Re: [PATCH V6 08/17] perf tools: Add Intel PT support

[Arnaldo Carvalho de Melo]

Em Fri, May 29, 2015 at 04:33:36PM +0300, Adrian Hunter escreveu:
> Add support for Intel Processor Trace.
> 
> Intel PT support fits within the new auxtrace infrastructure.
> Recording is supporting by identifying the Intel PT PMU,
> parsing options and setting up events.  Decoding is supported
> by queuing up trace data by cpu or thread and then decoding
> synchronously delivering synthesized event samples into the
> session processing for tools to consume.

So, at this point what commands should I use to test this? I expected to
be able to have some command here, in this changeset log, telling me
that what has been applied so far + this "Add Intel PT support", can be
used in such and such a fashion, obtaining this and that output.

Now I'll go back and look at the cover letter to see what I can do at
this point and with access to a Broadwell class machine.

- Arnaldo
 
> Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
>  tools/perf/arch/x86/util/Build      |    2 +
>  tools/perf/arch/x86/util/intel-pt.c |  752 ++++++++++++++
>  tools/perf/util/Build               |    1 +
>  tools/perf/util/intel-pt.c          | 1889 +++++++++++++++++++++++++++++++++++
>  tools/perf/util/intel-pt.h          |   51 +
>  5 files changed, 2695 insertions(+)
>  create mode 100644 tools/perf/arch/x86/util/intel-pt.c
>  create mode 100644 tools/perf/util/intel-pt.c
>  create mode 100644 tools/perf/util/intel-pt.h
> 
> diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
> index cfbccc4..1396088 100644
> --- a/tools/perf/arch/x86/util/Build
> +++ b/tools/perf/arch/x86/util/Build
> @@ -6,3 +6,5 @@ libperf-$(CONFIG_DWARF) += dwarf-regs.o
>  
>  libperf-$(CONFIG_LIBUNWIND)          += unwind-libunwind.o
>  libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
> +
> +libperf-$(CONFIG_AUXTRACE) += intel-pt.o
> diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
> new file mode 100644
> index 0000000..da7d2c1
> --- /dev/null
> +++ b/tools/perf/arch/x86/util/intel-pt.c
> @@ -0,0 +1,752 @@
> +/*
> + * intel_pt.c: Intel Processor Trace support
> + * Copyright (c) 2013-2015, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <stdbool.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/bitops.h>
> +#include <linux/log2.h>
> +
> +#include "../../perf.h"
> +#include "../../util/session.h"
> +#include "../../util/event.h"
> +#include "../../util/evlist.h"
> +#include "../../util/evsel.h"
> +#include "../../util/cpumap.h"
> +#include "../../util/parse-options.h"
> +#include "../../util/parse-events.h"
> +#include "../../util/pmu.h"
> +#include "../../util/debug.h"
> +#include "../../util/auxtrace.h"
> +#include "../../util/tsc.h"
> +#include "../../util/intel-pt.h"
> +
> +#define KiB(x) ((x) * 1024)
> +#define MiB(x) ((x) * 1024 * 1024)
> +#define KiB_MASK(x) (KiB(x) - 1)
> +#define MiB_MASK(x) (MiB(x) - 1)
> +
> +#define INTEL_PT_DEFAULT_SAMPLE_SIZE	KiB(4)
> +
> +#define INTEL_PT_MAX_SAMPLE_SIZE	KiB(60)
> +
> +#define INTEL_PT_PSB_PERIOD_NEAR	256
> +
> +struct intel_pt_snapshot_ref {
> +	void *ref_buf;
> +	size_t ref_offset;
> +	bool wrapped;
> +};
> +
> +struct intel_pt_recording {
> +	struct auxtrace_record		itr;
> +	struct perf_pmu			*intel_pt_pmu;
> +	int				have_sched_switch;
> +	struct perf_evlist		*evlist;
> +	bool				snapshot_mode;
> +	bool				snapshot_init_done;
> +	size_t				snapshot_size;
> +	size_t				snapshot_ref_buf_size;
> +	int				snapshot_ref_cnt;
> +	struct intel_pt_snapshot_ref	*snapshot_refs;
> +};
> +
> +static int intel_pt_parse_terms_with_default(struct list_head *formats,
> +					     const char *str,
> +					     u64 *config)
> +{
> +	struct list_head *terms;
> +	struct perf_event_attr attr = { .size = 0, };
> +	int err;
> +
> +	terms = malloc(sizeof(struct list_head));
> +	if (!terms)
> +		return -ENOMEM;
> +
> +	INIT_LIST_HEAD(terms);
> +
> +	err = parse_events_terms(terms, str);
> +	if (err)
> +		goto out_free;
> +
> +	attr.config = *config;
> +	err = perf_pmu__config_terms(formats, &attr, terms, true, NULL);
> +	if (err)
> +		goto out_free;
> +
> +	*config = attr.config;
> +out_free:
> +	parse_events__free_terms(terms);
> +	return err;
> +}
> +
> +static int intel_pt_parse_terms(struct list_head *formats, const char *str,
> +				u64 *config)
> +{
> +	*config = 0;
> +	return intel_pt_parse_terms_with_default(formats, str, config);
> +}
> +
> +static size_t intel_pt_psb_period(struct perf_pmu *intel_pt_pmu __maybe_unused,
> +				  struct perf_evlist *evlist __maybe_unused)
> +{
> +	return 256;
> +}
> +
> +static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
> +{
> +	u64 config;
> +
> +	intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &config);
> +	return config;
> +}
> +
> +static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr,
> +					   struct record_opts *opts,
> +					   const char *str)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	unsigned long long snapshot_size = 0;
> +	char *endptr;
> +
> +	if (str) {
> +		snapshot_size = strtoull(str, &endptr, 0);
> +		if (*endptr || snapshot_size > SIZE_MAX)
> +			return -1;
> +	}
> +
> +	opts->auxtrace_snapshot_mode = true;
> +	opts->auxtrace_snapshot_size = snapshot_size;
> +
> +	ptr->snapshot_size = snapshot_size;
> +
> +	return 0;
> +}
> +
> +struct perf_event_attr *
> +intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
> +{
> +	struct perf_event_attr *attr;
> +
> +	attr = zalloc(sizeof(struct perf_event_attr));
> +	if (!attr)
> +		return NULL;
> +
> +	attr->config = intel_pt_default_config(intel_pt_pmu);
> +
> +	intel_pt_pmu->selectable = true;
> +
> +	return attr;
> +}
> +
> +static size_t intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused)
> +{
> +	return INTEL_PT_AUXTRACE_PRIV_SIZE;
> +}
> +
> +static int intel_pt_info_fill(struct auxtrace_record *itr,
> +			      struct perf_session *session,
> +			      struct auxtrace_info_event *auxtrace_info,
> +			      size_t priv_size)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
> +	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;
> +	int err;
> +
> +	if (priv_size != INTEL_PT_AUXTRACE_PRIV_SIZE)
> +		return -EINVAL;
> +
> +	intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
> +	intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
> +			     &noretcomp_bit);
> +
> +	if (!session->evlist->nr_mmaps)
> +		return -EINVAL;
> +
> +	pc = session->evlist->mmap[0].base;
> +	if (pc) {
> +		err = perf_read_tsc_conversion(pc, &tc);
> +		if (err) {
> +			if (err != -EOPNOTSUPP)
> +				return err;
> +		} else {
> +			cap_user_time_zero = tc.time_mult != 0;
> +		}
> +		if (!cap_user_time_zero)
> +			ui__warning("Intel Processor Trace: TSC not available\n");
> +	}
> +
> +	per_cpu_mmaps = !cpu_map__empty(session->evlist->cpus);
> +
> +	auxtrace_info->type = PERF_AUXTRACE_INTEL_PT;
> +	auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type;
> +	auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift;
> +	auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult;
> +	auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero;
> +	auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero;
> +	auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit;
> +	auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit;
> +	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;
> +
> +	return 0;
> +}
> +
> +static int intel_pt_track_switches(struct perf_evlist *evlist)
> +{
> +	const char *sched_switch = "sched:sched_switch";
> +	struct perf_evsel *evsel;
> +	int err;
> +
> +	if (!perf_evlist__can_select_event(evlist, sched_switch))
> +		return -EPERM;
> +
> +	err = parse_events(evlist, sched_switch, NULL);
> +	if (err) {
> +		pr_debug2("%s: failed to parse %s, error %d\n",
> +			  __func__, sched_switch, err);
> +		return err;
> +	}
> +
> +	evsel = perf_evlist__last(evlist);
> +
> +	perf_evsel__set_sample_bit(evsel, CPU);
> +	perf_evsel__set_sample_bit(evsel, TIME);
> +
> +	evsel->system_wide = true;
> +	evsel->no_aux_samples = true;
> +	evsel->immediate = true;
> +
> +	return 0;
> +}
> +
> +static int intel_pt_recording_options(struct auxtrace_record *itr,
> +				      struct perf_evlist *evlist,
> +				      struct record_opts *opts)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
> +	bool have_timing_info;
> +	struct perf_evsel *evsel, *intel_pt_evsel = NULL;
> +	const struct cpu_map *cpus = evlist->cpus;
> +	bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
> +	u64 tsc_bit;
> +
> +	ptr->evlist = evlist;
> +	ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
> +
> +	evlist__for_each(evlist, evsel) {
> +		if (evsel->attr.type == intel_pt_pmu->type) {
> +			if (intel_pt_evsel) {
> +				pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n");
> +				return -EINVAL;
> +			}
> +			evsel->attr.freq = 0;
> +			evsel->attr.sample_period = 1;
> +			intel_pt_evsel = evsel;
> +			opts->full_auxtrace = true;
> +		}
> +	}
> +
> +	if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
> +		pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n");
> +		return -EINVAL;
> +	}
> +
> +	if (opts->use_clockid) {
> +		pr_err("Cannot use clockid (-k option) with " INTEL_PT_PMU_NAME "\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!opts->full_auxtrace)
> +		return 0;
> +
> +	/* Set default sizes for snapshot mode */
> +	if (opts->auxtrace_snapshot_mode) {
> +		size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
> +
> +		if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
> +			if (privileged) {
> +				opts->auxtrace_mmap_pages = MiB(4) / page_size;
> +			} else {
> +				opts->auxtrace_mmap_pages = KiB(128) / page_size;
> +				if (opts->mmap_pages == UINT_MAX)
> +					opts->mmap_pages = KiB(256) / page_size;
> +			}
> +		} else if (!opts->auxtrace_mmap_pages && !privileged &&
> +			   opts->mmap_pages == UINT_MAX) {
> +			opts->mmap_pages = KiB(256) / page_size;
> +		}
> +		if (!opts->auxtrace_snapshot_size)
> +			opts->auxtrace_snapshot_size =
> +				opts->auxtrace_mmap_pages * (size_t)page_size;
> +		if (!opts->auxtrace_mmap_pages) {
> +			size_t sz = opts->auxtrace_snapshot_size;
> +
> +			sz = round_up(sz, page_size) / page_size;
> +			opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
> +		}
> +		if (opts->auxtrace_snapshot_size >
> +				opts->auxtrace_mmap_pages * (size_t)page_size) {
> +			pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
> +			       opts->auxtrace_snapshot_size,
> +			       opts->auxtrace_mmap_pages * (size_t)page_size);
> +			return -EINVAL;
> +		}
> +		if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
> +			pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
> +			return -EINVAL;
> +		}
> +		pr_debug2("Intel PT snapshot size: %zu\n",
> +			  opts->auxtrace_snapshot_size);
> +		if (psb_period &&
> +		    opts->auxtrace_snapshot_size <= psb_period +
> +						  INTEL_PT_PSB_PERIOD_NEAR)
> +			ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n",
> +				    opts->auxtrace_snapshot_size, psb_period);
> +	}
> +
> +	/* Set default sizes for full trace mode */
> +	if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
> +		if (privileged) {
> +			opts->auxtrace_mmap_pages = MiB(4) / page_size;
> +		} else {
> +			opts->auxtrace_mmap_pages = KiB(128) / page_size;
> +			if (opts->mmap_pages == UINT_MAX)
> +				opts->mmap_pages = KiB(256) / page_size;
> +		}
> +	}
> +
> +	/* Validate auxtrace_mmap_pages */
> +	if (opts->auxtrace_mmap_pages) {
> +		size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
> +		size_t min_sz;
> +
> +		if (opts->auxtrace_snapshot_mode)
> +			min_sz = KiB(4);
> +		else
> +			min_sz = KiB(8);
> +
> +		if (sz < min_sz || !is_power_of_2(sz)) {
> +			pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n",
> +			       min_sz / 1024);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
> +
> +	if (opts->full_auxtrace && (intel_pt_evsel->attr.config & tsc_bit))
> +		have_timing_info = true;
> +	else
> +		have_timing_info = false;
> +
> +	/*
> +	 * Per-cpu recording needs sched_switch events to distinguish different
> +	 * threads.
