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cpufreq: intel_pstate: Populate the cpu_capacity sysfs entries

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Intel hybrid processors have CPUs of different capacity. Populate the
interface /sys/devices/system/cpu/cpuN/cpu_capacity.

This interface uses the per-CPU variable `cpu_scale`. On x86 this
variable has no other use besides feeding the sysfs entries. Initialize
it when setting CPU capacity for the scheduler and scale-invariant code.
Feed it with arch_scale_cpu_capacity() as it gives capacity normalized
to the interval [0, SCHED_CAPACITY_SCALE].

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ricardo Neri 2025-04-18 19:55:04 -07:00 committed by Rafael J. Wysocki
parent 6bceea7a1e
commit f1a50492f5
1 changed files with 2 additions and 0 deletions
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2
drivers/cpufreq/intel_pstate.c
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@ -955,6 +955,8 @@ static void hybrid_set_cpu_capacity(struct cpudata *cpu)
cpu->capacity_perf,
cpu->pstate.max_pstate_physical);
topology_set_cpu_scale(cpu->cpu, arch_scale_cpu_capacity(cpu->cpu));
pr_debug("CPU%d: perf = %u, max. perf = %u, base perf = %d\n", cpu->cpu,
cpu->capacity_perf, hybrid_max_perf_cpu->capacity_perf,
cpu->pstate.max_pstate_physical);