xref: /device/soc/rockchip/common/sdk_linux/kernel/sched/sched.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Scheduler internal types and methods:
 */
#ifndef COMMON_SDK_LINUX_KERNEL_SCHED_SCHED_H
#define COMMON_SDK_LINUX_KERNEL_SCHED_SCHED_H

#include <linux/sched.h>
#include <linux/sched/autogroup.h>
#include <linux/sched/clock.h>
#include <linux/sched/coredump.h>
#include <linux/sched/cpufreq.h>
#include <linux/sched/cputime.h>
#include <linux/sched/deadline.h>
#include <linux/sched/debug.h>
#include <linux/sched/hotplug.h>
#include <linux/sched/idle.h>
#include <linux/sched/init.h>
#include <linux/sched/isolation.h>
#include <linux/sched/jobctl.h>
#include <linux/sched/loadavg.h>
#include <linux/sched/mm.h>
#include <linux/sched/nohz.h>
#include <linux/sched/numa_balancing.h>
#include <linux/sched/prio.h>
#include <linux/sched/rt.h>
#include <linux/sched/signal.h>
#include <linux/sched/smt.h>
#include <linux/sched/stat.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/sched/topology.h>
#include <linux/sched/user.h>
#include <linux/sched/wake_q.h>
#include <linux/sched/xacct.h>

#include <uapi/linux/sched/types.h>

#include <linux/binfmts.h>
#include <linux/blkdev.h>
#include <linux/compat.h>
#include <linux/context_tracking.h>
#include <linux/cpufreq.h>
#include <linux/cpuidle.h>
#include <linux/cpuset.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/delayacct.h>
#include <linux/energy_model.h>
#include <linux/init_task.h>
#include <linux/kprobes.h>
#include <linux/kthread.h>
#include <linux/membarrier.h>
#include <linux/migrate.h>
#include <linux/mmu_context.h>
#include <linux/nmi.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/profile.h>
#include <linux/psi.h>
#include <linux/rcupdate_wait.h>
#include <linux/security.h>
#include <linux/stop_machine.h>
#include <linux/suspend.h>
#include <linux/swait.h>
#include <linux/syscalls.h>
#include <linux/task_work.h>
#include <linux/tsacct_kern.h>

#include <asm/tlb.h>
#include <asm-generic/vmlinux.lds.h>

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#endif

#include "cpupri.h"
#include "cpudeadline.h"

#include <trace/events/sched.h>

#ifdef CONFIG_SCHED_DEBUG
#define SCHED_WARN_ON(x) (WARN_ONCE(x, #x))
#else
#define SCHED_WARN_ON(x) ( {               \
    (void)(x), 0; })
#endif

struct rq;
struct cpuidle_state;

#ifdef CONFIG_SCHED_RT_CAS
extern unsigned long uclamp_task_util(struct task_struct *p);
#endif

#ifdef CONFIG_SCHED_WALT
extern unsigned int sched_ravg_window;
extern unsigned int walt_cpu_util_freq_divisor;

struct walt_sched_stats {
    u64 cumulative_runnable_avg_scaled;
};

struct load_subtractions {
    u64 window_start;
    u64 subs;
    u64 new_subs;
};

#define NUM_TRACKED_WINDOWS 2

struct sched_cluster {
    raw_spinlock_t load_lock;
    struct list_head list;
    struct cpumask cpus;
    int id;
    int max_power_cost;
    int min_power_cost;
    int max_possible_capacity;
    int capacity;
    int efficiency; /* Differentiate cpus with different IPC capability */
    int load_scale_factor;
    unsigned int exec_scale_factor;
    /*
     * max_freq = user maximum
     * max_possible_freq = maximum supported by hardware
     */
    unsigned int cur_freq, max_freq, min_freq;
    unsigned int max_possible_freq;
    bool freq_init_done;
};

extern unsigned int sched_disable_window_stats;
#endif /* CONFIG_SCHED_WALT */

/* task_struct::on_rq states: */
#define TASK_ON_RQ_QUEUED 1
#define TASK_ON_RQ_MIGRATING 2

extern __read_mostly int scheduler_running;

extern unsigned long calc_load_update;
extern atomic_long_t calc_load_tasks;

extern const u64 max_cfs_quota_period;

extern void calc_global_load_tick(struct rq *this_rq);
extern long calc_load_fold_active(struct rq *this_rq, long adjust);

#ifdef CONFIG_SMP
extern void init_sched_groups_capacity(int cpu, struct sched_domain *sd);
#endif

extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
/*
 * Helpers for converting nanosecond timing to jiffy resolution
 */
#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
#ifdef CONFIG_SCHED_LATENCY_NICE
#define MAX_LATENCY_NICE	19
#define MIN_LATENCY_NICE	-20
#define LATENCY_NICE_WIDTH	\
    (MAX_LATENCY_NICE - MIN_LATENCY_NICE + 1)
#define DEFAULT_LATENCY_NICE	0
#define DEFAULT_LATENCY_PRIO	(DEFAULT_LATENCY_NICE + LATENCY_NICE_WIDTH/2)
#define NICE_TO_LATENCY(nice)	((nice) + DEFAULT_LATENCY_PRIO)
#define LATENCY_TO_NICE(prio)	((prio) - DEFAULT_LATENCY_PRIO)
#define NICE_LATENCY_SHIFT	(SCHED_FIXEDPOINT_SHIFT)
#define NICE_LATENCY_WEIGHT_MAX	(1L << NICE_LATENCY_SHIFT)
#endif /* CONFIG_SCHED_LATENCY_NICE */

/*
 * Increase resolution of nice-level calculations for 64-bit architectures.
 * The extra resolution improves shares distribution and load balancing of
 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
 * hierarchies, especially on larger systems. This is not a user-visible change
 * and does not change the user-interface for setting shares/weights.
 *
 * We increase resolution only if we have enough bits to allow this increased
 * resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit
 * are pretty high and the returns do not justify the increased costs.
 *
 * Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to
 * increase coverage and consistency always enable it on 64-bit platforms.
 */
#ifdef CONFIG_64BIT
#define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
#define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
#define scale_load_down(w)                                                                                             \
    ( {                                                                                                                \
        unsigned long __w = (w);                                                                                       \
        if (__w)                                                                                                       \
            __w = max(2UL, __w >> SCHED_FIXEDPOINT_SHIFT);                                                             \
        __w;                                                                                                           \
    })
#else
#define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
#define scale_load(w) (w)
#define scale_load_down(w) (w)
#endif

/*
 * Task weight (visible to users) and its load (invisible to users) have
 * independent resolution, but they should be well calibrated. We use
 * scale_load() and scale_load_down(w) to convert between them. The
 * following must be true:
 *
 *  scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD
 *
 */
#define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
#define CPU_FREQ_1K 1024
#define CPU_SAMPLE_ARTE 8

extern struct cpufreq_governor schedutil_gov;

/*
 * Single value that decides SCHED_DEADLINE internal math precision.
 * 10 -> just above 1us
 * 9  -> just above 0.5us
 */
#define DL_SCALE 10

/*
 * Single value that denotes runtime == period, ie unlimited time.
 */
#define RUNTIME_INF ((u64)~0ULL)

static inline int idle_policy(int policy)
{
    return policy == SCHED_IDLE;
}
static inline int fair_policy(int policy)
{
    return policy == SCHED_NORMAL || policy == SCHED_BATCH;
}

static inline int rt_policy(int policy)
{
    return policy == SCHED_FIFO || policy == SCHED_RR;
}

static inline int dl_policy(int policy)
{
    return policy == SCHED_DEADLINE;
}
static inline bool valid_policy(int policy)
{
    return idle_policy(policy) || fair_policy(policy) || rt_policy(policy) || dl_policy(policy);
}

static inline int task_has_idle_policy(struct task_struct *p)
{
    return idle_policy(p->policy);
}

static inline int task_has_rt_policy(struct task_struct *p)
{
    return rt_policy(p->policy);
}

static inline int task_has_dl_policy(struct task_struct *p)
{
    return dl_policy(p->policy);
}

#define cap_scale(v, s) (((v) * (s)) >> SCHED_CAPACITY_SHIFT)

static inline void update_avg(u64 *avg, u64 sample)
{
    s64 diff = sample - *avg;
    *avg += diff / CPU_SAMPLE_ARTE;
}

/*
 * Shifting a value by an exponent greater *or equal* to the size of said value
 * is UB; cap at size-1.
 */
#define shr_bound(val, shift) ((val) >> min_t(typeof(shift), (shift), BITS_PER_TYPE(typeof(val)) - 1))

/*
 * !! For sched_setattr_nocheck() (kernel) only !!
 *
 * This is actually gross. :(
 *
 * It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE
 * tasks, but still be able to sleep. We need this on platforms that cannot
 * atomically change clock frequency. Remove once fast switching will be
 * available on such platforms.
 *
 * SUGOV stands for SchedUtil GOVernor.
 */
#define SCHED_FLAG_SUGOV 0x10000000

#define SCHED_DL_FLAGS (SCHED_FLAG_RECLAIM | SCHED_FLAG_DL_OVERRUN | SCHED_FLAG_SUGOV)

static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se)
{
#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
    return unlikely(dl_se->flags & SCHED_FLAG_SUGOV);
#else
    return false;
#endif
}

/*
 * Tells if entity @a should preempt entity @b.
 */
static inline bool dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b)
{
    return dl_entity_is_special(a) || dl_time_before(a->deadline, b->deadline);
}

/*
 * This is the priority-queue data structure of the RT scheduling class:
 */
struct rt_prio_array {
    DECLARE_BITMAP(bitmap, MAX_RT_PRIO + 1); /* include 1 bit for delimiter */
    struct list_head queue[MAX_RT_PRIO];
};

struct rt_bandwidth {
    /* nests inside the rq lock: */
    raw_spinlock_t rt_runtime_lock;
    ktime_t rt_period;
    u64 rt_runtime;
    struct hrtimer rt_period_timer;
    unsigned int rt_period_active;
};

void __dl_clear_params(struct task_struct *p);

struct dl_bandwidth {
    raw_spinlock_t dl_runtime_lock;
    u64 dl_runtime;
    u64 dl_period;
};

static inline int dl_bandwidth_enabled(void)
{
    return sysctl_sched_rt_runtime >= 0;
}

