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    Subject[PATCH V2 30/30] perf tools: adding coresight etm PMU record capabilities
    Date
    Coresight ETMs are IP blocks allowing to perform HW assisted tracing
    on a CPU core. This patch introduce the required auxiliary API
    functions allowing the perf core to interact with a tracer.

    Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
    ---
    tools/perf/arch/arm/util/Build | 2 +-
    tools/perf/arch/arm/util/auxtrace.c | 48 ++++
    tools/perf/arch/arm/util/cs_etm.c | 444 ++++++++++++++++++++++++++++++++++++
    tools/perf/arch/arm/util/cs_etm.h | 37 +++
    4 files changed, 530 insertions(+), 1 deletion(-)
    create mode 100644 tools/perf/arch/arm/util/auxtrace.c
    create mode 100644 tools/perf/arch/arm/util/cs_etm.c
    create mode 100644 tools/perf/arch/arm/util/cs_etm.h

    diff --git a/tools/perf/arch/arm/util/Build b/tools/perf/arch/arm/util/Build
    index 371a3bf12297..87545604b029 100644
    --- a/tools/perf/arch/arm/util/Build
    +++ b/tools/perf/arch/arm/util/Build
    @@ -3,4 +3,4 @@ libperf-$(CONFIG_DWARF) += dwarf-regs.o
    libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
    libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

    -libperf-$(CONFIG_AUXTRACE_ARM) += pmu.o
    +libperf-$(CONFIG_AUXTRACE_ARM) += pmu.o auxtrace.o cs_etm.o
    diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
    new file mode 100644
    index 000000000000..4988fdf7cb8a
    --- /dev/null
    +++ b/tools/perf/arch/arm/util/auxtrace.c
    @@ -0,0 +1,48 @@
    +/*
    + * Copyright(C) 2015 Linaro Limited. All rights reserved.
    + * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License version 2 as published by
    + * the Free Software Foundation.
    + *
    + * This program is distributed in the hope that 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.
    + *
    + * You should have received a copy of the GNU General Public License along with
    + * this program. If not, see <http://www.gnu.org/licenses/>.
    + */
    +
    +#include <stdbool.h>
    +#include <linux/coresight-pmu.h>
    +
    +#include "../../util/auxtrace.h"
    +#include "../../util/evlist.h"
    +#include "../../util/pmu.h"
    +#include "cs_etm.h"
    +
    +struct auxtrace_record
    +*auxtrace_record__init(struct perf_evlist *evlist, int *err)
    +{
    + struct perf_pmu *cs_etm_pmu;
    + struct perf_evsel *evsel;
    + bool found_etm = false;
    +
    + cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
    +
    + if (evlist) {
    + evlist__for_each(evlist, evsel) {
    + if (cs_etm_pmu &&
    + evsel->attr.type == cs_etm_pmu->type)
    + found_etm = true;
    + }
    + }
    +
    + if (found_etm)
    + return cs_etm_record_init(err);
    +
    + *err = -EINVAL;
    + return NULL;
    +}
    diff --git a/tools/perf/arch/arm/util/cs_etm.c b/tools/perf/arch/arm/util/cs_etm.c
    new file mode 100644
    index 000000000000..2e89b44dd4da
    --- /dev/null
    +++ b/tools/perf/arch/arm/util/cs_etm.c
    @@ -0,0 +1,444 @@
    +/*
    + * Copyright(C) 2015 Linaro Limited. All rights reserved.
    + * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License version 2 as published by
    + * the Free Software Foundation.
    + *
    + * This program is distributed in the hope that 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.
    + *
    + * You should have received a copy of the GNU General Public License along with
    + * this program. If not, see <http://www.gnu.org/licenses/>.
