[RFC,1/7] vfio/spimdev: Add documents for WarpDrive framework

From: Kenneth Lee <liguozhu@hisilicon.com>


WarpDrive is a common user space accelerator framework.  Its main component
in Kernel is called spimdev, Share Parent IOMMU Mediated Device. It exposes
the hardware capabilities to the user space via vfio-mdev. So processes in
user land can obtain a "queue" by open the device and direct access the
hardware MMIO space or do DMA operation via VFIO interface.

WarpDrive is intended to be used with Jean Philippe Brucker's SVA patchset
(it is still in RFC stage) to support multi-process. But This is not a must.
Without the SVA patches, WarpDrive can still work for one process for every
hardware device.

This patch add detail documents for the framework.

Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>

---
 Documentation/00-INDEX                |   2 +
 Documentation/warpdrive/warpdrive.rst | 153 ++++++
 Documentation/warpdrive/wd-arch.svg   | 732 ++++++++++++++++++++++++++
 Documentation/warpdrive/wd.svg        | 526 ++++++++++++++++++
 4 files changed, 1413 insertions(+)
 create mode 100644 Documentation/warpdrive/warpdrive.rst
 create mode 100644 Documentation/warpdrive/wd-arch.svg
 create mode 100644 Documentation/warpdrive/wd.svg

-- 
2.17.1

On Thu, Aug 02, 2018 at 03:14:38AM +0000, Tian, Kevin wrote:
> Date: Thu, 2 Aug 2018 03:14:38 +0000

> From: "Tian, Kevin" <kevin.tian@intel.com>

> To: Kenneth Lee <nek.in.cn@gmail.com>, Jonathan Corbet <corbet@lwn.net>,

>  Herbert Xu <herbert@gondor.apana.org.au>, "David S . Miller"

>  <davem@davemloft.net>, Joerg Roedel <joro@8bytes.org>, Alex Williamson

>  <alex.williamson@redhat.com>, Kenneth Lee <liguozhu@hisilicon.com>, Hao

>  Fang <fanghao11@huawei.com>, Zhou Wang <wangzhou1@hisilicon.com>, Zaibo Xu

>  <xuzaibo@huawei.com>, Philippe Ombredanne <pombredanne@nexb.com>, Greg

>  Kroah-Hartman <gregkh@linuxfoundation.org>, Thomas Gleixner

>  <tglx@linutronix.de>, "linux-doc@vger.kernel.org"

>  <linux-doc@vger.kernel.org>, "linux-kernel@vger.kernel.org"

>  <linux-kernel@vger.kernel.org>, "linux-crypto@vger.kernel.org"

>  <linux-crypto@vger.kernel.org>, "iommu@lists.linux-foundation.org"

>  <iommu@lists.linux-foundation.org>, "kvm@vger.kernel.org"

>  <kvm@vger.kernel.org>, "linux-accelerators@lists.ozlabs.org"

>  <linux-accelerators@lists.ozlabs.org>, Lu Baolu

>  <baolu.lu@linux.intel.com>, "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>

> CC: "linuxarm@huawei.com" <linuxarm@huawei.com>

> Subject: RE: [RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive

>  framework

> Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D191290F04@SHSMSX101.ccr.corp.intel.com>

> 

> > From: Kenneth Lee

> > Sent: Wednesday, August 1, 2018 6:22 PM

> > 

> > From: Kenneth Lee <liguozhu@hisilicon.com>

> > 

> > WarpDrive is a common user space accelerator framework.  Its main

> > component

> > in Kernel is called spimdev, Share Parent IOMMU Mediated Device. It

> 

> Not sure whether "share parent IOMMU" is a good term here. better

> stick to what capabity you bring to user space, instead of describing

> internal trick...

Agree. The "SPI" is also strongly hint to "Share Peripheral Interrupt" or "Serial
Peripheral Interface". Personally I hate this name. But I cannot find a better
one. In the user space, we can use a impassible name (WarpDrive). But kernel
require a name point to its feature... maybe I should use "Process-Shared Mdev"
in next version?
> 

> > exposes

> > the hardware capabilities to the user space via vfio-mdev. So processes in

> > user land can obtain a "queue" by open the device and direct access the

> > hardware MMIO space or do DMA operation via VFIO interface.

> > 

> > WarpDrive is intended to be used with Jean Philippe Brucker's SVA patchset

> > (it is still in RFC stage) to support multi-process. But This is not a must.

> > Without the SVA patches, WarpDrive can still work for one process for

> > every

> > hardware device.

> > 

> > This patch add detail documents for the framework.

> > 

> > Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>

> > ---

> >  Documentation/00-INDEX                |   2 +

> >  Documentation/warpdrive/warpdrive.rst | 153 ++++++

> >  Documentation/warpdrive/wd-arch.svg   | 732

> > ++++++++++++++++++++++++++

> >  Documentation/warpdrive/wd.svg        | 526 ++++++++++++++++++

> >  4 files changed, 1413 insertions(+)

> >  create mode 100644 Documentation/warpdrive/warpdrive.rst

> >  create mode 100644 Documentation/warpdrive/wd-arch.svg

> >  create mode 100644 Documentation/warpdrive/wd.svg

> > 

> > diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX

> > index 2754fe83f0d4..9959affab599 100644

> > --- a/Documentation/00-INDEX

> > +++ b/Documentation/00-INDEX

> > @@ -410,6 +410,8 @@ vm/

> >  	- directory with info on the Linux vm code.

