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Thu, 18 Jun 2020 15:40:20 +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 Subject: [PATCH v6 10/36] drm: lima: fix common struct sg_table related issues Date: Thu, 18 Jun 2020 17:39:31 +0200 Message-Id: <20200618153956.29558-11-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200618153956.29558-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSe0hTYRjG+c7Z2Y6XxWmafixJGiSUeE3hhCUmIuefQDIwAi8zTyrpJjtq GpSiGDovZJm3TEdI5mWbN2YqTl3pDHHaFDXTvBVhYlpeQgNtp6P23+97n/d5n5eXD0dF7ZgY j5cl0wqZNEHCt+bpBndH3b4qVyM8l5qtyELTe4RsKddi5IGuGCUnttf5ZH3jAEKqev3IzepW Prk1sYiQrcuTGDneVcUn1e/mBGT/xheM3FBvIwFCqqm6CVA9Oyoe1Vk5J6A6dhYwaj7fiFBt tRnUp/1llHo6XQeo7o+ZfKqovQFQm61nQmxuWV+OoRPiU2mFh3+UdVzftwOQ9Fmctm64kQmq HZTACoeED/wwlcdTAmtcRLwGsKVqFmMFEbEFoL4+nhM2AdzfKwJHjr69PQEn1AHYpq8XHDvy Rq+xzCe8oHJNyWfZnsgBcKjQljWgxDgCawayeKxgR4TABa0BYZlHnIPdJv2/aCHhD7M0pRiX 5gwbm/tQlq0s9WFjDsYOgoReAItMWgHXFAQ1k+bD9ezgd2P7Yd0JHnTWIJwhG8BFk1rAPQoA HM8qP3T4wVnTnmVX3LLfeajt8mAREldh9poXhyfg9NpJthm14BNdGcqVhTD3kYib4QIrjZrj 1P4xM8oxBXd+zmDcsYoBLO8rRx8D58r/WSoAGoAjncIkxtKMl4y+585IE5kUWaz7bXliK7D8 peF94683YNscbQAEDiS2woCw1QgRJk1l0hMNAOKoxF4YODIcIRLGSNPv0wp5pCIlgWYM4DTO kzgKL75cCRcRsdJk+i5NJ9GKIxXBrcSZoHHqiuelukEHeVf07+mcah6tzY0vDvft3akzE+Nh HeDOVBm5EhksTlOJSyvzU8eY0Iie+bY/jbXGghmdPnO35Pq6MqgiMAoZan+FSm7uFp8Fg8G7 Tipfh4KHuldyl1MVz0LVNqqMkn3Xtz6y5z+8FQ/cvJtLXUcWNUstzNwLCY+Jk3pdQBWM9C8J 2LnwRwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBIsWRmVeSWpSXmKPExsVy+t/xu7pPul7HGaw+YWDRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8XneJjaLL1ceMllsenyN1eLyrjlsFmuP3GW3OPjhCavF h7VfmRx4PdbMW8PosffbAhaPnbPusnts//aA1eN+93Emj81L6j1u/3vM7DH5xnJGj903G9g8 +rasYvT4vEkugDtKz6Yov7QkVSEjv7jEVina0MJIz9DSQs/IxFLP0Ng81srIVEnfziYlNSez LLVI3y5BL+PA8/+MBfekKt4fCmlgnCfWxcjJISFgInHg1y/2LkYuDiGBpYwS/+f/YYFIyEic nNbACmELS/y51sUGUfSJUaLtzn1mkASbgKFE11uIhIhAJ6PEtO6PYKOYBW4zSZyZOwGsSljA T+LyhB1gNouAqsTuc/vAxvIK2Ek0rZsGtUJeYvWGA2A1nEDx08dbweJCArYSzz+0sU1g5FvA yLCKUSS1tDg3PbfYUK84Mbe4NC9dLzk/dxMjMFa2Hfu5eQfjpY3BhxgFOBiVeHhfhLyOE2JN LCuuzD3EKMHBrCTC63T2dJwQb0piZVVqUX58UWlOavEhRlOgoyYyS4km5wPjOK8k3tDU0NzC 0tDc2NzYzEJJnLdD4GCMkEB6YklqdmpqQWoRTB8TB6dUA2Ol0V+BnQV3OrQXPzj2UYtL5IYE zyU5w6/+vWp5ipUpUmfybNOObTcRLGc8eKOU/X+ep0vKQ6aPMWxhuxc5tBpNKZrYHvHLT/eR yIXj8hO/qR80LXXr9Ha59KTJTr65WERk/4FEq5L4H+/cPh2YtsW6+OPdk+Ep3YuW8LV4t19b kSZwg/vQGSWW4oxEQy3mouJEAHJLSFCrAgAA X-CMS-MailID: 20200618154020eucas1p2d823db666c8706f63ed352fee3c3c90c X-Msg-Generator: CA X-RootMTR: 20200618154020eucas1p2d823db666c8706f63ed352fee3c3c90c X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200618154020eucas1p2d823db666c8706f63ed352fee3c3c90c References: <20200618153956.29558-1-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: lima@lists.freedesktop.org, Bartlomiej Zolnierkiewicz , David Airlie , Qiang Yu , 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: Qiang Yu --- drivers/gpu/drm/lima/lima_gem.c | 11 ++++++++--- drivers/gpu/drm/lima/lima_vm.c | 5 ++--- 2 files changed, 10 insertions(+), 6 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/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c index 155f2b4b4030..11223fe348df 100644 --- a/drivers/gpu/drm/lima/lima_gem.c +++ b/drivers/gpu/drm/lima/lima_gem.c @@ -69,8 +69,7 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm) return ret; if (bo->base.sgt) { - dma_unmap_sg(dev, bo->base.sgt->sgl, - bo->base.sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(dev, bo->base.sgt, DMA_BIDIRECTIONAL, 0); sg_free_table(bo->base.sgt); } else { bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL); @@ -80,7 +79,13 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm) } } - dma_map_sg(dev, sgt.sgl, sgt.nents, DMA_BIDIRECTIONAL); + ret = dma_map_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0); + if (ret) { + sg_free_table(&sgt); + kfree(bo->base.sgt); + bo->base.sgt = NULL; + return ret; + } *bo->base.sgt = sgt; diff --git a/drivers/gpu/drm/lima/lima_vm.c b/drivers/gpu/drm/lima/lima_vm.c index 5b92fb82674a..2b2739adc7f5 100644 --- a/drivers/gpu/drm/lima/lima_vm.c +++ b/drivers/gpu/drm/lima/lima_vm.c @@ -124,7 +124,7 @@ int lima_vm_bo_add(struct lima_vm *vm, struct lima_bo *bo, bool create) if (err) goto err_out1; - for_each_sg_dma_page(bo->base.sgt->sgl, &sg_iter, bo->base.sgt->nents, 0) { + for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, 0) { err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter), bo_va->node.start + offset); if (err) @@ -298,8 +298,7 @@ int lima_vm_map_bo(struct lima_vm *vm, struct lima_bo *bo, int pageoff) mutex_lock(&vm->lock); base = bo_va->node.start + (pageoff << PAGE_SHIFT); - for_each_sg_dma_page(bo->base.sgt->sgl, &sg_iter, - bo->base.sgt->nents, pageoff) { + for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, pageoff) { err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter), base + offset); if (err)