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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 DEED3C76190 for ; Fri, 26 Jul 2019 07:41:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4C0820651 for ; Fri, 26 Jul 2019 07:41:22 +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="odlZrfIl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726001AbfGZHlV (ORCPT ); Fri, 26 Jul 2019 03:41:21 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:53592 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725869AbfGZHlV (ORCPT ); Fri, 26 Jul 2019 03:41:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=CkRUYquCWMephBCRC3VdcCQqImJr3TKhB4LMdEk0n1A=; b=odlZrfIlkXKhJZmlD4dVLgsGH 3YhqJbFVFnZ6h2nPNDn/l3tdVDyfS/kXIUf7kJN7AiPIylBSUr9oLbYrJDpY2H2X60xNE+4Pjex4T cyx9Mi6s6ruhU9WqfuQuvOMkAwJz1tX27V+I7CFgtrRO+GvIgMX2pgBVC151Xk4WJ1KMFzruOCmHX lL50Z709y1wUobslL+YEuH1VDVW+/8v2QaxzxnLSZ7o5NF8dA8ph7xZzgFVmYT3rJd7wf8IRmM6bz sh54BgcrfXeLETrUmSaM59rQ2tsEHQf//0f+eSslJyUVImjyrjjxTJDrIT612fv+fddYLWpLf5z7m SXckglUFw==; Received: from hch by bombadil.infradead.org with local (Exim 4.92 #3 (Red Hat Linux)) id 1hquqq-0006Rg-53; Fri, 26 Jul 2019 07:41:16 +0000 Date: Fri, 26 Jul 2019 00:41:16 -0700 From: Christoph Hellwig To: Tomasz Figa Cc: Jungo Lin , devicetree@vger.kernel.org, Sean Cheng =?utf-8?B?KOmEreaYh+W8mCk=?= , Frederic Chen =?utf-8?B?KOmZs+S/iuWFgyk=?= , Rynn Wu =?utf-8?B?KOWQs+iCsuaBqSk=?= , srv_heupstream , Rob Herring , Ryan Yu =?utf-8?B?KOS9meWtn+S/rik=?= , Frankie Chiu =?utf-8?B?KOmCseaWh+WHsSk=?= , Hans Verkuil , ddavenport@chromium.org, Sj Huang , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , Matthias Brugger , Mauro Carvalho Chehab , "list@263.net:IOMMU DRIVERS , Joerg Roedel , " , Linux Media Mailing List Subject: Re: [RFC, v3 9/9] media: platform: Add Mediatek ISP P1 shared memory device Message-ID: <20190726074116.GA19745@infradead.org> References: <20190611035344.29814-1-jungo.lin@mediatek.com> <20190611035344.29814-10-jungo.lin@mediatek.com> <20190701072532.GB137710@chromium.org> <1562297618.1212.46.camel@mtksdccf07> <1562313579.1212.73.camel@mtksdccf07> <1563870117.1212.455.camel@mtksdccf07> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Fri, Jul 26, 2019 at 02:15:14PM +0900, Tomasz Figa wrote: > Could you try dma_get_sgtable() with the SCP struct device and then > dma_map_sg() with the P1 struct device? Please don't do that. dma_get_sgtable is a pretty broken API (see the common near the arm implementation) and we should not add more users of it. If you want a piece of memory that can be mapped to multiple devices allocate it using alloc_pages and then just map it to each device.