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