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SubjectRe: [PATCH V3 XRT Alveo 00/18] XRT Alveo driver overview
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Hi Moritz,


On 02/21/2021 12:43 PM, Moritz Fischer wrote:
> Lizhi,
>
> On Wed, Feb 17, 2021 at 10:40:01PM -0800, Lizhi Hou wrote:
>> Hello,
>>
>> This is V3 of patch series which adds management physical function driver for Xilinx
>> Alveo PCIe accelerator cards, https://www.xilinx.com/products/boards-and-kits/alveo.html
>> This driver is part of Xilinx Runtime (XRT) open source stack.
>>
>> XILINX ALVEO PLATFORM ARCHITECTURE
>>
>> Alveo PCIe FPGA based platforms have a static *shell* partition and a partial
>> re-configurable *user* partition. The shell partition is automatically loaded from
>> flash when host is booted and PCIe is enumerated by BIOS. Shell cannot be changed
>> till the next cold reboot. The shell exposes two PCIe physical functions:
>>
>> 1. management physical function
>> 2. user physical function
>>
>> The patch series includes Documentation/xrt.rst which describes Alveo platform,
>> XRT driver architecture and deployment model in more detail.
>>
>> Users compile their high level design in C/C++/OpenCL or RTL into FPGA image using
>> Vitis https://www.xilinx.com/products/design-tools/vitis/vitis-platform.html
>> tools. The compiled image is packaged as xclbin which contains partial bitstream
>> for the user partition and necessary metadata. Users can dynamically swap the image
>> running on the user partition in order to switch between different workloads by
>> loading different xclbins.
>>
>> XRT DRIVERS FOR XILINX ALVEO
>>
>> XRT Linux kernel driver *xmgmt* binds to management physical function of Alveo
>> platform. The modular driver framework is organized into several platform drivers
>> which primarily handle the following functionality:
>>
>> 1. Loading firmware container also called xsabin at driver attach time
>> 2. Loading of user compiled xclbin with FPGA Manager integration
>> 3. Clock scaling of image running on user partition
>> 4. In-band sensors: temp, voltage, power, etc.
>> 5. Device reset and rescan
>>
>> The platform drivers are packaged into *xrt-lib* helper module with well
>> defined interfaces. The module provides a pseudo-bus implementation for the
>> platform drivers. More details on the driver model can be found in
>> Documentation/xrt.rst.
>>
>> User physical function driver is not included in this patch series.
>>
>> LIBFDT REQUIREMENT
>>
>> XRT driver infrastructure uses Device Tree as a metadata format to discover
>> HW subsystems in the Alveo PCIe device. The Device Tree schema used by XRT
>> is documented in Documentation/xrt.rst. Unlike previous V1 and V2 version
>> of patch series, V3 version does not require export of libfdt symbols.
>>
>> TESTING AND VALIDATION
>>
>> xmgmt driver can be tested with full XRT open source stack which includes user
>> space libraries, board utilities and (out of tree) first generation user physical
>> function driver xocl. XRT open source runtime stack is available at
>> https://github.com/Xilinx/XRT
>>
>> Complete documentation for XRT open source stack including sections on Alveo/XRT
>> security and platform architecture can be found here:
>>
>> https://xilinx.github.io/XRT/master/html/index.html
>> https://xilinx.github.io/XRT/master/html/security.html
>> https://xilinx.github.io/XRT/master/html/platforms_partitions.html
>>
>> Changes since v2:
>> - Streamlined the driver framework into *xleaf*, *group* and *xroot*
>> - Updated documentation to show the driver model with examples
>> - Addressed kernel test robot errors
>> - Added a selftest for basic driver framework
>> - Documented device tree schema
