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,
16 enum {
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,
23 enum {
24 #include <linux/sched/sd_flags.h>
25 };
26 #undef SD_FLAG
27
28 #ifdef CONFIG_SCHED_DEBUG
29
30 struct sd_flag_debug {
31 unsigned int meta_flags;
32 char *name;
33 };
34 extern const struct sd_flag_debug sd_flag_debug[];
35
36 #endif
37
38 #ifdef CONFIG_SCHED_SMT
39 static inline int cpu_smt_flags(void)
40 {
41 return SD_SHARE_CPUCAPACITY | SD_SHARE_LLC;
42 }
43 #endif
44
45 #ifdef CONFIG_SCHED_CLUSTER
46 static inline int cpu_cluster_flags(void)
47 {
48 return SD_CLUSTER | SD_SHARE_LLC;
49 }
50 #endif
51
52 #ifdef CONFIG_SCHED_MC
53 static inline int cpu_core_flags(void)
54 {
55 return SD_SHARE_LLC;
56 }
57 #endif
58
59 #ifdef CONFIG_NUMA
60 static inline int cpu_numa_flags(void)
61 {
62 return SD_NUMA;
63 }
64 #endif
65
66 extern int arch_asym_cpu_priority(int cpu);
67
68 struct 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
76 extern int sched_domain_level_max;
77
78 struct sched_group;
79
80 struct 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
87 struct 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 #ifdef CONFIG_SCHEDSTATS
113 /* sched_balance_rq() stats */
114 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
115 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
116 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
117 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
118 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
119 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
120 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
121 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
122
123 /* Active load balancing */
124 unsigned int alb_count;
125 unsigned int alb_failed;
126 unsigned int alb_pushed;
127
128 /* SD_BALANCE_EXEC stats */
129 unsigned int sbe_count;
130 unsigned int sbe_balanced;
131 unsigned int sbe_pushed;
132
133 /* SD_BALANCE_FORK stats */
134 unsigned int sbf_count;
135 unsigned int sbf_balanced;
136 unsigned int sbf_pushed;
137
138 /* try_to_wake_up() stats */
139 unsigned int ttwu_wake_remote;
140 unsigned int ttwu_move_affine;
141 unsigned int ttwu_move_balance;
142 #endif
143 #ifdef CONFIG_SCHED_DEBUG
144 char *name;
145 #endif
146 union {
147 void *private; /* used during construction */
148 struct rcu_head rcu; /* used during destruction */
149 };
150 struct sched_domain_shared *shared;
151
152 unsigned int span_weight;
153 /*
154 * Span of all CPUs in this domain.
155 *
156 * NOTE: this field is variable length. (Allocated dynamically
157 * by attaching extra space to the end of the structure,
158 * depending on how many CPUs the kernel has booted up with)
159 */
160 unsigned long span[];
161 };
162
163 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
164 {
165 return to_cpumask(sd->span);
166 }
167
168 extern void partition_sched_domains_locked(int ndoms_new,
169 cpumask_var_t doms_new[],
170 struct sched_domain_attr *dattr_new);
171
172 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
173 struct sched_domain_attr *dattr_new);
174
175 /* Allocate an array of sched domains, for partition_sched_domains(). */
176 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
177 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
178
179 bool cpus_equal_capacity(int this_cpu, int that_cpu);
180 bool cpus_share_cache(int this_cpu, int that_cpu);
181 bool cpus_share_resources(int this_cpu, int that_cpu);
182
183 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
184 typedef int (*sched_domain_flags_f)(void);
185
186 #define SDTL_OVERLAP 0x01
187
188 struct 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
195 struct 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
206 extern 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
216 struct sched_domain_attr;
217
218 static inline void
219 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
220 struct sched_domain_attr *dattr_new)
221 {
222 }
223
224 static inline void
225 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
226 struct sched_domain_attr *dattr_new)
227 {
228 }
229
230 static inline bool cpus_equal_capacity(int this_cpu, int that_cpu)
231 {
232 return true;
233 }
234
235 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
236 {
237 return true;
238 }
239
240 static inline bool cpus_share_resources(int this_cpu, int that_cpu)
241 {
242 return true;
243 }
244
245 #endif /* !CONFIG_SMP */
246
247 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
248 extern void rebuild_sched_domains_energy(void);
249 #else
250 static inline void rebuild_sched_domains_energy(void)
251 {
252 }
253 #endif
254
255 #ifndef arch_scale_cpu_capacity
256 /**
257 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
258 * @cpu: the CPU in question.
259 *
260 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
261 *
262 * max_perf(cpu)
263 * ----------------------------- * SCHED_CAPACITY_SCALE
264 * max(max_perf(c) : c \in CPUs)
265 */
266 static __always_inline
267 unsigned long arch_scale_cpu_capacity(int cpu)
268 {
269 return SCHED_CAPACITY_SCALE;
270 }
271 #endif
272
273 #ifndef arch_scale_hw_pressure
274 static __always_inline
275 unsigned long arch_scale_hw_pressure(int cpu)
276 {
277 return 0;
278 }
279 #endif
280
281 #ifndef arch_update_hw_pressure
282 static __always_inline
283 void arch_update_hw_pressure(const struct cpumask *cpus,
284 unsigned long capped_frequency)
285 { }
286 #endif
287
288 #ifndef arch_scale_freq_ref
289 static __always_inline
290 unsigned int arch_scale_freq_ref(int cpu)
291 {
292 return 0;
293 }
294 #endif
295
296 static inline int task_node(const struct task_struct *p)
297 {
298 return cpu_to_node(task_cpu(p));
299 }
300
301 #endif /* _LINUX_SCHED_TOPOLOGY_H */
302
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TOMOYO® is a registered trademark of NTT DATA CORPORATION.