linux/tools/perf/util/intel-bts.c
Andi Kleen faaa87680b perf intel-pt/bts: Report instruction bytes and length in sample
Change Intel PT and BTS to pass up the length and the instruction
bytes of the decoded or sampled instruction in the perf sample.

The decoder already knows this information, we just need to pass it
up. Since it is only a couple of movs it is not very expensive.

Handle instruction cache too. Make sure ilen is always initialized.

Used in the next patch.

[Adrian: re-base on top (and adjust for) instruction buffer size tidy-up]
[Adrian: add BTS support and adjust commit message accordingly]

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: http://lkml.kernel.org/r/1475847747-30994-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-10-24 10:31:32 -03:00

951 lines
23 KiB
C

/*
* 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 <endian.h>
#include <byteswap.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include "cpumap.h"
#include "color.h"
#include "evsel.h"
#include "evlist.h"
#include "machine.h"
#include "session.h"
#include "util.h"
#include "thread.h"
#include "thread-stack.h"
#include "debug.h"
#include "tsc.h"
#include "auxtrace.h"
#include "intel-pt-decoder/intel-pt-insn-decoder.h"
#include "intel-bts.h"
#define MAX_TIMESTAMP (~0ULL)
#define INTEL_BTS_ERR_NOINSN 5
#define INTEL_BTS_ERR_LOST 9
#if __BYTE_ORDER == __BIG_ENDIAN
#define le64_to_cpu bswap_64
#else
#define le64_to_cpu
#endif
struct intel_bts {
struct auxtrace auxtrace;
struct auxtrace_queues queues;
struct auxtrace_heap heap;
u32 auxtrace_type;
struct perf_session *session;
struct machine *machine;
bool sampling_mode;
bool snapshot_mode;
bool data_queued;
u32 pmu_type;
struct perf_tsc_conversion tc;
bool cap_user_time_zero;
struct itrace_synth_opts synth_opts;
bool sample_branches;
u32 branches_filter;
u64 branches_sample_type;
u64 branches_id;
size_t branches_event_size;
bool synth_needs_swap;
unsigned long num_events;
};
struct intel_bts_queue {
struct intel_bts *bts;
unsigned int queue_nr;
struct auxtrace_buffer *buffer;
bool on_heap;
bool done;
pid_t pid;
pid_t tid;
int cpu;
u64 time;
struct intel_pt_insn intel_pt_insn;
u32 sample_flags;
};
struct branch {
u64 from;
u64 to;
u64 misc;
};
static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
unsigned char *buf, size_t len)
{
struct branch *branch;
size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
const char *color = PERF_COLOR_BLUE;
color_fprintf(stdout, color,
". ... Intel BTS data: size %zu bytes\n",
len);
while (len) {
if (len >= br_sz)
sz = br_sz;
else
sz = len;
printf(".");
color_fprintf(stdout, color, " %08x: ", pos);
for (i = 0; i < sz; i++)
color_fprintf(stdout, color, " %02x", buf[i]);
for (; i < br_sz; i++)
color_fprintf(stdout, color, " ");
if (len >= br_sz) {
branch = (struct branch *)buf;
color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
le64_to_cpu(branch->from),
le64_to_cpu(branch->to),
le64_to_cpu(branch->misc) & 0x10 ?
