Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mmiotrace.h
Go to the documentation of this file.
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);
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: */
24  /* Called after addr is executed: */
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? */
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: */
54 static inline int is_kmmio_active(void)
55 {
56  return 0;
57 }
58 
59 static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
60 {
61  return 0;
62 }
63 
64 static inline void mmiotrace_ioremap(resource_size_t offset,
65  unsigned long size, void __iomem *addr)
66 {
67 }
68 
69 static inline void mmiotrace_iounmap(volatile void __iomem *addr)
70 {
71 }
72 
73 static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
74 {
75  return 0;
76 }
77 #endif /* CONFIG_MMIOTRACE */
78 
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 */