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