    + */
    +
    +#include <api/fs/fs.h>
    +#include <linux/bitops.h>
    +#include <linux/coresight-pmu.h>
    +#include <linux/kernel.h>
    +#include <linux/log2.h>
    +#include <linux/types.h>
    +
    +#include "../../perf.h"
    +#include "../../util/auxtrace.h"
    +#include "../../util/cpumap.h"
    +#include "../../util/evlist.h"
    +#include "../../util/pmu.h"
    +#include "../../util/thread_map.h"
    +#include "cs_etm.h"
    +
    +#include <stdlib.h>
    +
    +/* Also used by Intel - should go to a common header */
    +#define KiB(x) ((x) * 1024)
    +#define MiB(x) ((x) * 1024 * 1024)
    +
    +struct cs_etm_recording {
    + struct auxtrace_record itr;
    + struct perf_pmu *cs_etm_pmu;
    + struct perf_evlist *evlist;
    + bool snapshot_mode;
    + size_t snapshot_size;
    +};
    +
    +static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr,
    + struct record_opts *opts,
    + const char *str)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_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;
    +}
    +
    +static int cs_etm_recording_options(struct auxtrace_record *itr,
    + struct perf_evlist *evlist,
    + struct record_opts *opts)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    + struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
    + struct perf_evsel *evsel, *cs_etm_evsel = NULL;
    + const struct cpu_map *cpus = evlist->cpus;
    + bool privileged = (geteuid() == 0 || perf_event_paranoid() < 0);
    +
    + ptr->evlist = evlist;
    + ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
    +
    + evlist__for_each(evlist, evsel) {
    + if (evsel->attr.type == cs_etm_pmu->type) {
    + if (cs_etm_evsel) {
    + pr_err("There may be only one %s event\n",
    + CORESIGHT_ETM_PMU_NAME);
    + return -EINVAL;
    + }
    + evsel->attr.freq = 0;
    + evsel->attr.sample_period = 1;
    + cs_etm_evsel = evsel;
    + opts->full_auxtrace = true;
    + }
    + }
    +
    + /* no need to continue if at least one event of interest was found */
    + if (!cs_etm_evsel)
    + return 0;
    +
    + if (opts->use_clockid) {
    + pr_err("Cannot use clockid (-k option) with %s\n",
    + CORESIGHT_ETM_PMU_NAME);
    + return -EINVAL;
    + }
    +
    + /* we are in snapshot mode */
    + if (opts->auxtrace_snapshot_mode) {
    + /*
    + * No size were given to '-S' or '-m,', so go with
    + * the default
    + */
    + 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;
    + }
    +
    + /*
    + * '-m,xyz' was specified but no snapshot size, so make the
    + * snapshot size as big as the auxtrace mmap area.
    + */
    + if (!opts->auxtrace_snapshot_size) {
    + opts->auxtrace_snapshot_size =
    + opts->auxtrace_mmap_pages * (size_t)page_size;
    + }
    +
    + /*
    + * -Sxyz was specified but no auxtrace mmap area, so make the
    + * auxtrace mmap area big enough to fit the requested snapshot
    + * 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);
    + }
    +
    + /* Snapshost size can't be bigger than the auxtrace area */
    + 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;
    + }
    +
    + /* Something went wrong somewhere - this shouldn't happen */
    + 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;
    + }
    + }
    +
    + /* We are in full trace mode but '-m,xyz' wasn't specified */
    + 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 provided by user */
    + if (opts->auxtrace_mmap_pages) {
    + unsigned int max_page = (KiB(128) / page_size);
    + size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
    +
    + if (!privileged &&
    + opts->auxtrace_mmap_pages > max_page) {
    + opts->auxtrace_mmap_pages = max_page;
    + pr_err("auxtrace too big, truncating to %d\n",
    + max_page);
    + }
    +
    + if (!is_power_of_2(sz)) {
    + pr_err("Invalid mmap size for %s: must be a power of 2\n",
    + CORESIGHT_ETM_PMU_NAME);
    + return -EINVAL;
    + }
    + }
    +
    + if (opts->auxtrace_snapshot_mode)
    + pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
    + opts->auxtrace_snapshot_size);
    +
    + if (cs_etm_evsel) {
    + /*
    + * To obtain the auxtrace buffer file descriptor, the auxtrace
    + * event must come first.
