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 struct sched_domain;
  20 static inline
  21 unsigned long topology_get_cpu_scale(int cpu)
  22 {
  23         return per_cpu(cpu_scale, cpu);
  24 }
  25
  26 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
  27
  28 DECLARE_PER_CPU(unsigned long, freq_scale);
  29
  30 static inline
  31 unsigned long topology_get_freq_scale(int cpu)
  32 {
  33         return per_cpu(freq_scale, cpu);
  34 }
  35
  36 struct cpu_topology {
  37         int thread_id;
  38         int core_id;
  39         int package_id;
  40         int llc_id;
  41         cpumask_t thread_sibling;
  42         cpumask_t core_sibling;
  43         cpumask_t llc_sibling;
  44 };
  45
  46 #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
  47 extern struct cpu_topology cpu_topology[NR_CPUS];
  48
  49 #define topology_physical_package_id(cpu)       (cpu_topology[cpu].package_id)
  50 #define topology_core_id(cpu)           (cpu_topology[cpu].core_id)
  51 #define topology_core_cpumask(cpu)      (&cpu_topology[cpu].core_sibling)
  52 #define topology_sibling_cpumask(cpu)   (&cpu_topology[cpu].thread_sibling)
  53 #define topology_llc_cpumask(cpu)       (&cpu_topology[cpu].llc_sibling)
  54 void init_cpu_topology(void);
  55 void store_cpu_topology(unsigned int cpuid);
  56 const struct cpumask *cpu_coregroup_mask(int cpu);
  57 void update_siblings_masks(unsigned int cpu);
  58 void remove_cpu_topology(unsigned int cpuid);
  59 void reset_cpu_topology(void);
  60 #endif
  61
  62 #endif /* _LINUX_ARCH_TOPOLOGY_H_ */