diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/intel-pt.c | 3603 |
1 files changed, 3603 insertions, 0 deletions
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c new file mode 100644 index 000000000..453773ce6 --- /dev/null +++ b/tools/perf/util/intel-pt.c @@ -0,0 +1,3603 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * intel_pt.c: Intel Processor Trace support + * Copyright (c) 2013-2015, Intel Corporation. + */ + +#include <inttypes.h> +#include <stdio.h> +#include <stdbool.h> +#include <errno.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/zalloc.h> + +#include "session.h" +#include "machine.h" +#include "memswap.h" +#include "sort.h" +#include "tool.h" +#include "event.h" +#include "evlist.h" +#include "evsel.h" +#include "map.h" +#include "color.h" +#include "thread.h" +#include "thread-stack.h" +#include "symbol.h" +#include "callchain.h" +#include "dso.h" +#include "debug.h" +#include "auxtrace.h" +#include "tsc.h" +#include "intel-pt.h" +#include "config.h" +#include "util/perf_api_probe.h" +#include "util/synthetic-events.h" +#include "time-utils.h" + +#include "../arch/x86/include/uapi/asm/perf_regs.h" + +#include "intel-pt-decoder/intel-pt-log.h" +#include "intel-pt-decoder/intel-pt-decoder.h" +#include "intel-pt-decoder/intel-pt-insn-decoder.h" +#include "intel-pt-decoder/intel-pt-pkt-decoder.h" + +#define MAX_TIMESTAMP (~0ULL) + +struct range { + u64 start; + u64 end; +}; + +struct intel_pt { + struct auxtrace auxtrace; + struct auxtrace_queues queues; + struct auxtrace_heap heap; + u32 auxtrace_type; + struct perf_session *session; + struct machine *machine; + struct evsel *switch_evsel; + struct thread *unknown_thread; + bool timeless_decoding; + bool sampling_mode; + bool snapshot_mode; + bool per_cpu_mmaps; + bool have_tsc; + bool data_queued; + bool est_tsc; + bool sync_switch; + bool mispred_all; + bool use_thread_stack; + bool callstack; + unsigned int br_stack_sz; + unsigned int br_stack_sz_plus; + int have_sched_switch; + u32 pmu_type; + u64 kernel_start; + u64 switch_ip; + u64 ptss_ip; + + struct perf_tsc_conversion tc; + bool cap_user_time_zero; + + struct itrace_synth_opts synth_opts; + + bool sample_instructions; + u64 instructions_sample_type; + u64 instructions_id; + + bool sample_branches; + u32 branches_filter; + u64 branches_sample_type; + u64 branches_id; + + bool sample_transactions; + u64 transactions_sample_type; + u64 transactions_id; + + bool sample_ptwrites; + u64 ptwrites_sample_type; + u64 ptwrites_id; + + bool sample_pwr_events; + u64 pwr_events_sample_type; + u64 mwait_id; + u64 pwre_id; + u64 exstop_id; + u64 pwrx_id; + u64 cbr_id; + + bool sample_pebs; + struct evsel *pebs_evsel; + + u64 tsc_bit; + u64 mtc_bit; + u64 mtc_freq_bits; + u32 tsc_ctc_ratio_n; + u32 tsc_ctc_ratio_d; + u64 cyc_bit; + u64 noretcomp_bit; + unsigned max_non_turbo_ratio; + unsigned cbr2khz; + + unsigned long num_events; + + char *filter; + struct addr_filters filts; + + struct range *time_ranges; + unsigned int range_cnt; + + struct ip_callchain *chain; + struct branch_stack *br_stack; +}; + +enum switch_state { + INTEL_PT_SS_NOT_TRACING, + INTEL_PT_SS_UNKNOWN, + INTEL_PT_SS_TRACING, + INTEL_PT_SS_EXPECTING_SWITCH_EVENT, + INTEL_PT_SS_EXPECTING_SWITCH_IP, +}; + +struct intel_pt_queue { + struct intel_pt *pt; + unsigned int queue_nr; + struct auxtrace_buffer *buffer; + struct auxtrace_buffer *old_buffer; + void *decoder; + const struct intel_pt_state *state; + struct ip_callchain *chain; + struct branch_stack *last_branch; + union perf_event *event_buf; + bool on_heap; + bool stop; + bool step_through_buffers; + bool use_buffer_pid_tid; + bool sync_switch; + pid_t pid, tid; + int cpu; + int switch_state; + pid_t next_tid; + struct thread *thread; + bool exclude_kernel; + bool have_sample; + u64 time; + u64 timestamp; + u64 sel_timestamp; + bool sel_start; + unsigned int sel_idx; + u32 flags; + u16 insn_len; + u64 last_insn_cnt; + u64 ipc_insn_cnt; + u64 ipc_cyc_cnt; + u64 last_in_insn_cnt; + u64 last_in_cyc_cnt; + u64 