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Wed, 28 Apr 2021 01:42:13 -0700 (PDT) Date: Wed, 28 Apr 2021 10:42:11 +0200 From: Corentin Labbe To: hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, iommu@lists.linux-foundation.org Subject: DMA mapping fill dma_address to 0 Message-ID: MIME-Version: 1.0 Content-Disposition: inline Cc: linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hello I work on the crypto offloader driver of cortina/gemini SL3516 SoC. I test it by filling a LUKS2 partition. I got a reproductible problem when handling skcipher requests. I use dma_map_sg() and when iterating other the result, sg_dma_address(sg) return 0. But sg_dma_len(sg) is still correct (4096 in my case). Below is a simplified view of my code: nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE); (nr_sgs = 1 in my case) sg = areq->src; if (!sg_dma_address(sg)) FAIL I have digged to find what do dma_map_sg() and I have added some debug. sg_page(sg) return c7efb000 for example so sg_page() works. But it seems the problem is that page_to_phys(sg_page(sg)) return 0. This problem does not appear immediatly, luksOpen and subsequent fsck always work. But it appears fast after, when mouting or rsync files in it. I have added CONFIG_DEBUG_SG, CONFIG_DMA_API_DEBUG, CONFIG_DMA_API_DEBUG_SG but they didnt bringed any more hints. Only "DMA-API: cacheline tracking ENOMEM, dma-debug disabled" appears but always with some "time" between my problem and its display. So I am not sure it is related. Regards _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu