/*
 * workqueue.h --- work queue handling for Linux.
 */

#ifndef _LINUX_WORKQUEUE_H
#define _LINUX_WORKQUEUE_H

#include <linux/timer.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
#include <linux/lockdep.h>
#include <linux/threads.h>
#include <linux/atomic.h>

struct workqueue_struct;

struct work_struct;
typedef void (*work_func_t)(struct work_struct *work);

/*
 * The first word is the work queue pointer and the flags rolled into
 * one
 */
#define work_data_bits(work) ((unsigned long *)(&(work)->data))

enum {
        WORK_STRUCT_PENDING_BIT = 0,    /* work item is pending execution */
        WORK_STRUCT_DELAYED_BIT = 1,    /* work item is delayed */
        WORK_STRUCT_CWQ_BIT     = 2,    /* data points to cwq */
        WORK_STRUCT_LINKED_BIT  = 3,    /* next work is linked to this one */
#ifdef CONFIG_DEBUG_OBJECTS_WORK
        WORK_STRUCT_STATIC_BIT  = 4,    /* static initializer (debugobjects) */
        WORK_STRUCT_COLOR_SHIFT = 5,    /* color for workqueue flushing */
#else
        WORK_STRUCT_COLOR_SHIFT = 4,    /* color for workqueue flushing */
#endif

        WORK_STRUCT_COLOR_BITS  = 4,

        WORK_STRUCT_PENDING     = 1 << WORK_STRUCT_PENDING_BIT,
        WORK_STRUCT_DELAYED     = 1 << WORK_STRUCT_DELAYED_BIT,
        WORK_STRUCT_CWQ         = 1 << WORK_STRUCT_CWQ_BIT,
        WORK_STRUCT_LINKED      = 1 << WORK_STRUCT_LINKED_BIT,
#ifdef CONFIG_DEBUG_OBJECTS_WORK
        WORK_STRUCT_STATIC      = 1 << WORK_STRUCT_STATIC_BIT,
#else
        WORK_STRUCT_STATIC      = 0,
#endif

        /*
         * The last color is no color used for works which don't
         * participate in workqueue flushing.
         */
        WORK_NR_COLORS          = (1 << WORK_STRUCT_COLOR_BITS) - 1,
        WORK_NO_COLOR           = WORK_NR_COLORS,

        /* special cpu IDs */
        WORK_CPU_UNBOUND        = NR_CPUS,
        WORK_CPU_NONE           = NR_CPUS + 1,
        WORK_CPU_LAST           = WORK_CPU_NONE,

        /*
         * Reserve 7 bits off of cwq pointer w/ debugobjects turned
         * off.  This makes cwqs aligned to 256 bytes and allows 15
         * workqueue flush colors.
         */
        WORK_STRUCT_FLAG_BITS   = WORK_STRUCT_COLOR_SHIFT +
                                  WORK_STRUCT_COLOR_BITS,

        WORK_STRUCT_FLAG_MASK   = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
        WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
        WORK_STRUCT_NO_CPU      = WORK_CPU_NONE << WORK_STRUCT_FLAG_BITS,

        /* bit mask for work_busy() return values */
        WORK_BUSY_PENDING       = 1 << 0,
        WORK_BUSY_RUNNING       = 1 << 1,
};

struct work_struct {
        atomic_long_t data;
        struct list_head entry;
        work_func_t func;
#ifdef CONFIG_LOCKDEP
        struct lockdep_map lockdep_map;
#endif
};

#define WORK_DATA_INIT()        ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU)
#define WORK_DATA_STATIC_INIT() \
        ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU | WORK_STRUCT_STATIC)

struct delayed_work {
        struct work_struct work;
        struct timer_list timer;
};

static inline struct delayed_work *to_delayed_work(struct work_struct *work)
{
        return container_of(work, struct delayed_work, work);
}

struct execute_work {
        struct work_struct work;
};