last_br_insn_cnt; + u64 last_br_cyc_cnt; + unsigned int cbr_seen; + char insn[INTEL_PT_INSN_BUF_SZ]; +}; + +static void intel_pt_dump(struct intel_pt *pt __maybe_unused, + unsigned char *buf, size_t len) +{ + struct intel_pt_pkt packet; + size_t pos = 0; + int ret, pkt_len, i; + char desc[INTEL_PT_PKT_DESC_MAX]; + const char *color = PERF_COLOR_BLUE; + enum intel_pt_pkt_ctx ctx = INTEL_PT_NO_CTX; + + color_fprintf(stdout, color, + ". ... Intel Processor Trace data: size %zu bytes\n", + len); + + while (len) { + ret = intel_pt_get_packet(buf, len, &packet, &ctx); + if (ret > 0) + pkt_len = ret; + else + pkt_len = 1; + printf("."); + color_fprintf(stdout, color, " %08x: ", pos); + for (i = 0; i < pkt_len; i++) + color_fprintf(stdout, color, " %02x", buf[i]); + for (; i < 16; i++) + color_fprintf(stdout, color, " "); + if (ret > 0) { + ret = intel_pt_pkt_desc(&packet, desc, + INTEL_PT_PKT_DESC_MAX); + if (ret > 0) + color_fprintf(stdout, color, " %s\n", desc); + } else { + color_fprintf(stdout, color, " Bad packet!\n"); + } + pos += pkt_len; + buf += pkt_len; + len -= pkt_len; + } +} + +static void intel_pt_dump_event(struct intel_pt *pt, unsigned char *buf, + size_t len) +{ + printf(".\n"); + intel_pt_dump(pt, buf, len); +} + +static void intel_pt_log_event(union perf_event *event) +{ + FILE *f = intel_pt_log_fp(); + + if (!intel_pt_enable_logging || !f) + return; + + perf_event__fprintf(event, NULL, f); +} + +static void intel_pt_dump_sample(struct perf_session *session, + struct perf_sample *sample) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + + printf("\n"); + intel_pt_dump(pt, sample->aux_sample.data, sample->aux_sample.size); +} + +static bool intel_pt_log_events(struct intel_pt *pt, u64 tm) +{ + struct perf_time_interval *range = pt->synth_opts.ptime_range; + int n = pt->synth_opts.range_num; + + if (pt->synth_opts.log_plus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS) + return true; + + if (pt->synth_opts.log_minus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS) + return false; + + /* perf_time__ranges_skip_sample does not work if time is zero */ + if (!tm) + tm = 1; + + return !n || !perf_time__ranges_skip_sample(range, n, tm); +} + +static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer *a, + struct auxtrace_buffer *b) +{ + bool consecutive = false; + void *start; + + start = intel_pt_find_overlap(a->data, a->size, b->data, b->size, + pt->have_tsc, &consecutive); + if (!start) + return -EINVAL; + b->use_size = b->data + b->size - start; + b->use_data = start; + if (b->use_size && consecutive) + b->consecutive = true; + return 0; +} + +static int intel_pt_get_buffer(struct intel_pt_queue *ptq, + struct auxtrace_buffer *buffer, + struct auxtrace_buffer *old_buffer, + struct intel_pt_buffer *b) +{ + bool might_overlap; + + if (!buffer->data) { + int fd = perf_data__fd(ptq->pt->session->data); + + buffer->data = auxtrace_buffer__get_data(buffer, fd); + if (!buffer->data) + return -ENOMEM; + } + + might_overlap = ptq->pt->snapshot_mode || ptq->pt->sampling_mode; + if (might_overlap && !buffer->consecutive && old_buffer && + intel_pt_do_fix_overlap(ptq->pt, old_buffer, buffer)) + return -ENOMEM; + + if (buffer->use_data) { + b->len = buffer->use_size; + b->buf = buffer->use_data; + } else { + b->len = buffer->size; + b->buf = buffer->data; + } + b->ref_timestamp = buffer->reference; + + if (!old_buffer || (might_overlap && !buffer->consecutive)) { + b->consecutive = false; + b->trace_nr = buffer->buffer_nr + 1; + } else { + b->consecutive = true; + } + + return 0; +} + +/* Do not drop buffers with references - refer intel_pt_get_trace() */ +static void intel_pt_lookahead_drop_buffer(struct intel_pt_queue *ptq, + struct auxtrace_buffer *buffer) +{ + if (!buffer || buffer == ptq->buffer || buffer == ptq->old_buffer) + return; + + auxtrace_buffer__drop_data(buffer); +} + +/* Must be serialized with respect to intel_pt_get_trace() */ +static int intel_pt_lookahead(void *data, intel_pt_lookahead_cb_t cb, + void *cb_data) +{ + struct intel_pt_queue *ptq = data; + struct auxtrace_buffer *buffer = ptq->buffer; + struct auxtrace_buffer *old_buffer = ptq->old_buffer; + struct auxtrace_queue *queue; + int err = 0; + + queue = &ptq->pt->queues.queue_array[ptq->queue_nr]; + + while (1) { + struct intel_pt_buffer b = { .len = 0 }; + + buffer = auxtrace_buffer__next(queue, buffer); + if (!buffer) + break; + + err = intel_pt_get_buffer(ptq, buffer, old_buffer, &b); + if (err) + break; + + if (b.len) { + intel_pt_lookahead_drop_buffer(ptq, old_buffer); + old_buffer = buffer; + } else { + intel_pt_lookahead_drop_buffer(ptq, buffer); + continue; + } + + err = cb(&b, cb_data); + if (err) + break; + } + + if (buffer != old_buffer) + intel_pt_lookahead_drop_buffer(ptq, buffer); + intel_pt_lookahead_drop_buffer(ptq, old_buffer); + + return err; +} + +/* + * This function assumes data is processed sequentially only. + * Must be serialized with respect to intel_pt_lookahead() + */ +static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data) +{ + struct intel_pt_queue *ptq = data; + struct auxtrace_buffer *buffer = ptq->buffer; + struct auxtrace_buffer *old_buffer = ptq->old_buffer; + struct auxtrace_queue *queue; + int err; + + if (ptq->stop) { + b->len = 0; + return 0; + } + + queue = &ptq->pt->queues.queue_array[ptq->queue_nr]; + + buffer = auxtrace_buffer__next(queue, buffer); + if (!buffer) { + if (old_buffer) + auxtrace_buffer__drop_data(old_buffer); + b->len = 0; + return 0; + } + + ptq->buffer = buffer; + + err = intel_pt_get_buffer(ptq, buffer, old_buffer, b); + if (err) + return err; + + if (ptq->step_through_buffers) + ptq->stop = true; + + if (b->len) { + if (old_buffer) + auxtrace_buffer__drop_data(old_buffer); + ptq->old_buffer = buffer; + } else { + auxtrace_buffer__drop_data(buffer); + return intel_pt_get_trace(b, data); + } + + return 0; +} + +struct intel_pt_cache_entry { + struct auxtrace_cache_entry entry; + u64 insn_cnt; + u64 byte_cnt; + enum intel_pt_insn_op op; + enum intel_pt_insn_branch branch; + int length; + int32_t rel; + char insn[INTEL_PT_INSN_BUF_SZ]; +}; + +static int intel_pt_config_div(const char *var, const char *value, void *data) +{ + int *d = data; + long val; + + if (!strcmp(var, "intel-pt.cache-divisor")) { + val = strtol(value, NULL, 0); + if (val > 0 && val <= INT_MAX) + *d = val; + } + + return 0; +} + +static int intel_pt_cache_divisor(void) +{ + static int d; + + if (d) + return d; + + perf_config(intel_pt_config_div, &d); + + if (!d) + d = 64; + + return d; +} + +static unsigned int intel_pt_cache_size(struct dso *dso, + struct machine *machine) +{ + off_t size; + + size = dso__data_size(dso, machine); + size /= intel_pt_cache_divisor(); + if (size < 1000) + return 10; + if (size > (1 << 21)) + return 21; + return 32 - __builtin_clz(size); +} + +static struct auxtrace_cache *intel_pt_cache(struct dso *dso, + struct machine *machine) +{ + struct auxtrace_cache *c; + unsigned int bits; + + if (dso->auxtrace_cache) + return dso->auxtrace_cache; + + bits = intel_pt_cache_size(dso, machine); + + /* Ignoring cache creation failure */ + c = auxtrace_cache__new(bits, sizeof(struct intel_pt_cache_entry), 200); + + dso->auxtrace_cache = c; + + return c; +} + +static int intel_pt_cache_add(struct dso *dso, struct machine *machine, + u64 offset, u64 insn_cnt, u64 byte_cnt, + struct intel_pt_insn *intel_pt_insn) +{ + struct auxtrace_cache *c = intel_pt_cache(dso, machine); + struct intel_pt_cache_entry *e; + int err; + + if (!c) + return -ENOMEM; + + e = auxtrace_cache__alloc_entry(c); + if (!e) + return -ENOMEM; + + e->insn_cnt = insn_cnt; + e->byte_cnt = byte_cnt; + e->op = intel_pt_insn->op; + e->branch = intel_pt_insn->branch; + e->length = intel_pt_insn->length; + e->rel = intel_pt_insn->rel; + memcpy(e->insn, intel_pt_insn->buf, INTEL_PT_INSN_BUF_SZ); + + err = auxtrace_cache__add(c, offset, &e->entry); + if (err) + auxtrace_cache__free_entry(c, e); + + return err; +} + +static struct intel_pt_cache_entry * +intel_pt_cache_lookup(struct dso *dso, struct