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Thu, 18 Jun 2020 15:40:19 +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 09/36] drm: i915: fix common struct sg_table related issues Date: Thu, 18 Jun 2020 17:39:30 +0200 Message-Id: <20200618153956.29558-10-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: H4sIAAAAAAAAA0VSa0hTYRjmPefs7Dhcnabg19UYXUgw0yK+KKKL0Yn6oWR/Is1ZJ5V06uay BZErLFspU0PFUpcF1szmdZoW2rwsM7VyDUUl04JMwsoVXbTlPGr/nvd5nvd7Hl4+hpS1iJYx scpkXqVUxMlpCWVp/9Xj/14/HrHpcu1KnNHdQeDKfLMIuyxZJLZ/n6Dx/bI2At80VBPY2LQd l/aaAT+5TWCn/R2Bq0YdItzbcIvG5a1DYvz0y3sRbipwiHct5h4UPQDuyQ8jxd15PEZwdT+G RVxRRyj39pqN4KrvXuAG/o6SXE5fKXCN/ak0l1ljAm6yalWI51HJjpN8XOwZXhWwM1ISU2Yq pBKNK84W29ekgs1HDx4MYregvl92sR4kjIy9B6jKYKSFwQmo/s/EnDIJ6M03Mzm/Yh3LBUEo BdR8JR0WVkxDA2K3i2YDkf6znnZjbzYN0LMMT7eJZFtJ9NroALfgxYagytoaQg8MQ7Fr0c8b W920lN2JXgzXz6X5orKK5lnsMcN32tJE7ncQ6xCjN66vlGAKRqWtFXPYC32y1YgFvAK5HhUT wsIlQO+6y8XCcB1Q78V8EFzb0WD3b9rdgmQ3IHNDgEDvRmMt07PlELsI9X1e4qbJGZhtySMF WorSL8sE9zpUYHu4EPv05eu5/hzKcTWRwoGyADV1NVIG8C34H2YEMIEPr1HHR/PqICWfslGt iFdrlNEbTyTEV8HM1+r8a3PWQ8NUlBVYBuSe0o9h4xEykeKMWhtvBcSQcm/pnq7OCJn0pEJ7 jlclHFdp4ni1FZYzlNxHurlkLFzGRiuS+dM8n8ir5lWC8ViWCsf6I6uDzLr2slw9Tty2dnV+ ybcjfUlXRwI1Lrw3Ji8l2BDlc37J86kPSc5rg6/kbYX3ZBpT8IH+ui6/CpFlUXNGaBq4LNZp 6rBjv1YSUKk7xLlYXbZRm+48mLH+RRgdnjRSsM+7bnPzqYGBcemrSFW4X7t/sq6wZ6k5sxgM ckodowj0I1VqxT8EuuQBVgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t/xu7pPul7HGUxawGbRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlnMnrCZyWLBfmuL5ZfXM1rsXchk8eXKQyaLTY+vsVpc3jWHzWLt kbvsFgc/PGG12D/rGrsDv8eaeWsYPfZ+W8DisXjPSyaP7d8esHrMOxnocb/7OJPH5iX1Hrf/ PWb2mHxjOaPH7psNbB59W1YxenzeJBfAE6VnU5RfWpKqkJFfXGKrFG1oYaRnaGmhZ2RiqWdo bB5rZWSqpG9nk5Kak1mWWqRvl6CXsXrVXJaCBTIV86+oNDAeF+9i5OSQEDCROPRyGiOILSSw lFFi5TIriLiMxMlpDawQtrDEn2tdbF2MXEA1nxglHrT2gyXYBAwlut5CJEQEOhklpnV/ZAdJ MAucYZb4vcEbxBYW8JN4NeM3UAMHB4uAqsSPKWYgYV4BO4kzD3YwQyyQl1i94QCYzQkUP328 lRXiIFuJ5x/a2CYw8i1gZFjFKJJaWpybnltsqFecmFtcmpeul5yfu4kRGD/bjv3cvIPx0sbg Q4wCHIxKPLwvQl7HCbEmlhVX5h5ilOBgVhLhdTp7Ok6INyWxsiq1KD++qDQntfgQoynQTROZ pUST84GxnVcSb2hqaG5haWhubG5sZqEkztshcDBGSCA9sSQ1OzW1ILUIpo+Jg1OqgTHw11z2 6PCT685wfP8oXrLCl1lff1aXxvWdl0xc36+IELx6uOVGKOOJHZWak1y4d/daMj4NebTK8aep 90Tu4CN8EW1qlVU7r1Xs61cTVVgi/Tnxxmm9E0wzIu6ufDHb52f8gbm6h5a7alh4Cr2c2KEQ EPS233VWD8ecg9P5d68/KbTMarFG010lluKMREMt5qLiRAAR+nxFtQIAAA== X-CMS-MailID: 20200618154020eucas1p2b1cc0b386396bd09b735cc9d06906082 X-Msg-Generator: CA X-RootMTR: 20200618154020eucas1p2b1cc0b386396bd09b735cc9d06906082 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200618154020eucas1p2b1cc0b386396bd09b735cc9d06906082 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: Bartlomiej Zolnierkiewicz , David Airlie , intel-gfx@lists.freedesktop.org, Rodrigo Vivi , 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. This driver creatively uses sg_table->orig_nents to store the size of the allocated scatterlist and ignores the number of the entries returned by dma_map_sg function. The sg_table->orig_nents is (mis)used to properly free the (over)allocated scatterlist. This patch only introduces the common DMA-mapping wrappers operating directly on the struct sg_table objects to the dmabuf related functions, so the other drivers, which might share buffers with i915 could rely on the properly set nents and orig_nents values. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 11 +++-------- drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c | 7 +++---- 2 files changed, 6 insertions(+), 12 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/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 2679380159fc..8a988592715b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -48,12 +48,9 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme src = sg_next(src); } - if (!dma_map_sg_attrs(attachment->dev, - st->sgl, st->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC)) { - ret = -ENOMEM; + ret = dma_map_sgtable(attachment->dev, st, dir, DMA_ATTR_SKIP_CPU_SYNC); + if (ret) goto err_free_sg; - } return st; @@ -73,9 +70,7 @@ static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, { struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); - dma_unmap_sg_attrs(attachment->dev, - sg->sgl, sg->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable(attachment->dev, sg, dir, DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sg); kfree(sg); diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c index debaf7b18ab5..be30b27e2926 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c @@ -28,10 +28,9 @@ static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment, sg = sg_next(sg); } - if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { - err = -ENOMEM; + err = dma_map_sgtable(attachment->dev, st, dir, 0); + if (err) goto err_st; - } return st; @@ -46,7 +45,7 @@ static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *st, enum dma_data_direction dir) { - dma_unmap_sg(attachment->dev, st->sgl, st->nents, dir); + dma_unmap_sgtable(attachment->dev, st, dir, 0); sg_free_table(st); kfree(st); }