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Fri, 19 Jun 2020 10:37:10 +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 , Mauro Carvalho Chehab , Laurent Pinchart , Kieran Bingham , linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH v7 27/36] drm: rcar-du: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:27 +0200 Message-Id: <20200619103636.11974-28-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: H4sIAAAAAAAAA0VSeyyVYRzu/W7nO+bY12Hzrpt1tmxskbT2ltxaW99fra0/NKGOfLkfnINS S4Yah8y1pBaJ5NY5HXdGGB3NnMotRhdOtSQljkIuOX3ov+d5fs+z5/d799K4uJvcRgfKIjm5 TBoioUyI2ucLur0eOd989vW32KObuhcYepqrItFqbQaO+ud+UKi0vBNDBc+c0MxgCkDJGUUC ZOgfw5BGP0iivsZ7FEpV15CoZuI7hio73grQI80ShtqmP5JuDFtxvwKwzb8KCPZu0h2S1ZQl U2zdrw8k+z5Fi7FVRdfYkRU9zmYNlQC2aTiOYtOqywA7q9l10tTT5IgfFxIYzcntXc6ZBFQP vKHCV+GlPMMSiAOLFkogpCFzAH7W1xNKYEKLmccAln8uxXliAFCvLl4nswCufhwnNiIz6nzA D0oAfK2sozYj2SPNAqOLYhygckpJGbEFcx3ArpumRowzSzi8fc/ViM2ZU7BVu4wZMcHsgQk9 8//8IsYFXn+ZKeDbrGC5uhU3YuGaPpnYRhrLIDMugDUTzSRvOgY7O3+vr2cOv2qr18M7YHdW KsEHEgAc01UKeJIKYF98LuBdTnBUt7hWTa+tZwNVjfa87A4H9O+AUYaMGRya2sofYAYza2/j vCyCSTfEvNsa5mmfbNa2verFeczCMVUFyT9QBoDTI4VUOrDK+19WAEAZsOSiFKH+nMJBxl20 U0hDFVEyf7vzYaEasPbFule0M/Vgrte3HTA0kJiK3DwmfcSkNFoRE9oOII1LLERHe7p9xCI/ acxlTh52Vh4VwinawXaakFiKHAsnvMWMvzSSC+a4cE6+McVo4bY4YG9O5i88aPBUndxNeCcE RBxCaRHpx3VVA8XH5s98Mbh23HK54hycE9twuDcsm1NZD/0saMUMfz6dcLoctX88Vu9YtzP+ apr7sPuoJZ5nuycs54Jz1x/Hca+m5RargzG2iR1Cm8qgxcYiYabVaa/G1oedsiCp2rdsS4TY 1I9LwMwkhCJA6mCLyxXSv6ZjevteAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrDIsWRmVeSWpSXmKPExsVy+t/xe7rhU9/EGez4KmbRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8elaN6NF58Ql7BZfrjxkstj0+BqrxeVdc9gsejZsZbXY +vIdk8XaI3fZLZZt+sNkcfDDE1YHAY8189Yweuz9toDFY3bHTFaPTas62Ty2f3vA6nG/+ziT x+Yl9R63/z1m9ph8Yzmjx+6bDWwefVtWMXp83iQXwBOlZ1OUX1qSqpCRX1xiqxRtaGGkZ2hp oWdkYqlnaGwea2VkqqRvZ5OSmpNZllqkb5egl7Hl6nW2gv8SFbO+/GFsYPwl0sXIySEhYCLx acN8xi5GLg4hgaWMEsffPGeFSMhInJzWAGULS/y51sUGUfSJUeLz0kawBJuAoUTXW4iEiEAn o8S07o/sIA6zQAuLxIdPD1m6GDk4hAUCJb602oE0sAioSjSf/cEGYvMK2Em0np/EDrFBXmL1 hgPMIDYnUPx1y0GwBUICthLLF7xnnsDIt4CRYRWjSGppcW56brGhXnFibnFpXrpecn7uJkZg TG079nPzDsZLG4MPMQpwMCrx8L4IeR0nxJpYVlyZe4hRgoNZSYTX6ezpOCHelMTKqtSi/Pii 0pzU4kOMpkBHTWSWEk3OB8Z7Xkm8oamhuYWlobmxubGZhZI4b4fAwRghgfTEktTs1NSC1CKY PiYOTqkGRvMJJZmnxU5bTXrwotIo7UVGH9vmjJbFDF2F7yq2JM6O7iy/8mezUNG9oBlJ8852 nOTc6Jp5s8+rtOxb37qJ4iZnWSdx/bH6k7TbfXXa/wKlpEJ25Rcb167atnNzxsKJi12fvgnh MDgSsI/hbgXrm+Ceb05KBW+mC8Y53lyfcm+x0QQfLpGTzEosxRmJhlrMRcWJAHd/wE+/AgAA X-CMS-MailID: 20200619103711eucas1p188e07cb9aaad13d39238aac4fe84b10c X-Msg-Generator: CA X-RootMTR: 20200619103711eucas1p188e07cb9aaad13d39238aac4fe84b10c X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103711eucas1p188e07cb9aaad13d39238aac4fe84b10c References: <20200619103636.11974-1-m.szyprowski@samsung.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@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. dma_map_sgtable() function returns zero or an error code, so adjust the return value check for the vsp1_du_map_sg() function. Signed-off-by: Marek Szyprowski Reviewed-by: Laurent Pinchart --- drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 3 +-- drivers/media/platform/vsp1/vsp1_drm.c | 8 ++++---- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c index f1a81c9b184d..a27bff999649 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c @@ -197,9 +197,8 @@ int rcar_du_vsp_map_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb, goto fail; ret = vsp1_du_map_sg(vsp->vsp, sgt); - if (!ret) { + if (ret) { sg_free_table(sgt); - ret = -ENOMEM; goto fail; } } diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c index a4a45d68a6ef..86d5e3f4b1ff 100644 --- a/drivers/media/platform/vsp1/vsp1_drm.c +++ b/drivers/media/platform/vsp1/vsp1_drm.c @@ -912,8 +912,8 @@ int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt) * skip cache sync. This will need to be revisited when support for * non-coherent buffers will be added to the DU driver. */ - return dma_map_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents, - DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); + return dma_map_sgtable(vsp1->bus_master, sgt, DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); } EXPORT_SYMBOL_GPL(vsp1_du_map_sg); @@ -921,8 +921,8 @@ void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt) { struct vsp1_device *vsp1 = dev_get_drvdata(dev); - dma_unmap_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents, - DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable(vsp1->bus_master, sgt, DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); } EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);