/*
 * To keep the bandwidth of -deadline tasks under control
 * we need some place where:
 *  - store the maximum -deadline bandwidth of each cpu;
 *  - cache the fraction of bandwidth that is currently allocated in
 *    each root domain;
 *
 * This is all done in the data structure below. It is similar to the
 * one used for RT-throttling (rt_bandwidth), with the main difference
 * that, since here we are only interested in admission control, we
 * do not decrease any runtime while the group "executes", neither we
 * need a timer to replenish it.
 *
 * With respect to SMP, bandwidth is given on a per root domain basis,
 * meaning that:
 *  - bw (< 100%) is the deadline bandwidth of each CPU;
 *  - total_bw is the currently allocated bandwidth in each root domain;
 */
struct dl_bw {
    raw_spinlock_t lock;
    u64 bw;
    u64 total_bw;
};

static inline void __dl_update(struct dl_bw *dl_b, s64 bw);

static inline void __dl_sub(struct dl_bw *dl_b, u64 tsk_bw, int cpus)
{
    dl_b->total_bw -= tsk_bw;
    __dl_update(dl_b, (s32)tsk_bw / cpus);
}

static inline void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus)
{
    dl_b->total_bw += tsk_bw;
    __dl_update(dl_b, -((s32)tsk_bw / cpus));
}

static inline bool __dl_overflow(struct dl_bw *dl_b, unsigned long cap, u64 old_bw, u64 new_bw)
{
    return (dl_b->bw != -1) && (cap_scale(dl_b->bw, cap) < (dl_b->total_bw - old_bw + new_bw));
}

/*
 * Verify the fitness of task @p to run on @cpu taking into account the
 * CPU original capacity and the runtime/deadline ratio of the task.
 *
 * The function will return true if the CPU original capacity of the
 * @cpu scaled by SCHED_CAPACITY_SCALE >= runtime/deadline ratio of the
 * task and false otherwise.
 */
static inline bool dl_task_fits_capacity(struct task_struct *p, int cpu)
{
    unsigned long cap = arch_scale_cpu_capacity(cpu);

    return ((cap_scale(p->dl.dl_deadline, cap)) >= (p->dl.dl_runtime));
}

extern void init_dl_bw(struct dl_bw *dl_b);
extern int sched_dl_global_validate(void);
extern void sched_dl_do_global(void);
extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr);
extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr);
extern bool __checkparam_dl(const struct sched_attr *attr);
extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
extern int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed);
extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
extern int  dl_cpu_busy(int cpu, struct task_struct *p);

#ifdef CONFIG_CGROUP_SCHED

#include <linux/cgroup.h>
#include <linux/psi.h>

struct cfs_rq;
struct rt_rq;

extern struct list_head task_groups;

struct cfs_bandwidth {
#ifdef CONFIG_CFS_BANDWIDTH
    raw_spinlock_t lock;
    ktime_t period;
    u64 quota;
    u64 runtime;
    s64 hierarchical_quota;

    u8 idle;
    u8 period_active;
    u8 slack_started;
    struct hrtimer period_timer;
    struct hrtimer slack_timer;
    struct list_head throttled_cfs_rq;

    /* Statistics: */
    int nr_periods;
    int nr_throttled;
    u64 throttled_time;
#endif
};

/* Task group related information */
struct task_group {
    struct cgroup_subsys_state css;

#ifdef CONFIG_FAIR_GROUP_SCHED
    /* schedulable entities of this group on each CPU */
    struct sched_entity **se;
    /* runqueue "owned" by this group on each CPU */
    struct cfs_rq **cfs_rq;
    unsigned long shares;

#ifdef CONFIG_SMP
    /*
     * load_avg can be heavily contended at clock tick time, so put
     * it in its own cacheline separated from the fields above which
     * will also be accessed at each tick.
     */
    atomic_long_t load_avg ____cacheline_aligned;
#endif
#endif

#ifdef CONFIG_RT_GROUP_SCHED
    struct sched_rt_entity **rt_se;
    struct rt_rq **rt_rq;

    struct rt_bandwidth rt_bandwidth;
#endif

    struct rcu_head rcu;
    struct list_head list;

    struct task_group *parent;
    struct list_head siblings;
    struct list_head children;

#ifdef CONFIG_SCHED_AUTOGROUP
    struct autogroup *autogroup;
#endif

    struct cfs_bandwidth cfs_bandwidth;

#ifdef CONFIG_UCLAMP_TASK_GROUP
    /* The two decimal precision [%] value requested from user-space */
    unsigned int uclamp_pct[UCLAMP_CNT];
    /* Clamp values requested for a task group */
    struct uclamp_se uclamp_req[UCLAMP_CNT];
    /* Effective clamp values used for a task group */
    struct uclamp_se uclamp[UCLAMP_CNT];
#endif

#ifdef CONFIG_SCHED_RTG_CGROUP
    /*
     * Controls whether tasks of this cgroup should be colocated with each
     * other and tasks of other cgroups that have the same flag turned on.
     */
    bool colocate;

    /* Controls whether further updates are allowed to the colocate flag */
    bool colocate_update_disabled;
#endif
};

#ifdef CONFIG_FAIR_GROUP_SCHED
#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD

/*
 * A weight of 0 or 1 can cause arithmetics problems.
 * A weight of a cfs_rq is the sum of weights of which entities
 * are queued on this cfs_rq, so a weight of a entity should not be
 * too large, so as the shares value of a task group.
 * (The default weight is 1024 - so there's no practical
 *  limitation from this.)
 */
#define MIN_SHARES (1UL << 1)
#define MAX_SHARES (1UL << 18)
#endif

typedef int (*tg_visitor)(struct task_group *, void *);

extern int walk_tg_tree_from(struct task_group *from, tg_visitor down, tg_visitor up, void *data);

/*
 * Iterate the full tree, calling @down when first entering a node and @up when
 * leaving it for the final time.
 *
 * Caller must hold rcu_lock or sufficient equivalent.
 */
static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
{
    return walk_tg_tree_from(&root_task_group, down, up, data);
}

extern int tg_nop(struct task_group *tg, void *data);

extern void free_fair_sched_group(struct task_group *tg);
extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
extern void online_fair_sched_group(struct task_group *tg);
extern void unregister_fair_sched_group(struct task_group *tg);
extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, struct sched_entity *se, int cpu,
                              struct sched_entity *parent);
extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b);

extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);

extern void free_rt_sched_group(struct task_group *tg);
extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, int cpu,
                             struct sched_rt_entity *parent);
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
extern long sched_group_rt_runtime(struct task_group *tg);
extern long sched_group_rt_period(struct task_group *tg);
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);

extern struct task_group *sched_create_group(struct task_group *parent);
extern void sched_online_group(struct task_group *tg, struct task_group *parent);
extern void sched_destroy_group(struct task_group *tg);
extern void sched_offline_group(struct task_group *tg);

extern void sched_move_task(struct task_struct *tsk);

#ifdef CONFIG_FAIR_GROUP_SCHED
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);

#ifdef CONFIG_SMP
extern void set_task_rq_fair(struct sched_entity *se, struct cfs_rq *prev, struct cfs_rq *next);
#else  /* !CONFIG_SMP */
static inline void set_task_rq_fair(struct sched_entity *se, struct cfs_rq *prev, struct cfs_rq *next)
{
}
#endif /* CONFIG_SMP */
#endif /* CONFIG_FAIR_GROUP_SCHED */

#else /* CONFIG_CGROUP_SCHED */

struct cfs_bandwidth {
};

#endif /* CONFIG_CGROUP_SCHED */

/* CFS-related fields in a runqueue */
struct cfs_rq {
    struct load_weight load;
    unsigned int nr_running;
    unsigned int h_nr_running;      /* SCHED_{NORMAL,BATCH,IDLE} */
    unsigned int idle_h_nr_running; /* SCHED_IDLE */

    u64 exec_clock;
    u64 min_vruntime;
#ifndef CONFIG_64BIT
    u64 min_vruntime_copy;
#endif

    struct rb_root_cached tasks_timeline;

    /*
     * 'curr' points to currently running entity on this cfs_rq.
     * It is set to NULL otherwise (i.e when none are currently running).
     */
    struct sched_entity *curr;
    struct sched_entity *next;
    struct sched_entity *last;
    struct sched_entity *skip;

#ifdef CONFIG_SCHED_DEBUG
    unsigned int nr_spread_over;
#endif

#ifdef CONFIG_SMP
    /*
     * CFS load tracking
     */
    struct sched_avg avg;
#ifndef CONFIG_64BIT
    u64 load_last_update_time_copy;
#endif
    struct {
        raw_spinlock_t lock ____cacheline_aligned;
        int nr;
        unsigned long load_avg;
        unsigned long util_avg;
        unsigned long runnable_avg;
    } removed;

#ifdef CONFIG_FAIR_GROUP_SCHED
    unsigned long tg_load_avg_contrib;
    long propagate;
    long prop_runnable_sum;

    /*
     *   h_load = weight * f(tg)
     *
     * Where f(tg) is the recursive weight fraction assigned to
     * this group.
     */
    unsigned long h_load;
    u64 last_h_load_update;
    struct sched_entity *h_load_next;
#endif /* CONFIG_FAIR_GROUP_SCHED */
#endif /* CONFIG_SMP */

#ifdef CONFIG_FAIR_GROUP_SCHED
    struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */

    /*
     * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
     * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
     * (like users, containers etc.)
     *
     * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU.
     * This list is used during load balance.
     */
    int on_list;
    struct list_head leaf_cfs_rq_list;
    struct task_group *tg; /* group that "owns" this runqueue */

#ifdef CONFIG_SCHED_WALT
    struct walt_sched_stats walt_stats;
#endif

#ifdef CONFIG_CFS_BANDWIDTH
    int runtime_enabled;
    s64 runtime_remaining;

    u64 throttled_clock;
    u64 throttled_clock_pelt;
    u64 throttled_clock_pelt_time;
    int throttled;
    int throttle_count;
    struct list_head throttled_list;
#ifdef CONFIG_SCHED_WALT
    u64 cumulative_runnable_avg;
#endif
#endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
};

static inline int rt_bandwidth_enabled(void)
{
    return sysctl_sched_rt_runtime >= 0;
}

/* RT IPI pull logic requires IRQ_WORK */
#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP)
#define HAVE_RT_PUSH_IPI
#endif

/* Real-Time classes' related field in a runqueue: */
struct rt_rq {
    struct rt_prio_array active;
    unsigned int rt_nr_running;
    unsigned int rr_nr_running;
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
    struct {
        int curr; /* highest queued rt task prio */
#ifdef CONFIG_SMP
        int next; /* next highest */
#endif
    } highest_prio;
#endif
#ifdef CONFIG_SMP
    unsigned long rt_nr_migratory;
    unsigned long rt_nr_total;
    int overloaded;
    struct plist_head pushable_tasks;

#endif /* CONFIG_SMP */
    int rt_queued;

    int rt_throttled;
    u64 rt_time;
    u64 rt_runtime;
    /* Nests inside the rq lock: */
    raw_spinlock_t rt_runtime_lock;

#ifdef CONFIG_RT_GROUP_SCHED
    unsigned long rt_nr_boosted;

    struct rq *rq;
    struct task_group *tg;
#endif
};

static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq)
{
    return rt_rq->rt_queued && rt_rq->rt_nr_running;
}

