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