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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-04-07 16:21:55 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-04-09 17:16:12 +0200 |
| commit | b989bc0f3cf24122ec700e66eb8ffb93432f18c5 (patch) | |
| tree | 5a67d45e836c9533ea72bdc32c93f7734a457723 /drivers/cpufreq | |
| parent | 60943bbdb42e966aa4d50d587913721b95208fef (diff) | |
| download | linux-b989bc0f3cf24122ec700e66eb8ffb93432f18c5.tar.gz linux-b989bc0f3cf24122ec700e66eb8ffb93432f18c5.tar.xz | |
cpufreq: intel_pstate: Simplify intel_pstate_update_perf_limits()
Because pstate.max_freq is always equal to the product of
pstate.max_pstate and pstate.scaling and, analogously,
pstate.turbo_freq is always equal to the product of
pstate.turbo_pstate and pstate.scaling, the result of the
max_policy_perf computation in intel_pstate_update_perf_limits() is
always equal to the quotient of policy_max and pstate.scaling,
regardless of whether or not turbo is disabled. Analogously, the
result of min_policy_perf in intel_pstate_update_perf_limits() is
always equal to the quotient of policy_min and pstate.scaling.
Accordingly, intel_pstate_update_perf_limits() need not check
whether or not turbo is enabled at all and in order to compute
max_policy_perf and min_policy_perf it can always divide policy_max
and policy_min, respectively, by pstate.scaling. Make it do so.
While at it, move the definition and initialization of the
turbo_max local variable to the code branch using it.
No intentional functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Chen Yu <yu.c.chen@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 22 |
1 files changed, 6 insertions, 16 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2ef9584f4802..f0401064d7aa 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2195,9 +2195,8 @@ static void intel_pstate_update_perf_limits(struct cpudata *cpu, unsigned int policy_min, unsigned int policy_max) { + int scaling = cpu->pstate.scaling; int32_t max_policy_perf, min_policy_perf; - int max_state, turbo_max; - int max_freq; /* * HWP needs some special consideration, because HWP_REQUEST uses @@ -2206,33 +2205,24 @@ static void intel_pstate_update_perf_limits(struct cpudata *cpu, if (hwp_active) intel_pstate_get_hwp_cap(cpu); - if (global.no_turbo || global.turbo_disabled) { - max_state = cpu->pstate.max_pstate; - max_freq = cpu->pstate.max_freq; - } else { - max_state = cpu->pstate.turbo_pstate; - max_freq = cpu->pstate.turbo_freq; - } - - turbo_max = cpu->pstate.turbo_pstate; - - max_policy_perf = max_state * policy_max / max_freq; + max_policy_perf = policy_max / scaling; if (policy_max == policy_min) { min_policy_perf = max_policy_perf; } else { - min_policy_perf = max_state * policy_min / max_freq; + min_policy_perf = policy_min / scaling; min_policy_perf = clamp_t(int32_t, min_policy_perf, 0, max_policy_perf); } - pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n", - cpu->cpu, max_state, min_policy_perf, max_policy_perf); + pr_debug("cpu:%d min_policy_perf:%d max_policy_perf:%d\n", + cpu->cpu, min_policy_perf, max_policy_perf); /* Normalize user input to [min_perf, max_perf] */ if (per_cpu_limits) { cpu->min_perf_ratio = min_policy_perf; cpu->max_perf_ratio = max_policy_perf; } else { + int turbo_max = cpu->pstate.turbo_pstate; int32_t global_min, global_max; /* Global limits are in percent of the maximum turbo P-state. */ |