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=-1.1 required=3.0 tests=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 AE237C433DF for ; Sun, 21 Jun 2020 20:45:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86DB322210 for ; Sun, 21 Jun 2020 20:45:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="FkLGPmO6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730288AbgFUUpR (ORCPT ); Sun, 21 Jun 2020 16:45:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729166AbgFUUpQ (ORCPT ); Sun, 21 Jun 2020 16:45:16 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A3406C061794; Sun, 21 Jun 2020 13:45:16 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id f18so13886088qkh.1; Sun, 21 Jun 2020 13:45:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=69sqAb6PtzlOsETgOwIYJYItUN2UtrTOjmN+peBeU4Y=; b=FkLGPmO6WWMaOWhz7QB1DTT1SNCpG15DKCCzcR+MAGi4ZgbjTxdPI55Hq36CFGSQzW 8oSyqiUbotqFVhiaq1QWQIGYVUA299Z3siJYQmHGXo+mRcvSZd5YC2AW8RBrPyM0AASx /uAL10MwAvhBDrLVhPHHGbThOvw96h2CibArNvwmXI2aypOB8IV2M9sDXFsZi26R+d18 FD5Q26rPDiXzdTB/nnLafLn+YHDEJCFe31+aiZXVFjMFSz0fzibZW1C//7/6MmJKbb9/ FJQGp0lKvu5UnBVVNIviyBUoQLCIta/f+KQPMr1Q4+PW53i9xmFld8c1l3Oqf/kEJ1Qy nQVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=69sqAb6PtzlOsETgOwIYJYItUN2UtrTOjmN+peBeU4Y=; b=qyipkjao6eg1tnZiMT1k2usIShQ/h41p7jmpPc3bzAj+HBUmirRJrn2jlO1hYRNCbT ooSR2ZjZkQbWT52zPcrNmlsPLbVk1oO1nkkKn24yWasfzNXo4kWqhaPZ0kIiNI4fr0rX gRQci0ZF5VKEABAOqsqRTo8Vg0b0nLCxNJO34XGQAUEtf3Xzsffhk7/MB2RYx4xuTUKe +Bas5m3Z1l2i5pOjVx8Cd0NJaZ42ispMHRcluGGSyzLAtK7GFfWiLqa3enMYguNkDF/j YKe8cXCYzJMOMUT1RI63WmE7TtBk4z9EQT9gQkNa11tSpYCKpuRbgpZt1d6+epwt20pl 46wA== X-Gm-Message-State: AOAM533en4G3oyyMa9grP7NPB9JBexhQu0liDpUEiFAxAHzy+XBDuTss FN3UCZ77VTBtFHDwMkq+1je00CduyA9dXcnIKxhJyQ== X-Google-Smtp-Source: ABdhPJzEY1SgrXXhiYAmpZU8YmTa1NSk+ahX+IyukV0zAijACbGafncE+jVsQuZG2+qUUklMuyf8ZgFokFB4w9d3Nwg= X-Received: by 2002:a37:9147:: with SMTP id t68mr608599qkd.34.1592772315942; Sun, 21 Jun 2020 13:45:15 -0700 (PDT) MIME-Version: 1.0 References: <5614531.lOV4Wx5bFT@harkonnen> <20200621072457.GA2324254@vkoul-mobl> <20200621203634.y3tejmh6j4knf5iz@cwe-513-vol689.cern.ch> In-Reply-To: <20200621203634.y3tejmh6j4knf5iz@cwe-513-vol689.cern.ch> From: Richard Weinberger Date: Sun, 21 Jun 2020 22:45:04 +0200 Message-ID: Subject: Re: DMA Engine: Transfer From Userspace To: Federico Vaga Cc: Vinod Koul , Dave Jiang , Dan Williams , dmaengine@vger.kernel.org, LKML Content-Type: text/plain; charset="UTF-8" Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org On Sun, Jun 21, 2020 at 10:37 PM Federico Vaga wrote: > >Federico, what use case do you have in mind? > > Userspace drivers Is using vfio an option? -- Thanks, //richard