/* SPDX-License-Identifier: GPL-2.0 */
/*
* workqueue . h - - - work queue handling for Linux .
*/
#ifndef _LINUX_WORKQUEUE_H
#define _LINUX_WORKQUEUE_H
#include <linux/alloc_tag.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>
#include <linux/cpumask_types.h>
#include <linux/rcupdate.h>
#include <linux/workqueue_types.h>
/*
* 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_bits {
WORK_STRUCT_PENDING_BIT = 0 , /* work item is pending execution */
WORK_STRUCT_INACTIVE_BIT, /* work item is inactive */
WORK_STRUCT_PWQ_BIT, /* data points to pwq */
WORK_STRUCT_LINKED_BIT, /* next work is linked to this one */
#ifdef CONFIG_DEBUG_OBJECTS_WORK
WORK_STRUCT_STATIC_BIT, /* static initializer (debugobjects) */
#endif
WORK_STRUCT_FLAG_BITS,
/* color for workqueue flushing */
WORK_STRUCT_COLOR_SHIFT = WORK_STRUCT_FLAG_BITS,
WORK_STRUCT_COLOR_BITS = 4 ,
/*
* When WORK_STRUCT_PWQ is set , reserve 8 bits off of pwq pointer w /
* debugobjects turned off . This makes pwqs aligned to 256 bytes ( 512
* bytes w / DEBUG_OBJECTS_WORK ) and allows 16 workqueue flush colors .
*
* MSB
* [ pwq pointer ] [ flush color ] [ STRUCT flags ]
* 4 bits 4 or 5 bits
*/
WORK_STRUCT_PWQ_SHIFT = WORK_STRUCT_COLOR_SHIFT + WORK_STRUCT_COLOR_BITS,
/*
* data contains off - queue information when ! WORK_STRUCT_PWQ .
*
* MSB
* [ pool ID ] [ disable depth ] [ OFFQ flags ] [ STRUCT flags ]
* 16 bits 1 bit 4 or 5 bits
*/
WORK_OFFQ_FLAG_SHIFT = WORK_STRUCT_FLAG_BITS,
WORK_OFFQ_BH_BIT = WORK_OFFQ_FLAG_SHIFT,
WORK_OFFQ_FLAG_END,
WORK_OFFQ_FLAG_BITS = WORK_OFFQ_FLAG_END - WORK_OFFQ_FLAG_SHIFT,
WORK_OFFQ_DISABLE_SHIFT = WORK_OFFQ_FLAG_SHIFT + WORK_OFFQ_FLAG_BITS,
WORK_OFFQ_DISABLE_BITS = 16 ,
/*
* When a work item is off queue , the high bits encode off - queue flags
* and the last pool it was on . Cap pool ID to 31 bits and use the
* highest number to indicate that no pool is associated .
*/
WORK_OFFQ_POOL_SHIFT = WORK_OFFQ_DISABLE_SHIFT + WORK_OFFQ_DISABLE_BITS,
WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
WORK_OFFQ_POOL_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31 ,
};
enum work_flags {
WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
WORK_STRUCT_INACTIVE = 1 << WORK_STRUCT_INACTIVE_BIT,
WORK_STRUCT_PWQ = 1 << WORK_STRUCT_PWQ_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
};
enum wq_misc_consts {
WORK_NR_COLORS = (1 << WORK_STRUCT_COLOR_BITS),
/* not bound to any CPU, prefer the local CPU */
WORK_CPU_UNBOUND = NR_CPUS,
/* bit mask for work_busy() return values */
WORK_BUSY_PENDING = 1 << 0 ,
WORK_BUSY_RUNNING = 1 << 1 ,
/* maximum string length for set_worker_desc() */
WORKER_DESC_LEN = 32 ,
};
/* Convenience constants - of type 'unsigned long', not 'enum'! */
#define WORK_OFFQ_BH (1 ul << WORK_OFFQ_BH_BIT)
#define WORK_OFFQ_FLAG_MASK (((1 ul << WORK_OFFQ_FLAG_BITS) - 1 ) << WORK_OFFQ_FLAG_SHIFT)
#define WORK_OFFQ_DISABLE_MASK (((1 ul << WORK_OFFQ_DISABLE_BITS) - 1 ) << WORK_OFFQ_DISABLE_SHIFT)
