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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_SCHED_TOPOLOGY_H
3#define _LINUX_SCHED_TOPOLOGY_H
4
5#include <linux/topology.h>
6
7#include <linux/sched/idle.h>
8
9/*
10 * sched-domains (multiprocessor balancing) declarations:
11 */
12#ifdef CONFIG_SMP
13
14/* Generate SD flag indexes */
15#define SD_FLAG(name, mflags) __##name,
16enum {
17 #include <linux/sched/sd_flags.h>
18 __SD_FLAG_CNT,
19};
20#undef SD_FLAG
21/* Generate SD flag bits */
22#define SD_FLAG(name, mflags) name = 1 << __##name,
23enum {
24 #include <linux/sched/sd_flags.h>
25};
26#undef SD_FLAG
27
28struct sd_flag_debug {
29 unsigned int meta_flags;
30 char *name;
31};
32extern const struct sd_flag_debug sd_flag_debug[];
33
34#ifdef CONFIG_SCHED_SMT
35static inline int cpu_smt_flags(void)
36{
37 return SD_SHARE_CPUCAPACITY | SD_SHARE_LLC;
38}
39#endif
40
41#ifdef CONFIG_SCHED_CLUSTER
42static inline int cpu_cluster_flags(void)
43{
44 return SD_CLUSTER | SD_SHARE_LLC;
45}
46#endif
47
48#ifdef CONFIG_SCHED_MC
49static inline int cpu_core_flags(void)
50{
51 return SD_SHARE_LLC;
52}
53#endif
54
55#ifdef CONFIG_NUMA
56static inline int cpu_numa_flags(void)
57{
58 return SD_NUMA;
59}
60#endif
61
62extern int arch_asym_cpu_priority(int cpu);
63
64struct sched_domain_attr {
65 int relax_domain_level;
66};
67
68#define SD_ATTR_INIT (struct sched_domain_attr) { \
69 .relax_domain_level = -1, \
70}
71
72extern int sched_domain_level_max;
73
74struct sched_group;
75
76struct sched_domain_shared {
77 atomic_t ref;
78 atomic_t nr_busy_cpus;
79 int has_idle_cores;
80 int nr_idle_scan;
81};
82
83struct sched_domain {
84 /* These fields must be setup */
85 struct sched_domain __rcu *parent; /* top domain must be null terminated */
86 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
87 struct sched_group *groups; /* the balancing groups of the domain */
88 unsigned long min_interval; /* Minimum balance interval ms */
89 unsigned long max_interval; /* Maximum balance interval ms */
90 unsigned int busy_factor; /* less balancing by factor if busy */
91 unsigned int imbalance_pct; /* No balance until over watermark */
92 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
93 unsigned int imb_numa_nr; /* Nr running tasks that allows a NUMA imbalance */
94
95 int nohz_idle; /* NOHZ IDLE status */
96 int flags; /* See SD_* */
97 int level;
98
99 /* Runtime fields. */
100 unsigned long last_balance; /* init to jiffies. units in jiffies */
101 unsigned int balance_interval; /* initialise to 1. units in ms. */
102 unsigned int nr_balance_failed; /* initialise to 0 */
103
104 /* idle_balance() stats */
105 u64 max_newidle_lb_cost;
106 unsigned long last_decay_max_lb_cost;
107
108#ifdef CONFIG_SCHEDSTATS
109 /* sched_balance_rq() stats */
110 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
111 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
112 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
113 unsigned int lb_imbalance_load[CPU_MAX_IDLE_TYPES];
114 unsigned int lb_imbalance_util[CPU_MAX_IDLE_TYPES];
115 unsigned int lb_imbalance_task[CPU_MAX_IDLE_TYPES];
116 unsigned int lb_imbalance_misfit[CPU_MAX_IDLE_TYPES];
117 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
118 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
119 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
120 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
121
122 /* Active load balancing */
123 unsigned int alb_count;
124 unsigned int alb_failed;
125 unsigned int alb_pushed;
126
127 /* SD_BALANCE_EXEC stats */
128 unsigned int sbe_count;
129 unsigned int sbe_balanced;
130 unsigned int sbe_pushed;
131
132 /* SD_BALANCE_FORK stats */
133 unsigned int sbf_count;
134 unsigned int sbf_balanced;
135 unsigned int sbf_pushed;
136
137 /* try_to_wake_up() stats */
138 unsigned int ttwu_wake_remote;
139 unsigned int ttwu_move_affine;
140 unsigned int ttwu_move_balance;
141#endif
142 char *name;
143 union {
144 void *private; /* used during construction */
145 struct rcu_head rcu; /* used during destruction */
146 };
147 struct sched_domain_shared *shared;
148
149 unsigned int span_weight;
150 /*
151 * Span of all CPUs in this domain.
