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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>. | |
715f6251 | 6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
716154c5 BB |
10 | * |
11 | * The SPL is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
715f6251 | 15 | * |
716154c5 | 16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT |
715f6251 | 17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
716154c5 BB |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
23 | \*****************************************************************************/ | |
715f6251 | 24 | |
09b414e8 | 25 | #ifndef _SPL_TASKQ_H |
26 | #define _SPL_TASKQ_H | |
f1ca4da6 | 27 | |
f1b59d26 | 28 | #include <linux/module.h> |
f1ca4da6 | 29 | #include <linux/gfp.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/interrupt.h> | |
bcd68186 | 32 | #include <linux/kthread.h> |
f4b37741 | 33 | #include <sys/types.h> |
925ca8cc | 34 | #include <sys/thread.h> |
f1ca4da6 | 35 | |
472a34ca | 36 | #define TASKQ_NAMELEN 31 |
f1ca4da6 | 37 | |
472a34ca BB |
38 | #define TASKQ_PREPOPULATE 0x00000001 |
39 | #define TASKQ_CPR_SAFE 0x00000002 | |
40 | #define TASKQ_DYNAMIC 0x00000004 | |
41 | #define TASKQ_THREADS_CPU_PCT 0x00000008 | |
42 | #define TASKQ_DC_BATCH 0x00000010 | |
f7a973d9 | 43 | #define TASKQ_ACTIVE 0x80000000 |
f1ca4da6 | 44 | |
f1ca4da6 | 45 | /* |
46 | * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as | |
bcd68186 | 47 | * KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly |
48 | * large so as not to conflict with already used GFP_* defines. | |
f1ca4da6 | 49 | */ |
472a34ca BB |
50 | #define TQ_SLEEP 0x00000000 |
51 | #define TQ_NOSLEEP 0x00000001 | |
52 | #define TQ_PUSHPAGE 0x00000002 | |
53 | #define TQ_NOQUEUE 0x01000000 | |
54 | #define TQ_NOALLOC 0x02000000 | |
55 | #define TQ_NEW 0x04000000 | |
56 | #define TQ_FRONT 0x08000000 | |
bcd68186 | 57 | |
326172d8 OF |
58 | /* spin_lock(lock) and spin_lock_nested(lock,0) are equivalent, |
59 | * so TQ_LOCK_DYNAMIC must not evaluate to 0 | |
60 | */ | |
61 | typedef enum tq_lock_role { | |
62 | TQ_LOCK_GENERAL = 0, | |
63 | TQ_LOCK_DYNAMIC = 1, | |
64 | } tq_lock_role_t; | |
65 | ||
d9acd930 BB |
66 | typedef unsigned long taskqid_t; |
67 | typedef void (task_func_t)(void *); | |
68 | ||
bcd68186 | 69 | typedef struct taskq { |
472a34ca BB |
70 | spinlock_t tq_lock; /* protects taskq_t */ |
71 | unsigned long tq_lock_flags; /* interrupt state */ | |
f7a973d9 | 72 | char *tq_name; /* taskq name */ |
472a34ca BB |
73 | struct list_head tq_thread_list;/* list of all threads */ |
74 | struct list_head tq_active_list;/* list of active threads */ | |
75 | int tq_nactive; /* # of active threads */ | |
f7a973d9 BB |
76 | int tq_nthreads; /* # of existing threads */ |
77 | int tq_nspawn; /* # of threads being spawned */ | |
78 | int tq_maxthreads; /* # of threads maximum */ | |
472a34ca BB |
79 | int tq_pri; /* priority */ |
80 | int tq_minalloc; /* min task_t pool size */ | |
81 | int tq_maxalloc; /* max task_t pool size */ | |
82 | int tq_nalloc; /* cur task_t pool size */ | |
83 | uint_t tq_flags; /* flags */ | |
84 | taskqid_t tq_next_id; /* next pend/work id */ | |
85 | taskqid_t tq_lowest_id; /* lowest pend/work id */ | |
86 | struct list_head tq_free_list; /* free task_t's */ | |
87 | struct list_head tq_pend_list; /* pending task_t's */ | |
88 | struct list_head tq_prio_list; /* priority pending task_t's */ | |
d9acd930 | 89 | struct list_head tq_delay_list; /* delayed task_t's */ |
472a34ca BB |
90 | wait_queue_head_t tq_work_waitq; /* new work waitq */ |
91 | wait_queue_head_t tq_wait_waitq; /* wait waitq */ | |
326172d8 | 92 | tq_lock_role_t tq_lock_class; /* class used when taking tq_lock */ |
bcd68186 | 93 | } taskq_t; |
f1ca4da6 | 94 | |
d9acd930 BB |
95 | typedef struct taskq_ent { |
96 | spinlock_t tqent_lock; | |
97 | wait_queue_head_t tqent_waitq; | |
98 | struct timer_list tqent_timer; | |
99 | struct list_head tqent_list; | |
100 | taskqid_t tqent_id; | |
101 | task_func_t *tqent_func; | |
102 | void *tqent_arg; | |
103 | taskq_t *tqent_taskq; | |
104 | uintptr_t tqent_flags; | |
105 | } taskq_ent_t; | |
106 | ||
107 | #define TQENT_FLAG_PREALLOC 0x1 | |
108 | #define TQENT_FLAG_CANCEL 0x2 | |
109 | ||
2c02b71b | 110 | typedef struct taskq_thread { |
472a34ca BB |
111 | struct list_head tqt_thread_list; |
112 | struct list_head tqt_active_list; | |
113 | struct task_struct *tqt_thread; | |
114 | taskq_t *tqt_tq; | |
115 | taskqid_t tqt_id; | |
d9acd930 | 116 | taskq_ent_t *tqt_task; |
472a34ca | 117 | uintptr_t tqt_flags; |
2c02b71b PS |
118 | } taskq_thread_t; |
119 | ||
e9cb2b4f BB |
120 | /* Global system-wide dynamic task queue available for all consumers */ |
121 | extern taskq_t *system_taskq; | |
122 | ||
aed8671c | 123 | extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t); |
d9acd930 BB |
124 | extern taskqid_t taskq_dispatch_delay(taskq_t *, task_func_t, void *, |
125 | uint_t, clock_t); | |
aed8671c BB |
126 | extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t, |
127 | taskq_ent_t *); | |
128 | extern int taskq_empty_ent(taskq_ent_t *); | |
129 | extern void taskq_init_ent(taskq_ent_t *); | |
130 | extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t); | |
131 | extern void taskq_destroy(taskq_t *); | |
132 | extern void taskq_wait_id(taskq_t *, taskqid_t); | |
a876b030 | 133 | extern void taskq_wait_outstanding(taskq_t *, taskqid_t); |
aed8671c | 134 | extern void taskq_wait(taskq_t *); |
d9acd930 | 135 | extern int taskq_cancel_id(taskq_t *, taskqid_t); |
c5a8b1e1 | 136 | extern int taskq_member(taskq_t *, void *); |
aed8671c BB |
137 | |
138 | #define taskq_create_proc(name, nthreads, pri, min, max, proc, flags) \ | |
139 | taskq_create(name, nthreads, pri, min, max, flags) | |
140 | #define taskq_create_sysdc(name, nthreads, min, max, proc, dc, flags) \ | |
9dc5ffbe | 141 | taskq_create(name, nthreads, maxclsyspri, min, max, flags) |
bcd68186 | 142 | |
e9cb2b4f BB |
143 | int spl_taskq_init(void); |
144 | void spl_taskq_fini(void); | |
145 | ||
09b414e8 | 146 | #endif /* _SPL_TASKQ_H */ |