> >  w1/

> >  	- directory with documents regarding the 1-wire (w1) subsystem.

> > +warpdrive/

> > +	- directory with documents about WarpDrive accelerator

> > framework.

> >  watchdog/

> >  	- how to auto-reboot Linux if it has "fallen and can't get up". ;-)

> >  wimax/

> > diff --git a/Documentation/warpdrive/warpdrive.rst

> > b/Documentation/warpdrive/warpdrive.rst

> > new file mode 100644

> > index 000000000000..3792b2780ea6

> > --- /dev/null

> > +++ b/Documentation/warpdrive/warpdrive.rst

> > @@ -0,0 +1,153 @@

> > +Introduction of WarpDrive

> > +=========================

> > +

> > +*WarpDrive* is a general accelerator framework built on top of vfio.

> > +It can be taken as a light weight virtual function, which you can use

> > without

> > +*SR-IOV* like facility and can be shared among multiple processes.

> > +

> > +It can be used as the quick channel for accelerators, network adaptors or

> > +other hardware in user space. It can make some implementation simpler.

> > E.g.

> > +you can reuse most of the *netdev* driver and just share some ring buffer

> > to

> > +the user space driver for *DPDK* or *ODP*. Or you can combine the RSA

> > +accelerator with the *netdev* in the user space as a Web reversed proxy,

> > etc.

> > +

> > +The name *WarpDrive* is simply a cool and general name meaning the

> > framework

> > +makes the application faster. In kernel, the framework is called SPIMDEV,

> > +namely "Share Parent IOMMU Mediated Device".

> > +

> > +

> > +How does it work

> > +================

> > +

> > +*WarpDrive* takes the Hardware Accelerator as a heterogeneous

> > processor which

> > +can share some load for the CPU:

> > +

> > +.. image:: wd.svg

> > +        :alt: This is a .svg image, if your browser cannot show it,

> > +                try to download and view it locally

> > +

> > +So it provides the capability to the user application to:

> > +

> > +1. Send request to the hardware

> > +2. Share memory with the application and other accelerators

> > +

> > +These requirements can be fulfilled by VFIO if the accelerator can serve

> > each

> > +application with a separated Virtual Function. But a *SR-IOV* like VF (we

> > will

> > +call it *HVF* hereinafter) design is too heavy for the accelerator which

> > +service thousands of processes.

> > +

> > +And the *HVF* is not good for the scenario that a device keep most of its

> > +resource but share partial of the function to the user space. E.g. a *NIC*

> > +works as a *netdev* but share some hardware queues to the user

> > application to

> > +send packets direct to the hardware.

> > +

> > +*VFIO-mdev* can solve some of the problem here. But *VFIO-mdev* has

> > two problem:

> > +

> > +1. it cannot make use of its parent device's IOMMU.

> > +2. it is assumed to be openned only once.

> > +

> > +So it will need some add-on for better resource control and let the VFIO

> > +driver be aware of this.

> > +

> > +

> > +Architecture

> > +------------

> > +

> > +The full *WarpDrive* architecture is represented in the following class

> > +diagram:

> > +

> > +.. image:: wd-arch.svg

> > +        :alt: This is a .svg image, if your browser cannot show it,

> > +                try to download and view it locally

> > +

> > +The idea is: when a device is probed, it can be registered to the general

> > +framework, e.g. *netdev* or *crypto*, and the *SPIMDEV* at the same

> > time.

> > +

> > +If *SPIMDEV* is registered. A *mdev* creation interface is created. Then

> > the

> > +system administrator can create a *mdev* in the user space and set its

> > +parameters via its sysfs interfacev. But not like the other mdev

> > +implementation, hardware resource will not be allocated until it is opened

> > by

> > +an application.

> > +

> > +With this strategy, the hardware resource can be easily scheduled among

> > +multiple processes.

> > +

> > +

> > +The user API

> > +------------

> > +

> > +We adopt a polling style interface in the user space: ::

> > +

> > +        int wd_request_queue(int container, struct wd_queue *q,

> > +                             const char *mdev)

> > +        void wd_release_queue(struct wd_queue *q);

> > +

> > +        int wd_send(struct wd_queue *q, void *req);

> > +        int wd_recv(struct wd_queue *q, void **req);

> > +        int wd_recv_sync(struct wd_queue *q, void **req);

> > +

> > +the ..._sync() interface is a wrapper to the non sync version. They wait on

> > the

> > +device until the queue become available.

> > +

> > +Memory can be done by VFIO DMA API. Or the following helper function

> > can be

> > +adopted: ::

> > +

> > +        int wd_mem_share(struct wd_queue *q, const void *addr,

> > +                         size_t size, int flags);

> > +        void wd_mem_unshare(struct wd_queue *q, const void *addr, size_t

> > size);

> > +

> > +Todo: if the IOMMU support *ATS* or *SMMU* stall mode. mem share is

> > not

> > +necessary. This can be check with SPImdev sysfs interface.

> > +

> > +The user API is not mandatory. It is simply a suggestion and hint what the

> > +kernel interface is supposed to support.

