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