/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __KVM_HYP_GFP_H
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#define __KVM_HYP_GFP_H
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#include <linux/list.h>
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#include <nvhe/memory.h>
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#include <nvhe/spinlock.h>
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#define HYP_NO_ORDER UINT_MAX
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struct hyp_pool {
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/*
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* Spinlock protecting concurrent changes to the memory pool as well as
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* the struct hyp_page of the pool's pages until we have a proper atomic
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* API at EL2.
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*/
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hyp_spinlock_t lock;
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struct list_head free_area[MAX_ORDER];
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phys_addr_t range_start;
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phys_addr_t range_end;
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unsigned int max_order;
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};
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static inline void hyp_page_ref_inc(struct hyp_page *p)
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{
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struct hyp_pool *pool = hyp_page_to_pool(p);
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hyp_spin_lock(&pool->lock);
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p->refcount++;
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hyp_spin_unlock(&pool->lock);
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}
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static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
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{
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struct hyp_pool *pool = hyp_page_to_pool(p);
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int ret;
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hyp_spin_lock(&pool->lock);
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p->refcount--;
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ret = (p->refcount == 0);
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hyp_spin_unlock(&pool->lock);
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return ret;
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}
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static inline void hyp_set_page_refcounted(struct hyp_page *p)
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{
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struct hyp_pool *pool = hyp_page_to_pool(p);
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hyp_spin_lock(&pool->lock);
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if (p->refcount) {
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hyp_spin_unlock(&pool->lock);
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hyp_panic();
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}
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p->refcount = 1;
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hyp_spin_unlock(&pool->lock);
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}
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/* Allocation */
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void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order);
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void hyp_split_page(struct hyp_page *page);
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void hyp_get_page(void *addr);
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void hyp_put_page(void *addr);
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/* Used pages cannot be freed */
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int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
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unsigned int reserved_pages);
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#endif /* __KVM_HYP_GFP_H */
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