/* SPDX-License-Identifier: GPL-2.0 */
/******************************************************************************
 * Xen balloon functionality
 */
#ifndef _XEN_BALLOON_H
#define _XEN_BALLOON_H

#define RETRY_UNLIMITED 0

struct balloon_stats {
        /* We aim for 'current allocation' == 'target allocation'. */
        unsigned long current_pages;
        unsigned long target_pages;
        unsigned long target_unpopulated;
        /* Number of pages in high- and low-memory balloons. */
        unsigned long balloon_low;
        unsigned long balloon_high;
        unsigned long total_pages;
        unsigned long schedule_delay;
        unsigned long max_schedule_delay;
        unsigned long retry_count;
        unsigned long max_retry_count;
};

extern struct balloon_stats balloon_stats;

void balloon_set_new_target(unsigned long target);

int xen_alloc_ballooned_pages(unsigned int nr_pages, struct page **pages);
void xen_free_ballooned_pages(unsigned int nr_pages, struct page **pages);

#ifdef CONFIG_XEN_BALLOON
void xen_balloon_init(void);
#else
static inline void xen_balloon_init(void)
{
}
#endif

#endif  /* _XEN_BALLOON_H */