#define WORK_OFFQ_POOL_NONE ((1 ul << WORK_OFFQ_POOL_BITS) - 1 )
#define WORK_STRUCT_NO_POOL (WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT)
#define WORK_STRUCT_PWQ_MASK (~((1 ul << WORK_STRUCT_PWQ_SHIFT) - 1 ))
#define WORK_DATA_INIT() ATOMIC_LONG_INIT((unsigned long )WORK_STRUCT_NO_POOL)
#define WORK_DATA_STATIC_INIT() \
ATOMIC_LONG_INIT((unsigned long )(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC))
struct delayed_work {
struct work_struct work;
struct timer_list timer;
/* target workqueue and CPU ->timer uses to queue ->work */
struct workqueue_struct *wq;
int cpu;
};
struct rcu_work {
struct work_struct work;
struct rcu_head rcu;
/* target workqueue ->rcu uses to queue ->work */
struct workqueue_struct *wq;
};
enum wq_affn_scope {
WQ_AFFN_DFL, /* use system default */
WQ_AFFN_CPU, /* one pod per CPU */
WQ_AFFN_SMT, /* one pod poer SMT */
WQ_AFFN_CACHE, /* one pod per LLC */
WQ_AFFN_NUMA, /* one pod per NUMA node */
WQ_AFFN_SYSTEM, /* one pod across the whole system */
WQ_AFFN_NR_TYPES,
};
/**
* struct workqueue_attrs - A struct for workqueue attributes .
*
* This can be used to change attributes of an unbound workqueue .
*/
struct workqueue_attrs {
/**
* @ nice : nice level
*/
int nice;
/**
* @ cpumask : allowed CPUs
*
* Work items in this workqueue are affine to these CPUs and not allowed
* to execute on other CPUs . A pool serving a workqueue must have the
* same @ cpumask .
*/
cpumask_var_t cpumask;
/**
* @ _ _ pod_cpumask : internal attribute used to create per - pod pools
*
* Internal use only .
*
* Per - pod unbound worker pools are used to improve locality . Always a
* subset of - > cpumask . A workqueue can be associated with multiple
* worker pools with disjoint @ _ _ pod_cpumask ' s . Whether the enforcement
* of a pool ' s @ _ _ pod_cpumask is strict depends on @ affn_strict .
*/
cpumask_var_t __pod_cpumask;
/**
* @ affn_strict : affinity scope is strict
*
* If clear , workqueue will make a best - effort attempt at starting the
* worker inside @ _ _ pod_cpumask but the scheduler is free to migrate it
* outside .
*
* If set , workers are only allowed to run inside @ _ _ pod_cpumask .
*/
bool affn_strict;
/*
* Below fields aren ' t properties of a worker_pool . They only modify how
* : c : func : ` apply_workqueue_attrs ` select pools and thus don ' t
* participate in pool hash calculations or equality comparisons .
*
* If @ affn_strict is set , @ cpumask isn ' t a property of a worker_pool
* either .
*/
/**
* @ affn_scope : unbound CPU affinity scope
*
* CPU pods are used to improve execution locality of unbound work
* items . There are multiple pod types , one for each wq_affn_scope , and
* every CPU in the system belongs to one pod in every pod type . CPUs
* that belong to the same pod share the worker pool . For example ,
* selecting % WQ_AFFN_NUMA makes the workqueue use a separate worker
* pool for each NUMA node .
