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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 9186CC2BB1D for ; Thu, 12 Mar 2020 13:13:14 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6A2D620663 for ; Thu, 12 Mar 2020 13:13:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="FE/DKRL7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6A2D620663 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0E5BD6EAAF; Thu, 12 Mar 2020 13:13:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 060F16E116; Thu, 12 Mar 2020 10:19:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Transfer-Encoding :Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=xfoxJqOJ26a7lwzPGQIADxdTJQgzT4rfzfYe/RpT1Rg=; b=FE/DKRL7ydDmayQrstwx7Edn2T ICP4V28DEgZAnyqOwrz63sQL8PyOVAPth60tktJM/OmYGM4GL8HAFHwASwOuunc/jhsehgiJ2Sdk1 cd5fknuPm6HcjTB2kpG1s/0qpuPhjyJb4IPOoDywlv/R9PMO+tk+P+cmivVFc1nJnOOwTAshVMoNd kQcN14MA2x6/DhEkQ2lb3huVbQcVe3oZdG2b4n4jz125IfFSXK98yWCcVwzIFhdpApojKjoSMYXUG 2xmz2Ht0NycVTMzJew0ryjyFxvWV/08VZkEHVkYeGwbeyyU4Rwpy0HR86OvpVbTI4jYxdVlzu9io/ SEgouFPQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jCKwJ-0003r2-Gt; Thu, 12 Mar 2020 10:19:43 +0000 Date: Thu, 12 Mar 2020 03:19:43 -0700 From: Christoph Hellwig To: christian.koenig@amd.com Message-ID: <20200312101943.GA14618@infradead.org> References: <20200311135158.3310-1-christian.koenig@amd.com> <20200311135158.3310-2-christian.koenig@amd.com> <20200311152838.GA24280@infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Mailman-Approved-At: Thu, 12 Mar 2020 13:13:09 +0000 Subject: Re: [Intel-gfx] [PATCH 1/6] lib/scatterlist: add sg_set_dma_addr() function X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David1.Zhou@amd.com, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Christoph Hellwig , jgg@ziepe.ca, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Mar 12, 2020 at 11:14:22AM +0100, Christian K=F6nig wrote: > > > The page pointer is set to NULL and only the DMA address, > > > length and offset values are valid. > > NAK. The only valid way to fill DMA address in scatterlists is > > dma_map_sg / dma_map_sg_attr. > = > How can we then map PCIe BARs into an scatterlist which are not backed by > struct pages? You can't. scatterlists by definition map memory backed by a struct page. If you want to map something else struct scatterlist is the wrong structure and you need to use something else (which you should anyway as struct scatterlist is a bad design patter, and the above is only one of the many issues with it). _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx