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 _LINUXKPI_LINUX_SCHED_H_ 32 #define _LINUXKPI_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 unsigned rcu_section[TS_RCU_TYPE_MAX]; 86 unsigned int fpu_ctx_level; 87 }; 88 89 #define current ({ \ 90 struct thread *__td = curthread; \ 91 linux_set_current(__td); \ 92 ((struct task_struct *)__td->td_lkpi_task); \ 93 }) 94 95 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 96 #define task_pid(task) ((task)->pid) 97 #define task_pid_nr(task) ((task)->pid) 98 #define task_pid_vnr(task) ((task)->pid) 99 #define get_pid(x) (x) 100 #define put_pid(x) do { } while (0) 101 #define current_euid() (curthread->td_ucred->cr_uid) 102 #define task_euid(task) ((task)->task_thread->td_ucred->cr_uid) 103 104 #define get_task_state(task) atomic_read(&(task)->state) 105 #define set_task_state(task, x) atomic_set(&(task)->state, (x)) 106 #define __set_task_state(task, x) ((task)->state.counter = (x)) 107 #define set_current_state(x) set_task_state(current, x) 108 #define __set_current_state(x) __set_task_state(current, x) 109 110 static inline void 111 get_task_struct(struct task_struct *task) 112 { 113 atomic_inc(&task->usage); 114 } 115 116 static inline void 117 put_task_struct(struct task_struct *task) 118 { 119 if (atomic_dec_and_test(&task->usage)) 120 linux_free_current(task); 121 } 122 123 #define cond_resched() do { if (!cold) sched_relinquish(curthread); } while (0) 124 125 #define yield() kern_yield(PRI_UNCHANGED) 126 #define sched_yield() sched_relinquish(curthread) 127 128 #define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 129 130 bool linux_signal_pending(struct task_struct *task); 131 bool linux_fatal_signal_pending(struct task_struct *task); 132 bool linux_signal_pending_state(long state, struct task_struct *task); 133 void linux_send_sig(int signo, struct task_struct *task); 134 135 #define signal_pending(task) linux_signal_pending(task) 136 #define fatal_signal_pending(task) linux_fatal_signal_pending(task) 137 #define signal_pending_state(state, task) \ 138 linux_signal_pending_state(state, task) 139 #define send_sig(signo, task, priv) do { \ 140 CTASSERT((priv) == 0); \ 141 linux_send_sig(signo, task); \ 142 } while (0) 143 144 int linux_schedule_timeout(int timeout); 145 146 static inline void 147 linux_schedule_save_interrupt_value(struct task_struct *task, int value) 148 { 149 task->bsd_interrupt_value = value; 150 } 151 152 bool linux_task_exiting(struct task_struct *task); 153 154 #define current_exiting() \ 155 linux_task_exiting(current) 156 157 static inline int 158 linux_schedule_get_interrupt_value(struct task_struct *task) 159 { 160 int value = task->bsd_interrupt_value; 161 task->bsd_interrupt_value = 0; 162 return (value); 163 } 164 165 static inline void 166 schedule(void) 167 { 168 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT); 169 } 170 171 #define schedule_timeout(timeout) \ 172 linux_schedule_timeout(timeout) 173 #define schedule_timeout_killable(timeout) \ 174 schedule_timeout_interruptible(timeout) 175 #define schedule_timeout_interruptible(timeout) ({ \ 176 set_current_state(TASK_INTERRUPTIBLE); \ 177 schedule_timeout(timeout); \ 178 }) 179 #define schedule_timeout_uninterruptible(timeout) ({ \ 180 set_current_state(TASK_UNINTERRUPTIBLE); \ 181 schedule_timeout(timeout); \ 182 }) 183 184 #define io_schedule() schedule() 185 #define io_schedule_timeout(timeout) schedule_timeout(timeout) 186 187 static inline uint64_t 188 local_clock(void) 189 { 190 struct timespec ts; 191 192 nanotime(&ts); 193 return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec); 194 } 195 196 static inline const char * 197 get_task_comm(char *buf, struct task_struct *task) 198 { 199 200 buf[0] = 0; /* buffer is too small */ 201 return (task->comm); 202 } 203 204 #endif /* _LINUXKPI_LINUX_SCHED_H_ */ 205