1/*-
2 * Copyright (c) 2017 Mellanox Technologies, Ltd.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#ifndef _LINUX_MM_TYPES_H_
30#define	_LINUX_MM_TYPES_H_
31
32#include <linux/types.h>
33#include <linux/page.h>
34#include <linux/rwsem.h>
35
36#include <asm/atomic.h>
37
38typedef int vm_fault_t;
39
40struct vm_area_struct;
41struct task_struct;
42
43struct mm_struct {
44	struct vm_area_struct *mmap;
45	atomic_t mm_count;
46	atomic_t mm_users;
47	size_t pinned_vm;
48	struct rw_semaphore mmap_sem;
49};
50
51extern void linux_mm_dtor(struct mm_struct *mm);
52
53static inline void
54mmdrop(struct mm_struct *mm)
55{
56	if (__predict_false(atomic_dec_and_test(&mm->mm_count)))
57		linux_mm_dtor(mm);
58}
59
60static inline bool
61mmget_not_zero(struct mm_struct *mm)
62{
63	return (atomic_inc_not_zero(&mm->mm_users));
64}
65
66static inline void
67mmput(struct mm_struct *mm)
68{
69	if (__predict_false(atomic_dec_and_test(&mm->mm_users)))
70		mmdrop(mm);
71}
72
73static inline void
74mmgrab(struct mm_struct *mm)
75{
76	atomic_inc(&mm->mm_count);
77}
78
79extern struct mm_struct *linux_get_task_mm(struct task_struct *);
80#define	get_task_mm(task) linux_get_task_mm(task)
81
82#endif					/* _LINUX_MM_TYPES_H_ */
83