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cpufreq: intel_pstate: Avoid triggering cpu_frequency tracepoint unnecessarily 

In the passive mode the cpu_frequency trace event is already
triggered by the cpufreq core or by scaling governors, so
intel_pstate should not trigger it once again for the same
P-state updates.

In addition to that, the frequency returned by
intel_cpufreq_fast_switch() and passed via freqs.new from
intel_cpufreq_target() to cpufreq_freq_transition_end() should
reflect the P-state actually set, so make that happen.

Fixes: 001c76f05b (cpufreq: intel_pstate: Generic governors support)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2017-03-03 23:51:31 +01:00
parent 7f17326fc0
commit 6407829901
1 changed files with 5 additions and 3 deletions
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8
drivers/cpufreq/intel_pstate.c
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@ -1879,13 +1879,11 @@ static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
pstate = clamp_t(int, pstate, min_perf, max_perf);
trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
return pstate;
}
static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
{
pstate = intel_pstate_prepare_request(cpu, pstate);
if (pstate == cpu->pstate.current_pstate)
return;
@ -1905,6 +1903,8 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
update_turbo_state();
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
intel_pstate_update_pstate(cpu, target_pstate);
sample = &cpu->sample;
@ -2365,6 +2365,7 @@ static int intel_cpufreq_target(struct cpufreq_policy *policy,
wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL,
pstate_funcs.get_val(cpu, target_pstate));
}
freqs.new = target_pstate * cpu->pstate.scaling;
cpufreq_freq_transition_end(policy, &freqs, false);
return 0;
@ -2378,8 +2379,9 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
target_freq = intel_cpufreq_turbo_update(cpu, policy, target_freq);
target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
intel_pstate_update_pstate(cpu, target_pstate);
return target_freq;
return target_pstate * cpu->pstate.scaling;
}
static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)