> +	 */
> +	if (have_timing_info && !cpu_map__empty(cpus)) {
> +		int err;
> +
> +		err = intel_pt_track_switches(evlist);
> +		if (err == -EPERM)
> +			pr_debug2("Unable to select sched:sched_switch\n");
> +		else if (err)
> +			return err;
> +		else
> +			ptr->have_sched_switch = 1;
> +	}
> +
> +	if (intel_pt_evsel) {
> +		/*
> +		 * To obtain the auxtrace buffer file descriptor, the auxtrace
> +		 * event must come first.
> +		 */
> +		perf_evlist__to_front(evlist, intel_pt_evsel);
> +		/*
> +		 * In the case of per-cpu mmaps, we need the CPU on the
> +		 * AUX event.
> +		 */
> +		if (!cpu_map__empty(cpus))
> +			perf_evsel__set_sample_bit(intel_pt_evsel, CPU);
> +	}
> +
> +	/* Add dummy event to keep tracking */
> +	if (opts->full_auxtrace) {
> +		struct perf_evsel *tracking_evsel;
> +		int err;
> +
> +		err = parse_events(evlist, "dummy:u", NULL);
> +		if (err)
> +			return err;
> +
> +		tracking_evsel = perf_evlist__last(evlist);
> +
> +		perf_evlist__set_tracking_event(evlist, tracking_evsel);
> +
> +		tracking_evsel->attr.freq = 0;
> +		tracking_evsel->attr.sample_period = 1;
> +
> +		/* In per-cpu case, always need the time of mmap events etc */
> +		if (!cpu_map__empty(cpus))
> +			perf_evsel__set_sample_bit(tracking_evsel, TIME);
> +	}
> +
> +	/*
> +	 * Warn the user when we do not have enough information to decode i.e.
> +	 * per-cpu with no sched_switch (except workload-only).
> +	 */
> +	if (!ptr->have_sched_switch && !cpu_map__empty(cpus) &&
> +	    !target__none(&opts->target))
> +		ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n");
> +
> +	return 0;
> +}
> +
> +static int intel_pt_snapshot_start(struct auxtrace_record *itr)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each(ptr->evlist, evsel) {
> +		if (evsel->attr.type == ptr->intel_pt_pmu->type)
> +			return perf_evlist__disable_event(ptr->evlist, evsel);
> +	}
> +	return -EINVAL;
> +}
> +
> +static int intel_pt_snapshot_finish(struct auxtrace_record *itr)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each(ptr->evlist, evsel) {
> +		if (evsel->attr.type == ptr->intel_pt_pmu->type)
> +			return perf_evlist__enable_event(ptr->evlist, evsel);
> +	}
> +	return -EINVAL;
> +}
> +
> +static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx)
> +{
> +	const size_t sz = sizeof(struct intel_pt_snapshot_ref);
> +	int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2;
> +	struct intel_pt_snapshot_ref *refs;
> +
> +	if (!new_cnt)
> +		new_cnt = 16;
> +
> +	while (new_cnt <= idx)
> +		new_cnt *= 2;
> +
> +	refs = calloc(new_cnt, sz);
> +	if (!refs)
> +		return -ENOMEM;
> +
> +	memcpy(refs, ptr->snapshot_refs, cnt * sz);
> +
> +	ptr->snapshot_refs = refs;
> +	ptr->snapshot_ref_cnt = new_cnt;
> +
> +	return 0;
> +}
> +
> +static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr)
> +{
> +	int i;
> +
> +	for (i = 0; i < ptr->snapshot_ref_cnt; i++)
> +		zfree(&ptr->snapshot_refs[i].ref_buf);
> +	zfree(&ptr->snapshot_refs);
> +}
> +
> +static void intel_pt_recording_free(struct auxtrace_record *itr)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +
> +	intel_pt_free_snapshot_refs(ptr);
> +	free(ptr);
> +}
> +
> +static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx,
> +				       size_t snapshot_buf_size)
> +{
> +	size_t ref_buf_size = ptr->snapshot_ref_buf_size;
> +	void *ref_buf;
> +
> +	ref_buf = zalloc(ref_buf_size);
> +	if (!ref_buf)
> +		return -ENOMEM;
> +
> +	ptr->snapshot_refs[idx].ref_buf = ref_buf;
> +	ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size;
> +
> +	return 0;
> +}
> +
> +static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr,
> +					     size_t snapshot_buf_size)
> +{
> +	const size_t max_size = 256 * 1024;
> +	size_t buf_size = 0, psb_period;
> +
> +	if (ptr->snapshot_size <= 64 * 1024)
> +		return 0;
> +
> +	psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist);
> +	if (psb_period)
> +		buf_size = psb_period * 2;
> +
> +	if (!buf_size || buf_size > max_size)
> +		buf_size = max_size;
> +
> +	if (buf_size >= snapshot_buf_size)
> +		return 0;
> +
> +	if (buf_size >= ptr->snapshot_size / 2)
> +		return 0;
> +
> +	return buf_size;
> +}
> +
> +static int intel_pt_snapshot_init(struct intel_pt_recording *ptr,
> +				  size_t snapshot_buf_size)
> +{
> +	if (ptr->snapshot_init_done)
> +		return 0;
> +
> +	ptr->snapshot_init_done = true;
> +
> +	ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr,
> +							snapshot_buf_size);
> +
> +	return 0;
> +}
> +
> +/**
> + * intel_pt_compare_buffers - compare bytes in a buffer to a circular buffer.
> + * @buf1: first buffer
> + * @compare_size: number of bytes to compare
> + * @buf2: second buffer (a circular buffer)
> + * @offs2: offset in second buffer
> + * @buf2_size: size of second buffer
> + *
> + * The comparison allows for the possibility that the bytes to compare in the
> + * circular buffer are not contiguous.  It is assumed that @compare_size <=
> + * @buf2_size.  This function returns %false if the bytes are identical, %true
> + * otherwise.
> + */
> +static bool intel_pt_compare_buffers(void *buf1, size_t compare_size,
> +				     void *buf2, size_t offs2, size_t buf2_size)
> +{
> +	size_t end2 = offs2 + compare_size, part_size;
> +
> +	if (end2 <= buf2_size)
> +		return memcmp(buf1, buf2 + offs2, compare_size);
> +
> +	part_size = end2 - buf2_size;
> +	if (memcmp(buf1, buf2 + offs2, part_size))
> +		return true;
> +
> +	compare_size -= part_size;
> +
> +	return memcmp(buf1 + part_size, buf2, compare_size);
> +}
> +
> +static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset,
> +				 size_t ref_size, size_t buf_size,
> +				 void *data, size_t head)
> +{
> +	size_t ref_end = ref_offset + ref_size;
> +
> +	if (ref_end > buf_size) {
> +		if (head > ref_offset || head < ref_end - buf_size)
> +			return true;
> +	} else if (head > ref_offset && head < ref_end) {
> +		return true;
> +	}
> +
> +	return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset,
> +					buf_size);
> +}
> +
> +static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size,
> +			      void *data, size_t head)
> +{
> +	if (head >= ref_size) {
> +		memcpy(ref_buf, data + head - ref_size, ref_size);
> +	} else {
> +		memcpy(ref_buf, data, head);
> +		ref_size -= head;
> +		memcpy(ref_buf + head, data + buf_size - ref_size, ref_size);
> +	}
> +}
> +
> +static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx,
> +			     struct auxtrace_mmap *mm, unsigned char *data,
> +			     u64 head)
> +{
> +	struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx];
> +	bool wrapped;
> +
> +	wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset,
> +				       ptr->snapshot_ref_buf_size, mm->len,
> +				       data, head);
> +
> +	intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len,
> +			  data, head);
> +
> +	return wrapped;
> +}
> +
> +static bool intel_pt_first_wrap(u64 *data, size_t buf_size)
> +{
> +	int i, a, b;
> +
> +	b = buf_size >> 3;
> +	a = b - 512;
> +	if (a < 0)
> +		a = 0;
> +
> +	for (i = a; i < b; i++) {
> +		if (data[i])
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx,
> +				  struct auxtrace_mmap *mm, unsigned char *data,
> +				  u64 *head, u64 *old)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	bool wrapped;
> +	int err;
> +
> +	pr_debug3("%s: mmap index %d old head %zu new head %zu\n",
> +		  __func__, idx, (size_t)*old, (size_t)*head);
> +
> +	err = intel_pt_snapshot_init(ptr, mm->len);
> +	if (err)
> +		goto out_err;
> +
> +	if (idx >= ptr->snapshot_ref_cnt) {
> +		err = intel_pt_alloc_snapshot_refs(ptr, idx);
> +		if (err)
> +			goto out_err;
> +	}
> +
> +	if (ptr->snapshot_ref_buf_size) {
> +		if (!ptr->snapshot_refs[idx].ref_buf) {
> +			err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len);
> +			if (err)
> +				goto out_err;
> +		}
> +		wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head);
> +	} else {
> +		wrapped = ptr->snapshot_refs[idx].wrapped;
> +		if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) {
> +			ptr->snapshot_refs[idx].wrapped = true;
> +			wrapped = true;
> +		}
> +	}
> +
> +	/*
> +	 * In full trace mode 'head' continually increases.  However in snapshot
> +	 * mode 'head' is an offset within the buffer.  Here 'old' and 'head'
> +	 * are adjusted to match the full trace case which expects that 'old' is
> +	 * always less than 'head'.