    + */
    + perf_evlist__to_front(evlist, cs_etm_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(cs_etm_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);
    + }
    +
    + return 0;
    +}
    +
    +static size_t
    +cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
    + struct perf_session *session __maybe_unused)
    +{
    + int records;
    + const struct cpu_map *cpus = session->evlist->cpus;
    +
    + if (!cpu_map__empty(cpus)) {
    + records = cpu_map__nr(cpus);
    + goto out;
    + }
    +
    + set_max_cpu_num();
    + records = cpu__max_cpu();
    +out:
    + return records * CS_ETM_PRIV_SIZE;
    +}
    +
    +static const char *metadata[CS_ETM_PRIV_MAX] = {
    + [CS_ETM_ETMCR] = "etmcr",
    + [CS_ETM_ETMCCER] = "etmccer",
    + [CS_ETM_ETMIDR] = "etmidr",
    + [CS_ETM_ETMTRACEIDR] = "etmtraceidr",
    +};
    +
    +static int cs_etm_get_metadata(int cpu, int offset,
    + struct cs_etm_recording *ptr,
    + struct auxtrace_info_event *info)
    +{
    + int i, ret = 0;
    + const char *sysfs = sysfs__mountpoint();
    +
    + if (!sysfs)
    + return -EINVAL;
    +
    + info->priv[offset + CS_ETM_MAGIC] = __perf_cs_etm_magic;
    + info->priv[offset + CS_ETM_CPU] = cpu;
    + info->priv[offset + CS_ETM_SNAPSHOT] = ptr->snapshot_mode;
    +
    + /* get metadata from sysfs */
    + for (i = CS_ETM_ETMCR; i < CS_ETM_PRIV_MAX && !ret; i++) {
    + FILE *file;
    + char path[PATH_MAX], value[128];
    +
    + snprintf(path, PATH_MAX,
    + "%s" EVENT_SOURCE_DEVICE_PATH "%s/cpu%d/mgmt/%s",
    + sysfs, CORESIGHT_ETM_PMU_NAME, cpu, metadata[i]);
    +
    + file = fopen(path, "r");
    + if (!file)
    + return -EINVAL;
    +
    + if (fscanf(file, "%s", value) != 1)
    + ret = -EINVAL;
    +
    + fclose(file);
    +
    + info->priv[offset + i] = strtol(value, NULL, 16);
    + }
    +
    + return 0;
    +}
    +
    +static int cs_etm_info_fill(struct auxtrace_record *itr,
    + struct perf_session *session,
    + struct auxtrace_info_event *auxtrace_info,
    + size_t priv_size)
    +{
    + int i, nr_cpu, ret = 0;
    + const struct cpu_map *cpus = session->evlist->cpus;
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    +
    + if (priv_size != cs_etm_info_priv_size(itr, session))
    + return -EINVAL;
    +
    + if (!session->evlist->nr_mmaps)
    + return -EINVAL;
    +
    + auxtrace_info->type = PERF_AUXTRACE_CS_ETM;
    +
    + /* cpu map is not empty, we have specific CPUs to work with */
    + if (!cpu_map__empty(cpus)) {
    + for (i = 0; i < cpu_map__nr(cpus); i++)
    + ret = cs_etm_get_metadata(cpus->map[i],
    + i * CS_ETM_PRIV_MAX,
    + ptr, auxtrace_info);
    + if (ret)
    + goto out;
    + }
    +
    + /* get configuration for all CPUs in the system */
    + nr_cpu = cpu__max_cpu();
    + for (i = 0; i < nr_cpu; i++) {
    + ret = cs_etm_get_metadata(i, i * CS_ETM_PRIV_MAX,
    + ptr, auxtrace_info);
    + if (ret)
    + goto out;
    + }
    +
    +out:
    + return ret;
    +}
    +
    +static int cs_etm_find_snapshot(struct auxtrace_record *itr __maybe_unused,
    + int idx, struct auxtrace_mmap *mm,
    + unsigned char *data __maybe_unused,
    + u64 *head, u64 *old)
    +{
    + pr_debug3("%s: mmap index %d old head %zu new head %zu size %zu\n",
    + __func__, idx, (size_t)*old, (size_t)*head, mm->len);
    +
    + *old = *head;
    + *head += mm->len;
    +
    + return 0;
    +}
    +
    +static int cs_etm_snapshot_start(struct auxtrace_record *itr)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    + struct perf_evsel *evsel;
    +
    + evlist__for_each(ptr->evlist, evsel) {