> > +

> > +

> > +The user driver

> > +---------------

> > +

> > +*WarpDrive* expose the hardware IO space to the user process (via

> > *mmap*). So

> > +it will require user driver for implementing the user API. The following API

> > +is suggested for a user driver: ::

> > +

> > +        int open(struct wd_queue *q);

> > +        int close(struct wd_queue *q);

> > +        int send(struct wd_queue *q, void *req);

> > +        int recv(struct wd_queue *q, void **req);

> > +

> > +These callback enable the communication between the user application

> > and the

> > +device. You will still need the hardware-depend algorithm driver to access

> > the

> > +algorithm functionality of the accelerator itself.

> > +

> > +

> > +Multiple processes support

> > +==========================

> > +

> > +In the latest mainline kernel (4.18) when this document is written.

> > +Multi-process is not supported in VFIO yet.

> > +

> > +*JPB* has a patchset to enable this[2]_. We have tested it with our

> > hardware

> > +(which is known as *D06*). It works well. *WarpDrive* rely on them to

> > support

> > +multiple processes. If it is not enabled, *WarpDrive* can still work, but it

> > +support only one process, which will share the same io map table with

> > kernel

> > +(but the user application cannot access the kernel address, So it is not

> > going

> > +to be a security problem)

> > +

> > +

> > +Legacy Mode Support

> > +===================

> > +For the hardware on which IOMMU is not support, WarpDrive can run on

> > *NOIOMMU*

> > +mode.

> > +

> > +

> > +References

> > +==========

> > +.. [1] Accroding to the comment in in mm/gup.c, The *gup* is only safe

> > within

> > +       a syscall.  Because it can only keep the physical memory in place

> > +       without making sure the VMA will always point to it. Maybe we should

> > +       raise the VM_PINNED patchset (see

> > +       https://lists.gt.net/linux/kernel/1931993) again to solve this problem.

> > +.. [2] https://patchwork.kernel.org/patch/10394851/

> > +.. [3] https://zhuanlan.zhihu.com/p/35489035

> > +

> > +.. vim: tw=78

> > diff --git a/Documentation/warpdrive/wd-arch.svg

> > b/Documentation/warpdrive/wd-arch.svg

> > new file mode 100644

> > index 000000000000..1b3d1817c4ba

> > --- /dev/null

> > +++ b/Documentation/warpdrive/wd-arch.svg

> > @@ -0,0 +1,732 @@

> > +<?xml version="1.0" encoding="UTF-8" standalone="no"?>

> > +<!-- Created with Inkscape (http://www.inkscape.org/) -->

> > +

> > +<svg

> > +   xmlns:dc="http://purl.org/dc/elements/1.1/"

> > +   xmlns:cc="http://creativecommons.org/ns#"

> > +   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"

> > +   xmlns:svg="http://www.w3.org/2000/svg"

> > +   xmlns="http://www.w3.org/2000/svg"

> > +   xmlns:xlink="http://www.w3.org/1999/xlink"

> > +   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"

> > +   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"

> > +   width="210mm"

> > +   height="193mm"

> > +   viewBox="0 0 744.09449 683.85823"

> > +   id="svg2"

> > +   version="1.1"

> > +   inkscape:version="0.92.3 (2405546, 2018-03-11)"

> > +   sodipodi:docname="wd-arch.svg">

> > +  <defs

> > +     id="defs4">

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       id="linearGradient6830">

> > +      <stop

> > +         style="stop-color:#000000;stop-opacity:1;"

> > +         offset="0"

> > +         id="stop6832" />

> > +      <stop

> > +         style="stop-color:#000000;stop-opacity:0;"

> > +         offset="1"

> > +         id="stop6834" />

> > +    </linearGradient>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="translate(-89.949614,405.94594)" />

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       id="linearGradient5026">

> > +      <stop

> > +         style="stop-color:#f2f2f2;stop-opacity:1;"

> > +         offset="0"

> > +         id="stop5028" />

> > +      <stop

> > +         style="stop-color:#f2f2f2;stop-opacity:0;"

> > +         offset="1"

> > +         id="stop5030" />

> > +    </linearGradient>

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6" />

> > +    </filter>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-1"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="translate(175.77842,400.29111)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-0"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-9" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="18.960653"

> > +       markerHeight="11.194658"

> > +       refX="9.4803267"

> > +       refY="5.5973287"

> > +       orient="auto"

> > +       id="marker4613">

> > +      <rect

> > +         y="-5.1589785"

> > +         x="5.8504119"

> > +         height="10.317957"

> > +         width="10.317957"

> > +         id="rect4212"

> > +         style="fill:#ffffff;stroke:#000000;stroke-width:0.69143367;stroke-

> > miterlimit:4;stroke-dasharray:none"

> > +         transform="matrix(0.86111274,0.50841405,-

> > 0.86111274,0.50841405,0,0)">

> > +        <title

> > +           id="title4262">generation</title>

> > +      </rect>

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-9"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.2452511,0,0,0.98513016,-

> > 190.95632,540.33156)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-9-7"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.3742742,0,0,0.97786398,-

> > 234.52617,654.63367)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8-5"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9-0" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-6">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-1"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-9-4"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.3742912,0,0,2.0035845,-

> > 468.34428,342.56603)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8-54"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9-7" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1-8">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9-6"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1-8-8">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9-6-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-0">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-93"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-0-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-93-6"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter5382"

> > +       x="-0.089695387"

> > +       width="1.1793908"

> > +       y="-0.10052069"

> > +       height="1.2010413">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="0.86758925"

