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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * page allocation tagging
4 */
5#ifndef _LINUX_PGALLOC_TAG_H
6#define _LINUX_PGALLOC_TAG_H
7
8#include <linux/alloc_tag.h>
9
10#ifdef CONFIG_MEM_ALLOC_PROFILING
11
12#include <linux/page_ext.h>
13
14extern struct page_ext_operations page_alloc_tagging_ops;
15
16static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext)
17{
18 return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops);
19}
20
21static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref)
22{
23 return (void *)ref - page_alloc_tagging_ops.offset;
24}
25
26/* Should be called only if mem_alloc_profiling_enabled() */
27static inline union codetag_ref *get_page_tag_ref(struct page *page)
28{
29 if (page) {
30 struct page_ext *page_ext = page_ext_get(page);
31
32 if (page_ext)
33 return codetag_ref_from_page_ext(page_ext);
34 }
35 return NULL;
36}
37
38static inline void put_page_tag_ref(union codetag_ref *ref)
39{
40 if (WARN_ON(!ref))
41 return;
42
43 page_ext_put(page_ext_from_codetag_ref(ref));
44}
45
46static inline void clear_page_tag_ref(struct page *page)
47{
48 if (mem_alloc_profiling_enabled()) {
49 union codetag_ref *ref = get_page_tag_ref(page);
50
51 if (ref) {
52 set_codetag_empty(ref);
53 put_page_tag_ref(ref);
54 }
55 }
56}
57
58static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
59 unsigned int nr)
60{
61 if (mem_alloc_profiling_enabled()) {
62 union codetag_ref *ref = get_page_tag_ref(page);
63
64 if (ref) {
65 alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr);
66 put_page_tag_ref(ref);
67 }
68 }
69}
70
71static inline void pgalloc_tag_sub(struct page *page, unsigned int nr)
72{
73 if (mem_alloc_profiling_enabled()) {
74 union codetag_ref *ref = get_page_tag_ref(page);
75
76 if (ref) {
77 alloc_tag_sub(ref, PAGE_SIZE * nr);
78 put_page_tag_ref(ref);
79 }
80 }
81}
82
83static inline struct alloc_tag *pgalloc_tag_get(struct page *page)
84{
85 struct alloc_tag *tag = NULL;
86
87 if (mem_alloc_profiling_enabled()) {
88 union codetag_ref *ref = get_page_tag_ref(page);
89
90 alloc_tag_sub_check(ref);
91 if (ref) {
92 if (ref->ct)
93 tag = ct_to_alloc_tag(ref->ct);
94 put_page_tag_ref(ref);
95 }
96 }
97
98 return tag;
99}
100
101static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr)
102{
103 if (mem_alloc_profiling_enabled() && tag)
104 this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr);
105}
106
107#else /* CONFIG_MEM_ALLOC_PROFILING */
108
109static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; }
110static inline void put_page_tag_ref(union codetag_ref *ref) {}
111static inline void clear_page_tag_ref(struct page *page) {}
112static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
113 unsigned int nr) {}
114static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {}
115static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; }
116static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {}
117
118#endif /* CONFIG_MEM_ALLOC_PROFILING */
119
120#endif /* _LINUX_PGALLOC_TAG_H */