#ifdef CONFIG_LOCKDEP
/*
 * NB: because we have to copy the lockdep_map, setting _key
 * here is required, otherwise it could get initialised to the
 * copy of the lockdep_map!
 */
#define __WORK_INIT_LOCKDEP_MAP(n, k) \
        .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
#else
#define __WORK_INIT_LOCKDEP_MAP(n, k)
#endif

#define __WORK_INITIALIZER(n, f) {                              \
        .data = WORK_DATA_STATIC_INIT(),                        \
        .entry  = { &(n).entry, &(n).entry },                   \
        .func = (f),                                            \
        __WORK_INIT_LOCKDEP_MAP(#n, &(n))                       \
        }

#define __DELAYED_WORK_INITIALIZER(n, f) {                      \
        .work = __WORK_INITIALIZER((n).work, (f)),              \
        .timer = TIMER_INITIALIZER(NULL, 0, 0),                 \
        }

#define __DEFERRED_WORK_INITIALIZER(n, f) {                     \
        .work = __WORK_INITIALIZER((n).work, (f)),              \
        .timer = TIMER_DEFERRED_INITIALIZER(NULL, 0, 0),        \
        }

#define DECLARE_WORK(n, f)                                      \
        struct work_struct n = __WORK_INITIALIZER(n, f)

#define DECLARE_DELAYED_WORK(n, f)                              \
        struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)

#define DECLARE_DEFERRED_WORK(n, f)                             \
        struct delayed_work n = __DEFERRED_WORK_INITIALIZER(n, f)

/*
 * initialize a work item's function pointer
 */
#define PREPARE_WORK(_work, _func)                              \
        do {                                                    \
                (_work)->func = (_func);                        \
        } while (0)

#define PREPARE_DELAYED_WORK(_work, _func)                      \
        PREPARE_WORK(&(_work)->work, (_func))

#ifdef CONFIG_DEBUG_OBJECTS_WORK
extern void __init_work(struct work_struct *work, int onstack);
extern void destroy_work_on_stack(struct work_struct *work);
static inline unsigned int work_static(struct work_struct *work)
{
        return *work_data_bits(work) & WORK_STRUCT_STATIC;
}
#else
static inline void __init_work(struct work_struct *work, int onstack) { }
static inline void destroy_work_on_stack(struct work_struct *work) { }
static inline unsigned int work_static(struct work_struct *work) { return 0; }
#endif

/*
 * initialize all of a work item in one go
 *
 * NOTE! No point in using "atomic_long_set()": using a direct
 * assignment of the work data initializer allows the compiler
 * to generate better code.
 */
#ifdef CONFIG_LOCKDEP
#define __INIT_WORK(_work, _func, _onstack)                             \
        do {                                                            \
                static struct lock_class_key __key;                     \
                                                                        \
                __init_work((_work), _onstack);                         \
                (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \
                lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\
                INIT_LIST_HEAD(&(_work)->entry);                        \
                PREPARE_WORK((_work), (_func));                         \
        } while (0)
#else
#define __INIT_WORK(_work, _func, _onstack)                             \
        do {                                                            \
                __init_work((_work), _onstack);                         \
                (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \
                INIT_LIST_HEAD(&(_work)->entry);                        \
                PREPARE_WORK((_work), (_func));                         \
        } while (0)
#endif

#define INIT_WORK(_work, _func)                                 \
        do {                                                    \
                __INIT_WORK((_work), (_func), 0);               \
        } while (0)

#define INIT_WORK_ONSTACK(_work, _func)                         \
        do {                                                    \
                __INIT_WORK((_work), (_func), 1);               \
        } while (0)

#define INIT_DELAYED_WORK(_work, _func)                         \
        do {                                                    \
                INIT_WORK(&(_work)->work, (_func));             \
                init_timer(&(_work)->timer);                    \
        } while (0)

#define INIT_DELAYED_WORK_ONSTACK(_work, _func)                 \
        do {                                                    \
                INIT_WORK_ONSTACK(&(_work)->work, (_func));     \
                init_timer_on_stack(&(_work)->timer);           \
        } while (0)

#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func)              \
        do {                                                    \
                INIT_WORK(&(_work)->work, (_func));             \
                init_timer_deferrable(&(_work)->timer);         \
        } while (0)