> > +         id="feGaussianBlur5384" />

> > +    </filter>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient6830"

> > +       id="linearGradient6836"

> > +       x1="362.73923"

> > +       y1="700.04059"

> > +       x2="340.4751"

> > +       y2="678.25488"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="translate(-23.771026,-135.76835)" />

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-6-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-1-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +  </defs>

> > +  <sodipodi:namedview

> > +     id="base"

> > +     pagecolor="#ffffff"

> > +     bordercolor="#666666"

> > +     borderopacity="1.0"

> > +     inkscape:pageopacity="0.0"

> > +     inkscape:pageshadow="2"

> > +     inkscape:zoom="0.98994949"

> > +     inkscape:cx="222.32868"

> > +     inkscape:cy="370.44492"

> > +     inkscape:document-units="px"

> > +     inkscape:current-layer="layer1"

> > +     showgrid="false"

> > +     inkscape:window-width="1916"

> > +     inkscape:window-height="1033"

> > +     inkscape:window-x="0"

> > +     inkscape:window-y="22"

> > +     inkscape:window-maximized="0"

> > +     fit-margin-right="0.3"

> > +     inkscape:snap-global="false" />

> > +  <metadata

> > +     id="metadata7">

> > +    <rdf:RDF>

> > +      <cc:Work

> > +         rdf:about="">

> > +        <dc:format>image/svg+xml</dc:format>

> > +        <dc:type

> > +           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />

> > +        <dc:title />

> > +      </cc:Work>

> > +    </rdf:RDF>

> > +  </metadata>

> > +  <g

> > +     inkscape:label="Layer 1"

> > +     inkscape:groupmode="layer"

> > +     id="layer1"

> > +     transform="translate(0,-368.50374)">

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3)"

> > +       id="rect4136-3-6"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="283.01144"

> > +       y="588.80896" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032);fill-

> > opacity:1;stroke:#000000;stroke-width:0.6465112"

> > +       id="rect4136-2"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="281.63498"

> > +       y="586.75739" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="294.21747"

> > +       y="612.50073"

> > +       id="text4138-6"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1"

> > +         x="294.21747"

> > +         y="612.50073"

> > +         style="font-size:15px;line-height:1.25">WarpDrive</tspan></text>

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-0)"

> > +       id="rect4136-3-6-3"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="548.7395"

> > +       y="583.15417" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-1);fill-

> > opacity:1;stroke:#000000;stroke-width:0.6465112"

> > +       id="rect4136-2-60"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="547.36304"

> > +       y="581.1026" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="557.83484"

> > +       y="602.32745"

> > +       id="text4138-6-6"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-2"

> > +         x="557.83484"

> > +         y="602.32745"

> > +         style="font-size:15px;line-height:1.25">user_driver</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4613)"

> > +       d="m 547.36304,600.78954 -156.58203,0.0691"

> > +       id="path4855"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8)"

> > +       id="rect4136-3-6-5-7"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.2452511,0,0,0.98513016,113.15182,641.02594)"

> > />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-9);fill-

> > opacity:1;stroke:#000000;stroke-width:0.71606314"

> > +       id="rect4136-2-6-3"

> > +       width="125.86729"

> > +       height="31.522341"

> > +       x="271.75983"

> > +       y="718.45435" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="306.29599"

> > +       y="746.50073"

> > +       id="text4138-6-2-6"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1"

> > +         x="306.29599"

> > +         y="746.50073"

> > +         style="font-size:15px;line-height:1.25">spimdev</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-2)"

> > +       d="m 329.57309,619.72453 5.0373,97.14447"

> > +       id="path4661-3"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-2-1)"

> > +       d="m 342.57219,830.63108 -5.67699,-79.2841"

> > +       id="path4661-3-4"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8-5)"

> > +       id="rect4136-3-6-5-7-3"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.3742742,0,0,0.97786398,101.09126,754.58534)"

> > />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-9-7);fill-

> > opacity:1;stroke:#000000;stroke-width:0.74946606"

> > +       id="rect4136-2-6-3-6"

> > +       width="138.90866"

> > +       height="31.289837"

> > +       x="276.13297"

> > +       y="831.44263" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="295.67819"

> > +       y="852.98224"

> > +       id="text4138-6-2-6-1"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0"

> > +         x="295.67819"

> > +         y="852.98224"

> > +         style="font-size:15px;line-height:1.25">Device Driver</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="349.31198"

> > +       y="829.46118"

> > +       id="text4138-6-2-6-1-6"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0-3"

> > +         x="349.31198"

> > +         y="829.46118"

> > +         style="font-size:15px;line-height:1.25">*</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="349.98282"

> > +       y="768.698"

> > +       id="text4138-6-2-6-1-6-2"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0-3-0"

> > +         x="349.98282"

> > +         y="768.698"

> > +         style="font-size:15px;line-height:1.25">1</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-2-6)"

> > +       d="m 568.1238,614.05402 0.51369,333.80219"

> > +       id="path4661-3-5"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;text-align:center;letter-spacing:0px;word-spacing:0px;text-

> > anchor:middle;fill:#000000;fill-opacity:1;stroke:none;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="371.8013"

> > +       y="664.62476"

> > +       id="text4138-6-2-6-1-6-2-5"><tspan

> > +         sodipodi:role="line"

> > +         x="371.8013"

> > +         y="664.62476"