*/
enum wq_affn_scope affn_scope;
/**
* @ ordered : work items must be executed one by one in queueing order
*/
bool ordered;
};
static inline struct delayed_work *to_delayed_work(struct work_struct *work)
{
return container_of(work, struct delayed_work, work);
}
static inline struct rcu_work *to_rcu_work(struct work_struct *work)
{
return container_of(work, struct rcu_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, tflags) { \
.work = __WORK_INITIALIZER((n).work, (f)), \
.timer = __TIMER_INITIALIZER(delayed_work_timer_fn,\
(tflags) | TIMER_IRQSAFE), \
}
#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, 0 )
#define DECLARE_DEFERRABLE_WORK(n, f) \
struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
#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);
extern void destroy_delayed_work_on_stack(struct delayed_work *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 void destroy_delayed_work_on_stack(struct delayed_work *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_KEY(_work, _func, _onstack, _key) \
do { \
__init_work((_work), _onstack); \
(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
lockdep_init_map(&(_work)->lockdep_map, "(work_completion)" #_ work, (_key), 0 ); \
INIT_LIST_HEAD(&(_work)->entry); \
(_work)->func = (_func); \
} while (0 )
#else
#define __INIT_WORK_KEY(_work, _func, _onstack, _key) \
do { \
__init_work((_work), _onstack); \
(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
INIT_LIST_HEAD(&(_work)->entry); \
(_work)->func = (_func); \
} while (0 )
#endif
#define __INIT_WORK(_work, _func, _onstack) \
do { \
static __maybe_unused struct lock_class_key __key; \
\
__INIT_WORK_KEY(_work, _func, _onstack, &__key); \
} while (0 )
#define INIT_WORK(_work, _func) \
__INIT_WORK((_work), (_func), 0 )
#define INIT_WORK_ONSTACK(_work, _func) \
__INIT_WORK((_work), (_func), 1 )
#define INIT_WORK_ONSTACK_KEY(_work, _func, _key) \
__INIT_WORK_KEY((_work), (_func), 1 , _key)
#define __INIT_DELAYED_WORK(_work, _func, _tflags) \
do { \
INIT_WORK(&(_work)->work, (_func)); \
__timer_init(&(_work)->timer, \
delayed_work_timer_fn, \
(_tflags) | TIMER_IRQSAFE); \
} while (0 )
#define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
do { \
INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
__timer_init_on_stack(&(_work)->timer, \
delayed_work_timer_fn, \
(_tflags) | TIMER_IRQSAFE); \
} while (0 )
#define INIT_DELAYED_WORK(_work, _func) \
__INIT_DELAYED_WORK(_work, _func, 0 )
#define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
__INIT_DELAYED_WORK_ONSTACK(_work, _func, 0 )
#define INIT_DEFERRABLE_WORK(_work, _func) \
__INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
#define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
__INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
#define INIT_RCU_WORK(_work, _func) \
INIT_WORK(&(_work)->work, (_func))
#define INIT_RCU_WORK_ONSTACK(_work, _func) \
INIT_WORK_ONSTACK(&(_work)->work, (_func))
/**
* 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
* @ w : The work item in question
*/
#define delayed_work_pending(w) \
work_pending(&(w)->work)
/*
* Workqueue flags and constants . For details , please refer to
* Documentation / core - api / workqueue . rst .
*/
enum wq_flags {
WQ_BH = 1 << 0 , /* execute in bottom half (softirq) context */
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 intensive workqueue */
WQ_SYSFS = 1 << 6 , /* visible in sysfs, see workqueue_sysfs_register() */
/*
* Per - cpu workqueues are generally preferred because they tend to
* show better performance thanks to cache locality . Per - cpu
* workqueues exclude the scheduler from choosing the CPU to
* execute the worker threads , which has an unfortunate side effect
* of increasing power consumption .
*
* The scheduler considers a CPU idle if it doesn ' t have any task
* to execute and tries to keep idle cores idle to conserve power ;
* however , for example , a per - cpu work item scheduled from an
* interrupt handler on an idle CPU will force the scheduler to
* execute the work item on that CPU breaking the idleness , which in
* turn may lead to more scheduling choices which are sub - optimal
* in terms of power consumption .
*
* Workqueues marked with WQ_POWER_EFFICIENT are per - cpu by default
* but become unbound if workqueue . power_efficient kernel param is
* specified . Per - cpu workqueues which are identified to
* contribute significantly to power - consumption are identified and
* marked with this flag and enabling the power_efficient mode
* leads to noticeable power saving at the cost of small
* performance disadvantage .
