[Bug 281962] amdsmn(4), amdtemp(4): add support for AMD Family 19h Models 40h-4Fh

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281962

            Bug ID: 281962
           Summary: amdsmn(4), amdtemp(4): add support for AMD Family 19h
                    Models 40h-4Fh
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@lanter-it.ch

Created attachment 254112
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=254112&action=edit
Patch for amdsmn.c and amdtemp.c to support AMD Ryzen 7 "Rembrandt"

The attached patch adds support for AMD Ryzen 7 "Rembrandt" processors (family
0x19, model 0x40-0x4f) to the amdsmn(4) and amdtemp(4) drivers, enabling
temperature readings of these CPUs via sysctl. The sensors work the same as for
the "Raphael" processors (model 0x60-0x6f), only the PCI device ID differs.

The patch applies cleanly to (15-) current, 14-stable, including 14.1-RELEASE.
It should also work with 13, as only the PCI device ID is changed.

Tested with Ryzen 7 PRO 6850U (family 0x19, model 0x44,
https://bsd-hardware.info/?probe=0a2c02f944).

Kernel messages:
CPU: AMD Ryzen 7 PRO 6850U with Radeon Graphics      (2695.04-MHz K8-class CPU)
  Origin="AuthenticAMD"  Id=0xa40f41  Family=0x19  Model=0x44  Stepping=1
[...]
amdsmn0: <AMD Family 19h System Management Network> on hostb0
amdtemp0: <AMD CPU On-Die Thermal Sensors> on hostb0

$ sysctl dev.amdtemp
dev.amdtemp.0.core0.sensor0: 48.5C
dev.amdtemp.0.sensor_offset: 0
dev.amdtemp.0.%parent: hostb0
dev.amdtemp.0.%pnpinfo: 
dev.amdtemp.0.%location: 
dev.amdtemp.0.%driver: amdtemp
dev.amdtemp.0.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.%parent: 

$ sysctl dev.cpu.0
dev.cpu.0.temperature: 48.5C
dev.cpu.0.cx_method: C1/hlt C2/io C3/io
dev.cpu.0.cx_usage_counters: 49971 0 0
dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 42529us
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_supported: C1/1/1 C2/2/18 C3/3/350
dev.cpu.0.freq_levels: 2700/3240 1800/1980 1600/1600
dev.cpu.0.freq: 1600
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=ACPI0007 _UID=0 _CID=none
dev.cpu.0.%location: handle=\_SB_.PLTF.C000
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU

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