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 #define SD_BALANCE_NEWIDLE 0x0001 /* Balance when about to become idle */ 15 #define SD_BALANCE_EXEC 0x0002 /* Balance on exec */ 16 #define SD_BALANCE_FORK 0x0004 /* Balance on fork, clone */ 17 #define SD_BALANCE_WAKE 0x0008 /* Balance on wakeup */ 18 #define SD_WAKE_AFFINE 0x0010 /* Wake task to waking CPU */ 19 #define SD_ASYM_CPUCAPACITY 0x0020 /* Domain members have different CPU capacities */ 20 #define SD_SHARE_CPUCAPACITY 0x0040 /* Domain members share CPU capacity */ 21 #define SD_SHARE_POWERDOMAIN 0x0080 /* Domain members share power domain */ 22 #define SD_SHARE_PKG_RESOURCES 0x0100 /* Domain members share CPU pkg resources */ 23 #define SD_SERIALIZE 0x0200 /* Only a single load balancing instance */ 24 #define SD_ASYM_PACKING 0x0400 /* Place busy groups earlier in the domain */ 25 #define SD_PREFER_SIBLING 0x0800 /* Prefer to place tasks in a sibling domain */ 26 #define SD_OVERLAP 0x1000 /* sched_domains of this level overlap */ 27 #define SD_NUMA 0x2000 /* cross-node balancing */ 28 29 #ifdef CONFIG_SCHED_SMT 30 static inline int cpu_smt_flags(void) 31 { 32 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; 33 } 34 #endif 35 36 #ifdef CONFIG_SCHED_MC 37 static inline int cpu_core_flags(void) 38 { 39 return SD_SHARE_PKG_RESOURCES; 40 } 41 #endif 42 43 #ifdef CONFIG_NUMA 44 static inline int cpu_numa_flags(void) 45 { 46 return SD_NUMA; 47 } 48 #endif 49 50 extern int arch_asym_cpu_priority(int cpu); 51 52 struct sched_domain_attr { 53 int relax_domain_level; 54 }; 55 56 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 57 .relax_domain_level = -1, \ 58 } 59 60 extern int sched_domain_level_max; 61 62 struct sched_group; 63 64 struct sched_domain_shared { 65 atomic_t ref; 66 atomic_t nr_busy_cpus; 67 int has_idle_cores; 68 }; 69 70 struct sched_domain { 71 /* These fields must be setup */ 72 struct sched_domain __rcu *parent; /* top domain must be null terminated */ 73 struct sched_domain __rcu *child; /* bottom domain must be null terminated */ 74 struct sched_group *groups; /* the balancing groups of the domain */ 75 unsigned long min_interval; /* Minimum balance interval ms */ 76 unsigned long max_interval; /* Maximum balance interval ms */ 77 unsigned int busy_factor; /* less balancing by factor if busy */ 78 unsigned int imbalance_pct; /* No balance until over watermark */ 79 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 80 81 int nohz_idle; /* NOHZ IDLE status */ 82 int flags; /* See SD_* */ 83 int level; 84 85 /* Runtime fields. */ 86 unsigned long last_balance; /* init to jiffies. units in jiffies */ 87 unsigned int balance_interval; /* initialise to 1. units in ms. */ 88 unsigned int nr_balance_failed; /* initialise to 0 */ 89 90 /* idle_balance() stats */ 91 u64 max_newidle_lb_cost; 92 unsigned long next_decay_max_lb_cost; 93 94 u64 avg_scan_cost; /* select_idle_sibling */ 95 96 #ifdef CONFIG_SCHEDSTATS 97 /* load_balance() stats */ 98 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 99 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 100 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 101 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 102 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 103 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 104 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 105 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 106 107 /* Active load balancing */ 108 unsigned int alb_count; 109 unsigned int alb_failed; 110 unsigned int alb_pushed; 111 112 /* SD_BALANCE_EXEC stats */ 113 unsigned int sbe_count; 114 unsigned int sbe_balanced; 115 unsigned int