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Subject: Re: RFC : [PATCH V7 XRT Alveo 00/20] XRT Alveo driver overview
To:     Lizhi Hou <lizhi.hou@xilinx.com>, linux-kernel@vger.kernel.org,
        "Wu, Hao" <hao.wu@intel.com>, "mdf@kernel.org" <mdf@kernel.org>
Cc:     linux-fpga@vger.kernel.org, maxz@xilinx.com,
        sonal.santan@xilinx.com, yliu@xilinx.com, michal.simek@xilinx.com,
        stefanos@xilinx.com, devicetree@vger.kernel.org, robh@kernel.org
References: <20210528004959.61354-1-lizhi.hou@xilinx.com>
 <bdd31ecc-f6c5-392b-1609-f05efcba7f88@xilinx.com>
 <68e85a4f-4a10-1ff9-0443-aa565878c855@redhat.com>
 <8cffb27e-88c1-cbea-24cd-aae03aad4e2d@xilinx.com>
From:   Tom Rix <trix@redhat.com>
Message-ID: <58897550-33f9-c5ab-3bb0-0456579bb773@redhat.com>
Date:   Fri, 11 Jun 2021 05:46:05 -0700
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On 6/10/21 4:36 PM, Lizhi Hou wrote:
> Hi Tom,
>
>
> On 06/03/2021 07:23 AM, Tom Rix wrote:
>>
>>
>> On 6/2/21 3:34 PM, Lizhi Hou wrote:
>>> Hi Moritz and Tom,
>>>
>>> Thanks a lot for reviewing the XRT patches. This v7 patches contains
>>> our latest fixes for all review comments. And it seems auto build
>>> robot is happy with it as well. Do you have more comment against v7?
>>> What will be the next step for XRT patches if it looks ok to you?
>>
>> Please do not add any features to the patchset.
>>
>> When you add a feature, that tends to reset the review process.
>>
>>
>> For little stuff.
>>
>> I need to look at the documentation again, iirc that was the only issue
>> in v6.
>>
>>
>> For big stuff.
>>
>> At the beginning some possible refactor questions were raised, I don't
>> know if they have been resolved.
>>
>> ex/
>>
>> some of the leaf drivers like clock should be moved the clock subsystem
>>
>> the xrt/ dir vs existing flat, we don't want both.
>>
>> is your xrt bus consistent with dfl bus, can it support adding devices
>> outside of fpga/xrt
> It would be ideal if we make incremental changes to move xrt xleaf 
> drivers to other subsystems. One question comes to mind if xleaf 
> drivers move to different subsystems they would need to become 
> independent ko. That would require load/unload dependency management 
> complicating the design. Also if we go in that direction xdevice.h 
> should move to linux/include?

At this point this just general advice, when I look into it more I will 
provide some more concrete suggestions.

>>
>> how clean are the public headers
> Is there anything in the public header we need to change?

In the other passes, I looked more for small problems within the file.

Since this the public interface, it needs more attention than an interior h

>>
>>
>> Since flipflopping on refactoring is a painful, let's try to get a
>> consensus before moving forward.
>>
>> This may mean the patchset is committed by parts as it and the existing
>> code changes.
>>
>>
>> Lets start with the directory structure.
>>
>> Since there are a lot of files in xrt, the xrt/ makes sense.
>>
>> For other fpga's with a lot of files, say > 3, we need to change ex/
>>
>> dfl-foo.c to dfl/foo.c
>>
>> to be consistent.
>>
>>
>> The Kconfig and Makefiles for xrt/ and dfl/ would only be in that top
>> subdir.
>>
>> Which i think is a change for xrt/
>>
>>
>> I'll whip up something for dfl/ to move things along.
> We will wait for the new structure of dfl/ and make necessary for xrt/ 
> accordingly.
>
The new structure is being worked out now.

I'll post v3 shortly.

Please take a look and comment.

Tom

> Thanks,
> Lizhi
>>
>> Tom
>>
>>
>>>
>>> Thanks,
>>>
>>> Lizhi
>>>
>>>
>>> On 05/27/2021 05:49 PM, Lizhi Hou wrote:
>>>> Hello,
>>>>
>>>> This is V7 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 tools.
>>>> https://www.xilinx.com/products/design-tools/vitis/vitis-platform.html
>>>>
>>>> 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 *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
>>>> 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.
>>>>
>>>> TESTING AND VALIDATION
>>>>
>>>> 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:
>>>>
>>>> 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 v6:
>>>> - Resolved grammatical errors and cleaned up taxonomy in xrt.rst
>>>>    documentation.
>>>> - 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
>>>>    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 V6 version of patch series can be found here:
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-1-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-2-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-3-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-4-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-5-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-6-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-7-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-8-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-9-lizhi.hou@xilinx.com/ 
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-10-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-11-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-12-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-13-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-14-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-15-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-16-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-17-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-18-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-19-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-20-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>> https://lore.kernel.org/lkml/20210512015339.5649-21-lizhi.hou@xilinx.com/ 
>>>>
>>>>
>>>>
>>>> Lizhi Hou (20):
>>>>    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: VSEC driver
>>>>    fpga: xrt: User Clock Subsystem driver
>>>>    fpga: xrt: ICAP driver
>>>>    fpga: xrt: devctl xrt driver
>>>>    fpga: xrt: clock driver
>>>>    fpga: xrt: clock frequency counter driver
>>>>    fpga: xrt: DDR calibration 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 
>>>> ++++++++++++++++++
>>>>   MAINTAINERS                                   |  11 +
>>>>   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            | 131 +++
>>>>   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                 |  30 +
>>>>   drivers/fpga/xrt/lib/cdev.c                   | 209 +++++
>>>>   drivers/fpga/xrt/lib/group.c                  | 278 ++++++
>>>>   drivers/fpga/xrt/lib/lib-drv.c                | 328 +++++++
>>>>   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/clkfreq.c          | 223 +++++
>>>>   drivers/fpga/xrt/lib/xleaf/clock.c            | 652 +++++++++++++
>>>>   drivers/fpga/xrt/lib/xleaf/ddr_calibration.c  | 210 +++++
>>>>   drivers/fpga/xrt/lib/xleaf/devctl.c           | 169 ++++
>>>>   drivers/fpga/xrt/lib/xleaf/icap.c             | 328 +++++++
>>>>   drivers/fpga/xrt/lib/xleaf/ucs.c              | 152 +++
>>>>   drivers/fpga/xrt/lib/xleaf/vsec.c             | 372 ++++++++
>>>>   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                  | 420 +++++++++
>>>>   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/xrt/xclbin.h               | 409 ++++++++
>>>>   include/uapi/linux/xrt/xmgmt-ioctl.h          |  46 +
>>>>   53 files changed, 9988 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/clkfreq.c
>>>>   create mode 100644 drivers/fpga/xrt/lib/xleaf/clock.c
>>>>   create mode 100644 drivers/fpga/xrt/lib/xleaf/ddr_calibration.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/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/xrt/xclbin.h
>>>>   create mode 100644 include/uapi/linux/xrt/xmgmt-ioctl.h
>>>>
>>>
>>
>