2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
10 * The SPL is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * The SPL is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 * You should have received a copy of the GNU General Public License along
21 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
27 #include <linux/module.h>
28 #include <linux/gfp.h>
29 #include <linux/slab.h>
30 #include <linux/interrupt.h>
31 #include <linux/kthread.h>
32 #include <sys/types.h>
33 #include <sys/thread.h>
34 #include <sys/rwlock.h>
37 #define TASKQ_NAMELEN 31
39 #define TASKQ_PREPOPULATE 0x00000001
40 #define TASKQ_CPR_SAFE 0x00000002
41 #define TASKQ_DYNAMIC 0x00000004
42 #define TASKQ_THREADS_CPU_PCT 0x00000008
43 #define TASKQ_DC_BATCH 0x00000010
44 #define TASKQ_ACTIVE 0x80000000
47 * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
48 * KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly
49 * large so as not to conflict with already used GFP_* defines.
51 #define TQ_SLEEP 0x00000000
52 #define TQ_NOSLEEP 0x00000001
53 #define TQ_PUSHPAGE 0x00000002
54 #define TQ_NOQUEUE 0x01000000
55 #define TQ_NOALLOC 0x02000000
56 #define TQ_NEW 0x04000000
57 #define TQ_FRONT 0x08000000
60 * Reserved taskqid values.
62 #define TASKQID_INVALID ((taskqid_t)0)
63 #define TASKQID_INITIAL ((taskqid_t)1)
66 * spin_lock(lock) and spin_lock_nested(lock,0) are equivalent,
67 * so TQ_LOCK_DYNAMIC must not evaluate to 0
69 typedef enum tq_lock_role {
74 typedef unsigned long taskqid_t;
75 typedef void (task_func_t)(void *);
77 typedef struct taskq {
78 spinlock_t tq_lock; /* protects taskq_t */
79 char *tq_name; /* taskq name */
80 int tq_instance; /* instance of tq_name */
81 struct list_head tq_thread_list; /* list of all threads */
82 struct list_head tq_active_list; /* list of active threads */
83 int tq_nactive; /* # of active threads */
84 int tq_nthreads; /* # of existing threads */
85 int tq_nspawn; /* # of threads being spawned */
86 int tq_maxthreads; /* # of threads maximum */
87 int tq_pri; /* priority */
88 int tq_minalloc; /* min taskq_ent_t pool size */
89 int tq_maxalloc; /* max taskq_ent_t pool size */
90 int tq_nalloc; /* cur taskq_ent_t pool size */
91 uint_t tq_flags; /* flags */
92 taskqid_t tq_next_id; /* next pend/work id */
93 taskqid_t tq_lowest_id; /* lowest pend/work id */
94 struct list_head tq_free_list; /* free taskq_ent_t's */
95 struct list_head tq_pend_list; /* pending taskq_ent_t's */
96 struct list_head tq_prio_list; /* priority taskq_ent_t's */
97 struct list_head tq_delay_list; /* delayed taskq_ent_t's */
98 struct list_head tq_taskqs; /* all taskq_t's */
99 spl_wait_queue_head_t tq_work_waitq; /* new work waitq */
100 spl_wait_queue_head_t tq_wait_waitq; /* wait waitq */
101 tq_lock_role_t tq_lock_class; /* class when taking tq_lock */
104 typedef struct taskq_ent {
105 spinlock_t tqent_lock;
106 spl_wait_queue_head_t tqent_waitq;
107 struct timer_list tqent_timer;
108 struct list_head tqent_list;
110 task_func_t *tqent_func;
112 taskq_t *tqent_taskq;
113 uintptr_t tqent_flags;
114 unsigned long tqent_birth;
117 #define TQENT_FLAG_PREALLOC 0x1
118 #define TQENT_FLAG_CANCEL 0x2
120 typedef struct taskq_thread {
121 struct list_head tqt_thread_list;
122 struct list_head tqt_active_list;
123 struct task_struct *tqt_thread;
126 taskq_ent_t *tqt_task;
130 /* Global system-wide dynamic task queue available for all consumers */
131 extern taskq_t *system_taskq;
132 /* Global dynamic task queue for long delay */
133 extern taskq_t *system_delay_taskq;
135 /* List of all taskqs */
136 extern struct list_head tq_list;
137 extern struct rw_semaphore tq_list_sem;
139 extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
140 extern taskqid_t taskq_dispatch_delay(taskq_t *, task_func_t, void *,
142 extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t,
144 extern int taskq_empty_ent(taskq_ent_t *);
145 extern void taskq_init_ent(taskq_ent_t *);
146 extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
147 extern void taskq_destroy(taskq_t *);
148 extern void taskq_wait_id(taskq_t *, taskqid_t);
149 extern void taskq_wait_outstanding(taskq_t *, taskqid_t);
150 extern void taskq_wait(taskq_t *);
151 extern int taskq_cancel_id(taskq_t *, taskqid_t);
152 extern int taskq_member(taskq_t *, kthread_t *);
153 extern taskq_t *taskq_of_curthread(void);
155 #define taskq_create_proc(name, nthreads, pri, min, max, proc, flags) \
156 taskq_create(name, nthreads, pri, min, max, flags)
157 #define taskq_create_sysdc(name, nthreads, min, max, proc, dc, flags) \
158 taskq_create(name, nthreads, maxclsyspri, min, max, flags)
160 int spl_taskq_init(void);
161 void spl_taskq_fini(void);
163 #endif /* _SPL_TASKQ_H */