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/ > > +.. 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+ 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. 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