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/*
* 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>
#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
/*
* 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 pending taskq_ent_t's */
struct list_head tq_delay_list; /* delayed taskq_ent_t's */
struct list_head tq_taskqs; /* all taskq_t's */
wait_queue_head_t tq_work_waitq; /* new work waitq */
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;
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;
} 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;
/* 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 *, void *);
#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 */
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