ARM: 7461/1: topology: Add arch_scale_freq_power function
Add infrastructure to be able to modify the cpu_power of each core Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -22,6 +22,37 @@
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#include <asm/cputype.h>
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#include <asm/topology.h>
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/*
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* cpu power scale management
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*/
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/*
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* cpu power table
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* This per cpu data structure describes the relative capacity of each core.
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* On a heteregenous system, cores don't have the same computation capacity
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* and we reflect that difference in the cpu_power field so the scheduler can
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* take this difference into account during load balance. A per cpu structure
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* is preferred because each CPU updates its own cpu_power field during the
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* load balance except for idle cores. One idle core is selected to run the
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* rebalance_domains for all idle cores and the cpu_power can be updated
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* during this sequence.
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*/
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static DEFINE_PER_CPU(unsigned long, cpu_scale);
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unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu)
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{
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return per_cpu(cpu_scale, cpu);
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}
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static void set_power_scale(unsigned int cpu, unsigned long power)
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{
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per_cpu(cpu_scale, cpu) = power;
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}
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/*
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* cpu topology management
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*/
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#define MPIDR_SMP_BITMASK (0x3 << 30)
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#define MPIDR_SMP_VALUE (0x2 << 30)
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@ -41,6 +72,9 @@
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#define MPIDR_LEVEL2_MASK 0xFF
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#define MPIDR_LEVEL2_SHIFT 16
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/*
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* cpu topology table
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*/
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struct cputopo_arm cpu_topology[NR_CPUS];
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const struct cpumask *cpu_coregroup_mask(int cpu)
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@ -134,7 +168,7 @@ void init_cpu_topology(void)
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{
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unsigned int cpu;
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/* init core mask */
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/* init core mask and power*/
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for_each_possible_cpu(cpu) {
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struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
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@ -143,6 +177,8 @@ void init_cpu_topology(void)
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cpu_topo->socket_id = -1;
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cpumask_clear(&cpu_topo->core_sibling);
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cpumask_clear(&cpu_topo->thread_sibling);
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set_power_scale(cpu, SCHED_POWER_SCALE);
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}
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smp_wmb();
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}
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