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 task_struct { 64 struct thread *task_thread; 65 struct mm_struct *mm; 66 linux_task_fn_t *task_fn; 67 void *task_data; 68 int task_ret; 69 atomic_t usage; 70 atomic_t state; 71 atomic_t kthread_flags; 72 pid_t pid; /* BSD thread ID */ 73 const char *comm; 74 void *bsd_ioctl_data; 75 unsigned bsd_ioctl_len; 76 struct completion parked; 77 struct completion exited; 78 TAILQ_ENTRY(task_struct) rcu_entry; 79 int rcu_recurse; 80 int bsd_interrupt_value; 81 }; 82 83 #define current ({ \ 84 struct thread *__td = curthread; \ 85 linux_set_current(__td); \ 86 ((struct task_struct *)__td->td_lkpi_task); \ 87 }) 88 89 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 90 #define task_pid(task) ((task)->pid) 91 #define task_pid_nr(task) ((task)->pid) 92 #define task_pid_vnr(task) ((task)->pid) 93 #define get_pid(x) (x) 94 #define put_pid(x) do { } while (0) 95 #define current_euid() (curthread->td_ucred->cr_uid) 96 97 #define set_task_state(task, x) atomic_set(&(task)->state, (x)) 98 #define __set_task_state(task, x) ((task)->state.counter = (x)) 99 #define set_current_state(x) set_task_state(current, x) 100 #define __set_current_state(x) __set_task_state(current, x) 101 102 static inline void 103 get_task_struct(struct task_struct *task) 104 { 105 atomic_inc(&task->usage); 106 } 107 108 static inline void 109 put_task_struct(struct task_struct *task) 110 { 111 if (atomic_dec_and_test(&task->usage)) 112 linux_free_current(task); 113 } 114 115 #define cond_resched() do { if (!cold) sched_relinquish(curthread); } while (0) 116 117 #define yield() kern_yield(PRI_UNCHANGED) 118 #define sched_yield() sched_relinquish(curthread) 119 120 #define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 121 122 bool linux_signal_pending(struct task_struct *task); 123 bool linux_fatal_signal_pending(struct task_struct *task); 124 bool linux_signal_pending_state(long state, struct task_struct *task); 125 void linux_send_sig(int signo, struct task_struct *task); 126 127 #define signal_pending(task) linux_signal_pending(task) 128 #define fatal_signal_pending(task) linux_fatal_signal_pending(task) 129 #define signal_pending_state(state, task) \ 130 linux_signal_pending_state(state, task) 131 #define send_sig(signo, task, priv) do { \ 132 CTASSERT((priv) == 0); \ 133 linux_send_sig(signo, task); \ 134 } while (0) 135 136 int linux_schedule_timeout(int timeout); 137 138 static inline void 139 linux_schedule_save_interrupt_value(struct task_struct *task, int value) 140 { 141 task->bsd_interrupt_value = value; 142 } 143 144 static inline int 145 linux_schedule_get_interrupt_value(struct task_struct *task) 146 { 147 int value = task->bsd_interrupt_value; 148 task->bsd_interrupt_value = 0; 149 return (value); 150 } 151 152 #define schedule() \ 153 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT) 154 #define schedule_timeout(timeout) \ 155 linux_schedule_timeout(timeout) 156 #define schedule_timeout_killable(timeout) \ 157 schedule_timeout_interruptible(timeout) 158 #define schedule_timeout_interruptible(timeout) ({ \ 159 set_current_state(TASK_INTERRUPTIBLE); \ 160 schedule_timeout(timeout); \ 161 }) 162 #define schedule_timeout_uninterruptible(timeout) ({ \ 163 set_current_state(TASK_UNINTERRUPTIBLE); \ 164 schedule_timeout(timeout); \ 165 }) 166 167 #define io_schedule() schedule() 168 #define io_schedule_timeout(timeout) schedule_timeout(timeout) 169 170 static inline uint64_t 171 local_clock(void) 172 { 173 struct timespec ts; 174 175 nanotime(&ts); 176 return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec); 177 } 178 179 #endif /* _LINUX_SCHED_H_ */ 180