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|
/*
* intel-bts.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 <errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include "../../util/cpumap.h"
#include "../../util/evsel.h"
#include "../../util/evlist.h"
#include "../../util/session.h"
#include "../../util/util.h"
#include "../../util/pmu.h"
#include "../../util/debug.h"
#include "../../util/tsc.h"
#include "../../util/auxtrace.h"
#include "../../util/intel-bts.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)
struct intel_bts_snapshot_ref {
void *ref_buf;
size_t ref_offset;
bool wrapped;
};
struct intel_bts_recording {
struct auxtrace_record itr;
struct perf_pmu *intel_bts_pmu;
struct perf_evlist *evlist;
bool snapshot_mode;
size_t snapshot_size;
int snapshot_ref_cnt;
struct intel_bts_snapshot_ref *snapshot_refs;
};
struct branch {
u64 from;
u64 to;
u64 misc;
};
static size_t
intel_bts_info_priv_size(struct auxtrace_record *itr __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
return INTEL_BTS_AUXTRACE_PRIV_SIZE;
}
static int intel_bts_info_fill(struct auxtrace_record *itr,
struct perf_session *session,
struct auxtrace_info_event *auxtrace_info,
size_t priv_size)
{
struct intel_bts_recording *btsr =
container_of(itr, struct intel_bts_recording, itr);
struct perf_pmu *intel_bts_pmu = btsr->intel_bts_pmu;
struct perf_event_mmap_page *pc;
struct perf_tsc_conversion tc = { .time_mult = 0, };
bool cap_user_time_zero = false;
int err;
if (priv_size != INTEL_BTS_AUXTRACE_PRIV_SIZE)
return -EINVAL;
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 BTS: TSC not available\n");
}
auxtrace_info->type = PERF_AUXTRACE_INTEL_BTS;
auxtrace_info->priv[INTEL_BTS_PMU_TYPE] = intel_bts_pmu->type;
auxtrace_info->priv[INTEL_BTS_TIME_SHIFT] = tc.time_shift;
auxtrace_info->priv[INTEL_BTS_TIME_MULT] = tc.time_mult;
auxtrace_info->priv[INTEL_BTS_TIME_ZERO] = tc.time_zero;
auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO] = cap_user_time_zero;
auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE] = btsr->snapshot_mode;
return 0;
}
static int intel_bts_recording_options(struct auxtrace_record *itr,
struct perf_evlist *evlist,
struct record_opts *opts)
{
struct intel_bts_recording *btsr =
container_of(itr, struct intel_bts_recording, itr);
struct perf_pmu *intel_bts_pmu = btsr->intel_bts_pmu;
struct perf_evsel *evsel, *intel_bts_evsel = NULL;
const struct cpu_map *cpus = evlist->cpus;
bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
btsr->evlist = evlist;
btsr->snapshot_mode = opts->auxtrace_snapshot_mode;
evlist__for_each_entry(evlist, evsel) {
if (evsel->attr.type == intel_bts_pmu->type) {
if (intel_bts_evsel) {
pr_err("There may be only one " INTEL_BTS_PMU_NAME " event\n");
return -EINVAL;
}
evsel->attr.freq = 0;
evsel->attr.sample_period = 1;
intel_bts_evsel = evsel;
opts->full_auxtrace = true;
}
}
if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
pr_err("Snapshot mode (-S option) requires " INTEL_BTS_PMU_NAME " PMU event (-e " INTEL_BTS_PMU_NAME ")\n");
return -EINVAL;
}
if (!opts->full_auxtrace)
return 0;
if (opts->full_auxtrace && !cpu_map__empty(cpus)) {
pr_err(INTEL_BTS_PMU_NAME " does not support per-cpu recording\n");
return -EINVAL;
}
/* Set default sizes for snapshot mode */
if (opts->auxtrace_snapshot_mode) {
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 BTS snapshot size: %zu\n",
opts->auxtrace_snapshot_size);
}
/* 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 BTS: must be at least %zuKiB and a power of 2\n",
min_sz / 1024);
return -EINVAL;
}
}
if (intel_bts_evsel) {
/*
* To obtain the auxtrace buffer file descriptor, the auxtrace event
* must come first.
*/
perf_evlist__to_front(evlist, intel_bts_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_bts_evsel, CPU);
}
/* Add dummy event to keep tracking */
|