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-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
