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Date:   Tue, 26 Mar 2019 23:30:43 +0000
From:   Sonal Santan <sonals@...inx.com>
To:     Daniel Vetter <daniel@...ll.ch>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Cyril Chemparathy <cyrilc@...inx.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lizhi Hou <lizhih@...inx.com>,
        Michal Simek <michals@...inx.com>,
        "airlied@...hat.com" <airlied@...hat.com>
Subject: RE: [RFC PATCH Xilinx Alveo 0/6] Xilinx PCIe accelerator driver



> -----Original Message-----
> From: Daniel Vetter [mailto:daniel.vetter@...ll.ch] On Behalf Of Daniel Vetter
> Sent: Monday, March 25, 2019 1:28 PM
> To: Sonal Santan <sonals@...inx.com>
> Cc: dri-devel@...ts.freedesktop.org; gregkh@...uxfoundation.org; Cyril
> Chemparathy <cyrilc@...inx.com>; linux-kernel@...r.kernel.org; Lizhi Hou
> <lizhih@...inx.com>; Michal Simek <michals@...inx.com>; airlied@...hat.com
> Subject: Re: [RFC PATCH Xilinx Alveo 0/6] Xilinx PCIe accelerator driver
> 
> On Tue, Mar 19, 2019 at 02:53:55PM -0700, sonal.santan@...inx.com wrote:
> > From: Sonal Santan <sonal.santan@...inx.com>
> >
> > Hello,
> >
> > This patch series adds drivers for Xilinx Alveo PCIe accelerator cards.
> > These drivers are part of Xilinx Runtime (XRT) open source stack and
> > have been deployed by leading FaaS vendors and many enterprise
> customers.
> 
> Cool, first fpga driver submitted to drm! And from a high level I think this
> makes a lot of sense.
> 
> > PLATFORM ARCHITECTURE
> >
> > Alveo PCIe platforms have a static shell and a reconfigurable
> > (dynamic) region. The shell is automatically loaded from PROM when
> > host is booted and PCIe is enumerated by BIOS. Shell cannot be changed
> > till next cold reboot. The shell exposes two physical functions:
> > management physical function and user physical function.
> >
> > Users compile their high level design in C/C++/OpenCL or RTL into FPGA
> > image using SDx compiler. The FPGA image packaged as xclbin file can
> > be loaded onto reconfigurable region. The image may contain one or
> > more compute unit. Users can dynamically swap the full image running
> > on the reconfigurable region in order to switch between different
> workloads.
> >
> > XRT DRIVERS
> >
> > XRT Linux kernel driver xmgmt binds to mgmt pf. The driver is modular
> > and organized into several platform drivers which primarily handle the
> > following functionality:
> > 1.  ICAP programming (FPGA bitstream download with FPGA Mgr
> > integration) 2.  Clock scaling 3.  Loading firmware container also
> > called dsabin (embedded Microblaze
> >     firmware for ERT and XMC, optional clearing bitstream) 4.  In-band
> > sensors: temp, voltage, power, etc.
> > 5.  AXI Firewall management
> > 6.  Device reset and rescan
> > 7.  Hardware mailbox for communication between two physical functions
> >
> > XRT Linux kernel driver xocl binds to user pf. Like its peer, this
> > driver is also modular and organized into several platform drivers
> > which handle the following functionality:
> > 1.  Device memory topology discovery and memory management 2.  Buffer
> > object abstraction and management for client process 3.  XDMA MM PCIe
> > DMA engine programming 4.  Multi-process aware context management 5.
> > Compute unit execution management (optionally with help of ERT) for
> >     client processes
> > 6.  Hardware mailbox for communication between two physical functions
> >
> > The drivers export ioctls and sysfs nodes for various services. xocl
> > driver makes heavy use of DRM GEM features for device memory
> > management, reference counting, mmap support and export/import. xocl
> > also includes a simple scheduler called KDS which schedules compute
> > units and interacts with hardware scheduler running ERT firmware. The
> > scheduler understands custom opcodes packaged into command objects
> and
> > provides an asynchronous command done notification via POSIX poll.
> >
> > More details on architecture, software APIs, ioctl definitions,
> > execution model, etc. is available as Sphinx documentation--
> >
> > https://xilinx.github.io/XRT/2018.3/html/index.html
> >
> > The complete runtime software stack (XRT) which includes out of tree
> > kernel drivers, user space libraries, board utilities and firmware for
> > the hardware scheduler is open source and available at
> > https://github.com/Xilinx/XRT
> 
> Before digging into the implementation side more I looked into the userspace
> here. I admit I got lost a bit, since there's lots of indirections and abstractions
> going on, but it seems like this is just a fancy ioctl wrapper/driver backend
> abstractions. Not really something applications would use.
Sonal Santan <sonals@...inx.com>
	
