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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#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
15#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
16#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
17#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
18#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
19#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
20#define SD_ASYM_CPUCAPACITY 0x0040 /* Domain members have different CPU capacities */
21#define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share CPU capacity */
22#define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
23#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share CPU pkg resources */
24#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
25#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
26#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
27#define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
28#define SD_NUMA 0x4000 /* cross-node balancing */
29
30#ifdef CONFIG_SCHED_SMT
31static inline int cpu_smt_flags(void)
32{
33 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
34}
35#endif
36
37#ifdef CONFIG_SCHED_MC
38static inline int cpu_core_flags(void)
39{
40 return SD_SHARE_PKG_RESOURCES;
41}
42#endif
43
44#ifdef CONFIG_NUMA
45static inline int cpu_numa_flags(void)
46{
47 return SD_NUMA;
48}
49#endif
50
51extern int arch_asym_cpu_priority(int cpu);
52
53struct sched_domain_attr {
54 int relax_domain_level;
55};
56
57#define SD_ATTR_INIT (struct sched_domain_attr) { \
58 .relax_domain_level = -1, \
59}
60
61extern int sched_domain_level_max;
62
63struct sched_group;
64
65struct sched_domain_shared {
66 atomic_t ref;
67 atomic_t nr_busy_cpus;
68 int has_idle_cores;
69};
70
71struct sched_domain {
72 /* These fields must be setup */
73 struct sched_domain __rcu *parent; /* top domain must be null terminated */
74 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
75 struct sched_group *groups; /* the balancing groups of the domain */
76 unsigned long min_interval; /* Minimum balance interval ms */
77 unsigned long max_interval; /* Maximum balance interval ms */
78 unsigned int busy_factor; /* less balancing by factor if busy */
79 unsigned int imbalance_pct; /* No balance until over watermark */
80 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
81
82 int nohz_idle; /* NOHZ IDLE status */
83 int flags; /* See SD_* */
84 int level;
85
86 /* Runtime fields. */
87 unsigned long last_balance; /* init to jiffies. units in jiffies */
88 unsigned int balance_interval; /* initialise to 1. units in ms. */
89 unsigned int nr_balance_failed; /* initialise to 0 */
90
91 /* idle_balance() stats */
92 u64 max_newidle_lb_cost;
93 unsigned long next_decay_max_lb_cost;
94
95 u64 avg_scan_cost; /* select_idle_sibling */
96
97#ifdef CONFIG_SCHEDSTATS
98 /* load_balance() stats */
99 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
100 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
101 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
102 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
103 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
104 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
105 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
106 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
107
108 /* Active load balancing */
109 unsigned int alb_count;
110 unsigned int alb_failed;
111 unsigned int alb_pushed;
112
113 /* SD_BALANCE_EXEC stats */
114 unsigned int sbe_count;
115 unsigned int sbe_balanced;
116 unsigned int sbe_pushed;
117
118 /* SD_BALANCE_FORK stats */
119 unsigned int sbf_count;
120 unsigned int sbf_balanced;
121 unsigned int sbf_pushed;
122
123 /* try_to_wake_up() stats */
124 unsigned int ttwu_wake_remote;
125 unsigned int ttwu_move_affine;
126 unsigned int ttwu_move_balance;
127#endif
128#ifdef CONFIG_SCHED_DEBUG
129 char *name;
130#endif
131 union {
132 void *private; /* used during construction */
133 struct rcu_head rcu; /* used during destruction */
134 };
135 struct sched_domain_shared *shared;
136
137 unsigned int span_weight;
138 /*
139 * Span of all CPUs in this domain.
140 *
141 * NOTE: this field is variable length. (Allocated dynamically
142 * by attaching extra space to the end of the structure,
143 * depending on how many CPUs the kernel has booted up with)
144 */
145 unsigned long span[0];
146};
147
148static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
149{
150 return to_cpumask(sd->span);
151}
152
153extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
154 struct sched_domain_attr *dattr_new);
155
156/* Allocate an array of sched domains, for partition_sched_domains(). */
157cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
158void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
159
160bool cpus_share_cache(int this_cpu, int that_cpu);
161
162typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
163typedef int (*sched_domain_flags_f)(void);
164
165#define SDTL_OVERLAP 0x01
166
167struct sd_data {
168 struct sched_domain *__percpu *sd;
169 struct sched_domain_shared *__percpu *sds;
170 struct sched_group *__percpu *sg;
171 struct sched_group_capacity *__percpu *sgc;
172};
173
174struct sched_domain_topology_level {
175 sched_domain_mask_f mask;
176 sched_domain_flags_f sd_flags;
177 int flags;
178 int numa_level;
179 struct sd_data data;
180#ifdef CONFIG_SCHED_DEBUG
181 char *name;
182#endif
183};
184
185extern void set_sched_topology(struct sched_domain_topology_level *tl);
186
187#ifdef CONFIG_SCHED_DEBUG
188# define SD_INIT_NAME(type) .name = #type
189#else
190# define SD_INIT_NAME(type)
191#endif
192
193#else /* CONFIG_SMP */
194
195struct sched_domain_attr;
196
197static inline void
198partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
199 struct sched_domain_attr *dattr_new)
200{
201}
202
203static inline bool cpus_share_cache(int this_cpu, int that_cpu)
204{
205 return true;
206}
207
208#endif /* !CONFIG_SMP */
209
210#ifndef arch_scale_cpu_capacity
211static __always_inline
212unsigned long arch_scale_cpu_capacity(int cpu)
213{
214 return SCHED_CAPACITY_SCALE;
215}
216#endif
217
218static inline int task_node(const struct task_struct *p)
219{
220 return cpu_to_node(task_cpu(p));
221}
222
223#endif /* _LINUX_SCHED_TOPOLOGY_H */