    + if (evsel->attr.type == ptr->cs_etm_pmu->type)
    + return perf_evlist__disable_event(ptr->evlist, evsel);
    + }
    + return -EINVAL;
    +}
    +
    +static int cs_etm_snapshot_finish(struct auxtrace_record *itr)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    + struct perf_evsel *evsel;
    +
    + evlist__for_each(ptr->evlist, evsel) {
    + if (evsel->attr.type == ptr->cs_etm_pmu->type)
    + return perf_evlist__enable_event(ptr->evlist, evsel);
    + }
    + return -EINVAL;
    +}
    +
    +static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused)
    +{
    + return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) |
    + (((u64) rand() << 32) & 0xFFFFFFFF00000000ull);
    +}
    +
    +static void cs_etm_recording_free(struct auxtrace_record *itr)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    + free(ptr);
    +}
    +
    +static int cs_etm_read_finish(struct auxtrace_record *itr, int idx)
    +{
    + struct cs_etm_recording *ptr =
    + container_of(itr, struct cs_etm_recording, itr);
    + struct perf_evsel *evsel;
    +
    + evlist__for_each(ptr->evlist, evsel) {
    + if (evsel->attr.type == ptr->cs_etm_pmu->type)
    + return perf_evlist__enable_event_idx(ptr->evlist,
    + evsel, idx);
    + }
    +
    + return -EINVAL;
    +}
    +
    +struct auxtrace_record *cs_etm_record_init(int *err)
    +{
    + struct perf_pmu *cs_etm_pmu;
    + struct cs_etm_recording *ptr;
    +
    + cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
    +
    + if (!cs_etm_pmu) {
    + *err = -EINVAL;
    + goto out;
    + }
    +
    + ptr = zalloc(sizeof(struct cs_etm_recording));
    + if (!ptr) {
    + *err = -ENOMEM;
    + goto out;
    + }
    +
    + ptr->cs_etm_pmu = cs_etm_pmu;
    + ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options;
    + ptr->itr.recording_options = cs_etm_recording_options;
    + ptr->itr.info_priv_size = cs_etm_info_priv_size;
    + ptr->itr.info_fill = cs_etm_info_fill;
    + ptr->itr.find_snapshot = cs_etm_find_snapshot;
    + ptr->itr.snapshot_start = cs_etm_snapshot_start;
    + ptr->itr.snapshot_finish = cs_etm_snapshot_finish;
    + ptr->itr.reference = cs_etm_reference;
    + ptr->itr.free = cs_etm_recording_free;
    + ptr->itr.read_finish = cs_etm_read_finish;
    +
    + *err = 0;
    + return &ptr->itr;
    +out:
    + return NULL;
    +}
    diff --git a/tools/perf/arch/arm/util/cs_etm.h b/tools/perf/arch/arm/util/cs_etm.h
    new file mode 100644
    index 000000000000..b3b3f16d80e3
    --- /dev/null
    +++ b/tools/perf/arch/arm/util/cs_etm.h
    @@ -0,0 +1,37 @@
    +/*
    + * Copyright(C) 2015 Linaro Limited. All rights reserved.
    + * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License version 2 as published by
    + * the Free Software Foundation.
    + *
    + * This program is distributed in the hope that 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.
    + *
    + * You should have received a copy of the GNU General Public License along with
    + * this program. If not, see <http://www.gnu.org/licenses/>.
    + */
    +
    +#ifndef INCLUDE__PERF_CS_ETM_H__
    +#define INCLUDE__PERF_CS_ETM_H__
    +
    +enum {
    + CS_ETM_MAGIC,
    + CS_ETM_CPU,
    + CS_ETM_SNAPSHOT,
    + CS_ETM_ETMCR,
    + CS_ETM_ETMCCER,
    + CS_ETM_ETMIDR,
    + CS_ETM_ETMTRACEIDR,
    + CS_ETM_PRIV_MAX,
    +};
    +
    +static const u64 __perf_cs_etm_magic = 0x3030303030303030ULL;
    +#define CS_ETM_PRIV_SIZE (CS_ETM_PRIV_MAX * sizeof(u64))
    +
    +struct auxtrace_record *cs_etm_record_init(int *err);
    +
    +#endif
    --
    1.9.1


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