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1 /*
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>.
6  *  UCRL-CODE-235197
7  *
8  *  This file is part of the SPL, Solaris Porting Layer.
9  *
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.
14  *
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
18  *  for more details.
19  *
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/>.
22  */
23
24 #ifndef _SPL_TASKQ_H
25 #define _SPL_TASKQ_H
26
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>
35 #include <sys/wait.h>
36
37 #define TASKQ_NAMELEN           31
38
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
45
46 /*
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.
50  */
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
58
59 /*
60  * Reserved taskqid values.
61  */
62 #define TASKQID_INVALID         ((taskqid_t)0)
63 #define TASKQID_INITIAL         ((taskqid_t)1)
64
65 /*
66  * spin_lock(lock) and spin_lock_nested(lock,0) are equivalent,
67  * so TQ_LOCK_DYNAMIC must not evaluate to 0
68  */
69 typedef enum tq_lock_role {
70         TQ_LOCK_GENERAL =       0,
71         TQ_LOCK_DYNAMIC =       1,
72 } tq_lock_role_t;
73
74 typedef unsigned long taskqid_t;
75 typedef void (task_func_t)(void *);
76
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 */
102 } taskq_t;
103
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;
109         taskqid_t               tqent_id;
110         task_func_t             *tqent_func;
111         void                    *tqent_arg;
112         taskq_t                 *tqent_taskq;
113         uintptr_t               tqent_flags;
114         unsigned long           tqent_birth;
115 } taskq_ent_t;
116
117 #define TQENT_FLAG_PREALLOC     0x1
118 #define TQENT_FLAG_CANCEL       0x2
119
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;
124         taskq_t                 *tqt_tq;
125         taskqid_t               tqt_id;
126         taskq_ent_t             *tqt_task;
127         uintptr_t               tqt_flags;
128 } taskq_thread_t;
129
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;
134
135 /* List of all taskqs */
136 extern struct list_head tq_list;
137 extern struct rw_semaphore tq_list_sem;
138
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 *,
141     uint_t, clock_t);
142 extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t,
143     taskq_ent_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);
154
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)
159
160 int spl_taskq_init(void);
161 void spl_taskq_fini(void);
162
163 #endif  /* _SPL_TASKQ_H */