Re: [Regression] 6.11.0-rc1: AMD CPU boot with error when CPPC feature disabled by BIOS

[David Wang]

Hi,

At 2024-07-31 18:12:12, "Gautham R.Shenoy" <gautham.shenoy@xxxxxxx> wrote:
>Hello David,
>
>David Wang <00107082@xxxxxxx> writes:
>
>> Hi,
>>
>> I notice some kernel warning and errors when I update to 6.11.0-rc1:
>>
>>  kernel: [    1.022739] amd_pstate: The CPPC feature is supported but currently disabled by the BIOS.
>>  kernel: [    1.022739] Please enable it if your BIOS has the CPPC option.
>>  kernel: [    1.098054] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.110058] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.122057] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.134062] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.134641] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.135128] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.135693] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.136371] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>>  kernel: [    1.136390] amd_pstate: failed to register with return -19
>>  kernel: [    1.138410] ledtrig-cpu: registered to indicate activity on CPUs
>>
>>
>> Those warning message was introduced by commit:
>>  bff7d13c190ad98cf4f877189b022c75df4cb383 ("cpufreq: amd-pstate: add debug message while CPPC is supported and disabled by SBIOS)
>> , which make sense.
>
>
>If CPPC is disabed in the BIOS, then the _CPC objects shouldn't have
>been created. And the error message that you should have seen is
>"the _CPC object is not present in SBIOS or ACPI disabled".
>
>
>Could you please share the family and model number of the platform where
>you are observing this ?

My `cat /proc/cpuinfo` shows something as following:
processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 23
model		: 113
model name	: AMD Ryzen 3 3100 4-Core Processor
stepping	: 0
microcode	: 0x8701021
cpu MHz		: 3600.000
cache size	: 512 KB
physical id	: 0
siblings	: 8
core id		: 0
cpu cores	: 4
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 16
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sev sev_es
bugs		: sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb srso
bogomips	: 7199.95
TLB size	: 3072 4K pages
clflush size	: 64
cache_alignment	: 64
address sizes	: 43 bits physical, 48 bits virtual
power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]




>
>--
>Thanks and Regards
>gautham.