> > +         id="tspan4274"

> > +         style="font-size:15px;line-

> > height:1.25">&lt;&lt;vfio&gt;&gt;</tspan><tspan

> > +         sodipodi:role="line"

> > +         x="371.8013"

> > +         y="683.37476"

> > +         id="tspan4305"

> > +         style="font-size:15px;line-height:1.25">resource

> > management</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="389.92969"

> > +       y="587.44836"

> > +       id="text4138-6-2-6-1-6-2-56"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0-3-0-9"

> > +         x="389.92969"

> > +         y="587.44836"

> > +         style="font-size:15px;line-height:1.25">1</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="528.64813"

> > +       y="600.08429"

> > +       id="text4138-6-2-6-1-6-3"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0-3-7"

> > +         x="528.64813"

> > +         y="600.08429"

> > +         style="font-size:15px;line-height:1.25">*</tspan></text>

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8-54)"

> > +       id="rect4136-3-6-5-7-4"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.3745874,0,0,1.8929066,-132.7754,556.04505)" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-9-4);fill-

> > opacity:1;stroke:#000000;stroke-width:1.07280123"

> > +       id="rect4136-2-6-3-4"

> > +       width="138.91039"

> > +       height="64.111"

> > +       x="42.321312"

> > +       y="704.8371" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="110.30745"

> > +       y="722.94025"

> > +       id="text4138-6-2-6-3"><tspan

> > +         sodipodi:role="line"

> > +         x="111.99202"

> > +         y="722.94025"

> > +         id="tspan4366"

> > +         style="font-size:15px;line-height:1.25;text-align:center;text-

> > anchor:middle">other standard </tspan><tspan

> > +         sodipodi:role="line"

> > +         x="110.30745"

> > +         y="741.69025"

> > +         id="tspan4368"

> > +         style="font-size:15px;line-height:1.25;text-align:center;text-

> > anchor:middle">framework</tspan><tspan

> > +         sodipodi:role="line"

> > +         x="110.30745"

> > +         y="760.44025"

> > +         style="font-size:15px;line-height:1.25;text-align:center;text-

> > anchor:middle"

> > +         id="tspan6840">(crypto/nic/others)</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-2-1-8)"

> > +       d="M 276.29661,849.04109 134.04449,771.90853"

> > +       id="path4661-3-4-8"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="313.70813"

> > +       y="730.06366"

> > +       id="text4138-6-2-6-36"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-7"

> > +         x="313.70813"

> > +         y="730.06366"

> > +         style="font-size:10px;line-

> > height:1.25">&lt;&lt;lkm&gt;&gt;</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;text-align:start;letter-spacing:0px;word-spacing:0px;text-

> > anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="343.81625"

> > +       y="786.44141"

> > +       id="text4138-6-2-6-1-6-2-5-7-5"><tspan

> > +         sodipodi:role="line"

> > +         x="343.81625"

> > +         y="786.44141"

> > +         style="font-size:15px;line-height:1.25;text-align:start;text-

> > anchor:start"

> > +         id="tspan2278">regist<tspan

> > +   style="text-align:start;text-anchor:start"

> > +   id="tspan2280">er as mdev with &quot;share </tspan></tspan><tspan

> > +         sodipodi:role="line"

> > +         x="343.81625"

> > +         y="805.19141"

> > +         style="font-size:15px;line-height:1.25;text-align:start;text-

> > anchor:start"

> > +         id="tspan2357"><tspan

> > +   style="text-align:start;text-anchor:start"

> > +   id="tspan2359">parent iommu&quot; attribu</tspan>te</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="29.145819"

> > +       y="833.44244"

> > +       id="text4138-6-2-6-1-6-2-5-7-5-2"><tspan

> > +         sodipodi:role="line"

> > +         x="29.145819"

> > +         y="833.44244"

> > +         id="tspan4301"

> > +         style="font-size:15px;line-height:1.25">register to other

> > subsystem</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="301.20813"

> > +       y="597.29437"

> > +       id="text4138-6-2-6-36-1"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-7-2"

> > +         x="301.20813"

> > +         y="597.29437"

> > +         style="font-size:10px;line-

> > height:1.25">&lt;&lt;user_lib&gt;&gt;</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;text-align:center;letter-spacing:0px;word-spacing:0px;text-

> > anchor:middle;fill:#000000;fill-opacity:1;stroke:none;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="649.09613"

> > +       y="774.4798"

> > +       id="text4138-6-2-6-1-6-2-5-3"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-1-0-3-0-4-6"

> > +         x="649.09613"

> > +         y="774.4798"

> > +         style="font-size:15px;line-

> > height:1.25">&lt;&lt;vfio&gt;&gt;</tspan><tspan

> > +         sodipodi:role="line"

> > +         x="649.09613"

> > +         y="793.2298"

> > +         id="tspan4274-7"

> > +         style="font-size:15px;line-height:1.25">Hardware

> > Accessing</tspan></text>

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;text-align:center;letter-spacing:0px;word-spacing:0px;text-

> > anchor:middle;fill:#000000;fill-opacity:1;stroke:none;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="371.01291"

> > +       y="529.23682"

> > +       id="text4138-6-2-6-1-6-2-5-36"><tspan

> > +         sodipodi:role="line"

> > +         x="371.01291"

> > +         y="529.23682"

> > +         id="tspan4305-3"

