Add kernel probes for supplementary subsystems

[lttng-modules.git] / instrumentation / events / lttng-module / module.h

diff --git a/instrumentation/events/lttng-module/module.h b/instrumentation/events/lttng-module/module.h
new file mode 100644 (file)
index 0000000..2e83431
--- /dev/null
+++ b/instrumentation/events/lttng-module/module.h
@@ -0,0 +1,134 @@
+/*
+ * Because linux/module.h has tracepoints in the header, and ftrace.h
+ * eventually includes 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
+
+#ifndef _TRACE_MODULE_DEF
+#define _TRACE_MODULE_DEF
+struct module;
+
+#define show_module_flags(flags) __print_flags(flags, "",      \
+       { (1UL << TAINT_PROPRIETARY_MODULE),    "P" },          \
+       { (1UL << TAINT_FORCED_MODULE),         "F" },          \
+       { (1UL << TAINT_CRAP),                  "C" })
+#endif
+
+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(
+               tp_assign(taints, mod->taints);
+               tp_strcpy(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(
+               tp_strcpy(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(
+               tp_assign(ip, ip);
+               tp_assign(refcnt, __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs));
+               tp_strcpy(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(
+               tp_assign(ip, ip);
+               tp_assign(wait, wait);
+               tp_strcpy(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 "../../../probes/define_trace.h"