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 { 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 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; 39 atomic_long_t events; 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; 49 50 /* misc.events */ 51 struct cgroup_file events_file; 52 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 */ 101 102 static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) 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_ */ 137