include/linux/mmiotrace.h

   1 #ifndef MMIOTRACE_H
   2 #define MMIOTRACE_H
   3
   4 #include <asm/types.h>
   5
   6 #ifdef __KERNEL__
   7
   8 #include <linux/list.h>
   9
  10 struct kmmio_probe;
  11 struct pt_regs;
  12
  13 typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
  14                                 struct pt_regs *, unsigned long addr);
  15 typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
  16                                 unsigned long condition, struct pt_regs *);
  17
  18 struct kmmio_probe {
  19         struct list_head list; /* kmmio internal list */
  20         unsigned long addr; /* start location of the probe point */
  21         unsigned long len; /* length of the probe region */
  22         kmmio_pre_handler_t pre_handler; /* Called before addr is executed. */
  23         kmmio_post_handler_t post_handler; /* Called after addr is executed */
  24         void *user_data;
  25 };
  26
  27 /* kmmio is active by some kmmio_probes? */
  28 static inline int is_kmmio_active(void)
  29 {
  30         extern unsigned int kmmio_count;
  31         return kmmio_count;
  32 }
  33
  34 extern void reference_kmmio(void);
  35 extern void unreference_kmmio(void);
  36 extern int register_kmmio_probe(struct kmmio_probe *p);
  37 extern void unregister_kmmio_probe(struct kmmio_probe *p);
  38
  39 /* Called from page fault handler. */
  40 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
  41
  42 /* Called from ioremap.c */
  43 #ifdef CONFIG_MMIOTRACE
  44 extern void
  45 mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr);
  46 extern void mmiotrace_iounmap(volatile void __iomem *addr);
  47 #else
  48 static inline void
  49 mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr)
  50 {
  51 }
  52 static inline void mmiotrace_iounmap(volatile void __iomem *addr)
  53 {
  54 }
  55 #endif /* CONFIG_MMIOTRACE_HOOKS */
  56
  57 enum mm_io_opcode {
  58         MMIO_READ = 0x1,     /* struct mmiotrace_rw */
  59         MMIO_WRITE = 0x2,    /* struct mmiotrace_rw */
  60         MMIO_PROBE = 0x3,    /* struct mmiotrace_map */
  61         MMIO_UNPROBE = 0x4,  /* struct mmiotrace_map */
  62         MMIO_MARKER = 0x5,   /* raw char data */
  63         MMIO_UNKNOWN_OP = 0x6, /* struct mmiotrace_rw */
  64 };
  65
  66 struct mmiotrace_rw {
  67         unsigned long phys;     /* PCI address of register */
  68         unsigned long value;
  69         unsigned long pc;       /* optional program counter */
  70         int map_id;
  71         unsigned char opcode;   /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
  72         unsigned char width;    /* size of register access in bytes */
  73 };
  74
  75 struct mmiotrace_map {
  76         unsigned long phys;     /* base address in PCI space */
  77         unsigned long virt;     /* base virtual address */
  78         unsigned long len;      /* mapping size */
  79         int map_id;
  80         unsigned char opcode;   /* MMIO_PROBE or MMIO_UNPROBE */
  81 };
  82
  83 /* in kernel/trace/trace_mmiotrace.c */
  84 extern void enable_mmiotrace(void);
  85 extern void disable_mmiotrace(void);
  86 extern void mmio_trace_rw(struct mmiotrace_rw *rw);
  87 extern void mmio_trace_mapping(struct mmiotrace_map *map);
  88
  89 #endif /* __KERNEL__ */
  90
  91 #endif /* MMIOTRACE_H */