4:20 PM (1 minute ago)
	
to me


> -----Original Message-----
> From: Daniel Vetter [mailto:daniel.vetter@...ll.ch] On Behalf Of Daniel Vetter
> Sent: Monday, March 25, 2019 1:28 PM
> To: Sonal Santan <sonals@...inx.com>
> Cc: dri-devel@...ts.freedesktop.org; gregkh@...uxfoundation.org; Cyril
> Chemparathy <cyrilc@...inx.com>; linux-kernel@...r.kernel.org; Lizhi Hou
> <lizhih@...inx.com>; Michal Simek <michals@...inx.com>; airlied@...hat.com
> Subject: Re: [RFC PATCH Xilinx Alveo 0/6] Xilinx PCIe accelerator driver
>
> On Tue, Mar 19, 2019 at 02:53:55PM -0700, sonal.santan@...inx.com wrote:
> > From: Sonal Santan <sonal.santan@...inx.com>
> >
> > Hello,
> >
> > This patch series adds drivers for Xilinx Alveo PCIe accelerator cards.
> > These drivers are part of Xilinx Runtime (XRT) open source stack and
> > have been deployed by leading FaaS vendors and many enterprise
> customers.
>
> Cool, first fpga driver submitted to drm! And from a high level I think this
> makes a lot of sense.
>
> > PLATFORM ARCHITECTURE
> >
> > Alveo PCIe platforms have a static shell and a reconfigurable
> > (dynamic) region. The shell is automatically loaded from PROM when
> > host is booted and PCIe is enumerated by BIOS. Shell cannot be changed
> > till next cold reboot. The shell exposes two physical functions:
> > management physical function and user physical function.
> >
> > Users compile their high level design in C/C++/OpenCL or RTL into FPGA
> > image using SDx compiler. The FPGA image packaged as xclbin file can
> > be loaded onto reconfigurable region. The image may contain one or
> > more compute unit. Users can dynamically swap the full image running
> > on the reconfigurable region in order to switch between different
> workloads.
> >
> > XRT DRIVERS
> >
> > XRT Linux kernel driver xmgmt binds to mgmt pf. The driver is modular
> > and organized into several platform drivers which primarily handle the
> > following functionality:
> > 1.  ICAP programming (FPGA bitstream download with FPGA Mgr
> > integration) 2.  Clock scaling 3.  Loading firmware container also
> > called dsabin (embedded Microblaze
> >     firmware for ERT and XMC, optional clearing bitstream) 4.  In-band
> > sensors: temp, voltage, power, etc.
> > 5.  AXI Firewall management
> > 6.  Device reset and rescan
> > 7.  Hardware mailbox for communication between two physical functions
> >
> > XRT Linux kernel driver xocl binds to user pf. Like its peer, this
> > driver is also modular and organized into several platform drivers
> > which handle the following functionality:
> > 1.  Device memory topology discovery and memory management 2.  Buffer
> > object abstraction and management for client process 3.  XDMA MM PCIe
> > DMA engine programming 4.  Multi-process aware context management 5.
> > Compute unit execution management (optionally with help of ERT) for
> >     client processes
> > 6.  Hardware mailbox for communication between two physical functions
> >
> > The drivers export ioctls and sysfs nodes for various services. xocl
> > driver makes heavy use of DRM GEM features for device memory
> > management, reference counting, mmap support and export/import. xocl
> > also includes a simple scheduler called KDS which schedules compute
> > units and interacts with hardware scheduler running ERT firmware. The
> > scheduler understands custom opcodes packaged into command objects
> and
> > provides an asynchronous command done notification via POSIX poll.
> >
> > More details on architecture, software APIs, ioctl definitions,
> > execution model, etc. is available as Sphinx documentation--
> >
> > https://xilinx.github.io/XRT/2018.3/html/index.html
> >
> > The complete runtime software stack (XRT) which includes out of tree
> > kernel drivers, user space libraries, board utilities and firmware for
> > the hardware scheduler is open source and available at
> > https://github.com/Xilinx/XRT
>
> Before digging into the implementation side more I looked into the userspace
> here. I admit I got lost a bit, since there's lots of indirections and abstractions
> going on, but it seems like this is just a fancy ioctl wrapper/driver backend
> abstractions. Not really something applications would use.
>

Appreciate your feedback. 