>> - Removed need to export libfdt symbols
>>
>> Changes since v1:
>> - Updated the driver to use fpga_region and fpga_bridge for FPGA
>> programming
>> - Dropped platform drivers not related to PR programming to focus on XRT
>> core framework
>> - Updated Documentation/fpga/xrt.rst with information on XRT core framework
>> - Addressed checkpatch issues
>> - Dropped xrt- prefix from some header files
>>
>> For reference V1 version of patch series can be found here:
>>
>> https://lore.kernel.org/lkml/20201217075046.28553-1-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-2-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-3-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-4-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-5-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-6-sonals@xilinx.com/
>> https://lore.kernel.org/lkml/20201217075046.28553-7-sonals@xilinx.com/
>>
>> Lizhi Hou (18):
>> Documentation: fpga: Add a document describing XRT Alveo drivers
>> fpga: xrt: driver metadata helper functions
>> fpga: xrt: xclbin file helper functions
>> fpga: xrt: xrt-lib platform driver manager
>> fpga: xrt: group platform driver
>> fpga: xrt: platform driver infrastructure
>> fpga: xrt: management physical function driver (root)
>> fpga: xrt: main platform driver for management function device
>> fpga: xrt: fpga-mgr and region implementation for xclbin download
>> fpga: xrt: VSEC platform driver
>> fpga: xrt: UCS platform driver
>> fpga: xrt: ICAP platform driver
>> fpga: xrt: devctl platform driver
>> fpga: xrt: clock platform driver
>> fpga: xrt: clock frequence counter platform driver
>> fpga: xrt: DDR calibration platform driver
>> fpga: xrt: partition isolation platform driver
>> fpga: xrt: Kconfig and Makefile updates for XRT drivers
>>
>> Documentation/fpga/index.rst | 1 +
>> Documentation/fpga/xrt.rst | 842 ++++++++++++++++++++++
>> MAINTAINERS | 11 +
>> drivers/Makefile | 1 +
>> drivers/fpga/Kconfig | 2 +
>> drivers/fpga/Makefile | 4 +
>> drivers/fpga/xrt/Kconfig | 8 +
>> drivers/fpga/xrt/include/events.h | 48 ++
>> drivers/fpga/xrt/include/group.h | 27 +
>> drivers/fpga/xrt/include/metadata.h | 229 ++++++
>> drivers/fpga/xrt/include/subdev_id.h | 43 ++
>> drivers/fpga/xrt/include/xclbin-helper.h | 52 ++
>> drivers/fpga/xrt/include/xleaf.h | 276 +++++++
>> drivers/fpga/xrt/include/xleaf/axigate.h | 25 +
>> drivers/fpga/xrt/include/xleaf/calib.h | 30 +
>> drivers/fpga/xrt/include/xleaf/clkfreq.h | 23 +
>> drivers/fpga/xrt/include/xleaf/clock.h | 31 +
>> drivers/fpga/xrt/include/xleaf/devctl.h | 43 ++
>> drivers/fpga/xrt/include/xleaf/icap.h | 29 +
>> drivers/fpga/xrt/include/xleaf/ucs.h | 24 +
>> drivers/fpga/xrt/include/xmgmt-main.h | 37 +
>> drivers/fpga/xrt/include/xroot.h | 114 +++
>> drivers/fpga/xrt/lib/Kconfig | 16 +
>> drivers/fpga/xrt/lib/Makefile | 30 +
>> drivers/fpga/xrt/lib/cdev.c | 231 ++++++
>> drivers/fpga/xrt/lib/group.c | 265 +++++++
>> drivers/fpga/xrt/lib/main.c | 274 +++++++
>> drivers/fpga/xrt/lib/main.h | 17 +
>> drivers/fpga/xrt/lib/subdev.c | 871 +++++++++++++++++++++++
>> drivers/fpga/xrt/lib/subdev_pool.h | 53 ++
>> drivers/fpga/xrt/lib/xclbin.c | 394 ++++++++++
>> drivers/fpga/xrt/lib/xleaf/axigate.c | 298 ++++++++
>> drivers/fpga/xrt/lib/xleaf/calib.c | 226 ++++++
>> drivers/fpga/xrt/lib/xleaf/clkfreq.c | 221 ++++++
>> drivers/fpga/xrt/lib/xleaf/clock.c | 648 +++++++++++++++++
>> drivers/fpga/xrt/lib/xleaf/devctl.c | 206 ++++++
>> drivers/fpga/xrt/lib/xleaf/icap.c | 317 +++++++++
>> drivers/fpga/xrt/lib/xleaf/ucs.c | 235 ++++++
>> drivers/fpga/xrt/lib/xleaf/vsec.c | 359 ++++++++++
>> drivers/fpga/xrt/lib/xroot.c | 598 ++++++++++++++++
>> drivers/fpga/xrt/metadata/Kconfig | 12 +
