> 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... > 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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