The userspace libraries define a common abstraction but have different implementations
for Zynq Ultrascale+ embedded platform, PCIe based Alveo (and Faas) and emulation
flows. The latter lets you run your application without physical hardware.

> 
> From the pretty picture on github it looks like there's some opencl/ml/other
> fancy stuff sitting on top that applications would use. Is that also available?

The full OpenCL runtime is available in the same repository. Xilinx ML Suite is
also based on XRT and its source can be found at https://github.com/Xilinx/ml-suite.

Typically end users use OpenCL APIs which are part of XRT stack. One can write an
application to directly call XRT APIs defined at 
https://xilinx.github.io/XRT/2018.3/html/xclhal2.main.html

Thanks,
-Sonal
> 
> Thanks, Daniel
> 
> >
> > Thanks,
> > -Sonal
> >
> > Sonal Santan (6):
> >   Add skeleton code: ioctl definitions and build hooks
> >   Global data structures shared between xocl and xmgmt drivers
> >   Add platform drivers for various IPs and frameworks
> >   Add core of XDMA driver
> >   Add management driver
> >   Add user physical function driver
> >
> >  drivers/gpu/drm/Kconfig                    |    2 +
> >  drivers/gpu/drm/Makefile                   |    1 +
> >  drivers/gpu/drm/xocl/Kconfig               |   22 +
> >  drivers/gpu/drm/xocl/Makefile              |    3 +
> >  drivers/gpu/drm/xocl/devices.h             |  954 +++++
> >  drivers/gpu/drm/xocl/ert.h                 |  385 ++
> >  drivers/gpu/drm/xocl/lib/Makefile.in       |   16 +
> >  drivers/gpu/drm/xocl/lib/cdev_sgdma.h      |   63 +
> >  drivers/gpu/drm/xocl/lib/libxdma.c         | 4368 ++++++++++++++++++++
> >  drivers/gpu/drm/xocl/lib/libxdma.h         |  596 +++
> >  drivers/gpu/drm/xocl/lib/libxdma_api.h     |  127 +
> >  drivers/gpu/drm/xocl/mgmtpf/Makefile       |   29 +
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-core.c    |  960 +++++
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-core.h    |  147 +
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-cw.c      |   30 +
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-ioctl.c   |  148 +
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-reg.h     |  244 ++
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-sysfs.c   |  318 ++
> >  drivers/gpu/drm/xocl/mgmtpf/mgmt-utils.c   |  399 ++
> >  drivers/gpu/drm/xocl/subdev/dna.c          |  356 ++
> >  drivers/gpu/drm/xocl/subdev/feature_rom.c  |  412 ++
> >  drivers/gpu/drm/xocl/subdev/firewall.c     |  389 ++
> >  drivers/gpu/drm/xocl/subdev/fmgr.c         |  198 +
> >  drivers/gpu/drm/xocl/subdev/icap.c         | 2859 +++++++++++++
> >  drivers/gpu/drm/xocl/subdev/mailbox.c      | 1868 +++++++++
> >  drivers/gpu/drm/xocl/subdev/mb_scheduler.c | 3059 ++++++++++++++
> >  drivers/gpu/drm/xocl/subdev/microblaze.c   |  722 ++++
> >  drivers/gpu/drm/xocl/subdev/mig.c          |  256 ++
> >  drivers/gpu/drm/xocl/subdev/sysmon.c       |  385 ++
> >  drivers/gpu/drm/xocl/subdev/xdma.c         |  510 +++
> >  drivers/gpu/drm/xocl/subdev/xmc.c          | 1480 +++++++
> >  drivers/gpu/drm/xocl/subdev/xvc.c          |  461 +++
> >  drivers/gpu/drm/xocl/userpf/Makefile       |   27 +
> >  drivers/gpu/drm/xocl/userpf/common.h       |  157 +
> >  drivers/gpu/drm/xocl/userpf/xocl_bo.c      | 1255 ++++++
> >  drivers/gpu/drm/xocl/userpf/xocl_bo.h      |  119 +
> >  drivers/gpu/drm/xocl/userpf/xocl_drm.c     |  640 +++
> >  drivers/gpu/drm/xocl/userpf/xocl_drv.c     |  743 ++++
> >  drivers/gpu/drm/xocl/userpf/xocl_ioctl.c   |  396 ++
> >  drivers/gpu/drm/xocl/userpf/xocl_sysfs.c   |  344 ++
