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
11void topology_normalize_cpu_scale(void);
12int topology_update_cpu_topology(void);
13
14struct device_node;
15bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
16
17
18DECLARE_PER_CPU(unsigned long, capacity_freq_ref);
19
20static inline unsigned long topology_get_freq_ref(int cpu)
21{
22 return per_cpu(capacity_freq_ref, cpu);
23}
24
25DECLARE_PER_CPU(unsigned long, arch_freq_scale);
26
27static inline unsigned long topology_get_freq_scale(int cpu)
28{
29 return per_cpu(arch_freq_scale, cpu);
30}
31
32void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
33 unsigned long max_freq);
34bool topology_scale_freq_invariant(void);
35
36enum scale_freq_source {
37 SCALE_FREQ_SOURCE_CPUFREQ = 0,
38 SCALE_FREQ_SOURCE_ARCH,
39 SCALE_FREQ_SOURCE_CPPC,
40 SCALE_FREQ_SOURCE_VIRT,
41};
42
43struct scale_freq_data {
44 enum scale_freq_source source;
45 void (*set_freq_scale)(void);
46};
47
48void topology_scale_freq_tick(void);
49void topology_set_scale_freq_source(struct scale_freq_data *data, const struct cpumask *cpus);
50void topology_clear_scale_freq_source(enum scale_freq_source source, const struct cpumask *cpus);
51
52DECLARE_PER_CPU(unsigned long, hw_pressure);
53
54static inline unsigned long topology_get_hw_pressure(int cpu)
55{
56 return per_cpu(hw_pressure, cpu);
57}
58
59void topology_update_hw_pressure(const struct cpumask *cpus,
60 unsigned long capped_freq);
61
62struct cpu_topology {
63 int thread_id;
64 int core_id;
65 int cluster_id;
66 int package_id;
67 cpumask_t thread_sibling;
68 cpumask_t core_sibling;
69 cpumask_t cluster_sibling;
70 cpumask_t llc_sibling;
71};
72
73#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
74extern struct cpu_topology cpu_topology[NR_CPUS];
75
76#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
77#define topology_cluster_id(cpu) (cpu_topology[cpu].cluster_id)
78#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
79#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
80#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
81#define topology_cluster_cpumask(cpu) (&cpu_topology[cpu].cluster_sibling)
82#define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling)
83
84#ifndef arch_cpu_is_threaded
85#define arch_cpu_is_threaded() (0)
86#endif
87
88void init_cpu_topology(void);
89void store_cpu_topology(unsigned int cpuid);
90const struct cpumask *cpu_coregroup_mask(int cpu);
91const struct cpumask *cpu_clustergroup_mask(int cpu);
92void update_siblings_masks(unsigned int cpu);
93void remove_cpu_topology(unsigned int cpuid);
94void reset_cpu_topology(void);
95int parse_acpi_topology(void);
96void freq_inv_set_max_ratio(int cpu, u64 max_rate);
97
98/*
99 * Architectures like ARM64 don't have reliable architectural way to get SMT
100 * information and depend on the firmware (ACPI/OF) report. Non-SMT core won't
101 * initialize thread_id so we can use this to detect the SMT implementation.
102 */
103static inline bool topology_core_has_smt(int cpu)
104{
105 return cpu_topology[cpu].thread_id != -1;
106}
107
108#else
109
110static inline bool topology_core_has_smt(int cpu) { return false; }
111
112#endif /* CONFIG_GENERIC_ARCH_TOPOLOGY */
113
114#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
115

source code of linux/include/linux/arch_topology.h