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9942cb22ea
Create a new method to get a unique and fixed max frequency. Currently
cpuinfo.max_freq or the highest (or last) state of performance domain are
used as the max frequency when computing the frequency for a level of
utilization, but:
- cpuinfo_max_freq can change at runtime. boost is one example of
such change.
- cpuinfo.max_freq and last item of the PD can be different leading to
different results between cpufreq and energy model.
We need to save the reference frequency that has been used when computing
the CPUs capacity and use this fixed and coherent value to convert between
frequency and CPU's capacity.
In fact, we already save the frequency that has been used when computing
the capacity of each CPU. We extend the precision to save kHz instead of
MHz currently and we modify the type to be aligned with other variables
used when converting frequency to capacity and the other way.
[ mingo: Minor edits. ]
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20231211104855.558096-2-vincent.guittot@linaro.org
105 lines
2.9 KiB
C
105 lines
2.9 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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#ifdef CONFIG_ACPI_CPPC_LIB
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void topology_init_cpu_capacity_cppc(void);
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#endif
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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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static inline unsigned long topology_get_cpu_scale(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, capacity_freq_ref);
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static inline unsigned long topology_get_freq_ref(int cpu)
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{
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return per_cpu(capacity_freq_ref, cpu);
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}
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DECLARE_PER_CPU(unsigned long, arch_freq_scale);
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static inline unsigned long topology_get_freq_scale(int cpu)
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{
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return per_cpu(arch_freq_scale, cpu);
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}
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void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
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unsigned long max_freq);
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bool topology_scale_freq_invariant(void);
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enum scale_freq_source {
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SCALE_FREQ_SOURCE_CPUFREQ = 0,
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SCALE_FREQ_SOURCE_ARCH,
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SCALE_FREQ_SOURCE_CPPC,
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};
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struct scale_freq_data {
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enum scale_freq_source source;
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void (*set_freq_scale)(void);
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};
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void topology_scale_freq_tick(void);
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void topology_set_scale_freq_source(struct scale_freq_data *data, const struct cpumask *cpus);
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void topology_clear_scale_freq_source(enum scale_freq_source source, const struct cpumask *cpus);
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DECLARE_PER_CPU(unsigned long, thermal_pressure);
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static inline unsigned long topology_get_thermal_pressure(int cpu)
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{
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return per_cpu(thermal_pressure, cpu);
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}
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void topology_update_thermal_pressure(const struct cpumask *cpus,
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unsigned long capped_freq);
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struct cpu_topology {
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int thread_id;
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int core_id;
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int cluster_id;
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int package_id;
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cpumask_t thread_sibling;
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cpumask_t core_sibling;
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cpumask_t cluster_sibling;
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cpumask_t llc_sibling;
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};
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#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
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extern struct cpu_topology cpu_topology[NR_CPUS];
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
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#define topology_cluster_id(cpu) (cpu_topology[cpu].cluster_id)
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#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
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#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
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#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
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#define topology_cluster_cpumask(cpu) (&cpu_topology[cpu].cluster_sibling)
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#define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling)
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void init_cpu_topology(void);
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void store_cpu_topology(unsigned int cpuid);
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const struct cpumask *cpu_coregroup_mask(int cpu);
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const struct cpumask *cpu_clustergroup_mask(int cpu);
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void update_siblings_masks(unsigned int cpu);
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void remove_cpu_topology(unsigned int cpuid);
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void reset_cpu_topology(void);
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int parse_acpi_topology(void);
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#endif
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#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
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