> >  drivers/gpu/drm/xocl/version.h             |   22 +
> >  drivers/gpu/drm/xocl/xclbin.h              |  314 ++
> >  drivers/gpu/drm/xocl/xclfeatures.h         |  107 +
> >  drivers/gpu/drm/xocl/xocl_ctx.c            |  196 +
> >  drivers/gpu/drm/xocl/xocl_drm.h            |   91 +
> >  drivers/gpu/drm/xocl/xocl_drv.h            |  783 ++++
> >  drivers/gpu/drm/xocl/xocl_subdev.c         |  540 +++
> >  drivers/gpu/drm/xocl/xocl_thread.c         |   64 +
> >  include/uapi/drm/xmgmt_drm.h               |  204 +
> >  include/uapi/drm/xocl_drm.h                |  483 +++
> >  50 files changed, 28252 insertions(+)  create mode 100644
> > drivers/gpu/drm/xocl/Kconfig  create mode 100644
> > drivers/gpu/drm/xocl/Makefile  create mode 100644
> > drivers/gpu/drm/xocl/devices.h  create mode 100644
> > drivers/gpu/drm/xocl/ert.h  create mode 100644
> > drivers/gpu/drm/xocl/lib/Makefile.in
> >  create mode 100644 drivers/gpu/drm/xocl/lib/cdev_sgdma.h
> >  create mode 100644 drivers/gpu/drm/xocl/lib/libxdma.c
> >  create mode 100644 drivers/gpu/drm/xocl/lib/libxdma.h
> >  create mode 100644 drivers/gpu/drm/xocl/lib/libxdma_api.h
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/Makefile
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-core.c
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-core.h
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-cw.c
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-ioctl.c
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-reg.h
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-sysfs.c
> >  create mode 100644 drivers/gpu/drm/xocl/mgmtpf/mgmt-utils.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/dna.c  create mode
> > 100644 drivers/gpu/drm/xocl/subdev/feature_rom.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/firewall.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/fmgr.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/icap.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/mailbox.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/mb_scheduler.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/microblaze.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/mig.c  create mode
> > 100644 drivers/gpu/drm/xocl/subdev/sysmon.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/xdma.c
> >  create mode 100644 drivers/gpu/drm/xocl/subdev/xmc.c  create mode
> > 100644 drivers/gpu/drm/xocl/subdev/xvc.c  create mode 100644
> > drivers/gpu/drm/xocl/userpf/Makefile
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/common.h
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_bo.c
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_bo.h
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_drm.c
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_drv.c
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_ioctl.c
> >  create mode 100644 drivers/gpu/drm/xocl/userpf/xocl_sysfs.c
> >  create mode 100644 drivers/gpu/drm/xocl/version.h  create mode 100644
> > drivers/gpu/drm/xocl/xclbin.h  create mode 100644
> > drivers/gpu/drm/xocl/xclfeatures.h
> >  create mode 100644 drivers/gpu/drm/xocl/xocl_ctx.c  create mode
> > 100644 drivers/gpu/drm/xocl/xocl_drm.h  create mode 100644
> > drivers/gpu/drm/xocl/xocl_drv.h  create mode 100644
> > drivers/gpu/drm/xocl/xocl_subdev.c
> >  create mode 100644 drivers/gpu/drm/xocl/xocl_thread.c
> >  create mode 100644 include/uapi/drm/xmgmt_drm.h  create mode 100644
> > include/uapi/drm/xocl_drm.h
> >
> > --
> > 2.17.0
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

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