perf intel-pt: Implement decoder flags for trace begin / end

Have the Intel PT decoder implement the new Intel PT decoder flags for
trace begin / end.

Previously, the decoder would indicate begin / end by a branch from / to
zero. That hides useful information, in particular when a trace ends
with a call. That happens when using address filters, for example:

  $ perf record -e intel_pt/cyc,mtc_period=0,noretcomp/u --filter='filter main @ /bin/uname ' uname Linux
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.031 MB perf.data ]

Before:

  $ perf script --itrace=cre -Ftime,flags,ip,sym,symoff,addr --ns
   7249.622183310:   tr strt         0 [unknown] =>   401590 main+0x0
   7249.622183311:   call       4015b9 main+0x29 =>        0 [unknown]
   7249.622183711:   tr strt         0 [unknown] =>   4015be main+0x2e
   7249.622183714:   call       4015c8 main+0x38 =>        0 [unknown]
   7249.622247731:   tr strt         0 [unknown] =>   4015cd main+0x3d
   7249.622247760:   call       4015d7 main+0x47 =>        0 [unknown]
   7249.622248340:   tr strt         0 [unknown] =>   4015dc main+0x4c
   7249.622248341:   call       4015e1 main+0x51 =>        0 [unknown]
   7249.622248681:   tr strt         0 [unknown] =>   4015e6 main+0x56
   7249.622248682:   call       4015eb main+0x5b =>        0 [unknown]
   7249.622248970:   tr strt         0 [unknown] =>   4015f0 main+0x60
   7249.622248971:   call       401612 main+0x82 =>        0 [unknown]
   7249.622249757:   tr strt         0 [unknown] =>   401617 main+0x87
   7249.622249770:   call       401847 main+0x2b7 =>        0 [unknown]
   7249.622250606:   tr strt         0 [unknown] =>   40184c main+0x2bc
   7249.622250612:   call       4019bf main+0x42f =>        0 [unknown]
   7249.622256823:   tr strt         0 [unknown] =>   4019c4 main+0x434
   7249.622256863:   call       4019f5 main+0x465 =>        0 [unknown]
   7249.622264217:   tr strt         0 [unknown] =>   4019fa main+0x46a
   7249.622264235:   call       401832 main+0x2a2 =>        0 [unknown]

After:

  $ perf script --itrace=cre -Ftime,flags,ip,sym,symoff,addr --ns
   7249.622183310:   tr strt              0 [unknown] =>   401590 main+0x0
   7249.622183311:   tr end  call    4015b9 main+0x29 =>   401ef0 set_program_name+0x0
   7249.622183711:   tr strt              0 [unknown] =>   4015be main+0x2e
   7249.622183714:   tr end  call    4015c8 main+0x38 =>   4014b0 setlocale@plt+0x0
   7249.622247731:   tr strt              0 [unknown] =>   4015cd main+0x3d
   7249.622247760:   tr end  call    4015d7 main+0x47 =>   4012d0 bindtextdomain@plt+0x0
   7249.622248340:   tr strt              0 [unknown] =>   4015dc main+0x4c
   7249.622248341:   tr end  call    4015e1 main+0x51 =>   4012b0 textdomain@plt+0x0
   7249.622248681:   tr strt              0 [unknown] =>   4015e6 main+0x56
   7249.622248682:   tr end  call    4015eb main+0x5b =>   404340 atexit+0x0
   7249.622248970:   tr strt              0 [unknown] =>   4015f0 main+0x60
   7249.622248971:   tr end  call    401612 main+0x82 =>   401320 getopt_long@plt+0x0
   7249.622249757:   tr strt              0 [unknown] =>   401617 main+0x87
   7249.622249770:   tr end  call    401847 main+0x2b7 =>   401360 uname@plt+0x0
   7249.622250606:   tr strt              0 [unknown] =>   40184c main+0x2bc
   7249.622250612:   tr end  call    4019bf main+0x42f =>   401b10 print_element+0x0
   7249.622256823:   tr strt              0 [unknown] =>   4019c4 main+0x434
   7249.622256863:   tr end  call    4019f5 main+0x465 =>   401340 __overflow@plt+0x0
   7249.622264217:   tr strt              0 [unknown] =>   4019fa main+0x46a
   7249.622264235:   tr end  call    401832 main+0x2a2 =>   401520 exit@plt+0x0