>> drivers/fpga/xrt/metadata/Makefile | 16 +
>> drivers/fpga/xrt/metadata/metadata.c | 524 ++++++++++++++
>> drivers/fpga/xrt/mgmt/Kconfig | 15 +
>> drivers/fpga/xrt/mgmt/Makefile | 19 +
>> drivers/fpga/xrt/mgmt/fmgr-drv.c | 187 +++++
>> drivers/fpga/xrt/mgmt/fmgr.h | 28 +
>> drivers/fpga/xrt/mgmt/main-impl.h | 37 +
>> drivers/fpga/xrt/mgmt/main-region.c | 471 ++++++++++++
>> drivers/fpga/xrt/mgmt/main.c | 693 ++++++++++++++++++
>> drivers/fpga/xrt/mgmt/root.c | 342 +++++++++
>> include/uapi/linux/xrt/xclbin.h | 408 +++++++++++
>> include/uapi/linux/xrt/xmgmt-ioctl.h | 46 ++
>> 53 files changed, 9957 insertions(+)
>> create mode 100644 Documentation/fpga/xrt.rst
>> create mode 100644 drivers/fpga/xrt/Kconfig
>> create mode 100644 drivers/fpga/xrt/include/events.h
>> create mode 100644 drivers/fpga/xrt/include/group.h
>> create mode 100644 drivers/fpga/xrt/include/metadata.h
>> create mode 100644 drivers/fpga/xrt/include/subdev_id.h
>> create mode 100644 drivers/fpga/xrt/include/xclbin-helper.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/axigate.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/calib.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/clkfreq.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/clock.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/devctl.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/icap.h
>> create mode 100644 drivers/fpga/xrt/include/xleaf/ucs.h
>> create mode 100644 drivers/fpga/xrt/include/xmgmt-main.h
>> create mode 100644 drivers/fpga/xrt/include/xroot.h
>> create mode 100644 drivers/fpga/xrt/lib/Kconfig
>> create mode 100644 drivers/fpga/xrt/lib/Makefile
>> create mode 100644 drivers/fpga/xrt/lib/cdev.c
>> create mode 100644 drivers/fpga/xrt/lib/group.c
>> create mode 100644 drivers/fpga/xrt/lib/main.c
>> create mode 100644 drivers/fpga/xrt/lib/main.h
>> create mode 100644 drivers/fpga/xrt/lib/subdev.c
>> create mode 100644 drivers/fpga/xrt/lib/subdev_pool.h
>> create mode 100644 drivers/fpga/xrt/lib/xclbin.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/axigate.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/calib.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/clkfreq.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/clock.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/devctl.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/icap.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/ucs.c
>> create mode 100644 drivers/fpga/xrt/lib/xleaf/vsec.c
>> create mode 100644 drivers/fpga/xrt/lib/xroot.c
>> create mode 100644 drivers/fpga/xrt/metadata/Kconfig
>> create mode 100644 drivers/fpga/xrt/metadata/Makefile
>> create mode 100644 drivers/fpga/xrt/metadata/metadata.c
>> create mode 100644 drivers/fpga/xrt/mgmt/Kconfig
>> create mode 100644 drivers/fpga/xrt/mgmt/Makefile
>> create mode 100644 drivers/fpga/xrt/mgmt/fmgr-drv.c
>> create mode 100644 drivers/fpga/xrt/mgmt/fmgr.h
>> create mode 100644 drivers/fpga/xrt/mgmt/main-impl.h
>> create mode 100644 drivers/fpga/xrt/mgmt/main-region.c
>> create mode 100644 drivers/fpga/xrt/mgmt/main.c
>> create mode 100644 drivers/fpga/xrt/mgmt/root.c
>> create mode 100644 include/uapi/linux/xrt/xclbin.h
>> create mode 100644 include/uapi/linux/xrt/xmgmt-ioctl.h
>>
>> --
>> 2.18.4
>>
> Please fix the indents all across this patchset. Doesn't checkpatch with
> --strict complain about this?
checkpatch --strict did not complain. And we will fix this.
>
> Also more generally this looks like it should be a bus. Look at DFL for
> reference.
Tom asked the same question in 01/18 and Sonal replied. We may discuss
with that thread.

Thanks,
Lizhi
>
> - Moritz

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