> > +         style="font-size:15px;line-height:1.25">wd user api</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       d="m 328.19325,585.87943 0,-23.57142"

> > +       id="path4348"

> > +       inkscape:connector-curvature="0" />

> > +    <ellipse

> > +       style="opacity:1;fill:#ffffff;fill-opacity:1;fill-

> > rule:evenodd;stroke:#000000;stroke-width:1;stroke-miterlimit:4;stroke-

> > dasharray:none;stroke-dashoffset:0"

> > +       id="path4350"

> > +       cx="328.01468"

> > +       cy="551.95081"

> > +       rx="11.607142"

> > +       ry="10.357142" />

> > +    <path

> > +       style="opacity:0.444;fill:url(#linearGradient6836);fill-opacity:1;fill-

> > rule:evenodd;stroke:none;stroke-width:1;stroke-miterlimit:4;stroke-

> > dasharray:none;stroke-dashoffset:0;filter:url(#filter5382)"

> > +       id="path4350-2"

> > +       sodipodi:type="arc"

> > +       sodipodi:cx="329.44327"

> > +       sodipodi:cy="553.37933"

> > +       sodipodi:rx="11.607142"

> > +       sodipodi:ry="10.357142"

> > +       sodipodi:start="0"

> > +       sodipodi:end="6.2509098"

> > +       d="m 341.05041,553.37933 a 11.607142,10.357142 0 0 1 -

> > 11.51349,10.35681 11.607142,10.357142 0 0 1 -11.69928,-10.18967

> > 11.607142,10.357142 0 0 1 11.32469,-10.52124 11.607142,10.357142 0 0 1

> > 11.88204,10.01988"

> > +       sodipodi:open="true" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;text-align:center;letter-spacing:0px;word-spacing:0px;text-

> > anchor:middle;fill:#000000;fill-opacity:1;stroke:none;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="543.91455"

> > +       y="978.22363"

> > +       id="text4138-6-2-6-1-6-2-5-36-3"><tspan

> > +         sodipodi:role="line"

> > +         x="543.91455"

> > +         y="978.22363"

> > +         id="tspan4305-3-67"

> > +         style="font-size:15px;line-

> > height:1.25">Device(Hardware)</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-2-6-2)"

> > +       d="m 347.51164,865.4527 153.19752,91.52439"

> > +       id="path4661-3-5-1"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;font-size:12px;line-

> > height:0%;font-family:sans-serif;letter-spacing:0px;word-

> > spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="343.6398"

> > +       y="716.47754"

> > +       id="text4138-6-2-6-1-6-2-5-7-5-2-6"><tspan

> > +         sodipodi:role="line"

> > +         x="343.6398"

> > +         y="716.47754"

> > +         id="tspan4301-4"

> > +         style="font-style:italic;font-variant:normal;font-weight:normal;font-

> > stretch:normal;font-size:15px;line-height:1.25;font-family:sans-serif;-

> > inkscape-font-specification:'sans-serif Italic';stroke-width:1px">Share

> > Parent's IOMMU mdev</tspan></text>

> > +  </g>

> > +</svg>

> > diff --git a/Documentation/warpdrive/wd.svg

> > b/Documentation/warpdrive/wd.svg

> > new file mode 100644

> > index 000000000000..87ab92ebfbc6

> > --- /dev/null

> > +++ b/Documentation/warpdrive/wd.svg

> > @@ -0,0 +1,526 @@

> > +<?xml version="1.0" encoding="UTF-8" standalone="no"?>

> > +<!-- Created with Inkscape (http://www.inkscape.org/) -->

> > +

> > +<svg

> > +   xmlns:dc="http://purl.org/dc/elements/1.1/"

> > +   xmlns:cc="http://creativecommons.org/ns#"

> > +   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"

> > +   xmlns:svg="http://www.w3.org/2000/svg"

> > +   xmlns="http://www.w3.org/2000/svg"

> > +   xmlns:xlink="http://www.w3.org/1999/xlink"

> > +   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"

> > +   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"

> > +   width="210mm"

> > +   height="116mm"

> > +   viewBox="0 0 744.09449 411.02338"

> > +   id="svg2"

> > +   version="1.1"

> > +   inkscape:version="0.92.3 (2405546, 2018-03-11)"

> > +   sodipodi:docname="wd.svg">

> > +  <defs

> > +     id="defs4">

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       id="linearGradient5026">

> > +      <stop

> > +         style="stop-color:#f2f2f2;stop-opacity:1;"

> > +         offset="0"

> > +         id="stop5028" />

> > +      <stop

> > +         style="stop-color:#f2f2f2;stop-opacity:0;"

> > +         offset="1"

> > +         id="stop5030" />

> > +    </linearGradient>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(2.7384117,0,0,0.91666329,-

> > 952.8283,571.10143)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="18.960653"

> > +       markerHeight="11.194658"

> > +       refX="9.4803267"

> > +       refY="5.5973287"

> > +       orient="auto"

> > +       id="marker4613">

> > +      <rect

> > +         y="-5.1589785"

> > +         x="5.8504119"

> > +         height="10.317957"

> > +         width="10.317957"

> > +         id="rect4212"

> > +         style="fill:#ffffff;stroke:#000000;stroke-width:0.69143367;stroke-

> > miterlimit:4;stroke-dasharray:none"