/**
 * work_pending - Find out whether a work item is currently pending
 * @work: The work item in question
 */
#define work_pending(work) \
        test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))

/**
 * delayed_work_pending - Find out whether a delayable work item is currently
 * pending
 * @work: The work item in question
 */
#define delayed_work_pending(w) \
        work_pending(&(w)->work)

/**
 * work_clear_pending - for internal use only, mark a work item as not pending
 * @work: The work item in question
 */
#define work_clear_pending(work) \
        clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))

/*
 * Workqueue flags and constants.  For details, please refer to
 * Documentation/workqueue.txt.
 */
enum {
        WQ_NON_REENTRANT        = 1 << 0, /* guarantee non-reentrance */
        WQ_UNBOUND              = 1 << 1, /* not bound to any cpu */
        WQ_FREEZABLE            = 1 << 2, /* freeze during suspend */
        WQ_MEM_RECLAIM          = 1 << 3, /* may be used for memory reclaim */
        WQ_HIGHPRI              = 1 << 4, /* high priority */
        WQ_CPU_INTENSIVE        = 1 << 5, /* cpu instensive workqueue */

        WQ_DRAINING             = 1 << 6, /* internal: workqueue is draining */
        WQ_RESCUER              = 1 << 7, /* internal: workqueue has rescuer */

        WQ_MAX_ACTIVE           = 512,    /* I like 512, better ideas? */
        WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4 * #cpus for unbound wq */
        WQ_DFL_ACTIVE           = WQ_MAX_ACTIVE / 2,
};

/* unbound wq's aren't per-cpu, scale max_active according to #cpus */
#define WQ_UNBOUND_MAX_ACTIVE   \
        max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)

/*
 * System-wide workqueues which are always present.
 *
 * system_wq is the one used by schedule[_delayed]_work[_on]().
 * Multi-CPU multi-threaded.  There are users which expect relatively
 * short queue flush time.  Don't queue works which can run for too
 * long.
 *
 * system_long_wq is similar to system_wq but may host long running
 * works.  Queue flushing might take relatively long.
 *
 * system_nrt_wq is non-reentrant and guarantees that any given work
 * item is never executed in parallel by multiple CPUs.  Queue
 * flushing might take relatively long.
 *
 * system_unbound_wq is unbound workqueue.  Workers are not bound to
 * any specific CPU, not concurrency managed, and all queued works are
 * executed immediately as long as max_active limit is not reached and
 * resources are available.
 *
 * system_freezable_wq is equivalent to system_wq except that it's
 * freezable.
 *
 * system_nrt_freezable_wq is equivalent to system_nrt_wq except that
 * it's freezable.
 */
extern struct workqueue_struct *system_wq;
extern struct workqueue_struct *system_long_wq;
extern struct workqueue_struct *system_nrt_wq;
extern struct workqueue_struct *system_unbound_wq;
extern struct workqueue_struct *system_freezable_wq;
extern struct workqueue_struct *system_nrt_freezable_wq;

extern struct workqueue_struct *
__alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
        struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);

/**
 * alloc_workqueue - allocate a workqueue
 * @fmt: printf format for the name of the workqueue
 * @flags: WQ_* flags
 * @max_active: max in-flight work items, 0 for default
 * @args: args for @fmt
 *
 * Allocate a workqueue with the specified parameters.  For detailed
 * information on WQ_* flags, please refer to Documentation/workqueue.txt.
 *
 * The __lock_name macro dance is to guarantee that single lock_class_key
 * doesn't end up with different namesm, which isn't allowed by lockdep.
 *
 * RETURNS:
 * Pointer to the allocated workqueue on success, %NULL on failure.
 */
#ifdef CONFIG_LOCKDEP
#define alloc_workqueue(fmt, flags, max_active, args...)        \
({                                                              \
        static struct lock_class_key __key;                     \
        const char *__lock_name;                                \
                                                                \
        if (__builtin_constant_p(fmt))                          \
                __lock_name = (fmt);                            \
        else                                                    \
                __lock_name = #fmt;                             \
                                                                \
        __alloc_workqueue_key((fmt), (flags), (max_active),     \
                              &__key, __lock_name, ##args);     \
})
#else
#define alloc_workqueue(fmt, flags, max_active, args...)        \
        __alloc_workqueue_key((fmt), (flags), (max_active),     \
                              NULL, NULL, ##args)
#endif

