xref: /linux/arch/arm64/kvm/hyp/include/nvhe/memory.h (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18) 
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __KVM_HYP_MEMORY_H
3 #define __KVM_HYP_MEMORY_H
4 
5 #include <asm/kvm_mmu.h>
6 #include <asm/page.h>
7 
8 #include <linux/types.h>
9 
10 struct hyp_page {
11 	unsigned short refcount;
12 	unsigned short order;
13 };
14 
15 extern u64 __hyp_vmemmap;
16 #define hyp_vmemmap ((struct hyp_page *)__hyp_vmemmap)
17 
18 #define __hyp_va(phys)	((void *)((phys_addr_t)(phys) - hyp_physvirt_offset))
19 
hyp_phys_to_virt(phys_addr_t phys)20 static inline void *hyp_phys_to_virt(phys_addr_t phys)
21 {
22 	return __hyp_va(phys);
23 }
24 
hyp_virt_to_phys(void * addr)25 static inline phys_addr_t hyp_virt_to_phys(void *addr)
26 {
27 	return __hyp_pa(addr);
28 }
29 
30 #define hyp_phys_to_pfn(phys)	((phys) >> PAGE_SHIFT)
31 #define hyp_pfn_to_phys(pfn)	((phys_addr_t)((pfn) << PAGE_SHIFT))
32 #define hyp_phys_to_page(phys)	(&hyp_vmemmap[hyp_phys_to_pfn(phys)])
33 #define hyp_virt_to_page(virt)	hyp_phys_to_page(__hyp_pa(virt))
34 #define hyp_virt_to_pfn(virt)	hyp_phys_to_pfn(__hyp_pa(virt))
35 
36 #define hyp_page_to_pfn(page)	((struct hyp_page *)(page) - hyp_vmemmap)
37 #define hyp_page_to_phys(page)  hyp_pfn_to_phys((hyp_page_to_pfn(page)))
38 #define hyp_page_to_virt(page)	__hyp_va(hyp_page_to_phys(page))
39 #define hyp_page_to_pool(page)	(((struct hyp_page *)page)->pool)
40 
41 /*
42  * Refcounting for 'struct hyp_page'.
43  * hyp_pool::lock must be held if atomic access to the refcount is required.
44  */
hyp_page_count(void * addr)45 static inline int hyp_page_count(void *addr)
46 {
47 	struct hyp_page *p = hyp_virt_to_page(addr);
48 
49 	return p->refcount;
50 }
51 
hyp_page_ref_inc(struct hyp_page * p)52 static inline void hyp_page_ref_inc(struct hyp_page *p)
53 {
54 	BUG_ON(p->refcount == USHRT_MAX);
55 	p->refcount++;
56 }
57 
hyp_page_ref_dec(struct hyp_page * p)58 static inline void hyp_page_ref_dec(struct hyp_page *p)
59 {
60 	BUG_ON(!p->refcount);
61 	p->refcount--;
62 }
63 
hyp_page_ref_dec_and_test(struct hyp_page * p)64 static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
65 {
66 	hyp_page_ref_dec(p);
67 	return (p->refcount == 0);
68 }
69 
hyp_set_page_refcounted(struct hyp_page * p)70 static inline void hyp_set_page_refcounted(struct hyp_page *p)
71 {
72 	BUG_ON(p->refcount);
73 	p->refcount = 1;
74 }
75 #endif /* __KVM_HYP_MEMORY_H */
76