1// SPDX-License-Identifier: GPL-2.0
 2// Copyright(c) 2018 Intel Corporation. All rights reserved.
 3#ifndef _MM_SHUFFLE_H
 4#define _MM_SHUFFLE_H
 5#include <linux/jump_label.h>
 6
 7/*
 8 * SHUFFLE_ENABLE is called from the command line enabling path, or by
 9 * platform-firmware enabling that indicates the presence of a
10 * direct-mapped memory-side-cache. SHUFFLE_FORCE_DISABLE is called from
11 * the command line path and overrides any previous or future
12 * SHUFFLE_ENABLE.
13 */
14enum mm_shuffle_ctl {
15	SHUFFLE_ENABLE,
16	SHUFFLE_FORCE_DISABLE,
17};
18
19#define SHUFFLE_ORDER (MAX_ORDER-1)
20
21#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
22DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
23extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl);
24extern void __shuffle_free_memory(pg_data_t *pgdat);
25static inline void shuffle_free_memory(pg_data_t *pgdat)
26{
27	if (!static_branch_unlikely(&page_alloc_shuffle_key))
28		return;
29	__shuffle_free_memory(pgdat);
30}
31
32extern void __shuffle_zone(struct zone *z);
33static inline void shuffle_zone(struct zone *z)
34{
35	if (!static_branch_unlikely(&page_alloc_shuffle_key))
36		return;
37	__shuffle_zone(z);
38}
39
40static inline bool is_shuffle_order(int order)
41{
42	if (!static_branch_unlikely(&page_alloc_shuffle_key))
43		return false;
44	return order >= SHUFFLE_ORDER;
45}
46#else
47static inline void shuffle_free_memory(pg_data_t *pgdat)
48{
49}
50
51static inline void shuffle_zone(struct zone *z)
52{
53}
54
55static inline void page_alloc_shuffle(enum mm_shuffle_ctl ctl)
56{
57}
58
59static inline bool is_shuffle_order(int order)
60{
61	return false;
62}
63#endif
64#endif /* _MM_SHUFFLE_H */