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_MC 46 static inline int cpu_core_flags(void) 47 { 48 return SD_SHARE_PKG_RESOURCES; 49 } 50 #endif 51 52 #ifdef CONFIG_NUMA 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 }; 155 156 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 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 216 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 217 struct sched_domain_attr *dattr_new) 218 { 219 } 220 221 static inline bool cpus_share_cache(int this_cpu, int that_cpu) 222 { 223 return true; 224 } 225 226 #endif /* !CONFIG_SMP */ 227 228 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 229 extern void rebuild_sched_domains_energy(void); 230 #else 231 static inline void rebuild_sched_domains_energy(void) 232 { 233 } 234 #endif 235 236 #ifndef arch_scale_cpu_capacity 237 /** 238 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU. 239 * @cpu: the CPU in question. 240 * 241 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. 242 * 243 * max_perf(cpu) 244 * ----------------------------- * SCHED_CAPACITY_SCALE 245 * max(max_perf(c) : c \in CPUs) 246 */ 247 static __always_inline 248 unsigned long arch_scale_cpu_capacity(int cpu) 249 { 250 return SCHED_CAPACITY_SCALE; 251 } 252 #endif 253 254 #ifndef arch_scale_thermal_pressure 255 static __always_inline 256 unsigned long arch_scale_thermal_pressure(int cpu) 257 { 258 return 0; 259 } 260 #endif 261 262 #ifndef arch_set_thermal_pressure 263 static __always_inline 264 void arch_set_thermal_pressure(const struct cpumask *cpus, 265 unsigned long th_pressure) 266 { } 267 #endif 268 269 static inline int task_node(const struct task_struct *p) 270 { 271 return cpu_to_node(task_cpu(p)); 272 } 273 274 #endif /* _LINUX_SCHED_TOPOLOGY_H */ 275