137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Miscellaneous cgroup controller.
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*
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* Copyright 2020 Google LLC
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* Author: Vipin Sharma <vipinsh@google.com>
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*/
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#ifndef _MISC_CGROUP_H_
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#define _MISC_CGROUP_H_
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/**
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* Types of misc cgroup entries supported by the host.
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*/
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enum misc_res_type {
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#ifdef CONFIG_KVM_AMD_SEV
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/* AMD SEV ASIDs resource */
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MISC_CG_RES_SEV,
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/* AMD SEV-ES ASIDs resource */
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MISC_CG_RES_SEV_ES,
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#endif
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MISC_CG_RES_TYPES
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};
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struct misc_cg;
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#ifdef CONFIG_CGROUP_MISC
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#include <linux/cgroup.h>
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/**
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* struct misc_res: Per cgroup per misc type resource
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* @max: Maximum limit on the resource.
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* @usage: Current usage of the resource.
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* @failed: True if charged failed for the resource in a cgroup.
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*/
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struct misc_res {
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unsigned long max;
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atomic_long_t usage;
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atomic_long_t events;
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};
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/**
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* struct misc_cg - Miscellaneous controller's cgroup structure.
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* @css: cgroup subsys state object.
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* @res: Array of misc resources usage in the cgroup.
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*/
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struct misc_cg {
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struct cgroup_subsys_state css;
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/* misc.events */
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struct cgroup_file events_file;
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struct misc_res res[MISC_CG_RES_TYPES];
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};
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unsigned long misc_cg_res_total_usage(enum misc_res_type type);
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int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity);
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int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg,
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unsigned long amount);
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void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg,
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unsigned long amount);
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/**
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* css_misc() - Get misc cgroup from the css.
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* @css: cgroup subsys state object.
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*
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* Context: Any context.
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* Return:
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* * %NULL - If @css is null.
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* * struct misc_cg* - misc cgroup pointer of the passed css.
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*/
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static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css)
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{
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return css ? container_of(css, struct misc_cg, css) : NULL;
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}
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/*
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* get_current_misc_cg() - Find and get the misc cgroup of the current task.
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*
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* Returned cgroup has its ref count increased by 1. Caller must call
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* put_misc_cg() to return the reference.
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*
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* Return: Misc cgroup to which the current task belongs to.
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*/
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static inline struct misc_cg *get_current_misc_cg(void)
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{
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return css_misc(task_get_css(current, misc_cgrp_id));
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}
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/*
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* put_misc_cg() - Put the misc cgroup and reduce its ref count.
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* @cg - cgroup to put.
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*/
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static inline void put_misc_cg(struct misc_cg *cg)
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{
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if (cg)
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css_put(&cg->css);
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}
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#else /* !CONFIG_CGROUP_MISC */
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static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type)
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{
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return 0;
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}
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static inline int misc_cg_set_capacity(enum misc_res_type type,
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unsigned long capacity)
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{
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return 0;
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}
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static inline int misc_cg_try_charge(enum misc_res_type type,
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struct misc_cg *cg,
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unsigned long amount)
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{
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return 0;
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}
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static inline void misc_cg_uncharge(enum misc_res_type type,
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struct misc_cg *cg,
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unsigned long amount)
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{
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}
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static inline struct misc_cg *get_current_misc_cg(void)
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{
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return NULL;
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}
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static inline void put_misc_cg(struct misc_cg *cg)
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{
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}
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#endif /* CONFIG_CGROUP_MISC */
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#endif /* _MISC_CGROUP_H_ */
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