include/linux/mmiotrace.h

   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? */
  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
  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 */