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222 lines
6.9 KiB
222 lines
6.9 KiB
/* 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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struct mm_struct; |
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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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void kthread_set_per_cpu(struct task_struct *k, int cpu); |
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bool kthread_is_per_cpu(struct task_struct *k); |
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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_should_park(struct task_struct *k); |
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bool kthread_freezable_should_stop(bool *was_frozen); |
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void *kthread_func(struct task_struct *k); |
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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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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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raw_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 = __RAW_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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timer_setup(&(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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void kthread_use_mm(struct mm_struct *mm); |
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void kthread_unuse_mm(struct mm_struct *mm); |
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struct cgroup_subsys_state; |
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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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