/**
 * alloc_ordered_workqueue - allocate an ordered workqueue
 * @fmt: printf format for the name of the workqueue
 * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
 * @args: args for @fmt
 *
 * Allocate an ordered workqueue.  An ordered workqueue executes at
 * most one work item at any given time in the queued order.  They are
 * implemented as unbound workqueues with @max_active of one.
 *
 * RETURNS:
 * Pointer to the allocated workqueue on success, %NULL on failure.
 */
#define alloc_ordered_workqueue(fmt, flags, args...)            \
        alloc_workqueue(fmt, WQ_UNBOUND | (flags), 1, ##args)

#define create_workqueue(name)                                  \
        alloc_workqueue((name), WQ_MEM_RECLAIM, 1)
#define create_freezable_workqueue(name)                        \
        alloc_workqueue((name), WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, 1)
#define create_singlethread_workqueue(name)                     \
        alloc_workqueue((name), WQ_UNBOUND | WQ_MEM_RECLAIM, 1)

extern void destroy_workqueue(struct workqueue_struct *wq);

extern int queue_work(struct workqueue_struct *wq, struct work_struct *work);
extern int queue_work_on(int cpu, struct workqueue_struct *wq,
                        struct work_struct *work);
extern int queue_delayed_work(struct workqueue_struct *wq,
                        struct delayed_work *work, unsigned long delay);
extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
                        struct delayed_work *work, unsigned long delay);

extern void flush_workqueue(struct workqueue_struct *wq);
extern void drain_workqueue(struct workqueue_struct *wq);
extern void flush_scheduled_work(void);

extern int schedule_work(struct work_struct *work);
extern int schedule_work_on(int cpu, struct work_struct *work);
extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay);
extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,
                                        unsigned long delay);
extern int schedule_on_each_cpu(work_func_t func);
extern int keventd_up(void);

int execute_in_process_context(work_func_t fn, struct execute_work *);

extern bool flush_work(struct work_struct *work);
extern bool flush_work_sync(struct work_struct *work);
extern bool cancel_work_sync(struct work_struct *work);

extern bool flush_delayed_work(struct delayed_work *dwork);
extern bool flush_delayed_work_sync(struct delayed_work *work);
extern bool cancel_delayed_work_sync(struct delayed_work *dwork);

extern void workqueue_set_max_active(struct workqueue_struct *wq,
                                     int max_active);
extern bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq);
extern unsigned int work_cpu(struct work_struct *work);
extern unsigned int work_busy(struct work_struct *work);

/*
 * Kill off a pending schedule_delayed_work().  Note that the work callback
 * function may still be running on return from cancel_delayed_work(), unless
 * it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or
 * cancel_work_sync() to wait on it.
 */
static inline bool cancel_delayed_work(struct delayed_work *work)
{
        bool ret;

        ret = del_timer_sync(&work->timer);
        if (ret)
                work_clear_pending(&work->work);
        return ret;
}

/*
 * Like above, but uses del_timer() instead of del_timer_sync(). This means,
 * if it returns 0 the timer function may be running and the queueing is in
 * progress.
 */
static inline bool __cancel_delayed_work(struct delayed_work *work)
{
        bool ret;

        ret = del_timer(&work->timer);
        if (ret)
                work_clear_pending(&work->work);
        return ret;
}

#ifndef CONFIG_SMP
static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
{
        return fn(arg);
}
#else
long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
#endif /* CONFIG_SMP */

#ifdef CONFIG_FREEZER
extern void freeze_workqueues_begin(void);
extern bool freeze_workqueues_busy(void);
extern void thaw_workqueues(void);
#endif /* CONFIG_FREEZER */

#endif