1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun #ifndef __KVM_HYP_GFP_H 3*4882a593Smuzhiyun #define __KVM_HYP_GFP_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/list.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <nvhe/memory.h> 8*4882a593Smuzhiyun #include <nvhe/spinlock.h> 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #define HYP_NO_ORDER UINT_MAX 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun struct hyp_pool { 13*4882a593Smuzhiyun /* 14*4882a593Smuzhiyun * Spinlock protecting concurrent changes to the memory pool as well as 15*4882a593Smuzhiyun * the struct hyp_page of the pool's pages until we have a proper atomic 16*4882a593Smuzhiyun * API at EL2. 17*4882a593Smuzhiyun */ 18*4882a593Smuzhiyun hyp_spinlock_t lock; 19*4882a593Smuzhiyun struct list_head free_area[MAX_ORDER]; 20*4882a593Smuzhiyun phys_addr_t range_start; 21*4882a593Smuzhiyun phys_addr_t range_end; 22*4882a593Smuzhiyun unsigned int max_order; 23*4882a593Smuzhiyun }; 24*4882a593Smuzhiyun hyp_page_ref_inc(struct hyp_page * p)25*4882a593Smuzhiyunstatic inline void hyp_page_ref_inc(struct hyp_page *p) 26*4882a593Smuzhiyun { 27*4882a593Smuzhiyun struct hyp_pool *pool = hyp_page_to_pool(p); 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun hyp_spin_lock(&pool->lock); 30*4882a593Smuzhiyun p->refcount++; 31*4882a593Smuzhiyun hyp_spin_unlock(&pool->lock); 32*4882a593Smuzhiyun } 33*4882a593Smuzhiyun hyp_page_ref_dec_and_test(struct hyp_page * p)34*4882a593Smuzhiyunstatic inline int hyp_page_ref_dec_and_test(struct hyp_page *p) 35*4882a593Smuzhiyun { 36*4882a593Smuzhiyun struct hyp_pool *pool = hyp_page_to_pool(p); 37*4882a593Smuzhiyun int ret; 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun hyp_spin_lock(&pool->lock); 40*4882a593Smuzhiyun p->refcount--; 41*4882a593Smuzhiyun ret = (p->refcount == 0); 42*4882a593Smuzhiyun hyp_spin_unlock(&pool->lock); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun return ret; 45*4882a593Smuzhiyun } 46*4882a593Smuzhiyun hyp_set_page_refcounted(struct hyp_page * p)47*4882a593Smuzhiyunstatic inline void hyp_set_page_refcounted(struct hyp_page *p) 48*4882a593Smuzhiyun { 49*4882a593Smuzhiyun struct hyp_pool *pool = hyp_page_to_pool(p); 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun hyp_spin_lock(&pool->lock); 52*4882a593Smuzhiyun if (p->refcount) { 53*4882a593Smuzhiyun hyp_spin_unlock(&pool->lock); 54*4882a593Smuzhiyun hyp_panic(); 55*4882a593Smuzhiyun } 56*4882a593Smuzhiyun p->refcount = 1; 57*4882a593Smuzhiyun hyp_spin_unlock(&pool->lock); 58*4882a593Smuzhiyun } 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun /* Allocation */ 61*4882a593Smuzhiyun void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order); 62*4882a593Smuzhiyun void hyp_split_page(struct hyp_page *page); 63*4882a593Smuzhiyun void hyp_get_page(void *addr); 64*4882a593Smuzhiyun void hyp_put_page(void *addr); 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun /* Used pages cannot be freed */ 67*4882a593Smuzhiyun int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, 68*4882a593Smuzhiyun unsigned int reserved_pages); 69*4882a593Smuzhiyun #endif /* __KVM_HYP_GFP_H */ 70