machine *machine, u64 offset) +{ + struct auxtrace_cache *c = intel_pt_cache(dso, machine); + + if (!c) + return NULL; + + return auxtrace_cache__lookup(dso->auxtrace_cache, offset); +} + +static void intel_pt_cache_invalidate(struct dso *dso, struct machine *machine, + u64 offset) +{ + struct auxtrace_cache *c = intel_pt_cache(dso, machine); + + if (!c) + return; + + auxtrace_cache__remove(dso->auxtrace_cache, offset); +} + +static inline u8 intel_pt_cpumode(struct intel_pt *pt, uint64_t ip) +{ + return ip >= pt->kernel_start ? + PERF_RECORD_MISC_KERNEL : + PERF_RECORD_MISC_USER; +} + +static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, + uint64_t *insn_cnt_ptr, uint64_t *ip, + uint64_t to_ip, uint64_t max_insn_cnt, + void *data) +{ + struct intel_pt_queue *ptq = data; + struct machine *machine = ptq->pt->machine; + struct thread *thread; + struct addr_location al; + unsigned char buf[INTEL_PT_INSN_BUF_SZ]; + ssize_t len; + int x86_64; + u8 cpumode; + u64 offset, start_offset, start_ip; + u64 insn_cnt = 0; + bool one_map = true; + + intel_pt_insn->length = 0; + + if (to_ip && *ip == to_ip) + goto out_no_cache; + + cpumode = intel_pt_cpumode(ptq->pt, *ip); + + thread = ptq->thread; + if (!thread) { + if (cpumode != PERF_RECORD_MISC_KERNEL) + return -EINVAL; + thread = ptq->pt->unknown_thread; + } + + while (1) { + if (!thread__find_map(thread, cpumode, *ip, &al) || !al.map->dso) + return -EINVAL; + + if (al.map->dso->data.status == DSO_DATA_STATUS_ERROR && + dso__data_status_seen(al.map->dso, + DSO_DATA_STATUS_SEEN_ITRACE)) + return -ENOENT; + + offset = al.map->map_ip(al.map, *ip); + + if (!to_ip && one_map) { + struct intel_pt_cache_entry *e; + + e = intel_pt_cache_lookup(al.map->dso, machine, offset); + if (e && + (!max_insn_cnt || e->insn_cnt <= max_insn_cnt)) { + *insn_cnt_ptr = e->insn_cnt; + *ip += e->byte_cnt; + intel_pt_insn->op = e->op; + intel_pt_insn->branch = e->branch; + intel_pt_insn->length = e->length; + intel_pt_insn->rel = e->rel; + memcpy(intel_pt_insn->buf, e->insn, + INTEL_PT_INSN_BUF_SZ); + intel_pt_log_insn_no_data(intel_pt_insn, *ip); + return 0; + } + } + + start_offset = offset; + start_ip = *ip; + + /* Load maps to ensure dso->is_64_bit has been updated */ + map__load(al.map); + + x86_64 = al.map->dso->is_64_bit; + + while (1) { + len = dso__data_read_offset(al.map->dso, machine, + offset, buf, + INTEL_PT_INSN_BUF_SZ); + if (len <= 0) + return -EINVAL; + + if (intel_pt_get_insn(buf, len, x86_64, intel_pt_insn)) + return -EINVAL; + + intel_pt_log_insn(intel_pt_insn, *ip); + + insn_cnt += 1; + + if (intel_pt_insn->branch != INTEL_PT_BR_NO_BRANCH) + goto out; + + if (max_insn_cnt && insn_cnt >= max_insn_cnt) + goto out_no_cache; + + *ip += intel_pt_insn->length; + + if (to_ip && *ip == to_ip) { + intel_pt_insn->length = 0; + goto out_no_cache; + } + + if (*ip >= al.map->end) + break; + + offset += intel_pt_insn->length; + } + one_map = false; + } +out: + *insn_cnt_ptr = insn_cnt; + + if (!one_map) + goto out_no_cache; + + /* + * Didn't lookup in the 'to_ip' case, so do it now to prevent duplicate + * entries. + */ + if (to_ip) { + struct intel_pt_cache_entry *e; + + e = intel_pt_cache_lookup(al.map->dso, machine, start_offset); + if (e) + return 0; + } + + /* Ignore cache errors */ + intel_pt_cache_add(al.map->dso, machine, start_offset, insn_cnt, + *ip - start_ip, intel_pt_insn); + + return 0; + +out_no_cache: + *insn_cnt_ptr = insn_cnt; + return 0; +} + +static bool intel_pt_match_pgd_ip(struct intel_pt *pt, uint64_t ip, + uint64_t offset, const char *filename) +{ + struct addr_filter *filt; + bool have_filter = false; + bool hit_tracestop = false; + bool hit_filter = false; + + list_for_each_entry(filt, &pt->filts.head, list) { + if (filt->start) + have_filter = true; + + if ((filename && !filt->filename) || + (!filename && filt->filename) || + (filename && strcmp(filename, filt->filename))) + continue; + + if (!