perf probe: Fix to show inlined function callsite without entry_pc

perf probe: Fix to show inlined function callsite without entry_pc

BugLink: https://bugs.launchpad.net/bugs/1860490
[ Upstream commit 18e21eb671dc87a4f0546ba505a89ea93598a634 ]

Fix 'perf probe --line' option to show inlined function callsite lines
even if the function DIE has only ranges.

Without this:

  # perf probe -L amd_put_event_constraints
  ...
      2  {
      3         if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))
                        __amd_put_nb_event_constraints(cpuc, event);
      5  }

With this patch:

  # perf probe -L amd_put_event_constraints
  ...
      2  {
      3         if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))
      4                 __amd_put_nb_event_constraints(cpuc, event);
      5  }

Committer testing:

Before:

  [root@quaco ~]# perf probe -L amd_put_event_constraints
  <amd_put_event_constraints@/usr/src/debug/kernel-5.2.fc30/linux-5.2.18-200.fc30.x86_64/arch/x86/events/amd/core.c:0>
        0  static void amd_put_event_constraints(struct cpu_hw_events *cpuc,
                                                struct perf_event *event)
        2  {
        3         if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))
                          __amd_put_nb_event_constraints(cpuc, event);
        5  }

           PMU_FORMAT_ATTR(event, "config:0-7,32-35");
           PMU_FORMAT_ATTR(umask, "config:8-15"   );

  [root@quaco ~]#

After:

  [root@quaco ~]# perf probe -L amd_put_event_constraints
  <amd_put_event_constraints@/usr/src/debug/kernel-5.2.fc30/linux-5.2.18-200.fc30.x86_64/arch/x86/events/amd/core.c:0>
        0  static void amd_put_event_constraints(struct cpu_hw_events *cpuc,
                                                struct perf_event *event)
        2  {
        3         if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))
        4                 __amd_put_nb_event_constraints(cpuc, event);
        5  }

           PMU_FORMAT_ATTR(event, "config:0-7,32-35");
           PMU_FORMAT_ATTR(umask, "config:8-15"   );

  [root@quaco ~]# perf probe amd_put_event_constraints:4
  Added new event:
    probe:amd_put_event_constraints (on amd_put_event_constraints:4)

  You can now use it in all perf tools, such as:

  	perf record -e probe:amd_put_event_constraints -aR sleep 1

  [root@quaco ~]#

  [root@quaco ~]# perf probe -l
    probe:amd_put_event_constraints (on amd_put_event_constraints:4@arch/x86/events/amd/core.c)
    probe:clear_tasks_mm_cpumask (on clear_tasks_mm_cpumask@kernel/cpu.c)
  [root@quaco ~]#

Using it:

  [root@quaco ~]# perf trace -e probe:*
  ^C[root@quaco ~]#

Ok, Intel system here... :-)

Fixes: 4cc9cec636e7 ("perf probe: Introduce lines walker interface")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/157199322107.8075.12659099000567865708.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>