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 UINT_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 int max_order; 23 }; 24 25 static inline void hyp_page_ref_inc(struct hyp_page *p) 26 { 27 struct hyp_pool *pool = hyp_page_to_pool(p); 28 29 hyp_spin_lock(&pool->lock); 30 p->refcount++; 31 hyp_spin_unlock(&pool->lock); 32 } 33 34 static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) 35 { 36 struct hyp_pool *pool = hyp_page_to_pool(p); 37 int ret; 38 39 hyp_spin_lock(&pool->lock); 40 p->refcount--; 41 ret = (p->refcount == 0); 42 hyp_spin_unlock(&pool->lock); 43 44 return ret; 45 } 46 47 static inline void hyp_set_page_refcounted(struct hyp_page *p) 48 { 49 struct hyp_pool *pool = hyp_page_to_pool(p); 50 51 hyp_spin_lock(&pool->lock); 52 if (p->refcount) { 53 hyp_spin_unlock(&pool->lock); 54 hyp_panic(); 55 } 56 p->refcount = 1; 57 hyp_spin_unlock(&pool->lock); 58 } 59 60 /* Allocation */ 61 void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order); 62 void hyp_get_page(void *addr); 63 void hyp_put_page(void *addr); 64 65 /* Used pages cannot be freed */ 66 int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, 67 unsigned int reserved_pages); 68 #endif /* __KVM_HYP_GFP_H */ 69