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 #ifdef CONFIG_MMIOTRACE
  38 /* Called from ioremap.c */
  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
  43 /* For anyone to insert markers. Remember trailing newline. */
  44 extern int mmiotrace_printk(const char *fmt, ...)
  45                                 __attribute__ ((format (printf, 1, 2)));
  46 #else
  47 static inline void mmiotrace_ioremap(resource_size_t offset,
  48                                         unsigned long size, void __iomem *addr)
  49 {
  50 }
  51
  52 static inline void mmiotrace_iounmap(volatile void __iomem *addr)
  53 {
  54 }
  55
  56 static inline int mmiotrace_printk(const char *fmt, ...)
  57                                 __attribute__ ((format (printf, 1, 0)));
  58
  59 static inline int mmiotrace_printk(const char *fmt, ...)
  60 {
  61         return 0;
  62 }
  63 #endif /* CONFIG_MMIOTRACE */
  64
  65 enum mm_io_opcode {
  66         MMIO_READ = 0x1,     /* struct mmiotrace_rw */
  67         MMIO_WRITE = 0x2,    /* struct mmiotrace_rw */
  68         MMIO_PROBE = 0x3,    /* struct mmiotrace_map */
  69         MMIO_UNPROBE = 0x4,  /* struct mmiotrace_map */
  70         MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */
  71 };
  72
  73 struct mmiotrace_rw {
  74         resource_size_t phys;   /* PCI address of register */
  75         unsigned long value;
  76         unsigned long pc;       /* optional program counter */
  77         int map_id;
  78         unsigned char opcode;   /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
  79         unsigned char width;    /* size of register access in bytes */
  80 };
  81
  82 struct mmiotrace_map {
  83         resource_size_t phys;   /* base address in PCI space */
  84         unsigned long virt;     /* base virtual address */
  85         unsigned long len;      /* mapping size */
  86         int map_id;
  87         unsigned char opcode;   /* MMIO_PROBE or MMIO_UNPROBE */
  88 };
  89
  90 /* in kernel/trace/trace_mmiotrace.c */
  91 extern void enable_mmiotrace(void);
  92 extern void disable_mmiotrace(void);
  93 extern void mmio_trace_rw(struct mmiotrace_rw *rw);
  94 extern void mmio_trace_mapping(struct mmiotrace_map *map);
  95 extern int mmio_trace_printk(const char *fmt, va_list args);
  96
  97 #endif /* MMIOTRACE_H */