/* Deadline class' related fields in a runqueue */
struct dl_rq {
    /* runqueue is an rbtree, ordered by deadline */
    struct rb_root_cached root;

    unsigned long dl_nr_running;

#ifdef CONFIG_SMP
    /*
     * Deadline values of the currently executing and the
     * earliest ready task on this rq. Caching these facilitates
     * the decision whether or not a ready but not running task
     * should migrate somewhere else.
     */
    struct {
        u64 curr;
        u64 next;
    } earliest_dl;

    unsigned long dl_nr_migratory;
    int overloaded;

    /*
     * Tasks on this rq that can be pushed away. They are kept in
     * an rb-tree, ordered by tasks' deadlines, with caching
     * of the leftmost (earliest deadline) element.
     */
    struct rb_root_cached pushable_dl_tasks_root;
#else
    struct dl_bw dl_bw;
#endif
    /*
     * "Active utilization" for this runqueue: increased when a
     * task wakes up (becomes TASK_RUNNING) and decreased when a
     * task blocks
     */
    u64 running_bw;

    /*
     * Utilization of the tasks "assigned" to this runqueue (including
     * the tasks that are in runqueue and the tasks that executed on this
     * CPU and blocked). Increased when a task moves to this runqueue, and
     * decreased when the task moves away (migrates, changes scheduling
     * policy, or terminates).
     * This is needed to compute the "inactive utilization" for the
     * runqueue (inactive utilization = this_bw - running_bw).
     */
    u64 this_bw;
    u64 extra_bw;

    /*
     * Inverse of the fraction of CPU utilization that can be reclaimed
     * by the GRUB algorithm.
     */
    u64 bw_ratio;
};

#ifdef CONFIG_FAIR_GROUP_SCHED
/* An entity is a task if it doesn't "own" a runqueue */
#define entity_is_task(se) (!se->my_q)

static inline void se_update_runnable(struct sched_entity *se)
{
    if (!entity_is_task(se)) {
        se->runnable_weight = se->my_q->h_nr_running;
    }
}

static inline long se_runnable(struct sched_entity *se)
{
    if (entity_is_task(se)) {
        return !!se->on_rq;
    } else {
        return se->runnable_weight;
    }
}

#else
#define entity_is_task(se) 1

static inline void se_update_runnable(struct sched_entity *se)
{
}

static inline long se_runnable(struct sched_entity *se)
{
    return !!se->on_rq;
}
#endif

#ifdef CONFIG_SMP
/*
 * XXX we want to get rid of these helpers and use the full load resolution.
 */
static inline long se_weight(struct sched_entity *se)
{
    return scale_load_down(se->load.weight);
}

static inline bool sched_asym_prefer(int a, int b)
{
    return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b);
}

struct perf_domain {
    struct em_perf_domain *em_pd;
    struct perf_domain *next;
    struct rcu_head rcu;
};

/* Scheduling group status flags */
#define SG_OVERLOAD 0x1     /* More than one runnable task on a CPU. */
#define SG_OVERUTILIZED 0x2 /* One or more CPUs are over-utilized. */

/*
 * We add the notion of a root-domain which will be used to define per-domain
 * variables. Each exclusive cpuset essentially defines an island domain by
 * fully partitioning the member CPUs from any other cpuset. Whenever a new
 * exclusive cpuset is created, we also create and attach a new root-domain
 * object.
 *
 */
struct root_domain {
    atomic_t refcount;
    atomic_t rto_count;
    struct rcu_head rcu;
    cpumask_var_t span;
    cpumask_var_t online;

    /*
     * Indicate pullable load on at least one CPU, e.g:
     * - More than one runnable task
     * - Running task is misfit
     */
    int overload;

    /* Indicate one or more cpus over-utilized (tipping point) */
    int overutilized;

    /*
     * The bit corresponding to a CPU gets set here if such CPU has more
     * than one runnable -deadline task (as it is below for RT tasks).
     */
    cpumask_var_t dlo_mask;
    atomic_t dlo_count;
    struct dl_bw dl_bw;
    struct cpudl cpudl;

#ifdef HAVE_RT_PUSH_IPI
    /*
     * For IPI pull requests, loop across the rto_mask.
     */
    struct irq_work rto_push_work;
    raw_spinlock_t rto_lock;
    /* These are only updated and read within rto_lock */
    int rto_loop;
    int rto_cpu;
    /* These atomics are updated outside of a lock */
    atomic_t rto_loop_next;
    atomic_t rto_loop_start;
#endif
    /*
     * The "RT overload" flag: it gets set if a CPU has more than
     * one runnable RT task.
     */
    cpumask_var_t rto_mask;
    struct cpupri cpupri;

    unsigned long max_cpu_capacity;

    /*
     * NULL-terminated list of performance domains intersecting with the
     * CPUs of the rd. Protected by RCU.
     */
    struct perf_domain __rcu *pd;
#ifdef CONFIG_SCHED_RT_CAS
    int max_cap_orig_cpu;
#endif
};

extern void init_defrootdomain(void);
extern int sched_init_domains(const struct cpumask *cpu_map);
extern void rq_attach_root(struct rq *rq, struct root_domain *rd);
extern void sched_get_rd(struct root_domain *rd);
extern void sched_put_rd(struct root_domain *rd);

#ifdef HAVE_RT_PUSH_IPI
extern void rto_push_irq_work_func(struct irq_work *work);
#endif
#endif /* CONFIG_SMP */

#ifdef CONFIG_UCLAMP_TASK
/*
 * struct uclamp_bucket - Utilization clamp bucket
 * @value: utilization clamp value for tasks on this clamp bucket
 * @tasks: number of RUNNABLE tasks on this clamp bucket
 *
 * Keep track of how many tasks are RUNNABLE for a given utilization
 * clamp value.
 */
struct uclamp_bucket {
    unsigned long value : bits_per(SCHED_CAPACITY_SCALE);
    unsigned long tasks : BITS_PER_LONG - bits_per(SCHED_CAPACITY_SCALE);
};

/*
 * struct uclamp_rq - rq's utilization clamp
 * @value: currently active clamp values for a rq
 * @bucket: utilization clamp buckets affecting a rq
 *
 * Keep track of RUNNABLE tasks on a rq to aggregate their clamp values.
 * A clamp value is affecting a rq when there is at least one task RUNNABLE
 * (or actually running) with that value.
 *
 * There are up to UCLAMP_CNT possible different clamp values, currently there
 * are only two: minimum utilization and maximum utilization.
 *
 * All utilization clamping values are MAX aggregated, since:
 * - for util_min: we want to run the CPU at least at the max of the minimum
 *   utilization required by its currently RUNNABLE tasks.
 * - for util_max: we want to allow the CPU to run up to the max of the
 *   maximum utilization allowed by its currently RUNNABLE tasks.
 *
 * Since on each system we expect only a limited number of different
 * utilization clamp values (UCLAMP_BUCKETS), use a simple array to track
 * the metrics required to compute all the per-rq utilization clamp values.
 */
struct uclamp_rq {
    unsigned int value;
    struct uclamp_bucket bucket[UCLAMP_BUCKETS];
};

DECLARE_STATIC_KEY_FALSE(sched_uclamp_used);
#endif /* CONFIG_UCLAMP_TASK */

/*
 * This is the main, per-CPU runqueue data structure.
 *
 * Locking rule: those places that want to lock multiple runqueues
 * (such as the load balancing or the thread migration code), lock
 * acquire operations must be ordered by ascending &runqueue.
 */
struct rq {
    /* runqueue lock: */
    raw_spinlock_t lock;

    /*
     * nr_running and cpu_load should be in the same cacheline because
     * remote CPUs use both these fields when doing load calculation.
     */
    unsigned int nr_running;
#ifdef CONFIG_NUMA_BALANCING
    unsigned int nr_numa_running;
    unsigned int nr_preferred_running;
    unsigned int numa_migrate_on;
#endif
#ifdef CONFIG_NO_HZ_COMMON
#ifdef CONFIG_SMP
    unsigned long last_blocked_load_update_tick;
    unsigned int has_blocked_load;
    call_single_data_t nohz_csd;
#endif /* CONFIG_SMP */
    unsigned int nohz_tick_stopped;
    atomic_t nohz_flags;
#endif /* CONFIG_NO_HZ_COMMON */

#ifdef CONFIG_SMP
    unsigned int ttwu_pending;
#endif
    u64 nr_switches;

#ifdef CONFIG_UCLAMP_TASK
    /* Utilization clamp values based on CPU's RUNNABLE tasks */
    struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned;
    unsigned int uclamp_flags;
#define UCLAMP_FLAG_IDLE 0x01
#endif

    struct cfs_rq cfs;
    struct rt_rq rt;
    struct dl_rq dl;

#ifdef CONFIG_FAIR_GROUP_SCHED
    /* list of leaf cfs_rq on this CPU: */
    struct list_head leaf_cfs_rq_list;
    struct list_head *tmp_alone_branch;
#endif /* CONFIG_FAIR_GROUP_SCHED */

    /*
     * This is part of a global counter where only the total sum
     * over all CPUs matters. A task can increase this counter on
     * one CPU and if it got migrated afterwards it may decrease
     * it on another CPU. Always updated under the runqueue lock:
     */
    unsigned long nr_uninterruptible;

    struct task_struct __rcu *curr;
    struct task_struct *idle;
    struct task_struct *stop;
    unsigned long next_balance;
    struct mm_struct *prev_mm;

    unsigned int clock_update_flags;
    u64 clock;
    /* Ensure that all clocks are in the same cache line */
    u64 clock_task ____cacheline_aligned;
    u64 clock_pelt;
    unsigned long lost_idle_time;

    atomic_t nr_iowait;

#ifdef CONFIG_MEMBARRIER
    int membarrier_state;
#endif

#ifdef CONFIG_SMP
    struct root_domain *rd;
    struct sched_domain __rcu *sd;

    unsigned long cpu_capacity;
    unsigned long cpu_capacity_orig;

    struct callback_head *balance_callback;

    unsigned char nohz_idle_balance;
    unsigned char idle_balance;

    unsigned long misfit_task_load;

    /* For active balancing */
    int active_balance;
    int push_cpu;
#ifdef CONFIG_SCHED_EAS
    struct task_struct *push_task;
#endif
    struct cpu_stop_work active_balance_work;

    /* For rt active balancing */
#ifdef CONFIG_SCHED_RT_ACTIVE_LB
    int rt_active_balance;
    struct task_struct *rt_push_task;
    struct cpu_stop_work rt_active_balance_work;
#endif

    /* CPU of this runqueue: */
    int cpu;
    int online;

    struct list_head cfs_tasks;

    struct sched_avg avg_rt;
    struct sched_avg avg_dl;
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
    struct sched_avg avg_irq;
#endif
#ifdef CONFIG_SCHED_THERMAL_PRESSURE
    struct sched_avg avg_thermal;
#endif
    u64 idle_stamp;
    u64 avg_idle;

