include/linux/arch_topology.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/linux/arch_topology.h - arch specific cpu topology information
   4  */
   5 #ifndef _LINUX_ARCH_TOPOLOGY_H_
   6 #define _LINUX_ARCH_TOPOLOGY_H_
   7
   8 #include <linux/types.h>
   9 #include <linux/percpu.h>
  10
  11 void topology_normalize_cpu_scale(void);
  12 int topology_update_cpu_topology(void);
  13
  14 struct device_node;
  15 bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
  16
  17 DECLARE_PER_CPU(unsigned long, cpu_scale);
  18
  19 static inline unsigned long topology_get_cpu_scale(int cpu)
  20 {
  21         return per_cpu(cpu_scale, cpu);
  22 }
  23
  24 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
  25
  26 DECLARE_PER_CPU(unsigned long, arch_freq_scale);
  27
  28 static inline unsigned long topology_get_freq_scale(int cpu)
  29 {
  30         return per_cpu(arch_freq_scale, cpu);
  31 }
  32
  33 void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
  34                              unsigned long max_freq);
  35 bool topology_scale_freq_invariant(void);
  36
  37 enum scale_freq_source {
  38         SCALE_FREQ_SOURCE_CPUFREQ = 0,
  39         SCALE_FREQ_SOURCE_ARCH,
  40 };
  41
  42 struct scale_freq_data {
  43         enum scale_freq_source source;
  44         void (*set_freq_scale)(void);
  45 };
  46
  47 void topology_scale_freq_tick(void);
  48 void topology_set_scale_freq_source(struct scale_freq_data *data, const struct cpumask *cpus);
  49 void topology_clear_scale_freq_source(enum scale_freq_source source, const struct cpumask *cpus);
  50
  51 DECLARE_PER_CPU(unsigned long, thermal_pressure);
  52
  53 static inline unsigned long topology_get_thermal_pressure(int cpu)
  54 {
  55         return per_cpu(thermal_pressure, cpu);
  56 }
  57
  58 void topology_set_thermal_pressure(const struct cpumask *cpus,
  59                                    unsigned long th_pressure);
  60
  61 struct cpu_topology {
  62         int thread_id;
  63         int core_id;
  64         int package_id;
  65         int llc_id;
  66         cpumask_t thread_sibling;
  67         cpumask_t core_sibling;
  68         cpumask_t llc_sibling;
  69 };
  70
  71 #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
  72 extern struct cpu_topology cpu_topology[NR_CPUS];
  73
  74 #define topology_physical_package_id(cpu)       (cpu_topology[cpu].package_id)
  75 #define topology_core_id(cpu)           (cpu_topology[cpu].core_id)
  76 #define topology_core_cpumask(cpu)      (&cpu_topology[cpu].core_sibling)
  77 #define topology_sibling_cpumask(cpu)   (&cpu_topology[cpu].thread_sibling)
  78 #define topology_llc_cpumask(cpu)       (&cpu_topology[cpu].llc_sibling)
  79 void init_cpu_topology(void);
  80 void store_cpu_topology(unsigned int cpuid);
  81 const struct cpumask *cpu_coregroup_mask(int cpu);
  82 void update_siblings_masks(unsigned int cpu);
  83 void remove_cpu_topology(unsigned int cpuid);
  84 void reset_cpu_topology(void);
  85 int parse_acpi_topology(void);
  86 #endif
  87
  88 #endif /* _LINUX_ARCH_TOPOLOGY_H_ */