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Mon, 4 May 2020 12:54:09 +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 v2 01/21] drm: core: fix sg_table nents vs. orig_nents misuse Date: Mon, 4 May 2020 14:53:39 +0200 Message-Id: <20200504125359.5678-1-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200504125017.5494-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSa0gUURTm7szOjptr02p51NDYSNDIRxpNapJhMBBR0B+ztKYcVstV2VHT CLJ8UNsa5gaJlS0pvtM0MzPKfG4lii9SKVNzEx+Jlq6mlOU6Wv++8z3udzhcEpPnie3JiKhY Th3FRioIKV7dsti+S009CfWYattBp7e/E9EVWeVi+k/1bYzuMU0TdFFJs4jW1/nScz3DIrpy 5IOY7q69T9CPmwYkdP2MUXxgA1OaU4qYV/N6nHk+PyRmBm8aRMzTvCvMx+URjNH1FSDmZX8S wdyqKkbMbKXjMWmw1C+Mi4yI59Tu/mek4ekDQTFpjgmlmf3iJKSx0yALEihveJ/fTGiQlJRT hQhKTDOEWZBTcwjK2oIFYRbB5EMjtp4wNqaIBKEAQX2LDhOGlcTvpk6x2UVQnqCZ0qw+ZUOl InibbmnGGJUlgubJOA0iSWvqKNTO8mYap3bA2PcvEjOWUX6QttCIhDInKHnyBjPbLaj9UHfj uLkKqDIJ3HthJARPICTnTuICtoYJQ5VEwFuhVafFhUAyguH2xxJh0CLovpa11uALn9qXCHMD RrlAea27QAfA2MOxVRooK+ib2iSsbwWZ1XcxgZbB9TS54HaGbEPZv9r6jq61WzHQmD+OC+fJ QJAyWoxnIKfs/2V6hIqRLRfHq5Qc7xnFXXTjWRUfF6V0OxetqkQrf6d12fCjBpm6zjYgikQK S1nQbHmoXMzG84mqBgQkprCR1aSsULIwNvESp44+rY6L5PgG5EDiCluZ16PxEDmlZGO5CxwX w6nXVRFpYZ+EfJ4Zi4YOusQHjp6S9C0mzG2z3+l43uHwA9e9zoO6y1q7MI/aLSGOhpzx6V+F vZVBXspCNnZgaeDrnlRXntX6qPadCNb7n8zVvD6EPLVFrlcH9fLhz8sQg/wnvTsWqifuxOhC g/CKzUexHO323Z0h0aamky0LAVNHvo1s/Dlm26vA+XDW0xVT8+xfU1n6hTcDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupgkeLIzCtJLcpLzFFi42I5/e/4Pd1CgQ1xBjf3m1r0njvJZLFxxnpW i//bJjJbXPn6ns1i5eqjTBYL9ltbfLnykMli0+NrrBaXd81hs1h75C67xcEPT1gduD3WzFvD 6LH32wIWj+3fHrB63O8+zuSxeUm9x+1/j5k9Jt9Yzuix+2YDm0ffllWMHp83yQVwRenZFOWX lqQqZOQXl9gqRRtaGOkZWlroGZlY6hkam8daGZkq6dvZpKTmZJalFunbJehl9N6NKGiTq1gz 6SZrA2OXZBcjJ4eEgInEk8MtTF2MXBxCAksZJT4+2cQMkZCRODmtgRXCFpb4c62LDaLoE6PE qmU/wBJsAoYSXW8hEiICnYwS07o/soM4zALzmCQWPTzEDlIlLOAr8WrRdUYQm0VAVeLFx0dg cV4BG4m274cZIVbIS6zecABoNQcHp4CtxP7OYJCwEFDJxwVLmCcw8i1gZFjFKJJaWpybnlts pFecmFtcmpeul5yfu4kRGAvbjv3csoOx613wIUYBDkYlHt4NX9fHCbEmlhVX5h5ilOBgVhLh 3dECFOJNSaysSi3Kjy8qzUktPsRoCnTTRGYp0eR8YJzmlcQbmhqaW1gamhubG5tZKInzdggc jBESSE8sSc1OTS1ILYLpY+LglGpg7O89c0vEvPfWl+2eq9rTj93kLJY6KDJ7VxTHsafvmItD XjRUZ7LzOn/ZMVfq+vmS+PbCW4dW3/y8zue36O5o/yVFfipur976z2E4YD23yXmChukjTrNr amKv20XmqupfZqvhfZO18nHa8pWBilZPHEwar+0T+lqZFVAQtD9uwT8h6VyF96zlSizFGYmG WsxFxYkAEpMMU5sCAAA= X-CMS-MailID: 20200504125409eucas1p2225bf61e6a293eb4da81ec26341488f3 X-Msg-Generator: CA X-RootMTR: 20200504125409eucas1p2225bf61e6a293eb4da81ec26341488f3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200504125409eucas1p2225bf61e6a293eb4da81ec26341488f3 References: <20200504125017.5494-1-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 , 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 dma_map_sg returns the numer of the created entries in the DMA address space. However the subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be called with the original number of entries passed to dma_map_sg. The sg_table->nents in turn holds the result of the dma_map_sg call as stated in include/linux/scatterlist.h. Adapt the code to obey those rules. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/drm_cache.c | 2 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 7 ++++--- drivers/gpu/drm/drm_prime.c | 9 +++++---- 3 files changed, 10 insertions(+), 8 deletions(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 03e01b0..63bd497 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -127,7 +127,7 @@ static void drm_cache_flush_clflush(struct page *pages[], 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_sg_page(st->sgl, &sg_iter, st->orig_nents, 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 df31e57..f47caa7 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -118,7 +118,7 @@ void drm_gem_shmem_free_object(struct drm_gem_object *obj) } else { if (shmem->sgt) { dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, - shmem->sgt->nents, DMA_BIDIRECTIONAL); + shmem->sgt->orig_nents, DMA_BIDIRECTIONAL); sg_free_table(shmem->sgt); kfree(shmem->sgt); } @@ -396,7 +396,7 @@ 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); + shmem->sgt->orig_nents, DMA_BIDIRECTIONAL); sg_free_table(shmem->sgt); kfree(shmem->sgt); shmem->sgt = NULL; @@ -623,7 +623,8 @@ 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); + sgt->nents = dma_map_sg(obj->dev->dev, sgt->sgl, sgt->orig_nents, + DMA_BIDIRECTIONAL); shmem->sgt = sgt; diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 282774e..f3e2d2a 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -626,8 +626,9 @@ 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)) { + sgt->nents = dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->orig_nents, + dir, DMA_ATTR_SKIP_CPU_SYNC); + if (!sgt->nents) { sg_free_table(sgt); kfree(sgt); sgt = ERR_PTR(-ENOMEM); @@ -652,7 +653,7 @@ 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_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->orig_nents, dir, DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sgt); kfree(sgt); @@ -975,7 +976,7 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, */ page_index = 0; dma_index = 0; - for_each_sg(sgt->sgl, sg, sgt->nents, count) { + for_each_sg(sgt->sgl, sg, sgt->orig_nents, count) { page_len = sg->length; page = sg_page(sg); dma_len = sg_dma_len(sg);