    /* This is used to determine avg_idle's max value */
    u64 max_idle_balance_cost;
#endif /* CONFIG_SMP */

#ifdef CONFIG_SCHED_WALT
    struct sched_cluster *cluster;
    struct cpumask freq_domain_cpumask;
    struct walt_sched_stats walt_stats;

    u64 window_start;
    unsigned long walt_flags;

    u64 cur_irqload;
    u64 avg_irqload;
    u64 irqload_ts;
    u64 curr_runnable_sum;
    u64 prev_runnable_sum;
    u64 nt_curr_runnable_sum;
    u64 nt_prev_runnable_sum;
    u64 cum_window_demand_scaled;
    struct load_subtractions load_subs[NUM_TRACKED_WINDOWS];
#ifdef CONFIG_SCHED_RTG
    struct group_cpu_time grp_time;
#endif
#endif /* CONFIG_SCHED_WALT */

#ifdef CONFIG_IRQ_TIME_ACCOUNTING
    u64 prev_irq_time;
#endif
#ifdef CONFIG_PARAVIRT
    u64 prev_steal_time;
#endif
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
    u64 prev_steal_time_rq;
#endif

    /* calc_load related fields */
    unsigned long calc_load_update;
    long calc_load_active;

#ifdef CONFIG_SCHED_HRTICK
#ifdef CONFIG_SMP
    call_single_data_t hrtick_csd;
#endif
    struct hrtimer hrtick_timer;
    ktime_t hrtick_time;
#endif

#ifdef CONFIG_SCHEDSTATS
    /* latency stats */
    struct sched_info rq_sched_info;
    unsigned long long rq_cpu_time;
    /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */

    /* sys_sched_yield() stats */
    unsigned int yld_count;

    /* schedule() stats */
    unsigned int sched_count;
    unsigned int sched_goidle;

    /* try_to_wake_up() stats */
    unsigned int ttwu_count;
    unsigned int ttwu_local;
#endif

#ifdef CONFIG_CPU_IDLE
    /* Must be inspected within a rcu lock section */
    struct cpuidle_state *idle_state;
#endif
};

#ifdef CONFIG_FAIR_GROUP_SCHED

/* CPU runqueue to which this cfs_rq is attached */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
    return cfs_rq->rq;
}

#else

static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
    return container_of(cfs_rq, struct rq, cfs);
}
#endif

static inline int cpu_of(struct rq *rq)
{
#ifdef CONFIG_SMP
    return rq->cpu;
#else
    return 0;
#endif
}

#ifdef CONFIG_SCHED_SMT
extern void __update_idle_core(struct rq *rq);

static inline void update_idle_core(struct rq *rq)
{
    if (static_branch_unlikely(&sched_smt_present)) {
        __update_idle_core(rq);
    }
}

#else
static inline void update_idle_core(struct rq *rq)
{
}
#endif

DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);

#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
#define this_rq() this_cpu_ptr(&runqueues)
#define task_rq(p) cpu_rq(task_cpu(p))
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() raw_cpu_ptr(&runqueues)

extern void update_rq_clock(struct rq *rq);

static inline u64 __rq_clock_broken(struct rq *rq)
{
    return READ_ONCE(rq->clock);
}

/*
 * rq::clock_update_flags bits
 *
 * %RQCF_REQ_SKIP - will request skipping of clock update on the next
 *  call to __schedule(). This is an optimisation to avoid
 *  neighbouring rq clock updates.
 *
 * %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is
 *  in effect and calls to update_rq_clock() are being ignored.
 *
 * %RQCF_UPDATED - is a debug flag that indicates whether a call has been
 *  made to update_rq_clock() since the last time rq::lock was pinned.
 *
 * If inside of __schedule(), clock_update_flags will have been
 * shifted left (a left shift is a cheap operation for the fast path
 * to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use,
 *
 *    if (rq-clock_update_flags >= RQCF_UPDATED)
 *
 * to check if %RQCF_UPADTED is set. It'll never be shifted more than
 * one position though, because the next rq_unpin_lock() will shift it
 * back.
 */
#define RQCF_REQ_SKIP 0x01
#define RQCF_ACT_SKIP 0x02
#define RQCF_UPDATED 0x04

static inline void assert_clock_updated(struct rq *rq)
{
    /*
     * The only reason for not seeing a clock update since the
     * last rq_pin_lock() is if we're currently skipping updates.
     */
    SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP);
}

static inline u64 rq_clock(struct rq *rq)
{
    lockdep_assert_held(&rq->lock);
    assert_clock_updated(rq);

    return rq->clock;
}

static inline u64 rq_clock_task(struct rq *rq)
{
    lockdep_assert_held(&rq->lock);
    assert_clock_updated(rq);

    return rq->clock_task;
}

/**
 * By default the decay is the default pelt decay period.
 * The decay shift can change the decay period in
 * multiples of 32.
 *  Decay shift        Decay period(ms)
 *    0            32
 *    1            64
 *    2            128
 *    3            256
 *    4            512
 */
extern int sched_thermal_decay_shift;

static inline u64 rq_clock_thermal(struct rq *rq)
{
    return rq_clock_task(rq) >> sched_thermal_decay_shift;
}

static inline void rq_clock_skip_update(struct rq *rq)
{
    lockdep_assert_held(&rq->lock);
    rq->clock_update_flags |= RQCF_REQ_SKIP;
}

/*
 * See rt task throttling, which is the only time a skip
 * request is cancelled.
 */
static inline void rq_clock_cancel_skipupdate(struct rq *rq)
{
    lockdep_assert_held(&rq->lock);
    rq->clock_update_flags &= ~RQCF_REQ_SKIP;
}

struct rq_flags {
    unsigned long flags;
    struct pin_cookie cookie;
#ifdef CONFIG_SCHED_DEBUG
    /*
     * A copy of (rq::clock_update_flags & RQCF_UPDATED) for the
     * current pin context is stashed here in case it needs to be
     * restored in rq_repin_lock().
     */
    unsigned int clock_update_flags;
#endif
};

/*
 * Lockdep annotation that avoids accidental unlocks; it's like a
 * sticky/continuous lockdep_assert_held().
 *
 * This avoids code that has access to 'struct rq *rq' (basically everything in
 * the scheduler) from accidentally unlocking the rq if they do not also have a
 * copy of the (on-stack) 'struct rq_flags rf'.
 *
 * Also see Documentation/locking/lockdep-design.rst.
 */
static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
{
    rf->cookie = lockdep_pin_lock(&rq->lock);

#ifdef CONFIG_SCHED_DEBUG
    rq->clock_update_flags &= (RQCF_REQ_SKIP | RQCF_ACT_SKIP);
    rf->clock_update_flags = 0;
#endif
}

static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
{
#ifdef CONFIG_SCHED_DEBUG
    if (rq->clock_update_flags > RQCF_ACT_SKIP) {
        rf->clock_update_flags = RQCF_UPDATED;
    }
#endif

    lockdep_unpin_lock(&rq->lock, rf->cookie);
}

static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
{
    lockdep_repin_lock(&rq->lock, rf->cookie);

#ifdef CONFIG_SCHED_DEBUG
    /*
     * Restore the value we stashed in @rf for this pin context.
     */
    rq->clock_update_flags |= rf->clock_update_flags;
#endif
}

struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) __acquires(rq->lock);

struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) __acquires(p->pi_lock) __acquires(rq->lock);

static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) __releases(rq->lock)
{
    rq_unpin_lock(rq, rf);
    raw_spin_unlock(&rq->lock);
}

static inline void task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) __releases(rq->lock)
    __releases(p->pi_lock)
{
    rq_unpin_lock(rq, rf);
    raw_spin_unlock(&rq->lock);
    raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}

static inline void rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock)
{
    raw_spin_lock_irqsave(&rq->lock, rf->flags);
    rq_pin_lock(rq, rf);
}

static inline void rq_lock_irq(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock)
{
    raw_spin_lock_irq(&rq->lock);
    rq_pin_lock(rq, rf);
}

static inline void rq_lock(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock)
{
    raw_spin_lock(&rq->lock);
    rq_pin_lock(rq, rf);
}

static inline void rq_relock(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock)
{
    raw_spin_lock(&rq->lock);
    rq_repin_lock(rq, rf);
}

static inline void rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) __releases(rq->lock)
{
    rq_unpin_lock(rq, rf);
    raw_spin_unlock_irqrestore(&rq->lock, rf->flags);
}

static inline void rq_unlock_irq(struct rq *rq, struct rq_flags *rf) __releases(rq->lock)
{
    rq_unpin_lock(rq, rf);
    raw_spin_unlock_irq(&rq->lock);
}

static inline void rq_unlock(struct rq *rq, struct rq_flags *rf) __releases(rq->lock)
{
    rq_unpin_lock(rq, rf);
    raw_spin_unlock(&rq->lock);
}

static inline struct rq *this_rq_lock_irq(struct rq_flags *rf) __acquires(rq->lock)
{
    struct rq *rq;

    local_irq_disable();
    rq = this_rq();
    rq_lock(rq, rf);
    return rq;
}

#ifdef CONFIG_NUMA
enum numa_topology_type {
    NUMA_DIRECT,
    NUMA_GLUELESS_MESH,
    NUMA_BACKPLANE,
};
extern enum numa_topology_type sched_numa_topology_type;
extern int sched_max_numa_distance;
extern bool find_numa_distance(int distance);
extern void sched_init_numa(void);
extern void sched_domains_numa_masks_set(unsigned int cpu);
extern void sched_domains_numa_masks_clear(unsigned int cpu);
extern int sched_numa_find_closest(const struct cpumask *cpus, int cpu);
#else
static inline void sched_init_numa(void)
{
}
static inline void sched_domains_numa_masks_set(unsigned int cpu)
{
}
static inline void sched_domains_numa_masks_clear(unsigned int cpu)
{
}
static inline int sched_numa_find_closest(const struct cpumask *cpus, int cpu)
{
    return nr_cpu_ids;
}
#endif

#ifdef CONFIG_NUMA_BALANCING
/* The regions in numa_faults array from task_struct */
enum numa_faults_stats { NUMA_MEM = 0, NUMA_CPU, NUMA_MEMBUF, NUMA_CPUBUF };
extern void sched_setnuma(struct task_struct *p, int node);
extern int migrate_task_to(struct task_struct *p, int cpu);
extern int migrate_swap(struct task_struct *p, struct task_struct *t, int cpu, int scpu);
extern void init_numa_balancing(unsigned long clone_flags, struct task_struct *p);
#else
static inline void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
{
}
#endif /* CONFIG_NUMA_BALANCING */

