213 lines
6.6 KiB
C
213 lines
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KTHREAD_H
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#define _LINUX_KTHREAD_H
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/* Simple interface for creating and stopping kernel threads without mess. */
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/cgroup.h>
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__printf(4, 5)
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struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
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void *data,
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int node,
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const char namefmt[], ...);
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/**
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* kthread_create - create a kthread on the current node
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* @threadfn: the function to run in the thread
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* @data: data pointer for @threadfn()
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* @namefmt: printf-style format string for the thread name
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* @arg...: arguments for @namefmt.
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*
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* This macro will create a kthread on the current node, leaving it in
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* the stopped state. This is just a helper for kthread_create_on_node();
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* see the documentation there for more details.
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*/
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#define kthread_create(threadfn, data, namefmt, arg...) \
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kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg)
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struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
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void *data,
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unsigned int cpu,
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const char *namefmt);
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/**
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* kthread_run - create and wake a thread.
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* @threadfn: the function to run until signal_pending(current).
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* @data: data ptr for @threadfn.
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* @namefmt: printf-style name for the thread.
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*
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* Description: Convenient wrapper for kthread_create() followed by
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* wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM).
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*/
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#define kthread_run(threadfn, data, namefmt, ...) \
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({ \
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struct task_struct *__k \
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= kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
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if (!IS_ERR(__k)) \
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wake_up_process(__k); \
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__k; \
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})
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void free_kthread_struct(struct task_struct *k);
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void kthread_bind(struct task_struct *k, unsigned int cpu);
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void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);
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int kthread_stop(struct task_struct *k);
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bool kthread_should_stop(void);
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bool kthread_should_park(void);
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bool kthread_freezable_should_stop(bool *was_frozen);
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void *kthread_data(struct task_struct *k);
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void *kthread_probe_data(struct task_struct *k);
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int kthread_park(struct task_struct *k);
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void kthread_unpark(struct task_struct *k);
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void kthread_parkme(void);
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void kthread_park_complete(struct task_struct *k);
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int kthreadd(void *unused);
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extern struct task_struct *kthreadd_task;
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extern int tsk_fork_get_node(struct task_struct *tsk);
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/*
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* Simple work processor based on kthread.
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*
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* This provides easier way to make use of kthreads. A kthread_work
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* can be queued and flushed using queue/kthread_flush_work()
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* respectively. Queued kthread_works are processed by a kthread
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* running kthread_worker_fn().
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*/
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struct kthread_work;
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typedef void (*kthread_work_func_t)(struct kthread_work *work);
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void kthread_delayed_work_timer_fn(struct timer_list *t);
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enum {
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KTW_FREEZABLE = 1 << 0, /* freeze during suspend */
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};
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struct kthread_worker {
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unsigned int flags;
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spinlock_t lock;
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struct list_head work_list;
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struct list_head delayed_work_list;
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struct task_struct *task;
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struct kthread_work *current_work;
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};
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struct kthread_work {
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struct list_head node;
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kthread_work_func_t func;
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struct kthread_worker *worker;
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/* Number of canceling calls that are running at the moment. */
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int canceling;
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};
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struct kthread_delayed_work {
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struct kthread_work work;
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struct timer_list timer;
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};
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#define KTHREAD_WORKER_INIT(worker) { \
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.lock = __SPIN_LOCK_UNLOCKED((worker).lock), \
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.work_list = LIST_HEAD_INIT((worker).work_list), \
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.delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
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}
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#define KTHREAD_WORK_INIT(work, fn) { \
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.node = LIST_HEAD_INIT((work).node), \
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.func = (fn), \
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}
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#define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \
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.work = KTHREAD_WORK_INIT((dwork).work, (fn)), \
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.timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn,\
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TIMER_IRQSAFE), \
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}
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#define DEFINE_KTHREAD_WORKER(worker) \
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struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
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#define DEFINE_KTHREAD_WORK(work, fn) \
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struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
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#define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \
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struct kthread_delayed_work dwork = \
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KTHREAD_DELAYED_WORK_INIT(dwork, fn)
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/*
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* kthread_worker.lock needs its own lockdep class key when defined on
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* stack with lockdep enabled. Use the following macros in such cases.
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*/
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#ifdef CONFIG_LOCKDEP
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# define KTHREAD_WORKER_INIT_ONSTACK(worker) \
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({ kthread_init_worker(&worker); worker; })
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# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \
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struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
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#else
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# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
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#endif
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extern void __kthread_init_worker(struct kthread_worker *worker,
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const char *name, struct lock_class_key *key);
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#define kthread_init_worker(worker) \
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do { \
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static struct lock_class_key __key; \
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__kthread_init_worker((worker), "("#worker")->lock", &__key); \
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} while (0)
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#define kthread_init_work(work, fn) \
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do { \
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memset((work), 0, sizeof(struct kthread_work)); \
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INIT_LIST_HEAD(&(work)->node); \
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(work)->func = (fn); \
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} while (0)
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#define kthread_init_delayed_work(dwork, fn) \
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do { \
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kthread_init_work(&(dwork)->work, (fn)); \
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__init_timer(&(dwork)->timer, \
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kthread_delayed_work_timer_fn, \
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TIMER_IRQSAFE); \
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} while (0)
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int kthread_worker_fn(void *worker_ptr);
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__printf(2, 3)
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struct kthread_worker *
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kthread_create_worker(unsigned int flags, const char namefmt[], ...);
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__printf(3, 4) struct kthread_worker *
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kthread_create_worker_on_cpu(int cpu, unsigned int flags,
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const char namefmt[], ...);
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bool kthread_queue_work(struct kthread_worker *worker,
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struct kthread_work *work);
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bool kthread_queue_delayed_work(struct kthread_worker *worker,
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struct kthread_delayed_work *dwork,
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unsigned long delay);
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bool kthread_mod_delayed_work(struct kthread_worker *worker,
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struct kthread_delayed_work *dwork,
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unsigned long delay);
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void kthread_flush_work(struct kthread_work *work);
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void kthread_flush_worker(struct kthread_worker *worker);
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bool kthread_cancel_work_sync(struct kthread_work *work);
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bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work);
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void kthread_destroy_worker(struct kthread_worker *worker);
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#ifdef CONFIG_BLK_CGROUP
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void kthread_associate_blkcg(struct cgroup_subsys_state *css);
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struct cgroup_subsys_state *kthread_blkcg(void);
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#else
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static inline void kthread_associate_blkcg(struct cgroup_subsys_state *css) { }
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static inline struct cgroup_subsys_state *kthread_blkcg(void)
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{
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return NULL;
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}
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#endif
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#endif /* _LINUX_KTHREAD_H */
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