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 <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 25830e5d76e894dc85667bc849d5a9644369dc51..531abd63769613a69bf2da84dce2b6559dcd425b 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/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);