"pred" : "miss");
} else {
color_fprintf(stdout, color, " Bad record!\n");
}
pos += sz;
buf += sz;
len -= sz;
}
}
static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
size_t len)
{
printf(".\n");
intel_bts_dump(bts, buf, len);
}
static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
{
union perf_event event;
int err;
auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
sample->tid, 0, "Lost trace data");
err = perf_session__deliver_synth_event(bts->session, &event, NULL);
if (err)
pr_err("Intel BTS: failed to deliver error event, error %d\n",
err);
return err;
}
static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
unsigned int queue_nr)
{
struct intel_bts_queue *btsq;
btsq = zalloc(sizeof(struct intel_bts_queue));
if (!btsq)
return NULL;
btsq->bts = bts;
btsq->queue_nr = queue_nr;
btsq->pid = -1;
btsq->tid = -1;
btsq->cpu = -1;
return btsq;
}
static int intel_bts_setup_queue(struct intel_bts *bts,
struct auxtrace_queue *queue,
unsigned int queue_nr)
{
struct intel_bts_queue *btsq = queue->priv;
if (list_empty(&queue->head))
return 0;
if (!btsq) {
btsq = intel_bts_alloc_queue(bts, queue_nr);
if (!btsq)
return -ENOMEM;
queue->priv = btsq;
if (queue->cpu != -1)
btsq->cpu = queue->cpu;
btsq->tid = queue->tid;
}
if (bts->sampling_mode)
return 0;
if (!btsq->on_heap && !btsq->buffer) {
int ret;
btsq->buffer = auxtrace_buffer__next(queue, NULL);
if (!btsq->buffer)
return 0;
ret = auxtrace_heap__add(&bts->heap, queue_nr,
btsq->buffer->reference);
if (ret)
return ret;
btsq->on_heap = true;
}
return 0;
}
static int intel_bts_setup_queues(struct intel_bts *bts)
{
unsigned int i;
int ret;
for (i = 0; i < bts->queues.nr_queues; i++) {
ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
i);
if (ret)
return ret;
}
return 0;
}
static inline int intel_bts_update_queues(struct intel_bts *bts)
{
if (bts->queues.new_data) {
bts->queues.new_data = false;
return intel_bts_setup_queues(bts);
}
return 0;
}
static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
unsigned char *buf_b, size_t len_b)
{
size_t offs, len;
if (len_a > len_b)
offs = len_a - len_b;
else
offs = 0;
for (; offs < len_a; offs += sizeof(struct branch)) {
len = len_a - offs;
if (!memcmp(buf_a + offs, buf_b, len))
return buf_b + len;
}
return buf_b;
}
static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
struct auxtrace_buffer *b)
{
struct auxtrace_buffer *a;
void *start;
if (b->list.prev == &queue->head)
return 0;
a = list_entry(b->list.prev, struct auxtrace_buffer, list);
start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
if (!start)
return -EINVAL;
b->use_size = b->data + b->size - start;
b->use_data = start;
return 0;
}
static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
struct branch *branch)
{
int ret;
struct intel_bts *bts = btsq->bts;
union perf_event event;
struct perf_sample sample = { .ip = 0, };
if (bts->synth_opts.initial_skip &&
bts->num_events++ <= bts->synth_opts.initial_skip)
return 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);
sample.cpumode = PERF_RECORD_MISC_USER;
sample.ip = le64_to_cpu(branch->from);
sample.pid = btsq->pid;
sample.tid = btsq->tid;
sample.addr = le64_to_cpu(branch->to);
sample.id = btsq->bts->branches_id;
sample.stream_id = btsq->bts->branches_id;
sample.period = 1;
sample.cpu = btsq->cpu;
sample.flags = btsq->sample_flags;
sample.insn_len = btsq->intel_pt_insn.length;
memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
if (bts->synth_opts.inject) {
event.sample.header.size = bts->branches_event_size;
ret = perf_event__synthesize_sample(&event,
bts->branches_sample_type,
0, &sample,
bts->synth_needs_swap);
if (ret)
return ret;
}
ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
if (ret)
pr_err("Intel BTS: failed to deliver branch event, error %d\n",
ret);
return ret;
}
static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
{
struct machine *machine = btsq->bts->machine;
struct thread *thread;
struct addr_location al;
unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
uint8_t cpumode;
int err = -1;
if (machine__kernel_ip(machine, ip))
cpumode = PERF_RECORD_MISC_KERNEL;
else
cpumode = PERF_RECORD_MISC_USER;
