[RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive framework
Tian, Kevin
kevin.tian at intel.com
Thu Aug 2 13:14:38 AEST 2018
> From: Kenneth Lee
> Sent: Wednesday, August 1, 2018 6:22 PM
>
> From: Kenneth Lee <liguozhu at 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...
> 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 at 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
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> Accelerator</tspan></text>
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> + </g>
> +</svg>
> --
> 2.17.1
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