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449 lines
12 KiB
449 lines
12 KiB
// 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.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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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_events(evlist, "dummy:u", NULL); |
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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++) { |
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if (data[i]) |
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return true; |
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} |
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return false; |
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} |
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static int intel_bts_find_snapshot(struct auxtrace_record *itr, int idx, |
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struct auxtrace_mmap *mm, unsigned char *data, |
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u64 *head, u64 *old) |
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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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bool wrapped; |
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int err; |
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pr_debug3("%s: mmap index %d old head %zu new head %zu\n", |
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__func__, idx, (size_t)*old, (size_t)*head); |
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if (idx >= btsr->snapshot_ref_cnt) { |
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err = intel_bts_alloc_snapshot_refs(btsr, idx); |
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if (err) |
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goto out_err; |
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} |
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wrapped = btsr->snapshot_refs[idx].wrapped; |
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if (!wrapped && intel_bts_first_wrap((u64 *)data, mm->len)) { |
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btsr->snapshot_refs[idx].wrapped = true; |
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wrapped = true; |
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} |
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/* |
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* In full trace mode 'head' continually increases. However in snapshot |
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* mode 'head' is an offset within the buffer. Here 'old' and 'head' |
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* are adjusted to match the full trace case which expects that 'old' is |
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* always less than 'head'. |
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*/ |
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if (wrapped) { |
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*old = *head; |
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*head += mm->len; |
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} else { |
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if (mm->mask) |
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*old &= mm->mask; |
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else |
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*old %= mm->len; |
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if (*old > *head) |
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*head += mm->len; |
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} |
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pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n", |
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__func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head); |
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return 0; |
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out_err: |
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pr_err("%s: failed, error %d\n", __func__, err); |
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return err; |
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} |
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struct auxtrace_record *intel_bts_recording_init(int *err) |
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{ |
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struct perf_pmu *intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME); |
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struct intel_bts_recording *btsr; |
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if (!intel_bts_pmu) |
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return NULL; |
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if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) { |
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*err = -errno; |
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return NULL; |
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} |
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btsr = zalloc(sizeof(struct intel_bts_recording)); |
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if (!btsr) { |
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*err = -ENOMEM; |
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return NULL; |
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} |
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btsr->intel_bts_pmu = intel_bts_pmu; |
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btsr->itr.pmu = intel_bts_pmu; |
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btsr->itr.recording_options = intel_bts_recording_options; |
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btsr->itr.info_priv_size = intel_bts_info_priv_size; |
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btsr->itr.info_fill = intel_bts_info_fill; |
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btsr->itr.free = intel_bts_recording_free; |
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btsr->itr.snapshot_start = intel_bts_snapshot_start; |
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btsr->itr.snapshot_finish = intel_bts_snapshot_finish; |
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btsr->itr.find_snapshot = intel_bts_find_snapshot; |
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btsr->itr.parse_snapshot_options = intel_bts_parse_snapshot_options; |
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btsr->itr.reference = intel_bts_reference; |
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btsr->itr.read_finish = auxtrace_record__read_finish; |
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btsr->itr.alignment = sizeof(struct branch); |
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return &btsr->itr; |
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}
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