451 lines
12 KiB
C
451 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* intel-bts.c: Intel Processor Trace support
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* Copyright (c) 2013-2015, Intel Corporation.
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*/
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#include <errno.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/log2.h>
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#include <linux/zalloc.h>
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#include "../../../util/cpumap.h"
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#include "../../../util/event.h"
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#include "../../../util/evsel.h"
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#include "../../../util/evlist.h"
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#include "../../../util/mmap.h"
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#include "../../../util/session.h"
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#include "../../../util/pmu.h"
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#include "../../../util/debug.h"
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#include "../../../util/record.h"
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#include "../../../util/tsc.h"
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#include "../../../util/auxtrace.h"
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#include "../../../util/intel-bts.h"
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#include <internal/lib.h> // page_size
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#define KiB(x) ((x) * 1024)
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#define MiB(x) ((x) * 1024 * 1024)
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#define KiB_MASK(x) (KiB(x) - 1)
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#define MiB_MASK(x) (MiB(x) - 1)
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struct intel_bts_snapshot_ref {
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void *ref_buf;
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size_t ref_offset;
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bool wrapped;
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};
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struct intel_bts_recording {
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struct auxtrace_record itr;
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struct perf_pmu *intel_bts_pmu;
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struct evlist *evlist;
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bool snapshot_mode;
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size_t snapshot_size;
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int snapshot_ref_cnt;
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struct intel_bts_snapshot_ref *snapshot_refs;
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};
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struct branch {
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u64 from;
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u64 to;
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u64 misc;
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};
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static size_t
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intel_bts_info_priv_size(struct auxtrace_record *itr __maybe_unused,
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struct evlist *evlist __maybe_unused)
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{
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return INTEL_BTS_AUXTRACE_PRIV_SIZE;
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}
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static int intel_bts_info_fill(struct auxtrace_record *itr,
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struct perf_session *session,
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struct perf_record_auxtrace_info *auxtrace_info,
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size_t priv_size)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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struct perf_pmu *intel_bts_pmu = btsr->intel_bts_pmu;
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struct perf_event_mmap_page *pc;
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struct perf_tsc_conversion tc = { .time_mult = 0, };
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bool cap_user_time_zero = false;
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int err;
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if (priv_size != INTEL_BTS_AUXTRACE_PRIV_SIZE)
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return -EINVAL;
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if (!session->evlist->core.nr_mmaps)
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return -EINVAL;
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pc = session->evlist->mmap[0].core.base;
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if (pc) {
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err = perf_read_tsc_conversion(pc, &tc);
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if (err) {
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if (err != -EOPNOTSUPP)
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return err;
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} else {
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cap_user_time_zero = tc.time_mult != 0;
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}
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if (!cap_user_time_zero)
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ui__warning("Intel BTS: TSC not available\n");
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}
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auxtrace_info->type = PERF_AUXTRACE_INTEL_BTS;
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auxtrace_info->priv[INTEL_BTS_PMU_TYPE] = intel_bts_pmu->type;
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auxtrace_info->priv[INTEL_BTS_TIME_SHIFT] = tc.time_shift;
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auxtrace_info->priv[INTEL_BTS_TIME_MULT] = tc.time_mult;
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auxtrace_info->priv[INTEL_BTS_TIME_ZERO] = tc.time_zero;
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auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO] = cap_user_time_zero;
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auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE] = btsr->snapshot_mode;
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return 0;
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}
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static int intel_bts_recording_options(struct auxtrace_record *itr,
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struct evlist *evlist,
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struct record_opts *opts)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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struct perf_pmu *intel_bts_pmu = btsr->intel_bts_pmu;
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struct evsel *evsel, *intel_bts_evsel = NULL;
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const struct perf_cpu_map *cpus = evlist->core.user_requested_cpus;
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bool privileged = perf_event_paranoid_check(-1);
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if (opts->auxtrace_sample_mode) {
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pr_err("Intel BTS does not support AUX area sampling\n");
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return -EINVAL;
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}
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btsr->evlist = evlist;
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btsr->snapshot_mode = opts->auxtrace_snapshot_mode;
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evlist__for_each_entry(evlist, evsel) {
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if (evsel->core.attr.type == intel_bts_pmu->type) {
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if (intel_bts_evsel) {
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pr_err("There may be only one " INTEL_BTS_PMU_NAME " event\n");
