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_PKG_RESOURCES; 42 } 43 #endif 44 45 #ifdef CONFIG_SCHED_CLUSTER 46 static inline int cpu_cluster_flags(void) 47 { 48 return SD_CLUSTER | SD_SHARE_PKG_RESOURCES; 49 } 50 #endif 51 52 #ifdef CONFIG_SCHED_MC 53 static inline int cpu_core_flags(void) 54 { 55 return SD_SHARE_PKG_RESOURCES; 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 /* 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 }; 162 163 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 bool cpus_share_resources(int this_cpu, int that_cpu); 181 182 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); 183 typedef int (*sched_domain_flags_f)(void); 184 185 #define SDTL_OVERLAP 0x01 186 187 struct sd_data { 188 struct sched_domain *__percpu *sd; 189 struct sched_domain_shared *__percpu *sds; 190 struct sched_group *__percpu *sg; 191 struct sched_group_capacity *__percpu *sgc; 192 }; 193 194 struct sched_domain_topology_level { 195 sched_domain_mask_f mask; 196 sched_domain_flags_f sd_flags; 197 int flags; 198 int numa_level; 199 struct sd_data data; 200 #ifdef CONFIG_SCHED_DEBUG 201 char *name; 202 #endif 203 }; 204 205 extern void __init set_sched_topology(struct sched_domain_topology_level *tl); 206 207 #ifdef CONFIG_SCHED_DEBUG 208 # define SD_INIT_NAME(type) .name = #type 209 #else 210 # define SD_INIT_NAME(type) 211 #endif 212 213 #else /* CONFIG_SMP */ 214 215 struct sched_domain_attr; 216 217 static inline void 218 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[], 219 struct sched_domain_attr *dattr_new) 220 { 221 } 222 223 static inline void 224 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 225 struct sched_domain_attr *dattr_new) 226 { 227 } 228 229 static inline bool cpus_share_cache(int this_cpu, int that_cpu) 230 { 231 return true; 232 } 233 234 static inline bool cpus_share_resources(int this_cpu, int that_cpu) 235 { 236 return true; 237 } 238 239 #endif /* !CONFIG_SMP */ 240 241 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 242 extern void rebuild_sched_domains_energy(void); 243 #else 244 static inline void rebuild_sched_domains_energy(void) 245 { 246 } 247 #endif 248 249 #ifndef arch_scale_cpu_capacity 250 /** 251 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU. 252 * @cpu: the CPU in question. 253 * 254 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. 255 * 256 * max_perf(cpu) 257 * ----------------------------- * SCHED_CAPACITY_SCALE 258 * max(max_perf(c) : c \in CPUs) 259 */ 260 static __always_inline 261 unsigned long arch_scale_cpu_capacity(int cpu) 262 { 263 return SCHED_CAPACITY_SCALE; 264 } 265 #endif 266 267 #ifndef arch_scale_thermal_pressure 268 static __always_inline 269 unsigned long arch_scale_thermal_pressure(int cpu) 270 { 271 return 0; 272 } 273 #endif 274 275 #ifndef arch_update_thermal_pressure 276 static __always_inline 277 void arch_update_thermal_pressure(const struct cpumask *cpus, 278 unsigned long capped_frequency) 279 { } 280 #endif 281 282 #ifndef arch_scale_freq_ref 283 static __always_inline 284 unsigned int arch_scale_freq_ref(int cpu) 285 { 286 return 0; 287 } 288 #endif 289 290 static inline int task_node(const struct task_struct *p) 291 { 292 return cpu_to_node(task_cpu(p)); 293 } 294 295 #endif /* _LINUX_SCHED_TOPOLOGY_H */ 296