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cpufreq: intel_pstate: Add base_frequency attribute
Expose base_frequency to user space via cpufreq sysfs when HWP is in use. This HWP base frequency is read from the ACPI _CPC object if present, or from the HWP Capabilities MSR otherwise. On the majority of the HWP platforms the _CPC object will point to the HWP Capabilities MSR using the "Functional Fixed Hardware" address space type. The address space type also can simply be ACPI_TYPE_INTEGER, however, in which case the platform firmware can set its value at the initialization time based on the system constraints. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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1 changed files with 38 additions and 0 deletions
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@ -373,10 +373,28 @@ static void intel_pstate_set_itmt_prio(int cpu)
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}
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}
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}
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static int intel_pstate_get_cppc_guranteed(int cpu)
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{
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struct cppc_perf_caps cppc_perf;
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int ret;
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ret = cppc_get_perf_caps(cpu, &cppc_perf);
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if (ret)
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return ret;
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return cppc_perf.guaranteed_perf;
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}
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#else
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static void intel_pstate_set_itmt_prio(int cpu)
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{
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}
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static int intel_pstate_get_cppc_guranteed(int cpu)
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{
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return -ENOTSUPP;
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}
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#endif
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static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
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@ -699,9 +717,29 @@ static ssize_t show_energy_performance_preference(
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cpufreq_freq_attr_rw(energy_performance_preference);
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static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
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{
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struct cpudata *cpu;
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u64 cap;
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int ratio;
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ratio = intel_pstate_get_cppc_guranteed(policy->cpu);
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if (ratio <= 0) {
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rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
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ratio = HWP_GUARANTEED_PERF(cap);
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}
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cpu = all_cpu_data[policy->cpu];
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return sprintf(buf, "%d\n", ratio * cpu->pstate.scaling);
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}
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cpufreq_freq_attr_ro(base_frequency);
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static struct freq_attr *hwp_cpufreq_attrs[] = {
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&energy_performance_preference,
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&energy_performance_available_preferences,
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&base_frequency,
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NULL,
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};
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