1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_ARM_XEN_PAGE_H
3 #define _ASM_ARM_XEN_PAGE_H
4
5 #include <asm/page.h>
6
7 #include <linux/pfn.h>
8 #include <linux/types.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/pgtable.h>
11
12 #include <xen/xen.h>
13 #include <xen/interface/grant_table.h>
14
15 #define phys_to_machine_mapping_valid(pfn) (1)
16
17 /* Xen machine address */
18 typedef struct xmaddr {
19 phys_addr_t maddr;
20 } xmaddr_t;
21
22 /* Xen pseudo-physical address */
23 typedef struct xpaddr {
24 phys_addr_t paddr;
25 } xpaddr_t;
26
27 #define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
28 #define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
29
30 #define INVALID_P2M_ENTRY (~0UL)
31
32 /*
33 * The pseudo-physical frame (pfn) used in all the helpers is always based
34 * on Xen page granularity (i.e 4KB).
35 *
36 * A Linux page may be split across multiple non-contiguous Xen page so we
37 * have to keep track with frame based on 4KB page granularity.
38 *
39 * PV drivers should never make a direct usage of those helpers (particularly
40 * pfn_to_gfn and gfn_to_pfn).
41 */
42
43 unsigned long __pfn_to_mfn(unsigned long pfn);
44 extern struct rb_root phys_to_mach;
45
46 /* Pseudo-physical <-> Guest conversion */
47 static inline unsigned long pfn_to_gfn(unsigned long pfn)
48 {
49 return pfn;
50 }
51
52 static inline unsigned long gfn_to_pfn(unsigned long gfn)
53 {
54 return gfn;
55 }
56
57 /* Pseudo-physical <-> BUS conversion */
58 static inline unsigned long pfn_to_bfn(unsigned long pfn)
59 {
60 unsigned long mfn;
61
62 if (phys_to_mach.rb_node != NULL) {
63 mfn = __pfn_to_mfn(pfn);
64 if (mfn != INVALID_P2M_ENTRY)
65 return mfn;
66 }
67
68 return pfn;
69 }
70
71 static inline unsigned long bfn_to_pfn(unsigned long bfn)
72 {
73 return bfn;
74 }
75
76 #define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
77
78 /* VIRT <-> GUEST conversion */
79 #define virt_to_gfn(v) \
80 ({ \
81 WARN_ON_ONCE(!virt_addr_valid(v)); \
82 pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT); \
83 })
84 #define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
85
86 #define percpu_to_gfn(v) \
87 (pfn_to_gfn(per_cpu_ptr_to_phys(v) >> XEN_PAGE_SHIFT))
88
89 /* Only used in PV code. But ARM guests are always HVM. */
90 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
91 {
92 BUG();
93 }
94
95 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
96 struct gnttab_map_grant_ref *kmap_ops,
97 struct page **pages, unsigned int count);
98
99 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
100 struct gnttab_unmap_grant_ref *kunmap_ops,
101 struct page **pages, unsigned int count);
102
103 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
104 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
105 unsigned long nr_pages);
106
107 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
108 {
109 return __set_phys_to_machine(pfn, mfn);
110 }
111
112 bool xen_arch_need_swiotlb(struct device *dev,
113 phys_addr_t phys,
114 dma_addr_t dev_addr);
115
116 #endif /* _ASM_ARM_XEN_PAGE_H */
117
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