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tools/power turbostat: decode Baytrail CC6 and MC6 demotion configuration

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with --debug, see:

cpu0: MSR_CC6_DEMOTION_POLICY_CONFIG: 0x00000000 (DISable-CC6-Demotion)
cpu0: MSR_MC6_DEMOTION_POLICY_CONFIG: 0x00000000 (DISable-MC6-Demotion)

Note that the hardware default is to enable demotion,
and Linux started clearing these registers in 3.17.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2017-01-07 22:37:48 -05:00
parent cf4cbe5314
commit 71616c8e93
1 changed files with 42 additions and 0 deletions
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42
tools/power/x86/turbostat/turbostat.c
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@ -3262,6 +3262,27 @@ int has_snb_msrs(unsigned int family, unsigned int model)
return 0;
}
/*
* SLV client has supporet for unique MSRs:
*
* MSR_CC6_DEMOTION_POLICY_CONFIG
* MSR_MC6_DEMOTION_POLICY_CONFIG
*/
int has_slv_msrs(unsigned int family, unsigned int model)
{
if (!genuine_intel)
return 0;
switch (model) {
case INTEL_FAM6_ATOM_SILVERMONT1:
case INTEL_FAM6_ATOM_MERRIFIELD:
case INTEL_FAM6_ATOM_MOOREFIELD:
return 1;
}
return 0;
}
/*
* HSW adds support for additional MSRs:
*
@ -3496,6 +3517,24 @@ void decode_misc_pwr_mgmt_msr(void)
msr & (1 << 1) ? "EN" : "DIS",
msr & (1 << 8) ? "EN" : "DIS");
}
/*
* Decode MSR_CC6_DEMOTION_POLICY_CONFIG, MSR_MC6_DEMOTION_POLICY_CONFIG
*
* This MSRs are present on Silvermont processors,
* Intel Atom processor E3000 series (Baytrail), and friends.
*/
void decode_c6_demotion_policy_msr(void)
{
unsigned long long msr;
if (!get_msr(base_cpu, MSR_CC6_DEMOTION_POLICY_CONFIG, &msr))
fprintf(outf, "cpu%d: MSR_CC6_DEMOTION_POLICY_CONFIG: 0x%08llx (%sable-CC6-Demotion)\n",
base_cpu, msr, msr & (1 << 0) ? "EN" : "DIS");
if (!get_msr(base_cpu, MSR_MC6_DEMOTION_POLICY_CONFIG, &msr))
fprintf(outf, "cpu%d: MSR_MC6_DEMOTION_POLICY_CONFIG: 0x%08llx (%sable-MC6-Demotion)\n",
base_cpu, msr, msr & (1 << 0) ? "EN" : "DIS");
}
void process_cpuid()
{
@ -3700,6 +3739,9 @@ void process_cpuid()
if (debug)
decode_misc_pwr_mgmt_msr();
if (debug && has_slv_msrs(family, model))
decode_c6_demotion_policy_msr();
rapl_probe(family, model);
perf_limit_reasons_probe(family, model);