include/linux/mmiotrace.h

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