tracing/fastboot: change the printing of boot tracer according to bootgraph.pl

Change the boot tracer printing to make it parsable for
the scripts/bootgraph.pl script.

We have now to output two lines for each initcall, according to the
printk in do_one_initcall() in init/main.c
We need now the call's time and the return's time.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 26 insertions, 18 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 91954eb6460f..4455490d91bd 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -216,6 +216,8 @@ struct boot_trace {
         initcall_t              func;
         int                     result;
         unsigned long long      duration;
+        ktime_t                 calltime;
+        ktime_t                 rettime;
 };
 
 #ifdef CONFIG_BOOT_TRACER
diff --git a/init/main.c b/init/main.c
index 1e39a1eab190..61eb66159391 100644
--- a/init/main.c
+++ b/init/main.c
@@ -706,34 +706,32 @@ __setup("initcall_debug", initcall_debug_setup);
 int do_one_initcall(initcall_t fn)
 {
         int count = preempt_count();
-        ktime_t t0, t1, delta;
+        ktime_t delta;
         char msgbuf[64];
-        int result;
         struct boot_trace it;
 
         if (initcall_debug) {
                 it.caller = task_pid_nr(current);
                 it.func = fn;
                 printk("calling  %pF @ %i\n", fn, it.caller);
-                t0 = ktime_get();
+                it.calltime = ktime_get();
         }
 
-        result = fn();
+        it.result = fn();
 
         if (initcall_debug) {
-                t1 = ktime_get();
-                delta = ktime_sub(t1, t0);
-                it.result = result;
+                it.rettime = ktime_get();
+                delta = ktime_sub(it.rettime, it.calltime);
                 it.duration = (unsigned long long) delta.tv64 >> 20;
                 printk("initcall %pF returned %d after %Ld msecs\n", fn,
-                        result, it.duration);
+                        it.result, it.duration);
                 trace_boot(&it);
         }
 
         msgbuf[0] = 0;
 
-        if (result && result != -ENODEV && initcall_debug)
-                sprintf(msgbuf, "error code %d ", result);
+        if (it.result && it.result != -ENODEV && initcall_debug)
+                sprintf(msgbuf, "error code %d ", it.result);
 
         if (preempt_count() != count) {
                 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
@@ -747,7 +745,7 @@ int do_one_initcall(initcall_t fn)
                 printk("initcall %pF returned with %s\n", fn, msgbuf);
         }
 
-        return result;
+        return it.result;
 }
 
 
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index f2dac6f1cf06..7c15f3e68ba3 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -52,16 +52,24 @@ static enum print_line_t initcall_print_line(struct trace_iterator *iter)
         struct trace_boot *field = (struct trace_boot *)entry;
         struct boot_trace *it = &field->initcall;
         struct trace_seq *s = &iter->seq;
+        struct timespec calltime = ktime_to_timespec(it->calltime);
+        struct timespec rettime = ktime_to_timespec(it->rettime);
 
         if (entry->type == TRACE_BOOT) {
-                ret = trace_seq_printf(s, "%pF called from %i "
-                                       "returned %d after %lld msecs\n",
-                                       it->func, it->caller, it->result,
-                                       it->duration);
-                if (ret)
-                        return TRACE_TYPE_HANDLED;
-                else
+                ret = trace_seq_printf(s, "[%5ld.%06ld] calling  %pF @ %i\n",
+                                          calltime.tv_sec,
+                                          calltime.tv_nsec,
+                                          it->func, it->caller);
+                if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
+                ret = trace_seq_printf(s, "[%5ld.%06ld] initcall %pF "
+                                          "returned %d after %lld msecs\n",
+                                          rettime.tv_sec,
+                                          rettime.tv_nsec,
+                                          it->func, it->result, it->duration);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_HANDLED;
         }
         return TRACE_TYPE_UNHANDLED;
 }