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