linux/include/linux/mmiotrace.h
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   1#ifndef _LINUX_MMIOTRACE_H
   2#define _LINUX_MMIOTRACE_H
   3
   4#include <linux/types.h>
   5#include <linux/list.h>
   6
   7struct kmmio_probe;
   8struct pt_regs;
   9
  10typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
  11                                struct pt_regs *, unsigned long addr);
  12typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
  13                                unsigned long condition, struct pt_regs *);
  14
  15struct 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
  29extern unsigned int kmmio_count;
  30
  31extern int register_kmmio_probe(struct kmmio_probe *p);
  32extern void unregister_kmmio_probe(struct kmmio_probe *p);
  33extern int kmmio_init(void);
  34extern void kmmio_cleanup(void);
  35
  36#ifdef CONFIG_MMIOTRACE
  37/* kmmio is active by some kmmio_probes? */
  38static inline int is_kmmio_active(void)
  39{
  40        return kmmio_count;
  41}
  42
  43/* Called from page fault handler. */
  44extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
  45
  46/* Called from ioremap.c */
  47extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
  48                                                        void __iomem *addr);
  49extern void mmiotrace_iounmap(volatile void __iomem *addr);
  50
  51/* For anyone to insert markers. Remember trailing newline. */
  52extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...);
  53#else /* !CONFIG_MMIOTRACE: */
  54static inline int is_kmmio_active(void)
  55{
  56        return 0;
  57}
  58
  59static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
  60{
  61        return 0;
  62}
  63
  64static inline void mmiotrace_ioremap(resource_size_t offset,
  65                                        unsigned long size, void __iomem *addr)
  66{
  67}
  68
  69static inline void mmiotrace_iounmap(volatile void __iomem *addr)
  70{
  71}
  72
  73static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
  74{
  75        return 0;
  76}
  77#endif /* CONFIG_MMIOTRACE */
  78
  79enum 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
  87struct 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
  96struct 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 */
 105extern void enable_mmiotrace(void);
 106extern void disable_mmiotrace(void);
 107extern void mmio_trace_rw(struct mmiotrace_rw *rw);
 108extern void mmio_trace_mapping(struct mmiotrace_map *map);
 109extern int mmio_trace_printk(const char *fmt, va_list args);
 110
 111#endif /* _LINUX_MMIOTRACE_H */
 112
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