1 /* SPDX-License-Identifier: GPL-2.0 */
2 /******************************************************************************
3 * Xen balloon functionality
4 */
5 #ifndef _XEN_BALLOON_H
6 #define _XEN_BALLOON_H
7
8 #define RETRY_UNLIMITED 0
9
10 struct balloon_stats {
11 /* We aim for 'current allocation' == 'target allocation'. */
12 unsigned long current_pages;
13 unsigned long target_pages;
14 unsigned long target_unpopulated;
15 /* Number of pages in high- and low-memory balloons. */
16 unsigned long balloon_low;
17 unsigned long balloon_high;
18 unsigned long total_pages;
19 unsigned long schedule_delay;
20 unsigned long max_schedule_delay;
21 unsigned long retry_count;
22 unsigned long max_retry_count;
23 };
24
25 extern struct balloon_stats balloon_stats;
26
27 void balloon_set_new_target(unsigned long target);
28
29 int xen_alloc_ballooned_pages(unsigned int nr_pages, struct page **pages);
30 void xen_free_ballooned_pages(unsigned int nr_pages, struct page **pages);
31
32 #ifdef CONFIG_XEN_BALLOON
33 void xen_balloon_init(void);
34 #else
35 static inline void xen_balloon_init(void)
36 {
37 }
38 #endif
39
40 #endif /* _XEN_BALLOON_H */
41
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