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Fri, 19 Jun 2020 10:37:05 +0000 (GMT) X-AuditID: cbfec7f5-38bff700000018ae-6b-5eec95529c22 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id BD.0B.06017.1559CEE5; Fri, 19 Jun 2020 11:37:05 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200619103705eusmtip2c4079c382c05ce6c31ccdc0672deae4a~Z66I8g9jD0229502295eusmtip2i; Fri, 19 Jun 2020 10:37:05 +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 v7 19/36] drm: rockchip: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:19 +0200 Message-Id: <20200619103636.11974-20-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: H4sIAAAAAAAAA0WSfSzUcRzH973fw/3I3X4dzSeF7Yb1sJSutt/GlKj9tGk96J826ie/ZB53 l0qtpRTSCWdiFqlV5LHU0BNR8lQ3nB5U1jnN4iQLV6xcd37ov9fn/Xl/Pu/v97svhckaCCcq MvYYr4zlouWkLV77alq7bm/uaOiGt59pJkPbLmLu51cTjLk2G2N6p36QzN3yFhFjNhgJplBz hilu9GYmewdETM3gO4LRPb5GMj/1ZoypfNkvZprGvxJbpWxFUQVin5mKcbbOpCfYL5dbReyD W2fZT7ODGJvzoQSxT/qSSPZvQSPOXnlYhti6d0UYO1HjstvugK1POB8deZxXrvc9ZHu0pVFD xGc6n0w2zBBJKAfSkQ0F9CYo6uvE05EtJaNLEfy+rieFYhKBpuocYXXJ6AkEWk3YwkT/o3Kx oJcg6B7hFgeSL+lIa4OkvSD9e/ocO9AXEbRl2FkZo69iUDa1w8r2dDDcNJrmPDjtDlVt+rml EtoXUuv7SSHMFcrvPcesbGPRjReaCGsY0D1ieNqeMm8KgJLaR0hgexhpfSgWeCV05qhxYSAZ wYC2UiwUagS68/nzE97wWTtj2URZjrcaqh+vF2Q/UHf0iawy0FL48H2pcAEpaGrzMEGWQFqK THB7QEFr1WJsU1cPJjALw3VdSHigbARqw0eUhVwL/ocVI1SGHPkEVUwEr1LE8ic8VVyMKiE2 wvNwXEwNsvyqztnWqXrU8CesGdEUkttJvgUbQ2UEd1yVGNOMgMLkDpJtbzpDZZJwLvEUr4w7 qEyI5lXNaAWFyx0lipvDITI6gjvGR/F8PK9c6IooG6ckVLpxn2H7UFB1d5rHlpyxI2SmVtHU +17MFPa379w8zoXqKh3r/X3cb+cFrqskJ1u8eoaGlwR3uHnfCNozvL/az3k6bDnPunmmhPkH ZtXdkb1ePj0D/ssMoxVrTavqB4buGfUZpYaxhhppWYDZPupg7q0XqehXiK7ZZRelOO2S9UyO q45yXmswpYr7BwQnTRZRAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t/xe7qBU9/EGSw+aGnRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMln8f/Sa1WLupFqLBfutLb5cechksenxNVaLy7vmsFl8evCf2WLt kbvsFgc/PGF14PNYM28No8febwtYPLZ/e8Dqcb/7OJPH5iX1Hrf/PWb2mHxjOaPH7psNbB5/ Z+1n8ejbsorRY/u1ecwenzfJBfBE6dkU5ZeWpCpk5BeX2CpFG1oY6RlaWugZmVjqGRqbx1oZ mSrp29mkpOZklqUW6dsl6GUc3T+JtaBftqL50S/WBsbJEl2MnBwSAiYSd3euZu9i5OIQEljK KPH6/lF2iISMxMlpDawQtrDEn2tdbBBFnxglHj6dyAKSYBMwlOh6C5EQEehklJjW/RFsFLPA PGaJ5asOM4FUCQsESWzcPg1sFIuAqsS6Ew/AVvAK2Em077jLBrFCXmL1hgPMIDYnUPx1y0Gw eiEBW4nlC94zT2DkW8DIsIpRJLW0ODc9t9hIrzgxt7g0L10vOT93EyMwfrYd+7llB2PXu+BD jAIcjEo8vC9CXscJsSaWFVfmHmKU4GBWEuF1Ons6Tog3JbGyKrUoP76oNCe1+BCjKdBRE5ml RJPzgbGdVxJvaGpobmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qBkVvPz2Vd jjbb5z6Jh+wxCgr1uqGFr+4y6t5cHhwT1JmVJKx1cL19kfLNyRPVHlTMfHM0IrWP6UJYkFqM XgW7eNyRhoUr5zTcduQV1d/FOeXiBKXX/7/qz924WTTx3J2QbemHPHZx7J6g1pL2fzrz8hKD zAU7nY+eE52SHHlUMWJm3Pmo876/lFiKMxINtZiLihMBVz1aMbUCAAA= X-CMS-MailID: 20200619103706eucas1p24f226bc00559f0812bc44d7933acd1e4 X-Msg-Generator: CA X-RootMTR: 20200619103706eucas1p24f226bc00559f0812bc44d7933acd1e4 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103706eucas1p24f226bc00559f0812bc44d7933acd1e4 References: <20200619103636.11974-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200619_033708_281333_8FE7C4A1 X-CRM114-Status: GOOD ( 15.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Heiko=20St=C3=BCbner?= , Bartlomiej Zolnierkiewicz , David Airlie , Sandy Huang , linux-rockchip@lists.infradead.org, Daniel Vetter , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 23 +++++++++------------ 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index 2970e534e2bb..cb50f2ba2e46 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -36,8 +36,8 @@ static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj) rk_obj->dma_addr = rk_obj->mm.start; - ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl, - rk_obj->sgt->nents, prot); + ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt, + prot); if (ret < rk_obj->base.size) { DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n", ret, rk_obj->base.size); @@ -98,11 +98,10 @@ static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj) * TODO: Replace this by drm_clflush_sg() once it can be implemented * without relying on symbols that are not exported. */ - for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i) + for_each_sgtable_sg(rk_obj->sgt, s, i) sg_dma_address(s) = sg_phys(s); - dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents, - DMA_TO_DEVICE); + dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE); return 0; @@ -350,8 +349,8 @@ void rockchip_gem_free_object(struct drm_gem_object *obj) if (private->domain) { rockchip_gem_iommu_unmap(rk_obj); } else { - dma_unmap_sg(drm->dev, rk_obj->sgt->sgl, - rk_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(drm->dev, rk_obj->sgt, + DMA_BIDIRECTIONAL, 0); } drm_prime_gem_destroy(obj, rk_obj->sgt); } else { @@ -476,15 +475,13 @@ rockchip_gem_dma_map_sg(struct drm_device *drm, struct sg_table *sg, struct rockchip_gem_object *rk_obj) { - int count = dma_map_sg(drm->dev, sg->sgl, sg->nents, - DMA_BIDIRECTIONAL); - if (!count) - return -EINVAL; + int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0); + if (err) + return err; if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) { DRM_ERROR("failed to map sg_table to contiguous linear address.\n"); - dma_unmap_sg(drm->dev, sg->sgl, sg->nents, - DMA_BIDIRECTIONAL); + dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0); return -EINVAL; } -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel