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