> > +         transform="matrix(0.86111274,0.50841405,-

> > 0.86111274,0.50841405,0,0)">

> > +        <title

> > +           id="title4262">generation</title>

> > +      </rect>

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-9"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.2452511,0,0,0.98513016,-

> > 190.95632,540.33156)" />

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-6">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-1"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1-8">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9-6"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-1-8-8">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-9-6-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-0">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-93"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-0-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-93-6"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-2-6-2">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-9-1-9"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-8"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.0104674,0,0,1.0052679,-

> > 218.642,661.15448)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9" />

> > +    </filter>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-8-2"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(2.1450559,0,0,1.0052679,-

> > 521.97704,740.76422)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8-5"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9-1" />

> > +    </filter>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-8-0"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +

> > gradientTransform="matrix(1.0104674,0,0,1.0052679,83.456748,660.20747

> > )" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-8-6"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-9-2" />

> > +    </filter>

> > +    <linearGradient

> > +       inkscape:collect="always"

> > +       xlink:href="#linearGradient5026"

> > +       id="linearGradient5032-3-84"

> > +       x1="353"

> > +       y1="211.3622"

> > +       x2="565.5"

> > +       y2="174.8622"

> > +       gradientUnits="userSpaceOnUse"

> > +       gradientTransform="matrix(1.9884948,0,0,0.94903536,-

> > 318.42665,564.37696)" />

> > +    <filter

> > +       inkscape:collect="always"

> > +       style="color-interpolation-filters:sRGB"

> > +       id="filter4169-3-5-4"

> > +       x="-0.031597666"

> > +       width="1.0631953"

> > +       y="-0.099812768"

> > +       height="1.1996255">

> > +      <feGaussianBlur

> > +         inkscape:collect="always"

> > +         stdDeviation="1.3307599"

> > +         id="feGaussianBlur4171-6-3-0" />

> > +    </filter>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-0-0">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-93-8"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +    <marker

> > +       markerWidth="11.227358"

> > +       markerHeight="12.355258"

> > +       refX="10"

> > +       refY="6.177629"

> > +       orient="auto"

> > +       id="marker4825-6-3">

> > +      <path

> > +         inkscape:connector-curvature="0"

> > +         id="path4757-1-1"

> > +         d="M 0.42024733,0.42806444 10.231357,6.3500844

> > 0.24347733,11.918544"

> > +         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />

> > +    </marker>

> > +  </defs>

> > +  <sodipodi:namedview

> > +     id="base"

> > +     pagecolor="#ffffff"

> > +     bordercolor="#666666"

> > +     borderopacity="1.0"

> > +     inkscape:pageopacity="0.0"

> > +     inkscape:pageshadow="2"

> > +     inkscape:zoom="0.98994949"

> > +     inkscape:cx="457.47339"

> > +     inkscape:cy="250.14781"

> > +     inkscape:document-units="px"

> > +     inkscape:current-layer="layer1"

> > +     showgrid="false"

> > +     inkscape:window-width="1916"

> > +     inkscape:window-height="1033"

> > +     inkscape:window-x="0"

> > +     inkscape:window-y="22"

> > +     inkscape:window-maximized="0"

> > +     fit-margin-right="0.3" />

> > +  <metadata

> > +     id="metadata7">

> > +    <rdf:RDF>

> > +      <cc:Work

> > +         rdf:about="">

> > +        <dc:format>image/svg+xml</dc:format>

> > +        <dc:type

> > +           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />

> > +        <dc:title></dc:title>

> > +      </cc:Work>

> > +    </rdf:RDF>

> > +  </metadata>

> > +  <g

> > +     inkscape:label="Layer 1"

> > +     inkscape:groupmode="layer"

> > +     id="layer1"

> > +     transform="translate(0,-641.33861)">

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5)"

> > +       id="rect4136-3-6-5"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(2.7384116,0,0,0.91666328,-284.06895,664.79751)"

> > />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3);fill-

> > opacity:1;stroke:#000000;stroke-width:1.02430749"

> > +       id="rect4136-2-6"

> > +       width="276.79272"

> > +       height="29.331528"

> > +       x="64.723419"

> > +       y="736.84473" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;line-height:0%;font-

> > family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-

> > opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-

> > linejoin:miter;stroke-opacity:1"

> > +       x="78.223282"

> > +       y="756.79803"

> > +       id="text4138-6-2"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9"

> > +         x="78.223282"

> > +         y="756.79803"

> > +         style="font-size:15px;line-height:1.25">user application (running by

> > the CPU</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6)"

> > +       d="m 217.67507,876.6738 113.40331,45.0758"

> > +       id="path4661"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-0)"

> > +       d="m 208.10197,767.69811 0.29362,76.03656"

> > +       id="path4661-6"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8)"

> > +       id="rect4136-3-6-5-3"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.0104673,0,0,1.0052679,28.128628,763.90722)" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-8);fill-

> > opacity:1;stroke:#000000;stroke-width:0.65159565"

> > +       id="rect4136-2-6-6"

> > +       width="102.13586"

> > +       height="32.16671"

> > +       x="156.83217"

> > +       y="842.91852" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;font-size:12px;line-

> > height:0%;font-family:sans-serif;letter-spacing:0px;word-

> > spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="188.58519"

> > +       y="864.47125"

> > +       id="text4138-6-2-8"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-0"

> > +         x="188.58519"

> > +         y="864.47125"