thread = machine__find_thread(machine, -1, btsq->tid);
if (!thread)
return -1;
thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
if (!al.map || !al.map->dso)
goto out_put;
len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
goto out_put;
/* Load maps to ensure dso->is_64_bit has been updated */
map__load(al.map);
x86_64 = al.map->dso->is_64_bit;
if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
goto out_put;
err = 0;
out_put:
thread__put(thread);
return err;
}
static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
pid_t tid, u64 ip)
{
union perf_event event;
int err;
auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
"Failed to get instruction");
err = perf_session__deliver_synth_event(bts->session, &event, NULL);
if (err)
pr_err("Intel BTS: failed to deliver error event, error %d\n",
err);
return err;
}
static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
struct branch *branch)
{
int err;
if (!branch->from) {
if (branch->to)
btsq->sample_flags = PERF_IP_FLAG_BRANCH |
PERF_IP_FLAG_TRACE_BEGIN;
else
btsq->sample_flags = 0;
btsq->intel_pt_insn.length = 0;
} else if (!branch->to) {
btsq->sample_flags = PERF_IP_FLAG_BRANCH |
PERF_IP_FLAG_TRACE_END;
btsq->intel_pt_insn.length = 0;
} else {
err = intel_bts_get_next_insn(btsq, branch->from);
if (err) {
btsq->sample_flags = 0;
btsq->intel_pt_insn.length = 0;
if (!btsq->bts->synth_opts.errors)
return 0;
err = intel_bts_synth_error(btsq->bts, btsq->cpu,
btsq->pid, btsq->tid,
branch->from);
return err;
}
btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
/* Check for an async branch into the kernel */
if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
machine__kernel_ip(btsq->bts->machine, branch->to) &&
btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
PERF_IP_FLAG_CALL |
PERF_IP_FLAG_SYSCALLRET))
btsq->sample_flags = PERF_IP_FLAG_BRANCH |
PERF_IP_FLAG_CALL |
PERF_IP_FLAG_ASYNC |
PERF_IP_FLAG_INTERRUPT;
}
return 0;
}
static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
struct auxtrace_buffer *buffer,
struct thread *thread)
{
struct branch *branch;
size_t sz, bsz = sizeof(struct branch);
u32 filter = btsq->bts->branches_filter;
int err = 0;
if (buffer->use_data) {
sz = buffer->use_size;
branch = buffer->use_data;
} else {
sz = buffer->size;
branch = buffer->data;
}
if (!btsq->bts->sample_branches)
return 0;
for (; sz > bsz; branch += 1, sz -= bsz) {
if (!branch->from && !branch->to)
continue;
intel_bts_get_branch_type(btsq, branch);
if (btsq->bts->synth_opts.thread_stack)
thread_stack__event(thread, btsq->sample_flags,
le64_to_cpu(branch->from),
le64_to_cpu(branch->to),
btsq->intel_pt_insn.length,
buffer->buffer_nr + 1);
if (filter && !(filter & btsq->sample_flags))
continue;
err = intel_bts_synth_branch_sample(btsq, branch);
if (err)
break;
}
return err;
}
static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
{
struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
struct auxtrace_queue *queue;
struct thread *thread;
int err;
if (btsq->done)
return 1;
if (btsq->pid == -1) {
thread = machine__find_thread(btsq->bts->machine, -1,
btsq->tid);
if (thread)
btsq->pid = thread->pid_;
} else {
thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
btsq->tid);
}
queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
if (!buffer)
buffer = auxtrace_buffer__next(queue, NULL);
if (!buffer) {
if (!btsq->bts->sampling_mode)
btsq->done = 1;
err = 1;
goto out_put;
}
/* Currently there is no support for split buffers */
if (buffer->consecutive) {
err = -EINVAL;
goto out_put;
}
if (!buffer->data) {
int fd = perf_data_file__fd(btsq->bts->session->file);
buffer->data = auxtrace_buffer__get_data(buffer, fd);
if (!buffer->data) {
err = -ENOMEM;
goto out_put;
}
}
if (btsq->bts->snapshot_mode && !buffer->consecutive &&
intel_bts_do_fix_overlap(queue, buffer)) {
err = -ENOMEM;
goto out_put;
}
if (!btsq->bts->synth_opts.callchain &&
!btsq->bts->synth_opts.thread_stack && thread &&
(!old_buffer || btsq->bts->sampling_mode ||
(btsq->bts->snapshot_mode && !buffer->consecutive)))
thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1);
err = intel_bts_process_buffer(btsq, buffer, thread);