(offset >= filt->addr && offset < filt->addr + filt->size)) + continue; + + intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s hit filter: %s offset %#"PRIx64" size %#"PRIx64"\n", + ip, offset, filename ? filename : "[kernel]", + filt->start ? "filter" : "stop", + filt->addr, filt->size); + + if (filt->start) + hit_filter = true; + else + hit_tracestop = true; + } + + if (!hit_tracestop && !hit_filter) + intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s is not in a filter region\n", + ip, offset, filename ? filename : "[kernel]"); + + return hit_tracestop || (have_filter && !hit_filter); +} + +static int __intel_pt_pgd_ip(uint64_t ip, void *data) +{ + struct intel_pt_queue *ptq = data; + struct thread *thread; + struct addr_location al; + u8 cpumode; + u64 offset; + + if (ip >= ptq->pt->kernel_start) + return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL); + + cpumode = PERF_RECORD_MISC_USER; + + thread = ptq->thread; + if (!thread) + return -EINVAL; + + if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso) + return -EINVAL; + + offset = al.map->map_ip(al.map, ip); + + return intel_pt_match_pgd_ip(ptq->pt, ip, offset, + al.map->dso->long_name); +} + +static bool intel_pt_pgd_ip(uint64_t ip, void *data) +{ + return __intel_pt_pgd_ip(ip, data) > 0; +} + +static bool intel_pt_get_config(struct intel_pt *pt, + struct perf_event_attr *attr, u64 *config) +{ + if (attr->type == pt->pmu_type) { + if (config) + *config = attr->config; + return true; + } + + return false; +} + +static bool intel_pt_exclude_kernel(struct intel_pt *pt) +{ + struct evsel *evsel; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, NULL) && + !evsel->core.attr.exclude_kernel) + return false; + } + return true; +} + +static bool intel_pt_return_compression(struct intel_pt *pt) +{ + struct evsel *evsel; + u64 config; + + if (!pt->noretcomp_bit) + return true; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, &config) && + (config & pt->noretcomp_bit)) + return false; + } + return true; +} + +static bool intel_pt_branch_enable(struct intel_pt *pt) +{ + struct evsel *evsel; + u64 config; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, &config) && + (config & 1) && !(config & 0x2000)) + return false; + } + return true; +} + +static unsigned int intel_pt_mtc_period(struct intel_pt *pt) +{ + struct evsel *evsel; + unsigned int shift; + u64 config; + + if (!pt->mtc_freq_bits) + return 0; + + for (shift = 0, config = pt->mtc_freq_bits; !(config & 1); shift++) + config >>= 1; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, &config)) + return (config & pt->mtc_freq_bits) >> shift; + } + return 0; +} + +static bool intel_pt_timeless_decoding(struct intel_pt *pt) +{ + struct evsel *evsel; + bool timeless_decoding = true; + u64 config; + + if (!pt->tsc_bit || !pt->cap_user_time_zero) + return true; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (!(evsel->core.attr.sample_type & PERF_SAMPLE_TIME)) + return true; + if (intel_pt_get_config(pt, &evsel->core.attr, &config)) { + if (config & pt->tsc_bit) + timeless_decoding = false; + else + return true; + } + } + return timeless_decoding; +} + +static bool intel_pt_tracing_kernel(struct intel_pt *pt) +{ + struct evsel *evsel; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, NULL) && + !evsel->core.attr.exclude_kernel) + return true; + } + return false; +} + +static bool intel_pt_have_tsc(struct intel_pt *pt) +{ + struct evsel *evsel; + bool have_tsc = false; + u64 config; + + if (!pt->tsc_bit) + return false; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, &config)) { + if (config & pt->tsc_bit) + have_tsc = true; + else + return false; + } + } + return have_tsc; +} + +static bool intel_pt_sampling_mode(struct intel_pt *pt) +{ + struct evsel *evsel; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if ((evsel->core.attr.sample_type & PERF_SAMPLE_AUX) && + evsel->core.attr.aux_sample_size) + return true; + } + return false; +} + +static u64 intel_pt_ctl(struct intel_pt *pt) +{ + struct evsel *evsel; + u64 config; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (intel_pt_get_config(pt, &evsel->core.attr, &config)) + return