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