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Tue, 5 May 2020 08:46:33 +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 , Thierry Reding , linux-tegra@vger.kernel.org Subject: [PATCH v3 17/25] drm: host1x: fix common struct sg_table related issues Date: Tue, 5 May 2020 10:46:06 +0200 Message-Id: <20200505084614.30424-17-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200505084614.30424-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSWUwTURT1zXSmA1IcCwkv1UhsgiCyiPoxESGa+DFGPxSNAROKVUYglCUd dk0AAbVsUYmIDRIimwK1bEEosgpUIVRZBQEFERENiAJFMKItA/h37lneubl5BCqswUREQHAY Iw+WysS4Ka+6ffm147RtuWR/j/4wlaZ7hVDlWWqM+lt9B6X6Fr/j1JOSNoTKbXSlFvrGEapi YgCjejXZOKVYUOKUqnWUTzXPfcKoZU0O76iALs0pBXS9PpdH1ypH+fQz/RhGf0jRInRlfiw9 vDqB0hmDRYCuG4rD6fSqYkDPV+w6vfWC6RFfRhYQwcid3S+a+g+3tyGhCzBqrLALxIE/FsnA hIDkIVg3O4smA1NCSD4G8EtlG+CGBQAzdQPryjyAS1MNvI3IePoAnxOKAExQF2Cbkdr2e4jR hZMuMHkmGTdiSzIJwJdpZkYTSn5EoOJtN2oULEgP2J+iAEbMI21gV8f7tQoB6Q7r8pYAV2cN S8qa1vwmBn6iZwQ3PgTJdj6cm5xAOdNxOPQwEeewBfyqreJzeCfszEjlcYEEAMd1Kj43pALY ez1rvcIVjuhWDGnCsN9eqNY4c/QxONLfgBlpSJrDwZntRho1wLvV91GOFsBbN4Scew9Uap9u 1ja/6VlfjYa9tZr1O7YB+CC+AL8NrJX/y3IBKAZWTDgb5MewLsFMpBMrDWLDg/2cLocEVQDD f+pc1f6sAYs9l1oASQCxmcBzXi0RYtIINjqoBUACFVsKCn+VSYQCX2l0DCMP8ZGHyxi2Bewg eGIrwcFH095C0k8axgQyTCgj31ARwkQUB2S6XK+aH/FxU6KMQK1vgL9y8UxC47bQd2d1pzwk w6524FyM14qs1c08zWJyPFL1wtZuX1ModqV5xpHVnyw/oYrtnq2fta/JTlLXbtn9/LeXZ4fN zXy1wuc84lD47VrOyNJVV1FXHpF4QJ6gybTzTonSd4kwYk7x2c2hT5jmLBfzWH+piz0qZ6X/ ALsGINZLAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBIsWRmVeSWpSXmKPExsVy+t/xu7ov1TfGGWxYr2nRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8eXKQyaLTY+vsVpc3jWHzaLzyyw2i7VH7rJbHPzwhNXi 5655LA68HmvmrWH02PttAYvHzll32T22f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+6bDWwe fVtWMXp83iQXwB2lZ1OUX1qSqpCRX1xiqxRtaGGkZ2hpoWdkYqlnaGwea2VkqqRvZ5OSmpNZ llqkb5egl3H72FGmgi8SFQ+WnWVsYPwr3MXIySEhYCLxsO8aO4gtJLCUUeJCRzFEXEbi5LQG VghbWOLPtS62LkYuoJpPjBJXOz4zgyTYBAwlut5CJEQEOhklpnV/ZAdxmAVeMUl8+NPKCFIl LBAg0dR2BmwFi4CqxNlT91hAbF4BO4ndi78zQqyQl1i94QDYVE6g+ONLd9ggTiqU+HD+O+sE Rr4FjAyrGEVSS4tz03OLDfWKE3OLS/PS9ZLzczcxAmNl27Gfm3cwXtoYfIhRgINRiYc34vP6 OCHWxLLiytxDjBIczEoivMt+bIgT4k1JrKxKLcqPLyrNSS0+xGgKdNREZinR5HxgHOeVxBua GppbWBqaG5sbm1koifN2CByMERJITyxJzU5NLUgtgulj4uCUamCcqvhwo3506RkZraqqmA/z XQP8KsMdT+XOqyi4cM3g/qGT6zVtOjXU3IpD75yJrkrMEyjJFtT8K3IpdNKWP2yv3wamB0wv mHLK8IouQ7Cdx6qYeyEFXU4LLBsPBj1klFgfMd0x7FDNwgqnCR+eRF+OvnRXKN1AX17LdaeB 31aZs8+vMK1x91JiKc5INNRiLipOBADU/IzZqwIAAA== X-CMS-MailID: 20200505084633eucas1p19798e1fb42c9430a93d668bc585e58da X-Msg-Generator: CA X-RootMTR: 20200505084633eucas1p19798e1fb42c9430a93d668bc585e58da X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200505084633eucas1p19798e1fb42c9430a93d668bc585e58da References: <20200505083926.28503-1-m.szyprowski@samsung.com> <20200505084614.30424-1-m.szyprowski@samsung.com> Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 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 the 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. A common mistake was to ignore a result of the dma_map_sg function and don't use the sg_table->orig_nents at all. To avoid such issues, lets use common dma-mapping wrappers operating directly on the struct sg_table objects and adjust references to the nents and orig_nents respectively. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v3 00/25] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/5/187 --- drivers/gpu/host1x/job.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c index a10643a..850115e 100644 --- a/drivers/gpu/host1x/job.c +++ b/drivers/gpu/host1x/job.c @@ -166,11 +166,9 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job) goto unpin; } - err = dma_map_sg(dev, sgt->sgl, sgt->nents, dir); - if (!err) { - err = -ENOMEM; + err = dma_map_sgtable(dev, sgt, dir); + if (err) goto unpin; - } job->unpins[job->num_unpins].dev = dev; job->unpins[job->num_unpins].dir = dir; @@ -217,7 +215,7 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job) } if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && host->domain) { - for_each_sg(sgt->sgl, sg, sgt->nents, j) + for_each_sg(sgt->sgl, sg, sgt->orig_nents, j) gather_size += sg->length; gather_size = iova_align(&host->iova, gather_size); @@ -229,9 +227,9 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job) goto unpin; } - err = iommu_map_sg(host->domain, + err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc), - sgt->sgl, sgt->nents, IOMMU_READ); + sgt, IOMMU_READ); if (err == 0) { __free_iova(&host->iova, alloc); err = -EINVAL; @@ -241,12 +239,9 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job) job->unpins[job->num_unpins].size = gather_size; phys_addr = iova_dma_addr(&host->iova, alloc); } else if (sgt) { - err = dma_map_sg(host->dev, sgt->sgl, sgt->nents, - DMA_TO_DEVICE); - if (!err) { - err = -ENOMEM; + err = dma_map_sgtable(host->dev, sgt, DMA_TO_DEVICE); + if (err) goto unpin; - } job->unpins[job->num_unpins].dir = DMA_TO_DEVICE; job->unpins[job->num_unpins].dev = host->dev; @@ -647,8 +642,7 @@ void host1x_job_unpin(struct host1x_job *job) } if (unpin->dev && sgt) - dma_unmap_sg(unpin->dev, sgt->sgl, sgt->nents, - unpin->dir); + dma_unmap_sgtable(unpin->dev, sgt, unpin->dir); host1x_bo_unpin(dev, unpin->bo, sgt); host1x_bo_put(unpin->bo);