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From: Pavel Machek <pavel@ucw.cz>
To: Kenneth Lee <nek.in.cn@gmail.com>
Cc: 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-kernel@vger.kernel.org,
	linux-crypto@vger.kernel.org, iommu@lists.linux-foundation.org,
	kvm@vger.kernel.org, linux-accelerators@lists.ozlabs.org,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Sanjay Kumar <sanjay.k.kumar@intel.com>,
	linuxarm@huawei.com
Subject: Re: [RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive framework
Date: Mon, 6 Aug 2018 14:27:33 +0200
Message-ID: <20180806122733.GA17232@xo-6d-61-c0.localdomain> (raw)
In-Reply-To: <20180801102221.5308-2-nek.in.cn@gmail.com>

Hi!

> WarpDrive is a common user space accelerator framework.  Its main component
> in Kernel is called spimdev, Share Parent IOMMU Mediated Device. It exposes

spimdev is really unfortunate name. It looks like it has something to do with SPI, but
it does not.

> +++ 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.

What is DPDK? ODP?

> +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.

VFIO? VF? HVF?

Also "gup" might be worth spelling out.

> +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 probl


I went through the docs, but I still don't know what it does.
											Pavel

  parent reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-01 10:22 [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive framework Kenneth Lee
2018-08-02  3:14   ` Tian, Kevin
2018-08-02  4:22     ` Kenneth Lee
2018-08-02  4:41       ` Tian, Kevin
2018-08-06 12:27   ` Pavel Machek [this message]
2018-08-08  1:43     ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 2/7] iommu: Add share domain interface in iommu for spimdev Kenneth Lee
2018-08-02  3:17   ` Tian, Kevin
2018-08-02  4:15     ` Kenneth Lee
2018-08-02  4:39       ` Tian, Kevin
2018-08-08  9:13   ` Joerg Roedel
2018-08-09  1:09     ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 3/7] vfio: add spimdev support Kenneth Lee
2018-08-01 16:23   ` Randy Dunlap
2018-08-02  3:07     ` Kenneth Lee
2018-08-02  3:21   ` Tian, Kevin
2018-08-02  3:47     ` Kenneth Lee
2018-08-02  4:24       ` Tian, Kevin
2018-08-02  7:34         ` Kenneth Lee
     [not found]           ` <20180802103528.0b863030.cohuck@redhat.com>
     [not found]             ` <20180802124327.403b10ab@t450s.home>
2018-08-06  1:40               ` Kenneth Lee
2018-08-06 15:49                 ` Alex Williamson
2018-08-06 16:34                   ` Raj, Ashok
2018-08-06 17:05                     ` Alex Williamson
2018-08-08  1:32                       ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 4/7] crypto: add hisilicon Queue Manager driver Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 5/7] crypto: Add Hisilicon Zip driver Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 6/7] crypto: add spimdev support to Hisilicon QM Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 7/7] vfio/spimdev: add user sample for spimdev Kenneth Lee
2018-08-01 16:56 ` [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive Jerome Glisse
2018-08-02  2:33   ` Tian, Kevin
2018-08-02  4:05     ` Kenneth Lee
2018-08-02 14:22       ` Jerome Glisse
2018-08-03  3:47         ` Kenneth Lee
2018-08-03 14:39           ` Jerome Glisse
2018-08-06  3:12             ` Kenneth Lee
2018-08-06 15:32               ` Jerome Glisse
2018-08-08  1:08                 ` Kenneth Lee
2018-08-08 15:18                   ` Jerome Glisse
2018-08-09  8:03                     ` Kenneth Lee
2018-08-09  8:31                       ` Tian, Kevin
2018-08-10  1:37                         ` Kenneth Lee
2018-08-09 14:46                       ` Jerome Glisse
2018-08-10  3:39                         ` Kenneth Lee
2018-08-10 13:12                           ` Jean-Philippe Brucker
2018-08-11 15:26                             ` Kenneth Lee
2018-08-13  9:29                               ` Kenneth Lee
2018-08-13 19:23                                 ` Jerome Glisse
2018-08-14  3:46                                   ` Kenneth Lee
2018-08-10 14:32                           ` Jerome Glisse
2018-08-11 14:44                             ` Kenneth Lee
2018-08-02 10:10     ` Alan Cox
2018-08-02 12:24       ` Xu Zaibo
2018-08-02 14:46       ` Jerome Glisse
2018-08-03 14:20         ` Alan Cox
2018-08-03 14:55           ` Jerome Glisse
2018-08-06  1:26           ` Kenneth Lee
2018-08-02  2:59 ` Tian, Kevin
2018-08-02  3:40   ` Kenneth Lee
2018-08-02  4:36     ` Tian, Kevin
2018-08-02  5:35       ` Kenneth Lee

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