c4ed8aa44d
Implements the Max Frequency Capping Engine (MFCE) getter function topology_get_max_freq_scale() to provide the scheduler with a maximum frequency scaling correction factor for more accurate cpu capacity handling by being able to deal with max frequency capping. This scaling factor describes the influence of running a cpu with a current maximum frequency (policy) lower than the maximum possible frequency (cpuinfo). The factor is: policy_max_freq(cpu) << SCHED_CAPACITY_SHIFT / cpuinfo_max_freq(cpu) It also implements the MFCE setter function arch_set_max_freq_scale() which is called from cpufreq_set_policy(). Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> [Trivial cherry-pick issue in cpufreq.c] Signed-off-by: Quentin Perret <quentin.perret@arm.com> Change-Id: I59e52861ee260755ab0518fe1f7183a2e4e3d0fc
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/arch_topology.h - arch specific cpu topology information
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*/
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#ifndef _LINUX_ARCH_TOPOLOGY_H_
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#define _LINUX_ARCH_TOPOLOGY_H_
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#include <linux/types.h>
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#include <linux/percpu.h>
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void topology_normalize_cpu_scale(void);
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int topology_update_cpu_topology(void);
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struct device_node;
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bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
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DECLARE_PER_CPU(unsigned long, cpu_scale);
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struct sched_domain;
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static inline
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unsigned long topology_get_cpu_scale(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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void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
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DECLARE_PER_CPU(unsigned long, freq_scale);
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static inline
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unsigned long topology_get_freq_scale(int cpu)
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{
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return per_cpu(freq_scale, cpu);
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}
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DECLARE_PER_CPU(unsigned long, max_freq_scale);
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static inline
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unsigned long topology_get_max_freq_scale(struct sched_domain *sd, int cpu)
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{
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return per_cpu(max_freq_scale, cpu);
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}
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#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
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