From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B0AAC43460 for ; Wed, 28 Apr 2021 08:42:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49A47608FC for ; Wed, 28 Apr 2021 08:42:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237741AbhD1InF (ORCPT ); Wed, 28 Apr 2021 04:43:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237685AbhD1InA (ORCPT ); Wed, 28 Apr 2021 04:43:00 -0400 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F68DC061574 for ; Wed, 28 Apr 2021 01:42:14 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id q9so7957435wrs.6 for ; Wed, 28 Apr 2021 01:42:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition; bh=R50Avg3KJsdo4BeRwGLPiE4UlIIB3LgXMqGrn5lll8k=; b=ETU7dwygJgj5eDXnQ6pfi8iUFUTNPKNdnHUTtW+jULXAx/Vdo49mFXvIn2v2R27hXv iVliB+NYWvwxC1riBHhTYfZGSQH5pFCt0sDbhBevXrXj1qMygABOrewfJeH3HJmKjITx kr6IWY90hpyzQJKzOWVN+mWmrAsdU6U2clfBH944wiv4iI26p71EPmfladdeU5xSOHAf w9bImLnUiI4uk8bn6id3EkJRvEXYNGNz/i6zUJTnLQSRn/To+XmsWNttfrmwksHbczAr Ka6AO646FVNH74yu8brS8CPnOwmEVudbsFVfHVQ6KjhBd+hnN3Y5IA5rJsrc78PzGdmw 13Yg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition; bh=R50Avg3KJsdo4BeRwGLPiE4UlIIB3LgXMqGrn5lll8k=; b=n7pITc9JiQSuLczpVRtQf6stcRz/piKZ8Mt3YXKiwL6RdpqA8kw94FFbS0N2sEM0RH qQLjQGArQ2tu5Pln+QeNuWKHaqUl+Gm6luAEs8CwchDsY8l2Qe4k4njJu9rIT3XQ9JrY C5VjRTk1h0NmVUo+muFfDMP5i7qGDeafRd22yLMiH4D8M//neKVY6zvUNpXTROg4I8tS E5lxt6uPZu9qQJby4gObblACkYsIOOnHFqXJl3bgxvx8qnJJT8s7qamQovVGap0FkSOV LgkgAOLwGKQAxAIoia5sLmp/Da3mrz4/ftxanJWVpo6FxcPilk2EWvzOFYLA6A2yjbyL Z33w== X-Gm-Message-State: AOAM5323vjf8HniGu7NzL1QXvChKkFmO/peCjHrF7YrULCF/p8yMsHFA rDj5Fcco5NVnDx9RfXxmVjh2MgKZcLM= X-Google-Smtp-Source: ABdhPJxyMuEQ/b0cIHA6rqLYR8WTArZrojG0HcGnlGJDBGromikyk+lksY1h4wbGUdDs9xgikh0eWw== X-Received: by 2002:adf:efca:: with SMTP id i10mr34201311wrp.316.1619599333415; Wed, 28 Apr 2021 01:42:13 -0700 (PDT) Received: from Red ([2a01:cb1d:3d5:a100:264b:feff:fe03:2806]) by smtp.googlemail.com with ESMTPSA id q7sm7313479wrr.62.2021.04.28.01.42.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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 Cc: linux-kernel@vger.kernel.org Subject: DMA mapping fill dma_address to 0 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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