From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Andi Kleen <ak@linux.intel.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH V2 01/12] perf intel-pt: Fix FUP packet state
Date: Fri, 10 Jul 2020 18:10:53 +0300 [thread overview]
Message-ID: <20200710151104.15137-2-adrian.hunter@intel.com> (raw)
In-Reply-To: <20200710151104.15137-1-adrian.hunter@intel.com>
While walking code towards a FUP ip, the packet state is
INTEL_PT_STATE_FUP or INTEL_PT_STATE_FUP_NO_TIP. That was mishandled
resulting in the state becoming INTEL_PT_STATE_IN_SYNC prematurely.
The result was an occasional lost EXSTOP event.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
---
.../util/intel-pt-decoder/intel-pt-decoder.c | 21 +++++++------------
1 file changed, 7 insertions(+), 14 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 f8ccfd6be0ee..75c4bd74d521 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1164,6 +1164,7 @@ static int intel_pt_walk_fup(struct intel_pt_decoder *decoder)
return 0;
if (err == -EAGAIN ||
intel_pt_fup_with_nlip(decoder, &intel_pt_insn, ip, err)) {
+ decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
if (intel_pt_fup_event(decoder))
return 0;
return -EAGAIN;
@@ -1942,17 +1943,13 @@ static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
}
if (decoder->set_fup_mwait)
no_tip = true;
+ if (no_tip)
+ decoder->pkt_state = INTEL_PT_STATE_FUP_NO_TIP;
+ else
+ decoder->pkt_state = INTEL_PT_STATE_FUP;
err = intel_pt_walk_fup(decoder);
- if (err != -EAGAIN) {
- if (err)
- return err;
- if (no_tip)
- decoder->pkt_state =
- INTEL_PT_STATE_FUP_NO_TIP;
- else
- decoder->pkt_state = INTEL_PT_STATE_FUP;
- return 0;
- }
+ if (err != -EAGAIN)
+ return err;
if (no_tip) {
no_tip = false;
break;
@@ -2599,15 +2596,11 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
err = intel_pt_walk_tip(decoder);
break;
case INTEL_PT_STATE_FUP:
- decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
err = intel_pt_walk_fup(decoder);
if (err == -EAGAIN)
err = intel_pt_walk_fup_tip(decoder);
- else if (!err)
- decoder->pkt_state = INTEL_PT_STATE_FUP;
break;
case INTEL_PT_STATE_FUP_NO_TIP:
- decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
err = intel_pt_walk_fup(decoder);
if (err == -EAGAIN)
err = intel_pt_walk_trace(decoder);
--
2.17.1
next prev parent reply other threads:[~2020-07-10 15:13 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 15:10 [PATCH V2 00/12] perf intel-pt: Add support for decoding FUP/TIP only Adrian Hunter
2020-07-10 15:10 ` Adrian Hunter [this message]
2020-07-10 15:10 ` [PATCH V2 02/12] perf intel-pt: Fix duplicate branch after CBR Adrian Hunter
2020-07-10 15:10 ` [PATCH V2 03/12] perf tools: Improve aux_output not supported error Adrian Hunter
2020-07-10 15:10 ` [PATCH V2 04/12] perf auxtrace: Add missing itrace options to help text Adrian Hunter
2020-07-10 15:10 ` [PATCH V2 05/12] perf auxtrace: Add optional error flags to the itrace 'e' option Adrian Hunter
2020-07-10 15:10 ` [PATCH V2 06/12] perf intel-pt: Use itrace error flags to suppress some errors Adrian Hunter
2020-07-10 15:10 ` [PATCH V2 07/12] perf auxtrace: Add optional log flags to the itrace 'd' option Adrian Hunter
2020-07-10 15:11 ` [PATCH V2 08/12] perf intel-pt: Use itrace debug log flags to suppress some messages Adrian Hunter
2020-07-10 15:11 ` [PATCH V2 09/12] perf intel-pt: Time filter logged perf events Adrian Hunter
2020-07-10 15:11 ` [PATCH V2 10/12] perf auxtrace: Add itrace 'q' option for quicker, less detailed decoding Adrian Hunter
2020-07-20 22:27 ` Andi Kleen
2020-07-10 15:11 ` [PATCH V2 11/12] perf intel-pt: Add support for decoding FUP/TIP only Adrian Hunter
2020-07-10 15:11 ` [PATCH V2 12/12] perf intel-pt: Add support for decoding PSB+ only Adrian Hunter
2020-07-20 22:25 ` Andi Kleen
2020-08-06 12:03 ` Arnaldo Carvalho de Melo
2020-08-04 13:34 ` [PATCH V2 00/12] perf intel-pt: Add support for decoding FUP/TIP only Adrian Hunter
2020-08-04 14:59 ` Arnaldo Carvalho de Melo
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