auxtrace_buffer__drop_data(buffer);
btsq->buffer = auxtrace_buffer__next(queue, buffer);
if (btsq->buffer) {
if (timestamp)
*timestamp = btsq->buffer->reference;
} else {
if (!btsq->bts->sampling_mode)
btsq->done = 1;
}
out_put:
thread__put(thread);
return err;
}
static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
{
u64 ts = 0;
int ret;
while (1) {
ret = intel_bts_process_queue(btsq, &ts);
if (ret < 0)
return ret;
if (ret)
break;
}
return 0;
}
static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
{
struct auxtrace_queues *queues = &bts->queues;
unsigned int i;
for (i = 0; i < queues->nr_queues; i++) {
struct auxtrace_queue *queue = &bts->queues.queue_array[i];
struct intel_bts_queue *btsq = queue->priv;
if (btsq && btsq->tid == tid)
return intel_bts_flush_queue(btsq);
}
return 0;
}
static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
{
while (1) {
unsigned int queue_nr;
struct auxtrace_queue *queue;
struct intel_bts_queue *btsq;
u64 ts = 0;
int ret;
if (!bts->heap.heap_cnt)
return 0;
if (bts->heap.heap_array[0].ordinal > timestamp)
return 0;
queue_nr = bts->heap.heap_array[0].queue_nr;
queue = &bts->queues.queue_array[queue_nr];
btsq = queue->priv;
auxtrace_heap__pop(&bts->heap);
ret = intel_bts_process_queue(btsq, &ts);
if (ret < 0) {
auxtrace_heap__add(&bts->heap, queue_nr, ts);
return ret;
}
if (!ret) {
ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
if (ret < 0)
return ret;
} else {
btsq->on_heap = false;
}
}
return 0;
}
static int intel_bts_process_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
struct perf_tool *tool)
{
struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
auxtrace);
u64 timestamp;
int err;
if (dump_trace)
return 0;
if (!tool->ordered_events) {
pr_err("Intel BTS requires ordered events\n");
return -EINVAL;
}
if (sample->time && sample->time != (u64)-1)
timestamp = perf_time_to_tsc(sample->time, &bts->tc);
else
timestamp = 0;
err = intel_bts_update_queues(bts);
if (err)
return err;
err = intel_bts_process_queues(bts, timestamp);
if (err)
return err;
if (event->header.type == PERF_RECORD_EXIT) {
err = intel_bts_process_tid_exit(bts, event->fork.tid);
if (err)
return err;
}
if (event->header.type == PERF_RECORD_AUX &&
(event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
bts->synth_opts.errors)
err = intel_bts_lost(bts, sample);
return err;
}
static int intel_bts_process_auxtrace_event(struct perf_session *session,
union perf_event *event,
struct perf_tool *tool __maybe_unused)
{
struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
auxtrace);
if (bts->sampling_mode)
return 0;
if (!bts->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(&bts->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_bts_dump_event(bts, buffer->data,
buffer->size);
auxtrace_buffer__put_data(buffer);
}
}
}
return 0;
}
static int intel_bts_flush(struct perf_session *session,
struct perf_tool *tool __maybe_unused)
{
struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
auxtrace);
int ret;
if (dump_trace || bts->sampling_mode)
return 0;
if (!tool->ordered_events)
return -EINVAL;
ret = intel_bts_update_queues(bts);
if (ret < 0)
return ret;
return intel_bts_process_queues(bts, MAX_TIMESTAMP);
}
static void intel_bts_free_queue(void *priv)
{
struct intel_bts_queue *btsq = priv;
if (!btsq)
return;
free(btsq);
}
static void intel_bts_free_events(struct perf_session *session)
{
struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
auxtrace);
struct auxtrace_queues *queues = &bts->queues;
unsigned int i;
for (i = 0; i < queues->nr_queues; i++) {
intel_bts_free_queue(queues->queue_array[i].priv);
queues->queue_array[i].priv = NULL;
}
auxtrace_queues__free(queues);
}
static void intel_bts_free(struct perf_session *session)
{
struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
auxtrace);
auxtrace_heap__free(&bts->heap);
intel_bts_free_events(session);
session->auxtrace = NULL;
free(bts);
}
struct intel_bts_synth {
struct perf_tool dummy_tool;
struct perf_session *session;
};
static int intel_bts_event_synth(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct intel_bts_synth *intel_bts_synth =
