Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275213AbTHGMJf (ORCPT ); Thu, 7 Aug 2003 08:09:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275249AbTHGMJf (ORCPT ); Thu, 7 Aug 2003 08:09:35 -0400 Received: from pc1-cwma1-5-cust4.swan.cable.ntl.com ([80.5.120.4]:46978 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S275213AbTHGMJe (ORCPT ); Thu, 7 Aug 2003 08:09:34 -0400 Subject: Re: [Q] How can I transfer data from hard disk to PCI device's memory From: Alan Cox To: "Cho, joon-woo" Cc: Linux Kernel Mailing List In-Reply-To: <005a01c35ca7$210f71e0$a5a5f88f@core8fyzomwjks> References: <005a01c35ca7$210f71e0$a5a5f88f@core8fyzomwjks> Content-Type: text/plain Content-Transfer-Encoding: 7bit Organization: Message-Id: <1060257946.3123.31.camel@dhcp22.swansea.linux.org.uk> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-5) Date: 07 Aug 2003 13:05:47 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 739 Lines: 21 On Iau, 2003-08-07 at 06:45, Cho, joon-woo wrote: > Hello. > > I want to transfer data 'directly' from hard disk to some PCI device which > has memory > > with the helpf of kernel(file system, device driver). The kernel doesn;t currently support this. The O_DIRECT I/O handling needs to know about stuff like page reference counts that PCI space doesn't have lots of older (and some current) hardware has real problems with PCI PCI transfers. So its a non trivial project, although doable - 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/