cgroup_dmem.h

 1/* SPDX-License-Identifier: MIT */
 2/*
 3 * Copyright © 2023-2024 Intel Corporation
 4 */
 5
 6#ifndef _CGROUP_DMEM_H
 7#define _CGROUP_DMEM_H
 8
 9#include <linux/types.h>
10#include <linux/llist.h>
11
12struct dmem_cgroup_pool_state;
13
14/* Opaque definition of a cgroup region, used internally */
15struct dmem_cgroup_region;
16
17#if IS_ENABLED(CONFIG_CGROUP_DMEM)
18struct dmem_cgroup_region *dmem_cgroup_register_region(u64 size, const char *name_fmt, ...) __printf(2,3);
19void dmem_cgroup_unregister_region(struct dmem_cgroup_region *region);
20int dmem_cgroup_try_charge(struct dmem_cgroup_region *region, u64 size,
21			   struct dmem_cgroup_pool_state **ret_pool,
22			   struct dmem_cgroup_pool_state **ret_limit_pool);
23void dmem_cgroup_uncharge(struct dmem_cgroup_pool_state *pool, u64 size);
24bool dmem_cgroup_state_evict_valuable(struct dmem_cgroup_pool_state *limit_pool,
25				      struct dmem_cgroup_pool_state *test_pool,
26				      bool ignore_low, bool *ret_hit_low);
27
28void dmem_cgroup_pool_state_put(struct dmem_cgroup_pool_state *pool);
29#else
30static inline __printf(2,3) struct dmem_cgroup_region *
31dmem_cgroup_register_region(u64 size, const char *name_fmt, ...)
32{
33	return NULL;
34}
35
36static inline void dmem_cgroup_unregister_region(struct dmem_cgroup_region *region)
37{ }
38
39static inline int dmem_cgroup_try_charge(struct dmem_cgroup_region *region, u64 size,
40					 struct dmem_cgroup_pool_state **ret_pool,
41					 struct dmem_cgroup_pool_state **ret_limit_pool)
42{
43	*ret_pool = NULL;
44
45	if (ret_limit_pool)
46		*ret_limit_pool = NULL;
47
48	return 0;
49}
50
51static inline void dmem_cgroup_uncharge(struct dmem_cgroup_pool_state *pool, u64 size)
52{ }
53
54static inline
55bool dmem_cgroup_state_evict_valuable(struct dmem_cgroup_pool_state *limit_pool,
56				      struct dmem_cgroup_pool_state *test_pool,
57				      bool ignore_low, bool *ret_hit_low)
58{
59	return true;
60}
61
62static inline void dmem_cgroup_pool_state_put(struct dmem_cgroup_pool_state *pool)
63{ }
64
65#endif
66#endif	/* _CGROUP_DMEM_H */