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Wed, 26 Aug 2020 06:35:32 +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 09/32] drm: lima: fix common struct sg_table related issues Date: Wed, 26 Aug 2020 08:32:53 +0200 Message-Id: <20200826063316.23486-10-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: H4sIAAAAAAAAA+NgFtrGKsWRmVeSWpSXmKPExsWy7djPc7pbmdziDW4/krLoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+DxvE5vFlysPmSw2Pb7GanF51xw2i7VH7rJbHPzwhNXi w9qvTA68HmvmrWH02PttAYvHzll32T22f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+6bDWwe fVtWMXp83iQXwB3FZZOSmpNZllqkb5fAlXHg+X/GgntSFe8PhTQwzhPrYuTkkBAwkViwdAlb FyMXh5DACkaJs0+msUA4XxglTm89xgzhfGaUWLH4PBtMy4R5P6CqljNK3Lw2kwmu5c+LZSwg VWwChhJdb7vAOkQEWhklTvTygBQxC1xmkph/tAmsSFggQOJB3xZGEJtFQFXiz989TCA2r4Cd xKL50xgh1slLrN5wgBnE5gSKH+/uB7tWQuAYu8SiJ79ZIIpcJBa3rGOFsIUlXh3fwg5hy0j8 3zmfCaKhmVHi4bm17BBOD6PE5aYZUCusJe6c+wU0lgPoPk2J9bv0IcKOEjueXGQCCUsI8Enc eCsIEmYGMidtm84MEeaV6GgTgqhWk5h1fB3c2oMXLkGVeEjM6IQG0ERGiXV7ZzBNYJSfhbBr ASPjKkbx1NLi3PTUYsO81HK94sTc4tK8dL3k/NxNjMDUdPrf8U87GL9eSjrEKMDBqMTDu4DN NV6INbGsuDL3EKMEB7OSCK/T2dNxQrwpiZVVqUX58UWlOanFhxilOViUxHmNF72MFRJITyxJ zU5NLUgtgskycXBKNTAu6WjRmvOsnOOzzrs2TtlIxby0KQfNPCyCLqwKPruWfbWAzMx69an1 8wr6HnyxCfHirmRbaNTXEnZYQ029fXPyk2ihJMf8BF25ThE/Zq8lZ9j8jbdKTJdc/iz5GdfL xV/2L1j+Xe74QqcW991d7+PuTjcLnMSaXmDWH99+d486Y9GdhBusAUosxRmJhlrMRcWJAACn CqBJAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBIsWRmVeSWpSXmKPExsVy+t/xe7pbmNziDS6+t7HoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+DxvE5vFlysPmSw2Pb7GanF51xw2i7VH7rJbHPzwhNXi w9qvTA68HmvmrWH02PttAYvHzll32T22f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+6bDWwe fVtWMXp83iQXwB2lZ1OUX1qSqpCRX1xiqxRtaGGkZ2hpoWdkYqlnaGwea2VkqqRvZ5OSmpNZ llqkb5egl3Hg+X/GgntSFe8PhTQwzhPrYuTkkBAwkZgw7wdLFyMXh5DAUkaJ3UfusEAkZCRO TmtghbCFJf5c62KDKPrEKHGyYScjSIJNwFCi6y1EQkSgk1FiWvdHdhCHWeA2k8SZuROYQaqE Bfwk/v5+CzaWRUBV4s/fPUwgNq+AncSi+dMYIVbIS6zecACsnhMofry7nw3EFhKwlTi9dgbz BEa+BYwMqxhFUkuLc9Nzi430ihNzi0vz0vWS83M3MQJjZduxn1t2MHa9Cz7EKMDBqMTDu4DN NV6INbGsuDL3EKMEB7OSCK/T2dNxQrwpiZVVqUX58UWlOanFhxhNgY6ayCwlmpwPjOO8knhD U0NzC0tDc2NzYzMLJXHeDoGDMUIC6YklqdmpqQWpRTB9TBycUg2Ml5zsefnybwseP/ZzyRv9 nTrPr/cc3bD9wq622iLfZElOO7eahrf5f7z+c4j++j230eqHZs8l7wkzXidOejjpfjRTCsOf 2cL3hGs+T+jITFHoSdrYoWE5x+v9ifOTL0z+XaSZLSmwrualmcwMwX8TvAvnn6vyNtwst+/g zaM/JDTTvJIi2XwdlFiKMxINtZiLihMB2n060qsCAAA= X-CMS-MailID: 20200826063533eucas1p1e346ac4a683f929be8adc344b3fe9ea0 X-Msg-Generator: CA X-RootMTR: 20200826063533eucas1p1e346ac4a683f929be8adc344b3fe9ea0 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200826063533eucas1p1e346ac4a683f929be8adc344b3fe9ea0 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: 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)