> +	 */
> +	if (wrapped) {
> +		*old = *head;
> +		*head += mm->len;
> +	} else {
> +		if (mm->mask)
> +			*old &= mm->mask;
> +		else
> +			*old %= mm->len;
> +		if (*old > *head)
> +			*head += mm->len;
> +	}
> +
> +	pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n",
> +		  __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head);
> +
> +	return 0;
> +
> +out_err:
> +	pr_err("%s: failed, error %d\n", __func__, err);
> +	return err;
> +}
> +
> +static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused)
> +{
> +	return rdtsc();
> +}
> +
> +static int intel_pt_read_finish(struct auxtrace_record *itr, int idx)
> +{
> +	struct intel_pt_recording *ptr =
> +			container_of(itr, struct intel_pt_recording, itr);
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each(ptr->evlist, evsel) {
> +		if (evsel->attr.type == ptr->intel_pt_pmu->type)
> +			return perf_evlist__enable_event_idx(ptr->evlist, evsel,
> +							     idx);
> +	}
> +	return -EINVAL;
> +}
> +
> +struct auxtrace_record *intel_pt_recording_init(int *err)
> +{
> +	struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
> +	struct intel_pt_recording *ptr;
> +
> +	if (!intel_pt_pmu)
> +		return NULL;
> +
> +	ptr = zalloc(sizeof(struct intel_pt_recording));
> +	if (!ptr) {
> +		*err = -ENOMEM;
> +		return NULL;
> +	}
> +
> +	ptr->intel_pt_pmu = intel_pt_pmu;
> +	ptr->itr.recording_options = intel_pt_recording_options;
> +	ptr->itr.info_priv_size = intel_pt_info_priv_size;
> +	ptr->itr.info_fill = intel_pt_info_fill;
> +	ptr->itr.free = intel_pt_recording_free;
> +	ptr->itr.snapshot_start = intel_pt_snapshot_start;
> +	ptr->itr.snapshot_finish = intel_pt_snapshot_finish;
> +	ptr->itr.find_snapshot = intel_pt_find_snapshot;
> +	ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options;
> +	ptr->itr.reference = intel_pt_reference;
> +	ptr->itr.read_finish = intel_pt_read_finish;
> +	return &ptr->itr;
> +}
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 86c81f6..ec7ab9d 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -76,6 +76,7 @@ libperf-y += cloexec.o
>  libperf-y += thread-stack.o
>  libperf-$(CONFIG_AUXTRACE) += auxtrace.o
>  libperf-$(CONFIG_AUXTRACE) += intel-pt-decoder/
> +libperf-$(CONFIG_AUXTRACE) += intel-pt.o
>  libperf-y += parse-branch-options.o
>  
>  libperf-$(CONFIG_LIBELF) += symbol-elf.o
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> new file mode 100644
> index 0000000..6d66879
> --- /dev/null
> +++ b/tools/perf/util/intel-pt.c
> @@ -0,0 +1,1889 @@
> +/*
> + * intel_pt.c: Intel Processor Trace support
> + * Copyright (c) 2013-2015, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <stdio.h>
> +#include <stdbool.h>
> +#include <errno.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +
> +#include "../perf.h"
> +#include "session.h"
> +#include "machine.h"
> +#include "tool.h"
> +#include "event.h"
> +#include "evlist.h"
> +#include "evsel.h"
> +#include "map.h"
> +#include "color.h"
> +#include "util.h"
> +#include "thread.h"
> +#include "thread-stack.h"
> +#include "symbol.h"
> +#include "callchain.h"
> +#include "dso.h"
> +#include "debug.h"
> +#include "auxtrace.h"
> +#include "tsc.h"
> +#include "intel-pt.h"
> +
> +#include "intel-pt-decoder/intel-pt-log.h"
> +#include "intel-pt-decoder/intel-pt-decoder.h"
> +#include "intel-pt-decoder/intel-pt-insn-decoder.h"
> +#include "intel-pt-decoder/intel-pt-pkt-decoder.h"
> +
> +#define MAX_TIMESTAMP (~0ULL)
> +
> +struct intel_pt {
> +	struct auxtrace auxtrace;
> +	struct auxtrace_queues queues;
> +	struct auxtrace_heap heap;
> +	u32 auxtrace_type;
> +	struct perf_session *session;
> +	struct machine *machine;
> +	struct perf_evsel *switch_evsel;
> +	struct thread *unknown_thread;
> +	bool timeless_decoding;
> +	bool sampling_mode;
> +	bool snapshot_mode;
> +	bool per_cpu_mmaps;
> +	bool have_tsc;
> +	bool data_queued;
> +	bool est_tsc;
> +	bool sync_switch;
> +	bool est_tsc_orig;
> +	int have_sched_switch;
> +	u32 pmu_type;
> +	u64 kernel_start;
> +	u64 switch_ip;
> +	u64 ptss_ip;
> +
> +	struct perf_tsc_conversion tc;
> +	bool cap_user_time_zero;
> +
> +	struct itrace_synth_opts synth_opts;
> +
> +	bool sample_instructions;
> +	u64 instructions_sample_type;
> +	u64 instructions_sample_period;
> +	u64 instructions_id;
> +
> +	bool sample_branches;
> +	u32 branches_filter;
> +	u64 branches_sample_type;
> +	u64 branches_id;
> +
> +	bool sample_transactions;
> +	u64 transactions_sample_type;
> +	u64 transactions_id;
> +
> +	bool synth_needs_swap;
> +
> +	u64 tsc_bit;
> +	u64 noretcomp_bit;
> +};
> +
> +enum switch_state {
> +	INTEL_PT_SS_NOT_TRACING,
> +	INTEL_PT_SS_UNKNOWN,
> +	INTEL_PT_SS_TRACING,
> +	INTEL_PT_SS_EXPECTING_SWITCH_EVENT,
> +	INTEL_PT_SS_EXPECTING_SWITCH_IP,
> +};
> +
> +struct intel_pt_queue {
> +	struct intel_pt *pt;
> +	unsigned int queue_nr;
> +	struct auxtrace_buffer *buffer;
> +	void *decoder;
> +	const struct intel_pt_state *state;
> +	struct ip_callchain *chain;
> +	union perf_event *event_buf;
> +	bool on_heap;
> +	bool stop;
> +	bool step_through_buffers;
> +	bool use_buffer_pid_tid;
> +	pid_t pid, tid;
> +	int cpu;
> +	int switch_state;
> +	pid_t next_tid;
> +	struct thread *thread;
> +	bool exclude_kernel;
> +	bool have_sample;
> +	u64 time;
> +	u64 timestamp;
> +	u32 flags;
> +	u16 insn_len;
> +};
> +
> +static void intel_pt_dump(struct intel_pt *pt __maybe_unused,
> +			  unsigned char *buf, size_t len)
> +{
> +	struct intel_pt_pkt packet;
> +	size_t pos = 0;
> +	int ret, pkt_len, i;
> +	char desc[INTEL_PT_PKT_DESC_MAX];
> +	const char *color = PERF_COLOR_BLUE;
> +
> +	color_fprintf(stdout, color,
> +		      ". ... Intel Processor Trace data: size %zu bytes\n",
> +		      len);
> +
> +	while (len) {
> +		ret = intel_pt_get_packet(buf, len, &packet);
> +		if (ret > 0)
> +			pkt_len = ret;
> +		else
> +			pkt_len = 1;
> +		printf(".");
> +		color_fprintf(stdout, color, "  %08x: ", pos);
> +		for (i = 0; i < pkt_len; i++)
> +			color_fprintf(stdout, color, " %02x", buf[i]);
> +		for (; i < 16; i++)
> +			color_fprintf(stdout, color, "   ");
> +		if (ret > 0) {
> +			ret = intel_pt_pkt_desc(&packet, desc,
> +						INTEL_PT_PKT_DESC_MAX);
> +			if (ret > 0)
> +				color_fprintf(stdout, color, " %s\n", desc);
> +		} else {
> +			color_fprintf(stdout, color, " Bad packet!\n");
> +		}
> +		pos += pkt_len;
> +		buf += pkt_len;
> +		len -= pkt_len;
> +	}
> +}
> +
> +static void intel_pt_dump_event(struct intel_pt *pt, unsigned char *buf,
> +				size_t len)
> +{
> +	printf(".\n");
> +	intel_pt_dump(pt, buf, len);
> +}
> +
> +static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer *a,
> +				   struct auxtrace_buffer *b)
> +{
> +	void *start;
> +
> +	start = intel_pt_find_overlap(a->data, a->size, b->data, b->size,
> +				      pt->have_tsc);
> +	if (!start)
> +		return -EINVAL;
> +	b->use_size = b->data + b->size - start;
> +	b->use_data = start;
> +	return 0;
> +}
> +
> +static void intel_pt_use_buffer_pid_tid(struct intel_pt_queue *ptq,
> +					struct auxtrace_queue *queue,
> +					struct auxtrace_buffer *buffer)
> +{
> +	if (queue->cpu == -1 && buffer->cpu != -1)
> +		ptq->cpu = buffer->cpu;
> +
> +	ptq->pid = buffer->pid;
> +	ptq->tid = buffer->tid;
> +
> +	intel_pt_log("queue %u cpu %d pid %d tid %d\n",
> +		     ptq->queue_nr, ptq->cpu, ptq->pid, ptq->tid);
> +
> +	ptq->thread = NULL;
> +
> +	if (ptq->tid != -1) {
> +		if (ptq->pid != -1)
> +			ptq->thread = machine__findnew_thread(ptq->pt->machine,
> +							      ptq->pid,
> +							      ptq->tid);
> +		else
> +			ptq->thread = machine__find_thread(ptq->pt->machine, -1,
> +							   ptq->tid);
> +	}
> +}
> +
> +/* This function assumes data is processed sequentially only */
> +static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
> +{
> +	struct intel_pt_queue *ptq = data;
> +	struct auxtrace_buffer *buffer = ptq->buffer, *old_buffer = buffer;
> +	struct auxtrace_queue *queue;
> +
> +	if (ptq->stop) {
> +		b->len = 0;
> +		return 0;
> +	}
> +
> +	queue = &ptq->pt->queues.queue_array[ptq->queue_nr];
> +
> +	buffer = auxtrace_buffer__next(queue, buffer);
> +	if (!buffer) {
> +		if (old_buffer)
> +			auxtrace_buffer__drop_data(old_buffer);
> +		b->len = 0;
> +		return 0;
> +	}
> +
> +	ptq->buffer = buffer;
> +
> +	if (!buffer->data) {
> +		int fd = perf_data_file__fd(ptq->pt->session->file);
> +
> +		buffer->data = auxtrace_buffer__get_data(buffer, fd);
> +		if (!buffer->data)
> +			return -ENOMEM;
> +	}
> +
> +	if (ptq->pt->snapshot_mode && !buffer->consecutive && old_buffer &&
> +	    intel_pt_do_fix_overlap(ptq->pt, old_buffer, buffer))
> +		return -ENOMEM;
> +
> +	if (old_buffer)
> +		auxtrace_buffer__drop_data(old_buffer);
> +
> +	if (buffer->use_data) {
> +		b->len = buffer->use_size;
> +		b->buf = buffer->use_data;
> +	} else {
> +		b->len = buffer->size;
> +		b->buf = buffer->data;
> +	}
> +	b->ref_timestamp = buffer->reference;
> +
> +	if (!old_buffer || ptq->pt->sampling_mode || (ptq->pt->snapshot_mode &&
> +						      !buffer->consecutive)) {
> +		b->consecutive = false;
> +		b->trace_nr = buffer->buffer_nr;
> +	} else {
> +		b->consecutive = true;
> +	}
> +
