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 #ifndef _LINUXKPI_LINUX_SCHED_H_ 30 #define _LINUXKPI_LINUX_SCHED_H_ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/proc.h> 35 #include <sys/rtprio.h> 36 #include <sys/sched.h> 37 #include <sys/sleepqueue.h> 38 #include <sys/time.h> 39 40 #include <linux/bitmap.h> 41 #include <linux/compat.h> 42 #include <linux/completion.h> 43 #include <linux/hrtimer.h> 44 #include <linux/mm_types.h> 45 #include <linux/nodemask.h> 46 #include <linux/pid.h> 47 #include <linux/slab.h> 48 #include <linux/string.h> 49 #include <linux/spinlock.h> 50 #include <linux/time.h> 51 52 #include <linux/sched/mm.h> 53 54 #include <asm/atomic.h> 55 56 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 57 58 #define TASK_RUNNING 0x0000 59 #define TASK_INTERRUPTIBLE 0x0001 60 #define TASK_UNINTERRUPTIBLE 0x0002 61 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 62 #define TASK_WAKING 0x0100 63 #define TASK_PARKED 0x0200 64 65 #define TASK_COMM_LEN (MAXCOMLEN + 1) 66 67 struct seq_file; 68 69 struct work_struct; 70 struct task_struct { 71 struct thread *task_thread; 72 struct mm_struct *mm; 73 linux_task_fn_t *task_fn; 74 void *task_data; 75 int task_ret; 76 atomic_t usage; 77 atomic_t state; 78 atomic_t kthread_flags; 79 pid_t pid; /* BSD thread ID */ 80 const char *comm; 81 void *bsd_ioctl_data; 82 unsigned bsd_ioctl_len; 83 struct completion parked; 84 struct completion exited; 85 #define TS_RCU_TYPE_MAX 2 86 TAILQ_ENTRY(task_struct) rcu_entry[TS_RCU_TYPE_MAX]; 87 int rcu_recurse[TS_RCU_TYPE_MAX]; 88 int bsd_interrupt_value; 89 struct work_struct *work; /* current work struct, if set */ 90 struct task_struct *group_leader; 91 unsigned rcu_section[TS_RCU_TYPE_MAX]; 92 unsigned int fpu_ctx_level; 93 }; 94 95 struct task_struct *__lkpi_current(void); 96 #define current (__lkpi_current()) 97 98 #define task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid 99 #define task_pid(task) ((task)->pid) 100 #define task_pid_nr(task) ((task)->pid) 101 #define task_pid_vnr(task) ((task)->pid) 102 #define get_pid(x) (x) 103 #define put_pid(x) do { } while (0) 104 #define current_euid() (curthread->td_ucred->cr_uid) 105 #define task_euid(task) ((task)->task_thread->td_ucred->cr_uid) 106 107 #define get_task_state(task) atomic_read(&(task)->state) 108 #define set_task_state(task, x) atomic_set(&(task)->state, (x)) 109 #define __set_task_state(task, x) ((task)->state.counter = (x)) 110 #define set_current_state(x) set_task_state(current, x) 111 #define __set_current_state(x) __set_task_state(current, x) 112 113 static inline void 114 get_task_struct(struct task_struct *task) 115 { 116 atomic_inc(&task->usage); 117 } 118 119 static inline void 120 put_task_struct(struct task_struct *task) 121 { 122 if (atomic_dec_and_test(&task->usage)) 123 linux_free_current(task); 124 } 125 126 #define cond_resched() do { if (!cold) sched_relinquish(curthread); } while (0) 127 128 #define yield() kern_yield(PRI_UNCHANGED) 129 #define sched_yield() sched_relinquish(curthread) 130 131 #define need_resched() (curthread->td_owepreempt || \ 132 td_ast_pending(curthread, TDA_SCHED)) 133 134 static inline int 135 cond_resched_lock(spinlock_t *lock) 136 { 137 138 if (need_resched() == 0) 139 return (0); 140 spin_unlock(lock); 141 cond_resched(); 142 spin_lock(lock); 143 return (1); 144 } 145 146 bool linux_signal_pending(struct task_struct *task); 147 bool linux_fatal_signal_pending(struct task_struct *task); 148 bool linux_signal_pending_state(long state, struct task_struct *task); 149 void linux_send_sig(int signo, struct task_struct *task); 150 151 #define signal_pending(task) linux_signal_pending(task) 152 #define fatal_signal_pending(task) linux_fatal_signal_pending(task) 153 #define signal_pending_state(state, task) \ 154 linux_signal_pending_state(state, task) 155 #define send_sig(signo, task, priv) do { \ 156 CTASSERT((priv) == 0); \ 157 linux_send_sig(signo, task); \ 158 } while (0) 159 160 long linux_schedule_timeout(long timeout); 161 162 static inline void 163 linux_schedule_save_interrupt_value(struct task_struct *task, int value) 164 { 165 task->bsd_interrupt_value = value; 166 } 167 168 bool linux_task_exiting(struct task_struct *task); 169 170 #define current_exiting() \ 171 linux_task_exiting(current) 172 173 static inline int 174 linux_schedule_get_interrupt_value(struct task_struct *task) 175 { 176 int value = task->bsd_interrupt_value; 177 task->bsd_interrupt_value = 0; 178 return (value); 179 } 180 181 static inline void 182 schedule(void) 183 { 184 (void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT); 185 } 186 187 #define schedule_timeout(timeout) \ 188 linux_schedule_timeout(timeout) 189 #define schedule_timeout_killable(timeout) \ 190 schedule_timeout_interruptible(timeout) 191 #define schedule_timeout_interruptible(timeout) ({ \ 192 set_current_state(TASK_INTERRUPTIBLE); \ 193 schedule_timeout(timeout); \ 194 }) 195 #define schedule_timeout_uninterruptible(timeout) ({ \ 196 set_current_state(TASK_UNINTERRUPTIBLE); \ 197 schedule_timeout(timeout); \ 198 }) 199 200 #define io_schedule() schedule() 201 #define io_schedule_timeout(timeout) schedule_timeout(timeout) 202 203 static inline uint64_t 204 local_clock(void) 205 { 206 struct timespec ts; 207 208 nanotime(&ts); 209 return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec); 210 } 211 212 static inline const char * 213 get_task_comm(char *buf, struct task_struct *task) 214 { 215 216 buf[0] = 0; /* buffer is too small */ 217 return (task->comm); 218 } 219 220 static inline void 221 sched_set_fifo(struct task_struct *t) 222 { 223 struct rtprio rtp; 224 225 rtp.prio = (RTP_PRIO_MIN + RTP_PRIO_MAX) / 2; 226 rtp.type = RTP_PRIO_FIFO; 227 rtp_to_pri(&rtp, t->task_thread); 228 } 229 230 static inline void 231 sched_set_fifo_low(struct task_struct *t) 232 { 233 struct rtprio rtp; 234 235 rtp.prio = RTP_PRIO_MAX; /* lowest priority */ 236 rtp.type = RTP_PRIO_FIFO; 237 rtp_to_pri(&rtp, t->task_thread); 238 } 239 240 #endif /* _LINUXKPI_LINUX_SCHED_H_ */ 241