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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 */
18typedef struct xmaddr {
19 phys_addr_t maddr;
20} xmaddr_t;
21
22/* Xen pseudo-physical address */
23typedef 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
43unsigned long __pfn_to_mfn(unsigned long pfn);
44extern struct rb_root phys_to_mach;
45
46/* Pseudo-physical <-> Guest conversion */
47static inline unsigned long pfn_to_gfn(unsigned long pfn)
48{
49 return pfn;
50}
51
52static inline unsigned long gfn_to_pfn(unsigned long gfn)
53{
54 return gfn;
55}
56
57/* Pseudo-physical <-> BUS conversion */
58static 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
71static 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. */
90static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
91{
92 BUG();
93}
94
95extern 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
99extern 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
103bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
104bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
105 unsigned long nr_pages);
106
107static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
108{
109 return __set_phys_to_machine(pfn, mfn);
110}
111
112bool 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 */
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#include <asm/pgtable.h>
7
8#include <linux/pfn.h>
9#include <linux/types.h>
10#include <linux/dma-mapping.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 */
18typedef struct xmaddr {
19 phys_addr_t maddr;
20} xmaddr_t;
21
22/* Xen pseudo-physical address */
23typedef 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
43unsigned long __pfn_to_mfn(unsigned long pfn);
44extern struct rb_root phys_to_mach;
45
46/* Pseudo-physical <-> Guest conversion */
47static inline unsigned long pfn_to_gfn(unsigned long pfn)
48{
49 return pfn;
50}
51
52static inline unsigned long gfn_to_pfn(unsigned long gfn)
53{
54 return gfn;
55}
56
57/* Pseudo-physical <-> BUS conversion */
58static 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
71static 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) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
80#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
81
82/* Only used in PV code. But ARM guests are always HVM. */
83static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
84{
85 BUG();
86}
87
88extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
89 struct gnttab_map_grant_ref *kmap_ops,
90 struct page **pages, unsigned int count);
91
92extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
93 struct gnttab_unmap_grant_ref *kunmap_ops,
94 struct page **pages, unsigned int count);
95
96bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
97bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
98 unsigned long nr_pages);
99
100static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
101{
102 return __set_phys_to_machine(pfn, mfn);
103}
104
105#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
106#define xen_unmap(cookie) iounmap((cookie))
107
108bool xen_arch_need_swiotlb(struct device *dev,
109 phys_addr_t phys,
110 dma_addr_t dev_addr);
111unsigned long xen_get_swiotlb_free_pages(unsigned int order);
112
113#endif /* _ASM_ARM_XEN_PAGE_H */