> +	if (ptq->use_buffer_pid_tid && (ptq->pid != buffer->pid ||
> +					ptq->tid != buffer->tid))
> +		intel_pt_use_buffer_pid_tid(ptq, queue, buffer);
> +
> +	if (ptq->step_through_buffers)
> +		ptq->stop = true;
> +
> +	if (!b->len)
> +		return intel_pt_get_trace(b, data);
> +
> +	return 0;
> +}
> +
> +struct intel_pt_cache_entry {
> +	struct auxtrace_cache_entry	entry;
> +	u64				insn_cnt;
> +	u64				byte_cnt;
> +	enum intel_pt_insn_op		op;
> +	enum intel_pt_insn_branch	branch;
> +	int				length;
> +	int32_t				rel;
> +};
> +
> +static int intel_pt_config_div(const char *var, const char *value, void *data)
> +{
> +	int *d = data;
> +	long val;
> +
> +	if (!strcmp(var, "intel-pt.cache-divisor")) {
> +		val = strtol(value, NULL, 0);
> +		if (val > 0 && val <= INT_MAX)
> +			*d = val;
> +	}
> +
> +	return 0;
> +}
> +
> +static int intel_pt_cache_divisor(void)
> +{
> +	static int d;
> +
> +	if (d)
> +		return d;
> +
> +	perf_config(intel_pt_config_div, &d);
> +
> +	if (!d)
> +		d = 64;
> +
> +	return d;
> +}
> +
> +static unsigned int intel_pt_cache_size(struct dso *dso,
> +					struct machine *machine)
> +{
> +	off_t size;
> +
> +	size = dso__data_size(dso, machine);
> +	size /= intel_pt_cache_divisor();
> +	if (size < 1000)
> +		return 10;
> +	if (size > (1 << 21))
> +		return 21;
> +	return 32 - __builtin_clz(size);
> +}
> +
> +static struct auxtrace_cache *intel_pt_cache(struct dso *dso,
> +					     struct machine *machine)
> +{
> +	struct auxtrace_cache *c;
> +	unsigned int bits;
> +
> +	if (dso->auxtrace_cache)
> +		return dso->auxtrace_cache;
> +
> +	bits = intel_pt_cache_size(dso, machine);
> +
> +	/* Ignoring cache creation failure */
> +	c = auxtrace_cache__new(bits, sizeof(struct intel_pt_cache_entry), 200);
> +
> +	dso->auxtrace_cache = c;
> +
> +	return c;
> +}
> +
> +static int intel_pt_cache_add(struct dso *dso, struct machine *machine,
> +			      u64 offset, u64 insn_cnt, u64 byte_cnt,
> +			      struct intel_pt_insn *intel_pt_insn)
> +{
> +	struct auxtrace_cache *c = intel_pt_cache(dso, machine);
> +	struct intel_pt_cache_entry *e;
> +	int err;
> +
> +	if (!c)
> +		return -ENOMEM;
> +
> +	e = auxtrace_cache__alloc_entry(c);
> +	if (!e)
> +		return -ENOMEM;
> +
> +	e->insn_cnt = insn_cnt;
> +	e->byte_cnt = byte_cnt;
> +	e->op = intel_pt_insn->op;
> +	e->branch = intel_pt_insn->branch;
> +	e->length = intel_pt_insn->length;
> +	e->rel = intel_pt_insn->rel;
> +
> +	err = auxtrace_cache__add(c, offset, &e->entry);
> +	if (err)
> +		auxtrace_cache__free_entry(c, e);
> +
> +	return err;
> +}
> +
> +static struct intel_pt_cache_entry *
> +intel_pt_cache_lookup(struct dso *dso, struct machine *machine, u64 offset)
> +{
> +	struct auxtrace_cache *c = intel_pt_cache(dso, machine);
> +
> +	if (!c)
> +		return NULL;
> +
> +	return auxtrace_cache__lookup(dso->auxtrace_cache, offset);
> +}
> +
> +static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
> +				   uint64_t *insn_cnt_ptr, uint64_t *ip,
> +				   uint64_t to_ip, uint64_t max_insn_cnt,
> +				   void *data)
> +{
> +	struct intel_pt_queue *ptq = data;
> +	struct machine *machine = ptq->pt->machine;
> +	struct thread *thread;
> +	struct addr_location al;
> +	unsigned char buf[1024];
> +	size_t bufsz;
> +	ssize_t len;
> +	int x86_64;
> +	u8 cpumode;
> +	u64 offset, start_offset, start_ip;
> +	u64 insn_cnt = 0;
> +	bool one_map = true;
> +
> +	if (to_ip && *ip == to_ip)
> +		goto out_no_cache;
> +
> +	bufsz = intel_pt_insn_max_size();
> +
> +	if (*ip >= ptq->pt->kernel_start)
> +		cpumode = PERF_RECORD_MISC_KERNEL;
> +	else
> +		cpumode = PERF_RECORD_MISC_USER;
> +
> +	thread = ptq->thread;
> +	if (!thread) {
> +		if (cpumode != PERF_RECORD_MISC_KERNEL)
> +			return -EINVAL;
> +		thread = ptq->pt->unknown_thread;
> +	}
> +
> +	while (1) {
> +		thread__find_addr_map(thread, cpumode, MAP__FUNCTION, *ip, &al);
> +		if (!al.map || !al.map->dso)
> +			return -EINVAL;
> +
> +		if (al.map->dso->data.status == DSO_DATA_STATUS_ERROR &&
> +		    dso__data_status_seen(al.map->dso,
> +					  DSO_DATA_STATUS_SEEN_ITRACE))
> +			return -ENOENT;
> +
> +		offset = al.map->map_ip(al.map, *ip);
> +
> +		if (!to_ip && one_map) {
> +			struct intel_pt_cache_entry *e;
> +
> +			e = intel_pt_cache_lookup(al.map->dso, machine, offset);
> +			if (e &&
> +			    (!max_insn_cnt || e->insn_cnt <= max_insn_cnt)) {
> +				*insn_cnt_ptr = e->insn_cnt;
> +				*ip += e->byte_cnt;
> +				intel_pt_insn->op = e->op;
> +				intel_pt_insn->branch = e->branch;
> +				intel_pt_insn->length = e->length;
> +				intel_pt_insn->rel = e->rel;
> +				intel_pt_log_insn_no_data(intel_pt_insn, *ip);
> +				return 0;
> +			}
> +		}
> +
> +		start_offset = offset;
> +		start_ip = *ip;
> +
> +		/* Load maps to ensure dso->is_64_bit has been updated */
> +		map__load(al.map, machine->symbol_filter);
> +
> +		x86_64 = al.map->dso->is_64_bit;
> +
> +		while (1) {
> +			len = dso__data_read_offset(al.map->dso, machine,
> +						    offset, buf, bufsz);
> +			if (len <= 0)
> +				return -EINVAL;
> +
> +			if (intel_pt_get_insn(buf, len, x86_64, intel_pt_insn))
> +				return -EINVAL;
> +
> +			intel_pt_log_insn(intel_pt_insn, *ip);
> +
> +			insn_cnt += 1;
> +
> +			if (intel_pt_insn->branch != INTEL_PT_BR_NO_BRANCH)
> +				goto out;
> +
> +			if (max_insn_cnt && insn_cnt >= max_insn_cnt)
> +				goto out_no_cache;
> +
> +			*ip += intel_pt_insn->length;
> +
> +			if (to_ip && *ip == to_ip)
> +				goto out_no_cache;
> +
> +			if (*ip >= al.map->end)
> +				break;
> +
> +			offset += intel_pt_insn->length;
> +		}
> +		one_map = false;
> +	}
> +out:
> +	*insn_cnt_ptr = insn_cnt;
> +
> +	if (!one_map)
> +		goto out_no_cache;
> +
> +	/*
> +	 * Didn't lookup in the 'to_ip' case, so do it now to prevent duplicate
> +	 * entries.
> +	 */
> +	if (to_ip) {
> +		struct intel_pt_cache_entry *e;
> +
> +		e = intel_pt_cache_lookup(al.map->dso, machine, start_offset);
> +		if (e)
> +			return 0;
> +	}
> +
> +	/* Ignore cache errors */
> +	intel_pt_cache_add(al.map->dso, machine, start_offset, insn_cnt,
> +			   *ip - start_ip, intel_pt_insn);
> +
> +	return 0;
> +
> +out_no_cache:
> +	*insn_cnt_ptr = insn_cnt;
> +	return 0;
> +}
> +
> +static bool intel_pt_get_config(struct intel_pt *pt,
> +				struct perf_event_attr *attr, u64 *config)
> +{
> +	if (attr->type == pt->pmu_type) {
> +		if (config)
> +			*config = attr->config;
> +		return true;
> +	}
> +
> +	return false;
> +}
> +
> +static bool intel_pt_exclude_kernel(struct intel_pt *pt)
> +{
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each(pt->session->evlist, evsel) {
> +		if (intel_pt_get_config(pt, &evsel->attr, NULL) &&
> +		    !evsel->attr.exclude_kernel)
> +			return false;
> +	}
> +	return true;
> +}
> +
> +static bool intel_pt_return_compression(struct intel_pt *pt)
> +{
> +	struct perf_evsel *evsel;
> +	u64 config;
> +
> +	if (!pt->noretcomp_bit)
> +		return true;
> +
> +	evlist__for_each(pt->session->evlist, evsel) {
> +		if (intel_pt_get_config(pt, &evsel->attr, &config) &&
> +		    (config & pt->noretcomp_bit))
> +			return false;
> +	}
> +	return true;
> +}
> +
> +static bool intel_pt_timeless_decoding(struct intel_pt *pt)
> +{
> +	struct perf_evsel *evsel;
> +	bool timeless_decoding = true;
> +	u64 config;
> +
> +	if (!pt->tsc_bit || !pt->cap_user_time_zero)
> +		return true;
> +
> +	evlist__for_each(pt->session->evlist, evsel) {
> +		if (!(evsel->attr.sample_type & PERF_SAMPLE_TIME))
> +			return true;
> +		if (intel_pt_get_config(pt, &evsel->attr, &config)) {
> +			if (config & pt->tsc_bit)
> +				timeless_decoding = false;
> +			else
> +				return true;
> +		}
> +	}
> +	return timeless_decoding;
> +}
> +
> +static bool intel_pt_tracing_kernel(struct intel_pt *pt)
> +{
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each(pt->session->evlist, evsel) {
> +		if (intel_pt_get_config(pt, &evsel->attr, NULL) &&
> +		    !evsel->attr.exclude_kernel)
> +			return true;
> +	}
> +	return false;
> +}
> +
> +static bool intel_pt_have_tsc(struct intel_pt *pt)
> +{
> +	struct perf_evsel *evsel;
> +	bool have_tsc = false;
> +	u64 config;
> +
> +	if (!pt->tsc_bit)
> +		return false;
> +
> +	evlist__for_each(pt->session->evlist, evsel) {
> +		if (intel_pt_get_config(pt, &evsel->attr, &config)) {
> +			if (config & pt->tsc_bit)
> +				have_tsc = true;
> +			else
> +				return false;
> +		}
> +	}
> +	return have_tsc;
> +}
> +
> +static u64 intel_pt_ns_to_ticks(const struct intel_pt *pt, u64 ns)
> +{
> +	u64 quot, rem;
> +
> +	quot = ns / pt->tc.time_mult;
> +	rem  = ns % pt->tc.time_mult;
> +	return (quot << pt->tc.time_shift) + (rem << pt->tc.time_shift) /
> +		pt->tc.time_mult;
> +}
> +
> +static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
> +						   unsigned int queue_nr)
> +{
> +	struct intel_pt_params params = { .get_trace = 0, };
> +	struct intel_pt_queue *ptq;
> +
> +	ptq = zalloc(sizeof(struct intel_pt_queue));
> +	if (!ptq)
> +		return NULL;
> +
> +	if (pt->synth_opts.callchain) {
> +		size_t sz = sizeof(struct ip_callchain);
> +
> +		sz += pt->synth_opts.callchain_sz * sizeof(u64);
> +		ptq->chain = zalloc(sz);
> +		if (!ptq->chain)
> +			goto out_free;
