DARWIN: add initial platform_manager.json config

[adamcalabrigo]

Description

Adds initial platform_manager support for DARWIN platform.

All sysfs file names are the same as the current udev-based approach, with the following exception:

• No watchdog sysfs file is created anymore, now that the kernel driver no longer exposes an endpoint. In the config, miscCtrlConfigs is used for watchdogs so that platform_manager doesn't enforce that a device be created in /dev/.
• SC_QSFPDD_IR35223, SC_TH3_ANLG_IR35223, and SC_TH3_CORE_IR35223 devices are added for additional monitoring. These were previously shared but had not been incorporated.
• SCD SPI device is added.

Caveats

1. platform_manager currently reports two failures because it does not read Darwin's EEPROM format correctly; platform_manager support needs to be added for this:

platform_manager[1434]: I1015 00:50:40.059080  1434 PlatformExplorer.cpp:656] Concluding darwin exploration...
platform_manager[1434]: I1015 00:50:40.059091  1434 PlatformExplorer.cpp:660] Unexpected Failures in Device IDPROM for PmUnit RACKMON at SlotPath /RACKMON_SLOT@0
platform_manager[1434]: I1015 00:50:40.059096  1434 PlatformExplorer.cpp:670] 1. Could not fetch contents of IDPROM /sys/bus/i2c/devices/29-0052/eeprom in /RACKMON_SLOT@0. EEPROM version 48 is not supported. Only ver 4+ is supported.
platform_manager[1434]: I1015 00:50:40.059103  1434 PlatformExplorer.cpp:660] Unexpected Failures in Device IDPROM for PmUnit PEM at SlotPath /PEM_SLOT@0
platform_manager[1434]: I1015 00:50:40.059108  1434 PlatformExplorer.cpp:670] 1. Could not fetch contents of IDPROM /sys/bus/i2c/devices/28-0050/eeprom in /PEM_SLOT@0. EEPROM version 48 is not supported. Only ver 4+ is supported.

2. platform_manager fails to read the version and subversion of the CPU_CPLD because the symlink is in /run/devmap/cplds/; this is where the symlink is located in the existing udev rule-based implementation, so the behavior is maintained here.

platform_manager[1434]: E1015 00:50:40.058992  1434 PlatformFsUtils.cpp:128] Received error code 2 from reading from path /run/devmap/cplds/ROOK_CPU_CPLD/cpld_ver: No such file or directory
platform_manager[1434]: E1015 00:50:40.059000  1434 PlatformExplorer.cpp:123] Failed to open firmware version file /run/devmap/cplds/ROOK_CPU_CPLD/cpld_ver: No such file or directory
platform_manager[1434]: E1015 00:50:40.059011  1434 PlatformFsUtils.cpp:128] Received error code 2 from reading from path /run/devmap/cplds/ROOK_CPU_CPLD/cpld_sub_ver: No such file or directory
platform_manager[1434]: E1015 00:50:40.059016  1434 PlatformExplorer.cpp:123] Failed to open firmware version file /run/devmap/cplds/ROOK_CPU_CPLD/cpld_sub_ver: No such file or directory
platform_manager[1434]: I1015 00:50:40.059021  1434 PlatformExplorer.cpp:733] Reporting firmware version for ROOK_CPU_CPLD - version string:0.0 ODS value:0

Test Plan

Tested on Darwin with Linux kernel 6.4 and CentOS 9.

platform_manager service is running:

[root@rkd326 sys]# systemctl status platform_manager
● platform_manager.service - FBOSS Platform Manager
     Loaded: loaded (/etc/systemd/system/platform_manager.service; enabled; preset: disabled)
     Active: active (running) since Tue 2024-10-15 00:50:40 UTC; 25min ago
    Process: 1432 ExecStartPre=/bin/bash -c [[ -f /opt/fboss/share/platform_configs/platform_manager.json ]] (code=exited, status=0/SUCCESS)
   Main PID: 1434 (platform_manage)
      Tasks: 32 (limit: 200901)
     Memory: 4.6M
        CPU: 1.880s
     CGroup: /system.slice/platform_manager.service
             └─1434 /opt/fboss/bin/platform_manager -config-file /opt/fboss/share/platform_configs/platform_manager.json -noenable_pkg_mgmnt --run_once=false -reload_kmods=true

platform_manager loads all devices correctly:

