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cpufreq: intel_pstate: Fix policy data management in passive mode 

The policy->cpuinfo.max_freq and policy->max updates in
intel_cpufreq_turbo_update() are excessive as they are done for no
good reason and may lead to problems in principle, so they should be
dropped.  However, after dropping them intel_cpufreq_turbo_update()
becomes almost entirely pointless, because the check made by it is
made again down the road in intel_pstate_prepare_request().  The
only thing in it that still needs to be done is the call to
update_turbo_state(), so drop intel_cpufreq_turbo_update() altogether
and make its callers invoke update_turbo_state() directly instead of
it.

In addition to that, fix intel_cpufreq_verify_policy() so that it
checks global.no_turbo in addition to global.turbo_disabled when
updating policy->cpuinfo.max_freq to make it consistent with
intel_pstate_verify_policy().

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 2017-03-21 22:19:07 +01:00
parent 7de32556df
commit 64897b20ee
1 changed files with 6 additions and 23 deletions
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29
drivers/cpufreq/intel_pstate.c
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@ -2257,7 +2257,7 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
struct cpudata *cpu = all_cpu_data[policy->cpu];
update_turbo_state();
policy->cpuinfo.max_freq = global.turbo_disabled ?
policy->cpuinfo.max_freq = global.no_turbo || global.turbo_disabled ?
cpu->pstate.max_freq : cpu->pstate.turbo_freq;
cpufreq_verify_within_cpu_limits(policy);
@ -2265,26 +2265,6 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
return 0;
}
static unsigned int intel_cpufreq_turbo_update(struct cpudata *cpu,
struct cpufreq_policy *policy,
unsigned int target_freq)
{
unsigned int max_freq;
update_turbo_state();
max_freq = global.no_turbo || global.turbo_disabled ?
cpu->pstate.max_freq : cpu->pstate.turbo_freq;
policy->cpuinfo.max_freq = max_freq;
if (policy->max > max_freq)
policy->max = max_freq;
if (target_freq > max_freq)
target_freq = max_freq;
return target_freq;
}
static int intel_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
@ -2293,8 +2273,10 @@ static int intel_cpufreq_target(struct cpufreq_policy *policy,
struct cpufreq_freqs freqs;
int target_pstate;
update_turbo_state();
freqs.old = policy->cur;
freqs.new = intel_cpufreq_turbo_update(cpu, policy, target_freq);
freqs.new = target_freq;
cpufreq_freq_transition_begin(policy, &freqs);
switch (relation) {
@ -2326,7 +2308,8 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
struct cpudata *cpu = all_cpu_data[policy->cpu];
int target_pstate;
target_freq = intel_cpufreq_turbo_update(cpu, policy, target_freq);
update_turbo_state();
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);