> +	}
> +
> +	ptq->event_buf = malloc(PERF_SAMPLE_MAX_SIZE);
> +	if (!ptq->event_buf)
> +		goto out_free;
> +
> +	ptq->pt = pt;
> +	ptq->queue_nr = queue_nr;
> +	ptq->exclude_kernel = intel_pt_exclude_kernel(pt);
> +	ptq->pid = -1;
> +	ptq->tid = -1;
> +	ptq->cpu = -1;
> +	ptq->next_tid = -1;
> +
> +	params.get_trace = intel_pt_get_trace;
> +	params.walk_insn = intel_pt_walk_next_insn;
> +	params.data = ptq;
> +	params.return_compression = intel_pt_return_compression(pt);
> +
> +	if (pt->synth_opts.instructions) {
> +		if (pt->synth_opts.period) {
> +			switch (pt->synth_opts.period_type) {
> +			case PERF_ITRACE_PERIOD_INSTRUCTIONS:
> +				params.period_type =
> +						INTEL_PT_PERIOD_INSTRUCTIONS;
> +				params.period = pt->synth_opts.period;
> +				break;
> +			case PERF_ITRACE_PERIOD_TICKS:
> +				params.period_type = INTEL_PT_PERIOD_TICKS;
> +				params.period = pt->synth_opts.period;
> +				break;
> +			case PERF_ITRACE_PERIOD_NANOSECS:
> +				params.period_type = INTEL_PT_PERIOD_TICKS;
> +				params.period = intel_pt_ns_to_ticks(pt,
> +							pt->synth_opts.period);
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +
> +		if (!params.period) {
> +			params.period_type = INTEL_PT_PERIOD_INSTRUCTIONS;
> +			params.period = 1000;
> +		}
> +	}
> +
> +	ptq->decoder = intel_pt_decoder_new(&params);
> +	if (!ptq->decoder)
> +		goto out_free;
> +
> +	return ptq;
> +
> +out_free:
> +	zfree(&ptq->event_buf);
> +	zfree(&ptq->chain);
> +	free(ptq);
> +	return NULL;
> +}
> +
> +static void intel_pt_free_queue(void *priv)
> +{
> +	struct intel_pt_queue *ptq = priv;
> +
> +	if (!ptq)
> +		return;
> +	intel_pt_decoder_free(ptq->decoder);
> +	zfree(&ptq->event_buf);
> +	zfree(&ptq->chain);
> +	free(ptq);
> +}
> +
> +static void intel_pt_set_pid_tid_cpu(struct intel_pt *pt,
> +				     struct auxtrace_queue *queue)
> +{
> +	struct intel_pt_queue *ptq = queue->priv;
> +
> +	if (queue->tid == -1 || pt->have_sched_switch) {
> +		ptq->tid = machine__get_current_tid(pt->machine, ptq->cpu);
> +		ptq->thread = NULL;
> +	}
> +
> +	if (!ptq->thread && ptq->tid != -1)
> +		ptq->thread = machine__find_thread(pt->machine, -1, ptq->tid);
> +
> +	if (ptq->thread) {
> +		ptq->pid = ptq->thread->pid_;
> +		if (queue->cpu == -1)
> +			ptq->cpu = ptq->thread->cpu;
> +	}
> +}
> +
> +static void intel_pt_sample_flags(struct intel_pt_queue *ptq)
> +{
> +	if (ptq->state->flags & INTEL_PT_ABORT_TX) {
> +		ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TX_ABORT;
> +	} else if (ptq->state->flags & INTEL_PT_ASYNC) {
> +		if (ptq->state->to_ip)
> +			ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL |
> +				     PERF_IP_FLAG_ASYNC |
> +				     PERF_IP_FLAG_INTERRUPT;
> +		else
> +			ptq->flags = PERF_IP_FLAG_BRANCH |
> +				     PERF_IP_FLAG_TRACE_END;
> +		ptq->insn_len = 0;
> +	} else {
> +		if (ptq->state->from_ip)
> +			ptq->flags = intel_pt_insn_type(ptq->state->insn_op);
> +		else
> +			ptq->flags = PERF_IP_FLAG_BRANCH |
> +				     PERF_IP_FLAG_TRACE_BEGIN;
> +		if (ptq->state->flags & INTEL_PT_IN_TX)
> +			ptq->flags |= PERF_IP_FLAG_IN_TX;
> +		ptq->insn_len = ptq->state->insn_len;
> +	}
> +}
> +
> +static int intel_pt_setup_queue(struct intel_pt *pt,
> +				struct auxtrace_queue *queue,
> +				unsigned int queue_nr)
> +{
> +	struct intel_pt_queue *ptq = queue->priv;
> +
> +	if (list_empty(&queue->head))
> +		return 0;
> +
> +	if (!ptq) {
> +		ptq = intel_pt_alloc_queue(pt, queue_nr);
> +		if (!ptq)
> +			return -ENOMEM;
> +		queue->priv = ptq;
> +
> +		if (queue->cpu != -1)
> +			ptq->cpu = queue->cpu;
> +		ptq->tid = queue->tid;
> +
> +		if (pt->sampling_mode) {
> +			if (pt->timeless_decoding)
> +				ptq->step_through_buffers = true;
> +			if (pt->timeless_decoding || !pt->have_sched_switch)
> +				ptq->use_buffer_pid_tid = true;
> +		}
> +	}
> +
> +	if (!ptq->on_heap &&
> +	    (!pt->sync_switch ||
> +	     ptq->switch_state != INTEL_PT_SS_EXPECTING_SWITCH_EVENT)) {
> +		const struct intel_pt_state *state;
> +		int ret;
> +
> +		if (pt->timeless_decoding)
> +			return 0;
> +
> +		intel_pt_log("queue %u getting timestamp\n", queue_nr);
> +		intel_pt_log("queue %u decoding cpu %d pid %d tid %d\n",
> +			     queue_nr, ptq->cpu, ptq->pid, ptq->tid);
> +		while (1) {
> +			state = intel_pt_decode(ptq->decoder);
> +			if (state->err) {
> +				if (state->err == INTEL_PT_ERR_NODATA) {
> +					intel_pt_log("queue %u has no timestamp\n",
> +						     queue_nr);
> +					return 0;
> +				}
> +				continue;
> +			}
> +			if (state->timestamp)
> +				break;
> +		}
> +
> +		ptq->timestamp = state->timestamp;
> +		intel_pt_log("queue %u timestamp 0x%" PRIx64 "\n",
> +			     queue_nr, ptq->timestamp);
> +		ptq->state = state;
> +		ptq->have_sample = true;
> +		intel_pt_sample_flags(ptq);
> +		ret = auxtrace_heap__add(&pt->heap, queue_nr, ptq->timestamp);
> +		if (ret)
> +			return ret;
> +		ptq->on_heap = true;
> +	}
> +
> +	return 0;
> +}
> +
> +static int intel_pt_setup_queues(struct intel_pt *pt)
> +{
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < pt->queues.nr_queues; i++) {
> +		ret = intel_pt_setup_queue(pt, &pt->queues.queue_array[i], i);
> +		if (ret)
> +			return ret;
> +	}
> +	return 0;
> +}
> +
> +static int intel_pt_inject_event(union perf_event *event,
> +				 struct perf_sample *sample, u64 type,
> +				 bool swapped)
> +{
> +	event->header.size = perf_event__sample_event_size(sample, type, 0);
> +	return perf_event__synthesize_sample(event, type, 0, sample, swapped);
> +}
> +
> +static int intel_pt_synth_branch_sample(struct intel_pt_queue *ptq)
> +{
> +	int ret;
> +	struct intel_pt *pt = ptq->pt;
> +	union perf_event *event = ptq->event_buf;
> +	struct perf_sample sample = { .ip = 0, };
> +
> +	event->sample.header.type = PERF_RECORD_SAMPLE;
> +	event->sample.header.misc = PERF_RECORD_MISC_USER;
> +	event->sample.header.size = sizeof(struct perf_event_header);
> +
> +	if (!pt->timeless_decoding)
> +		sample.time = tsc_to_perf_time(ptq->timestamp, &pt->tc);
> +
> +	sample.ip = ptq->state->from_ip;
> +	sample.pid = ptq->pid;
> +	sample.tid = ptq->tid;
> +	sample.addr = ptq->state->to_ip;
> +	sample.id = ptq->pt->branches_id;
> +	sample.stream_id = ptq->pt->branches_id;
> +	sample.period = 1;
> +	sample.cpu = ptq->cpu;
> +
> +	if (pt->branches_filter && !(pt->branches_filter & ptq->flags))
> +		return 0;
> +
> +	if (pt->synth_opts.inject) {
> +		ret = intel_pt_inject_event(event, &sample,
> +					    pt->branches_sample_type,
> +					    pt->synth_needs_swap);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = perf_session__deliver_synth_event(pt->session, event, &sample);
> +	if (ret)
> +		pr_err("Intel Processor Trace: failed to deliver branch event, error %d\n",
> +		       ret);
> +
> +	return ret;
> +}
> +
> +static int intel_pt_synth_instruction_sample(struct intel_pt_queue *ptq)
> +{
> +	int ret;
> +	struct intel_pt *pt = ptq->pt;
> +	union perf_event *event = ptq->event_buf;
> +	struct perf_sample sample = { .ip = 0, };
> +
> +	event->sample.header.type = PERF_RECORD_SAMPLE;
> +	event->sample.header.misc = PERF_RECORD_MISC_USER;
> +	event->sample.header.size = sizeof(struct perf_event_header);
> +
> +	if (!pt->timeless_decoding)
> +		sample.time = tsc_to_perf_time(ptq->timestamp, &pt->tc);
> +
> +	sample.ip = ptq->state->from_ip;
> +	sample.pid = ptq->pid;
> +	sample.tid = ptq->tid;
> +	sample.addr = ptq->state->to_ip;
> +	sample.id = ptq->pt->instructions_id;
> +	sample.stream_id = ptq->pt->instructions_id;
> +	sample.period = ptq->pt->instructions_sample_period;
> +	sample.cpu = ptq->cpu;
> +
> +	if (pt->synth_opts.callchain) {
> +		thread_stack__sample(ptq->thread, ptq->chain,
> +				     pt->synth_opts.callchain_sz, sample.ip);
> +		sample.callchain = ptq->chain;
> +	}
> +
> +	if (pt->synth_opts.inject) {
> +		ret = intel_pt_inject_event(event, &sample,
> +					    pt->instructions_sample_type,
> +					    pt->synth_needs_swap);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = perf_session__deliver_synth_event(pt->session, event, &sample);
> +	if (ret)
> +		pr_err("Intel Processor Trace: failed to deliver instruction event, error %d\n",
> +		       ret);
> +
> +	return ret;
> +}
> +
> +static int intel_pt_synth_transaction_sample(struct intel_pt_queue *ptq)
> +{
> +	int ret;
> +	struct intel_pt *pt = ptq->pt;
> +	union perf_event *event = ptq->event_buf;
> +	struct perf_sample sample = { .ip = 0, };
> +
> +	event->sample.header.type = PERF_RECORD_SAMPLE;
> +	event->sample.header.misc = PERF_RECORD_MISC_USER;
> +	event->sample.header.size = sizeof(struct perf_event_header);
> +
> +	if (!pt->timeless_decoding)
> +		sample.time = tsc_to_perf_time(ptq->timestamp, &pt->tc);
> +
> +	sample.ip = ptq->state->from_ip;
> +	sample.pid = ptq->pid;
> +	sample.tid = ptq->tid;
> +	sample.addr = ptq->state->to_ip;
> +	sample.id = ptq->pt->transactions_id;
> +	sample.stream_id = ptq->pt->transactions_id;
> +	sample.period = 1;
> +	sample.cpu = ptq->cpu;
> +	sample.flags = ptq->flags;
> +	sample.insn_len = ptq->insn_len;
> +
> +	if (pt->synth_opts.callchain) {
> +		thread_stack__sample(ptq->thread, ptq->chain,
