Line data    Source code

       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             :         unsigned int            current_color;  /* L: current_work's color */
      35             :         struct list_head        scheduled;      /* L: scheduled works */
      36             : 
      37             :         /* 64 bytes boundary on 64bit, 32 on 32bit */
      38             : 
      39             :         struct task_struct      *task;          /* I: worker task */
      40             :         struct worker_pool      *pool;          /* A: the associated pool */
      41             :                                                 /* L: for rescuers */
      42             :         struct list_head        node;           /* A: anchored at pool->workers */
      43             :                                                 /* A: runs through worker->node */
      44             : 
      45             :         unsigned long           last_active;    /* L: last active timestamp */
      46             :         unsigned int            flags;          /* X: flags */
      47             :         int                     id;             /* I: worker id */
      48             :         int                     sleeping;       /* None */
      49             : 
      50             :         /*
      51             :          * Opaque string set with work_set_desc().  Printed out with task
      52             :          * dump for debugging - WARN, BUG, panic or sysrq.
      53             :          */
      54             :         char                    desc[WORKER_DESC_LEN];
      55             : 
      56             :         /* used only by rescuers to point to the target workqueue */
      57             :         struct workqueue_struct *rescue_wq;     /* I: the workqueue to rescue */
      58             : 
      59             :         /* used by the scheduler to determine a worker's last known identity */
      60             :         work_func_t             last_func;
      61             : };
      62             : 
      63             : /**
      64             :  * current_wq_worker - return struct worker if %current is a workqueue worker
      65             :  */
      66           2 : static inline struct worker *current_wq_worker(void)
      67             : {
      68           4 :         if (in_task() && (current->flags & PF_WQ_WORKER))
      69           0 :                 return kthread_data(current);
      70             :         return NULL;
      71             : }
      72             : 
      73             : /*
      74             :  * Scheduler hooks for concurrency managed workqueue.  Only to be used from
      75             :  * sched/ and workqueue.c.
      76             :  */
      77             : void wq_worker_running(struct task_struct *task);
      78             : void wq_worker_sleeping(struct task_struct *task);
      79             : work_func_t wq_worker_last_func(struct task_struct *task);
      80             : 
      81             : #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */