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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
b814d41f IM |
2 | #ifndef _LINUX_MMIOTRACE_H |
3 | #define _LINUX_MMIOTRACE_H | |
8b7d89d0 | 4 | |
970e6fa0 | 5 | #include <linux/types.h> |
0fd0e3da PP |
6 | #include <linux/list.h> |
7 | ||
8 | struct kmmio_probe; | |
9 | struct pt_regs; | |
10 | ||
11 | typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *, | |
12 | struct pt_regs *, unsigned long addr); | |
13 | typedef void (*kmmio_post_handler_t)(struct kmmio_probe *, | |
14 | unsigned long condition, struct pt_regs *); | |
15 | ||
16 | struct kmmio_probe { | |
b814d41f IM |
17 | /* kmmio internal list: */ |
18 | struct list_head list; | |
19 | /* start location of the probe point: */ | |
20 | unsigned long addr; | |
21 | /* length of the probe region: */ | |
22 | unsigned long len; | |
23 | /* Called before addr is executed: */ | |
24 | kmmio_pre_handler_t pre_handler; | |
25 | /* Called after addr is executed: */ | |
26 | kmmio_post_handler_t post_handler; | |
27 | void *private; | |
0fd0e3da PP |
28 | }; |
29 | ||
b814d41f IM |
30 | extern unsigned int kmmio_count; |
31 | ||
32 | extern int register_kmmio_probe(struct kmmio_probe *p); | |
33 | extern void unregister_kmmio_probe(struct kmmio_probe *p); | |
0f9a623d SB |
34 | extern int kmmio_init(void); |
35 | extern void kmmio_cleanup(void); | |
b814d41f IM |
36 | |
37 | #ifdef CONFIG_MMIOTRACE | |
0fd0e3da PP |
38 | /* kmmio is active by some kmmio_probes? */ |
39 | static inline int is_kmmio_active(void) | |
40 | { | |
0fd0e3da PP |
41 | return kmmio_count; |
42 | } | |
43 | ||
0fd0e3da PP |
44 | /* Called from page fault handler. */ |
45 | extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); | |
46 | ||
9e57fb35 | 47 | /* Called from ioremap.c */ |
dee310d0 PP |
48 | extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, |
49 | void __iomem *addr); | |
d61fc448 | 50 | extern void mmiotrace_iounmap(volatile void __iomem *addr); |
9e57fb35 PP |
51 | |
52 | /* For anyone to insert markers. Remember trailing newline. */ | |
b9075fa9 | 53 | extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...); |
b814d41f IM |
54 | #else /* !CONFIG_MMIOTRACE: */ |
55 | static inline int is_kmmio_active(void) | |
56 | { | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr) | |
61 | { | |
62 | return 0; | |
63 | } | |
64 | ||
dee310d0 PP |
65 | static inline void mmiotrace_ioremap(resource_size_t offset, |
66 | unsigned long size, void __iomem *addr) | |
d61fc448 PP |
67 | { |
68 | } | |
dee310d0 | 69 | |
d61fc448 PP |
70 | static inline void mmiotrace_iounmap(volatile void __iomem *addr) |
71 | { | |
72 | } | |
9e57fb35 | 73 | |
b9075fa9 | 74 | static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...) |
9e57fb35 PP |
75 | { |
76 | return 0; | |
77 | } | |
78 | #endif /* CONFIG_MMIOTRACE */ | |
d61fc448 | 79 | |
bd8ac686 | 80 | enum mm_io_opcode { |
b814d41f IM |
81 | MMIO_READ = 0x1, /* struct mmiotrace_rw */ |
82 | MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ | |
83 | MMIO_PROBE = 0x3, /* struct mmiotrace_map */ | |
84 | MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ | |
85 | MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */ | |
8b7d89d0 PP |
86 | }; |
87 | ||
bd8ac686 | 88 | struct mmiotrace_rw { |
b814d41f IM |
89 | resource_size_t phys; /* PCI address of register */ |
90 | unsigned long value; | |
91 | unsigned long pc; /* optional program counter */ | |
92 | int map_id; | |
93 | unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ | |
94 | unsigned char width; /* size of register access in bytes */ | |
8b7d89d0 PP |
95 | }; |
96 | ||
bd8ac686 | 97 | struct mmiotrace_map { |
b814d41f IM |
98 | resource_size_t phys; /* base address in PCI space */ |
99 | unsigned long virt; /* base virtual address */ | |
100 | unsigned long len; /* mapping size */ | |
101 | int map_id; | |
102 | unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ | |
8b7d89d0 PP |
103 | }; |
104 | ||
bd8ac686 PP |
105 | /* in kernel/trace/trace_mmiotrace.c */ |
106 | extern void enable_mmiotrace(void); | |
107 | extern void disable_mmiotrace(void); | |
108 | extern void mmio_trace_rw(struct mmiotrace_rw *rw); | |
109 | extern void mmio_trace_mapping(struct mmiotrace_map *map); | |
8db14860 | 110 | extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args); |
8b7d89d0 | 111 | |
b814d41f | 112 | #endif /* _LINUX_MMIOTRACE_H */ |