> > +         style="font-size:15px;line-height:1.25;stroke-

> > width:1px">MMU</tspan></text>

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8-5)"

> > +       id="rect4136-3-6-5-3-1"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(2.1450556,0,0,1.0052679,1.87637,843.51696)" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-8-2);fill-

> > opacity:1;stroke:#000000;stroke-width:0.94937181"

> > +       id="rect4136-2-6-6-0"

> > +       width="216.8176"

> > +       height="32.16671"

> > +       x="275.09283"

> > +       y="922.5282" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;font-size:12px;line-

> > height:0%;font-family:sans-serif;letter-spacing:0px;word-

> > spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="347.81482"

> > +       y="943.23291"

> > +       id="text4138-6-2-8-8"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-0-5"

> > +         x="347.81482"

> > +         y="943.23291"

> > +         style="font-size:15px;line-height:1.25;stroke-

> > width:1px">Memory</tspan></text>

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-8-6)"

> > +       id="rect4136-3-6-5-3-5"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.0104673,0,0,1.0052679,330.22737,762.9602)" />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-8-0);fill-

> > opacity:1;stroke:#000000;stroke-width:0.65159565"

> > +       id="rect4136-2-6-6-8"

> > +       width="102.13586"

> > +       height="32.16671"

> > +       x="458.93091"

> > +       y="841.9715" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;font-size:12px;line-

> > height:0%;font-family:sans-serif;letter-spacing:0px;word-

> > spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="490.68393"

> > +       y="863.52423"

> > +       id="text4138-6-2-8-6"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-0-2"

> > +         x="490.68393"

> > +         y="863.52423"

> > +         style="font-size:15px;line-height:1.25;stroke-

> > width:1px">IOMMU</tspan></text>

> > +    <rect

> > +       style="fill:#000000;stroke:#000000;stroke-

> > width:0.6465112;filter:url(#filter4169-3-5-4)"

> > +       id="rect4136-3-6-5-6"

> > +       width="101.07784"

> > +       height="31.998148"

> > +       x="128.74678"

> > +       y="80.648842"

> > +       transform="matrix(1.9884947,0,0,0.94903537,167.19229,661.38193)"

> > />

> > +    <rect

> > +       style="fill:url(#linearGradient5032-3-84);fill-

> > opacity:1;stroke:#000000;stroke-width:0.88813609"

> > +       id="rect4136-2-6-2"

> > +       width="200.99274"

> > +       height="30.367374"

> > +       x="420.4675"

> > +       y="735.97351" />

> > +    <text

> > +       xml:space="preserve"

> > +       style="font-style:normal;font-weight:normal;font-size:12px;line-

> > height:0%;font-family:sans-serif;letter-spacing:0px;word-

> > spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-

> > linecap:butt;stroke-linejoin:miter;stroke-opacity:1"

> > +       x="441.95297"

> > +       y="755.9068"

> > +       id="text4138-6-2-9"><tspan

> > +         sodipodi:role="line"

> > +         id="tspan4140-1-9-9"

> > +         x="441.95297"

> > +         y="755.9068"

> > +         style="font-size:15px;line-height:1.25;stroke-width:1px">Hardware

> > Accelerator</tspan></text>

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-0-0)"

> > +       d="m 508.2914,766.55885 0.29362,76.03656"

> > +       id="path4661-6-1"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +    <path

> > +       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-

> > width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-

> > opacity:1;marker-end:url(#marker4825-6-3)"

> > +       d="M 499.70201,876.47297 361.38296,920.80258"

> > +       id="path4661-1"

> > +       inkscape:connector-curvature="0"

> > +       sodipodi:nodetypes="cc" />

> > +  </g>

> > +</svg>

> > --

> > 2.17.1


-- 
			-Kenneth(Hisilicon)

================================================================================
本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁
止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中
的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！
This e-mail and its attachments contain confidential information from HUAWEI,
which is intended only for the person or entity whose address is listed above.
Any use of the 
information contained herein in any way (including, but not limited to, total or
partial disclosure, reproduction, or dissemination) by persons other than the
intended 
recipient(s) is prohibited. If you receive this e-mail in error, please notify
the sender by phone or email immediately and delete it!

> From: Kenneth Lee

> Sent: Thursday, August 2, 2018 12:23 PM

> 

> On Thu, Aug 02, 2018 at 03:14:38AM +0000, Tian, Kevin wrote:

> >

> > > From: Kenneth Lee

> > > Sent: Wednesday, August 1, 2018 6:22 PM

> > >

> > > From: Kenneth Lee <liguozhu@hisilicon.com>

> > >

> > > WarpDrive is a common user space accelerator framework.  Its main

> > > component

> > > in Kernel is called spimdev, Share Parent IOMMU Mediated Device. It

> >

> > Not sure whether "share parent IOMMU" is a good term here. better

> > stick to what capabity you bring to user space, instead of describing

> > internal trick...

> Agree. The "SPI" is also strongly hint to "Share Peripheral Interrupt" or

> "Serial

> Peripheral Interface". Personally I hate this name. But I cannot find a better

> one. In the user space, we can use a impassible name (WarpDrive). But

> kernel

> require a name point to its feature... maybe I should use "Process-Shared

> Mdev"

> in next version?


or maybe no new name. Just stick to mdev but introducing some
new attribute/capability to indicate such purpose.

Thanks
Kevin