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Tue, 5 May 2020 08:46:27 +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 v3 08/25] drm: lima: fix common struct sg_table related issues Date: Tue, 5 May 2020 10:45:57 +0200 Message-Id: <20200505084614.30424-8-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: H4sIAAAAAAAAA0WSe0hTYRjG+c7Zzo7T6WlKflgoDEoUUmcRB7x0wT8OBGElFELaKU9Tc3Oc qWWBTkPNqWVZaiJmUt7nZV6biDqcKyQzldC85A1hgmipQyW0zaP23+99vuf53vd7+XBU3MF3 w2MUCQyroOMkmJDXPrA9dGbRsznCL9/iTeYNfUHI5uJGPrnX/hIlxzZXMbKmzoiQ5T0B5HqZ DiM3xuYQUrfwg0+O6ksxUts/LSD71hb55Jp2E7koourL6gHVbSnnUZ9KpgVUh2WWT/3KMSFU y4dUanJ3AaUKxqsA1TWhxqjnrbWAWte5h9qHCwOjmLiYJIb1Db4jjJ6frOYrC50ezY7qgBqM OWiAHQ6Jc7DX+BPRACEuJqoB3FwuBFyxAeDan3kBV6wD2JVpAYeR6vbvPBuLiSoAa3fvHyWy dl7vmzBCCjUrGszGLkQGgJ/zHGwmlBhF4Dtj+n7amQiFs/061MY84hTMLP62r4uIIFjU/5XH dfOAdU29+x47IhgujExhtosgMSCAaVn1B6YQ2FnehXHsDJdNrQKOT8LBglweF3gK4NyQVsAV uQCOphcfPCgATg3tWNO4dT4v2Kj35eRLsHU5W2CTIeEIx1eO2WTUiq/ai1BOFsFnmWLOfRqW mBqO2vYNj6AcU9CsNaDchozWNWbsIfnAo+R/s3IAaoErk6iSyxiVv4J56KOi5apEhcznXrxc B6zfaXDXtNEJ9H/vGgCBA4mD6NZ6Y4SYTyepkuUGAHFU4iKq3GqKEIui6OTHDBsfySbGMSoD OIHzJK6isxXm22JCRicwDxhGybCHpwhu56YGN97HXjM5tWSmhdkNpKbNOHdKj5vxAFfWk/6Y 3zYBt52cNPbXPeb0gUuRITm/0zwGYv2yUuxLey6z41jlzTDzXo1yiR1uerPQ8Fa2qnW82lyh 3NYlaWmv7CDvmZRCRXjredOLJ+qeRkWuv+XCUnGkWbo1X38FKeh+31bkPimW8FTRtNQbZVX0 PyYwgkBKAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJIsWRmVeSWpSXmKPExsVy+t/xu7pP1DfGGfT/E7PoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+DxvE5vFlysPmSw2Pb7GanF51xw2i7VH7rJbHPzwhNXi w9qvTA68HmvmrWH02PttAYvHzll32T22f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+6bDWwe fVtWMXp83iQXwB2lZ1OUX1qSqpCRX1xiqxRtaGGkZ2hpoWdkYqlnaGwea2VkqqRvZ5OSmpNZ llqkb5egl/Ho9grWgmn8FQ8ub2JsYLzC08XIySEhYCKxYttFli5GLg4hgaWMEgvvTWeBSMhI nJzWwAphC0v8udbFBlH0iVHi9d8rbCAJNgFDia63EAkRgU5GiWndH9lBHGaB20wSZ+ZOYAap Ehbwk3gz9TDYKBYBVYm2GefBVvAK2EpMP3IWap28xOoNB8DqOQXsJB5fugO2QUigUOLD+e+s Exj5FjAyrGIUSS0tzk3PLTbSK07MLS7NS9dLzs/dxAiMlm3Hfm7Zwdj1LvgQowAHoxIP74av 6+OEWBPLiitzDzFKcDArifAu+7EhTog3JbGyKrUoP76oNCe1+BCjKdBRE5mlRJPzgZGcVxJv aGpobmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qBceeCJq5nT17F9/AnKJjG L6y8tjFAUiyh/WtYpuOq1qNXC//Frsk/q8zrMp3n07r3qw0Xv2O4PF97/xEle/nil14iRpKt s/Tu2x87XnHL/pm+80aRWwGzZ36/LbSA4Uzyh6uKTmIbOtI/NCmk7JgWqRPs0Zr4r18vJlM3 1lJN8LOYbKhNUpGoEktxRqKhFnNRcSIAx1ExtawCAAA= X-CMS-MailID: 20200505084628eucas1p2c87aae2f471b716675559debbf680c46 X-Msg-Generator: CA X-RootMTR: 20200505084628eucas1p2c87aae2f471b716675559debbf680c46 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200505084628eucas1p2c87aae2f471b716675559debbf680c46 References: <20200505083926.28503-1-m.szyprowski@samsung.com> <20200505084614.30424-1-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 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/drm/lima/lima_gem.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 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/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c index 5404e0d..fca359d 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); 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); + if (ret) { + sg_free_table(&sgt); + kfree(bo->base.sgt); + bo->base.sgt = NULL; + return ret; + } *bo->base.sgt = sgt;