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Fri, 19 Jun 2020 10:36:54 +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 03/36] drm: core: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:03 +0200 Message-Id: <20200619103636.11974-4-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: H4sIAAAAAAAAA+NgFjrMKsWRmVeSWpSXmKPExsWy7djPc7ruU9/EGXQeVLLoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+HLlIZPFpsfXWC0u75rDZrH2yF12i4Uft7JYtHUuY7U4 +OEJq8WWNxNZHfg81sxbw+ix99sCFo9NqzrZPLZ/e8DqMe9koMf97uNMHpuX1Hvc/veY2WPy jeWMHrtvNrB59G1Zxeix+XS1x+dNcgG8UVw2Kak5mWWpRfp2CVwZT04nFOxVrdh++xprA+NU +S5GTg4JAROJv5Pes3UxcnEICaxglFh5aQYThPOFUeJF41NmCOczo8Tie5NYYVr2NP9gh0gs Z5TYPOMcK1zLhReb2ECq2AQMJbredoHZIgKtjBInenlAipgFFjBL/PzcxgiSEBYIkHg6dyM7 iM0ioCpx+fIuFhCbV8BWYuOyRSwQ6+QlVm84wAxicwrYSbxuOQi2TULgGrvE1v7fTBBFLhJv m2YwQtjCEq+Ob2GHsGUkTk/uYYFoaGaUeHhuLTuE08MocRmuw1rizrlfQLdyAN2nKbF+lz6I KSHgKLF8qTqEySdx460gSDEzkDlp23RmiDCvREebEMQMNYlZx9fBbT144RIzhO0hcef2I2iY TmSUeP7vI8sERvlZCLsWMDKuYhRPLS3OTU8tNsxLLdcrTswtLs1L10vOz93ECExap/8d/7SD 8eulpEOMAhyMSjy8DuGv44RYE8uKK3MPMUpwMCuJ8DqdPR0nxJuSWFmVWpQfX1Sak1p8iFGa g0VJnNd40ctYIYH0xJLU7NTUgtQimCwTB6dUA+O0WOEPVm+sa3m/54l+X/W1KOkRw8L4CSeT uKqcXXenHXCfWZz8qvzVYva2y4XvlfLdFvikKf98qLralqnSV7q782jF57Tvx/kWn1d7NyH4 Ueoz3j3Tz5rNnVOWyJWs3Ln5Qeld9/b/Wi7i2uIyJ7Y69bbnVRT0cQkKT33q8ePkvmvi96vn b1ZiKc5INNRiLipOBAD7GP0RVgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCIsWRmVeSWpSXmKPExsVy+t/xe7ruU9/EGczIsOg9d5LJYuOM9awW /7dNZLa48vU9m8XK1UeZLBbst7b4cuUhk8Wmx9dYLS7vmsNmsfbIXXaLhR+3sli0dS5jtTj4 4QmrxZY3E1kd+DzWzFvD6LH32wIWj02rOtk8tn97wOox72Sgx/3u40wem5fUe9z+95jZY/KN 5Yweu282sHn0bVnF6LH5dLXH501yAbxRejZF+aUlqQoZ+cUltkrRhhZGeoaWFnpGJpZ6hsbm sVZGpkr6djYpqTmZZalF+nYJehlPTicU7FWt2H77GmsD41T5LkZODgkBE4k9zT/Yuxi5OIQE ljJKnJxylB0iISNxcloDK4QtLPHnWhcbRNEnRonXD1eBFbEJGEp0vYVIiAh0MkpM6/4INopZ YAWzxKt9c1lAqoQF/CRWXv8D1sEioCpx+fIusDivgK3ExmWLWCBWyEus3nCAGcTmFLCTeN1y EGy1EFDN8gXvmScw8i1gZFjFKJJaWpybnltspFecmFtcmpeul5yfu4kRGEPbjv3csoOx613w IUYBDkYlHt4XIa/jhFgTy4orcw8xSnAwK4nwOp09HSfEm5JYWZValB9fVJqTWnyI0RToqInM UqLJ+cD4ziuJNzQ1NLewNDQ3Njc2s1AS5+0QOBgjJJCeWJKanZpakFoE08fEwSnVwMi1elm/ +GWrix98hL7v4L9sFb+E7drxlcuZTp428Clc/jE8SuxC/sWII1ft9ZOUZC8v2ma5hL/Hrejs s5h/rjprb4jPMPRerOjyqZ3DR3ChwDnuqy/miE5Ivsa2+XTHVdWnm6wXnJkw//gEHrmc3NOC ZwTssiZ7KLjfCVi1dKLAnK3nFvscac9TYinOSDTUYi4qTgQAPFPccrcCAAA= X-CMS-MailID: 20200619103655eucas1p1b01cbe67526e2b2f8254eb20ccac1858 X-Msg-Generator: CA X-RootMTR: 20200619103655eucas1p1b01cbe67526e2b2f8254eb20ccac1858 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103655eucas1p1b01cbe67526e2b2f8254eb20ccac1858 References: <20200619103636.11974-1-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: Thomas Zimmermann , 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 --- drivers/gpu/drm/drm_cache.c | 2 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 14 +++++++++----- drivers/gpu/drm/drm_prime.c | 11 ++++++----- 3 files changed, 16 insertions(+), 11 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel Reviewed-by: Andrzej Hajda diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 03e01b000f7a..0fe3c496002a 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -127,7 +127,7 @@ drm_clflush_sg(struct sg_table *st) struct sg_page_iter sg_iter; mb(); /*CLFLUSH is ordered only by using memory barriers*/ - for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) + for_each_sgtable_page(st, &sg_iter, 0) drm_clflush_page(sg_page_iter_page(&sg_iter)); mb(); /*Make sure that all cache line entry is flushed*/ diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 4b7cfbac4daa..47d8211221f2 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -126,8 +126,8 @@ void drm_gem_shmem_free_object(struct drm_gem_object *obj) drm_prime_gem_destroy(obj, shmem->sgt); } else { if (shmem->sgt) { - dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, - shmem->sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(obj->dev->dev, shmem->sgt, + DMA_BIDIRECTIONAL, 0); sg_free_table(shmem->sgt); kfree(shmem->sgt); } @@ -424,8 +424,7 @@ void drm_gem_shmem_purge_locked(struct drm_gem_object *obj) WARN_ON(!drm_gem_shmem_is_purgeable(shmem)); - dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, - shmem->sgt->nents, DMA_BIDIRECTIONAL); + dma_unmap_sgtable(obj->dev->dev, shmem->sgt, DMA_BIDIRECTIONAL, 0); sg_free_table(shmem->sgt); kfree(shmem->sgt); shmem->sgt = NULL; @@ -697,12 +696,17 @@ struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj) goto err_put_pages; } /* Map the pages for use by the h/w. */ - dma_map_sg(obj->dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); + ret = dma_map_sgtable(obj->dev->dev, sgt, DMA_BIDIRECTIONAL, 0); + if (ret) + goto err_free_sgt; shmem->sgt = sgt; return sgt; +err_free_sgt: + sg_free_table(sgt); + kfree(sgt); err_put_pages: drm_gem_shmem_put_pages(shmem); return ERR_PTR(ret); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index b717e52e909e..d583d6545666 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -617,6 +617,7 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, { struct drm_gem_object *obj = attach->dmabuf->priv; struct sg_table *sgt; + int ret; if (WARN_ON(dir == DMA_NONE)) return ERR_PTR(-EINVAL); @@ -626,11 +627,12 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, else sgt = obj->dev->driver->gem_prime_get_sg_table(obj); - if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC)) { + ret = dma_map_sgtable(attach->dev, sgt, dir, + DMA_ATTR_SKIP_CPU_SYNC); + if (ret) { sg_free_table(sgt); kfree(sgt); - sgt = ERR_PTR(-ENOMEM); + sgt = ERR_PTR(ret); } return sgt; @@ -652,8 +654,7 @@ void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, if (!sgt) return; - dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir, - DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sgt); kfree(sgt); }