Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754840AbYLCWAk (ORCPT ); Wed, 3 Dec 2008 17:00:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751348AbYLCWAc (ORCPT ); Wed, 3 Dec 2008 17:00:32 -0500 Received: from mail-qy0-f11.google.com ([209.85.221.11]:39750 "EHLO mail-qy0-f11.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751315AbYLCWAb (ORCPT ); Wed, 3 Dec 2008 17:00:31 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=WnEYsBekrF4YXQMg/XTCGtr+g3v8wCBfezuuMZhGCagJKOOBubk9zacB5xMvHS0PrC WUhHm4o+HiScOO1kn/B5TX8tC362MtbXXxS1Pd5lxgGuHOgMEkX2wJq0nOgKofpT3ivU 8A1FYvg9UjegHSQw0wxuBGR/aliu1OcX+AXF0= Message-ID: Date: Wed, 3 Dec 2008 23:00:30 +0100 From: "Leon Woestenberg" To: edward_estabrook@agilent.com Subject: Re: [PATCH 1/1] Userspace I/O (UIO): Add support for userspace DMA Cc: linux-kernel@vger.kernel.org, hjk@linutronix.de, gregkh@suse.de, edward.estabrook@gmail.com, edward.estabrook.lkml@gmail.com In-Reply-To: <43FC624C55D8C746A914570B66D642610367F29B@cos-us-mb03.cos.agilent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <43FC624C55D8C746A914570B66D642610367F29B@cos-us-mb03.cos.agilent.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 777 Lines: 20 Hello Edward, On Wed, Dec 3, 2008 at 10:39 PM, wrote: > From: Edward Estabrook > > Here is a patch that adds the ability to dynamically allocate (and use) coherent DMA from userspace by extending the userspace IO driver. This patch applies against 2.6.28-rc6. > You are using a magic value to mmap(), just to keep options open: Would this in the future allow us to also add support for streaming non-coherent DMA directly into user space buffers? Regards, --- Leon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/