[tip:perf/core] perf tools: Pass Intel PT information for decoding MTC and CYC

From: tip-bot for Adrian Hunter
Date: Fri Aug 28 2015 - 02:39:06 EST

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Commit-ID: 11fa7cb86b56d3610043ba2ac6cbd81feab4b7c4
Gitweb: http://git.kernel.org/tip/11fa7cb86b56d3610043ba2ac6cbd81feab4b7c4
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Fri, 17 Jul 2015 19:33:54 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 24 Aug 2015 17:46:43 -0300

perf tools: Pass Intel PT information for decoding MTC and CYC

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@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1437150840-31811-20-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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 145975b..faae928 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 cbf5704..56cc47b 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 3b34a64..bb41c20 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 a1bfe93..0065949 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,
};

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Next message: tip-bot for Adrian Hunter: "[tip:perf/core] perf tools: Add Intel PT support for decoding MTC packets"
Previous message: Raghavendra K T: "Re: [PATCH RFC V2 2/2] net: Optimize snmp stat aggregation by walking all the percpu data at once"
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