*
* http : //thread.gmane.org/gmane.linux.kernel/1480396
*/
WQ_POWER_EFFICIENT = 1 << 7 ,
WQ_PERCPU = 1 << 8 , /* bound to a specific cpu */
__WQ_DESTROYING = 1 << 15 , /* internal: workqueue is destroying */
__WQ_DRAINING = 1 << 16 , /* internal: workqueue is draining */
__WQ_ORDERED = 1 << 17 , /* internal: workqueue is ordered */
__WQ_LEGACY = 1 << 18 , /* internal: create*_workqueue() */
/* BH wq only allows the following flags */
__WQ_BH_ALLOWS = WQ_BH | WQ_HIGHPRI,
};
enum wq_consts {
WQ_MAX_ACTIVE = 2048 , /* I like 2048, better ideas? */
WQ_UNBOUND_MAX_ACTIVE = WQ_MAX_ACTIVE,
WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2 ,
/*
* Per - node default cap on min_active . Unless explicitly set , min_active
* is set to min ( max_active , WQ_DFL_MIN_ACTIVE ) . For more details , see
* workqueue_struct - > min_active definition .
*/
WQ_DFL_MIN_ACTIVE = 8 ,
};
/*
* System - wide workqueues which are always present .
*
* system_percpu_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_highpri_wq is similar to system_wq but for work items which
* require WQ_HIGHPRI .
*
* system_long_wq is similar to system_wq but may host long running
* works . Queue flushing might take relatively long .
*
* system_dfl_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 .
*
* * _ power_efficient_wq are inclined towards saving power and converted
* into WQ_UNBOUND variants if ' wq_power_efficient ' is enabled ; otherwise ,
* they are same as their non - power - efficient counterparts - e . g .
* system_power_efficient_wq is identical to system_wq if
* ' wq_power_efficient ' is disabled . See WQ_POWER_EFFICIENT for more info .
*
* system_bh [ _ highpri ] _ wq are convenience interface to softirq . BH work items
* are executed in the queueing CPU ' s BH context in the queueing order .
*/
extern struct workqueue_struct *system_wq; /* use system_percpu_wq, this will be removed */
extern struct workqueue_struct *system_percpu_wq;
extern struct workqueue_struct *system_highpri_wq;
extern struct workqueue_struct *system_long_wq;
extern struct workqueue_struct *system_unbound_wq;
extern struct workqueue_struct *system_dfl_wq;
extern struct workqueue_struct *system_freezable_wq;
extern struct workqueue_struct *system_power_efficient_wq;
extern struct workqueue_struct *system_freezable_power_efficient_wq;
extern struct workqueue_struct *system_bh_wq;
extern struct workqueue_struct *system_bh_highpri_wq;
void workqueue_softirq_action(bool highpri);
void workqueue_softirq_dead(unsigned int cpu);
/**
* 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 for @ fmt
*
* For a per - cpu workqueue , @ max_active limits the number of in - flight work
* items for each CPU . e . g . @ max_active of 1 indicates that each CPU can be
* executing at most one work item for the workqueue .
*
* For unbound workqueues , @ max_active limits the number of in - flight work items
* for the whole system . e . g . @ max_active of 16 indicates that there can be
* at most 16 work items executing for the workqueue in the whole system .
*
* As sharing the same active counter for an unbound workqueue across multiple
* NUMA nodes can be expensive , @ max_active is distributed to each NUMA node
* according to the proportion of the number of online CPUs and enforced
* independently .
*
* Depending on online CPU distribution , a node may end up with per - node
* max_active which is significantly lower than @ max_active , which can lead to
* deadlocks if the per - node concurrency limit is lower than the maximum number
* of interdependent work items for the workqueue .
*
* To guarantee forward progress regardless of online CPU distribution , the
* concurrency limit on every node is guaranteed to be equal to or greater than
* min_active which is set to min ( @ max_active , % WQ_DFL_MIN_ACTIVE ) . This means
* that the sum of per - node max_active ' s may be larger than @ max_active .
*
* For detailed information on % WQ_ * flags , please refer to
* Documentation / core - api / workqueue . rst .
*
* RETURNS :
* Pointer to the allocated workqueue on success , % NULL on failure .
