linux-kernel - [PATCH 13/22] perf tools: Add Intel PT support for decoding TRACESTOP packets

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Message-Id: <1440604692-26918-14-git-send-email-acme@kernel.org>
Date:	Wed, 26 Aug 2015 12:58:03 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 13/22] perf tools: Add Intel PT support for decoding TRACESTOP packets

From: Adrian Hunter <adrian.hunter@...el.com>

A TRACESTOP packet is produced when an Intel PT trace enters a defined
region of the address space at which point the tracing stops.

This patch just adds decoder support.

Support for specifying TRACESTOP regions is left until later.

For details refer to the June 2015 or later Intel 64 and IA-32
Architectures SDM Chapter 36 Intel Processor Trace.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-25-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

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 0845c5e6ad1d..22ba50224319 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1572,6 +1572,10 @@ next:
 			return intel_pt_walk_fup_tip(decoder);
 
 		case INTEL_PT_TRACESTOP:
+			decoder->pge = false;
+			decoder->continuous_period = false;
+			intel_pt_clear_tx_flags(decoder);
+			decoder->have_tma = false;
 			break;
 
 		case INTEL_PT_PSB:
@@ -1717,6 +1721,9 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
 			break;
 
 		case INTEL_PT_TRACESTOP:
+			decoder->pge = false;
+			decoder->continuous_period = false;
+			intel_pt_clear_tx_flags(decoder);
 		case INTEL_PT_TNT:
 			decoder->have_tma = false;
 			intel_pt_log("ERROR: Unexpected packet\n");
@@ -1819,6 +1826,10 @@ static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
 			return intel_pt_bug(decoder);
 
 		case INTEL_PT_TRACESTOP:
+			decoder->pge = false;
+			decoder->continuous_period = false;
+			intel_pt_clear_tx_flags(decoder);
+			decoder->have_tma = false;
 			break;
 
 		case INTEL_PT_PSB:
-- 
2.1.0

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