root/include/linux/mmiotrace.h

DEFINITIONS

1. is_kmmio_active
2. __printf
3. kmmio_handler
4. mmiotrace_ioremap
5. mmiotrace_iounmap
6. __printf

#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 */