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         TP_PROTO(struct module *mod, unsigned long ip),
  58
  59         TP_ARGS(mod, ip),
  60
  61         TP_FIELDS(
  62                 ctf_integer(unsigned long, ip, ip)
  63 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0))
  64                 ctf_integer(int, refcnt, atomic_read(&mod->refcnt))
  65 #else
  66                 ctf_integer(int, refcnt, __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs))
  67 #endif
  68                 ctf_string(name, mod->name)
  69         )
  70 )
  71
  72 LTTNG_TRACEPOINT_EVENT_INSTANCE(module_refcnt, module_get,
  73
  74         TP_PROTO(struct module *mod, unsigned long ip),
  75
  76         TP_ARGS(mod, ip)
  77 )
  78
  79 LTTNG_TRACEPOINT_EVENT_INSTANCE(module_refcnt, module_put,
  80
  81         TP_PROTO(struct module *mod, unsigned long ip),
  82
  83         TP_ARGS(mod, ip)
  84 )
  85 #endif /* CONFIG_MODULE_UNLOAD */
  86
  87 LTTNG_TRACEPOINT_EVENT(module_request,
  88
  89         TP_PROTO(char *name, bool wait, unsigned long ip),
  90
  91         TP_ARGS(name, wait, ip),
  92
  93         TP_FIELDS(
  94                 ctf_integer(unsigned long, ip, ip)
  95                 ctf_integer(bool, wait, wait)
  96                 ctf_string(name, name)
  97         )
  98 )
  99
 100 #endif /* CONFIG_MODULES */
 101
 102 #endif /* LTTNG_TRACE_MODULE_H */
 103
 104 /* This part must be outside protection */
 105 #include <probes/define_trace.h>