1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2018 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31#ifndef _LINUX_SCHED_H_ 32#define _LINUX_SCHED_H_ 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/proc.h> 37#include <sys/sched.h> 38#include <sys/sleepqueue.h> 39#include <sys/time.h> 40 41#include <linux/bitmap.h> 42#include <linux/compat.h> 43#include <linux/completion.h> 44#include <linux/mm_types.h> 45#include <linux/pid.h> 46#include <linux/slab.h> 47#include <linux/string.h> 48#include <linux/time.h> 49 50#include <asm/atomic.h> 51 52#define MAX_SCHEDULE_TIMEOUT INT_MAX 53 54#define TASK_RUNNING 0x0000 55#define TASK_INTERRUPTIBLE 0x0001 56#define TASK_UNINTERRUPTIBLE 0x0002 57#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 58#define TASK_WAKING 0x0100 59#define TASK_PARKED 0x0200 60 61#define TASK_COMM_LEN (MAXCOMLEN + 1) 62 63 struct work_struct; 64 struct task_struct { 65 struct thread *task_thread; 66 struct mm_struct *mm; 67 linux_task_fn_t *task_fn; 68 void *task_data; 69 int task_ret; 70 atomic_t usage; 71 atomic_t state; 72 atomic_t kthread_flags; 73 pid_t pid; /* BSD thread ID */ 74 const char *comm; 75 void *bsd_ioctl_data; 76 unsigned bsd_ioctl_len; 77 struct completion parked; 78 struct completion exited; 79#define TS_RCU_TYPE_MAX 2 80 TAILQ_ENTRY(task_struct) rcu_entry[TS_RCU_TYPE_MAX]; 81 int rcu_recurse[TS_RCU_TYPE_MAX]; 82 int bsd_interrupt_value; 83 struct work_struct *work; /* current work struct, if set */ 84 struct task_struct *group_leader; 85}; 86 87#define current ({ \ 88 struct thread *__td = curthread; \ 89 linux_set_current(__td); \ 90 ((struct task_struct *)__td->td_lkpi_task); \ 91}) 92 93#define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 94#define task_pid(task) ((task)->pid) 95#define task_pid_nr(task) ((task)->pid) 96#define task_pid_vnr(task) ((task)->pid) 97#define get_pid(x) (x) 98#define put_pid(x) do { } while (0) 99#define current_euid() (curthread->td_ucred->cr_uid) 100#define task_euid(task) ((task)->task_thread->td_ucred->cr_uid) 101 102#define get_task_state(task) atomic_read(&(task)->state) 103#define set_task_state(task, x) atomic_set(&(task)->state, (x)) 104#define __set_task_state(task, x) ((task)->state.counter = (x)) 105#define set_current_state(x) set_task_state(current, x) 106#define __set_current_state(x) __set_task_state(current, x) 107 108 static inline void 109 get_task_struct(struct task_struct *task) 110{ 111 atomic_inc(&task->usage); 112} 113 114 static inline void 115 put_task_struct(struct task_struct *task) 116{ 117 if (atomic_dec_and_test(&task->usage)) 118 linux_free_current(task); 119} 120 121#define cond_resched() do { if (!cold) sched_relinquish(curthread); } while (0) 122 123#define yield() kern_yield(PRI_UNCHANGED) 124#define sched_yield() sched_relinquish(curthread) 125 126#define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 127 128 bool linux_signal_pending(struct task_struct *task); 129 bool linux_fatal_signal_pending(struct task_struct *task); 130 bool linux_signal_pending_state(long state, struct task_struct *task); 131 void linux_send_sig(int signo, struct task_struct *task); 132 133#define signal_pending(task) linux_signal_pending(task) 134#define fatal_signal_pending(task) linux_fatal_signal_pending(task) 135#define signal_pending_state(state, task) \ 136 linux_signal_pending_state(state, task) 137#define send_sig(signo, task, priv) do { \ 138 CTASSERT((priv) == 0); \ 139 linux_send_sig(signo, task); \ 140} while (0) 141 142 int linux_schedule_timeout(int timeout); 143 144 static inline void 145 linux_schedule_save_interrupt_value(struct task_struct *task, int value) 146{ 147 task->bsd_interrupt_value = value; 148} 149 150 bool linux_task_exiting(struct task_struct *task); 151 152#define current_exiting() \ 153 linux_task_exiting(current) 154 155 static inline int 156 linux_schedule_get_interrupt_value(struct task_struct *task) 157{ 158 int value = task->bsd_interrupt_value; 159 task->bsd_interrupt_value = 0; 160 return (value); 161} 162 163#define schedule() \ 164 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT) 165#define schedule_timeout(timeout) \ 166 linux_schedule_timeout(timeout) 167#define schedule_timeout_killable(timeout) \ 168 schedule_timeout_interruptible(timeout) 169#define schedule_timeout_interruptible(timeout) ({ \ 170 set_current_state(TASK_INTERRUPTIBLE); \ 171 schedule_timeout(timeout); \ 172}) 173#define schedule_timeout_uninterruptible(timeout) ({ \ 174 set_current_state(TASK_UNINTERRUPTIBLE); \ 175 schedule_timeout(timeout); \ 176}) 177 178#define io_schedule() schedule() 179#define io_schedule_timeout(timeout) schedule_timeout(timeout) 180 181 static inline uint64_t 182 local_clock(void) 183{ 184 struct timespec ts; 185 186 nanotime(&ts); 187 return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec); 188} 189 190 static inline const char * 191 get_task_comm(char *buf, struct task_struct *task) 192{ 193 194 buf[0] = 0; /* buffer is too small */ 195 return (task->comm); 196} 197 198#endif /* _LINUX_SCHED_H_ */ 199