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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; /* L: work being processed */ 32 : : work_func_t current_func; /* L: current_work's fn */ 33 : : struct pool_workqueue *current_pwq; /* L: current_work's pwq */ 34 : : struct list_head scheduled; /* L: scheduled works */ 35 : : 36 : : /* 64 bytes boundary on 64bit, 32 on 32bit */ 37 : : 38 : : struct task_struct *task; /* I: worker task */ 39 : : struct worker_pool *pool; /* A: the associated pool */ 40 : : /* L: for rescuers */ 41 : : struct list_head node; /* A: anchored at pool->workers */ 42 : : /* A: runs through worker->node */ 43 : : 44 : : unsigned long last_active; /* L: last active timestamp */ 45 : : unsigned int flags; /* X: flags */ 46 : : int id; /* I: worker id */ 47 : : int sleeping; /* None */ 48 : : 49 : : /* 50 : : * Opaque string set with work_set_desc(). Printed out with task 51 : : * dump for debugging - WARN, BUG, panic or sysrq. 52 : : */ 53 : : char desc[WORKER_DESC_LEN]; 54 : : 55 : : /* used only by rescuers to point to the target workqueue */ 56 : : struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */ 57 : : 58 : : /* used by the scheduler to determine a worker's last known identity */ 59 : : work_func_t last_func; 60 : : }; 61 : : 62 : : /** 63 : : * current_wq_worker - return struct worker if %current is a workqueue worker 64 : : */ 65 : 993 : static inline struct worker *current_wq_worker(void) 66 : : { 67 [ + - - + ]: 993 : if (in_task() && (current->flags & PF_WQ_WORKER)) 68 : 0 : return kthread_data(current); 69 : : return NULL; 70 : : } 71 : : 72 : : /* 73 : : * Scheduler hooks for concurrency managed workqueue. Only to be used from 74 : : * sched/ and workqueue.c. 75 : : */ 76 : : void wq_worker_running(struct task_struct *task); 77 : : void wq_worker_sleeping(struct task_struct *task); 78 : : work_func_t wq_worker_last_func(struct task_struct *task); 79 : : 80 : : #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */