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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 */
14enum misc_res_type {
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
21 MISC_CG_RES_TYPES
22};
23
24struct 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 */
36struct misc_res {
37 unsigned long max;
38 atomic_long_t usage;
39 bool failed;
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 */
47struct misc_cg {
48 struct cgroup_subsys_state css;
49 struct misc_res res[MISC_CG_RES_TYPES];
50};
51
52unsigned long misc_cg_res_total_usage(enum misc_res_type type);
53int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity);
54int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg,
55 unsigned long amount);
56void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg,
57 unsigned long amount);
58
59/**
60 * css_misc() - Get misc cgroup from the css.
61 * @css: cgroup subsys state object.
62 *
63 * Context: Any context.
64 * Return:
65 * * %NULL - If @css is null.
66 * * struct misc_cg* - misc cgroup pointer of the passed css.
67 */
68static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css)
69{
70 return css ? container_of(css, struct misc_cg, css) : NULL;
71}
72
73/*
74 * get_current_misc_cg() - Find and get the misc cgroup of the current task.
75 *
76 * Returned cgroup has its ref count increased by 1. Caller must call
77 * put_misc_cg() to return the reference.
78 *
79 * Return: Misc cgroup to which the current task belongs to.
80 */
81static inline struct misc_cg *get_current_misc_cg(void)
82{
83 return css_misc(task_get_css(current, misc_cgrp_id));
84}
85
86/*
87 * put_misc_cg() - Put the misc cgroup and reduce its ref count.
88 * @cg - cgroup to put.
89 */
90static inline void put_misc_cg(struct misc_cg *cg)
91{
92 if (cg)
93 css_put(&cg->css);
94}
95
96#else /* !CONFIG_CGROUP_MISC */
97
98static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type)
99{
100 return 0;
101}
102
103static inline int misc_cg_set_capacity(enum misc_res_type type,
104 unsigned long capacity)
105{
106 return 0;
107}
108
109static inline int misc_cg_try_charge(enum misc_res_type type,
110 struct misc_cg *cg,
111 unsigned long amount)
112{
113 return 0;
114}
115
116static inline void misc_cg_uncharge(enum misc_res_type type,
117 struct misc_cg *cg,
118 unsigned long amount)
119{
120}
121
122static inline struct misc_cg *get_current_misc_cg(void)
123{
124 return NULL;
125}
126
127static inline void put_misc_cg(struct misc_cg *cg)
128{
129}
130
131#endif /* CONFIG_CGROUP_MISC */
132#endif /* _MISC_CGROUP_H_ */