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 C6015C282DD for ; Fri, 10 Jan 2020 18:03:47 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 9328D2072E for ; Fri, 10 Jan 2020 18:03:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WtHuO11T" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9328D2072E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=roeck-us.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50240 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipydO-0000uT-OJ for qemu-devel@archiver.kernel.org; Fri, 10 Jan 2020 13:03:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53350) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipyca-0008UC-VK for qemu-devel@nongnu.org; Fri, 10 Jan 2020 13:02:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ipycZ-0008Tt-SX for qemu-devel@nongnu.org; Fri, 10 Jan 2020 13:02:56 -0500 Received: from mail-pj1-x1036.google.com ([2607:f8b0:4864:20::1036]:50752) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ipycZ-0008Ox-L8 for qemu-devel@nongnu.org; Fri, 10 Jan 2020 13:02:55 -0500 Received: by mail-pj1-x1036.google.com with SMTP id r67so1274952pjb.0 for ; Fri, 10 Jan 2020 10:02:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=ddNpVpIh534JySANnc05mdME2KsUv3D17Ou3oRSyvss=; b=WtHuO11TBpzSkjkgYye1kIhnMvCZOCoVwAPGmWHuLVZEhtxwS1NbkKzp0XPhBNO5Pb /bLDdZHHgUOR0OxHuPWZ2AjytIOWowYVj5Mnrp5fnLYblu/8gUk2g5Jd0z+E+3s/EO4x TijCrUKkj+D/ZeJu2dJ8I0BTbIgSJEYTU3YwvKvC9P2niokGH7dXflATNui8GWy6R4r5 CaK2VxBG2cEga6Em9O0B9M7ODY7HhaxjPPD/F5IOMkzoqz0kULJzX65YcXOnKYjS0lzP L27kL1x2aI/hWAfn/m2zlpJAb6EhRrVVvoj/MXU1qiw+JveVJOFHar/8kp/ZqVZBg+63 GJdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=ddNpVpIh534JySANnc05mdME2KsUv3D17Ou3oRSyvss=; b=YeslUIvFL8RUrk7zf52c4eEPUrt3T2DxqdENnXRlcn4KykyFZo4xbwwkpCu7DIEPtX 7kiHsmAml2+TCUbrs6fGrixwpv0Tx92YwRxo/035hhOXMynSFq+486P35z3VQ/hmf3pT CjHi5t8qzzP18A/pUg4cJ+gdpn27ip+govWjplbw0053gkjNdCMXCOa3lpyBwJiYxMUl fnnx6PTOc0LxUTM0TVAuHkjf3Q7LmtI2/gst9itxoYvlI81zD8yA4EZadzmwXox3/Qdk s/CMNgl+bSD4tF20fGvqlPoxdMEwOQqtrTT58PkG463aO8V/ZsTDGfHvckXpIcxptCRy 0uTg== X-Gm-Message-State: APjAAAVkJDvNYHQefZ5EYYYoz3eQjrfogP5RDVhh5/D7zz2rSe6A65SK PDvcS8xJ8ckhZzbsn9eBXyY= X-Google-Smtp-Source: APXvYqzLpaOQIPhT5Zym5wZtv4u+eo31rQ5uj23LO4kGKYorirwxIq8bj6OBqdRVLVLbA51KcmPe7g== X-Received: by 2002:a17:902:8a89:: with SMTP id p9mr5656012plo.126.1578679374365; Fri, 10 Jan 2020 10:02:54 -0800 (PST) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id y128sm3608140pfg.17.2020.01.10.10.02.52 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 10 Jan 2020 10:02:53 -0800 (PST) Date: Fri, 10 Jan 2020 10:02:51 -0800 From: Guenter Roeck To: Peter Maydell Subject: Re: How to tell DMA controller in qemu to terminate transfer ? Message-ID: <20200110180251.GA16140@roeck-us.net> References: <20200108183553.GA5608@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::1036 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Jan 10, 2020 at 10:36:20AM +0000, Peter Maydell wrote: > On Wed, 8 Jan 2020 at 18:36, Guenter Roeck wrote: > > > > Hi, > > > > I am trying to fix DMA support with Exynos4210. The original commit > > 59520dc65e ("hw/arm/exynos4210: Add DMA support for the Exynos4210") doesn't > > really work, primarily because it assigns wrong interrupt lines (no idea > > how I thought I tested that). > > > > Problem I have right now is that the pl330 peripheral DMA in Exynos4210 > > depends on a signal from the peripheral device (here: serial ports) > > to end a DMA transfer. To make this work, I need a signal from > > exynos4210_uart.c to pl330.c to terminate the DMA after the receive > > buffer is empty. > > > > How can I implement this in qemu ? > > That depends. How does the UART signal the DMA controller > in real hardware? If there's a signal line of some kind, > then you can model that with a qemu_irq line which the UART > exposes and raises/lowers at the right time, that's then > plumbed through by the SoC to the DMA controller. > Never mind my previous e-mail; the above was enough to get it working. Thanks! Guenter