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