xref: /openbmc/linux/include/xen/balloon.h (revision 9dd060af)
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
xen_balloon_init(void)35 static inline void xen_balloon_init(void)
36 {
37 }
38 #endif
39 
40 #endif	/* _XEN_BALLOON_H */
41