#ifdef CONFIG_SMP

static inline void queue_balance_callback(struct rq *rq, struct callback_head *head, void (*func)(struct rq *rq))
{
    lockdep_assert_held(&rq->lock);

    if (unlikely(head->next)) {
        return;
    }

    head->func = (void (*)(struct callback_head *))func;
    head->next = rq->balance_callback;
    rq->balance_callback = head;
}

#define rcu_dereference_check_sched_domain(p) rcu_dereference_check((p), lockdep_is_held(&sched_domains_mutex))

/*
 * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
 * See destroy_sched_domains: call_rcu for details.
 *
 * The domain tree of any CPU may only be accessed from within
 * preempt-disabled sections.
 */
#define for_each_domain(cpu, __sd)                                                                                     \
    for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); __sd; __sd = __sd->parent)

/**
 * highest_flag_domain - Return highest sched_domain containing flag.
 * @cpu:    The CPU whose highest level of sched domain is to
 *        be returned.
 * @flag:    The flag to check for the highest sched_domain
 *        for the given CPU.
 *
 * Returns the highest sched_domain of a CPU which contains the given flag.
 */
static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
{
    struct sched_domain *sd, *hsd = NULL;

    for (sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); sd; sd = sd->parent) {
        if (!(sd->flags & flag)) {
            break;
        }
        hsd = sd;
    }

    return hsd;
}

static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
{
    struct sched_domain *sd;

    for (sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); sd; sd = sd->parent) {
        if (sd->flags & flag) {
            break;
        }
    }

    return sd;
}

DECLARE_PER_CPU(struct sched_domain __rcu *, sd_llc);
DECLARE_PER_CPU(int, sd_llc_size);
DECLARE_PER_CPU(int, sd_llc_id);
DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity);
extern struct static_key_false sched_asym_cpucapacity;

struct sched_group_capacity {
    atomic_t ref;
    /*
     * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
     * for a single CPU.
     */
    unsigned long capacity;
    unsigned long min_capacity; /* Min per-CPU capacity in group */
    unsigned long max_capacity; /* Max per-CPU capacity in group */
    unsigned long next_update;
    int imbalance; /* XXX unrelated to capacity but shared group state */

#ifdef CONFIG_SCHED_DEBUG
    int id;
#endif

    unsigned long cpumask[]; /* Balance mask */
};

struct sched_group {
    struct sched_group *next; /* Must be a circular list */
    atomic_t ref;

    unsigned int group_weight;
    struct sched_group_capacity *sgc;
    int asym_prefer_cpu; /* CPU of highest priority in group */

    /*
     * The CPUs this group covers.
     *
     * 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 cpumask[];
};

static inline struct cpumask *sched_group_span(struct sched_group *sg)
{
    return to_cpumask(sg->cpumask);
}

/*
 * See build_balance_mask().
 */
static inline struct cpumask *group_balance_mask(struct sched_group *sg)
{
    return to_cpumask(sg->sgc->cpumask);
}

/**
 * group_first_cpu - Returns the first CPU in the cpumask of a sched_group.
 * @group: The group whose first CPU is to be returned.
 */
static inline unsigned int group_first_cpu(struct sched_group *group)
{
    return cpumask_first(sched_group_span(group));
}

extern int group_balance_cpu(struct sched_group *sg);

#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
void register_sched_domain_sysctl(void);
void dirty_sched_domain_sysctl(int cpu);
void unregister_sched_domain_sysctl(void);
#else
static inline void register_sched_domain_sysctl(void)
{
}
static inline void dirty_sched_domain_sysctl(int cpu)
{
}
static inline void unregister_sched_domain_sysctl(void)
{
}
#endif

extern void flush_smp_call_function_from_idle(void);

#else /* !CONFIG_SMP: */
static inline void flush_smp_call_function_from_idle(void)
{
}
#endif

#include "stats.h"
#include "autogroup.h"

#ifdef CONFIG_CGROUP_SCHED

/*
 * Return the group to which this tasks belongs.
 *
 * We cannot use task_css() and friends because the cgroup subsystem
 * changes that value before the cgroup_subsys::attach() method is called,
 * therefore we cannot pin it and might observe the wrong value.
 *
 * The same is true for autogroup's p->signal->autogroup->tg, the autogroup
 * core changes this before calling sched_move_task().
 *
 * Instead we use a 'copy' which is updated from sched_move_task() while
 * holding both task_struct::pi_lock and rq::lock.
 */
static inline struct task_group *task_group(struct task_struct *p)
{
    return p->sched_task_group;
}

/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
    struct task_group *tg = task_group(p);
#endif

#ifdef CONFIG_FAIR_GROUP_SCHED
    set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]);
    p->se.cfs_rq = tg->cfs_rq[cpu];
    p->se.parent = tg->se[cpu];
#endif

#ifdef CONFIG_RT_GROUP_SCHED
    p->rt.rt_rq = tg->rt_rq[cpu];
    p->rt.parent = tg->rt_se[cpu];
#endif
}

#else /* CONFIG_CGROUP_SCHED */

static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
}
static inline struct task_group *task_group(struct task_struct *p)
{
    return NULL;
}

#endif /* CONFIG_CGROUP_SCHED */

static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
{
    set_task_rq(p, cpu);
#ifdef CONFIG_SMP
    /*
     * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
     * successfully executed on another CPU. We must ensure that updates of
     * per-task data have been completed by this moment.
     */
    smp_wmb();
#ifdef CONFIG_THREAD_INFO_IN_TASK
    WRITE_ONCE(p->cpu, cpu);
#else
    WRITE_ONCE(task_thread_info(p)->cpu, cpu);
#endif
    p->wake_cpu = cpu;
#endif
}

/*
 * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
 */
#ifdef CONFIG_SCHED_DEBUG
#include <linux/static_key.h>
#define const_debug __read_mostly
#else
#define const_debug const
#endif

#define SCHED_FEAT(name, enabled) __SCHED_FEAT_##name,

enum {
#include "features.h"
    __SCHED_FEAT_NR,
};

#undef SCHED_FEAT

#ifdef CONFIG_SCHED_DEBUG

/*
 * To support run-time toggling of sched features, all the translation units
 * (but core.c) reference the sysctl_sched_features defined in core.c.
 */
extern const_debug unsigned int sysctl_sched_features;

#ifdef CONFIG_JUMP_LABEL
#define SCHED_FEAT(name, enabled)                                                                                      \
    static __always_inline bool static_branch_##name(struct static_key *key)                                           \
    {                                                                                                                  \
        return static_key_##enabled(key);                                                                              \
    }

#include "features.h"
#undef SCHED_FEAT

extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))

#else /* !CONFIG_JUMP_LABEL */

#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))

#endif /* CONFIG_JUMP_LABEL */

#else /* !SCHED_DEBUG */

/*
 * Each translation unit has its own copy of sysctl_sched_features to allow
 * constants propagation at compile time and compiler optimization based on
 * features default.
 */
#define SCHED_FEAT(name, enabled) (1UL << __SCHED_FEAT_##name) * (enabled) |
static const_debug __maybe_unused unsigned int sysctl_sched_features =
#include "features.h"
    0;
#undef SCHED_FEAT

#define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x))

#endif /* SCHED_DEBUG */

extern struct static_key_false sched_numa_balancing;
extern struct static_key_false sched_schedstats;

static inline u64 global_rt_period(void)
{
    return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
}

static inline u64 global_rt_runtime(void)
{
    if (sysctl_sched_rt_runtime < 0) {
        return RUNTIME_INF;
    }

    return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
}

static inline int task_current(struct rq *rq, struct task_struct *p)
{
    return rq->curr == p;
}

static inline int task_running(struct rq *rq, struct task_struct *p)
{
#ifdef CONFIG_SMP
    return p->on_cpu;
#else
    return task_current(rq, p);
#endif
}

static inline int task_on_rq_queued(struct task_struct *p)
{
    return p->on_rq == TASK_ON_RQ_QUEUED;
}

static inline int task_on_rq_migrating(struct task_struct *p)
{
    return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
}

/*
 * wake flags
 */
#define WF_SYNC 0x01     /* Waker goes to sleep after wakeup */
#define WF_FORK 0x02     /* Child wakeup after fork */
#define WF_MIGRATED 0x04 /* Internal use, task got migrated */
#define WF_ON_CPU 0x08   /* Wakee is on_cpu */

/*
 * To aid in avoiding the subversion of "niceness" due to uneven distribution
 * of tasks with abnormal "nice" values across CPUs the contribution that
 * each task makes to its run queue's load is weighted according to its
 * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
 * scaled version of the new time slice allocation that they receive on time
 * slice expiry etc.
 */

#define WEIGHT_IDLEPRIO 3
#define WMULT_IDLEPRIO 1431655765

extern const int sched_prio_to_weight[40];
extern const u32 sched_prio_to_wmult[40];
#ifdef CONFIG_SCHED_LATENCY_NICE
extern const int		sched_latency_to_weight[40];
#endif

/*
 * {de,en}queue flags:
 *
 * DEQUEUE_SLEEP  - task is no longer runnable
 * ENQUEUE_WAKEUP - task just became runnable
 *
 * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks
 *                are in a known state which allows modification. Such pairs
 *                should preserve as much state as possible.
 *
 * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location
 *        in the runqueue.
 *
 * ENQUEUE_HEAD      - place at front of runqueue (tail if not specified)
 * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
 * ENQUEUE_MIGRATED  - the task was migrated during wakeup
 *
 */

#define DEQUEUE_SLEEP 0x01
#define DEQUEUE_SAVE 0x02    /* Matches ENQUEUE_RESTORE */
#define DEQUEUE_MOVE 0x04    /* Matches ENQUEUE_MOVE */
#define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */

#define ENQUEUE_WAKEUP 0x01
#define ENQUEUE_RESTORE 0x02
#define ENQUEUE_MOVE 0x04
#define ENQUEUE_NOCLOCK 0x08

#define ENQUEUE_HEAD 0x10
#define ENQUEUE_REPLENISH 0x20
#ifdef CONFIG_SMP
#define ENQUEUE_MIGRATED 0x40
#else
#define ENQUEUE_MIGRATED 0x00
#endif

#define ENQUEUE_WAKEUP_SYNC 0x80

#define RETRY_TASK ((void *)-1UL)

struct sched_class {
#ifdef CONFIG_UCLAMP_TASK
    int uclamp_enabled;
#endif

    void (*enqueue_task)(struct rq *rq, struct task_struct *p, int flags);
    void (*dequeue_task)(struct rq *rq, struct task_struct *p, int flags);
    void (*yield_task)(struct rq *rq);
    bool (*yield_to_task)(struct rq *rq, struct task_struct *p);

    void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags);

    struct task_struct *(*pick_next_task)(struct rq *rq);

    void (*put_prev_task)(struct rq *rq, struct task_struct *p);
    void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);