container_of(tool, struct intel_bts_synth, dummy_tool);
return perf_session__deliver_synth_event(intel_bts_synth->session,
event, NULL);
}
static int intel_bts_synth_event(struct perf_session *session,
struct perf_event_attr *attr, u64 id)
{
struct intel_bts_synth intel_bts_synth;
memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
intel_bts_synth.session = session;
return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
&id, intel_bts_event_synth);
}
static int intel_bts_synth_events(struct intel_bts *bts,
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_entry(evlist, evsel) {
if (evsel->attr.type == bts->pmu_type && evsel->ids) {
found = true;
break;
}
}
if (!found) {
pr_debug("There are no selected events with Intel BTS 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;
attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
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 (bts->synth_opts.branches) {
attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
attr.sample_period = 1;
attr.sample_type |= PERF_SAMPLE_ADDR;
pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
id, (u64)attr.sample_type);
err = intel_bts_synth_event(session, &attr, id);
if (err) {
pr_err("%s: failed to synthesize 'branches' event type\n",
__func__);
return err;
}
bts->sample_branches = true;
bts->branches_sample_type = attr.sample_type;
bts->branches_id = id;
/*
* We only use sample types from PERF_SAMPLE_MASK so we can use
* __perf_evsel__sample_size() here.
*/
bts->branches_event_size = sizeof(struct sample_event) +
__perf_evsel__sample_size(attr.sample_type);
}
bts->synth_needs_swap = evsel->needs_swap;
return 0;
}
static const char * const intel_bts_info_fmts[] = {
[INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
[INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
[INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n",
[INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
[INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
[INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
};
static void intel_bts_print_info(u64 *arr, int start, int finish)
{
int i;
if (!dump_trace)
return;
for (i = start; i <= finish; i++)
fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
}
u64 intel_bts_auxtrace_info_priv[INTEL_BTS_AUXTRACE_PRIV_SIZE];
int intel_bts_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_BTS_SNAPSHOT_MODE;
struct intel_bts *bts;
int err;
if (auxtrace_info->header.size < sizeof(struct auxtrace_info_event) +
min_sz)
return -EINVAL;
bts = zalloc(sizeof(struct intel_bts));
if (!bts)
return -ENOMEM;
err = auxtrace_queues__init(&bts->queues);
if (err)
goto err_free;
bts->session = session;
bts->machine = &session->machines.host; /* No kvm support */
bts->auxtrace_type = auxtrace_info->type;
bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
bts->cap_user_time_zero =
auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
bts->sampling_mode = false;
bts->auxtrace.process_event = intel_bts_process_event;
bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
bts->auxtrace.flush_events = intel_bts_flush;
bts->auxtrace.free_events = intel_bts_free_events;
bts->auxtrace.free = intel_bts_free;
session->auxtrace = &bts->auxtrace;
intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
INTEL_BTS_SNAPSHOT_MODE);
if (dump_trace)
return 0;
if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
bts->synth_opts = *session->itrace_synth_opts;
} else {
itrace_synth_opts__set_default(&bts->synth_opts);
if (session->itrace_synth_opts)
bts->synth_opts.thread_stack =
session->itrace_synth_opts->thread_stack;
}
if (bts->synth_opts.calls)
bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
PERF_IP_FLAG_TRACE_END;
if (bts->synth_opts.returns)
bts->branches_filter |= PERF_IP_FLAG_RETURN |
PERF_IP_FLAG_TRACE_BEGIN;
err = intel_bts_synth_events(bts, session);
if (err)
goto err_free_queues;
err = auxtrace_queues__process_index(&bts->queues, session);
if (err)
goto err_free_queues;
if (bts->queues.populated)
bts->data_queued = true;
return 0;
err_free_queues:
auxtrace_queues__free(&bts->queues);
session->auxtrace = NULL;
err_free:
free(bts);
return err;
}