> +				     pt->synth_opts.callchain_sz, sample.ip);
> +		sample.callchain = ptq->chain;
> +	}
> +
> +	if (pt->synth_opts.inject) {
> +		ret = intel_pt_inject_event(event, &sample,
> +					    pt->transactions_sample_type,
> +					    pt->synth_needs_swap);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = perf_session__deliver_synth_event(pt->session, event, &sample);
> +	if (ret)
> +		pr_err("Intel Processor Trace: failed to deliver transaction event, error %d\n",
> +		       ret);
> +
> +	return ret;
> +}
> +
> +static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
> +				pid_t pid, pid_t tid, u64 ip)
> +{
> +	union perf_event event;
> +	char msg[MAX_AUXTRACE_ERROR_MSG];
> +	int err;
> +
> +	intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG);
> +
> +	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
> +			     code, cpu, pid, tid, ip, msg);
> +
> +	err = perf_session__deliver_synth_event(pt->session, &event, NULL);
> +	if (err)
> +		pr_err("Intel Processor Trace: failed to deliver error event, error %d\n",
> +		       err);
> +
> +	return err;
> +}
> +
> +static int intel_pt_next_tid(struct intel_pt *pt, struct intel_pt_queue *ptq)
> +{
> +	struct auxtrace_queue *queue;
> +	pid_t tid = ptq->next_tid;
> +	int err;
> +
> +	if (tid == -1)
> +		return 0;
> +
> +	intel_pt_log("switch: cpu %d tid %d\n", ptq->cpu, tid);
> +
> +	err = machine__set_current_tid(pt->machine, ptq->cpu, -1, tid);
> +
> +	queue = &pt->queues.queue_array[ptq->queue_nr];
> +	intel_pt_set_pid_tid_cpu(pt, queue);
> +
> +	ptq->next_tid = -1;
> +
> +	return err;
> +}
> +
> +static inline bool intel_pt_is_switch_ip(struct intel_pt_queue *ptq, u64 ip)
> +{
> +	struct intel_pt *pt = ptq->pt;
> +
> +	return ip == pt->switch_ip &&
> +	       (ptq->flags & PERF_IP_FLAG_BRANCH) &&
> +	       !(ptq->flags & (PERF_IP_FLAG_CONDITIONAL | PERF_IP_FLAG_ASYNC |
> +			       PERF_IP_FLAG_INTERRUPT | PERF_IP_FLAG_TX_ABORT));
> +}
> +
> +static int intel_pt_sample(struct intel_pt_queue *ptq)
> +{
> +	const struct intel_pt_state *state = ptq->state;
> +	struct intel_pt *pt = ptq->pt;
> +	int err;
> +
> +	if (!ptq->have_sample)
> +		return 0;
> +
> +	ptq->have_sample = false;
> +
> +	if (pt->sample_instructions &&
> +	    (state->type & INTEL_PT_INSTRUCTION)) {
> +		err = intel_pt_synth_instruction_sample(ptq);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (pt->sample_transactions &&
> +	    (state->type & INTEL_PT_TRANSACTION)) {
> +		err = intel_pt_synth_transaction_sample(ptq);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (!(state->type & INTEL_PT_BRANCH))
> +		return 0;
> +
> +	if (pt->synth_opts.callchain)
> +		thread_stack__event(ptq->thread, ptq->flags, state->from_ip,
> +				    state->to_ip, ptq->insn_len,
> +				    state->trace_nr);
> +
> +	if (pt->sample_branches) {
> +		err = intel_pt_synth_branch_sample(ptq);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (!pt->sync_switch)
> +		return 0;
> +
> +	if (intel_pt_is_switch_ip(ptq, state->to_ip)) {
> +		switch (ptq->switch_state) {
> +		case INTEL_PT_SS_UNKNOWN:
> +		case INTEL_PT_SS_EXPECTING_SWITCH_IP:
> +			err = intel_pt_next_tid(pt, ptq);
> +			if (err)
> +				return err;
> +			ptq->switch_state = INTEL_PT_SS_TRACING;
> +			break;
> +		default:
> +			ptq->switch_state = INTEL_PT_SS_EXPECTING_SWITCH_EVENT;
> +			return 1;
> +		}
> +	} else if (!state->to_ip) {
> +		ptq->switch_state = INTEL_PT_SS_NOT_TRACING;
> +	} else if (ptq->switch_state == INTEL_PT_SS_NOT_TRACING) {
> +		ptq->switch_state = INTEL_PT_SS_UNKNOWN;
> +	} else if (ptq->switch_state == INTEL_PT_SS_UNKNOWN &&
> +		   state->to_ip == pt->ptss_ip &&
> +		   (ptq->flags & PERF_IP_FLAG_CALL)) {
> +		ptq->switch_state = INTEL_PT_SS_TRACING;
> +	}
> +
> +	return 0;
> +}
> +
> +static u64 intel_pt_switch_ip(struct machine *machine, u64 *ptss_ip)
> +{
> +	struct map *map;
> +	struct symbol *sym, *start;
> +	u64 ip, switch_ip = 0;
> +
> +	if (ptss_ip)
> +		*ptss_ip = 0;
> +
> +	map = machine__kernel_map(machine, MAP__FUNCTION);
> +	if (!map)
> +		return 0;
> +
> +	if (map__load(map, machine->symbol_filter))
> +		return 0;
> +
> +	start = dso__first_symbol(map->dso, MAP__FUNCTION);
> +
> +	for (sym = start; sym; sym = dso__next_symbol(sym)) {
> +		if (sym->binding == STB_GLOBAL &&
> +		    !strcmp(sym->name, "__switch_to")) {
> +			ip = map->unmap_ip(map, sym->start);
> +			if (ip >= map->start && ip < map->end) {
> +				switch_ip = ip;
> +				break;
> +			}
> +		}
> +	}
> +
> +	if (!switch_ip || !ptss_ip)
> +		return 0;
> +
> +	for (sym = start; sym; sym = dso__next_symbol(sym)) {
> +		if (!strcmp(sym->name, "perf_trace_sched_switch")) {
> +			ip = map->unmap_ip(map, sym->start);
> +			if (ip >= map->start && ip < map->end) {
> +				*ptss_ip = ip;
> +				break;
> +			}
> +		}
> +	}
> +
> +	return switch_ip;
> +}
> +
> +static int intel_pt_run_decoder(struct intel_pt_queue *ptq, u64 *timestamp)
> +{
> +	const struct intel_pt_state *state = ptq->state;
> +	struct intel_pt *pt = ptq->pt;
> +	int err;
> +
> +	if (!pt->kernel_start) {
> +		pt->kernel_start = machine__kernel_start(pt->machine);
> +		if (pt->per_cpu_mmaps && pt->have_sched_switch &&
> +		    !pt->timeless_decoding && intel_pt_tracing_kernel(pt) &&
> +		    !pt->sampling_mode) {
> +			pt->switch_ip = intel_pt_switch_ip(pt->machine,
> +							   &pt->ptss_ip);
> +			if (pt->switch_ip) {
> +				intel_pt_log("switch_ip: %"PRIx64" ptss_ip: %"PRIx64"\n",
> +					     pt->switch_ip, pt->ptss_ip);
> +				pt->sync_switch = true;
> +				pt->est_tsc_orig = pt->est_tsc;
> +				pt->est_tsc = false;
> +			}
> +		}
> +	}
> +
> +	intel_pt_log("queue %u decoding cpu %d pid %d tid %d\n",
> +		     ptq->queue_nr, ptq->cpu, ptq->pid, ptq->tid);
> +	while (1) {
> +		err = intel_pt_sample(ptq);
> +		if (err)
> +			return err;
> +
> +		state = intel_pt_decode(ptq->decoder);
> +		if (state->err) {
> +			if (state->err == INTEL_PT_ERR_NODATA)
> +				return 1;
> +			if (pt->sync_switch &&
> +			    state->from_ip >= pt->kernel_start) {
> +				pt->sync_switch = false;
> +				pt->est_tsc = pt->est_tsc_orig;
> +				intel_pt_next_tid(pt, ptq);
> +			}
> +			if (pt->synth_opts.errors) {
> +				err = intel_pt_synth_error(pt, state->err,
> +							   ptq->cpu, ptq->pid,
> +							   ptq->tid,
> +							   state->from_ip);
> +				if (err)
> +					return err;
> +			}
> +			continue;
> +		}
> +
> +		ptq->state = state;
> +		ptq->have_sample = true;
> +		intel_pt_sample_flags(ptq);
> +
> +		/* Use estimated TSC upon return to user space */
> +		if (pt->est_tsc) {
> +			if (state->from_ip >= pt->kernel_start &&
> +			    state->to_ip &&
> +			    state->to_ip < pt->kernel_start)
> +				ptq->timestamp = state->est_timestamp;
> +			else if (state->timestamp > ptq->timestamp)
> +				ptq->timestamp = state->timestamp;
> +		/* Use estimated TSC in unknown switch state */
> +		} else if (pt->sync_switch &&
> +			   ptq->switch_state == INTEL_PT_SS_UNKNOWN &&
> +			   state->to_ip == pt->switch_ip &&
> +			   (ptq->flags & PERF_IP_FLAG_CALL) &&
> +			   ptq->next_tid == -1) {
> +			ptq->timestamp = state->est_timestamp;
> +		} else if (state->timestamp > ptq->timestamp) {
> +			ptq->timestamp = state->timestamp;
> +		}
> +
> +		if (!pt->timeless_decoding && ptq->timestamp >= *timestamp) {
> +			*timestamp = ptq->timestamp;
> +			return 0;
> +		}
> +	}
> +	return 0;
> +}
> +
> +static inline int intel_pt_update_queues(struct intel_pt *pt)
> +{
> +	if (pt->queues.new_data) {
> +		pt->queues.new_data = false;
> +		return intel_pt_setup_queues(pt);
> +	}
> +	return 0;
> +}
> +
> +static int intel_pt_process_queues(struct intel_pt *pt, u64 timestamp)
> +{
> +	unsigned int queue_nr;
> +	u64 ts;
> +	int ret;
> +
> +	while (1) {
> +		struct auxtrace_queue *queue;
> +		struct intel_pt_queue *ptq;
> +
> +		if (!pt->heap.heap_cnt)
> +			return 0;
> +
> +		if (pt->heap.heap_array[0].ordinal >= timestamp)
> +			return 0;
> +
> +		queue_nr = pt->heap.heap_array[0].queue_nr;
> +		queue = &pt->queues.queue_array[queue_nr];
> +		ptq = queue->priv;
> +
> +		intel_pt_log("queue %u processing 0x%" PRIx64 " to 0x%" PRIx64 "\n",
> +			     queue_nr, pt->heap.heap_array[0].ordinal,
> +			     timestamp);
> +
> +		auxtrace_heap__pop(&pt->heap);
> +
> +		if (pt->heap.heap_cnt) {
> +			ts = pt->heap.heap_array[0].ordinal + 1;
> +			if (ts > timestamp)
> +				ts = timestamp;
> +		} else {
> +			ts = timestamp;
> +		}
> +
> +		intel_pt_set_pid_tid_cpu(pt, queue);
> +
> +		ret = intel_pt_run_decoder(ptq, &ts);
> +
> +		if (ret < 0) {
> +			auxtrace_heap__add(&pt->heap, queue_nr, ts);
> +			return ret;
> +		}
> +
> +		if (!ret) {
> +			ret = auxtrace_heap__add(&pt->heap, queue_nr, ts);
> +			if (ret < 0)
> +				return ret;
> +		} else {
> +			ptq->on_heap = false;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int intel_pt_process_timeless_queues(struct intel_pt *pt, pid_t tid,
> +					    u64 time_)
> +{
> +	struct auxtrace_queues *queues = &pt->queues;
> +	unsigned int i;
> +	u64 ts = 0;
> +
> +	for (i = 0; i < queues->nr_queues; i++) {
> +		struct auxtrace_queue *queue = &pt->queues.queue_array[i];
> +		struct intel_pt_queue *ptq = queue->priv;
