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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SCHED_TOPOLOGY_H
#define _LINUX_SCHED_TOPOLOGY_H
#include <linux/topology.h>
#include <linux/sched/idle.h>
/*
* sched-domains (multiprocessor balancing) declarations:
*/
#ifdef CONFIG_SMP
/* Generate SD flag indexes */
#define SD_FLAG(name, mflags) __##name,
enum {
#include <linux/sched/sd_flags.h>
__SD_FLAG_CNT,
};
#undef SD_FLAG
/* Generate SD flag bits */
#define SD_FLAG(name, mflags) name = 1 << __##name,
enum {
#include <linux/sched/sd_flags.h>
};
#undef SD_FLAG
#ifdef CONFIG_SCHED_DEBUG
struct sd_flag_debug {
unsigned int meta_flags;
char *name;
};
extern const struct sd_flag_debug sd_flag_debug[];
#endif
#ifdef CONFIG_SCHED_SMT
static inline int cpu_smt_flags(void)
{
return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
}
#endif
#ifdef CONFIG_SCHED_MC
static inline int cpu_core_flags(void)
{
return SD_SHARE_PKG_RESOURCES;
}
#endif
#ifdef CONFIG_NUMA
static inline int cpu_numa_flags(void)
{
return SD_NUMA;
}
#endif
extern int arch_asym_cpu_priority(int cpu);
struct sched_domain_attr {
int relax_domain_level;
};
#define SD_ATTR_INIT (struct sched_domain_attr) { \
.relax_domain_level = -1, \
}
extern int sched_domain_level_max;
struct sched_group;
struct sched_domain_shared {
atomic_t ref;
atomic_t nr_busy_cpus;
int has_idle_cores;
int nr_idle_scan;
};
struct sched_domain {
/* These fields must be setup */
struct sched_domain __rcu *parent; /* top domain must be null terminated */
struct sched_domain __rcu *child; /* bottom domain must be null terminated */
struct sched_group *groups; /* the balancing groups of the domain */
unsigned long min_interval; /* Minimum balance interval ms */
unsigned long max_interval; /* Maximum balance interval ms */
unsigned int busy_factor; /* less balancing by factor if busy */
unsigned int imbalance_pct; /* No balance until over watermark */
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
int nohz_idle; /* NOHZ IDLE status */
int flags; /* See SD_* */
int level;
/* Runtime fields. */
unsigned long last_balance; /* init to jiffies. units in jiffies */
unsigned int balance_interval; /* initialise to 1. units in ms. */
unsigned int nr_balance_failed; /* initialise to 0 */
/* idle_balance() stats */
u64 max_newidle_lb_cost;
unsigned long next_decay_max_lb_cost;
u64 avg_scan_cost; /* select_idle_sibling */
#ifdef CONFIG_SCHEDSTATS
/* load_balance() stats */
unsigned int lb_count[CPU_MAX_IDLE_TYPES];
unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
/* Active load balancing */
unsigned int alb_count;
unsigned int alb_failed;
unsigned int alb_pushed;
/* SD_BALANCE_EXEC stats */
unsigned int sbe_count;
unsigned int sbe_balanced;
unsigned int sbe_pushed;
/* SD_BALANCE_FORK stats */
unsigned int sbf_count;
unsigned int sbf_balanced;
unsigned int sbf_pushed;
/* try_to_wake_up() stats */
unsigned int ttwu_wake_remote;
unsigned int ttwu_move_affine;
unsigned int ttwu_move_balance;
#endif
#ifdef CONFIG_SCHED_DEBUG
char *name;
#endif
union {
void *private; /* used during construction */
struct rcu_head rcu; /* used during destruction */
};
struct sched_domain_shared *shared;
unsigned int span_weight;
/*
* Span of all CPUs in this domain.
*
* NOTE: this field is variable length. (Allocated dynamically
* by attaching extra space to the end of the structure,
* depending on how many CPUs the kernel has booted up with)
*/
unsigned long span[];
};
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
return to_cpumask(sd->span);
}
extern void partition_sched_domains_locked(int ndoms_new,
cpumask_var_t doms_new[],
struct sched_domain_attr *dattr_new);
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
struct sched_domain_attr *dattr_new);
/* Allocate an array of sched domains, for partition_sched_domains(). */
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
bool cpus_share_cache(int this_cpu, int that_cpu);
typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
typedef int (*sched_domain_flags_f)(void);
#define SDTL_OVERLAP 0x01
struct sd_data {
struct sched_domain *__percpu *sd;
struct sched_domain_shared *__percpu *sds;
struct sched_group *__percpu *sg;
struct sched_group_capacity *__percpu *sgc;
};
struct sched_domain_topology_level {
sched_domain_mask_f mask;
sched_domain_flags_f sd_flags;
int flags;
int numa_level;
struct sd_data data;
#ifdef CONFIG_SCHED_DEBUG
char *name;
#endif
};
extern void set_sched_topology(struct sched_domain_topology_level *tl);
#ifdef CONFIG_SCHED_DEBUG
# define SD_INIT_NAME(type) .name = #type
#else
# define SD_INIT_NAME(type)
#endif
#else /* CONFIG_SMP */
struct sched_domain_attr;
static inline void
partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
struct sched_domain_attr *dattr_new)
{
}
static inline void
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
struct sched_domain_attr *dattr_new)
{
}
static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
return true;
}
#endif /* !CONFIG_SMP */
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
extern void rebuild_sched_domains_energy(void);
#else
static inline void rebuild_sched_domains_energy(void)
{
}
#endif
#ifndef arch_scale_cpu_capacity
/**
* arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
* @cpu: the CPU in question.
*
* Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
*
* max_perf(cpu)
* ----------------------------- * SCHED_CAPACITY_SCALE
* max(max_perf(c) : c \in CPUs)
*/
static __always_inline
unsigned long arch_scale_cpu_capacity(int cpu)
{
return SCHED_CAPACITY_SCALE;
}
#endif
#ifndef arch_scale_thermal_pressure
static __always_inline
unsigned long arch_scale_thermal_pressure(int cpu)
{
return 0;
}
#endif
#ifndef arch_set_thermal_pressure
static __always_inline
void arch_set_thermal_pressure(const struct cpumask *cpus,
unsigned long th_pressure)
{ }
#endif
static inline int task_node(const struct task_struct *p)
{
return cpu_to_node(task_cpu(p));
}
#endif /* _LINUX_SCHED_TOPOLOGY_H */
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