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>
---
drivers/cpufreq/intel_pstate.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 4aad79d26c64..c32312843f19 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -952,6 +952,8 @@ 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);
--
2.43.0