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
27 #ifndef _LINUXKPI_LINUX_MM_TYPES_H_
28 #define _LINUXKPI_LINUX_MM_TYPES_H_
29
30 #include <linux/types.h>
31 #include <linux/page.h>
32 #include <linux/rbtree.h>
33 #include <linux/rwsem.h>
34
35 #include <asm/atomic.h>
36
37 typedef int vm_fault_t;
38
39 struct vm_area_struct;
40 struct task_struct;
41
42 struct mm_struct {
43 struct vm_area_struct *mmap;
44 atomic_t mm_count;
45 atomic_t mm_users;
46 size_t pinned_vm;
47 /* Renamed to mmap_lock in v5.8 */
48 struct rw_semaphore mmap_sem;
49 };
50
51 extern void linux_mm_dtor(struct mm_struct *mm);
52
53 static inline void
mmdrop(struct mm_struct * mm)54 mmdrop(struct mm_struct *mm)
55 {
56 if (__predict_false(atomic_dec_and_test(&mm->mm_count)))
57 linux_mm_dtor(mm);
58 }
59
60 static inline bool
mmget_not_zero(struct mm_struct * mm)61 mmget_not_zero(struct mm_struct *mm)
62 {
63 return (atomic_inc_not_zero(&mm->mm_users));
64 }
65
66 static inline void
mmput(struct mm_struct * mm)67 mmput(struct mm_struct *mm)
68 {
69 if (__predict_false(atomic_dec_and_test(&mm->mm_users)))
70 mmdrop(mm);
71 }
72
73 static inline void
mmgrab(struct mm_struct * mm)74 mmgrab(struct mm_struct *mm)
75 {
76 atomic_inc(&mm->mm_count);
77 }
78
79 extern struct mm_struct *linux_get_task_mm(struct task_struct *);
80 #define get_task_mm(task) linux_get_task_mm(task)
81
82 #endif /* _LINUXKPI_LINUX_MM_TYPES_H_ */
83