/* 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

#define SD_BALANCE_NEWIDLE      0x0001  /* Balance when about to become idle */
#define SD_BALANCE_EXEC         0x0002  /* Balance on exec */
#define SD_BALANCE_FORK         0x0004  /* Balance on fork, clone */
#define SD_BALANCE_WAKE         0x0008  /* Balance on wakeup */
#define SD_WAKE_AFFINE          0x0010  /* Wake task to waking CPU */
#define SD_ASYM_CPUCAPACITY     0x0020  /* Domain members have different CPU capacities */
#define SD_SHARE_CPUCAPACITY    0x0040  /* Domain members share CPU capacity */
#define SD_SHARE_POWERDOMAIN    0x0080  /* Domain members share power domain */
#define SD_SHARE_PKG_RESOURCES  0x0100  /* Domain members share CPU pkg resources */
#define SD_SERIALIZE            0x0200  /* Only a single load balancing instance */
#define SD_ASYM_PACKING         0x0400  /* Place busy groups earlier in the domain */
#define SD_PREFER_SIBLING       0x0800  /* Prefer to place tasks in a sibling domain */
#define SD_OVERLAP              0x1000  /* sched_domains of this level overlap */
#define SD_NUMA                 0x2000  /* cross-node balancing */

#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;
};

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 */

#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 */