*/
__printf(1 , 4 ) struct workqueue_struct *
alloc_workqueue_noprof(const char *fmt, unsigned int flags, int max_active, ...);
#define alloc_workqueue(...) alloc_hooks(alloc_workqueue_noprof(__VA_ARGS__))
#ifdef CONFIG_LOCKDEP
/**
* alloc_workqueue_lockdep_map - allocate a workqueue with user - defined lockdep_map
* @ fmt : printf format for the name of the workqueue
* @ flags : WQ_ * flags
* @ max_active : max in - flight work items , 0 for default
* @ lockdep_map : user - defined lockdep_map
* @ . . . : args for @ fmt
*
* Same as alloc_workqueue but with the a user - define lockdep_map . Useful for
* workqueues created with the same purpose and to avoid leaking a lockdep_map
* on each workqueue creation .
*
* RETURNS :
* Pointer to the allocated workqueue on success , % NULL on failure .
*/
__printf(1 , 5 ) struct workqueue_struct *
alloc_workqueue_lockdep_map(const char *fmt, unsigned int flags, int max_active,
struct lockdep_map *lockdep_map, ...);
/**
* alloc_ordered_workqueue_lockdep_map - allocate an ordered workqueue with
* user - defined lockdep_map
*
* @ fmt : printf format for the name of the workqueue
* @ flags : WQ_ * flags ( only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful )
* @ lockdep_map : user - defined lockdep_map
* @ args : args for @ fmt
*
* Same as alloc_ordered_workqueue but with the a user - define lockdep_map .
* Useful for workqueues created with the same purpose and to avoid leaking a
* lockdep_map on each workqueue creation .
*
* RETURNS :
* Pointer to the allocated workqueue on success , % NULL on failure .
*/
#define alloc_ordered_workqueue_lockdep_map(fmt, flags, lockdep_map, args...) \
alloc_hooks(alloc_workqueue_lockdep_map(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags),\
1 , lockdep_map, ## 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 | __WQ_ORDERED | (flags), 1 , ## args)
#define create_workqueue(name) \
alloc_workqueue("%s" , __WQ_LEGACY | WQ_MEM_RECLAIM, 1 , (name))
#define create_freezable_workqueue(name) \
alloc_workqueue("%s" , __WQ_LEGACY | WQ_FREEZABLE | WQ_UNBOUND | \
WQ_MEM_RECLAIM, 1 , (name))
#define create_singlethread_workqueue(name) \
alloc_ordered_workqueue("%s" , __WQ_LEGACY | WQ_MEM_RECLAIM, name)
#define from_work(var, callback_work, work_fieldname) \
container_of(callback_work, typeof(*var), work_fieldname)
extern void destroy_workqueue(struct workqueue_struct *wq);
struct workqueue_attrs *alloc_workqueue_attrs_noprof(void );
#define alloc_workqueue_attrs(...) alloc_hooks(alloc_workqueue_attrs_noprof(__VA_ARGS__))
void free_workqueue_attrs(struct workqueue_attrs *attrs);
int apply_workqueue_attrs(struct workqueue_struct *wq,
const struct workqueue_attrs *attrs);
extern int workqueue_unbound_exclude_cpumask(cpumask_var_t cpumask);
extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work);
extern bool queue_work_node(int node, struct workqueue_struct *wq,
struct work_struct *work);
extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct delayed_work *work, unsigned long delay);
extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct delayed_work *dwork, unsigned long delay);
extern bool queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork);
extern void __flush_workqueue(struct workqueue_struct *wq);
extern void drain_workqueue(struct workqueue_struct *wq);
extern int schedule_on_each_cpu(work_func_t func);
int execute_in_process_context(work_func_t fn, struct execute_work *);
extern bool flush_work(struct work_struct *work);
extern bool cancel_work(struct work_struct *work);
extern bool cancel_work_sync(struct work_struct *work);
extern bool flush_delayed_work(struct delayed_work *dwork);
extern bool cancel_delayed_work(struct delayed_work *dwork);
extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
extern bool disable_work(struct work_struct *work);
extern bool disable_work_sync(struct work_struct *work);
extern bool enable_work(struct work_struct *work);
extern bool disable_delayed_work(struct delayed_work *dwork);
extern bool disable_delayed_work_sync(struct delayed_work *dwork);
extern bool enable_delayed_work(struct delayed_work *dwork);
extern bool flush_rcu_work(struct rcu_work *rwork);
extern void workqueue_set_max_active(struct workqueue_struct *wq,
int max_active);
extern void workqueue_set_min_active(struct workqueue_struct *wq,
int min_active);
extern struct work_struct *current_work(void );
extern bool current_is_workqueue_rescuer(void );
extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
extern unsigned int work_busy(struct work_struct *work);
extern __printf(1 , 2 ) void set_worker_desc(const char *fmt, ...);
extern void print_worker_info(const char *log_lvl, struct task_struct *task);
extern void show_all_workqueues(void );
extern void show_freezable_workqueues(void );
extern void show_one_workqueue(struct workqueue_struct *wq);
extern void wq_worker_comm(char *buf, size_t size, struct task_struct *task);
/**
* queue_work - queue work on a workqueue
* @ wq : workqueue to use
* @ work : work to queue
*
* Returns % false if @ work was already on a queue , % true otherwise .
