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

From: Kenneth Lee
Date: Thu Aug 02 2018 - 00:24:16 EST

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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@xxxxxxxxx>
> To: Kenneth Lee <nek.in.cn@xxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>,
> Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, "David S . Miller"
> <davem@xxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Alex Williamson
> <alex.williamson@xxxxxxxxxx>, Kenneth Lee <liguozhu@xxxxxxxxxxxxx>, Hao
> Fang <fanghao11@xxxxxxxxxx>, Zhou Wang <wangzhou1@xxxxxxxxxxxxx>, Zaibo Xu
> <xuzaibo@xxxxxxxxxx>, Philippe Ombredanne <pombredanne@xxxxxxxx>, Greg
> Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Thomas Gleixner
> <tglx@xxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx"
> <linux-doc@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx"
> <linux-kernel@xxxxxxxxxxxxxxx>, "linux-crypto@xxxxxxxxxxxxxxx"
> <linux-crypto@xxxxxxxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx"
> <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx"
> <kvm@xxxxxxxxxxxxxxx>, "linux-accelerators@xxxxxxxxxxxxxxxx"
> <linux-accelerators@xxxxxxxxxxxxxxxx>, Lu Baolu
> <baolu.lu@xxxxxxxxxxxxxxx>, "Kumar, Sanjay K" <sanjay.k.kumar@xxxxxxxxx>
> CC: "linuxarm@xxxxxxxxxx" <linuxarm@xxxxxxxxxx>
> Subject: RE: [RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive
> framework
> Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D191290F04@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
>
> > From: Kenneth Lee
> > Sent: Wednesday, August 1, 2018 6:22 PM
> >
> > From: Kenneth Lee <liguozhu@xxxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxxx>
> > ---
> > 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 @@
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> > + style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-
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> > + style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-
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> > + inkscape:connector-curvature="0"
> > + sodipodi:nodetypes="cc" />
> > + </g>
> > +</svg>
> > --
> > 2.17.1

--
-Kenneth(Hisilicon)

================================================================================
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