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Fri, 4 Sep 2020 13:35:00 +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 , Rob Clark , Sean Paul , linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org Subject: [PATCH v10 12/30] drm: msm: fix common struct sg_table related issues Date: Fri, 4 Sep 2020 15:16:53 +0200 Message-Id: <20200904131711.12950-13-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200904131711.12950-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUwTURSGuZ0uQ0NlLBiuiJI0SqJRlsrDJCgqLplEFMQHg0ahygQItJAW EDBR0KCmgmEJ2gAKgoBssu8CUpBKkIoCsg77IhpiDRWFIth2UN/++//fueeek4si/DaWNRoo CSOlElGwgM1l1nSsvD8Q5+bl4/h1ZDueoO5k4OWKUha+UZOE4H0/vrHxjPlugBcUvWHgWS0u uLZvkoFXTH9i4Ukt3Ry8tyGDjZe0Uxx8/tkvBG/VzLBwKqUdHDUnip8WA6JpOYtJ1KdRHKJ2 eYJFjD9QMYjK57eIkfVphEgZzAdE41AMm1A1DHOIh1WFgFiq2OVpdpF7yI8MDowgpQ6uvtyA uWENCKUEkc2KGSQGrNnIgSkKMWf4RXWPLQdclI+9ALBsro5tCPiYFsDOeGc6WAKQymliyAFq rEgtsKaZfADfrp6nGT3fT00xDAEbc4LyRbnxIkssTg8lmBkgBEtD4GelzhhYYJ4wZ15jLGBi e2ByeZdR8zBXODb6nUk/zxYWlb1GDNpU71crZliGiyA2xoHpmvRN6AR89aEWobWFfp4qDq1t 4EZ9JoMuuAPgpLqEQx/iAey9rQA05QJH1atsw2wItheWNjjQ9jE4UJjHokfeAgcXtxpsRC+T ax4jtM2D9+/yadoOpqle/mvb2vNxEyFg/sQZekFJ+j0Ml3MSgW3a/15ZABQCKzJcJvYnZUIJ ed1eJhLLwiX+9tdCxBVA/7W61lXaOtCwdlUJMBQIzHgmR7x8+CxRhCxKrAQQRQSWPLfurit8 np8oKpqUhvhIw4NJmRLsQJkCK97B7IXLfMxfFEYGkWQoKf2bMlBT6xjgGLvTPC+0OcVsQCfs eXeh09k16FxiP2/hrDA5EuROw9nDyGJjBDOxd4nyqtLZKQU6b+9V99FTYBbkru8OGso8bbLf sm1Yx/XomJKkxt5UaG9QZJwW83V31ERfGhfyVx6lHK+uXHriN1jg/TsIocQeOW4/MbXw5Ei2 pC1zm4ApCxA57UOkMtEfgA/Lx1YDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrGIsWRmVeSWpSXmKPExsVy+t/xu7qtTkHxBhtFLHrPnWSy2DhjPavF /20TmS2ufH3PZjHn+VlGi5WrjzJZLNhvbfHlykMmi02Pr7FaTNx/lt3i8q45bBZrj9xlt3i+ 8AezxcEPT1gt7k4+wujA77Fm3hpGj73fFrB47Jx1l91j+7cHrB73u48zeWxeUu9x+99jZo/J N5Yzeuy+2cDmcXzXLXaPvi2rGD0+b5IL4InSsynKLy1JVcjILy6xVYo2tDDSM7S00DMysdQz NDaPtTIyVdK3s0lJzcksSy3St0vQy3h26wNjwV2lin0znjA3MP6R6WLk4JAQMJGYulKqi5GL Q0hgKaPEgrs/2bsYOYHiMhInpzWwQtjCEn+udbFBFH1ilNj/4xFYEZuAoUTXW4iEiEAno8S0 7o/sIA6zwBJmib6pl9hAqoQF/CQ+HzoBNopFQFVi0sbTTCA2r4CdxL07H1kgVshLrN5wgBnE 5gSKb53xBKxeSMBW4sOcxSwTGPkWMDKsYhRJLS3OTc8tNtQrTswtLs1L10vOz93ECIyjbcd+ bt7BeGlj8CFGAQ5GJR5eBvugeCHWxLLiytxDjBIczEoivE5nT8cJ8aYkVlalFuXHF5XmpBYf YjQFOmois5Rocj4wxvNK4g1NDc0tLA3Njc2NzSyUxHk7BA7GCAmkJ5akZqemFqQWwfQxcXBK NTDaPevftdRdViYiOkde6ppRfqLLrF4Bu1/n1D06U69u599whKe18IvqhjilvFNVnMd4t7xd 7MQqbXm/K7DrB4Pk7X2nRe8s8L+z07Fz/tzED99veK0UcNgsfj01XeykJk/f1O2mcbUWl2NW yT05uKD/SkDYAplPYX8MHr2cdcin8TtfWfek/H4lluKMREMt5qLiRAAN31+euQIAAA== X-CMS-MailID: 20200904133501eucas1p2a2bc13658bf8433a10fcb8d5a173d57a X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200904133501eucas1p2a2bc13658bf8433a10fcb8d5a173d57a X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200904133501eucas1p2a2bc13658bf8433a10fcb8d5a173d57a References: <20200904131711.12950-1-m.szyprowski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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. Signed-off-by: Marek Szyprowski Acked-by: Rob Clark --- drivers/gpu/drm/msm/msm_gem.c | 13 +++++-------- drivers/gpu/drm/msm/msm_gpummu.c | 15 +++++++-------- drivers/gpu/drm/msm/msm_iommu.c | 2 +- 3 files changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index b2f49152b4d4..8c7ae812b813 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -53,11 +53,10 @@ static void sync_for_device(struct msm_gem_object *msm_obj) struct device *dev = msm_obj->base.dev->dev; if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) { - dma_sync_sg_for_device(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_sync_sgtable_for_device(dev, msm_obj->sgt, + DMA_BIDIRECTIONAL); } else { - dma_map_sg(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_map_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0); } } @@ -66,11 +65,9 @@ static void sync_for_cpu(struct msm_gem_object *msm_obj) struct device *dev = msm_obj->base.dev->dev; if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) { - dma_sync_sg_for_cpu(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_sync_sgtable_for_cpu(dev, msm_obj->sgt, DMA_BIDIRECTIONAL); } else { - dma_unmap_sg(dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0); } } diff --git a/drivers/gpu/drm/msm/msm_gpummu.c b/drivers/gpu/drm/msm/msm_gpummu.c index 310a31b05faa..53a7348476a1 100644 --- a/drivers/gpu/drm/msm/msm_gpummu.c +++ b/drivers/gpu/drm/msm/msm_gpummu.c @@ -30,21 +30,20 @@ static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova, { struct msm_gpummu *gpummu = to_msm_gpummu(mmu); unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE; - struct scatterlist *sg; + struct sg_dma_page_iter dma_iter; unsigned prot_bits = 0; - unsigned i, j; if (prot & IOMMU_WRITE) prot_bits |= 1; if (prot & IOMMU_READ) prot_bits |= 2; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - dma_addr_t addr = sg->dma_address; - for (j = 0; j < sg->length / GPUMMU_PAGE_SIZE; j++, idx++) { - gpummu->table[idx] = addr | prot_bits; - addr += GPUMMU_PAGE_SIZE; - } + for_each_sgtable_dma_page(sgt, &dma_iter, 0) { + dma_addr_t addr = sg_page_iter_dma_address(&dma_iter); + int i; + + for (i = 0; i < PAGE_SIZE; i += GPUMMU_PAGE_SIZE) + gpummu->table[idx++] = (addr + i) | prot_bits; } /* we can improve by deferring flush for multiple map() */ diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c index 3a381a9674c9..6c31e65834c6 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -36,7 +36,7 @@ static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova, struct msm_iommu *iommu = to_msm_iommu(mmu); size_t ret; - ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot); + ret = iommu_map_sgtable(iommu->domain, iova, sgt, prot); WARN_ON(!ret); return (ret == len) ? 0 : -EINVAL; -- 2.17.1