1 files changed, 173 insertions, 0 deletions

diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
new file mode 100644
index 000000000000..a510b75ac304
--- /dev/null
+++ b/include/trace/events/signal.h
@@ -0,0 +1,173 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM signal
+
+#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SIGNAL_H
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/tracepoint.h>
+
+#define TP_STORE_SIGINFO(__entry, info)                         \
+        do {                                                    \
+                if (info == SEND_SIG_NOINFO) {                  \
+                        __entry->errno  = 0;                    \
+                        __entry->code   = SI_USER;              \
+                } else if (info == SEND_SIG_PRIV) {             \
+                        __entry->errno  = 0;                    \
+                        __entry->code   = SI_KERNEL;            \
+                } else {                                        \
+                        __entry->errno  = info->si_errno;       \
+                        __entry->code   = info->si_code;        \
+                }                                               \
+        } while (0)
+
+/**
+ * signal_generate - called when a signal is generated
+ * @sig: signal number
+ * @info: pointer to struct siginfo
+ * @task: pointer to struct task_struct
+ *
+ * Current process sends a 'sig' signal to 'task' process with
+ * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
+ * 'info' is not a pointer and you can't access its field. Instead,
+ * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
+ * means that si_code is SI_KERNEL.
+ */
+TRACE_EVENT(signal_generate,
+
+        TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
+
+        TP_ARGS(sig, info, task),
+
+        TP_STRUCT__entry(
+                __field(        int,    sig                     )
+                __field(        int,    errno                   )
+                __field(        int,    code                    )
+                __array(        char,   comm,   TASK_COMM_LEN   )
+                __field(        pid_t,  pid                     )
+        ),
+
+        TP_fast_assign(
+                __entry->sig    = sig;
+                TP_STORE_SIGINFO(__entry, info);
+                memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
+                __entry->pid    = task->pid;
+        ),
+
+        TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
+                  __entry->sig, __entry->errno, __entry->code,
+                  __entry->comm, __entry->pid)
+);
+
+/**
+ * signal_deliver - called when a signal is delivered
+ * @sig: signal number
+ * @info: pointer to struct siginfo
+ * @ka: pointer to struct k_sigaction
+ *
+ * A 'sig' signal is delivered to current process with 'info' siginfo,
+ * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
+ * SIG_DFL.
+ * Note that some signals reported by signal_generate tracepoint can be
+ * lost, ignored or modified (by debugger) before hitting this tracepoint.
+ * This means, this can show which signals are actually delivered, but
+ * matching generated signals and delivered signals may not be correct.
+ */
+TRACE_EVENT(signal_deliver,
+
+        TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
+
+        TP_ARGS(sig, info, ka),
+
+        TP_STRUCT__entry(
+                __field(        int,            sig             )
+                __field(        int,            errno           )
+                __field(        int,            code            )
+                __field(        unsigned long,  sa_handler      )
+                __field(        unsigned long,  sa_flags        )
+        ),
+
+        TP_fast_assign(
+                __entry->sig    = sig;
+                TP_STORE_SIGINFO(__entry, info);
+                __entry->sa_handler     = (unsigned long)ka->sa.sa_handler;
+                __entry->sa_flags       = ka->sa.sa_flags;
+        ),
+
+        TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
+                  __entry->sig, __entry->errno, __entry->code,
+                  __entry->sa_handler, __entry->sa_flags)
+);
+
+/**
+ * signal_overflow_fail - called when signal queue is overflow
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel fails to generate 'sig' signal with 'info' siginfo, because
+ * siginfo queue is overflow, and the signal is dropped.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of RT signals.
+ */
+TRACE_EVENT(signal_overflow_fail,
+
+        TP_PROTO(int sig, int group, struct siginfo *info),
+
+        TP_ARGS(sig, group, info),
+
+        TP_STRUCT__entry(
+                __field(        int,    sig     )
+                __field(        int,    group   )
+                __field(        int,    errno   )
+                __field(        int,    code    )
+        ),
+
+        TP_fast_assign(
+                __entry->sig    = sig;
+                __entry->group  = group;
+                TP_STORE_SIGINFO(__entry, info);
+        ),
+
+        TP_printk("sig=%d group=%d errno=%d code=%d",
+                  __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
+
+/**
+ * signal_lose_info - called when siginfo is lost
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
+ * queue is overflow.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of non-RT signals.
+ */
+TRACE_EVENT(signal_lose_info,
+
+        TP_PROTO(int sig, int group, struct siginfo *info),
+
+        TP_ARGS(sig, group, info),
+
+        TP_STRUCT__entry(
+                __field(        int,    sig     )
+                __field(        int,    group   )
+                __field(        int,    errno   )
+                __field(        int,    code    )
+        ),
+
+        TP_fast_assign(
+                __entry->sig    = sig;
+                __entry->group  = group;
+                TP_STORE_SIGINFO(__entry, info);
+        ),
+
+        TP_printk("sig=%d group=%d errno=%d code=%d",
+                  __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
+#endif /* _TRACE_SIGNAL_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>