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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_MMIOTRACE_H
3#define _LINUX_MMIOTRACE_H
4
5#include <linux/types.h>
6#include <linux/list.h>
7
8struct kmmio_probe;
9struct pt_regs;
10
11typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
12 struct pt_regs *, unsigned long addr);
13typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
14 unsigned long condition, struct pt_regs *);
15
16struct kmmio_probe {
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;
28};
29
30extern unsigned int kmmio_count;
31
32extern int register_kmmio_probe(struct kmmio_probe *p);
33extern void unregister_kmmio_probe(struct kmmio_probe *p);
34extern int kmmio_init(void);
35extern void kmmio_cleanup(void);
36
37#ifdef CONFIG_MMIOTRACE
38/* kmmio is active by some kmmio_probes? */
39static inline int is_kmmio_active(void)
40{
41 return kmmio_count;
42}
43
44/* Called from page fault handler. */
45extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
46
47/* Called from ioremap.c */
48extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
49 void __iomem *addr);
50extern void mmiotrace_iounmap(volatile void __iomem *addr);
51
52/* For anyone to insert markers. Remember trailing newline. */
53extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...);
54#else /* !CONFIG_MMIOTRACE: */
55static inline int is_kmmio_active(void)
56{
57 return 0;
58}
59
60static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
61{
62 return 0;
63}
64
65static inline void mmiotrace_ioremap(resource_size_t offset,
66 unsigned long size, void __iomem *addr)
67{
68}
69
70static inline void mmiotrace_iounmap(volatile void __iomem *addr)
71{
72}
73
74static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
75{
76 return 0;
77}
78#endif /* CONFIG_MMIOTRACE */
79
80enum mm_io_opcode {
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 */
86};
87
88struct mmiotrace_rw {
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 */
95};
96
97struct mmiotrace_map {
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 */
103};
104
105/* in kernel/trace/trace_mmiotrace.c */
106extern void enable_mmiotrace(void);
107extern void disable_mmiotrace(void);
108extern void mmio_trace_rw(struct mmiotrace_rw *rw);
109extern void mmio_trace_mapping(struct mmiotrace_map *map);
110extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args);
111
112#endif /* _LINUX_MMIOTRACE_H */