| /* |
| * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. |
| * Copyright (C) 2007 The Regents of the University of California. |
| * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). |
| * Written by Brian Behlendorf <behlendorf1@llnl.gov>. |
| * UCRL-CODE-235197 |
| * |
| * This file is part of the SPL, Solaris Porting Layer. |
| * For details, see <http://zfsonlinux.org/>. |
| * |
| * The SPL is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * The SPL is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #ifndef _SPL_TASKQ_H |
| #define _SPL_TASKQ_H |
| |
| #include <linux/module.h> |
| #include <linux/gfp.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/kthread.h> |
| #include <sys/types.h> |
| #include <sys/thread.h> |
| #include <sys/rwlock.h> |
| #include <sys/wait.h> |
| |
| #define TASKQ_NAMELEN 31 |
| |
| #define TASKQ_PREPOPULATE 0x00000001 |
| #define TASKQ_CPR_SAFE 0x00000002 |
| #define TASKQ_DYNAMIC 0x00000004 |
| #define TASKQ_THREADS_CPU_PCT 0x00000008 |
| #define TASKQ_DC_BATCH 0x00000010 |
| #define TASKQ_ACTIVE 0x80000000 |
| |
| /* |
| * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as |
| * KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly |
| * large so as not to conflict with already used GFP_* defines. |
| */ |
| #define TQ_SLEEP 0x00000000 |
| #define TQ_NOSLEEP 0x00000001 |
| #define TQ_PUSHPAGE 0x00000002 |
| #define TQ_NOQUEUE 0x01000000 |
| #define TQ_NOALLOC 0x02000000 |
| #define TQ_NEW 0x04000000 |
| #define TQ_FRONT 0x08000000 |
| |
| /* |
| * Reserved taskqid values. |
| */ |
| #define TASKQID_INVALID ((taskqid_t)0) |
| #define TASKQID_INITIAL ((taskqid_t)1) |
| |
| /* |
| * spin_lock(lock) and spin_lock_nested(lock,0) are equivalent, |
| * so TQ_LOCK_DYNAMIC must not evaluate to 0 |
| */ |
| typedef enum tq_lock_role { |
| TQ_LOCK_GENERAL = 0, |
| TQ_LOCK_DYNAMIC = 1, |
| } tq_lock_role_t; |
| |
| typedef unsigned long taskqid_t; |
| typedef void (task_func_t)(void *); |
| |
| typedef struct taskq { |
| spinlock_t tq_lock; /* protects taskq_t */ |
| char *tq_name; /* taskq name */ |
| int tq_instance; /* instance of tq_name */ |
| struct list_head tq_thread_list; /* list of all threads */ |
| struct list_head tq_active_list; /* list of active threads */ |
| int tq_nactive; /* # of active threads */ |
| int tq_nthreads; /* # of existing threads */ |
| int tq_nspawn; /* # of threads being spawned */ |
| int tq_maxthreads; /* # of threads maximum */ |
| int tq_pri; /* priority */ |
| int tq_minalloc; /* min taskq_ent_t pool size */ |
| int tq_maxalloc; /* max taskq_ent_t pool size */ |
| int tq_nalloc; /* cur taskq_ent_t pool size */ |
| uint_t tq_flags; /* flags */ |
| taskqid_t tq_next_id; /* next pend/work id */ |
| taskqid_t tq_lowest_id; /* lowest pend/work id */ |
| struct list_head tq_free_list; /* free taskq_ent_t's */ |
| struct list_head tq_pend_list; /* pending taskq_ent_t's */ |
| struct list_head tq_prio_list; /* priority taskq_ent_t's */ |
| struct list_head tq_delay_list; /* delayed taskq_ent_t's */ |
| struct list_head tq_taskqs; /* all taskq_t's */ |
| spl_wait_queue_head_t tq_work_waitq; /* new work waitq */ |
| spl_wait_queue_head_t tq_wait_waitq; /* wait waitq */ |
| tq_lock_role_t tq_lock_class; /* class when taking tq_lock */ |
| } taskq_t; |
| |
| typedef struct taskq_ent { |
| spinlock_t tqent_lock; |
| spl_wait_queue_head_t tqent_waitq; |
| struct timer_list tqent_timer; |
| struct list_head tqent_list; |
| taskqid_t tqent_id; |
| task_func_t *tqent_func; |
| void *tqent_arg; |
| taskq_t *tqent_taskq; |
| uintptr_t tqent_flags; |
| unsigned long tqent_birth; |
| } taskq_ent_t; |
| |
| #define TQENT_FLAG_PREALLOC 0x1 |
| #define TQENT_FLAG_CANCEL 0x2 |
| |
| typedef struct taskq_thread { |
| struct list_head tqt_thread_list; |
| struct list_head tqt_active_list; |
| struct task_struct *tqt_thread; |
| taskq_t *tqt_tq; |
| taskqid_t tqt_id; |
| taskq_ent_t *tqt_task; |
| uintptr_t tqt_flags; |
| } taskq_thread_t; |
| |
| /* Global system-wide dynamic task queue available for all consumers */ |
| extern taskq_t *system_taskq; |
| /* Global dynamic task queue for long delay */ |
| extern taskq_t *system_delay_taskq; |
| |
| /* List of all taskqs */ |
| extern struct list_head tq_list; |
| extern struct rw_semaphore tq_list_sem; |
| |
| extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t); |
| extern taskqid_t taskq_dispatch_delay(taskq_t *, task_func_t, void *, |
| uint_t, clock_t); |
| extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t, |
| taskq_ent_t *); |
| extern int taskq_empty_ent(taskq_ent_t *); |
| extern void taskq_init_ent(taskq_ent_t *); |
| extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t); |
| extern void taskq_destroy(taskq_t *); |
| extern void taskq_wait_id(taskq_t *, taskqid_t); |
| extern void taskq_wait_outstanding(taskq_t *, taskqid_t); |
| extern void taskq_wait(taskq_t *); |
| extern int taskq_cancel_id(taskq_t *, taskqid_t); |
| extern int taskq_member(taskq_t *, kthread_t *); |
| |
| #define taskq_create_proc(name, nthreads, pri, min, max, proc, flags) \ |
| taskq_create(name, nthreads, pri, min, max, flags) |
| #define taskq_create_sysdc(name, nthreads, min, max, proc, dc, flags) \ |
| taskq_create(name, nthreads, maxclsyspri, min, max, flags) |
| |
| int spl_taskq_init(void); |
| void spl_taskq_fini(void); |
| |
| #endif /* _SPL_TASKQ_H */ |