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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. | |
62157e11 | 34 | * @events: Number of times, the resource limit exceeded. |
a72232ea VS |
35 | */ |
36 | struct misc_res { | |
32bf85c6 HH |
37 | u64 max; |
38 | atomic64_t usage; | |
39 | atomic64_t events; | |
a72232ea VS |
40 | }; |
41 | ||
42 | /** | |
43 | * struct misc_cg - Miscellaneous controller's cgroup structure. | |
44 | * @css: cgroup subsys state object. | |
62157e11 | 45 | * @events_file: Handle for the misc resources events file. |
a72232ea VS |
46 | * @res: Array of misc resources usage in the cgroup. |
47 | */ | |
48 | struct misc_cg { | |
49 | struct cgroup_subsys_state css; | |
f279294b CX |
50 | |
51 | /* misc.events */ | |
52 | struct cgroup_file events_file; | |
53 | ||
a72232ea VS |
54 | struct misc_res res[MISC_CG_RES_TYPES]; |
55 | }; | |
56 | ||
32bf85c6 HH |
57 | u64 misc_cg_res_total_usage(enum misc_res_type type); |
58 | int misc_cg_set_capacity(enum misc_res_type type, u64 capacity); | |
59 | int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount); | |
60 | void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount); | |
a72232ea VS |
61 | |
62 | /** | |
63 | * css_misc() - Get misc cgroup from the css. | |
64 | * @css: cgroup subsys state object. | |
65 | * | |
66 | * Context: Any context. | |
67 | * Return: | |
68 | * * %NULL - If @css is null. | |
69 | * * struct misc_cg* - misc cgroup pointer of the passed css. | |
70 | */ | |
71 | static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css) | |
72 | { | |
73 | return css ? container_of(css, struct misc_cg, css) : NULL; | |
74 | } | |
75 | ||
76 | /* | |
77 | * get_current_misc_cg() - Find and get the misc cgroup of the current task. | |
78 | * | |
79 | * Returned cgroup has its ref count increased by 1. Caller must call | |
80 | * put_misc_cg() to return the reference. | |
81 | * | |
82 | * Return: Misc cgroup to which the current task belongs to. | |
83 | */ | |
84 | static inline struct misc_cg *get_current_misc_cg(void) | |
85 | { | |
86 | return css_misc(task_get_css(current, misc_cgrp_id)); | |
87 | } | |
88 | ||
89 | /* | |
90 | * put_misc_cg() - Put the misc cgroup and reduce its ref count. | |
91 | * @cg - cgroup to put. | |
92 | */ | |
93 | static inline void put_misc_cg(struct misc_cg *cg) | |
94 | { | |
95 | if (cg) | |
96 | css_put(&cg->css); | |
97 | } | |
98 | ||
99 | #else /* !CONFIG_CGROUP_MISC */ | |
100 | ||
32bf85c6 | 101 | static inline u64 misc_cg_res_total_usage(enum misc_res_type type) |
a72232ea VS |
102 | { |
103 | return 0; | |
104 | } | |
105 | ||
32bf85c6 | 106 | static inline int misc_cg_set_capacity(enum misc_res_type type, u64 capacity) |
a72232ea VS |
107 | { |
108 | return 0; | |
109 | } | |
110 | ||
111 | static inline int misc_cg_try_charge(enum misc_res_type type, | |
112 | struct misc_cg *cg, | |
32bf85c6 | 113 | u64 amount) |
a72232ea VS |
114 | { |
115 | return 0; | |
116 | } | |
117 | ||
118 | static inline void misc_cg_uncharge(enum misc_res_type type, | |
119 | struct misc_cg *cg, | |
32bf85c6 | 120 | u64 amount) |
a72232ea VS |
121 | { |
122 | } | |
123 | ||
124 | static inline struct misc_cg *get_current_misc_cg(void) | |
125 | { | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static inline void put_misc_cg(struct misc_cg *cg) | |
130 | { | |
131 | } | |
132 | ||
133 | #endif /* CONFIG_CGROUP_MISC */ | |
134 | #endif /* _MISC_CGROUP_H_ */ |