[PATCH 08/22] perf tools: Pass Intel PT information for decoding MTC and CYC

[Arnaldo Carvalho de Melo <acme@kernel.org>]

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

Record additional information in the AUXTRACE_INFO event in preparation
for decoding MTC and CYC packets.  Pass the information to the decoder.

The AUXTRACE_INFO record can be extended by using the size to indicate
the presence of new members.

The additional information includes PMU config bit positions and the TSC
to CTC (hardware crystal clock) ratio needed to decode MTC packets.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-20-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/arch/x86/util/intel-pt.c                | 24 ++++++++-
 .../perf/util/intel-pt-decoder/intel-pt-decoder.h  |  3 ++
 tools/perf/util/intel-pt.c                         | 62 ++++++++++++++++++----
 tools/perf/util/intel-pt.h                         |  5 ++
 4 files changed, 83 insertions(+), 11 deletions(-)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 145975b003a7..faae9289bcf6 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -18,6 +18,7 @@
 #include <linux/types.h>
 #include <linux/bitops.h>
 #include <linux/log2.h>
+#include <cpuid.h>
 
 #include "../../perf.h"
 #include "../../util/session.h"
@@ -261,6 +262,15 @@ static size_t intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused
 	return INTEL_PT_AUXTRACE_PRIV_SIZE;
 }
 
+static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
+{
+	unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
+
+	__get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
+	*n = ebx;
+	*d = eax;
+}
+
 static int intel_pt_info_fill(struct auxtrace_record *itr,
 			      struct perf_session *session,
 			      struct auxtrace_info_event *auxtrace_info,
@@ -272,7 +282,8 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	struct perf_event_mmap_page *pc;
 	struct perf_tsc_conversion tc = { .time_mult = 0, };
 	bool cap_user_time_zero = false, per_cpu_mmaps;
-	u64 tsc_bit, noretcomp_bit;
+	u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
+	u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
 	int err;
 
 	if (priv_size != INTEL_PT_AUXTRACE_PRIV_SIZE)
@@ -281,6 +292,12 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
 	intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
 			     &noretcomp_bit);
+	intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit);
+	mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
+					      "mtc_period");
+	intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit);
+
+	intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
 
 	if (!session->evlist->nr_mmaps)
 		return -EINVAL;
@@ -311,6 +328,11 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch;
 	auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode;
 	auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps;
+	auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit;
+	auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits;
+	auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n;
+	auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
+	auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
 
 	return 0;
 }
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
index cbf57044c385..56cc47baca11 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
@@ -87,6 +87,9 @@ struct intel_pt_params {
 	uint64_t period;
 	enum intel_pt_period_type period_type;
 	unsigned max_non_turbo_ratio;
+	unsigned int mtc_period;
+	uint32_t tsc_ctc_ratio_n;
+	uint32_t tsc_ctc_ratio_d;
 };
 
 struct intel_pt_decoder;
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 3b34a64195ea..bb41c20e6005 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -91,6 +91,11 @@ struct intel_pt {
 	bool synth_needs_swap;
 
 	u64 tsc_bit;
+	u64 mtc_bit;
+	u64 mtc_freq_bits;
+	u32 tsc_ctc_ratio_n;
+	u32 tsc_ctc_ratio_d;
+	u64 cyc_bit;
 	u64 noretcomp_bit;
 	unsigned max_non_turbo_ratio;
 };
@@ -568,6 +573,25 @@ static bool intel_pt_return_compression(struct intel_pt *pt)
 	return true;
 }
 
+static unsigned int intel_pt_mtc_period(struct intel_pt *pt)
+{
+	struct perf_evsel *evsel;
+	unsigned int shift;
+	u64 config;
+
+	if (!pt->mtc_freq_bits)
+		return 0;
+
+	for (shift = 0, config = pt->mtc_freq_bits; !(config & 1); shift++)
+		config >>= 1;
+
+	evlist__for_each(pt->session->evlist, evsel) {
+		if (intel_pt_get_config(pt, &evsel->attr, &config))
+			return (config & pt->mtc_freq_bits) >> shift;
+	}
+	return 0;
+}
+
 static bool intel_pt_timeless_decoding(struct intel_pt *pt)
 {
 	struct perf_evsel *evsel;
@@ -668,6 +692,9 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
 	params.data = ptq;
 	params.return_compression = intel_pt_return_compression(pt);
 	params.max_non_turbo_ratio = pt->max_non_turbo_ratio;
+	params.mtc_period = intel_pt_mtc_period(pt);
+	params.tsc_ctc_ratio_n = pt->tsc_ctc_ratio_n;
+	params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d;
 
 	if (pt->synth_opts.instructions) {
 		if (pt->synth_opts.period) {
@@ -1751,16 +1778,20 @@ static struct perf_evsel *intel_pt_find_sched_switch(struct perf_evlist *evlist)
 }
 