sbe_pushed; 116 117 /* SD_BALANCE_FORK stats */ 118 unsigned int sbf_count; 119 unsigned int sbf_balanced; 120 unsigned int sbf_pushed; 121 122 /* try_to_wake_up() stats */ 123 unsigned int ttwu_wake_remote; 124 unsigned int ttwu_move_affine; 125 unsigned int ttwu_move_balance; 126 #endif 127 #ifdef CONFIG_SCHED_DEBUG 128 char *name; 129 #endif 130 union { 131 void *private; /* used during construction */ 132 struct rcu_head rcu; /* used during destruction */ 133 }; 134 struct sched_domain_shared *shared; 135 136 unsigned int span_weight; 137 /* 138 * Span of all CPUs in this domain. 139 * 140 * NOTE: this field is variable length. (Allocated dynamically 141 * by attaching extra space to the end of the structure, 142 * depending on how many CPUs the kernel has booted up with) 143 */ 144 unsigned long span[]; 145 }; 146 147 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 148 { 149 return to_cpumask(sd->span); 150 } 151 152 extern void partition_sched_domains_locked(int ndoms_new, 153 cpumask_var_t doms_new[], 154 struct sched_domain_attr *dattr_new); 155 156 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 157 struct sched_domain_attr *dattr_new); 158 159 /* Allocate an array of sched domains, for partition_sched_domains(). */ 160 cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 161 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 162 163 bool cpus_share_cache(int this_cpu, int that_cpu); 164 165 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); 166 typedef int (*sched_domain_flags_f)(void); 167 168 #define SDTL_OVERLAP 0x01 169 170 struct sd_data { 171 struct sched_domain *__percpu *sd; 172 struct sched_domain_shared *__percpu *sds; 173 struct sched_group *__percpu *sg; 174 struct sched_group_capacity *__percpu *sgc; 175 }; 176 177 struct sched_domain_topology_level { 178 sched_domain_mask_f mask; 179 sched_domain_flags_f sd_flags; 180 int flags; 181 int numa_level; 182 struct sd_data data; 183 #ifdef CONFIG_SCHED_DEBUG 184 char *name; 185 #endif 186 }; 187 188 extern void set_sched_topology(struct sched_domain_topology_level *tl); 189 190 #ifdef CONFIG_SCHED_DEBUG 191 # define SD_INIT_NAME(type) .name = #type 192 #else 193 # define SD_INIT_NAME(type) 194 #endif 195 196 #else /* CONFIG_SMP */ 197 198 struct sched_domain_attr; 199 200 static inline void 201 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[], 202 struct sched_domain_attr *dattr_new) 203 { 204 } 205 206 static inline void 207 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 208 struct sched_domain_attr *dattr_new) 209 { 210 } 211 212 static inline bool cpus_share_cache(int this_cpu, int that_cpu) 213 { 214 return true; 215 } 216 217 #endif /* !CONFIG_SMP */ 218 219 #ifndef arch_scale_cpu_capacity 220 /** 221 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU. 222 * @cpu: the CPU in question. 223 * 224 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. 225 * 226 * max_perf(cpu) 227 * ----------------------------- * SCHED_CAPACITY_SCALE 228 * max(max_perf(c) : c \in CPUs) 229 */ 230 static __always_inline 231 unsigned long arch_scale_cpu_capacity(int cpu) 232 { 233 return SCHED_CAPACITY_SCALE; 234 } 235 #endif 236 237 #ifndef arch_scale_thermal_pressure 238 static __always_inline 239 unsigned long arch_scale_thermal_pressure(int cpu) 240 { 241 return 0; 242 } 243 #endif 244 245 #ifndef arch_set_thermal_pressure 246 static __always_inline 247 void arch_set_thermal_pressure(const struct cpumask *cpus, 248 unsigned long th_pressure) 249 { } 250 #endif 251 252 static inline int task_node(const struct task_struct *p) 253 { 254 return cpu_to_node(task_cpu(p)); 255 } 256 257 #endif /* _LINUX_SCHED_TOPOLOGY_H */ 258