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