/* 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 UINT_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[MAX_ORDER]; phys_addr_t range_start; phys_addr_t range_end; unsigned int max_order; }; static inline void hyp_page_ref_inc(struct hyp_page *p) { struct hyp_pool *pool = hyp_page_to_pool(p); hyp_spin_lock(&pool->lock); p->refcount++; hyp_spin_unlock(&pool->lock); } static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) { struct hyp_pool *pool = hyp_page_to_pool(p); int ret; hyp_spin_lock(&pool->lock); p->refcount--; ret = (p->refcount == 0); hyp_spin_unlock(&pool->lock); return ret; } static inline void hyp_set_page_refcounted(struct hyp_page *p) { struct hyp_pool *pool = hyp_page_to_pool(p); hyp_spin_lock(&pool->lock); if (p->refcount) { hyp_spin_unlock(&pool->lock); BUG(); } p->refcount = 1; hyp_spin_unlock(&pool->lock); } /* Allocation */ void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order); void hyp_get_page(void *addr); void hyp_put_page(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 */