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 #include <linux/android_kabi.h>
7
8 #include <linux/sched/idle.h>
9
10 /*
11 * sched-domains (multiprocessor balancing) declarations:
12 */
13 #ifdef CONFIG_SMP
14
15 /* Generate SD flag indexes */
16 #define SD_FLAG(name, mflags) __##name,
17 enum {
18 #include <linux/sched/sd_flags.h>
19 __SD_FLAG_CNT,
20 };
21 #undef SD_FLAG
22 /* Generate SD flag bits */
23 #define SD_FLAG(name, mflags) name = 1 << __##name,
24 enum {
25 #include <linux/sched/sd_flags.h>
26 };
27 #undef SD_FLAG
28
29 #ifdef CONFIG_SCHED_DEBUG
30
31 struct sd_flag_debug {
32 unsigned int meta_flags;
33 char *name;
34 };
35 extern const struct sd_flag_debug sd_flag_debug[];
36
37 #endif
38
39 #ifdef CONFIG_SCHED_SMT
cpu_smt_flags(void)40 static inline int cpu_smt_flags(void)
41 {
42 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
43 }
44 #endif
45
46 #ifdef CONFIG_SCHED_CLUSTER
cpu_cluster_flags(void)47 static inline int cpu_cluster_flags(void)
48 {
49 return SD_SHARE_PKG_RESOURCES;
50 }
51 #endif
52
53 #ifdef CONFIG_SCHED_MC
cpu_core_flags(void)54 static inline int cpu_core_flags(void)
55 {
56 return SD_SHARE_PKG_RESOURCES;
57 }
58 #endif
59
60 #ifdef CONFIG_NUMA
cpu_numa_flags(void)61 static inline int cpu_numa_flags(void)
62 {
63 return SD_NUMA;
64 }
65 #endif
66
67 extern int arch_asym_cpu_priority(int cpu);
68
69 struct sched_domain_attr {
70 int relax_domain_level;
71 };
72
73 #define SD_ATTR_INIT (struct sched_domain_attr) { \
74 .relax_domain_level = -1, \
75 }
76
77 extern int sched_domain_level_max;
78
79 struct sched_group;
80
81 struct sched_domain_shared {
82 atomic_t ref;
83 atomic_t nr_busy_cpus;
84 int has_idle_cores;
85 int nr_idle_scan;
86 };
87
88 struct sched_domain {
89 /* These fields must be setup */
90 struct sched_domain __rcu *parent; /* top domain must be null terminated */
91 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
92 struct sched_group *groups; /* the balancing groups of the domain */
93 unsigned long min_interval; /* Minimum balance interval ms */
94 unsigned long max_interval; /* Maximum balance interval ms */
95 unsigned int busy_factor; /* less balancing by factor if busy */
96 unsigned int imbalance_pct; /* No balance until over watermark */
97 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
98 unsigned int imb_numa_nr; /* Nr running tasks that allows a NUMA imbalance */
99
100 int nohz_idle; /* NOHZ IDLE status */
101 int flags; /* See SD_* */
102 int level;
103
104 /* Runtime fields. */
105 unsigned long last_balance; /* init to jiffies. units in jiffies */
106 unsigned int balance_interval; /* initialise to 1. units in ms. */
107 unsigned int nr_balance_failed; /* initialise to 0 */
108
109 /* idle_balance() stats */
110 u64 max_newidle_lb_cost;
111 unsigned long last_decay_max_lb_cost;
112
113 u64 avg_scan_cost; /* select_idle_sibling */
114
115 #ifdef CONFIG_SCHEDSTATS
116 /* load_balance() stats */
117 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
118 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
119 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
120 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
121 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
122 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
123 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
124 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
125
126 /* Active load balancing */
127 unsigned int alb_count;
128 unsigned int alb_failed;
129 unsigned int alb_pushed;
130
131 /* SD_BALANCE_EXEC stats */
132 unsigned int sbe_count;
133 unsigned int sbe_balanced;
134 unsigned int sbe_pushed;
135
136 /* SD_BALANCE_FORK stats */
137 unsigned int sbf_count;
138 unsigned int sbf_balanced;
139 unsigned int sbf_pushed;
140
141 /* try_to_wake_up() stats */
142 unsigned int ttwu_wake_remote;
143 unsigned int ttwu_move_affine;
144 unsigned int ttwu_move_balance;
145 #endif
146 #ifdef CONFIG_SCHED_DEBUG
147 char *name;
148 #endif
149 union {
150 void *private; /* used during construction */
151 struct rcu_head rcu; /* used during destruction */
152 };
153 struct sched_domain_shared *shared;
154
155 unsigned int span_weight;
156
157 ANDROID_KABI_RESERVE(1);
158 ANDROID_KABI_RESERVE(2);
159
160 /*
161 * Span of all CPUs in this domain.