152 *
153 * NOTE: this field is variable length. (Allocated dynamically
154 * by attaching extra space to the end of the structure,
155 * depending on how many CPUs the kernel has booted up with)
156 */
157 unsigned long span[];
158};
159
160static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
161{
162 return to_cpumask(sd->span);
163}
164
165extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
166 struct sched_domain_attr *dattr_new);
167
168/* Allocate an array of sched domains, for partition_sched_domains(). */
169cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
170void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
171
172bool cpus_equal_capacity(int this_cpu, int that_cpu);
173bool cpus_share_cache(int this_cpu, int that_cpu);
174bool cpus_share_resources(int this_cpu, int that_cpu);
175
176typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
177typedef int (*sched_domain_flags_f)(void);
178
179#define SDTL_OVERLAP 0x01
180
181struct sd_data {
182 struct sched_domain *__percpu *sd;
183 struct sched_domain_shared *__percpu *sds;
184 struct sched_group *__percpu *sg;
185 struct sched_group_capacity *__percpu *sgc;
186};
187
188struct sched_domain_topology_level {
189 sched_domain_mask_f mask;
190 sched_domain_flags_f sd_flags;
191 int flags;
192 int numa_level;
193 struct sd_data data;
194 char *name;
195};
196
197extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
198
199# define SD_INIT_NAME(type) .name = #type
200
201#else /* CONFIG_SMP */
202
203struct sched_domain_attr;
204
205static inline void
206partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
207 struct sched_domain_attr *dattr_new)
208{
209}
210
211static inline bool cpus_equal_capacity(int this_cpu, int that_cpu)
212{
213 return true;
214}
215
216static inline bool cpus_share_cache(int this_cpu, int that_cpu)
217{
218 return true;
219}
220
221static inline bool cpus_share_resources(int this_cpu, int that_cpu)
222{
223 return true;
224}
225
226#endif /* !CONFIG_SMP */
227
228#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
229extern void rebuild_sched_domains_energy(void);
230#else
231static inline void rebuild_sched_domains_energy(void)
232{
233}
234#endif
235
236#ifndef arch_scale_cpu_capacity
237/**
238 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
239 * @cpu: the CPU in question.
240 *
241 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
242 *
243 * max_perf(cpu)
244 * ----------------------------- * SCHED_CAPACITY_SCALE
245 * max(max_perf(c) : c \in CPUs)
246 */
247static __always_inline
248unsigned long arch_scale_cpu_capacity(int cpu)
249{
250 return SCHED_CAPACITY_SCALE;
251}
252#endif
253
254#ifndef arch_scale_hw_pressure
255static __always_inline
256unsigned long arch_scale_hw_pressure(int cpu)
257{
258 return 0;
259}
260#endif
261
262#ifndef arch_update_hw_pressure
263static __always_inline
264void arch_update_hw_pressure(const struct cpumask *cpus,
265 unsigned long capped_frequency)
266{ }
267#endif
268
269#ifndef arch_scale_freq_ref
270static __always_inline
271unsigned int arch_scale_freq_ref(int cpu)
272{
273 return 0;
274}
275#endif
276
277static inline int task_node(const struct task_struct *p)
278{
279 return cpu_to_node(task_cpu(p));
280}
281
282#endif /* _LINUX_SCHED_TOPOLOGY_H */