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132 lines
3.0 KiB
132 lines
3.0 KiB
/* 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 <[email protected]> |
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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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bool failed; |
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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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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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