> +
> +		if (ptq && (tid == -1 || ptq->tid == tid)) {
> +			ptq->time = time_;
> +			intel_pt_set_pid_tid_cpu(pt, queue);
> +			intel_pt_run_decoder(ptq, &ts);
> +		}
> +	}
> +	return 0;
> +}
> +
> +static int intel_pt_lost(struct intel_pt *pt, struct perf_sample *sample)
> +{
> +	return intel_pt_synth_error(pt, INTEL_PT_ERR_LOST, sample->cpu,
> +				    sample->pid, sample->tid, 0);
> +}
> +
> +static struct intel_pt_queue *intel_pt_cpu_to_ptq(struct intel_pt *pt, int cpu)
> +{
> +	unsigned i, j;
> +
> +	if (cpu < 0 || !pt->queues.nr_queues)
> +		return NULL;
> +
> +	if ((unsigned)cpu >= pt->queues.nr_queues)
> +		i = pt->queues.nr_queues - 1;
> +	else
> +		i = cpu;
> +
> +	if (pt->queues.queue_array[i].cpu == cpu)
> +		return pt->queues.queue_array[i].priv;
> +
> +	for (j = 0; i > 0; j++) {
> +		if (pt->queues.queue_array[--i].cpu == cpu)
> +			return pt->queues.queue_array[i].priv;
> +	}
> +
> +	for (; j < pt->queues.nr_queues; j++) {
> +		if (pt->queues.queue_array[j].cpu == cpu)
> +			return pt->queues.queue_array[j].priv;
> +	}
> +
> +	return NULL;
> +}
> +
> +static int intel_pt_process_switch(struct intel_pt *pt,
> +				   struct perf_sample *sample)
> +{
> +	struct intel_pt_queue *ptq;
> +	struct perf_evsel *evsel;
> +	pid_t tid;
> +	int cpu, err;
> +
> +	evsel = perf_evlist__id2evsel(pt->session->evlist, sample->id);
> +	if (evsel != pt->switch_evsel)
> +		return 0;
> +
> +	tid = perf_evsel__intval(evsel, sample, "next_pid");
> +	cpu = sample->cpu;
> +
> +	intel_pt_log("sched_switch: cpu %d tid %d time %"PRIu64" tsc %#"PRIx64"\n",
> +		     cpu, tid, sample->time, perf_time_to_tsc(sample->time,
> +		     &pt->tc));
> +
> +	if (!pt->sync_switch)
> +		goto out;
> +
> +	ptq = intel_pt_cpu_to_ptq(pt, cpu);
> +	if (!ptq)
> +		goto out;
> +
> +	switch (ptq->switch_state) {
> +	case INTEL_PT_SS_NOT_TRACING:
> +		ptq->next_tid = -1;
> +		break;
> +	case INTEL_PT_SS_UNKNOWN:
> +	case INTEL_PT_SS_TRACING:
> +		ptq->next_tid = tid;
> +		ptq->switch_state = INTEL_PT_SS_EXPECTING_SWITCH_IP;
> +		return 0;
> +	case INTEL_PT_SS_EXPECTING_SWITCH_EVENT:
> +		if (!ptq->on_heap) {
> +			ptq->timestamp = perf_time_to_tsc(sample->time,
> +							  &pt->tc);
> +			err = auxtrace_heap__add(&pt->heap, ptq->queue_nr,
> +						 ptq->timestamp);
> +			if (err)
> +				return err;
> +			ptq->on_heap = true;
> +		}
> +		ptq->switch_state = INTEL_PT_SS_TRACING;
> +		break;
> +	case INTEL_PT_SS_EXPECTING_SWITCH_IP:
> +		ptq->next_tid = tid;
> +		intel_pt_log("ERROR: cpu %d expecting switch ip\n", cpu);
> +		break;
> +	default:
> +		break;
> +	}
> +out:
> +	return machine__set_current_tid(pt->machine, cpu, -1, tid);
> +}
> +
> +static int intel_pt_process_itrace_start(struct intel_pt *pt,
> +					 union perf_event *event,
> +					 struct perf_sample *sample)
> +{
> +	if (!pt->per_cpu_mmaps)
> +		return 0;
> +
> +	intel_pt_log("itrace_start: cpu %d pid %d tid %d time %"PRIu64" tsc %#"PRIx64"\n",
> +		     sample->cpu, event->itrace_start.pid,
> +		     event->itrace_start.tid, sample->time,
> +		     perf_time_to_tsc(sample->time, &pt->tc));
> +
> +	return machine__set_current_tid(pt->machine, sample->cpu,
> +					event->itrace_start.pid,
> +					event->itrace_start.tid);
> +}
> +
> +static int intel_pt_process_event(struct perf_session *session,
> +				  union perf_event *event,
> +				  struct perf_sample *sample,
> +				  struct perf_tool *tool)
> +{
> +	struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt,
> +					   auxtrace);
> +	u64 timestamp;
> +	int err = 0;
> +
> +	if (dump_trace)
> +		return 0;
> +
> +	if (!tool->ordered_events) {
> +		pr_err("Intel Processor Trace requires ordered events\n");
> +		return -EINVAL;
> +	}
> +
> +	if (sample->time)
> +		timestamp = perf_time_to_tsc(sample->time, &pt->tc);
> +	else
> +		timestamp = 0;
> +
> +	if (timestamp || pt->timeless_decoding) {
> +		err = intel_pt_update_queues(pt);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (pt->timeless_decoding) {
> +		if (event->header.type == PERF_RECORD_EXIT) {
> +			err = intel_pt_process_timeless_queues(pt,
> +							       event->comm.tid,
> +							       sample->time);
> +		}
> +	} else if (timestamp) {
> +		err = intel_pt_process_queues(pt, timestamp);
> +	}
> +	if (err)
> +		return err;
> +
> +	if (event->header.type == PERF_RECORD_AUX &&
> +	    (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
> +	    pt->synth_opts.errors)
> +		err = intel_pt_lost(pt, sample);
> +
> +	if (pt->switch_evsel && event->header.type == PERF_RECORD_SAMPLE)
> +		err = intel_pt_process_switch(pt, sample);
> +	else if (event->header.type == PERF_RECORD_ITRACE_START)
> +		err = intel_pt_process_itrace_start(pt, event, sample);
> +
> +	return err;
> +}
> +
> +static int intel_pt_flush(struct perf_session *session, struct perf_tool *tool)
> +{
> +	struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt,
> +					   auxtrace);
> +	int ret;
> +
> +	if (dump_trace)
> +		return 0;
> +
> +	if (!tool->ordered_events)
> +		return -EINVAL;
> +
> +	ret = intel_pt_update_queues(pt);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (pt->timeless_decoding)
> +		return intel_pt_process_timeless_queues(pt, -1,
> +							MAX_TIMESTAMP - 1);
> +
> +	return intel_pt_process_queues(pt, MAX_TIMESTAMP);
> +}
> +
> +static void intel_pt_free_events(struct perf_session *session)
> +{
> +	struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt,
> +					   auxtrace);
> +	struct auxtrace_queues *queues = &pt->queues;
> +	unsigned int i;
> +
> +	for (i = 0; i < queues->nr_queues; i++) {
> +		intel_pt_free_queue(queues->queue_array[i].priv);
> +		queues->queue_array[i].priv = NULL;
> +	}
> +	intel_pt_log_disable();
> +	auxtrace_queues__free(queues);
> +}
> +
> +static void intel_pt_free(struct perf_session *session)
> +{
> +	struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt,
> +					   auxtrace);
> +
> +	auxtrace_heap__free(&pt->heap);
> +	intel_pt_free_events(session);
> +	session->auxtrace = NULL;
> +	thread__delete(pt->unknown_thread);
> +	free(pt);
> +}
> +
> +static int intel_pt_process_auxtrace_event(struct perf_session *session,
> +					   union perf_event *event,
> +					   struct perf_tool *tool __maybe_unused)
> +{
> +	struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt,
> +					   auxtrace);
> +
> +	if (pt->sampling_mode)
> +		return 0;
> +
> +	if (!pt->data_queued) {
> +		struct auxtrace_buffer *buffer;
> +		off_t data_offset;
> +		int fd = perf_data_file__fd(session->file);
> +		int err;
> +
> +		if (perf_data_file__is_pipe(session->file)) {
> +			data_offset = 0;
> +		} else {
> +			data_offset = lseek(fd, 0, SEEK_CUR);
> +			if (data_offset == -1)
> +				return -errno;
> +		}
> +
> +		err = auxtrace_queues__add_event(&pt->queues, session, event,
> +						 data_offset, &buffer);
> +		if (err)
> +			return err;
> +
> +		/* Dump here now we have copied a piped trace out of the pipe */
> +		if (dump_trace) {
> +			if (auxtrace_buffer__get_data(buffer, fd)) {
> +				intel_pt_dump_event(pt, buffer->data,
> +						    buffer->size);
> +				auxtrace_buffer__put_data(buffer);
> +			}
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +struct intel_pt_synth {
> +	struct perf_tool dummy_tool;
> +	struct perf_session *session;
> +};
> +
> +static int intel_pt_event_synth(struct perf_tool *tool,
> +				union perf_event *event,
> +				struct perf_sample *sample __maybe_unused,
> +				struct machine *machine __maybe_unused)
> +{
> +	struct intel_pt_synth *intel_pt_synth =
> +			container_of(tool, struct intel_pt_synth, dummy_tool);
> +
> +	return perf_session__deliver_synth_event(intel_pt_synth->session, event,
> +						 NULL);
> +}
> +
> +static int intel_pt_synth_event(struct perf_session *session,
> +				struct perf_event_attr *attr, u64 id)
> +{
> +	struct intel_pt_synth intel_pt_synth;
> +
> +	memset(&intel_pt_synth, 0, sizeof(struct intel_pt_synth));
> +	intel_pt_synth.session = session;
> +
> +	return perf_event__synthesize_attr(&intel_pt_synth.dummy_tool, attr, 1,
> +					   &id, intel_pt_event_synth);
> +}
> +
> +static int intel_pt_synth_events(struct intel_pt *pt,
> +				 struct perf_session *session)
> +{
> +	struct perf_evlist *evlist = session->evlist;
> +	struct perf_evsel *evsel;
> +	struct perf_event_attr attr;
> +	bool found = false;
> +	u64 id;
> +	int err;
> +
> +	evlist__for_each(evlist, evsel) {
> +		if (evsel->attr.type == pt->pmu_type && evsel->ids) {
> +			found = true;
> +			break;
> +		}
> +	}
> +
> +	if (!found) {
> +		pr_debug("There are no selected events with Intel Processor Trace data\n");
> +		return 0;
> +	}
> +
> +	memset(&attr, 0, sizeof(struct perf_event_attr));
> +	attr.size = sizeof(struct perf_event_attr);
> +	attr.type = PERF_TYPE_HARDWARE;
> +	attr.sample_type = evsel->attr.sample_type & PERF_SAMPLE_MASK;
> +	attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
> +			    PERF_SAMPLE_PERIOD;
> +	if (pt->timeless_decoding)
> +		attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
> +	else
> +		attr.sample_type |= PERF_SAMPLE_TIME;
> +	if (!pt->per_cpu_mmaps)
> +		attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
