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Thu, 18 Jun 2020 15:40:29 +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 v6 24/36] xen: gntdev: fix common struct sg_table related issues Date: Thu, 18 Jun 2020 17:39:45 +0200 Message-Id: <20200618153956.29558-25-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200618153956.29558-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSe0hTcRTH++3eu13NyW2a/rBQGCUVpan746JhJkGXHhQRRKHm0osz3bTN Z5SKNpP5SBNRRM1e+JrPrWWKppbNR77NfKam0sPMt6GJtXnV/vuc7znfcw6HgyO8RswC95UE 0VKJ0J/PNkQ171c7jv1STHsc/7DmSCa2N7PI8oxSjOxKl6PkX00KQvYuz7LJgqJGFpn7xonM GrAnl3rHWWTFRB9G9lRlscnidyMcsn5uEiN/q1NZLsaUMkcJqJqVXJR6tTKGUaPxWhaleh5J DW1MIFRqfx6g3s71olT1QBSbmp8aRKkkdSGgStUfUWqxwvIS97rhCW/a3zeElto6exqKytvm WYEtZmGz6mo0Cqh5CmCAQ0IAc3RWPfOIfADnP51RAEMdLwH4omsaZYJFADuepWPbjsUFOYdJ 5AGo1MSxdizZ6prNXmzCDipmFGw9mxJyAJsSjfRFCBGPwLTiws1WJsRlGN8fC/SMEgdhSsrP TeYSzrA8qQ9lxlnBorI6RM8GOr1VK8f0jSAxyIFPhtIQpug0fPh6hs2wCfyhVXMY3g9bUxNQ xhAD4Hh7MYcJEgDsic4ATJUTHG5f07lx3X6HYWmVLSOfgi9nhoFehoQx7J/Zo5cRHT7SpCOM zIVxsVuHtIaZ2pKdsfWd3VurUbB2ugxjLpQCYMJoCZIMrDL/D8sFoBCY08EysQ8ts5fQoTYy oVgWLPGx8QoQVwDdc7VuaJcqQdX6zQZA4IBvxP12ZdqDhwlDZOHiBgBxhG/KdW1r9eBxvYXh d2hpwA1psD8tawD7cJRvznV4+t2dR/gIg2g/mg6kpdtZFm5gEQXonnXRwtTcOeerXyQe7uGP LxzYvRoa4TB3zy3S3lLsd79TSXiV1gyJBPIxpWPMsqV4UTqpOOvabBbR7fUn7S7+VbDqMnJN ELZwaKnukudF6/p5T5+uZteVW7NVvkfdKgv25kcn396VLFLVkCreyc/2ti2Z4mxVkyCjtvxB c/7IeT4qEwntjiBSmfAftXBXYVgDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOIsWRmVeSWpSXmKPExsVy+t/xu7rvul7HGWy/oGjRe+4kk8XGGetZ LS5Ob2Wx+L9tIrPFla/v2SxWrj7KZLFgv7XFnJtGFl+uPGSy2PT4GqvF5V1z2CzWHrnLbnHw wxNWi+9bJjM58HmsmbeG0WPvtwUsHtu/PWD1uN99nMlj85J6j9v/HjN7TL6xnNHj8IcrLB67 bzaweXx8eovFo2/LKkaP9Vuusnh83iQXwBulZ1OUX1qSqpCRX1xiqxRtaGGkZ2hpoWdkYqln aGwea2VkqqRvZ5OSmpNZllqkb5egl7Hx7EemglNiFe+37GZpYNwi1MXIySEhYCLx+VMrexcj F4eQwFJGiTXH57JBJGQkTk5rYIWwhSX+XOtigyj6xChx8MxXsCI2AUOJrrcQCRGBTkaJad0f wUYxC0xmlni2+joTSJWwQIDE7devwGwWAVWJiRPfMILYvAJ2Ehv7rrFArJCXWL3hADOIzQkU P328FWy1kICtxPMPbWwTGPkWMDKsYhRJLS3OTc8tNtIrTswtLs1L10vOz93ECIykbcd+btnB 2PUu+BCjAAejEg/vi5DXcUKsiWXFlbmHGCU4mJVEeJ3Ono4T4k1JrKxKLcqPLyrNSS0+xGgK dNREZinR5HxglOeVxBuaGppbWBqaG5sbm1koifN2CByMERJITyxJzU5NLUgtgulj4uCUamCc KDxra4rLva77UmUNcVsEP6gwWTbl3PuU9mLf850yE7/2PTy6SMr/RfvpQ9o2h//t+umRdDja XCx4qk1fyAKFG0sOn8qZdTDnv9D1mLNPPySp+Gxdb7n4XNKXU1eW8Rznen3ih1f3Mq6sXWas LVNvzeJ3t/7AYFOgG77jUS+rokTIh6PdkRdWKrEUZyQaajEXFScCAHXemBa6AgAA X-CMS-MailID: 20200618154030eucas1p2f36e6ec52cea051fccedb1970f27bef9 X-Msg-Generator: CA X-RootMTR: 20200618154030eucas1p2f36e6ec52cea051fccedb1970f27bef9 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200618154030eucas1p2f36e6ec52cea051fccedb1970f27bef9 References: <20200618153956.29558-1-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: Juergen Gross , Bartlomiej Zolnierkiewicz , David Airlie , xen-devel@lists.xenproject.org, Boris Ostrovsky , 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 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 Acked-by: Juergen Gross --- drivers/xen/gntdev-dmabuf.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c index 75d3bb948bf3..ba6cad871568 100644 --- a/drivers/xen/gntdev-dmabuf.c +++ b/drivers/xen/gntdev-dmabuf.c @@ -247,10 +247,9 @@ static void dmabuf_exp_ops_detach(struct dma_buf *dma_buf, if (sgt) { if (gntdev_dmabuf_attach->dir != DMA_NONE) - dma_unmap_sg_attrs(attach->dev, sgt->sgl, - sgt->nents, - gntdev_dmabuf_attach->dir, - DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable(attach->dev, sgt, + gntdev_dmabuf_attach->dir, + DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sgt); } @@ -288,8 +287,8 @@ dmabuf_exp_ops_map_dma_buf(struct dma_buf_attachment *attach, sgt = dmabuf_pages_to_sgt(gntdev_dmabuf->pages, gntdev_dmabuf->nr_pages); if (!IS_ERR(sgt)) { - if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC)) { + if (dma_map_sgtable(attach->dev, sgt, dir, + DMA_ATTR_SKIP_CPU_SYNC)) { sg_free_table(sgt); kfree(sgt); sgt = ERR_PTR(-ENOMEM); @@ -625,7 +624,7 @@ dmabuf_imp_to_refs(struct gntdev_dmabuf_priv *priv, struct device *dev, /* Now convert sgt to array of pages and check for page validity. */ i = 0; - for_each_sg_page(sgt->sgl, &sg_iter, sgt->nents, 0) { + for_each_sgtable_page(sgt, &sg_iter, 0) { struct page *page = sg_page_iter_page(&sg_iter); /* * Check if page is valid: this can happen if we are given