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a72232ea VS |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Miscellaneous cgroup controller. | |
4 | * | |
5 | * Copyright 2020 Google LLC | |
6 | * Author: Vipin Sharma <vipinsh@google.com> | |
7 | */ | |
8 | #ifndef _MISC_CGROUP_H_ | |
9 | #define _MISC_CGROUP_H_ | |
10 | ||
11 | /** | |
12 | * Types of misc cgroup entries supported by the host. | |
13 | */ | |
14 | enum misc_res_type { | |
7aef27f0 VS |
15 | #ifdef CONFIG_KVM_AMD_SEV |
16 | /* AMD SEV ASIDs resource */ | |
17 | MISC_CG_RES_SEV, | |
18 | /* AMD SEV-ES ASIDs resource */ | |
19 | MISC_CG_RES_SEV_ES, | |
20 | #endif | |
a72232ea VS |
21 | MISC_CG_RES_TYPES |
22 | }; | |
23 | ||
24 | struct misc_cg; | |
25 | ||
26 | #ifdef CONFIG_CGROUP_MISC | |
27 | ||
28 | #include <linux/cgroup.h> | |
29 | ||
30 | /** | |
31 | * struct misc_res: Per cgroup per misc type resource | |
32 | * @max: Maximum limit on the resource. | |
33 | * @usage: Current usage of the resource. | |
34 | * @failed: True if charged failed for the resource in a cgroup. | |
35 | */ | |
36 | struct misc_res { | |
37 | unsigned long max; | |
38 | atomic_long_t usage; | |
f279294b | 39 | atomic_long_t events; |
a72232ea VS |
40 | }; |
41 | ||
42 | /** | |
43 | * struct misc_cg - Miscellaneous controller's cgroup structure. | |
44 | * @css: cgroup subsys state object. | |
45 | * @res: Array of misc resources usage in the cgroup. | |
46 | */ | |
47 | struct misc_cg { | |
48 | struct cgroup_subsys_state css; | |
f279294b CX |
49 | |
50 | /* misc.events */ | |
51 | struct cgroup_file events_file; | |
52 | ||
a72232ea VS |
53 | struct misc_res res[MISC_CG_RES_TYPES]; |
54 | }; | |
55 | ||
56 | unsigned long misc_cg_res_total_usage(enum misc_res_type type); | |
57 | int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity); | |
58 | int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, | |
59 | unsigned long amount); | |
60 | void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, | |
61 | unsigned long amount); | |
62 | ||
63 | /** | |
64 | * css_misc() - Get misc cgroup from the css. | |
65 | * @css: cgroup subsys state object. | |
66 | * | |
67 | * Context: Any context. | |
68 | * Return: | |
69 | * * %NULL - If @css is null. | |
70 | * * struct misc_cg* - misc cgroup pointer of the passed css. | |
71 | */ | |
72 | static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css) | |
73 | { | |
74 | return css ? container_of(css, struct misc_cg, css) : NULL; | |
75 | } | |
76 | ||
77 | /* | |
78 | * get_current_misc_cg() - Find and get the misc cgroup of the current task. | |
79 | * | |
80 | * Returned cgroup has its ref count increased by 1. Caller must call | |
81 | * put_misc_cg() to return the reference. | |
82 | * | |
83 | * Return: Misc cgroup to which the current task belongs to. | |
84 | */ | |
85 | static inline struct misc_cg *get_current_misc_cg(void) | |
86 | { | |
87 | return css_misc(task_get_css(current, misc_cgrp_id)); | |
88 | } | |
89 | ||
90 | /* | |
91 | * put_misc_cg() - Put the misc cgroup and reduce its ref count. | |
92 | * @cg - cgroup to put. | |
93 | */ | |
94 | static inline void put_misc_cg(struct misc_cg *cg) | |
95 | { | |
96 | if (cg) | |
97 | css_put(&cg->css); | |
98 | } | |
99 | ||
100 | #else /* !CONFIG_CGROUP_MISC */ | |
101 | ||
dd3f4e49 | 102 | static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) |
a72232ea VS |
103 | { |
104 | return 0; | |
105 | } | |
106 | ||
107 | static inline int misc_cg_set_capacity(enum misc_res_type type, | |
108 | unsigned long capacity) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static inline int misc_cg_try_charge(enum misc_res_type type, | |
114 | struct misc_cg *cg, | |
115 | unsigned long amount) | |
116 | { | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static inline void misc_cg_uncharge(enum misc_res_type type, | |
121 | struct misc_cg *cg, | |
122 | unsigned long amount) | |
123 | { | |
124 | } | |
125 | ||
126 | static inline struct misc_cg *get_current_misc_cg(void) | |
127 | { | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | static inline void put_misc_cg(struct misc_cg *cg) | |
132 | { | |
133 | } | |
134 | ||
135 | #endif /* CONFIG_CGROUP_MISC */ | |
136 | #endif /* _MISC_CGROUP_H_ */ |