*
* We queue the work to the CPU on which it was submitted , but if the CPU dies
* it can be processed by another CPU .
*
* Memory - ordering properties : If it returns % true , guarantees that all stores
* preceding the call to queue_work ( ) in the program order will be visible from
* the CPU which will execute @ work by the time such work executes , e . g . ,
*
* { x is initially 0 }
*
* CPU0 CPU1
*
* WRITE_ONCE ( x , 1 ) ; [ @ work is being executed ]
* r0 = queue_work ( wq , work ) ; r1 = READ_ONCE ( x ) ;
*
* Forbids : r0 = = true & & r1 = = 0
*/
static inline bool queue_work(struct workqueue_struct *wq,
struct work_struct *work)
{
return queue_work_on(WORK_CPU_UNBOUND, wq, work);
}
/**
* queue_delayed_work - queue work on a workqueue after delay
* @ wq : workqueue to use
* @ dwork : delayable work to queue
* @ delay : number of jiffies to wait before queueing
*
* Equivalent to queue_delayed_work_on ( ) but tries to use the local CPU .
*/
static inline bool queue_delayed_work(struct workqueue_struct *wq,
struct delayed_work *dwork,
unsigned long delay)
{
return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
}
/**
* mod_delayed_work - modify delay of or queue a delayed work
* @ wq : workqueue to use
* @ dwork : work to queue
* @ delay : number of jiffies to wait before queueing
*
* mod_delayed_work_on ( ) on local CPU .
*/
static inline bool mod_delayed_work(struct workqueue_struct *wq,
struct delayed_work *dwork,
unsigned long delay)
{
return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
}
/**
* schedule_work_on - put work task on a specific cpu
* @ cpu : cpu to put the work task on
* @ work : job to be done
*
* This puts a job on a specific cpu
*/
static inline bool schedule_work_on(int cpu, struct work_struct *work)
{
return queue_work_on(cpu, system_wq, work);
}
/**
* schedule_work - put work task in global workqueue
* @ work : job to be done
*
* Returns % false if @ work was already on the kernel - global workqueue and
* % true otherwise .
*
* This puts a job in the kernel - global workqueue if it was not already
* queued and leaves it in the same position on the kernel - global
* workqueue otherwise .
*
* Shares the same memory - ordering properties of queue_work ( ) , cf . the
* DocBook header of queue_work ( ) .
*/
static inline bool schedule_work(struct work_struct *work)
{
return queue_work(system_wq, work);
}
/**
* enable_and_queue_work - Enable and queue a work item on a specific workqueue
* @ wq : The target workqueue
* @ work : The work item to be enabled and queued
*
* This function combines the operations of enable_work ( ) and queue_work ( ) ,
* providing a convenient way to enable and queue a work item in a single call .
* It invokes enable_work ( ) on @ work and then queues it if the disable depth
* reached 0 . Returns % true if the disable depth reached 0 and @ work is queued ,
* and % false otherwise .
