1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * kernel/workqueue_internal.h 4 * 5 * Workqueue internal header file. Only to be included by workqueue and 6 * core kernel subsystems. 7 */ 8 #ifndef _KERNEL_WORKQUEUE_INTERNAL_H 9 #define _KERNEL_WORKQUEUE_INTERNAL_H 10 11 #include <linux/workqueue.h> 12 #include <linux/kthread.h> 13 #include <linux/preempt.h> 14 15 struct worker_pool; 16 17 /* 18 * The poor guys doing the actual heavy lifting. All on-duty workers are 19 * either serving the manager role, on idle list or on busy hash. For 20 * details on the locking annotation (L, I, X...), refer to workqueue.c. 21 * 22 * Only to be used in workqueue and async. 23 */ 24 struct worker { 25 /* on idle list while idle, on busy hash table while busy */ 26 union { 27 struct list_head entry; /* L: while idle */ 28 struct hlist_node hentry; /* L: while busy */ 29 }; 30 31 struct work_struct *current_work; /* K: work being processed and its */ 32 work_func_t current_func; /* K: function */ 33 struct pool_workqueue *current_pwq; /* K: pwq */ 34 u64 current_at; /* K: runtime at start or last wakeup */ 35 unsigned int current_color; /* K: color */ 36 37 int sleeping; /* S: is worker sleeping? */ 38 39 /* used by the scheduler to determine a worker's last known identity */ 40 work_func_t last_func; /* K: last work's fn */ 41 42 struct list_head scheduled; /* L: scheduled works */ 43 44 struct task_struct *task; /* I: worker task */ 45 struct worker_pool *pool; /* A: the associated pool */ 46 /* L: for rescuers */ 47 struct list_head node; /* A: anchored at pool->workers */ 48 /* A: runs through worker->node */ 49 50 unsigned long last_active; /* K: last active timestamp */ 51 unsigned int flags; /* X: flags */ 52 int id; /* I: worker id */ 53 54 /* 55 * Opaque string set with work_set_desc(). Printed out with task 56 * dump for debugging - WARN, BUG, panic or sysrq. 57 */ 58 char desc[WORKER_DESC_LEN]; 59 60 /* used only by rescuers to point to the target workqueue */ 61 struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */ 62 }; 63 64 /** 65 * current_wq_worker - return struct worker if %current is a workqueue worker 66 */ 67 static inline struct worker *current_wq_worker(void) 68 { 69 if (in_task() && (current->flags & PF_WQ_WORKER)) 70 return kthread_data(current); 71 return NULL; 72 } 73 74 /* 75 * Scheduler hooks for concurrency managed workqueue. Only to be used from 76 * sched/ and workqueue.c. 77 */ 78 void wq_worker_running(struct task_struct *task); 79 void wq_worker_sleeping(struct task_struct *task); 80 void wq_worker_tick(struct task_struct *task); 81 work_func_t wq_worker_last_func(struct task_struct *task); 82 83 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ 84