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 
12 struct 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[MAX_ORDER];
20 	phys_addr_t range_start;
21 	phys_addr_t range_end;
22 	unsigned short max_order;
23 };
24 
25 /* Allocation */
26 void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order);
27 void hyp_split_page(struct hyp_page *page);
28 void hyp_get_page(struct hyp_pool *pool, void *addr);
29 void hyp_put_page(struct hyp_pool *pool, void *addr);
30 
31 /* Used pages cannot be freed */
32 int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
33 		  unsigned int reserved_pages);
34 #endif /* __KVM_HYP_GFP_H */
35