cpufreq: intel_pstate: Populate the cpu_capacity sysfs entries

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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: ricardon

drivers/cpufreq/intel_pstate.c

@@ -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);