arch/arm64/kvm/hyp/include/nvhe/gfp.h

   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[NR_PAGE_ORDERS];
  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 */