Add an architecture specific function for setting cpu_power

Signed-off-by: Vincent Guittot vincent.guittot@linaro.org --- arch/arm/kernel/topology.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c index af1c3e6..9d80e22 100644 --- a/arch/arm/kernel/topology.c +++ b/arch/arm/kernel/topology.c @@ -45,12 +45,32 @@ struct cputopo_arm cpu_topology[NR_CPUS];

/* + * cpu power scale management + */ + +/* + * a per cpu data structure should be better because each cpu is mainly + * using its own cpu_power even it's not always true because of + * no_hz_idle_balance + */ +static DEFINE_PER_CPU(unsigned int, cpu_scale); + +/* * cpu topology mask management */

unsigned int advanced_topology = 1;

/* + * Update the cpu power + */ + +unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu) +{ + return per_cpu(cpu_scale, cpu); +} + +/* * default topology function */

@@ -281,6 +301,8 @@ void init_cpu_topology(void) cpu_topo->socket_id = -1; cpumask_clear(&cpu_topo->core_sibling); cpumask_clear(&cpu_topo->thread_sibling); + + per_cpu(cpu_scale, cpu) = SCHED_POWER_SCALE; } smp_wmb(); }