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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#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 */
1#ifndef _ASM_ARM_XEN_PAGE_H
2#define _ASM_ARM_XEN_PAGE_H
3
4#include <asm/page.h>
5#include <asm/pgtable.h>
6
7#include <linux/pfn.h>
8#include <linux/types.h>
9#include <linux/dma-mapping.h>
10
11#include <xen/xen.h>
12#include <xen/interface/grant_table.h>
13
14#define phys_to_machine_mapping_valid(pfn) (1)
15
16/* Xen machine address */
17typedef struct xmaddr {
18 phys_addr_t maddr;
19} xmaddr_t;
20
21/* Xen pseudo-physical address */
22typedef struct xpaddr {
23 phys_addr_t paddr;
24} xpaddr_t;
25
26#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
27#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
28
29#define INVALID_P2M_ENTRY (~0UL)
30
31/*
32 * The pseudo-physical frame (pfn) used in all the helpers is always based
33 * on Xen page granularity (i.e 4KB).
34 *
35 * A Linux page may be split across multiple non-contiguous Xen page so we
36 * have to keep track with frame based on 4KB page granularity.
37 *
38 * PV drivers should never make a direct usage of those helpers (particularly
39 * pfn_to_gfn and gfn_to_pfn).
40 */
41
42unsigned long __pfn_to_mfn(unsigned long pfn);
43extern struct rb_root phys_to_mach;
44
45/* Pseudo-physical <-> Guest conversion */
46static inline unsigned long pfn_to_gfn(unsigned long pfn)
47{
48 return pfn;
49}
50
51static inline unsigned long gfn_to_pfn(unsigned long gfn)
52{
53 return gfn;
54}
55
56/* Pseudo-physical <-> BUS conversion */
57static inline unsigned long pfn_to_bfn(unsigned long pfn)
58{
59 unsigned long mfn;
60
61 if (phys_to_mach.rb_node != NULL) {
62 mfn = __pfn_to_mfn(pfn);
63 if (mfn != INVALID_P2M_ENTRY)
64 return mfn;
65 }
66
67 return pfn;
68}
69
70static inline unsigned long bfn_to_pfn(unsigned long bfn)
71{
72 return bfn;
73}
74
75#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
76
77/* VIRT <-> GUEST conversion */
78#define virt_to_gfn(v) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
79#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
80
81/* Only used in PV code. But ARM guests are always HVM. */
82static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
83{
84 BUG();
85}
86
87/* TODO: this shouldn't be here but it is because the frontend drivers
88 * are using it (its rolled in headers) even though we won't hit the code path.
89 * So for right now just punt with this.
90 */
91static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
92{
93 BUG();
94 return NULL;
95}
96
97extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
98 struct gnttab_map_grant_ref *kmap_ops,
99 struct page **pages, unsigned int count);
100
101extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
102 struct gnttab_unmap_grant_ref *kunmap_ops,
103 struct page **pages, unsigned int count);
104
105bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
106bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
107 unsigned long nr_pages);
108
109static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
110{
111 return __set_phys_to_machine(pfn, mfn);
112}
113
114#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
115#define xen_unmap(cookie) iounmap((cookie))
116
117bool xen_arch_need_swiotlb(struct device *dev,
118 phys_addr_t phys,
119 dma_addr_t dev_addr);
120unsigned long xen_get_swiotlb_free_pages(unsigned int order);
121
122#endif /* _ASM_ARM_XEN_PAGE_H */