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20180920130048.31432-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 11 deletions

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index d404bed7003a..58f6a9ceb590 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1165,7 +1165,7 @@ static int intel_pt_walk_tip(struct intel_pt_decoder *decoder)
                 decoder->pge = false;
                 decoder->continuous_period = false;
                 decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
-                decoder->state.to_ip = 0;
+                decoder->state.type |= INTEL_PT_TRACE_END;
                 return 0;
         }
         if (err == INTEL_PT_RETURN)
@@ -1179,9 +1179,13 @@ static int intel_pt_walk_tip(struct intel_pt_decoder *decoder)
                         decoder->continuous_period = false;
                         decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
                         decoder->state.from_ip = decoder->ip;
-                        decoder->state.to_ip = 0;
-                        if (decoder->packet.count != 0)
+                        if (decoder->packet.count == 0) {
+                                decoder->state.to_ip = 0;
+                        } else {
+                                decoder->state.to_ip = decoder->last_ip;
                                 decoder->ip = decoder->last_ip;
+                        }
+                        decoder->state.type |= INTEL_PT_TRACE_END;
                 } else {
                         decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
                         decoder->state.from_ip = decoder->ip;
@@ -1208,7 +1212,8 @@ static int intel_pt_walk_tip(struct intel_pt_decoder *decoder)
                         decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
                         decoder->ip = to_ip;
                         decoder->state.from_ip = decoder->ip;
-                        decoder->state.to_ip = 0;
+                        decoder->state.to_ip = to_ip;
+                        decoder->state.type |= INTEL_PT_TRACE_END;
                         return 0;
                 }
                 intel_pt_log_at("ERROR: Conditional branch when expecting indirect branch",
@@ -1640,14 +1645,15 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
 
                 case INTEL_PT_TIP_PGD:
                         decoder->state.from_ip = decoder->ip;
-                        decoder->state.to_ip = 0;
-                        if (decoder->packet.count != 0) {
+                        if (decoder->packet.count == 0) {
+                                decoder->state.to_ip = 0;
+                        } else {
                                 intel_pt_set_ip(decoder);
-                                intel_pt_log("Omitting PGD ip " x64_fmt "\n",
-                                             decoder->ip);
+                                decoder->state.to_ip = decoder->ip;
                         }
                         decoder->pge = false;
                         decoder->continuous_period = false;
+                        decoder->state.type |= INTEL_PT_TRACE_END;
                         return 0;
 
                 case INTEL_PT_TIP_PGE:
@@ -1661,6 +1667,7 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
                                 intel_pt_set_ip(decoder);
                                 decoder->state.to_ip = decoder->ip;
                         }
+                        decoder->state.type |= INTEL_PT_TRACE_BEGIN;
                         return 0;
 
                 case INTEL_PT_TIP:
@@ -1739,6 +1746,7 @@ next:
                         intel_pt_set_ip(decoder);
                         decoder->state.from_ip = 0;
                         decoder->state.to_ip = decoder->ip;
+                        decoder->state.type |= INTEL_PT_TRACE_BEGIN;
                         return 0;
                 }
 
@@ -2077,9 +2085,13 @@ static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
                         decoder->pge = decoder->packet.type != INTEL_PT_TIP_PGD;
                         if (intel_pt_have_ip(decoder))
                                 intel_pt_set_ip(decoder);
-                        if (decoder->ip)
-                                return 0;
-                        break;
+                        if (!decoder->ip)
+                                break;
+                        if (decoder->packet.type == INTEL_PT_TIP_PGE)
+                                decoder->state.type |= INTEL_PT_TRACE_BEGIN;
+                        if (decoder->packet.type == INTEL_PT_TIP_PGD)
+                                decoder->state.type |= INTEL_PT_TRACE_END;
+                        return 0;
 
                 case INTEL_PT_FUP:
                         if (intel_pt_have_ip(decoder))