instrumentation/events/lttng-module/module.h

   1 /*
   2  * Because linux/module.h has tracepoints in the header, and ftrace.h
   3  * eventually includes this file, define_trace.h includes linux/module.h
   4  * But we do not want the module.h to override the TRACE_SYSTEM macro
   5  * variable that define_trace.h is processing, so we only set it
   6  * when module events are being processed, which would happen when
   7  * CREATE_TRACE_POINTS is defined.
   8  */
   9 #ifdef CREATE_TRACE_POINTS
  10 #undef TRACE_SYSTEM
  11 #define TRACE_SYSTEM module
  12 #endif
  13
  14 #if !defined(_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ)
  15 #define _TRACE_MODULE_H
  16
  17 #include <linux/tracepoint.h>
  18 #include <linux/version.h>
  19
  20 #ifdef CONFIG_MODULES
  21
  22 #ifndef _TRACE_MODULE_DEF
  23 #define _TRACE_MODULE_DEF
  24 struct module;
  25
  26 #define show_module_flags(flags) __print_flags(flags, "",       \
  27         { (1UL << TAINT_PROPRIETARY_MODULE),    "P" },          \
  28         { (1UL << TAINT_FORCED_MODULE),         "F" },          \
  29         { (1UL << TAINT_CRAP),                  "C" })
  30 #endif
  31
  32 TRACE_EVENT(module_load,
  33
  34         TP_PROTO(struct module *mod),
  35
  36         TP_ARGS(mod),
  37
  38         TP_STRUCT__entry(
  39                 __field(        unsigned int,   taints          )
  40                 __string(       name,           mod->name       )
  41         ),
  42
  43         TP_fast_assign(
  44                 tp_assign(taints, mod->taints)
  45                 tp_strcpy(name, mod->name)
  46         ),
  47
  48         TP_printk("%s %s", __get_str(name), show_module_flags(__entry->taints))
  49 )
  50
  51 TRACE_EVENT(module_free,
  52
  53         TP_PROTO(struct module *mod),
  54
  55         TP_ARGS(mod),
  56
  57         TP_STRUCT__entry(
  58                 __string(       name,           mod->name       )
  59         ),
  60
  61         TP_fast_assign(
  62                 tp_strcpy(name, mod->name)
  63         ),
  64
  65         TP_printk("%s", __get_str(name))
  66 )
  67
  68 #ifdef CONFIG_MODULE_UNLOAD
  69 /* trace_module_get/put are only used if CONFIG_MODULE_UNLOAD is defined */
  70
  71 DECLARE_EVENT_CLASS(module_refcnt,
  72
  73 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  74         TP_PROTO(struct module *mod, unsigned long ip),
  75
  76         TP_ARGS(mod, ip),
  77 #else
  78         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
  79
  80         TP_ARGS(mod, ip, refcnt),
  81 #endif
  82
  83         TP_STRUCT__entry(
  84                 __field(        unsigned long,  ip              )
  85                 __field(        int,            refcnt          )
  86                 __string(       name,           mod->name       )
  87         ),
  88
  89         TP_fast_assign(
  90                 tp_assign(ip, ip)
  91 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  92                 tp_assign(refcnt, __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs))
  93 #else
  94                 tp_assign(refcnt, refcnt)
  95 #endif
  96                 tp_strcpy(name, mod->name)
  97         ),
  98
  99         TP_printk("%s call_site=%pf refcnt=%d",
 100                   __get_str(name), (void *)__entry->ip, __entry->refcnt)
 101 )
 102
 103 DEFINE_EVENT(module_refcnt, module_get,
 104
 105 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 106         TP_PROTO(struct module *mod, unsigned long ip),
 107
 108         TP_ARGS(mod, ip)
 109 #else
 110         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
 111
 112         TP_ARGS(mod, ip, refcnt)
 113 #endif
 114 )
 115
 116 DEFINE_EVENT(module_refcnt, module_put,
 117
 118 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 119         TP_PROTO(struct module *mod, unsigned long ip),
 120
 121         TP_ARGS(mod, ip)
 122 #else
 123         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
 124
 125         TP_ARGS(mod, ip, refcnt)
 126 #endif
 127 )
 128 #endif /* CONFIG_MODULE_UNLOAD */
 129
 130 TRACE_EVENT(module_request,
 131
 132         TP_PROTO(char *name, bool wait, unsigned long ip),
 133
 134         TP_ARGS(name, wait, ip),
 135
 136         TP_STRUCT__entry(
 137                 __field(        unsigned long,  ip              )
 138                 __field(        bool,           wait            )
 139                 __string(       name,           name            )
 140         ),
 141
 142         TP_fast_assign(
 143                 tp_assign(ip, ip)
 144                 tp_assign(wait, wait)
 145                 tp_strcpy(name, name)
 146         ),
 147
 148         TP_printk("%s wait=%d call_site=%pf",
 149                   __get_str(name), (int)__entry->wait, (void *)__entry->ip)
 150 )
 151
 152 #endif /* CONFIG_MODULES */
 153
 154 #endif /* _TRACE_MODULE_H */
 155
 156 /* This part must be outside protection */
 157 #include "../../../probes/define_trace.h"