[PATCH V9 XRT Alveo 00/14] XRT Alveo driver overview

From: Lizhi Hou
Date: Mon Aug 02 2021 - 12:05:35 EST


This is V9 of patch series which adds management physical function driver
for Xilinx Alveo PCIe accelerator cards.

This driver is part of Xilinx Runtime (XRT) open source stack.


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 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 Linux kernel driver *xrt-mgmt* 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

User physical function driver is not included in this patch series.


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.


xrt-mgmt 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:


Changes since v8:
- added comments for struct xrt_device, struct xrt_driver.
- removed module version

Changes since v7:
- Followed review comment to remove non fpga subdevices:
clock, clkfrq, ucs, ddr_calibaration, devctl and vsec
- Collapsed include/uapi/linux/xrt/*.h into include/uapi/linux/fpga-xrt.h
- Cleaned up comments in fpga-xrt.h
- Fixed spelling errors in xrt.rst

Changes since v6:
- Resolved grammatical errors and cleaned up taxonomy in xrt.rst
- Fixed clang warnings.
- Updated code base to include v6 code review comments.

Changes since v5:
- Revert all changes 'mgnt/MGNT' back to 'mgmt/MGMT'
- Updated code base to include v5 code review comments.
xrt.rst: address grammar and taxonomy
subdev_id.h: defines XRT_SUBDEV_INVALID = 0
xclbin.c: change shift operation to be_to_cpu
- Resolved kernel test robot errors.

Changes since v4:
- Added xrt_bus_type and xrt_device. All sub devices were changed from
platform_bus_type/platform_device to xrt_bus_type/xrt_device.
- Renamed xrt-mgmt driver to xrt-mgnt driver.
- Replaced 'MGMT' with 'MGNT' and 'mgmt' with 'mgnt' in code and file names
- Moved pci function calls from infrastructure to xrt-mgnt driver.
- Renamed files: mgmt/main.c -> mgnt/xmgnt-main.c
mgmt/main-region.c -> mgnt/xmgnt-main-region.c
include/xmgmt-main.h -> include/xmgnt-main.h
mgmt/fmgr-drv.c -> mgnt/xrt-mgr.c
mgmt/fmgr.h -> mgnt/xrt-mgr.h
- Updated code base to include v4 code review comments.

Changes since v3:
- Leaf drivers use regmap-mmio to access hardware registers.
- Renamed driver module: xmgmt.ko -> xrt-mgmt.ko
- Renamed files: calib.[c|h] -> ddr_calibration.[c|h],
lib/main.[c|h] -> lib/lib-drv.[c|h],
mgmt/main-impl.h - > mgmt/xmgnt.h
- Updated code base to include v3 code review comments.

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
- 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 V8 version of patch series can be found here:

Lizhi Hou (14):
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 driver manager
fpga: xrt: group driver
fpga: xrt: char dev node helper functions
fpga: xrt: root driver infrastructure
fpga: xrt: driver infrastructure
fpga: xrt: management physical function driver (root)
fpga: xrt: main driver for management function device
fpga: xrt: fpga-mgr and region implementation for xclbin download
fpga: xrt: ICAP driver
fpga: xrt: partition isolation driver
fpga: xrt: Kconfig and Makefile updates for XRT drivers

Documentation/fpga/index.rst | 1 +
Documentation/fpga/xrt.rst | 870 ++++++++++++++++++
drivers/Makefile | 1 +
drivers/fpga/Kconfig | 2 +
drivers/fpga/Makefile | 5 +
drivers/fpga/xrt/Kconfig | 8 +
drivers/fpga/xrt/include/events.h | 45 +
drivers/fpga/xrt/include/group.h | 25 +
drivers/fpga/xrt/include/metadata.h | 236 +++++
drivers/fpga/xrt/include/subdev_id.h | 39 +
drivers/fpga/xrt/include/xclbin-helper.h | 48 +
drivers/fpga/xrt/include/xdevice.h | 141 +++
drivers/fpga/xrt/include/xleaf.h | 205 +++++
drivers/fpga/xrt/include/xleaf/axigate.h | 23 +
drivers/fpga/xrt/include/xleaf/clkfreq.h | 21 +
drivers/fpga/xrt/include/xleaf/clock.h | 29 +
.../fpga/xrt/include/xleaf/ddr_calibration.h | 28 +
drivers/fpga/xrt/include/xleaf/devctl.h | 40 +
drivers/fpga/xrt/include/xleaf/icap.h | 27 +
drivers/fpga/xrt/include/xmgmt-main.h | 34 +
drivers/fpga/xrt/include/xroot.h | 117 +++
drivers/fpga/xrt/lib/Kconfig | 17 +
drivers/fpga/xrt/lib/Makefile | 24 +
drivers/fpga/xrt/lib/cdev.c | 209 +++++
drivers/fpga/xrt/lib/group.c | 278 ++++++
drivers/fpga/xrt/lib/lib-drv.c | 318 +++++++
drivers/fpga/xrt/lib/lib-drv.h | 21 +
drivers/fpga/xrt/lib/subdev.c | 859 +++++++++++++++++
drivers/fpga/xrt/lib/subdev_pool.h | 53 ++
drivers/fpga/xrt/lib/xclbin.c | 381 ++++++++
drivers/fpga/xrt/lib/xleaf/axigate.c | 325 +++++++
drivers/fpga/xrt/lib/xleaf/icap.c | 328 +++++++
drivers/fpga/xrt/lib/xroot.c | 536 +++++++++++
drivers/fpga/xrt/metadata/Kconfig | 12 +
drivers/fpga/xrt/metadata/Makefile | 16 +
drivers/fpga/xrt/metadata/metadata.c | 578 ++++++++++++
drivers/fpga/xrt/mgmt/Kconfig | 15 +
drivers/fpga/xrt/mgmt/Makefile | 19 +
drivers/fpga/xrt/mgmt/root.c | 418 +++++++++
drivers/fpga/xrt/mgmt/xmgmt-main-region.c | 483 ++++++++++
drivers/fpga/xrt/mgmt/xmgmt-main.c | 662 +++++++++++++
drivers/fpga/xrt/mgmt/xmgmt.h | 33 +
drivers/fpga/xrt/mgmt/xrt-mgr.c | 190 ++++
drivers/fpga/xrt/mgmt/xrt-mgr.h | 16 +
include/uapi/linux/fpga-xrt.h | 428 +++++++++
46 files changed, 8175 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/xdevice.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/clkfreq.h
create mode 100644 drivers/fpga/xrt/include/xleaf/clock.h
create mode 100644 drivers/fpga/xrt/include/xleaf/ddr_calibration.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/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/lib-drv.c
create mode 100644 drivers/fpga/xrt/lib/lib-drv.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/icap.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/root.c
create mode 100644 drivers/fpga/xrt/mgmt/xmgmt-main-region.c
create mode 100644 drivers/fpga/xrt/mgmt/xmgmt-main.c
create mode 100644 drivers/fpga/xrt/mgmt/xmgmt.h
create mode 100644 drivers/fpga/xrt/mgmt/xrt-mgr.c
create mode 100644 drivers/fpga/xrt/mgmt/xrt-mgr.h
create mode 100644 include/uapi/linux/fpga-xrt.h