instrumentation/events/lttng-module/module.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Because linux/module.h has tracepoints in the header, and ftrace.h
   4  * eventually includes this file, define_trace.h includes linux/module.h
   5  * But we do not want the module.h to override the TRACE_SYSTEM macro
   6  * variable that define_trace.h is processing, so we only set it
   7  * when module events are being processed, which would happen when
   8  * CREATE_TRACE_POINTS is defined.
   9  */
  10 #ifdef CREATE_TRACE_POINTS
  11 #undef TRACE_SYSTEM
  12 #define TRACE_SYSTEM module
  13 #endif
  14
  15 #if !defined(LTTNG_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ)
  16 #define LTTNG_TRACE_MODULE_H
  17
  18 #include <probes/lttng-tracepoint-event.h>
  19 #include <linux/version.h>
  20
  21 #ifdef CONFIG_MODULES
  22
  23 #ifndef _TRACE_MODULE_DEF
  24 #define _TRACE_MODULE_DEF
  25 struct module;
  26
  27 #endif
  28
  29 LTTNG_TRACEPOINT_EVENT(module_load,
  30
  31         TP_PROTO(struct module *mod),
  32
  33         TP_ARGS(mod),
  34
  35         TP_FIELDS(
  36                 ctf_integer(unsigned int, taints, mod->taints)
  37                 ctf_string(name, mod->name)
  38         )
  39 )
  40
  41 LTTNG_TRACEPOINT_EVENT(module_free,
  42
  43         TP_PROTO(struct module *mod),
  44
  45         TP_ARGS(mod),
  46
  47         TP_FIELDS(
  48                 ctf_string(name, mod->name)
  49         )
  50 )
  51
  52 #ifdef CONFIG_MODULE_UNLOAD
  53 /* trace_module_get/put are only used if CONFIG_MODULE_UNLOAD is defined */
  54
  55 LTTNG_TRACEPOINT_EVENT_CLASS(module_refcnt,
  56
  57 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  58         TP_PROTO(struct module *mod, unsigned long ip),
  59
  60         TP_ARGS(mod, ip),
  61 #else
  62         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
  63
  64         TP_ARGS(mod, ip, refcnt),
  65 #endif
  66
  67         TP_FIELDS(
  68                 ctf_integer(unsigned long, ip, ip)
  69 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0))
  70                 ctf_integer(int, refcnt, atomic_read(&mod->refcnt))
  71 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  72                 ctf_integer(int, refcnt, __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs))
  73 #else
  74                 ctf_integer(int, refcnt, refcnt)
  75 #endif
  76                 ctf_string(name, mod->name)
  77         )
  78 )
  79
  80 LTTNG_TRACEPOINT_EVENT_INSTANCE(module_refcnt, module_get,
  81
  82 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  83         TP_PROTO(struct module *mod, unsigned long ip),
  84
  85         TP_ARGS(mod, ip)
  86 #else
  87         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
  88
  89         TP_ARGS(mod, ip, refcnt)
  90 #endif
  91 )
  92
  93 LTTNG_TRACEPOINT_EVENT_INSTANCE(module_refcnt, module_put,
  94
  95 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  96         TP_PROTO(struct module *mod, unsigned long ip),
  97
  98         TP_ARGS(mod, ip)
  99 #else
 100         TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
 101
 102         TP_ARGS(mod, ip, refcnt)
 103 #endif
 104 )
 105 #endif /* CONFIG_MODULE_UNLOAD */
 106
 107 LTTNG_TRACEPOINT_EVENT(module_request,
 108
 109         TP_PROTO(char *name, bool wait, unsigned long ip),
 110
 111         TP_ARGS(name, wait, ip),
 112
 113         TP_FIELDS(
 114                 ctf_integer(unsigned long, ip, ip)
 115                 ctf_integer(bool, wait, wait)
 116                 ctf_string(name, name)
 117         )
 118 )
 119
 120 #endif /* CONFIG_MODULES */
 121
 122 #endif /* LTTNG_TRACE_MODULE_H */
 123
 124 /* This part must be outside protection */
 125 #include <probes/define_trace.h>