*
* Note that @ work is always queued when disable depth reaches zero . If the
* desired behavior is queueing only if certain events took place while @ work is
* disabled , the user should implement the necessary state tracking and perform
* explicit conditional queueing after enable_work ( ) .
*/
static inline bool enable_and_queue_work(struct workqueue_struct *wq,
struct work_struct *work)
{
if (enable_work(work)) {
queue_work(wq, work);
return true ;
}
return false ;
}
/*
* Detect attempt to flush system - wide workqueues at compile time when possible .
* Warn attempt to flush system - wide workqueues at runtime .
*
* See https : //lkml.kernel.org/r/49925af7-78a8-a3dd-bce6-cfc02e1a9236@I-love.SAKURA.ne.jp
* for reasons and steps for converting system - wide workqueues into local workqueues .
*/
extern void __warn_flushing_systemwide_wq(void )
__compiletime_warning("Please avoid flushing system-wide workqueues." );
/* Please stop using this function, for this function will be removed in near future. */
#define flush_scheduled_work() \
({ \
__warn_flushing_systemwide_wq(); \
__flush_workqueue(system_wq); \
})
#define flush_workqueue(wq) \
({ \
struct workqueue_struct *_wq = (wq); \
\
if ((__builtin_constant_p(_wq == system_wq) && \
_wq == system_wq) || \
(__builtin_constant_p(_wq == system_highpri_wq) && \
_wq == system_highpri_wq) || \
(__builtin_constant_p(_wq == system_long_wq) && \
_wq == system_long_wq) || \
(__builtin_constant_p(_wq == system_unbound_wq) && \
_wq == system_unbound_wq) || \
(__builtin_constant_p(_wq == system_freezable_wq) && \
_wq == system_freezable_wq) || \
(__builtin_constant_p(_wq == system_power_efficient_wq) && \
_wq == system_power_efficient_wq) || \
(__builtin_constant_p(_wq == system_freezable_power_efficient_wq) && \
_wq == system_freezable_power_efficient_wq)) \
__warn_flushing_systemwide_wq(); \
__flush_workqueue(_wq); \
})
/**
* schedule_delayed_work_on - queue work in global workqueue on CPU after delay
* @ cpu : cpu to use
* @ dwork : job to be done
* @ delay : number of jiffies to wait
*
* After waiting for a given time this puts a job in the kernel - global
* workqueue on the specified CPU .
*/
static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
unsigned long delay)
{
return queue_delayed_work_on(cpu, system_wq, dwork, delay);
}
/**
* schedule_delayed_work - put work task in global workqueue after delay
* @ dwork : job to be done
* @ delay : number of jiffies to wait or 0 for immediate execution
*
* After waiting for a given time this puts a job in the kernel - global
* workqueue .
*/
static inline bool schedule_delayed_work(struct delayed_work *dwork,
unsigned long delay)
{
return queue_delayed_work(system_wq, dwork, delay);
}
#ifndef CONFIG_SMP
static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
{
return fn(arg);
}
static inline long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg)
{
return fn(arg);
}
#else
long work_on_cpu_key(int cpu, long (*fn)(void *),
void *arg, struct lock_class_key *key);
/*
* A new key is defined for each caller to make sure the work
* associated with the function doesn ' t share its locking class .
*/
#define work_on_cpu(_cpu, _fn, _arg) \
({ \
static struct lock_class_key __key; \
\
work_on_cpu_key(_cpu, _fn, _arg, &__key); \
})
#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 */
#ifdef CONFIG_SYSFS
int workqueue_sysfs_register(struct workqueue_struct *wq);
#else /* CONFIG_SYSFS */
static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
{ return 0 ; }
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_WQ_WATCHDOG
void wq_watchdog_touch(int cpu);
#else /* CONFIG_WQ_WATCHDOG */
static inline void wq_watchdog_touch(int cpu) { }
#endif /* CONFIG_WQ_WATCHDOG */
#ifdef CONFIG_SMP
int workqueue_prepare_cpu(unsigned int cpu);
int workqueue_online_cpu(unsigned int cpu);
int workqueue_offline_cpu(unsigned int cpu);
#endif
void __init workqueue_init_early(void );
void __init workqueue_init(void );
void __init workqueue_init_topology(void );
#endif
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