1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 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 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 41 42 #define TASK_RUNNING 0 43 #define TASK_INTERRUPTIBLE 1 44 #define TASK_UNINTERRUPTIBLE 2 45 #define TASK_DEAD 64 46 #define TASK_WAKEKILL 128 47 #define TASK_WAKING 256 48 49 #define TASK_SHOULD_STOP 1 50 #define TASK_STOPPED 2 51 52 /* 53 * A task_struct is only provided for threads created by kthread() and 54 * file operation callbacks. 55 * 56 * Using these routines outside the above mentioned contexts will 57 * cause panics because no task_struct is assigned and td_retval[1] is 58 * overwritten by syscalls. 59 */ 60 struct task_struct { 61 struct thread *task_thread; 62 int (*task_fn)(void *data); 63 void *task_data; 64 int task_ret; 65 int state; 66 int should_stop; 67 pid_t pid; 68 const char *comm; 69 void *bsd_ioctl_data; 70 unsigned bsd_ioctl_len; 71 }; 72 73 #define current task_struct_get(curthread) 74 #define task_struct_get(x) ((struct task_struct *)(uintptr_t)(x)->td_retval[1]) 75 #define task_struct_fill(x, y) do { \ 76 (y)->task_thread = (x); \ 77 (y)->comm = (x)->td_name; \ 78 (y)->pid = (x)->td_tid; \ 79 } while (0) 80 #define task_struct_set(x, y) (x)->td_retval[1] = (uintptr_t)(y) 81 82 /* ensure the task_struct pointer fits into the td_retval[1] field */ 83 CTASSERT(sizeof(((struct thread *)0)->td_retval[1]) >= sizeof(uintptr_t)); 84 85 #define set_current_state(x) \ 86 atomic_store_rel_int((volatile int *)¤t->state, (x)) 87 #define __set_current_state(x) current->state = (x) 88 89 90 #define schedule() \ 91 do { \ 92 void *c; \ 93 \ 94 if (cold) \ 95 break; \ 96 c = curthread; \ 97 sleepq_lock(c); \ 98 if (current->state == TASK_INTERRUPTIBLE || \ 99 current->state == TASK_UNINTERRUPTIBLE) { \ 100 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \ 101 sleepq_wait(c, 0); \ 102 } else { \ 103 sleepq_release(c); \ 104 sched_relinquish(curthread); \ 105 } \ 106 } while (0) 107 108 #define wake_up_process(x) \ 109 do { \ 110 int wakeup_swapper; \ 111 void *c; \ 112 \ 113 c = (x)->task_thread; \ 114 sleepq_lock(c); \ 115 (x)->state = TASK_RUNNING; \ 116 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \ 117 sleepq_release(c); \ 118 if (wakeup_swapper) \ 119 kick_proc0(); \ 120 } while (0) 121 122 #define cond_resched() if (!cold) sched_relinquish(curthread) 123 124 #define sched_yield() sched_relinquish(curthread) 125 126 static inline long 127 schedule_timeout(signed long timeout) 128 { 129 if (timeout < 0) 130 return 0; 131 132 pause("lstim", timeout); 133 134 return 0; 135 } 136 137 #endif /* _LINUX_SCHED_H_ */ 138