#ifdef CONFIG_SMP
    int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
    int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags);
    void (*migrate_task_rq)(struct task_struct *p, int new_cpu);

    void (*task_woken)(struct rq *this_rq, struct task_struct *task);

    void (*set_cpus_allowed)(struct task_struct *p, const struct cpumask *newmask);

    void (*rq_online)(struct rq *rq);
    void (*rq_offline)(struct rq *rq);
#endif

    void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
    void (*task_fork)(struct task_struct *p);
    void (*task_dead)(struct task_struct *p);

    /*
     * The switched_from() call is allowed to drop rq->lock, therefore we
     * cannot assume the switched_from/switched_to pair is serliazed by
     * rq->lock. They are however serialized by p->pi_lock.
     */
    void (*switched_from)(struct rq *this_rq, struct task_struct *task);
    void (*switched_to)(struct rq *this_rq, struct task_struct *task);
    void (*prio_changed)(struct rq *this_rq, struct task_struct *task, int oldprio);

    unsigned int (*get_rr_interval)(struct rq *rq, struct task_struct *task);

    void (*update_curr)(struct rq *rq);

#define TASK_SET_GROUP 0
#define TASK_MOVE_GROUP 1

#ifdef CONFIG_FAIR_GROUP_SCHED
    void (*task_change_group)(struct task_struct *p, int type);
#endif
#ifdef CONFIG_SCHED_WALT
    void (*fixup_walt_sched_stats)(struct rq *rq, struct task_struct *p, u16 updated_demand_scaled);
#endif
#ifdef CONFIG_SCHED_EAS
    void (*check_for_migration)(struct rq *rq, struct task_struct *p);
#endif
} __aligned(STRUCT_ALIGNMENT); /* STRUCT_ALIGN(), vmlinux.lds.h */

static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
{
    WARN_ON_ONCE(rq->curr != prev);
    prev->sched_class->put_prev_task(rq, prev);
}

static inline void set_next_task(struct rq *rq, struct task_struct *next)
{
    WARN_ON_ONCE(rq->curr != next);
    next->sched_class->set_next_task(rq, next, false);
}

/* Defined in include/asm-generic/vmlinux.lds.h */
extern struct sched_class __begin_sched_classes[];
extern struct sched_class __end_sched_classes[];

#define sched_class_highest (__end_sched_classes - 1)
#define sched_class_lowest (__begin_sched_classes - 1)

#define for_class_range(class, _from, _to) for (class = (_from); class != (_to); (class)--)

#define for_each_class(class) for_class_range(class, sched_class_highest, sched_class_lowest)

extern const struct sched_class stop_sched_class;
extern const struct sched_class dl_sched_class;
extern const struct sched_class rt_sched_class;
extern const struct sched_class fair_sched_class;
extern const struct sched_class idle_sched_class;

static inline bool sched_stop_runnable(struct rq *rq)
{
    return rq->stop && task_on_rq_queued(rq->stop);
}

static inline bool sched_dl_runnable(struct rq *rq)
{
    return rq->dl.dl_nr_running > 0;
}

static inline bool sched_rt_runnable(struct rq *rq)
{
    return rq->rt.rt_queued > 0;
}

static inline bool sched_fair_runnable(struct rq *rq)
{
    return rq->cfs.nr_running > 0;
}

extern struct task_struct *pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
extern struct task_struct *pick_next_task_idle(struct rq *rq);

#ifdef CONFIG_SMP

extern void update_group_capacity(struct sched_domain *sd, int cpu);

extern void trigger_load_balance(struct rq *rq);

extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask);

#endif

#ifdef CONFIG_CPU_IDLE
static inline void idle_set_state(struct rq *rq, struct cpuidle_state *idle_state)
{
    rq->idle_state = idle_state;
}

static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
    SCHED_WARN_ON(!rcu_read_lock_held());

    return rq->idle_state;
}
#else
static inline void idle_set_state(struct rq *rq, struct cpuidle_state *idle_state)
{
}

static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
    return NULL;
}
#endif

extern void schedule_idle(void);

extern void sysrq_sched_debug_show(void);
extern void sched_init_granularity(void);
extern void update_max_interval(void);

extern void init_sched_dl_class(void);
extern void init_sched_rt_class(void);
extern void init_sched_fair_class(void);

extern void reweight_task(struct task_struct *p, int prio);

extern void resched_curr(struct rq *rq);
extern void resched_cpu(int cpu);

extern struct rt_bandwidth def_rt_bandwidth;
extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);

extern struct dl_bandwidth def_dl_bandwidth;
extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime);
extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se);

#define BW_SHIFT 20
#define BW_UNIT (1 << BW_SHIFT)
#define RATIO_SHIFT 8
#define MAX_BW_BITS (64 - BW_SHIFT)
#define MAX_BW ((1ULL << MAX_BW_BITS) - 1)
unsigned long to_ratio(u64 period, u64 runtime);

extern void init_entity_runnable_average(struct sched_entity *se);
extern void post_init_entity_util_avg(struct task_struct *p);

#ifdef CONFIG_NO_HZ_FULL
extern bool sched_can_stop_tick(struct rq *rq);
extern int __init sched_tick_offload_init(void);

/*
 * Tick may be needed by tasks in the runqueue depending on their policy and
 * requirements. If tick is needed, lets send the target an IPI to kick it out of
 * nohz mode if necessary.
 */
static inline void sched_update_tick_dependency(struct rq *rq)
{
    int cpu = cpu_of(rq);
    if (!tick_nohz_full_cpu(cpu)) {
        return;
    }

    if (sched_can_stop_tick(rq)) {
        tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED);
    } else {
        tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
    }
}
#else
static inline int sched_tick_offload_init(void)
{
    return 0;
}
static inline void sched_update_tick_dependency(struct rq *rq)
{
}
#endif

static inline void add_nr_running(struct rq *rq, unsigned count)
{
    unsigned prev_nr = rq->nr_running;

    rq->nr_running = prev_nr + count;
    if (trace_sched_update_nr_running_tp_enabled()) {
        call_trace_sched_update_nr_running(rq, count);
    }

#ifdef CONFIG_SMP
    if (prev_nr < TASK_ON_RQ_MIGRATING && rq->nr_running >= TASK_ON_RQ_MIGRATING) {
        if (!READ_ONCE(rq->rd->overload)) {
            WRITE_ONCE(rq->rd->overload, 1);
        }
    }
#endif

    sched_update_tick_dependency(rq);
}

static inline void sub_nr_running(struct rq *rq, unsigned count)
{
    rq->nr_running -= count;
    if (trace_sched_update_nr_running_tp_enabled()) {
        call_trace_sched_update_nr_running(rq, -count);
    }

    /* Check if we still need preemption */
    sched_update_tick_dependency(rq);
}

extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);

extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);

extern const_debug unsigned int sysctl_sched_nr_migrate;
extern const_debug unsigned int sysctl_sched_migration_cost;

#ifdef CONFIG_SCHED_HRTICK

/*
 * Use hrtick when:
 *  - enabled by features
 *  - hrtimer is actually high res
 */
static inline int hrtick_enabled(struct rq *rq)
{
    if (!sched_feat(HRTICK)) {
        return 0;
    }
    if (!cpu_active(cpu_of(rq))) {
        return 0;
    }
    return hrtimer_is_hres_active(&rq->hrtick_timer);
}

void hrtick_start(struct rq *rq, u64 delay);

#else

static inline int hrtick_enabled(struct rq *rq)
{
    return 0;
}

#endif /* CONFIG_SCHED_HRTICK */

#ifdef CONFIG_SCHED_WALT
u64 sched_ktime_clock(void);
#else
static inline u64 sched_ktime_clock(void)
{
    return sched_clock();
}
#endif

#ifndef arch_scale_freq_tick
static __always_inline void arch_scale_freq_tick(void)
{
}
#endif

#ifndef arch_scale_freq_capacity
/**
 * arch_scale_freq_capacity - get the frequency scale factor of a given CPU.
 * @cpu: the CPU in question.
 *
 * Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
 *
 *     f_curr
 *     ------ * SCHED_CAPACITY_SCALE
 *     f_max
 */
static __always_inline unsigned long arch_scale_freq_capacity(int cpu)
{
    return SCHED_CAPACITY_SCALE;
}
#endif

unsigned long capacity_curr_of(int cpu);
unsigned long cpu_util(int cpu);

#ifdef CONFIG_SMP
#ifdef CONFIG_SCHED_WALT
extern unsigned int sysctl_sched_use_walt_cpu_util;
extern unsigned int walt_disabled;
#endif
#ifdef CONFIG_PREEMPTION

static inline void double_rq_lock(struct rq *rq1, struct rq *rq2);

/*
 * fair double_lock_balance: Safely acquires both rq->locks in a fair
 * way at the expense of forcing extra atomic operations in all
 * invocations.  This assures that the double_lock is acquired using the
 * same underlying policy as the spinlock_t on this architecture, which
 * reduces latency compared to the unfair variant below.  However, it
 * also adds more overhead and therefore may reduce throughput.
 */
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) __releases(this_rq->lock)
    __acquires(busiest->lock) __acquires(this_rq->lock)
{
    raw_spin_unlock(&this_rq->lock);
    double_rq_lock(this_rq, busiest);

    return 1;
}

#else
/*
 * Unfair double_lock_balance: Optimizes throughput at the expense of
 * latency by eliminating extra atomic operations when the locks are
 * already in proper order on entry.  This favors lower CPU-ids and will
 * grant the double lock to lower CPUs over higher ids under contention,
 * regardless of entry order into the function.
 */
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) __releases(this_rq->lock)
    __acquires(busiest->lock) __acquires(this_rq->lock)
{
    int ret = 0;

    if (unlikely(!raw_spin_trylock(&busiest->lock))) {
        if (busiest < this_rq) {
            raw_spin_unlock(&this_rq->lock);
            raw_spin_lock(&busiest->lock);
            raw_spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
            ret = 1;
        } else {
            raw_spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
        }
    }
    return ret;
}

#endif /* CONFIG_PREEMPTION */

/*
 * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
 */
static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
{
    if (unlikely(!irqs_disabled())) {
        /* printk() doesn't work well under rq->lock */
        raw_spin_unlock(&this_rq->lock);
        BUG_ON(1);
    }

    return _double_lock_balance(this_rq, busiest);
}

static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) __releases(busiest->lock)
{
    raw_spin_unlock(&busiest->lock);
    lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
}

static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
{
    if (l1 > l2) {
        swap(l1, l2);
    }

    spin_lock(l1);
    spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}

static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2)
{
    if (l1 > l2) {
        swap(l1, l2);
    }

    spin_lock_irq(l1);
    spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}

static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2)
{
    if (l1 > l2) {
        swap(l1, l2);
    }

    raw_spin_lock(l1);
    raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}

/*
 * double_rq_lock - safely lock two runqueues
 *
 * Note this does not disable interrupts like task_rq_lock,
 * you need to do so manually before calling.
 */
static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) __acquires(rq1->lock) __acquires(rq2->lock)
{
    BUG_ON(!irqs_disabled());
    if (rq1 == rq2) {
        raw_spin_lock(&rq1->lock);
        __acquire(rq2->lock); /* Fake it out ;) */
    } else {
        if (rq1 < rq2) {
            raw_spin_lock(&rq1->lock);
            raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
        } else {
            raw_spin_lock(&rq2->lock);
            raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
        }
    }
}

