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Fri, 19 Jun 2020 10:37:01 +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 , Rob Clark , Sean Paul , linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org Subject: [PATCH v7 13/36] drm: msm: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:13 +0200 Message-Id: <20200619103636.11974-14-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: H4sIAAAAAAAAA0VSa0hTYRjmO2eXo7g6TdEPk6xpUUFesMtXhtkNTn8yqD8GmStPam1TNrUM ItEKm068UI0pZWVq3lObqZg5nTNk8zbNLNNlpeU1b5mJtnlm/Xve5/I+Lx8fgfOb2c5EuCSK lkqEIgHHlqVu/m3YdfLeWJCXMsUNKQxvMfRCWcpGK+o0HBnnJjkoa1gP0PNCLYay633RrNGE ofKhHjZKq9dzUVdNFgcVN/Vz0fDjBRw1TH1ho/6MJuC/nip6WASouvlsFlWt6udSVfODbGog SYdRFTk3qQ/LQziV0ZsHqNr3cRxKV9PHpVIqCwA1U77plN1Z24MhtCg8hpZ6+gXbhmV1VLAj VYJrqXotFgf0LnJgQ0ByNxzOLMbkwJbgk/kAlswmAYvAJ2cBzHwZyAgzAOaXaMBaIslgAIyQ B6Dq/mecGcyJ8YQ53OLikN5QPi7nWLADeRvAFoWdxYSTKhyOaP6sCvZkAFTmajALZpFbYXqj ZpXnkX4wvlpvrXOFhWVvVpfamPnRWw1syyJI9nHhu8FnGGM6BrsztFZsD3/oKrkMdoGtGcks JpAAoMlQzGWGZAC74pXWCl/40bBoribM9+2ApTWeDH0YKjuMXAsNyXWwd3yDhcbNMF39AGdo Hky8w2fc26BKV/KvtqG9E2cwBXvaFNYHTgMwPVnNSgWuqv9l2QAUACc6WiYOpWU+Evqqh0wo lkVLQj0uRojLgfl3tS7r5l6B10sXNIAkgMCON3JmNIjPFsbIYsUaAAlc4MA7om8N4vNChLHX aWnEeWm0iJZpwEaCJXDi+Tz5fo5Phgqj6Cs0HUlL11SMsHGOA3d1fZK+R8FdZUUFIalpg017 pB5JXitfL4kCpy4rkVFuOjHtaNrcGzARNmU/Muc3HfGrYswdfdr/M+C0i58bZ8SxVfT0+EQk 2Ku3cW9pzDrQZrf9m6GuwXtpcV+TUrvcreksNE5V1zYqDhVrJ2eq0v1Dmo+2CxO3LNwYyJ2f EeQIWLIwofdOXCoT/gW9h8I/WQMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBIsWRmVeSWpSXmKPExsVy+t/xe7q+U9/EGbw/Z2nRe+4kk8XGGetZ Lf5vm8hsceXrezaLOc/PMlqsXH2UyWLBfmuLL1ceMllsenyN1WLi/rPsFpd3zWGzWHvkLrvF 84U/mC0OfnjCanF38hFGB36PNfPWMHrs/baAxWPnrLvsHtu/PWD1uN99nMlj85J6j9v/HjN7 TL6xnNFj980GNo/ju26xe/RtWcXo8XmTXABPlJ5NUX5pSapCRn5xia1StKGFkZ6hpYWekYml nqGxeayVkamSvp1NSmpOZllqkb5dgl7GnIubWQtmKVVMOHuUqYHxrEwXIyeHhICJRPe5c4xd jFwcQgJLGSUmX/rKCJGQkTg5rYEVwhaW+HOtiw2i6BOjxMldD5lBEmwChhJdbyESIgKdjBLT uj+ygzjMAkuYJfqmXmIDqRIW8JXYffk7WAeLgKrEpMOHwOK8AnYSTTvPQq2Tl1i94QBYDSdQ /HXLQbDVQgK2EssXvGeewMi3gJFhFaNIamlxbnpusZFecWJucWleul5yfu4mRmAsbTv2c8sO xq53wYcYBTgYlXh4X4S8jhNiTSwrrsw9xCjBwawkwut09nScEG9KYmVValF+fFFpTmrxIUZT oKMmMkuJJucD4zyvJN7Q1NDcwtLQ3Njc2MxCSZy3Q+BgjJBAemJJanZqakFqEUwfEwenVAOj 23eX5T1rOq/pTc2681JoufTxmvWur2/Na2eUVjV0m239VKaf6Y8mg3gX011lacM5X4znh0yw /nNge0le9tVi/dRVFmdDr901nOay//X7ZU/OnDnQ9OX88Sl3xIz37s5XWsPO/NLe+Nqfz/Wh 4QbxRdflt6VPdxVIvC1YefPk7/n3lVUPaWwTV2Ipzkg01GIuKk4EAHK7XDC7AgAA X-CMS-MailID: 20200619103702eucas1p1c57147013bbac3968f6ba073caec68b5 X-Msg-Generator: CA X-RootMTR: 20200619103702eucas1p1c57147013bbac3968f6ba073caec68b5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103702eucas1p1c57147013bbac3968f6ba073caec68b5 References: <20200619103636.11974-1-m.szyprowski@samsung.com> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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/msm/msm_gem.c | 13 +++++-------- drivers/gpu/drm/msm/msm_gpummu.c | 14 ++++++-------- drivers/gpu/drm/msm/msm_iommu.c | 2 +- 3 files changed, 12 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 38b0c0e1f83e..e0d5fd36ea8f 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -53,11 +53,10 @@ static void sync_for_device(struct msm_gem_object *msm_obj) struct device *dev = msm_obj->base.dev->dev; if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) { - dma_sync_sg_for_device(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_sync_sgtable_for_device(dev, msm_obj->sgt, + DMA_BIDIRECTIONAL); } else { - dma_map_sg(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_map_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0); } } @@ -66,11 +65,9 @@ static void sync_for_cpu(struct msm_gem_object *msm_obj) struct device *dev = msm_obj->base.dev->dev; if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) { - dma_sync_sg_for_cpu(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_sync_sgtable_for_cpu(dev, msm_obj->sgt, DMA_BIDIRECTIONAL); } else { - dma_unmap_sg(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0); } } diff --git a/drivers/gpu/drm/msm/msm_gpummu.c b/drivers/gpu/drm/msm/msm_gpummu.c index 310a31b05faa..319f06c28235 100644 --- a/drivers/gpu/drm/msm/msm_gpummu.c +++ b/drivers/gpu/drm/msm/msm_gpummu.c @@ -30,21 +30,19 @@ static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova, { struct msm_gpummu *gpummu = to_msm_gpummu(mmu); unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE; - struct scatterlist *sg; + struct sg_dma_page_iter dma_iter; unsigned prot_bits = 0; - unsigned i, j; if (prot & IOMMU_WRITE) prot_bits |= 1; if (prot & IOMMU_READ) prot_bits |= 2; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - dma_addr_t addr = sg->dma_address; - for (j = 0; j < sg->length / GPUMMU_PAGE_SIZE; j++, idx++) { - gpummu->table[idx] = addr | prot_bits; - addr += GPUMMU_PAGE_SIZE; - } + for_each_sgtable_dma_page(sgt, &dma_iter, 0) { + dma_addr_t addr = sg_page_iter_dma_address(&dma_iter); + + BUILD_BUG_ON(GPUMMU_PAGE_SIZE != PAGE_SIZE); + gpummu->table[idx++] = addr | prot_bits; } /* we can improve by deferring flush for multiple map() */ diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c index 3a381a9674c9..6c31e65834c6 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -36,7 +36,7 @@ static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova, struct msm_iommu *iommu = to_msm_iommu(mmu); size_t ret; - ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot); + ret = iommu_map_sgtable(iommu->domain, iova, sgt, prot); WARN_ON(!ret); return (ret == len) ? 0 : -EINVAL;