# tree /run/devmap/
/run/devmap/
├── cplds
│   ├── BLACKHAWK_CPLD -> /sys/bus/i2c/devices/9-0023
│   ├── FAN_CPLD -> /sys/bus/i2c/devices/13-0060
│   └── ROOK_CPU_CPLD -> /sys/bus/pci/devices/0000:ff:0b.3
├── eeproms
│   ├── FANSPINNER_EEPROM -> /sys/bus/i2c/devices/29-0050/eeprom
│   └── RACKMON_EEPROM -> /sys/bus/i2c/devices/29-0052/eeprom
├── flashes
│   └── SCD_SPI_MASTER_DEVICE1 -> /dev/spidev2002.0
├── fpgas
│   └── SCD_FPGA -> /sys/bus/pci/devices/0000:07:00.0
├── gpiochips
│   └── RACKMON_PLS -> /dev/gpiochip2
├── i2c-busses
│   ├── ROOK_SMBUS0_CH0 -> /dev/i2c-1
│   ├── ROOK_SMBUS0_CH1 -> /dev/i2c-2
│   ├── ROOK_SMBUS0_CH2 -> /dev/i2c-3
│   ├── ROOK_SMBUS0_CH3 -> /dev/i2c-4
│   ├── ROOK_SMBUS1_CH0 -> /dev/i2c-5
│   ├── ROOK_SMBUS1_CH1 -> /dev/i2c-6
│   ├── ROOK_SMBUS1_CH2 -> /dev/i2c-7
│   ├── ROOK_SMBUS1_CH3 -> /dev/i2c-8
│   ├── ROOK_SMBUS2_CH0 -> /dev/i2c-9
│   ├── ROOK_SMBUS2_CH1 -> /dev/i2c-10
│   ├── ROOK_SMBUS2_CH2 -> /dev/i2c-11
│   ├── ROOK_SMBUS2_CH3 -> /dev/i2c-12
│   ├── ROOK_SMBUS3_CH0 -> /dev/i2c-13
│   ├── ROOK_SMBUS3_CH1 -> /dev/i2c-14
│   ├── ROOK_SMBUS3_CH2 -> /dev/i2c-15
│   ├── ROOK_SMBUS3_CH3 -> /dev/i2c-16
│   ├── SCD_SMBUS0_CH0 -> /dev/i2c-17
│   ├── SCD_SMBUS0_CH1 -> /dev/i2c-18
│   ├── SCD_SMBUS0_CH2 -> /dev/i2c-19
│   ├── SCD_SMBUS0_CH3 -> /dev/i2c-20
│   ├── SCD_SMBUS0_CH4 -> /dev/i2c-21
│   ├── SCD_SMBUS0_CH5 -> /dev/i2c-22
│   ├── SCD_SMBUS0_CH6 -> /dev/i2c-23
│   ├── SCD_SMBUS0_CH7 -> /dev/i2c-24
│   ├── SCD_SMBUS1_CH0 -> /dev/i2c-25
│   ├── SCD_SMBUS1_CH1 -> /dev/i2c-26
│   ├── SCD_SMBUS1_CH2 -> /dev/i2c-27
│   ├── SCD_SMBUS1_CH3 -> /dev/i2c-28
│   ├── SCD_SMBUS1_CH4 -> /dev/i2c-29
│   ├── SCD_SMBUS1_CH5 -> /dev/i2c-30
│   ├── SCD_SMBUS1_CH6 -> /dev/i2c-31
│   └── SCD_SMBUS1_CH7 -> /dev/i2c-32
└── sensors
    ├── CPU_BOARD_TEMP_MAX6658 -> /sys/bus/i2c/devices/1-004c/hwmon/hwmon2
    ├── CPU_CORE_TEMP -> /sys/bus/platform/devices/coretemp.0/hwmon/hwmon1
    ├── CPU_FP_TEMP_LM73 -> /sys/bus/i2c/devices/15-0048/hwmon/hwmon3
    ├── CPU_MPS1_PMBUS -> /sys/bus/i2c/devices/3-0021/hwmon/hwmon5
    ├── CPU_MPS2_PMBUS -> /sys/bus/i2c/devices/3-0027/hwmon/hwmon6
    ├── CPU_POS_UCD90160 -> /sys/bus/i2c/devices/2-004e/hwmon/hwmon4
    ├── FAN_CPLD -> /sys/bus/i2c/devices/13-0060/hwmon/hwmon7
    ├── FS_FAN_SLG4F4527 -> /sys/bus/i2c/devices/29-0008/hwmon/hwmon15
    ├── PCH_THERMAL -> /sys/devices/virtual/thermal/thermal_zone0/hwmon0
    ├── PEM_ADC_MAX11645 -> /sys/bus/i2c/devices/28-0036/iio:device0
    ├── PEM_ECB_MAX5970 -> /sys/bus/i2c/devices/28-003a/hwmon/hwmon13
    ├── PEM_TEMP_MAX6658 -> /sys/bus/i2c/devices/28-004c/hwmon/hwmon14
    ├── SC_BOARD_TEMP_MAX6581 -> /sys/bus/i2c/devices/25-004d/hwmon/hwmon8
    ├── SC_POS_UCD90320 -> /sys/bus/i2c/devices/11-0011/hwmon/hwmon9
    ├── SC_QSFPDD_IR35223 -> /sys/bus/i2c/devices/32-0042/hwmon/hwmon12
    ├── SC_TH3_ANLG_IR35223 -> /sys/bus/i2c/devices/31-0041/hwmon/hwmon11
    └── SC_TH3_CORE_IR35223 -> /sys/bus/i2c/devices/30-0040/hwmon/hwmon10

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