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Merge branch 'pm-cpufreq'

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* pm-cpufreq:
  cpufreq: intel_pstate: Do not reinit performance limits in ->setpolicy
  cpufreq: intel_pstate: Fix intel_pstate_verify_policy()
  cpufreq: intel_pstate: Fix global settings in active mode
  cpufreq: Add the "cpufreq.off=1" cmdline option
  cpufreq: intel_pstate: Avoid triggering cpu_frequency tracepoint unnecessarily
  cpufreq: intel_pstate: Fix intel_cpufreq_verify_policy()
  cpufreq: intel_pstate: Do not use performance_limits in passive mode
This commit is contained in:
Rafael J. Wysocki 2017-03-09 15:12:27 +01:00
commit fd8e57d5d3
3 changed files with 35 additions and 36 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View file

@ -653,6 +653,9 @@
cpuidle.off=1 [CPU_IDLE]
disable the cpuidle sub-system
cpufreq.off=1 [CPU_FREQ]
disable the cpufreq sub-system
cpu_init_udelay=N
[X86] Delay for N microsec between assert and de-assert
of APIC INIT to start processors. This delay occurs

1
drivers/cpufreq/cpufreq.c
View file

@ -2532,4 +2532,5 @@ static int __init cpufreq_core_init(void)
return 0;
}
module_param(off, int, 0444);
core_initcall(cpufreq_core_init);

67
drivers/cpufreq/intel_pstate.c
View file

@ -377,6 +377,7 @@ static void intel_pstate_set_performance_limits(struct perf_limits *limits)
intel_pstate_init_limits(limits);
limits->min_perf_pct = 100;
limits->min_perf = int_ext_tofp(1);
limits->min_sysfs_pct = 100;
}
static DEFINE_MUTEX(intel_pstate_driver_lock);
@ -968,11 +969,20 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
}
static void intel_pstate_update_policies(void)
__releases(&intel_pstate_limits_lock)
__acquires(&intel_pstate_limits_lock)
{
struct perf_limits *saved_limits = limits;
int cpu;
mutex_unlock(&intel_pstate_limits_lock);
for_each_possible_cpu(cpu)
cpufreq_update_policy(cpu);
mutex_lock(&intel_pstate_limits_lock);
limits = saved_limits;
}
/************************** debugfs begin ************************/
@ -1180,10 +1190,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
limits->no_turbo = clamp_t(int, input, 0, 1);
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_limits_lock);
mutex_unlock(&intel_pstate_driver_lock);
return count;
@ -1217,10 +1227,10 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
limits->max_perf_pct);
limits->max_perf = div_ext_fp(limits->max_perf_pct, 100);
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_limits_lock);
mutex_unlock(&intel_pstate_driver_lock);
return count;
@ -1254,10 +1264,10 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
limits->min_perf_pct);
limits->min_perf = div_ext_fp(limits->min_perf_pct, 100);
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_limits_lock);
mutex_unlock(&intel_pstate_driver_lock);
return count;
@ -1874,13 +1884,11 @@ 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;
@ -1900,6 +1908,8 @@ 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;
@ -2132,16 +2142,11 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
mutex_lock(&intel_pstate_limits_lock);
if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
pr_debug("set performance\n");
if (!perf_limits) {
limits = &performance_limits;
perf_limits = limits;
}
if (policy->max >= policy->cpuinfo.max_freq &&
!limits->no_turbo) {
pr_debug("set performance\n");
intel_pstate_set_performance_limits(perf_limits);
goto out;
}
} else {
pr_debug("set powersave\n");
if (!perf_limits) {
@ -2152,7 +2157,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
}
intel_pstate_update_perf_limits(policy, perf_limits);
out:
if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
/*
* NOHZ_FULL CPUs need this as the governor callback may not
@ -2198,9 +2203,9 @@ static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
unsigned int max_freq, min_freq;
max_freq = policy->cpuinfo.max_freq *
limits->max_sysfs_pct / 100;
perf_limits->max_sysfs_pct / 100;
min_freq = policy->cpuinfo.max_freq *
limits->min_sysfs_pct / 100;
perf_limits->min_sysfs_pct / 100;
cpufreq_verify_within_limits(policy, min_freq, max_freq);
}
@ -2243,13 +2248,8 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
cpu = all_cpu_data[policy->cpu];
/*
* We need sane value in the cpu->perf_limits, so inherit from global
* perf_limits limits, which are seeded with values based on the
* CONFIG_CPU_FREQ_DEFAULT_GOV_*, during boot up.
*/
if (per_cpu_limits)
memcpy(cpu->perf_limits, limits, sizeof(struct perf_limits));
intel_pstate_init_limits(cpu->perf_limits);
policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
@ -2301,7 +2301,6 @@ static struct cpufreq_driver intel_pstate = {
static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
struct perf_limits *perf_limits = limits;
update_turbo_state();
policy->cpuinfo.max_freq = limits->turbo_disabled ?
@ -2309,15 +2308,6 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
cpufreq_verify_within_cpu_limits(policy);
if (per_cpu_limits)
perf_limits = cpu->perf_limits;
mutex_lock(&intel_pstate_limits_lock);
intel_pstate_update_perf_limits(policy, perf_limits);
mutex_unlock(&intel_pstate_limits_lock);
return 0;
}
@ -2370,6 +2360,7 @@ 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;
@ -2383,8 +2374,9 @@ 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)
@ -2437,8 +2429,11 @@ static int intel_pstate_register_driver(void)
intel_pstate_init_limits(&powersave_limits);
intel_pstate_set_performance_limits(&performance_limits);
limits = IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE) ?
&performance_limits : &powersave_limits;
if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE) &&
intel_pstate_driver == &intel_pstate)
limits = &performance_limits;
else
limits = &powersave_limits;
ret = cpufreq_register_driver(intel_pstate_driver);
if (ret) {