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
topology_get_cpu_scale(int cpu)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
topology_get_freq_scale(int cpu)31 unsigned long topology_get_freq_scale(int cpu)
32 {
33 return per_cpu(freq_scale, cpu);
34 }
35
36 DECLARE_PER_CPU(unsigned long, max_freq_scale);
37
38 static inline
topology_get_max_freq_scale(struct sched_domain * sd,int cpu)39 unsigned long topology_get_max_freq_scale(struct sched_domain *sd, int cpu)
40 {
41 return per_cpu(max_freq_scale, cpu);
42 }
43
44 struct cpu_topology {
45 int thread_id;
46 int core_id;
47 int package_id;
48 int llc_id;
49 cpumask_t thread_sibling;
50 cpumask_t core_sibling;
51 cpumask_t llc_sibling;
52 };
53
54 #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
55 extern struct cpu_topology cpu_topology[NR_CPUS];
56
57 #define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
58 #define topology_core_id(cpu) (cpu_topology[cpu].core_id)
59 #define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
60 #define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
61 #define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling)
62 void init_cpu_topology(void);
63 void store_cpu_topology(unsigned int cpuid);
64 const struct cpumask *cpu_coregroup_mask(int cpu);
65 void update_siblings_masks(unsigned int cpu);
66 void remove_cpu_topology(unsigned int cpuid);
67 void reset_cpu_topology(void);
68 #endif
69
70 #endif /* _LINUX_ARCH_TOPOLOGY_H_ */
71