gfp.h

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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __KVM_HYP_GFP_H
#define __KVM_HYP_GFP_H
 
#include <linux/list.h>
 
#include <nvhe/memory.h>
#include <nvhe/spinlock.h>
 
#define HYP_NO_ORDER    USHRT_MAX
 
struct hyp_pool {
    /*
     * Spinlock protecting concurrent changes to the memory pool as well as
     * the struct hyp_page of the pool's pages until we have a proper atomic
     * API at EL2.
     */
    hyp_spinlock_t lock;
    struct list_head free_area[NR_PAGE_ORDERS];
    phys_addr_t range_start;
    phys_addr_t range_end;
    unsigned short max_order;
};
 
/* Allocation */
void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order);
void hyp_split_page(struct hyp_page *page);
void hyp_get_page(struct hyp_pool *pool, void *addr);
void hyp_put_page(struct hyp_pool *pool, void *addr);
 
/* Used pages cannot be freed */
int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
          unsigned int reserved_pages);
#endif /* __KVM_HYP_GFP_H */