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return -EINVAL;
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}
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evsel->core.attr.freq = 0;
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evsel->core.attr.sample_period = 1;
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evsel->needs_auxtrace_mmap = true;
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intel_bts_evsel = evsel;
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opts->full_auxtrace = true;
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}
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}
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if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
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pr_err("Snapshot mode (-S option) requires " INTEL_BTS_PMU_NAME " PMU event (-e " INTEL_BTS_PMU_NAME ")\n");
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return -EINVAL;
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}
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if (!opts->full_auxtrace)
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return 0;
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if (opts->full_auxtrace && !perf_cpu_map__empty(cpus)) {
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pr_err(INTEL_BTS_PMU_NAME " does not support per-cpu recording\n");
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return -EINVAL;
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}
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/* Set default sizes for snapshot mode */
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if (opts->auxtrace_snapshot_mode) {
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if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
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if (privileged) {
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opts->auxtrace_mmap_pages = MiB(4) / page_size;
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} else {
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opts->auxtrace_mmap_pages = KiB(128) / page_size;
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if (opts->mmap_pages == UINT_MAX)
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opts->mmap_pages = KiB(256) / page_size;
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}
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} else if (!opts->auxtrace_mmap_pages && !privileged &&
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opts->mmap_pages == UINT_MAX) {
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opts->mmap_pages = KiB(256) / page_size;
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}
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if (!opts->auxtrace_snapshot_size)
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opts->auxtrace_snapshot_size =
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opts->auxtrace_mmap_pages * (size_t)page_size;
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if (!opts->auxtrace_mmap_pages) {
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size_t sz = opts->auxtrace_snapshot_size;
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sz = round_up(sz, page_size) / page_size;
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opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
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}
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if (opts->auxtrace_snapshot_size >
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opts->auxtrace_mmap_pages * (size_t)page_size) {
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pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
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opts->auxtrace_snapshot_size,
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opts->auxtrace_mmap_pages * (size_t)page_size);
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return -EINVAL;
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}
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if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
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pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
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return -EINVAL;
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}
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pr_debug2("Intel BTS snapshot size: %zu\n",
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opts->auxtrace_snapshot_size);
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}
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/* Set default sizes for full trace mode */
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if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
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if (privileged) {
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opts->auxtrace_mmap_pages = MiB(4) / page_size;
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} else {
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opts->auxtrace_mmap_pages = KiB(128) / page_size;
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if (opts->mmap_pages == UINT_MAX)
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opts->mmap_pages = KiB(256) / page_size;
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}
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}
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/* Validate auxtrace_mmap_pages */
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if (opts->auxtrace_mmap_pages) {
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size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
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size_t min_sz;
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if (opts->auxtrace_snapshot_mode)
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min_sz = KiB(4);
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else
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min_sz = KiB(8);
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if (sz < min_sz || !is_power_of_2(sz)) {
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pr_err("Invalid mmap size for Intel BTS: must be at least %zuKiB and a power of 2\n",
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min_sz / 1024);
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return -EINVAL;
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}
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}
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if (intel_bts_evsel) {
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/*
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* To obtain the auxtrace buffer file descriptor, the auxtrace event
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* must come first.
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*/
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evlist__to_front(evlist, intel_bts_evsel);
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/*
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* In the case of per-cpu mmaps, we need the CPU on the
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* AUX event.
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*/
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if (!perf_cpu_map__empty(cpus))
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evsel__set_sample_bit(intel_bts_evsel, CPU);
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}
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/* Add dummy event to keep tracking */
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if (opts->full_auxtrace) {
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struct evsel *tracking_evsel;
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int err;
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err = parse_event(evlist, "dummy:u");
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if (err)
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return err;
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tracking_evsel = evlist__last(evlist);
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evlist__set_tracking_event(evlist, tracking_evsel);
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tracking_evsel->core.attr.freq = 0;
