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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 pgalloc_tag_add(struct page *page, struct task_struct *task,
47 unsigned int nr)
48{
49 if (mem_alloc_profiling_enabled()) {
50 union codetag_ref *ref = get_page_tag_ref(page);
51
52 if (ref) {
53 alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr);
54 put_page_tag_ref(ref);
55 }
56 }
57}
58
59static inline void pgalloc_tag_sub(struct page *page, 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_sub(ref, PAGE_SIZE * nr);
66 put_page_tag_ref(ref);
67 }
68 }
69}
70
71static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
72{
73 int i;
74 struct page_ext *first_page_ext;
75 struct page_ext *page_ext;
76 union codetag_ref *ref;
77 struct alloc_tag *tag;
78
79 if (!mem_alloc_profiling_enabled())
80 return;
81
82 first_page_ext = page_ext = page_ext_get(page);
83 if (unlikely(!page_ext))
84 return;
85
86 ref = codetag_ref_from_page_ext(page_ext);
87 if (!ref->ct)
88 goto out;
89
90 tag = ct_to_alloc_tag(ref->ct);
91 page_ext = page_ext_next(page_ext);
92 for (i = 1; i < nr; i++) {
93 /* Set new reference to point to the original tag */
94 alloc_tag_ref_set(codetag_ref_from_page_ext(page_ext), tag);
95 page_ext = page_ext_next(page_ext);
96 }
97out:
98 page_ext_put(first_page_ext);
99}
100
101static inline struct alloc_tag *pgalloc_tag_get(struct page *page)
102{
103 struct alloc_tag *tag = NULL;
104
105 if (mem_alloc_profiling_enabled()) {
106 union codetag_ref *ref = get_page_tag_ref(page);
107
108 alloc_tag_sub_check(ref);
109 if (ref) {
110 if (ref->ct)
111 tag = ct_to_alloc_tag(ref->ct);
112 put_page_tag_ref(ref);
113 }
114 }
115
116 return tag;
117}
118
119static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr)
120{
121 if (mem_alloc_profiling_enabled() && tag)
122 this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr);
123}
124
125#else /* CONFIG_MEM_ALLOC_PROFILING */
126
127static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; }
128static inline void put_page_tag_ref(union codetag_ref *ref) {}
129static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
130 unsigned int nr) {}
131static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {}
132static inline void pgalloc_tag_split(struct page *page, unsigned int nr) {}
133static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; }
134static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {}
135
136#endif /* CONFIG_MEM_ALLOC_PROFILING */
137
138#endif /* _LINUX_PGALLOC_TAG_H */