module.h

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/*
 * Because linux/module.h has tracepoints in the header, and ftrace.h
 * used to include this file, define_trace.h includes linux/module.h
 * But we do not want the module.h to override the TRACE_SYSTEM macro
 * variable that define_trace.h is processing, so we only set it
 * when module events are being processed, which would happen when
 * CREATE_TRACE_POINTS is defined.
 */
#ifdef CREATE_TRACE_POINTS
#undef TRACE_SYSTEM
#define TRACE_SYSTEM module
#endif

#if !defined(_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_MODULE_H

#include <linux/tracepoint.h>

#ifdef CONFIG_MODULES

struct module;

#define show_module_flags(flags) __print_flags(flags, "",   \
    { (1UL << TAINT_PROPRIETARY_MODULE),    "P" },      \
    { (1UL << TAINT_FORCED_MODULE),     "F" },      \
    { (1UL << TAINT_CRAP),          "C" })

TRACE_EVENT(module_load,

    TP_PROTO(struct module *mod),

    TP_ARGS(mod),

    TP_STRUCT__entry(
        __field(    unsigned int,   taints      )
        __string(   name,       mod->name   )
    ),

    TP_fast_assign(
        __entry->taints = mod->taints;
        __assign_str(name, mod->name);
    ),

    TP_printk("%s %s", __get_str(name), show_module_flags(__entry->taints))
);

TRACE_EVENT(module_free,

    TP_PROTO(struct module *mod),

    TP_ARGS(mod),

    TP_STRUCT__entry(
        __string(   name,       mod->name   )
    ),

    TP_fast_assign(
        __assign_str(name, mod->name);
    ),

    TP_printk("%s", __get_str(name))
);

#ifdef CONFIG_MODULE_UNLOAD
/* trace_module_get/put are only used if CONFIG_MODULE_UNLOAD is defined */

DECLARE_EVENT_CLASS(module_refcnt,

    TP_PROTO(struct module *mod, unsigned long ip),

    TP_ARGS(mod, ip),

    TP_STRUCT__entry(
        __field(    unsigned long,  ip      )
        __field(    int,        refcnt      )
        __string(   name,       mod->name   )
    ),

    TP_fast_assign(
        __entry->ip = ip;
        __entry->refcnt = __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs);
        __assign_str(name, mod->name);
    ),

    TP_printk("%s call_site=%pf refcnt=%d",
          __get_str(name), (void *)__entry->ip, __entry->refcnt)
);

DEFINE_EVENT(module_refcnt, module_get,

    TP_PROTO(struct module *mod, unsigned long ip),

    TP_ARGS(mod, ip)
);

DEFINE_EVENT(module_refcnt, module_put,

    TP_PROTO(struct module *mod, unsigned long ip),

    TP_ARGS(mod, ip)
);
#endif /* CONFIG_MODULE_UNLOAD */

TRACE_EVENT(module_request,

    TP_PROTO(char *name, bool wait, unsigned long ip),

    TP_ARGS(name, wait, ip),

    TP_STRUCT__entry(
        __field(    unsigned long,  ip      )
        __field(    bool,       wait        )
        __string(   name,       name        )
    ),

    TP_fast_assign(
        __entry->ip = ip;
        __entry->wait   = wait;
        __assign_str(name, name);
    ),

    TP_printk("%s wait=%d call_site=%pf",
          __get_str(name), (int)__entry->wait, (void *)__entry->ip)
);

#endif /* CONFIG_MODULES */

#endif /* _TRACE_MODULE_H */

/* This part must be outside protection */
#include <trace/define_trace.h>