mmiotrace.h

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#ifndef _LINUX_MMIOTRACE_H
#define _LINUX_MMIOTRACE_H

#include <linux/types.h>
#include <linux/list.h>

struct kmmio_probe;
struct pt_regs;

typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
                struct pt_regs *, unsigned long addr);
typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
                unsigned long condition, struct pt_regs *);

struct kmmio_probe {
    /* kmmio internal list: */
    struct list_head    list;
    /* start location of the probe point: */
    unsigned long       addr;
    /* length of the probe region: */
    unsigned long       len;
    /* Called before addr is executed: */
    kmmio_pre_handler_t pre_handler;
    /* Called after addr is executed: */
    kmmio_post_handler_t    post_handler;
    void            *private;
};

extern unsigned int kmmio_count;

extern int register_kmmio_probe(struct kmmio_probe *p);
extern void unregister_kmmio_probe(struct kmmio_probe *p);
extern int kmmio_init(void);
extern void kmmio_cleanup(void);

#ifdef CONFIG_MMIOTRACE
/* kmmio is active by some kmmio_probes? */
static inline int is_kmmio_active(void)
{
    return kmmio_count;
}

/* Called from page fault handler. */
extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);

/* Called from ioremap.c */
extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
                            void __iomem *addr);
extern void mmiotrace_iounmap(volatile void __iomem *addr);

/* For anyone to insert markers. Remember trailing newline. */
extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...);
#else /* !CONFIG_MMIOTRACE: */
static inline int is_kmmio_active(void)
{
    return 0;
}

static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
{
    return 0;
}

static inline void mmiotrace_ioremap(resource_size_t offset,
                    unsigned long size, void __iomem *addr)
{
}

static inline void mmiotrace_iounmap(volatile void __iomem *addr)
{
}

static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
{
    return 0;
}
#endif /* CONFIG_MMIOTRACE */

enum mm_io_opcode {
    MMIO_READ   = 0x1,  /* struct mmiotrace_rw */
    MMIO_WRITE  = 0x2,  /* struct mmiotrace_rw */
    MMIO_PROBE  = 0x3,  /* struct mmiotrace_map */
    MMIO_UNPROBE    = 0x4,  /* struct mmiotrace_map */
    MMIO_UNKNOWN_OP = 0x5,  /* struct mmiotrace_rw */
};

struct mmiotrace_rw {
    resource_size_t phys;   /* PCI address of register */
    unsigned long   value;
    unsigned long   pc; /* optional program counter */
    int     map_id;
    unsigned char   opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
    unsigned char   width;  /* size of register access in bytes */
};

struct mmiotrace_map {
    resource_size_t phys;   /* base address in PCI space */
    unsigned long   virt;   /* base virtual address */
    unsigned long   len;    /* mapping size */
    int     map_id;
    unsigned char   opcode; /* MMIO_PROBE or MMIO_UNPROBE */
};

/* in kernel/trace/trace_mmiotrace.c */
extern void enable_mmiotrace(void);
extern void disable_mmiotrace(void);
extern void mmio_trace_rw(struct mmiotrace_rw *rw);
extern void mmio_trace_mapping(struct mmiotrace_map *map);
extern int mmio_trace_printk(const char *fmt, va_list args);

#endif /* _LINUX_MMIOTRACE_H */