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/spinlock.h> 49 #include <linux/time.h> 50 51 #include <asm/atomic.h> 52 53 #define MAX_SCHEDULE_TIMEOUT INT_MAX 54 55 #define TASK_RUNNING 0x0000 56 #define TASK_INTERRUPTIBLE 0x0001 57 #define TASK_UNINTERRUPTIBLE 0x0002 58 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 59 #define TASK_WAKING 0x0100 60 #define TASK_PARKED 0x0200 61 62 #define TASK_COMM_LEN (MAXCOMLEN + 1) 63 64 struct work_struct; 65 struct task_struct { 66 struct thread *task_thread; 67 struct mm_struct *mm; 68 linux_task_fn_t *task_fn; 69 void *task_data; 70 int task_ret; 71 atomic_t usage; 72 atomic_t state; 73 atomic_t kthread_flags; 74 pid_t pid; /* BSD thread ID */ 75 const char *comm; 76 void *bsd_ioctl_data; 77 unsigned bsd_ioctl_len; 78 struct completion parked; 79 struct completion exited; 80 #define TS_RCU_TYPE_MAX 2 81 TAILQ_ENTRY(task_struct) rcu_entry[TS_RCU_TYPE_MAX]; 82 int rcu_recurse[TS_RCU_TYPE_MAX]; 83 int bsd_interrupt_value; 84 struct work_struct *work; /* current work struct, if set */ 85 struct task_struct *group_leader; 86 unsigned rcu_section[TS_RCU_TYPE_MAX]; 87 unsigned int fpu_ctx_level; 88 }; 89 90 #define current ({ \ 91 struct thread *__td = curthread; \ 92 linux_set_current(__td); \ 93 ((struct task_struct *)__td->td_lkpi_task); \ 94 }) 95 96 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 97 #define task_pid(task) ((task)->pid) 98 #define task_pid_nr(task) ((task)->pid) 99 #define task_pid_vnr(task) ((task)->pid) 100 #define get_pid(x) (x) 101 #define put_pid(x) do { } while (0) 102 #define current_euid() (curthread->td_ucred->cr_uid) 103 #define task_euid(task) ((task)->task_thread->td_ucred->cr_uid) 104 105 #define get_task_state(task) atomic_read(&(task)->state) 106 #define set_task_state(task, x) atomic_set(&(task)->state, (x)) 107 #define __set_task_state(task, x) ((task)->state.counter = (x)) 108 #define set_current_state(x) set_task_state(current, x) 109 #define __set_current_state(x) __set_task_state(current, x) 110 111 static inline void 112 get_task_struct(struct task_struct *task) 113 { 114 atomic_inc(&task->usage); 115 } 116 117 static inline void 118 put_task_struct(struct task_struct *task) 119 { 120 if (atomic_dec_and_test(&task->usage)) 121 linux_free_current(task); 122 } 123 124 #define cond_resched() do { if (!cold) sched_relinquish(curthread); } while (0) 125 126 #define yield() kern_yield(PRI_UNCHANGED) 127 #define sched_yield() sched_relinquish(curthread) 128 129 #define need_resched() (curthread->td_flags & TDF_NEEDRESCHED) 130 131 static inline int 132 cond_resched_lock(spinlock_t *lock) 133 { 134 135 if (need_resched() == 0) 136 return (0); 137 spin_lock(lock); 138 cond_resched(); 139 spin_unlock(lock); 140 return (1); 141 } 142 143 bool linux_signal_pending(struct task_struct *task); 144 bool linux_fatal_signal_pending(struct task_struct *task); 145 bool linux_signal_pending_state(long state, struct task_struct *task); 146 void linux_send_sig(int signo, struct task_struct *task); 147 148 #define signal_pending(task) linux_signal_pending(task) 149 #define fatal_signal_pending(task) linux_fatal_signal_pending(task) 150 #define signal_pending_state(state, task) \ 151 linux_signal_pending_state(state, task) 152 #define send_sig(signo, task, priv) do { \ 153 CTASSERT((priv) == 0); \ 154 linux_send_sig(signo, task); \ 155 } while (0) 156 157 int linux_schedule_timeout(int timeout); 158 159 static inline void 160 linux_schedule_save_interrupt_value(struct task_struct *task, int value) 161 { 162 task->bsd_interrupt_value = value; 163 } 164 165 bool linux_task_exiting(struct task_struct *task); 166 167 #define current_exiting() \ 168 linux_task_exiting(current) 169 170 static inline int 171 linux_schedule_get_interrupt_value(struct task_struct *task) 172 { 173 int value = task->bsd_interrupt_value; 174 task->bsd_interrupt_value = 0; 175 return (value); 176 } 177 178 static inline void 179 schedule(void) 180 { 181 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT); 182 } 183 184 #define schedule_timeout(timeout) \ 185 linux_schedule_timeout(timeout) 186 #define schedule_timeout_killable(timeout) \ 187 schedule_timeout_interruptible(timeout) 188 #define schedule_timeout_interruptible(timeout) ({ \ 189 set_current_state(TASK_INTERRUPTIBLE); \ 190 schedule_timeout(timeout); \ 191 }) 192 #define schedule_timeout_uninterruptible(timeout) ({ \ 193 set_current_state(TASK_UNINTERRUPTIBLE); \ 194 schedule_timeout(timeout); \ 195 }) 196 197 #define io_schedule() schedule() 198 #define io_schedule_timeout(timeout) schedule_timeout(timeout) 199 200 static inline uint64_t 201 local_clock(void) 202 { 203 struct timespec ts; 204 205 nanotime(&ts); 206 return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec); 207 } 208 209 static inline const char * 210 get_task_comm(char *buf, struct task_struct *task) 211 { 212 213 buf[0] = 0; /* buffer is too small */ 214 return (task->comm); 215 } 216 217 #endif /* _LINUXKPI_LINUX_SCHED_H_ */ 218