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Thu, 18 Jun 2020 15:40:24 +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 16/36] drm: panfrost: fix common struct sg_table related issues Date: Thu, 18 Jun 2020 17:39:37 +0200 Message-Id: <20200618153956.29558-17-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: H4sIAAAAAAAAA0VSW0hTcRjnv7OdHc3FaQr+UclYFJTmBQ0OzLSL4ekhktxDRZkrT1Oam+yo ZS95W+SaQ/NBkagRknnPaWtpmo7pjOkUFZu30rSLmmh5KxHX5pn29vt+3+/yPXwYwm/h+GDJ sjRKIRNLBag7W9/113psVjUfHzKQu4cosH5gEQ2l9RzCri9CiKHVRZSorO5kEdr3QmJlaIpF 6KaHOcRg8xOUqDVNcAn7OwOX6Fia4RCa2gH0JI+seVoDSMNEOSBb17RsUleVj5Jv1iY55OdH ZhbZWH6fHNuaRshiWwUgW0ayUFLTVAXIZd3+WI8r7hGJlDQ5g1IERya4J7VUjaKpPfDu118W bhbo9lIBNwzi4bCxZB1VAXeMj78E8K0+3zWsALhhUANmWAZw+mMfZ8eyvmx0LSoA7Kn/jexa WjVjiFOF4qFQtaBCndgLVwLYXeDhFCH4DAva/tRuR3niItinNjmiMIyNH4JDXUInzcMj4dLr RsC0+cPqV+3bmW4O3mJWcpw5ELdyYX/3kEsUDU0rzxAGe8I5cxOXwX7QUqxmM4ZcAKestVxm UAM4mFPqcgvhuHUDdV6B4EdgfXMwQ5+COYYFrpOG+F5oW9jnpBEHfKwvQRiaBx8+4DPqw7DM XLdb29E/4DqHhLP9ldtFfLwIwN4vAYXAv+x/lxaAKuBNpdMpEooOk1F3gmhxCp0ukwTdlKfo gOOlLFvmVQNo27xhBDgGBB68H6L5eD5HnEFnphgBxBCBF+90ryWez0sUZ96jFPLrinQpRRuB L8YWePPCns9e4+MScRp1m6JSKcXOloW5+WQBdWjHXER7Xbz0rLAmDrkYbs/zy95sD2gAZT3V InX0eZspzq5sm/wWg4px+WjjeHUyTg5OXVg0kBWhuhGt7ZbvkujATEtg3kYIECklXp6Jx2Xf +2xR61fP0YWLxVGXEjSBWPLImc6SEf/LcvBzOLb8xCe9tEsUk738wnYQE7DpJHHoUURBi/8B /a4TOk4DAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprDIsWRmVeSWpSXmKPExsVy+t/xu7ovul7HGSybYGrRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8eXKQyaLTY+vsVpc3jWHzWLtkbvsFv/37GC3OPjhCatF 39pLbA68HmvmrWH02HF3CaPH3m8LWDw2repk89j+7QGrx/3u40wem5fUe9z+95jZY/KN5Ywe u282sHn0bVnF6PF5k1wAT5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJpZ6hsXmslZGpkr6d TUpqTmZZapG+XYJexu5Vt9gKzkhUPP14mr2B8YRIFyMnh4SAicT3z4cYuxi5OIQEljJKrNq3 hhkiISNxcloDK4QtLPHnWhcbRNEnRome9nWMIAk2AUOJrrcQCRGBTkaJad0f2UESzAJvmCQu XY0AsYUFgiRO3LoGNJWDg0VAVeLKMWuQMK+AncSHrZsZIRbIS6zecABsMSdQ/PTxVrDFQgK2 Es8/tLFNYORbwMiwilEktbQ4Nz232EivODG3uDQvXS85P3cTIzBmth37uWUHY9e74EOMAhyM Sjy8L0JexwmxJpYVV+YeYpTgYFYS4XU6ezpOiDclsbIqtSg/vqg0J7X4EKMp0E0TmaVEk/OB 8ZxXEm9oamhuYWlobmxubGahJM7bIXAwRkggPbEkNTs1tSC1CKaPiYNTqoHx0LzAfpscs/Dv d5Yk35PmammMXHfFN01OYXrC/uvPJWInTZe+U7+zIVMpa/rZ1Qdu9p7+Fux5mXetU6XfhK6f 1/6pxZw+VCvh/ivXZ7duXeT9b48D9maLmzcHnv/o8DQzazl/xDPfZ4IMTGn7FYMy3BykQxgL o5N1LFTXeT66xj+tZ47m3PlKLMUZiYZazEXFiQAFAmGNrwIAAA== X-CMS-MailID: 20200618154024eucas1p2e093781df622f8326297518f4eacd2fe X-Msg-Generator: CA X-RootMTR: 20200618154024eucas1p2e093781df622f8326297518f4eacd2fe X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200618154024eucas1p2e093781df622f8326297518f4eacd2fe 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: Tomeu Vizoso , Bartlomiej Zolnierkiewicz , David Airlie , 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 Reviewed-by: Steven Price Reviewed-by: Rob Herring --- drivers/gpu/drm/panfrost/panfrost_gem.c | 4 ++-- drivers/gpu/drm/panfrost/panfrost_mmu.c | 7 +++---- 2 files changed, 5 insertions(+), 6 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/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index ac5d0aa80276..ba8450ea04d0 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -41,8 +41,8 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj) for (i = 0; i < n_sgt; i++) { if (bo->sgts[i].sgl) { - dma_unmap_sg(pfdev->dev, bo->sgts[i].sgl, - bo->sgts[i].nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(pfdev->dev, &bo->sgts[i], + DMA_BIDIRECTIONAL, 0); sg_free_table(&bo->sgts[i]); } } diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index 0a339c6fbfaa..fd294f6a7d3b 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -253,7 +253,7 @@ static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, struct io_pgtable_ops *ops = mmu->pgtbl_ops; u64 start_iova = iova; - for_each_sg(sgt->sgl, sgl, sgt->nents, count) { + for_each_sgtable_dma_sg(sgt, sgl, count) { unsigned long paddr = sg_dma_address(sgl); size_t len = sg_dma_len(sgl); @@ -517,10 +517,9 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, if (ret) goto err_pages; - if (!dma_map_sg(pfdev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL)) { - ret = -EINVAL; + ret = dma_map_sgtable(pfdev->dev, sgt, DMA_BIDIRECTIONAL, 0); + if (ret) goto err_map; - } mmu_map_sg(pfdev, bomapping->mmu, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);