> +	attr.exclude_user = evsel->attr.exclude_user;
> +	attr.exclude_kernel = evsel->attr.exclude_kernel;
> +	attr.exclude_hv = evsel->attr.exclude_hv;
> +	attr.exclude_host = evsel->attr.exclude_host;
> +	attr.exclude_guest = evsel->attr.exclude_guest;
> +	attr.sample_id_all = evsel->attr.sample_id_all;
> +	attr.read_format = evsel->attr.read_format;
> +
> +	id = evsel->id[0] + 1000000000;
> +	if (!id)
> +		id = 1;
> +
> +	if (pt->synth_opts.instructions) {
> +		attr.config = PERF_COUNT_HW_INSTRUCTIONS;
> +		if (pt->synth_opts.period_type == PERF_ITRACE_PERIOD_NANOSECS)
> +			attr.sample_period =
> +				intel_pt_ns_to_ticks(pt, pt->synth_opts.period);
> +		else
> +			attr.sample_period = pt->synth_opts.period;
> +		pt->instructions_sample_period = attr.sample_period;
> +		if (pt->synth_opts.callchain)
> +			attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
> +		pr_debug("Synthesizing 'instructions' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
> +			 id, (u64)attr.sample_type);
> +		err = intel_pt_synth_event(session, &attr, id);
> +		if (err) {
> +			pr_err("%s: failed to synthesize 'instructions' event type\n",
> +			       __func__);
> +			return err;
> +		}
> +		pt->sample_instructions = true;
> +		pt->instructions_sample_type = attr.sample_type;
> +		pt->instructions_id = id;
> +		id += 1;
> +	}
> +
> +	if (pt->synth_opts.transactions) {
> +		attr.config = PERF_COUNT_HW_INSTRUCTIONS;
> +		attr.sample_period = 1;
> +		if (pt->synth_opts.callchain)
> +			attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
> +		pr_debug("Synthesizing 'transactions' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
> +			 id, (u64)attr.sample_type);
> +		err = intel_pt_synth_event(session, &attr, id);
> +		if (err) {
> +			pr_err("%s: failed to synthesize 'transactions' event type\n",
> +			       __func__);
> +			return err;
> +		}
> +		pt->sample_transactions = true;
> +		pt->transactions_id = id;
> +		id += 1;
> +		evlist__for_each(evlist, evsel) {
> +			if (evsel->id && evsel->id[0] == pt->transactions_id) {
> +				if (evsel->name)
> +					zfree(&evsel->name);
> +				evsel->name = strdup("transactions");
> +				break;
> +			}
> +		}
> +	}
> +
> +	if (pt->synth_opts.branches) {
> +		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
> +		attr.sample_period = 1;
> +		attr.sample_type |= PERF_SAMPLE_ADDR;
> +		attr.sample_type &= ~(u64)PERF_SAMPLE_CALLCHAIN;
> +		pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
> +			 id, (u64)attr.sample_type);
> +		err = intel_pt_synth_event(session, &attr, id);
> +		if (err) {
> +			pr_err("%s: failed to synthesize 'branches' event type\n",
> +			       __func__);
> +			return err;
> +		}
> +		pt->sample_branches = true;
> +		pt->branches_sample_type = attr.sample_type;
> +		pt->branches_id = id;
> +	}
> +
> +	pt->synth_needs_swap = evsel->needs_swap;
> +
> +	return 0;
> +}
> +
> +static struct perf_evsel *intel_pt_find_sched_switch(struct perf_evlist *evlist)
> +{
> +	struct perf_evsel *evsel;
> +
> +	evlist__for_each_reverse(evlist, evsel) {
> +		const char *name = perf_evsel__name(evsel);
> +
> +		if (!strcmp(name, "sched:sched_switch"))
> +			return evsel;
> +	}
> +
> +	return NULL;
> +}
> +
> +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",
> +};
> +
> +static void intel_pt_print_info(u64 *arr, int start, int finish)
> +{
> +	int i;
> +
> +	if (!dump_trace)
> +		return;
> +
> +	for (i = start; i <= finish; i++)
> +		fprintf(stdout, intel_pt_info_fmts[i], arr[i]);
> +}
> +
> +int intel_pt_process_auxtrace_info(union perf_event *event,
> +				   struct perf_session *session)
> +{
> +	struct auxtrace_info_event *auxtrace_info = &event->auxtrace_info;
> +	size_t min_sz = sizeof(u64) * INTEL_PT_PER_CPU_MMAPS;
> +	struct intel_pt *pt;
> +	int err;
> +
> +	if (auxtrace_info->header.size < sizeof(struct auxtrace_info_event) +
> +					min_sz)
> +		return -EINVAL;
> +
> +	pt = zalloc(sizeof(struct intel_pt));
> +	if (!pt)
> +		return -ENOMEM;
> +
> +	err = auxtrace_queues__init(&pt->queues);
> +	if (err)
> +		goto err_free;
> +
> +	intel_pt_log_set_name(INTEL_PT_PMU_NAME);
> +
> +	pt->session = session;
> +	pt->machine = &session->machines.host; /* No kvm support */
> +	pt->auxtrace_type = auxtrace_info->type;
> +	pt->pmu_type = auxtrace_info->priv[INTEL_PT_PMU_TYPE];
> +	pt->tc.time_shift = auxtrace_info->priv[INTEL_PT_TIME_SHIFT];
> +	pt->tc.time_mult = auxtrace_info->priv[INTEL_PT_TIME_MULT];
> +	pt->tc.time_zero = auxtrace_info->priv[INTEL_PT_TIME_ZERO];
> +	pt->cap_user_time_zero = auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO];
> +	pt->tsc_bit = auxtrace_info->priv[INTEL_PT_TSC_BIT];
> +	pt->noretcomp_bit = auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT];
> +	pt->have_sched_switch = auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH];
> +	pt->snapshot_mode = auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE];
> +	pt->per_cpu_mmaps = auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS];
> +	intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_PMU_TYPE,
> +			    INTEL_PT_PER_CPU_MMAPS);
> +
> +	pt->timeless_decoding = intel_pt_timeless_decoding(pt);
> +	pt->have_tsc = intel_pt_have_tsc(pt);
> +	pt->sampling_mode = false;
> +	pt->est_tsc = pt->per_cpu_mmaps && !pt->timeless_decoding;
> +
> +	pt->unknown_thread = thread__new(999999999, 999999999);
> +	if (!pt->unknown_thread) {
> +		err = -ENOMEM;
> +		goto err_free_queues;
> +	}
> +	err = thread__set_comm(pt->unknown_thread, "unknown", 0);
> +	if (err)
> +		goto err_delete_thread;
> +	if (thread__init_map_groups(pt->unknown_thread, pt->machine)) {
> +		err = -ENOMEM;
> +		goto err_delete_thread;
> +	}
> +
> +	pt->auxtrace.process_event = intel_pt_process_event;
> +	pt->auxtrace.process_auxtrace_event = intel_pt_process_auxtrace_event;
> +	pt->auxtrace.flush_events = intel_pt_flush;
> +	pt->auxtrace.free_events = intel_pt_free_events;
> +	pt->auxtrace.free = intel_pt_free;
> +	session->auxtrace = &pt->auxtrace;
> +
> +	if (dump_trace)
> +		return 0;
> +
> +	if (pt->have_sched_switch == 1) {
> +		pt->switch_evsel = intel_pt_find_sched_switch(session->evlist);
> +		if (!pt->switch_evsel) {
> +			pr_err("%s: missing sched_switch event\n", __func__);
> +			goto err_delete_thread;
> +		}
> +	}
> +
> +	if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
> +		pt->synth_opts = *session->itrace_synth_opts;
> +	} else {
> +		itrace_synth_opts__set_default(&pt->synth_opts);
> +		if (use_browser != -1) {
> +			pt->synth_opts.branches = false;
> +			pt->synth_opts.callchain = true;
> +		}
> +	}
> +
> +	if (pt->synth_opts.log)
> +		intel_pt_log_enable();
> +
> +	if (pt->synth_opts.calls)
> +		pt->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
> +				       PERF_IP_FLAG_TRACE_END;
> +	if (pt->synth_opts.returns)
> +		pt->branches_filter |= PERF_IP_FLAG_RETURN |
> +				       PERF_IP_FLAG_TRACE_BEGIN;
> +
> +	if (pt->synth_opts.callchain && !symbol_conf.use_callchain) {
> +		symbol_conf.use_callchain = true;
> +		if (callchain_register_param(&callchain_param) < 0) {
> +			symbol_conf.use_callchain = false;
> +			pt->synth_opts.callchain = false;
> +		}
> +	}
> +
> +	err = intel_pt_synth_events(pt, session);
> +	if (err)
> +		goto err_delete_thread;
> +
> +	err = auxtrace_queues__process_index(&pt->queues, session);
> +	if (err)
> +		goto err_delete_thread;
> +
> +	if (pt->queues.populated)
> +		pt->data_queued = true;
> +
> +	if (pt->timeless_decoding)
> +		pr_debug2("Intel PT decoding without timestamps\n");
> +
> +	return 0;
> +
> +err_delete_thread:
> +	thread__delete(pt->unknown_thread);
> +err_free_queues:
> +	intel_pt_log_disable();
> +	auxtrace_queues__free(&pt->queues);
> +	session->auxtrace = NULL;
> +err_free:
> +	free(pt);
> +	return err;
> +}
> diff --git a/tools/perf/util/intel-pt.h b/tools/perf/util/intel-pt.h
> new file mode 100644
> index 0000000..a1bfe93
> --- /dev/null
> +++ b/tools/perf/util/intel-pt.h
> @@ -0,0 +1,51 @@
> +/*
> + * intel_pt.h: Intel Processor Trace support
> + * Copyright (c) 2013-2015, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#ifndef INCLUDE__PERF_INTEL_PT_H__
> +#define INCLUDE__PERF_INTEL_PT_H__
> +
> +#define INTEL_PT_PMU_NAME "intel_pt"
> +
> +enum {
> +	INTEL_PT_PMU_TYPE,
> +	INTEL_PT_TIME_SHIFT,
> +	INTEL_PT_TIME_MULT,
> +	INTEL_PT_TIME_ZERO,
> +	INTEL_PT_CAP_USER_TIME_ZERO,
> +	INTEL_PT_TSC_BIT,
> +	INTEL_PT_NORETCOMP_BIT,
> +	INTEL_PT_HAVE_SCHED_SWITCH,
> +	INTEL_PT_SNAPSHOT_MODE,
> +	INTEL_PT_PER_CPU_MMAPS,
> +	INTEL_PT_AUXTRACE_PRIV_MAX,
> +};
> +
> +#define INTEL_PT_AUXTRACE_PRIV_SIZE (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64))
> +
> +struct auxtrace_record;
> +struct perf_tool;
> +union perf_event;
> +struct perf_session;
> +struct perf_event_attr;
> +struct perf_pmu;
> +
> +struct auxtrace_record *intel_pt_recording_init(int *err);
> +
> +int intel_pt_process_auxtrace_info(union perf_event *event,
> +				   struct perf_session *session);
> +
> +struct perf_event_attr *intel_pt_pmu_default_config(struct perf_pmu *pmu);
> +
> +#endif
> -- 
> 1.9.1
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