162 *
163 * NOTE: this field is variable length. (Allocated dynamically
164 * by attaching extra space to the end of the structure,
165 * depending on how many CPUs the kernel has booted up with)
166 */
167 unsigned long span[];
168 };
169
sched_domain_span(struct sched_domain * sd)170 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
171 {
172 return to_cpumask(sd->span);
173 }
174
175 extern void partition_sched_domains_locked(int ndoms_new,
176 cpumask_var_t doms_new[],
177 struct sched_domain_attr *dattr_new);
178
179 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
180 struct sched_domain_attr *dattr_new);
181
182 /* Allocate an array of sched domains, for partition_sched_domains(). */
183 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
184 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
185
186 bool cpus_equal_capacity(int this_cpu, int that_cpu);
187 bool cpus_share_cache(int this_cpu, int that_cpu);
188
189 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
190 typedef int (*sched_domain_flags_f)(void);
191
192 #define SDTL_OVERLAP 0x01
193
194 struct sd_data {
195 struct sched_domain *__percpu *sd;
196 struct sched_domain_shared *__percpu *sds;
197 struct sched_group *__percpu *sg;
198 struct sched_group_capacity *__percpu *sgc;
199 };
200
201 struct sched_domain_topology_level {
202 sched_domain_mask_f mask;
203 sched_domain_flags_f sd_flags;
204 int flags;
205 int numa_level;
206 struct sd_data data;
207 #ifdef CONFIG_SCHED_DEBUG
208 char *name;
209 #endif
210 };
211
212 extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
213
214 #ifdef CONFIG_SCHED_DEBUG
215 # define SD_INIT_NAME(type) .name = #type
216 #else
217 # define SD_INIT_NAME(type)
218 #endif
219
220 #else /* CONFIG_SMP */
221
222 struct sched_domain_attr;
223
224 static inline void
partition_sched_domains_locked(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)225 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
226 struct sched_domain_attr *dattr_new)
227 {
228 }
229
230 static inline void
partition_sched_domains(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)231 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
232 struct sched_domain_attr *dattr_new)
233 {
234 }
235
cpus_equal_capacity(int this_cpu,int that_cpu)236 static inline bool cpus_equal_capacity(int this_cpu, int that_cpu)
237 {
238 return true;
239 }
240
cpus_share_cache(int this_cpu,int that_cpu)241 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
242 {
243 return true;
244 }
245
246 #endif /* !CONFIG_SMP */
247
248 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
249 extern void rebuild_sched_domains_energy(void);
250 #else
rebuild_sched_domains_energy(void)251 static inline void rebuild_sched_domains_energy(void)
252 {
253 }
254 #endif
255
256 #ifndef arch_scale_cpu_capacity
257 /**
258 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
259 * @cpu: the CPU in question.
260 *
261 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
262 *
263 * max_perf(cpu)
264 * ----------------------------- * SCHED_CAPACITY_SCALE
265 * max(max_perf(c) : c \in CPUs)
266 */
267 static __always_inline
arch_scale_cpu_capacity(int cpu)268 unsigned long arch_scale_cpu_capacity(int cpu)
269 {
270 return SCHED_CAPACITY_SCALE;
271 }
272 #endif
273
274 #ifndef arch_scale_thermal_pressure
275 static __always_inline
arch_scale_thermal_pressure(int cpu)276 unsigned long arch_scale_thermal_pressure(int cpu)
277 {
278 return 0;
279 }
280 #endif
281
282 #ifndef arch_update_thermal_pressure
283 static __always_inline
arch_update_thermal_pressure(const struct cpumask * cpus,unsigned long capped_frequency)284 void arch_update_thermal_pressure(const struct cpumask *cpus,
285 unsigned long capped_frequency)
286 { }
287 #endif
288
task_node(const struct task_struct * p)289 static inline int task_node(const struct task_struct *p)
290 {
291 return cpu_to_node(task_cpu(p));
292 }
293
294 #endif /* _LINUX_SCHED_TOPOLOGY_H */
295