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Mon, 4 May 2020 12:54:20 +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 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 v2 16/21] drm: host1x: fix sg_table nents vs. orig_nents misuse Date: Mon, 4 May 2020 14:53:54 +0200 Message-Id: <20200504125359.5678-16-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200504125359.5678-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSa0hTYRjHec9lO14mp2n6sixhZjfwVlEnrEioOBBYfTAiSp15UslN2bxk Gc1M06WpaXmhdHYz5/2azrupSyKtFNNSzLQPDUfB1LDUtdOZ+e33PM////x5H14CFTbiIiJc Fs3IZZIIMc8aa+pfGnK/TtYEeLUNQSpjcAChavOrccrUlI1SIws/eFRZeR9CqTt9qPmRaYSq mxnFqWHtQx6VNl/Ioyp7J/lU989ZnFrSFmFHBHRFUQWg2xfVGN1SOMmnXy5+wempOzqErn96 g/68OoPSOWOlgG4dV/Louw0aQBvrtpyyOWd9MISJCI9l5J6Hg6zDCoqpqLKNV/q047gSJG9Q ASsCknvhg5UxVAWsCSH5AsClzhLAFfMAZo6uYFxhBPC2vhesWRKXpy2DUgAz0lXrlq5HZXxW xSO9ocqg4rHsQCYD+DrDlhWh5FcEpn18j7IDe/I0/FXQirCMkW4w2fQEY1lAHoIdJbl8Ls4F ltd0mfUEYWXuF2RsZ/dAsp8PK7RqjNMchcN/niMc20O9rsHidYamlmKEMyQBOD1YyeeKdACH b+ZbHuQDJwZ/89gElNwJq7WeLELSF1Z8iuPQDo4Z/h0MNeO9pjyUawtgaoqQ27ENFuqq/qd2 v/uAckzDib5Jy31fAagpq0KzgEvhepYaAA1wYmIU0lBGsVvGxHkoJFJFjCzU42KktA6YP9Ob Vd18M9AuB/cAkgBiW8FZY3WAEJfEKuKlPQASqNhB0HzL3BKESOKvMvLIQHlMBKPoAZsITOwk 2PP4+wUhGSqJZi4zTBQjX5sihJVICVKdjR5bu3xLvdyKWgYMrUmjknZH1yp/dUrXgZO5wQZV j4aI8jM1u79VOpY02iVkXvuWIGgbGbfJ0RzT2eOJJ30TY1Kn6lvTGzaHpblO5oVjC/65i3Nz 6Wcy7fXZgTvOP1vVNLrV7VeL9EHH/e5n6QtwP3FE7aWSbNFsvLzjxD4xpgiTeO9C5QrJX4Wr HbZIAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOIsWRmVeSWpSXmKPExsVy+t/xe7o1AhviDB6et7ToPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+HLlIZPFpsfXWC0u75rDZtH5ZRabxdojd9ktDn54wmrx c9c8FgdejzXz1jB67P22gMVj56y77B7bvz1g9bjffZzJY/OSeo/b/x4ze0y+sZzRY/fNBjaP vi2rGD0+b5IL4I7SsynKLy1JVcjILy6xVYo2tDDSM7S00DMysdQzNDaPtTIyVdK3s0lJzcks Sy3St0vQy5g536JgpWjF0V03WRsYWwW7GDk5JARMJBr/PGTpYuTiEBJYyiix/dgWRoiEjMTJ aQ2sELawxJ9rXWwQRZ8YJS6vvsAEkmATMJToeguREBHoZJSY1v2RHcRhFnjFJPHhTyvYKGEB f4mZ50+CdbAIqEq0/l/MAmLzCthK7Fs4hR1ihbzE6g0HmLsYOTg4geIze9VBwkIC+RJ3n/5j mcDIt4CRYRWjSGppcW56brGhXnFibnFpXrpecn7uJkZgpGw79nPzDsZLG4MPMQpwMCrx8EZ8 Xh8nxJpYVlyZe4hRgoNZSYR3RwtQiDclsbIqtSg/vqg0J7X4EKMp0E0TmaVEk/OBUZxXEm9o amhuYWlobmxubGahJM7bIXAwRkggPbEkNTs1tSC1CKaPiYNTqoFR89Cl78Js6XOWyR9ccVXw seH3rcd/cdb1G2xfl3Wd49yvLVumr/M5tOjMUbdfvDv3+K+M2/jN60Svh8bLe0LRMarNxepJ MfOvnYuWeizhbRipGRMR0z5JzK/yuieXkcqL9RN/GBy7U+32894W0yOWOuXSRrzN/8IvpWyu XuAo5JAbpizrxzFRiaU4I9FQi7moOBEAQsJL2aoCAAA= X-CMS-MailID: 20200504125421eucas1p19cb27a8f2a795675a48c8665e20ede12 X-Msg-Generator: CA X-RootMTR: 20200504125421eucas1p19cb27a8f2a795675a48c8665e20ede12 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200504125421eucas1p19cb27a8f2a795675a48c8665e20ede12 References: <20200504125017.5494-1-m.szyprowski@samsung.com> <20200504125359.5678-1-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 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. Adapt the code to obey those rules. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v2 00/21] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/4/373 --- drivers/gpu/host1x/job.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c index a10643a..3ea185e 100644 --- a/drivers/gpu/host1x/job.c +++ b/drivers/gpu/host1x/job.c @@ -166,8 +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) { + sgt->nents = dma_map_sg(dev, sgt->sgl, sgt->orig_nents, + dir); + if (!sgt->nents) { err = -ENOMEM; goto unpin; } @@ -217,7 +218,7 @@ 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); @@ -231,7 +232,7 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job) err = iommu_map_sg(host->domain, iova_dma_addr(&host->iova, alloc), - sgt->sgl, sgt->nents, IOMMU_READ); + sgt->sgl, sgt->orig_nents, IOMMU_READ); if (err == 0) { __free_iova(&host->iova, alloc); err = -EINVAL; @@ -241,9 +242,9 @@ 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) { + sgt->nents = dma_map_sg(host->dev, sgt->sgl, + sgt->orig_nents, DMA_TO_DEVICE); + if (!sgt->nents) { err = -ENOMEM; goto unpin; } @@ -647,7 +648,7 @@ void host1x_job_unpin(struct host1x_job *job) } if (unpin->dev && sgt) - dma_unmap_sg(unpin->dev, sgt->sgl, sgt->nents, + dma_unmap_sg(unpin->dev, sgt->sgl, sgt->orig_nents, unpin->dir); host1x_bo_unpin(dev, unpin->bo, sgt);