1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2017 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 40 #include <linux/compat.h> 41 #include <linux/completion.h> 42 #include <linux/pid.h> 43 #include <linux/slab.h> 44 #include <linux/mm_types.h> 45 #include <linux/string.h> 46 #include <linux/bitmap.h> 47 48 #include <asm/atomic.h> 49 50 #define MAX_SCHEDULE_TIMEOUT INT_MAX 51 52 #define TASK_RUNNING 0x0000 53 #define TASK_INTERRUPTIBLE 0x0001 54 #define TASK_UNINTERRUPTIBLE 0x0002 55 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 56 #define TASK_WAKING 0x0100 57 #define TASK_PARKED 0x0200 58 59 #define TASK_COMM_LEN (MAXCOMLEN + 1) 60 61 struct task_struct { 62 struct thread *task_thread; 63 struct mm_struct *mm; 64 linux_task_fn_t *task_fn; 65 void *task_data; 66 int task_ret; 67 atomic_t usage; 68 int state; 69 atomic_t kthread_flags; 70 pid_t pid; /* BSD thread ID */ 71 const char *comm; 72 void *bsd_ioctl_data; 73 unsigned bsd_ioctl_len; 74 struct completion parked; 75 struct completion exited; 76 TAILQ_ENTRY(task_struct) rcu_entry; 77 int rcu_recurse; 78 }; 79 80 #define current ({ \ 81 struct thread *__td = curthread; \ 82 linux_set_current(__td); \ 83 ((struct task_struct *)__td->td_lkpi_task); \ 84 }) 85 86 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 87 #define task_pid(task) ((task)->pid) 88 #define task_pid_nr(task) ((task)->pid) 89 #define get_pid(x) (x) 90 #define put_pid(x) do { } while (0) 91 #define current_euid() (curthread->td_ucred->cr_uid) 92 93 #define set_task_state(task, x) \ 94 atomic_store_rel_int((volatile int *)&task->state, (x)) 95 #define __set_task_state(task, x) (task->state = (x)) 96 #define set_current_state(x) set_task_state(current, x) 97 #define __set_current_state(x) __set_task_state(current, x) 98 99 static inline void 100 get_task_struct(struct task_struct *task) 101 { 102 atomic_inc(&task->usage); 103 } 104 105 static inline void 106 put_task_struct(struct task_struct *task) 107 { 108 if (atomic_dec_and_test(&task->usage)) 109 linux_free_current(task); 110 } 111 112 #define cond_resched() if (!cold) sched_relinquish(curthread) 113 114 #define yield() kern_yield(PRI_UNCHANGED) 115 #define sched_yield() sched_relinquish(curthread) 116 117 #define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 118 119 bool linux_signal_pending(struct task_struct *task); 120 bool linux_fatal_signal_pending(struct task_struct *task); 121 bool linux_signal_pending_state(long state, struct task_struct *task); 122 void linux_send_sig(int signo, struct task_struct *task); 123 124 #define signal_pending(task) linux_signal_pending(task) 125 #define fatal_signal_pending(task) linux_fatal_signal_pending(task) 126 #define signal_pending_state(state, task) \ 127 linux_signal_pending_state(state, task) 128 #define send_sig(signo, task, priv) do { \ 129 CTASSERT(priv == 0); \ 130 linux_send_sig(signo, task); \ 131 } while (0) 132 133 int linux_schedule_timeout(int timeout); 134 135 #define schedule() \ 136 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT) 137 #define schedule_timeout(timeout) \ 138 linux_schedule_timeout(timeout) 139 #define schedule_timeout_killable(timeout) \ 140 schedule_timeout_uninterruptible(timeout) 141 #define schedule_timeout_interruptible(timeout) ({ \ 142 set_current_state(TASK_INTERRUPTIBLE); \ 143 schedule_timeout(timeout); \ 144 }) 145 #define schedule_timeout_uninterruptible(timeout) ({ \ 146 set_current_state(TASK_UNINTERRUPTIBLE); \ 147 schedule_timeout(timeout); \ 148 }) 149 150 #define io_schedule() schedule() 151 #define io_schedule_timeout(timeout) schedule_timeout(timeout) 152 153 #endif /* _LINUX_SCHED_H_ */ 154