Hi David,

I found a laptop with AMD Ryzen 5 APU and gave it a try, before this
patch turbostat will terminate with return code 243:

Welcome to Ubuntu Impish Indri (development branch) (GNU/Linux 
5.11.0-16-generic x86_64)
$ sudo turbostat 
turbostat version 20.09.30 - Len Brown <l...@kernel.org>
CPUID(0): AuthenticAMD 0x10 CPUID levels; 0x80000020 xlevels; 
family:model:stepping 0x17:60:1 (23:96:1)
CPUID(1): SSE3 MONITOR - - - TSC MSR - HT -
CPUID(6): APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, 
No-HWPepp, No-HWPpkg, No-EPB
CPUID(7): No-SGX
RAPL: 234 sec. Joule Counter Range, at 280 Watts
/dev/cpu_dma_latency: 2000000000 usec (default)
current_driver: acpi_idle
current_governor: menu
current_governor_ro: menu
cpu4: POLL: CPUIDLE CORE POLL IDLE
cpu4: C1: ACPI FFH MWAIT 0x0
cpu4: C2: ACPI IOPORT 0x414
cpu4: C3: ACPI IOPORT 0x415
cpu4: cpufreq driver: acpi-cpufreq
cpu4: cpufreq governor: schedutil
cpufreq boost: 1
cpu0: MSR_RAPL_PWR_UNIT: 0x000a1003 (0.125000 Watts, 0.000015 Joules, 0.000977 
sec.)
$ echo $?
243

After installing debs from 
https://people.canonical.com/~phlin/kernel/lp-1928183-turbostat-cezanne/ and 
reboot to 5.11.0-18, the turbostat command seems to be working (not terminate 
early with 243):
$ sudo turbostat 
turbostat version 20.09.30 - Len Brown <l...@kernel.org>
CPUID(0): AuthenticAMD 0x10 CPUID levels; 0x80000020 xlevels; 
family:model:stepping 0x17:60:1 (23:96:1)
CPUID(1): SSE3 MONITOR - - - TSC MSR - HT -
CPUID(6): APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, 
No-HWPepp, No-HWPpkg, No-EPB
CPUID(7): No-SGX
RAPL: 234 sec. Joule Counter Range, at 280 Watts
/dev/cpu_dma_latency: 2000000000 usec (default)
current_driver: acpi_idle
current_governor: menu
current_governor_ro: menu
cpu4: POLL: CPUIDLE CORE POLL IDLE
cpu4: C1: ACPI FFH MWAIT 0x0
cpu4: C2: ACPI IOPORT 0x414
cpu4: C3: ACPI IOPORT 0x415
cpu4: cpufreq driver: acpi-cpufreq
cpu4: cpufreq governor: schedutil
cpufreq boost: 1
cpu0: MSR_RAPL_PWR_UNIT: 0x000a1003 (0.125000 Watts, 0.000015 Joules, 0.000977 
sec.)
Core    CPU     Avg_MHz Busy%   Bzy_MHz TSC_MHz IRQ     POLL    C1      C2      
C3      POLL%   C1%     C2%     C3%     CorWatt PkgWatt
-       -       2       0.08    1920    3716    542     22      67      0       
457     0.00    0.06    0.00    99.81   0.01    3.66
0       0       2       0.10    1873    3717    50      0       3       0       
48      0.00    0.04    0.00    99.84   0.00    3.66
0       1       0       0.03    1860    3717    15      0       0       0       
15      0.00    0.00    0.00    99.93
1       2       1       0.04    2759    3717    28      0       2       0       
26      0.00    0.01    0.00    99.91   0.00
1       3       0       0.02    2636    3717    12      1       1       0       
10      0.00    0.01    0.00    99.93
2       4       1       0.02    3079    3717    22      1       6       0       
15      0.00    0.01    0.00    99.92   0.00
2       5       1       0.04    2790    3717    30      0       13      0       
20      0.00    0.37    0.00    99.55
4       6       2       0.14    1738    3717    74      4       12      0       
60      0.00    0.07    0.00    99.79   0.00
4       7       2       0.10    1747    3717    48      4       9       0       
35      0.02    0.05    0.00    99.82
5       8       1       0.04    2305    3717    19      0       0       0       
19      0.00    0.00    0.00    99.93   0.00
5       9       2       0.09    1876    3717    46      3       5       0       
38      0.00    0.04    0.00    99.84
6       10      2       0.09    2114    3717    50      4       7       0       
39      0.02    0.07    0.00    99.81   0.00
6       11      5       0.31    1657    3717    148     5       9       0       
132     0.01    0.08    0.00    99.65

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https://bugs.launchpad.net/bugs/1928183

Title:
  turbostat doesn't work with AMD Cezanne APUs

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