1/* SPDX-License-Identifier: GPL-2.0-only */
 2#ifndef __KVM_HYP_GFP_H
 3#define __KVM_HYP_GFP_H
 4
 5#include <linux/list.h>
 6
 7#include <nvhe/memory.h>
 8#include <nvhe/spinlock.h>
 9
10#define HYP_NO_ORDER	USHRT_MAX
11
12struct hyp_pool {
13	/*
14	 * Spinlock protecting concurrent changes to the memory pool as well as
15	 * the struct hyp_page of the pool's pages until we have a proper atomic
16	 * API at EL2.
17	 */
18	hyp_spinlock_t lock;
19	struct list_head free_area[NR_PAGE_ORDERS];
20	phys_addr_t range_start;
21	phys_addr_t range_end;
22	unsigned short max_order;
23};
24
25/* Allocation */
26void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order);
27void hyp_split_page(struct hyp_page *page);
28void hyp_get_page(struct hyp_pool *pool, void *addr);
29void hyp_put_page(struct hyp_pool *pool, void *addr);
30
31/* Used pages cannot be freed */
32int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
33		  unsigned int reserved_pages);
34#endif /* __KVM_HYP_GFP_H */