Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752670Ab3HBAil (ORCPT ); Thu, 1 Aug 2013 20:38:41 -0400 Received: from mga03.intel.com ([143.182.124.21]:9857 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751022Ab3HBAij (ORCPT ); Thu, 1 Aug 2013 20:38:39 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.89,797,1367996400"; d="scan'208";a="340416799" Subject: Re: [PATCH 0/5] Enable Drivers for Intel MIC X100 Coprocessors. From: Sudeep Dutt To: Greg Kroah-Hartman Cc: Arnd Bergmann , Rusty Russell , "Michael S. Tsirkin" , Rob Landley , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-doc@vger.kernel.org, Nikhil Rao , Ashutosh Dixit , Caz Yokoyama , Dasaratharaman Chandramouli , Harshavardhan R Kharche , "Yaozu (Eddie) Dong" , Peter P Waskiewicz Jr , Sudeep Dutt In-Reply-To: <20130801014608.GD6941@kroah.com> References: <20130801014608.GD6941@kroah.com> Content-Type: text/plain; charset="UTF-8" Date: Thu, 01 Aug 2013 17:34:44 -0700 Message-ID: <1375403684.61060.66.camel@blbiskey-desk1.amr.corp.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 (2.28.3-30.el6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3820 Lines: 76 On Wed, 2013-07-31 at 18:46 -0700, Greg Kroah-Hartman wrote: > On Wed, Jul 24, 2013 at 08:31:31PM -0700, Sudeep Dutt wrote: > > An Intel MIC X100 device is a PCIe form factor add-in coprocessor > > card based on the Intel Many Integrated Core (MIC) architecture > > that runs a Linux OS. It is a PCIe endpoint in a platform and therefore > > implements the three required standard address spaces i.e. configuration, > > memory and I/O. The host OS loads a device driver as is typical for > > PCIe devices. The card itself runs a bootstrap after reset that > > transfers control to the card OS downloaded from the host driver. > > The card OS as shipped by Intel is a Linux kernel with modifications > > for the X100 devices. > > > > Since it is a PCIe card, it does not have the ability to host hardware > > devices for networking, storage and console. We provide these devices > > on X100 coprocessors thus enabling a self-bootable equivalent environment > > for applications. A key benefit of our solution is that it leverages > > the standard virtio framework for network, disk and console devices, > > though in our case the virtio framework is used across a PCIe bus. > > > > Here is a block diagram of the various components described above. The > > virtio backends are situated on the host rather than the card given better > > single threaded performance for the host compared to MIC and the ability of > > the host to initiate DMA's to/from the card using the MIC DMA engine. > > > > | > > +----------+ | +----------+ > > | Card OS | | | Host OS | > > +----------+ | +----------+ > > | > > +-------+ +--------+ +------+ | +---------+ +--------+ +--------+ > > | Virtio| |Virtio | |Virtio| | |Virtio | |Virtio | |Virtio | > > | Net | |Console | |Block | | |Net | |Console | |Block | > > | Driver| |Driver | |Driver| | |backend | |backend | |backend | > > +-------+ +--------+ +------+ | +---------+ +--------+ +--------+ > > | | | | | | | > > | | | |Ring 3| | | > > | | | |------|------------|---------|------- > > +-------------------+ |Ring 0+--------------------------+ > > | | | Virtio over PCIe IOCTLs | > > | | +--------------------------+ > > +--------------+ | | > > |Intel MIC | | +---------------+ > > |Card Driver | | |Intel MIC | > > +--------------+ | |Host Driver | > > | | +---------------+ > > | | | > > +-------------------------------------------------------------+ > > | | > > | PCIe Bus | > > +-------------------------------------------------------------+ > > That's some nice information, why isn't it in one of the patches you > sent, so that others can read it later on to try to figure out what is > going on with this codebase? > The description in the cover letter is also provided in PATCH 5 of the series @ Documentation/mic/mic_overview.txt [1]. Thanks, Sudeep Dutt [1] https://lkml.org/lkml/2013/7/24/812 > thanks, > > greg k-h -- 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/