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Tue, 12 May 2020 09:01:11 +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 v4 09/38] drm: etnaviv: fix common struct sg_table related issues Date: Tue, 12 May 2020 11:00:29 +0200 Message-Id: <20200512090058.14910-9-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200512090058.14910-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrEKsWRmVeSWpSXmKPExsWy7djP87o3UnfFGczdqGrRe+4kk8XGGetZ Lf5vm8hsceXrezaLXTPusFusXH2UyWLBfmuLB3NvMll8ufKQyWLT42usFpd3zWGzWHvkLrvF wQ9PWB14PdbMW8PosffbAhaP7d8esHrc7z7O5LF5Sb3H7X+PmT0m31jO6LH7ZgObR/9fA4++ LasYPT5vkgvgjuKySUnNySxLLdK3S+DKeLyljaVgpWrFth+SDYyr5LsYOTkkBEwk3vz5wNbF yMUhJLCCUeLjkuPMEM4XRokjvUtZQaqEBD4zSrxcrgrT8fbROSaIouWMEptfPGOH67gwbycj SBWbgKFE19suNhBbRKCVUeJELw+IzSxwn0ni98ssEFtYIFjifscssA0sAqoSl2f8ZwaxeQVs JXbe/sEMsU1eYvWGA2A2p4CdxP35f1i6GDmA4ofYJa65Q5S4SMz6c4cJwhaWeHV8CzuELSPx f+d8sEMlBJoZJR6eW8sO4fQwSlxumsEIUWUtcefcLzaQocwCmhLrd+lDhB0l9l9fzwyxi0/i xltBiPP5JCZtmw4V5pXoaBOCqFaTmHV8HdzagxcuQV3vIfFh7Q5WSPAcZZS4+fM60wRG+VkI yxYwMq5iFE8tLc5NTy02zEst1ytOzC0uzUvXS87P3cQITEmn/x3/tIPx66WkQ4wCHIxKPLwd RjvjhFgTy4orcw8xSnAwK4nwtmQChXhTEiurUovy44tKc1KLDzFKc7AoifMaL3oZKySQnliS mp2aWpBaBJNl4uCUamBU4V52qXV6t2v3FWUhS7/kHeHqH1UueGudCdjY/GqKyPYVGef2Lj71 7rKl3oMdyyqnHPmg/OCoY3r0N+OQTXzGqQYvz9hymWs8V/H6feLm5gS7thn6G05M88lvbue+ tKPC8MD866fjjePEOjcvyfWXra0zTXoffT1uxiL2v2qWOTnSphusDZYrsRRnJBpqMRcVJwIA aA/0ckUDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprGIsWRmVeSWpSXmKPExsVy+t/xu7o3UnfFGUw5JmTRe+4kk8XGGetZ Lf5vm8hsceXrezaLXTPusFusXH2UyWLBfmuLB3NvMll8ufKQyWLT42usFpd3zWGzWHvkLrvF wQ9PWB14PdbMW8PosffbAhaP7d8esHrc7z7O5LF5Sb3H7X+PmT0m31jO6LH7ZgObR/9fA4++ LasYPT5vkgvgjtKzKcovLUlVyMgvLrFVija0MNIztLTQMzKx1DM0No+1MjJV0rezSUnNySxL LdK3S9DLeLyljaVgpWrFth+SDYyr5LsYOTkkBEwk3j46x9TFyMUhJLCUUeLz1Z/sEAkZiZPT GlghbGGJP9e62CCKPjFKLLnzkgkkwSZgKNH1FiIhItDJKDGt+yNYN7PAcyaJly36ILawQKDE rH2TwCaxCKhKXJ7xnxnE5hWwldh5+wczxAZ5idUbDoDZnAJ2Evfn/2EBsYUECiUeXX3LMoGR bwEjwypGkdTS4tz03GJDveLE3OLSvHS95PzcTYzAONl27OfmHYyXNgYfYhTgYFTi4e0w2hkn xJpYVlyZe4hRgoNZSYS3JRMoxJuSWFmVWpQfX1Sak1p8iNEU6KiJzFKiyfnAGM4riTc0NTS3 sDQ0NzY3NrNQEuftEDgYIySQnliSmp2aWpBaBNPHxMEp1cAYaqlhXR7mvX3LzHNiiSmKayft qRYR8ThorerwQ7o60iSE0V/2sg6X0lfNF3Uz/dlWb9oe/7lra9LGhshbWp0XZ8cJLeWbGKwR sWj7Yq2Z8yUl33PGzi2btddo8hy3dqZzea0yf/3nfxd6cOpt3rQt1cxJm9LWnft/aEqEyb7J S29V5t7VituvxFKckWioxVxUnAgAYmQcx6kCAAA= X-CMS-MailID: 20200512090112eucas1p225de9f54f7fd54346043fc8c31e7ea2d X-Msg-Generator: CA X-RootMTR: 20200512090112eucas1p225de9f54f7fd54346043fc8c31e7ea2d X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200512090112eucas1p225de9f54f7fd54346043fc8c31e7ea2d References: <20200512085710.14688-1-m.szyprowski@samsung.com> <20200512090058.14910-1-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 , etnaviv@lists.freedesktop.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 --- For more information, see '[PATCH v4 00/38] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lore.kernel.org/dri-devel/20200512085710.14688-1-m.szyprowski@samsung.com/T/ --- drivers/gpu/drm/etnaviv/etnaviv_gem.c | 12 +++++------- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 13 +++---------- 2 files changed, 8 insertions(+), 17 deletions(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c index dc9ef30..cc50c7b 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c @@ -27,7 +27,7 @@ static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) * because display controller, GPU, etc. are not coherent. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) - dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); + dma_map_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); } static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) @@ -51,7 +51,7 @@ static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj * discard those writes. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) - dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); } /* called with etnaviv_obj->lock held */ @@ -404,9 +404,8 @@ int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, } if (etnaviv_obj->flags & ETNA_BO_CACHED) { - dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, - etnaviv_obj->sgt->nents, - etnaviv_op_to_dma_dir(op)); + dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt, + etnaviv_op_to_dma_dir(op)); etnaviv_obj->last_cpu_prep_op = op; } @@ -421,8 +420,7 @@ int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) if (etnaviv_obj->flags & ETNA_BO_CACHED) { /* fini without a prep is almost certainly a userspace error */ WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); - dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, - etnaviv_obj->sgt->nents, + dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt, etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); etnaviv_obj->last_cpu_prep_op = 0; } diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c index 3607d34..13b1005 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -79,7 +79,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, if (!context || !sgt) return -EINVAL; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { + for_each_sgtable_dma_sg(sgt, sg, i) { u32 pa = sg_dma_address(sg) - sg->offset; size_t bytes = sg_dma_len(sg) + sg->offset; @@ -95,14 +95,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, return 0; fail: - da = iova; - - for_each_sg(sgt->sgl, sg, i, j) { - size_t bytes = sg_dma_len(sg) + sg->offset; - - etnaviv_context_unmap(context, da, bytes); - da += bytes; - } + etnaviv_context_unmap(context, iova, da - iova); return ret; } @@ -113,7 +106,7 @@ static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova, unsigned int da = iova; int i; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { + for_each_sgtable_dma_sg(sgt, sg, i) { size_t bytes = sg_dma_len(sg) + sg->offset; etnaviv_context_unmap(context, da, bytes);