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_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 u64 avg_scan_cost; /* select_idle_sibling */ 113 114 #ifdef CONFIG_SCHEDSTATS 115 /* load_balance() stats */ 116 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 117 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 118 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 119 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 120 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 121 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 122 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 123 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 124 125 /* Active load balancing */ 126 unsigned int alb_count; 127 unsigned int alb_failed; 128 unsigned int alb_pushed; 129 130 /* SD_BALANCE_EXEC stats */ 131 unsigned int sbe_count; 132 unsigned int sbe_balanced; 133 unsigned int sbe_pushed; 134 135 /* SD_BALANCE_FORK stats */ 136 unsigned int sbf_count; 137 unsigned int sbf_balanced; 138 unsigned int sbf_pushed; 139 140 /* try_to_wake_up() stats */ 141 unsigned int ttwu_wake_remote; 142 unsigned int ttwu_move_affine; 143 unsigned int ttwu_move_balance; 144 #endif 145 #ifdef CONFIG_SCHED_DEBUG 146 char *name; 147 #endif 148 union { 149 void *private; /* used during construction */ 150 struct rcu_head rcu; /* used during destruction */ 151 }; 152 struct sched_domain_shared *shared; 153 154 unsigned int span_weight; 155 /* 156 * Span of all CPUs in this domain. 157 * 158 * NOTE: this field is variable length. (Allocated dynamically 159 * by attaching extra space to the end of the structure, 160 * depending on how many CPUs the kernel has booted up with) 161 */ 162 unsigned long span[]; 163 }; 164 165 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 166 { 167 return to_cpumask(sd->span); 168 } 169 170 extern void partition_sched_domains_locked(int ndoms_new, 171 cpumask_var_t doms_new[], 172 struct sched_domain_attr *dattr_new); 173 174 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 175 struct sched_domain_attr *dattr_new); 176 177 /* Allocate an array of sched domains, for partition_sched_domains(). */ 178 cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 179 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 180 181 bool cpus_share_cache(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 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_share_cache(int this_cpu, int that_cpu) 231 { 232 return true; 233 } 234 235 #endif /* !CONFIG_SMP */ 236 237 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 238 extern void rebuild_sched_domains_energy(void); 239 #else 240 static inline void rebuild_sched_domains_energy(void) 241 { 242 } 243 #endif 244 245 #ifndef arch_scale_cpu_capacity 246 /** 247 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU. 248 * @cpu: the CPU in question. 249 * 250 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. 251 * 252 * max_perf(cpu) 253 * ----------------------------- * SCHED_CAPACITY_SCALE 254 * max(max_perf(c) : c \in CPUs) 255 */ 256 static __always_inline 257 unsigned long arch_scale_cpu_capacity(int cpu) 258 { 259 return SCHED_CAPACITY_SCALE; 260 } 261 #endif 262 263 #ifndef arch_scale_thermal_pressure 264 static __always_inline 265 unsigned long arch_scale_thermal_pressure(int cpu) 266 { 267 return 0; 268 } 269 #endif 270 271 #ifndef arch_update_thermal_pressure 272 static __always_inline 273 void arch_update_thermal_pressure(const struct cpumask *cpus, 274 unsigned long capped_frequency) 275 { } 276 #endif 277 278 static inline int task_node(const struct task_struct *p) 279 { 280 return cpu_to_node(task_cpu(p)); 281 } 282 283 #endif /* _LINUX_SCHED_TOPOLOGY_H */ 284