1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_KEXEC_HANDOVER_H
#define LINUX_KEXEC_HANDOVER_H
#include <linux/types.h>
#include <linux/errno.h>
struct kho_scratch {
phys_addr_t addr;
phys_addr_t size;
};
/* KHO Notifier index */
enum kho_event {
KEXEC_KHO_FINALIZE = 0,
KEXEC_KHO_ABORT = 1,
};
struct folio;
struct notifier_block;
#define DECLARE_KHOSER_PTR(name, type) \
union { \
phys_addr_t phys; \
type ptr; \
} name
#define KHOSER_STORE_PTR(dest, val) \
({ \
typeof(val) v = val; \
typecheck(typeof((dest).ptr), v); \
(dest).phys = virt_to_phys(v); \
})
#define KHOSER_LOAD_PTR(src) \
({ \
typeof(src) s = src; \
(typeof((s).ptr))((s).phys ? phys_to_virt((s).phys) : NULL); \
})
struct kho_serialization;
#ifdef CONFIG_KEXEC_HANDOVER
bool kho_is_enabled(void);
int kho_preserve_folio(struct folio *folio);
int kho_preserve_phys(phys_addr_t phys, size_t size);
struct folio *kho_restore_folio(phys_addr_t phys);
int kho_add_subtree(struct kho_serialization *ser, const char *name, void *fdt);
int kho_retrieve_subtree(const char *name, phys_addr_t *phys);
int register_kho_notifier(struct notifier_block *nb);
int unregister_kho_notifier(struct notifier_block *nb);
void kho_memory_init(void);
void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys,
u64 scratch_len);
#else
static inline bool kho_is_enabled(void)
{
return false;
}
static inline int kho_preserve_folio(struct folio *folio)
{
return -EOPNOTSUPP;
}
static inline int kho_preserve_phys(phys_addr_t phys, size_t size)
{
return -EOPNOTSUPP;
}
static inline struct folio *kho_restore_folio(phys_addr_t phys)
{
return NULL;
}
static inline int kho_add_subtree(struct kho_serialization *ser,
const char *name, void *fdt)
{
return -EOPNOTSUPP;
}
static inline int kho_retrieve_subtree(const char *name, phys_addr_t *phys)
{
return -EOPNOTSUPP;
}
static inline int register_kho_notifier(struct notifier_block *nb)
{
return -EOPNOTSUPP;
}
static inline int unregister_kho_notifier(struct notifier_block *nb)
{
return -EOPNOTSUPP;
}
static inline void kho_memory_init(void)
{
}
static inline void kho_populate(phys_addr_t fdt_phys, u64 fdt_len,
phys_addr_t scratch_phys, u64 scratch_len)
{
}
#endif /* CONFIG_KEXEC_HANDOVER */
#endif /* LINUX_KEXEC_HANDOVER_H */
|
