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 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 */ 47 struct misc_cg { 48 struct cgroup_subsys_state css; 49 struct misc_res res[MISC_CG_RES_TYPES]; 50 }; 51 52 unsigned long misc_cg_res_total_usage(enum misc_res_type type); 53 int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity); 54 int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, 55 unsigned long amount); 56 void 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 */ 68 static 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 */ 81 static 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 */ 90 static 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 98 static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) 99 { 100 return 0; 101 } 102 103 static inline int misc_cg_set_capacity(enum misc_res_type type, 104 unsigned long capacity) 105 { 106 return 0; 107 } 108 109 static 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 } 115 116 static inline void misc_cg_uncharge(enum misc_res_type type, 117 struct misc_cg *cg, 118 unsigned long amount) 119 { 120 } 121 122 static inline struct misc_cg *get_current_misc_cg(void) 123 { 124 return NULL; 125 } 126 127 static inline void put_misc_cg(struct misc_cg *cg) 128 { 129 } 130 131 #endif /* CONFIG_CGROUP_MISC */ 132 #endif /* _MISC_CGROUP_H_ */ 133