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_CLUSTER
cpu_cluster_flags(void)46 static inline int cpu_cluster_flags(void)
47 {
48 return SD_SHARE_PKG_RESOURCES;
49 }
50 #endif
51
52 #ifdef CONFIG_SCHED_MC
cpu_core_flags(void)53 static inline int cpu_core_flags(void)
54 {
55 return SD_SHARE_PKG_RESOURCES;
56 }
57 #endif
58
59 #ifdef CONFIG_NUMA
cpu_numa_flags(void)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 };
85
86 struct sched_domain {
87 /* These fields must be setup */
88 struct sched_domain __rcu *parent; /* top domain must be null terminated */
89 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
90 struct sched_group *groups; /* the balancing groups of the domain */
91 unsigned long min_interval; /* Minimum balance interval ms */
92 unsigned long max_interval; /* Maximum balance interval ms */
93 unsigned int busy_factor; /* less balancing by factor if busy */
94 unsigned int imbalance_pct; /* No balance until over watermark */
95 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
96
97 int nohz_idle; /* NOHZ IDLE status */
98 int flags; /* See SD_* */
99 int level;
100
101 /* Runtime fields. */
102 unsigned long last_balance; /* init to jiffies. units in jiffies */
103 unsigned int balance_interval; /* initialise to 1. units in ms. */
104 unsigned int nr_balance_failed; /* initialise to 0 */
105
106 /* idle_balance() stats */
107 u64 max_newidle_lb_cost;
108 unsigned long last_decay_max_lb_cost;
109
110 u64 avg_scan_cost; /* select_idle_sibling */
111
112 #ifdef CONFIG_SCHEDSTATS
113 /* load_balance() 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
sched_domain_span(struct sched_domain * sd)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_share_cache(int this_cpu, int that_cpu);
180
181 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
182 typedef int (*sched_domain_flags_f)(void);
183
184 #define SDTL_OVERLAP 0x01
185
186 struct sd_data {
187 struct sched_domain *__percpu *sd;
188 struct sched_domain_shared *__percpu *sds;
189 struct sched_group *__percpu *sg;
190 struct sched_group_capacity *__percpu *sgc;
191 };
192
193 struct sched_domain_topology_level {
194 sched_domain_mask_f mask;
195 sched_domain_flags_f sd_flags;
196 int flags;
197 int numa_level;
198 struct sd_data data;
199 #ifdef CONFIG_SCHED_DEBUG
200 char *name;
201 #endif
202 };
203
204 extern void set_sched_topology(struct sched_domain_topology_level *tl);
205
206 #ifdef CONFIG_SCHED_DEBUG
207 # define SD_INIT_NAME(type) .name = #type
208 #else
209 # define SD_INIT_NAME(type)
210 #endif
211
212 #else /* CONFIG_SMP */
213
214 struct sched_domain_attr;
215
216 static inline void
partition_sched_domains_locked(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)217 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
218 struct sched_domain_attr *dattr_new)
219 {
220 }
221
222 static inline void
partition_sched_domains(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)223 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
224 struct sched_domain_attr *dattr_new)
225 {
226 }
227
cpus_share_cache(int this_cpu,int that_cpu)228 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
229 {
230 return true;
231 }
232
233 #endif /* !CONFIG_SMP */
234
235 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
236 extern void rebuild_sched_domains_energy(void);
237 #else
rebuild_sched_domains_energy(void)238 static inline void rebuild_sched_domains_energy(void)
239 {
240 }
241 #endif
242
243 #ifndef arch_scale_cpu_capacity
244 /**
245 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
246 * @cpu: the CPU in question.
247 *
248 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
249 *
250 * max_perf(cpu)
251 * ----------------------------- * SCHED_CAPACITY_SCALE
252 * max(max_perf(c) : c \in CPUs)
253 */
254 static __always_inline
arch_scale_cpu_capacity(int cpu)255 unsigned long arch_scale_cpu_capacity(int cpu)
256 {
257 return SCHED_CAPACITY_SCALE;
258 }
259 #endif
260
261 #ifndef arch_scale_thermal_pressure
262 static __always_inline
arch_scale_thermal_pressure(int cpu)263 unsigned long arch_scale_thermal_pressure(int cpu)
264 {
265 return 0;
266 }
267 #endif
268
269 #ifndef arch_set_thermal_pressure
270 static __always_inline
arch_set_thermal_pressure(const struct cpumask * cpus,unsigned long th_pressure)271 void arch_set_thermal_pressure(const struct cpumask *cpus,
272 unsigned long th_pressure)
273 { }
274 #endif
275
task_node(const struct task_struct * p)276 static inline int task_node(const struct task_struct *p)
277 {
278 return cpu_to_node(task_cpu(p));
279 }
280
281 #endif /* _LINUX_SCHED_TOPOLOGY_H */
282