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/types.h> 41 #include <linux/compat.h> 42 #include <linux/completion.h> 43 #include <linux/pid.h> 44 #include <linux/slab.h> 45 #include <linux/mm_types.h> 46 #include <linux/string.h> 47 #include <linux/bitmap.h> 48 49 #include <asm/atomic.h> 50 51 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 52 53 #define TASK_RUNNING 0 54 #define TASK_INTERRUPTIBLE 1 55 #define TASK_UNINTERRUPTIBLE 2 56 #define TASK_DEAD 64 57 #define TASK_WAKEKILL 128 58 #define TASK_WAKING 256 59 60 struct task_struct { 61 struct thread *task_thread; 62 struct mm_struct *mm; 63 linux_task_fn_t *task_fn; 64 void *task_data; 65 int task_ret; 66 atomic_t usage; 67 int state; 68 atomic_t kthread_flags; 69 pid_t pid; /* BSD thread ID */ 70 const char *comm; 71 void *bsd_ioctl_data; 72 unsigned bsd_ioctl_len; 73 struct completion parked; 74 struct completion exited; 75 }; 76 77 #define current ((struct task_struct *)curthread->td_lkpi_task) 78 79 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 80 #define task_pid(task) ((task)->pid) 81 #define task_pid_nr(task) ((task)->pid) 82 #define get_pid(x) (x) 83 #define put_pid(x) do { } while (0) 84 #define current_euid() (curthread->td_ucred->cr_uid) 85 86 #define set_current_state(x) \ 87 atomic_store_rel_int((volatile int *)¤t->state, (x)) 88 #define __set_current_state(x) current->state = (x) 89 90 static inline void 91 get_task_struct(struct task_struct *task) 92 { 93 atomic_inc(&task->usage); 94 } 95 96 static inline void 97 put_task_struct(struct task_struct *task) 98 { 99 if (atomic_dec_and_test(&task->usage)) 100 linux_free_current(task); 101 } 102 103 #define schedule() \ 104 do { \ 105 void *c; \ 106 \ 107 if (cold || SCHEDULER_STOPPED()) \ 108 break; \ 109 c = curthread; \ 110 sleepq_lock(c); \ 111 if (current->state == TASK_INTERRUPTIBLE || \ 112 current->state == TASK_UNINTERRUPTIBLE) { \ 113 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \ 114 sleepq_wait(c, 0); \ 115 } else { \ 116 sleepq_release(c); \ 117 sched_relinquish(curthread); \ 118 } \ 119 } while (0) 120 121 #define wake_up_process(x) \ 122 do { \ 123 int wakeup_swapper; \ 124 void *c; \ 125 \ 126 c = (x)->task_thread; \ 127 sleepq_lock(c); \ 128 (x)->state = TASK_RUNNING; \ 129 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \ 130 sleepq_release(c); \ 131 if (wakeup_swapper) \ 132 kick_proc0(); \ 133 } while (0) 134 135 #define cond_resched() if (!cold) sched_relinquish(curthread) 136 137 #define sched_yield() sched_relinquish(curthread) 138 139 static inline long 140 schedule_timeout(signed long timeout) 141 { 142 if (timeout < 0) 143 return 0; 144 145 pause("lstim", timeout); 146 147 return 0; 148 } 149 150 #define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 151 152 #endif /* _LINUX_SCHED_H_ */ 153