents, DMA_FROM_DEVICE); return 0; @@ -623,8 +624,8 @@ 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_sg_for_device(drm->dev, bo->sgt->sgl, + bo->sgt->orig_nents, DMA_TO_DEVICE); return 0; } diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c index 9ccfb56..3982bf8 100644 --- a/drivers/gpu/drm/tegra/plane.c +++ b/drivers/gpu/drm/tegra/plane.c @@ -130,9 +130,10 @@ 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) { + sgt->nents = dma_map_sg(dc->dev, sgt->sgl, + sgt->orig_nents, + DMA_TO_DEVICE); + if (sgt->nents == 0) { err = -ENOMEM; goto unpin; } @@ -143,7 +144,7 @@ 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; } @@ -165,7 +166,7 @@ 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_unmap_sg(dc->dev, sgt->sgl, sgt->orig_nents, DMA_TO_DEVICE); host1x_bo_unpin(dc->dev, &bo->base, sgt); @@ -185,7 +186,7 @@ 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_unmap_sg(dc->dev, sgt->sgl, sgt->orig_nents, DMA_TO_DEVICE); host1x_bo_unpin(dc->dev, &bo->base, sgt);