/*
 * double_rq_unlock - safely unlock two runqueues
 *
 * Note this does not restore interrupts like task_rq_unlock,
 * you need to do so manually after calling.
 */
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) __releases(rq1->lock) __releases(rq2->lock)
{
    raw_spin_unlock(&rq1->lock);
    if (rq1 != rq2) {
        raw_spin_unlock(&rq2->lock);
    } else {
        __release(rq2->lock);
    }
}

extern void set_rq_online(struct rq *rq);
extern void set_rq_offline(struct rq *rq);
extern bool sched_smp_initialized;

#else /* CONFIG_SMP */

/*
 * double_rq_lock - safely lock two runqueues
 *
 * Note this does not disable interrupts like task_rq_lock,
 * you need to do so manually before calling.
 */
static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) __acquires(rq1->lock) __acquires(rq2->lock)
{
    BUG_ON(!irqs_disabled());
    BUG_ON(rq1 != rq2);
    raw_spin_lock(&rq1->lock);
    __acquire(rq2->lock); /* Fake it out ;) */
}

/*
 * double_rq_unlock - safely unlock two runqueues
 *
 * Note this does not restore interrupts like task_rq_unlock,
 * you need to do so manually after calling.
 */
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) __releases(rq1->lock) __releases(rq2->lock)
{
    BUG_ON(rq1 != rq2);
    raw_spin_unlock(&rq1->lock);
    __release(rq2->lock);
}

#endif

extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);

#ifdef CONFIG_SCHED_DEBUG
extern bool sched_debug_enabled;

extern void print_cfs_stats(struct seq_file *m, int cpu);
extern void print_rt_stats(struct seq_file *m, int cpu);
extern void print_dl_stats(struct seq_file *m, int cpu);
extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
#ifdef CONFIG_NUMA_BALANCING
extern void show_numa_stats(struct task_struct *p, struct seq_file *m);
extern void print_numa_stats(struct seq_file *m, int node, unsigned long tsf, unsigned long tpf, unsigned long gsf,
                             unsigned long gpf);
#endif /* CONFIG_NUMA_BALANCING */
#endif /* CONFIG_SCHED_DEBUG */

extern void init_cfs_rq(struct cfs_rq *cfs_rq);
extern void init_rt_rq(struct rt_rq *rt_rq);
extern void init_dl_rq(struct dl_rq *dl_rq);

extern void cfs_bandwidth_usage_inc(void);
extern void cfs_bandwidth_usage_dec(void);

#ifdef CONFIG_NO_HZ_COMMON
#define NOHZ_BALANCE_KICK_BIT 0
#define NOHZ_STATS_KICK_BIT 1

#define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT)
#define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT)

#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK)

#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)

extern void nohz_balance_exit_idle(struct rq *rq);
#else
static inline void nohz_balance_exit_idle(struct rq *rq)
{
}
#endif

#ifdef CONFIG_SMP
static inline void __dl_update(struct dl_bw *dl_b, s64 bw)
{
    struct root_domain *rd = container_of(dl_b, struct root_domain, dl_bw);
    int i;

    RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), "sched RCU must be held");
    for_each_cpu_and(i, rd->span, cpu_active_mask)
    {
        struct rq *rq = cpu_rq(i);

        rq->dl.extra_bw += bw;
    }
}
#else
static inline void __dl_update(struct dl_bw *dl_b, s64 bw)
{
    struct dl_rq *dl = container_of(dl_b, struct dl_rq, dl_bw);

    dl->extra_bw += bw;
}
#endif

#ifdef CONFIG_IRQ_TIME_ACCOUNTING
struct irqtime {
    u64 total;
    u64 tick_delta;
    u64 irq_start_time;
    struct u64_stats_sync sync;
};

DECLARE_PER_CPU(struct irqtime, cpu_irqtime);

/*
 * Returns the irqtime minus the softirq time computed by ksoftirqd.
 * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime
 * and never move forward.
 */
static inline u64 irq_time_read(int cpu)
{
    struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu);
    unsigned int seq;
    u64 total;

    do {
        seq = __u64_stats_fetch_begin(&irqtime->sync);
        total = irqtime->total;
    } while (__u64_stats_fetch_retry(&irqtime->sync, seq));

    return total;
}
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */

#ifdef CONFIG_CPU_FREQ
DECLARE_PER_CPU(struct update_util_data __rcu *, cpufreq_update_util_data);

/**
 * cpufreq_update_util - Take a note about CPU utilization changes.
 * @rq: Runqueue to carry out the update for.
 * @flags: Update reason flags.
 *
 * This function is called by the scheduler on the CPU whose utilization is
 * being updated.
 *
 * It can only be called from RCU-sched read-side critical sections.
 *
 * The way cpufreq is currently arranged requires it to evaluate the CPU
 * performance state (frequency/voltage) on a regular basis to prevent it from
 * being stuck in a completely inadequate performance level for too long.
 * That is not guaranteed to happen if the updates are only triggered from CFS
 * and DL, though, because they may not be coming in if only RT tasks are
 * active all the time (or there are RT tasks only).
 *
 * As a workaround for that issue, this function is called periodically by the
 * RT sched class to trigger extra cpufreq updates to prevent it from stalling,
 * but that really is a band-aid.  Going forward it should be replaced with
 * solutions targeted more specifically at RT tasks.
 */
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
{
    struct update_util_data *data;
    u64 clock;

#ifdef CONFIG_SCHED_WALT
    if (!(flags & SCHED_CPUFREQ_WALT)) {
        return;
    }

    clock = sched_ktime_clock();
#else
    clock = rq_clock(rq);
#endif
    data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data, cpu_of(rq)));
    if (data) {
        data->func(data, clock, flags);
    }
}
#else
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
{
}
#endif /* CONFIG_CPU_FREQ */

#ifdef CONFIG_UCLAMP_TASK
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);

/**
 * uclamp_rq_util_with - clamp @util with @rq and @p effective uclamp values.
 * @rq:        The rq to clamp against. Must not be NULL.
 * @util:    The util value to clamp.
 * @p:        The task to clamp against. Can be NULL if you want to clamp
 *        against @rq only.
 *
 * Clamps the passed @util to the max(@rq, @p) effective uclamp values.
 *
 * If sched_uclamp_used static key is disabled, then just return the util
 * without any clamping since uclamp aggregation at the rq level in the fast
 * path is disabled, rendering this operation a NOP.
 *
 * Use uclamp_eff_value() if you don't care about uclamp values at rq level. It
 * will return the correct effective uclamp value of the task even if the
 * static key is disabled.
 */
static __always_inline unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, struct task_struct *p)
{
    unsigned long min_util = 0;
    unsigned long max_util = 0;

    if (!static_branch_likely(&sched_uclamp_used)) {
        return util;
    }

    if (p) {
        min_util = uclamp_eff_value(p, UCLAMP_MIN);
        max_util = uclamp_eff_value(p, UCLAMP_MAX);

        /*
         * Ignore last runnable task's max clamp, as this task will
         * reset it. Similarly, no need to read the rq's min clamp.
         */
        if (rq->uclamp_flags & UCLAMP_FLAG_IDLE) {
            goto out;
        }
    }

    min_util = max_t(unsigned long, min_util, READ_ONCE(rq->uclamp[UCLAMP_MIN].value));
    max_util = max_t(unsigned long, max_util, READ_ONCE(rq->uclamp[UCLAMP_MAX].value));
out:
    /*
     * Since CPU's {min,max}_util clamps are MAX aggregated considering
     * RUNNABLE tasks with _different_ clamps, we can end up with an
     * inversion. Fix it now when the clamps are applied.
     */
    if (unlikely(min_util >= max_util)) {
        return min_util;
    }

    return clamp(util, min_util, max_util);
}

static inline bool uclamp_boosted(struct task_struct *p)
{
    return uclamp_eff_value(p, UCLAMP_MIN) > 0;
}

/*
 * When uclamp is compiled in, the aggregation at rq level is 'turned off'
 * by default in the fast path and only gets turned on once userspace performs
 * an operation that requires it.
 *
 * Returns true if userspace opted-in to use uclamp and aggregation at rq level
 * hence is active.
 */
static inline bool uclamp_is_used(void)
{
    return static_branch_likely(&sched_uclamp_used);
}
#else  /* CONFIG_UCLAMP_TASK */
static inline unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, struct task_struct *p)
{
    return util;
}

static inline bool uclamp_boosted(struct task_struct *p)
{
    return false;
}

static inline bool uclamp_is_used(void)
{
    return false;
}
#endif /* CONFIG_UCLAMP_TASK */

#ifdef arch_scale_freq_capacity
#ifndef arch_scale_freq_invariant
#define arch_scale_freq_invariant() true
#endif
#else
#define arch_scale_freq_invariant() false
#endif

#ifdef CONFIG_SMP
static inline unsigned long capacity_of(int cpu)
{
    return cpu_rq(cpu)->cpu_capacity;
}

static inline unsigned long capacity_orig_of(int cpu)
{
    return cpu_rq(cpu)->cpu_capacity_orig;
}
#endif

/**
 * enum schedutil_type - CPU utilization type
 * @FREQUENCY_UTIL:    Utilization used to select frequency
 * @ENERGY_UTIL:    Utilization used during energy calculation
 *
 * The utilization signals of all scheduling classes (CFS/RT/DL) and IRQ time
 * need to be aggregated differently depending on the usage made of them. This
 * enum is used within schedutil_freq_util() to differentiate the types of
 * utilization expected by the callers, and adjust the aggregation accordingly.
 */
enum schedutil_type {
    FREQUENCY_UTIL,
    ENERGY_UTIL,
};

#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL

unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs, unsigned long max, enum schedutil_type type,
                                 struct task_struct *p);

static inline unsigned long cpu_bw_dl(struct rq *rq)
{
    return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
}

static inline unsigned long cpu_util_dl(struct rq *rq)
{
    return READ_ONCE(rq->avg_dl.util_avg);
}

static inline unsigned long cpu_util_cfs(struct rq *rq)
{
    unsigned long util = READ_ONCE(rq->cfs.avg.util_avg);

    if (sched_feat(UTIL_EST)) {
        util = max_t(unsigned long, util, READ_ONCE(rq->cfs.avg.util_est.enqueued));
    }

    return util;
}

static inline unsigned long cpu_util_rt(struct rq *rq)
{
    return READ_ONCE(rq->avg_rt.util_avg);
}
#else  /* CONFIG_CPU_FREQ_GOV_SCHEDUTIL */
static inline unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs, unsigned long max,
                                               enum schedutil_type type, struct task_struct *p)
{
    return 0;
}
#endif /* CONFIG_CPU_FREQ_GOV_SCHEDUTIL */

