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 #ifdef CONFIG_SCHED_SMT
cpu_smt_flags(void)34 static inline int cpu_smt_flags(void)
35 {
36 return SD_SHARE_CPUCAPACITY | SD_SHARE_LLC;
37 }
38 #endif
39
40 #ifdef CONFIG_SCHED_CLUSTER
cpu_cluster_flags(void)41 static inline int cpu_cluster_flags(void)
42 {
43 return SD_CLUSTER | SD_SHARE_LLC;
44 }
45 #endif
46
47 #ifdef CONFIG_SCHED_MC
cpu_core_flags(void)48 static inline int cpu_core_flags(void)
49 {
50 return SD_SHARE_LLC;
51 }
52 #endif
53
54 #ifdef CONFIG_NUMA
cpu_numa_flags(void)55 static inline int cpu_numa_flags(void)
56 {
57 return SD_NUMA;
58 }
59 #endif
60
61 extern int arch_asym_cpu_priority(int cpu);
62
63 struct 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
71 extern int sched_domain_level_max;
72
73 struct sched_group;
74
75 struct 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
82 struct 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
sched_domain_span(struct sched_domain * sd)159 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
160 {
161 return to_cpumask(sd->span);
162 }
163
164 extern 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(). */
168 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
169 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
170
171 bool cpus_equal_capacity(int this_cpu, int that_cpu);
172 bool cpus_share_cache(int this_cpu, int that_cpu);
173 bool cpus_share_resources(int this_cpu, int that_cpu);
174
175 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
176 typedef int (*sched_domain_flags_f)(void);
177
178 struct 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
185 struct 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
193 extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
194 extern 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)
200 extern void rebuild_sched_domains_energy(void);
201 #else
rebuild_sched_domains_energy(void)202 static 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 */
218 static __always_inline
arch_scale_cpu_capacity(int cpu)219 unsigned long arch_scale_cpu_capacity(int cpu)
220 {
221 return SCHED_CAPACITY_SCALE;
222 }
223 #endif
224
225 #ifndef arch_scale_hw_pressure
226 static __always_inline
arch_scale_hw_pressure(int cpu)227 unsigned long arch_scale_hw_pressure(int cpu)
228 {
229 return 0;
230 }
231 #endif
232
233 #ifndef arch_update_hw_pressure
234 static __always_inline
arch_update_hw_pressure(const struct cpumask * cpus,unsigned long capped_frequency)235 void arch_update_hw_pressure(const struct cpumask *cpus,
236 unsigned long capped_frequency)
237 { }
238 #endif
239
240 #ifndef arch_scale_freq_ref
241 static __always_inline
arch_scale_freq_ref(int cpu)242 unsigned int arch_scale_freq_ref(int cpu)
243 {
244 return 0;
245 }
246 #endif
247
task_node(const struct task_struct * p)248 static 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 */
254