 static const char * const intel_pt_info_fmts[] = {
-	[INTEL_PT_PMU_TYPE]		= "  PMU Type           %"PRId64"\n",
-	[INTEL_PT_TIME_SHIFT]		= "  Time Shift         %"PRIu64"\n",
-	[INTEL_PT_TIME_MULT]		= "  Time Muliplier     %"PRIu64"\n",
-	[INTEL_PT_TIME_ZERO]		= "  Time Zero          %"PRIu64"\n",
-	[INTEL_PT_CAP_USER_TIME_ZERO]	= "  Cap Time Zero      %"PRId64"\n",
-	[INTEL_PT_TSC_BIT]		= "  TSC bit            %#"PRIx64"\n",
-	[INTEL_PT_NORETCOMP_BIT]	= "  NoRETComp bit      %#"PRIx64"\n",
-	[INTEL_PT_HAVE_SCHED_SWITCH]	= "  Have sched_switch  %"PRId64"\n",
-	[INTEL_PT_SNAPSHOT_MODE]	= "  Snapshot mode      %"PRId64"\n",
-	[INTEL_PT_PER_CPU_MMAPS]	= "  Per-cpu maps       %"PRId64"\n",
+	[INTEL_PT_PMU_TYPE]		= "  PMU Type            %"PRId64"\n",
+	[INTEL_PT_TIME_SHIFT]		= "  Time Shift          %"PRIu64"\n",
+	[INTEL_PT_TIME_MULT]		= "  Time Muliplier      %"PRIu64"\n",
+	[INTEL_PT_TIME_ZERO]		= "  Time Zero           %"PRIu64"\n",
+	[INTEL_PT_CAP_USER_TIME_ZERO]	= "  Cap Time Zero       %"PRId64"\n",
+	[INTEL_PT_TSC_BIT]		= "  TSC bit             %#"PRIx64"\n",
+	[INTEL_PT_NORETCOMP_BIT]	= "  NoRETComp bit       %#"PRIx64"\n",
+	[INTEL_PT_HAVE_SCHED_SWITCH]	= "  Have sched_switch   %"PRId64"\n",
+	[INTEL_PT_SNAPSHOT_MODE]	= "  Snapshot mode       %"PRId64"\n",
+	[INTEL_PT_PER_CPU_MMAPS]	= "  Per-cpu maps        %"PRId64"\n",
+	[INTEL_PT_MTC_BIT]		= "  MTC bit             %#"PRIx64"\n",
+	[INTEL_PT_TSC_CTC_N]		= "  TSC:CTC numerator   %"PRIu64"\n",
+	[INTEL_PT_TSC_CTC_D]		= "  TSC:CTC denominator %"PRIu64"\n",
+	[INTEL_PT_CYC_BIT]		= "  CYC bit             %#"PRIx64"\n",
 };
 
 static void intel_pt_print_info(u64 *arr, int start, int finish)
@@ -1812,6 +1843,17 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 	intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_PMU_TYPE,
 			    INTEL_PT_PER_CPU_MMAPS);
 
+	if (auxtrace_info->header.size >= sizeof(struct auxtrace_info_event) +
+					(sizeof(u64) * INTEL_PT_CYC_BIT)) {
+		pt->mtc_bit = auxtrace_info->priv[INTEL_PT_MTC_BIT];
+		pt->mtc_freq_bits = auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS];
+		pt->tsc_ctc_ratio_n = auxtrace_info->priv[INTEL_PT_TSC_CTC_N];
+		pt->tsc_ctc_ratio_d = auxtrace_info->priv[INTEL_PT_TSC_CTC_D];
+		pt->cyc_bit = auxtrace_info->priv[INTEL_PT_CYC_BIT];
+		intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_MTC_BIT,
+				    INTEL_PT_CYC_BIT);
+	}
+
 	pt->timeless_decoding = intel_pt_timeless_decoding(pt);
 	pt->have_tsc = intel_pt_have_tsc(pt);
 	pt->sampling_mode = false;
diff --git a/tools/perf/util/intel-pt.h b/tools/perf/util/intel-pt.h
index a1bfe93473ba..0065949df693 100644
--- a/tools/perf/util/intel-pt.h
+++ b/tools/perf/util/intel-pt.h
@@ -29,6 +29,11 @@ enum {
 	INTEL_PT_HAVE_SCHED_SWITCH,
 	INTEL_PT_SNAPSHOT_MODE,
 	INTEL_PT_PER_CPU_MMAPS,
+	INTEL_PT_MTC_BIT,
+	INTEL_PT_MTC_FREQ_BITS,
+	INTEL_PT_TSC_CTC_N,
+	INTEL_PT_TSC_CTC_D,
+	INTEL_PT_CYC_BIT,
 	INTEL_PT_AUXTRACE_PRIV_MAX,
 };
 
-- 
2.1.0