#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
static inline unsigned long cpu_util_irq(struct rq *rq)
{
    return rq->avg_irq.util_avg;
}

static inline unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
    util *= (max - irq);
    util /= max;

    return util;
}
#else
static inline unsigned long cpu_util_irq(struct rq *rq)
{
    return 0;
}

static inline unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
    return util;
}
#endif

#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)

#define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))

DECLARE_STATIC_KEY_FALSE(sched_energy_present);

static inline bool sched_energy_enabled(void)
{
    return static_branch_unlikely(&sched_energy_present);
}

#else /* ! (CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL) */

#define perf_domain_span(pd) NULL
static inline bool sched_energy_enabled(void)
{
    return false;
}

#endif /* CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL */

#ifdef CONFIG_MEMBARRIER
/*
 * The scheduler provides memory barriers required by membarrier between:
 * - prior user-space memory accesses and store to rq->membarrier_state,
 * - store to rq->membarrier_state and following user-space memory accesses.
 * In the same way it provides those guarantees around store to rq->curr.
 */
static inline void membarrier_switch_mm(struct rq *rq, struct mm_struct *prev_mm, struct mm_struct *next_mm)
{
    int membarrier_state;

    if (prev_mm == next_mm) {
        return;
    }

    membarrier_state = atomic_read(&next_mm->membarrier_state);
    if (READ_ONCE(rq->membarrier_state) == membarrier_state) {
        return;
    }

    WRITE_ONCE(rq->membarrier_state, membarrier_state);
}
#else
static inline void membarrier_switch_mm(struct rq *rq, struct mm_struct *prev_mm, struct mm_struct *next_mm)
{
}
#endif

#ifdef CONFIG_SMP
static inline bool is_per_cpu_kthread(struct task_struct *p)
{
    if (!(p->flags & PF_KTHREAD)) {
        return false;
    }

    if (p->nr_cpus_allowed != 1) {
        return false;
    }

    return true;
}
#endif

void swake_up_all_locked(struct swait_queue_head *q);
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);

#ifdef CONFIG_SCHED_RTG
extern bool task_fits_max(struct task_struct *p, int cpu);
extern unsigned long capacity_spare_without(int cpu, struct task_struct *p);
extern int update_preferred_cluster(struct related_thread_group *grp, struct task_struct *p, u32 old_load,
                                    bool from_tick);
extern struct cpumask *find_rtg_target(struct task_struct *p);
#endif

#ifdef CONFIG_SCHED_WALT
static inline int cluster_first_cpu(struct sched_cluster *cluster)
{
    return cpumask_first(&cluster->cpus);
}

extern struct list_head cluster_head;
extern struct sched_cluster *sched_cluster[NR_CPUS];

#define for_each_sched_cluster(cluster) list_for_each_entry_rcu(cluster, &cluster_head, list)

extern struct mutex policy_mutex;
extern unsigned int sched_disable_window_stats;
extern unsigned int max_possible_freq;
extern unsigned int min_max_freq;
extern unsigned int max_possible_efficiency;
extern unsigned int min_possible_efficiency;
extern unsigned int max_capacity;
extern unsigned int min_capacity;
extern unsigned int max_load_scale_factor;
extern unsigned int max_possible_capacity;
extern unsigned int min_max_possible_capacity;
extern unsigned int max_power_cost;
extern unsigned int __read_mostly sched_init_task_load_windows;
extern unsigned int sysctl_sched_restrict_cluster_spill;
extern unsigned int sched_pred_alert_load;
extern struct sched_cluster init_cluster;

static inline void walt_fixup_cum_window_demand(struct rq *rq, s64 scaled_delta)
{
    rq->cum_window_demand_scaled += scaled_delta;
    if (unlikely((s64)rq->cum_window_demand_scaled < 0)) {
        rq->cum_window_demand_scaled = 0;
    }
}

/* Is frequency of two cpus synchronized with each other? */
static inline int same_freq_domain(int src_cpu, int dst_cpu)
{
    struct rq *rq = cpu_rq(src_cpu);

    if (src_cpu == dst_cpu) {
        return 1;
    }

    return cpumask_test_cpu(dst_cpu, &rq->freq_domain_cpumask);
}

extern void reset_task_stats(struct task_struct *p);

#define CPU_RESERVED 1
static inline int is_reserved(int cpu)
{
    struct rq *rq = cpu_rq(cpu);

    return test_bit(CPU_RESERVED, &rq->walt_flags);
}

static inline int mark_reserved(int cpu)
{
    struct rq *rq = cpu_rq(cpu);

    return test_and_set_bit(CPU_RESERVED, &rq->walt_flags);
}

static inline void clear_reserved(int cpu)
{
    struct rq *rq = cpu_rq(cpu);

    clear_bit(CPU_RESERVED, &rq->walt_flags);
}

static inline int cpu_capacity(int cpu)
{
    return cpu_rq(cpu)->cluster->capacity;
}

static inline int cpu_max_possible_capacity(int cpu)
{
    return cpu_rq(cpu)->cluster->max_possible_capacity;
}

static inline int cpu_load_scale_factor(int cpu)
{
    return cpu_rq(cpu)->cluster->load_scale_factor;
}

static inline unsigned int cluster_max_freq(struct sched_cluster *cluster)
{
    /*
     * Governor and thermal driver don't know the other party's mitigation
     * voting. So struct cluster saves both and return min() for current
     * cluster fmax.
     */
    return cluster->max_freq;
}

/* Keep track of max/min capacity possible across CPUs "currently" */
static inline void __update_min_max_capacity(void)
{
    int i;
    int max_cap = 0, min_cap = INT_MAX;

    for_each_possible_cpu(i)
    {
        if (!cpu_active(i)) {
            continue;
        }

        max_cap = max(max_cap, cpu_capacity(i));
        min_cap = min(min_cap, cpu_capacity(i));
    }

    max_capacity = max_cap;
    min_capacity = min_cap;
}

/*
 * Return load_scale_factor of a cpu in reference to "most" efficient cpu, so
 * that "most" efficient cpu gets a load_scale_factor of 1
 */
static inline unsigned long load_scale_cpu_efficiency(struct sched_cluster *cluster)
{
    return DIV_ROUND_UP(CPU_FREQ_1K * max_possible_efficiency, cluster->efficiency);
}

/*
 * Return load_scale_factor of a cpu in reference to cpu with best max_freq
 * (max_possible_freq), so that one with best max_freq gets a load_scale_factor
 * of 1.
 */
static inline unsigned long load_scale_cpu_freq(struct sched_cluster *cluster)
{
    return DIV_ROUND_UP(CPU_FREQ_1K * max_possible_freq, cluster_max_freq(cluster));
}

static inline int compute_load_scale_factor(struct sched_cluster *cluster)
{
    int load_scale = CPU_FREQ_1K;

    /*
     * load_scale_factor accounts for the fact that task load
     * is in reference to "best" performing cpu. Task's load will need to be
     * scaled (up) by a factor to determine suitability to be placed on a
     * (little) cpu.
     */
    load_scale *= load_scale_cpu_efficiency(cluster);
    load_scale >>= 0xa;

    load_scale *= load_scale_cpu_freq(cluster);
    load_scale >>= 0xa;

    return load_scale;
}

static inline bool is_max_capacity_cpu(int cpu)
{
    return cpu_max_possible_capacity(cpu) == max_possible_capacity;
}

static inline bool is_min_capacity_cpu(int cpu)
{
    return cpu_max_possible_capacity(cpu) == min_max_possible_capacity;
}

/*
 * Return 'capacity' of a cpu in reference to "least" efficient cpu, such that
 * least efficient cpu gets capacity of 1024
 */
static unsigned long capacity_scale_cpu_efficiency(struct sched_cluster *cluster)
{
    return (0x400 * cluster->efficiency) / min_possible_efficiency;
}

/*
 * Return 'capacity' of a cpu in reference to cpu with lowest max_freq
 * (min_max_freq), such that one with lowest max_freq gets capacity of 1024.
 */
static unsigned long capacity_scale_cpu_freq(struct sched_cluster *cluster)
{
    return (0x400 * cluster_max_freq(cluster)) / min_max_freq;
}

static inline int compute_capacity(struct sched_cluster *cluster)
{
    int capacity = 0x400;

    capacity *= capacity_scale_cpu_efficiency(cluster);
    capacity >>= 0xa;

    capacity *= capacity_scale_cpu_freq(cluster);
    capacity >>= 0xa;

    return capacity;
}

static inline unsigned int power_cost(int cpu, u64 demand)
{
    return cpu_max_possible_capacity(cpu);
}

static inline unsigned long cpu_util_freq_walt(int cpu)
{
    u64 util;
    struct rq *rq = cpu_rq(cpu);
    unsigned long capacity = capacity_orig_of(cpu);

    if (unlikely(walt_disabled || !sysctl_sched_use_walt_cpu_util)) {
        return cpu_util(cpu);
    }

    util = rq->prev_runnable_sum << SCHED_CAPACITY_SHIFT;
    util = div_u64(util, sched_ravg_window);

    return (util >= capacity) ? capacity : util;
}

static inline bool hmp_capable(void)
{
    return max_possible_capacity != min_max_possible_capacity;
}
#else  /* CONFIG_SCHED_WALT */
static inline void walt_fixup_cum_window_demand(struct rq *rq, s64 scaled_delta)
{
}

static inline int same_freq_domain(int src_cpu, int dst_cpu)
{
    return 1;
}

static inline int is_reserved(int cpu)
{
    return 0;
}

static inline void clear_reserved(int cpu)
{
}

static inline bool hmp_capable(void)
{
    return false;
}
#endif /* CONFIG_SCHED_WALT */

struct sched_avg_stats {
    int nr;
    int nr_misfit;
    int nr_max;
    int nr_scaled;
};
#ifdef CONFIG_SCHED_RUNNING_AVG
extern void sched_get_nr_running_avg(struct sched_avg_stats *stats);
#else
static inline void sched_get_nr_running_avg(struct sched_avg_stats *stats)
{
}
#endif

#ifdef CONFIG_CPU_ISOLATION_OPT
extern int group_balance_cpu_not_isolated(struct sched_group *sg);
#else
static inline int group_balance_cpu_not_isolated(struct sched_group *sg)
{
    return group_balance_cpu(sg);
}
#endif /* CONFIG_CPU_ISOLATION_OPT */

#ifdef CONFIG_HOTPLUG_CPU
extern void migrate_tasks(struct rq *dead_rq, struct rq_flags *rf, bool migrate_pinned_tasks);
#endif
#endif