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tracking_evsel->core.attr.sample_period = 1;
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}
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return 0;
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}
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static int intel_bts_parse_snapshot_options(struct auxtrace_record *itr,
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struct record_opts *opts,
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const char *str)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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unsigned long long snapshot_size = 0;
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char *endptr;
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if (str) {
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snapshot_size = strtoull(str, &endptr, 0);
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if (*endptr || snapshot_size > SIZE_MAX)
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return -1;
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}
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opts->auxtrace_snapshot_mode = true;
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opts->auxtrace_snapshot_size = snapshot_size;
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btsr->snapshot_size = snapshot_size;
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return 0;
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}
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static u64 intel_bts_reference(struct auxtrace_record *itr __maybe_unused)
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{
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return rdtsc();
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}
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static int intel_bts_alloc_snapshot_refs(struct intel_bts_recording *btsr,
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int idx)
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{
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const size_t sz = sizeof(struct intel_bts_snapshot_ref);
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int cnt = btsr->snapshot_ref_cnt, new_cnt = cnt * 2;
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struct intel_bts_snapshot_ref *refs;
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if (!new_cnt)
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new_cnt = 16;
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while (new_cnt <= idx)
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new_cnt *= 2;
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refs = calloc(new_cnt, sz);
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if (!refs)
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return -ENOMEM;
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memcpy(refs, btsr->snapshot_refs, cnt * sz);
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btsr->snapshot_refs = refs;
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btsr->snapshot_ref_cnt = new_cnt;
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return 0;
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}
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static void intel_bts_free_snapshot_refs(struct intel_bts_recording *btsr)
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{
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int i;
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for (i = 0; i < btsr->snapshot_ref_cnt; i++)
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zfree(&btsr->snapshot_refs[i].ref_buf);
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zfree(&btsr->snapshot_refs);
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}
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static void intel_bts_recording_free(struct auxtrace_record *itr)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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intel_bts_free_snapshot_refs(btsr);
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free(btsr);
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}
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static int intel_bts_snapshot_start(struct auxtrace_record *itr)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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struct evsel *evsel;
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evlist__for_each_entry(btsr->evlist, evsel) {
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if (evsel->core.attr.type == btsr->intel_bts_pmu->type)
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return evsel__disable(evsel);
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}
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return -EINVAL;
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}
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static int intel_bts_snapshot_finish(struct auxtrace_record *itr)
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{
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struct intel_bts_recording *btsr =
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container_of(itr, struct intel_bts_recording, itr);
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struct evsel *evsel;
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evlist__for_each_entry(btsr->evlist, evsel) {
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if (evsel->core.attr.type == btsr->intel_bts_pmu->type)
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return evsel__enable(evsel);
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}
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return -EINVAL;
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}
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static bool intel_bts_first_wrap(u64 *data, size_t buf_size)
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{
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int i, a, b;
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b = buf_size >> 3;
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a = b - 512;
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if (a < 0)
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a = 0;
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|
|
for (i = a; i < b; i++) {
|
||
|
|
if (data[i])
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int intel_bts_find_snapshot(struct auxtrace_record *itr, int idx,
|
||
|
|
struct auxtrace_mmap *mm, unsigned char *data,
|
||
|
|
u64 *head, u64 *old)
|
||
|
|
{
|
||
|
|
struct intel_bts_recording *btsr =
|
||
|
|
container_of(itr, struct intel_bts_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);
|
||
|
|
|
||
|
|
if (idx >= btsr->snapshot_ref_cnt) {
|
||
|
|
err = intel_bts_alloc_snapshot_refs(btsr, idx);
|
||
|
|
if (err)
|
||
|
|
goto out_err;
|
||
|
|
}
|
||
|
|
|
||
|
|
wrapped = btsr->snapshot_refs[idx].wrapped;
|
||
|
|
if (!wrapped && intel_bts_first_wrap((u64 *)data, mm->len)) {
|
||
|
|
btsr->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;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct auxtrace_record *intel_bts_recording_init(int *err)
|
||
|
|
{
|
||
|
|
struct perf_pmu *intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
|
||
|
|
struct intel_bts_recording *btsr;
|
||
|
|
|
||
|
|
if (!intel_bts_pmu)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) {
|
||
|
|
*err = -errno;
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
btsr = zalloc(sizeof(struct intel_bts_recording));
|
||
|
|
if (!btsr) {
|
||
|
|
*err = -ENOMEM;
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
btsr->intel_bts_pmu = intel_bts_pmu;
|
||
|
|
btsr->itr.pmu = intel_bts_pmu;
|
||
|
|
btsr->itr.recording_options = intel_bts_recording_options;
|
||
|
|
btsr->itr.info_priv_size = intel_bts_info_priv_size;
|
||
|
|
btsr->itr.info_fill = intel_bts_info_fill;
|
||
|
|
btsr->itr.free = intel_bts_recording_free;
|
||
|
|
btsr->itr.snapshot_start = intel_bts_snapshot_start;
|
||
|
|
btsr->itr.snapshot_finish = intel_bts_snapshot_finish;
|
||
|
|
btsr->itr.find_snapshot = intel_bts_find_snapshot;
|
||
|
|
btsr->itr.parse_snapshot_options = intel_bts_parse_snapshot_options;
|
||
|
|
btsr->itr.reference = intel_bts_reference;
|
||
|
|
btsr->itr.read_finish = auxtrace_record__read_finish;
|
||
|
|
btsr->itr.alignment = sizeof(struct branch);
|
||
|
|
return &btsr->itr;
|
||
|
|
}
|