config; + } + return 0; +} + +static u64 intel_pt_ns_to_ticks(const struct intel_pt *pt, u64 ns) +{ + u64 quot, rem; + + quot = ns / pt->tc.time_mult; + rem = ns % pt->tc.time_mult; + return (quot << pt->tc.time_shift) + (rem << pt->tc.time_shift) / + pt->tc.time_mult; +} + +static struct ip_callchain *intel_pt_alloc_chain(struct intel_pt *pt) +{ + size_t sz = sizeof(struct ip_callchain); + + /* Add 1 to callchain_sz for callchain context */ + sz += (pt->synth_opts.callchain_sz + 1) * sizeof(u64); + return zalloc(sz); +} + +static int intel_pt_callchain_init(struct intel_pt *pt) +{ + struct evsel *evsel; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (!(evsel->core.attr.sample_type & PERF_SAMPLE_CALLCHAIN)) + evsel->synth_sample_type |= PERF_SAMPLE_CALLCHAIN; + } + + pt->chain = intel_pt_alloc_chain(pt); + if (!pt->chain) + return -ENOMEM; + + return 0; +} + +static void intel_pt_add_callchain(struct intel_pt *pt, + struct perf_sample *sample) +{ + struct thread *thread = machine__findnew_thread(pt->machine, + sample->pid, + sample->tid); + + thread_stack__sample_late(thread, sample->cpu, pt->chain, + pt->synth_opts.callchain_sz + 1, sample->ip, + pt->kernel_start); + + sample->callchain = pt->chain; +} + +static struct branch_stack *intel_pt_alloc_br_stack(unsigned int entry_cnt) +{ + size_t sz = sizeof(struct branch_stack); + + sz += entry_cnt * sizeof(struct branch_entry); + return zalloc(sz); +} + +static int intel_pt_br_stack_init(struct intel_pt *pt) +{ + struct evsel *evsel; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (!(evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)) + evsel->synth_sample_type |= PERF_SAMPLE_BRANCH_STACK; + } + + pt->br_stack = intel_pt_alloc_br_stack(pt->br_stack_sz); + if (!pt->br_stack) + return -ENOMEM; + + return 0; +} + +static void intel_pt_add_br_stack(struct intel_pt *pt, + struct perf_sample *sample) +{ + struct thread *thread = machine__findnew_thread(pt->machine, + sample->pid, + sample->tid); + + thread_stack__br_sample_late(thread, sample->cpu, pt->br_stack, + pt->br_stack_sz, sample->ip, + pt->kernel_start); + + sample->branch_stack = pt->br_stack; +} + +/* INTEL_PT_LBR_0, INTEL_PT_LBR_1 and INTEL_PT_LBR_2 */ +#define LBRS_MAX (INTEL_PT_BLK_ITEM_ID_CNT * 3U) + +static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt, + unsigned int queue_nr) +{ + struct intel_pt_params params = { .get_trace = 0, }; + struct perf_env *env = pt->machine->env; + struct intel_pt_queue *ptq; + + ptq = zalloc(sizeof(struct intel_pt_queue)); + if (!ptq) + return NULL; + + if (pt->synth_opts.callchain) { + ptq->chain = intel_pt_alloc_chain(pt); + if (!ptq->chain) + goto out_free; + } + + if (pt->synth_opts.last_branch || pt->synth_opts.other_events) { + unsigned int entry_cnt = max(LBRS_MAX, pt->br_stack_sz); + + ptq->last_branch = intel_pt_alloc_br_stack(entry_cnt); + if (!ptq->last_branch) + goto out_free; + } + + ptq->event_buf = malloc(PERF_SAMPLE_MAX_SIZE); + if (!ptq->event_buf) + goto out_free; + + ptq->pt = pt; + ptq->queue_nr = queue_nr; + ptq->exclude_kernel = intel_pt_exclude_kernel(pt); + ptq->pid = -1; + ptq->tid = -1; + ptq->cpu = -1; + ptq->next_tid = -1; + + params.get_trace = intel_pt_get_trace; + params.walk_insn = intel_pt_walk_next_insn; + params.lookahead = intel_pt_lookahead; + params.data = ptq; + params.return_compression = intel_pt_return_compression(pt); + params.branch_enable = intel_pt_branch_enable(pt); + params.ctl = intel_pt_ctl(pt); + params.max_non_turbo_ratio = pt->max_non_turbo_ratio; + params.mtc_period = intel_pt_mtc_period(pt); + params.tsc_ctc_ratio_n = pt->tsc_ctc_ratio_n; + params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d; + params.quick = pt->synth_opts.quick; + + if (pt->filts.cnt > 0) + params.pgd_ip = intel_pt_pgd_ip; + + if (pt->synth_opts.instructions) { + if (pt->synth_opts.period) { + switch (pt->synth_opts.period_type) { + case PERF_ITRACE_PERIOD_INSTRUCTIONS: + params.period_type = + INTEL_PT_PERIOD_INSTRUCTIONS; + params.period = pt->synth_opts.period; + break; + case PERF_ITRACE_PERIOD_TICKS: + params.period_type = INTEL_PT_PERIOD_TICKS; + params.period = pt->synth_opts.period; + break; + case PERF_ITRACE_PERIOD_NANOSECS: + params.period_type = INTEL_PT_PERIOD_TICKS; + params.period = intel_pt_ns_to_ticks(pt, + pt->synth_opts.period); + break; + default: + break; + } + } + + if (!params.period) { + params.period_type = INTEL_PT_PERIOD_INSTRUCTIONS; + params.period = 1; + } + } + + if (env->cpuid && !strncmp(env->cpuid, "GenuineIntel,6,92,", 18)) + params.flags |= INTEL_PT_FUP_WITH_NLIP; + + ptq->decoder = intel_pt_decoder_new(¶ms); + if (!ptq->decoder) + goto out_free; + + return ptq; + +out_free: + zfree(&ptq->event_buf); + zfree(&ptq->last_branch); + zfree(&ptq->chain); + free(ptq); + return NULL; +} + +static void intel_pt_free_queue(void *priv) +{ + struct intel_pt_queue *ptq = priv; + + if (!ptq) + return; + thread__zput(ptq->thread); + intel_pt_decoder_free(ptq->decoder); + zfree(&ptq->event_buf); + zfree(&ptq->last_branch); + zfree(&ptq->chain); + free(ptq); +} + +static void intel_pt_set_pid_tid_cpu(struct intel_pt *pt, + struct auxtrace_queue *queue) +{ + struct intel_pt_queue *ptq = queue->priv; + + if (queue->tid == -1 || pt->have_sched_switch) { + ptq->tid = machine__get_current_tid(pt->machine, ptq->cpu); + if (ptq->tid == -1) + ptq->pid = -1; + thread__zput(ptq->thread); + } + + if (!ptq->thread && ptq->tid != -1) + ptq->thread = machine__find_thread(pt->machine, -1, ptq->tid); + + if (ptq->thread) { + ptq->pid = ptq->thread->pid_; + if (queue->cpu == -1) + ptq->cpu = ptq->thread->cpu; + } +} + +static void intel_pt_sample_flags(struct intel_pt_queue *ptq) +{ + ptq->insn_len = 0; + if (ptq->state->flags & INTEL_PT_ABORT_TX) { + ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TX_ABORT; + } else if (ptq->state->flags & INTEL_PT_ASYNC) { + if (ptq->state->to_ip) + ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | + PERF_IP_FLAG_ASYNC | + PERF_IP_FLAG_INTERRUPT; + else + ptq->flags = PERF_IP_FLAG_BRANCH | + PERF_IP_FLAG_TRACE_END; + ptq->insn_len = 0; + } else { + if (ptq->state->from_ip) + ptq->flags = intel_pt_insn_type(ptq->state->insn_op); + else + ptq->flags = PERF_IP_FLAG_BRANCH | + PERF_IP_FLAG_TRACE_BEGIN; + if (ptq->state->flags & INTEL_PT_IN_TX) + ptq->flags |= PERF_IP_FLAG_IN_TX; + ptq->insn_len = ptq->state->insn_len; + memcpy(ptq->insn, ptq->state->insn, INTEL_PT_INSN_BUF_SZ); + } + + if (ptq->state->type & INTEL_PT_TRACE_BEGIN) + ptq->flags |= PERF_IP_FLAG_TRACE_BEGIN; + if (ptq->state->type & INTEL_PT_TRACE_END) + ptq->flags |= PERF_IP_FLAG_TRACE_END; +} + +static void intel_pt_setup_time_range(struct intel_pt *pt, + struct intel_pt_queue *ptq) +{ + if (!pt->range_cnt) + return; + + ptq->sel_timestamp = pt->time_ranges[0].start; + ptq->sel_idx = 0; + + if (ptq->sel_timestamp) { + ptq->sel_start = true; + } else { + ptq->sel_timestamp = pt->time_ranges[0].end; + ptq->sel_start = false; + } +} + +static int intel_pt_setup_queue(struct intel_pt *pt, + struct auxtrace_queue *queue, + unsigned int queue_nr) +{ + struct intel_pt_queue *ptq = queue->priv; + + if (list_empty(&queue->head)) + return 0; + + if (!ptq) { + ptq = intel_pt_alloc_queue(pt, queue_nr); + if (!ptq) + return -ENOMEM; + queue->priv = ptq; + + if (queue->cpu != -1) + ptq->cpu = queue->cpu; + ptq->tid = queue->tid; + + ptq->cbr_seen = UINT_MAX; + + if (pt->sampling_mode && !pt->snapshot_mode && + pt->timeless_decoding) + ptq->step_through_buffers = true; + + ptq->sync_switch = pt->sync_switch; + + intel_pt_setup_time_range(pt, ptq); + } + + if (!ptq->on_heap && + (!ptq->sync_switch || + ptq->switch_state != INTEL_PT_SS_EXPECTING_SWITCH_EVENT)) { + const struct intel_pt_state *state; + int ret; + + if (pt->timeless_decoding) + return 0; + + intel_pt_log("queue %u getting timestamp\n", queue_nr); + intel_pt_log("queue %u decoding cpu %d pid %d tid %d\n", + queue_nr, ptq->cpu, ptq->pid, ptq->tid); + + if (ptq->sel_start && ptq->sel_timestamp) { + ret = intel_pt_fast_forward(ptq->decoder, + ptq->sel_timestamp); + if (ret) + return ret; + } + + while (1) { + state = intel_pt_decode(ptq->decoder); + if (state->err) { + if (state->err == INTEL_PT_ERR_NODATA) { + intel_pt_log("queue %u has no timestamp\n", + queue_nr); + return 0; + } + continue; + } + if (state->timestamp) + break; + } + + ptq->timestamp = state->timestamp; + intel_pt_log("queue %u timestamp 0x%" PRIx64 "\n", + queue_nr, ptq->timestamp); + ptq->state = state; + ptq->have_sample = true; + if (ptq->sel_start && ptq->sel_timestamp && + ptq->timestamp < ptq->sel_timestamp) + ptq->have_sample = false; + intel_pt_sample_flags(ptq); + ret = auxtrace_heap__add(&pt->heap, queue_nr, ptq->timestamp); + if (ret) + return ret; + ptq->on_heap = true; + } + + return 0; +} + +static int intel_pt_setup_queues(struct intel_pt *pt) +{ + unsigned int i; + int ret; + + for (i = 0; i < pt->queues.nr_queues; i++) { + ret = intel_pt_setup_queue(pt, &pt->queues.queue_array[i], i); + if (ret) + return ret; + } + return 0; +} + +static inline bool intel_pt_skip_event(struct intel_pt *pt) +{ + return pt->synth_opts.initial_skip && + pt->num_events++ < pt->synth_opts.initial_skip; +} + +/* + * Cannot count CBR as skipped because it won't go away until cbr == cbr_seen. + * Also ensure CBR is first non-skipped event by allowing for 4 more samples + * from this decoder state. + */ +static inline bool intel_pt_skip_cbr_event(struct intel_pt *pt) +{ + return pt->synth_opts.initial_skip && + pt->num_events + 4 < pt->synth_opts.initial_skip; +} + +static void intel_pt_prep_a_sample(struct intel_pt_queue *ptq, + union perf_event *event, + struct perf_sample *sample) +{ + event->sample.header.type = PERF_RECORD_SAMPLE; + event->sample.header.size = sizeof(struct perf_event_header); + + sample->pid = ptq->pid; + sample->tid = ptq->tid; + sample->cpu = ptq->cpu; + sample->insn_len = ptq->insn_len; + memcpy(sample->insn, ptq->insn, INTEL_PT_INSN_BUF_SZ); +} + +static void intel_pt_prep_b_sample(struct intel_pt *pt, + struct intel_pt_queue *ptq, + union perf_event *event, + struct perf_sample *sample) +{ + intel_pt_prep_a_sample(ptq, event, sample); + + if (!pt->timeless_decoding) + sample->time = tsc_to_perf_time(ptq->timestamp, &pt->tc); + + sample->ip = ptq->state->from_ip; + sample->cpumode = intel_pt_cpumode(pt, sample->ip); + sample->addr = ptq->state->to_ip; + sample->period = 1; + sample->flags = ptq->flags; + + event->sample.header.misc = sample->cpumode; +} + +static int intel_pt_inject_event(union perf_event *event, + struct perf_sample *sample, u64 type) +{ + event->header.size = perf_event__sample_event_size(sample, type, 0); + return perf_event__synthesize_sample(event, type, 0, sample); +} + +static inline int intel_pt_opt_inject(struct intel_pt *pt, + union perf_event *event, + struct perf_sample *sample, u64 type) +{ + if (!pt->synth_opts.inject) + return 0; + + return intel_pt_inject_event(event, sample, type); +} + +static int intel_pt_deliver_synth_event(struct intel_pt *pt, + union perf_event *event, + struct perf_sample *sample, u64 type) +{ + int ret; + + ret = intel_pt_opt_inject(pt, event, sample, type); + if (ret) + return ret; + + ret = perf_session__deliver_synth_event(pt->session, event, sample); + if (ret) + pr_err("Intel PT: failed to deliver event, error %d\n", ret); + + return ret; +} + +static int intel_pt_synth_branch_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct dummy_branch_stack { + u64 nr; + u64 hw_idx; + struct branch_entry entries; + } dummy_bs; + + if (pt->branches_filter && !(pt->branches_filter & ptq->flags)) + return 0; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_b_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->branches_id; + sample.stream_id = ptq->pt->branches_id; + + /* + * perf report cannot handle events without a branch stack when using + * SORT_MODE__BRANCH so make a dummy one. + */ + if (pt->synth_opts.last_branch && sort__mode == SORT_MODE__BRANCH) { + dummy_bs = (struct dummy_branch_stack){ + .nr = 1, + .hw_idx = -1ULL, + .entries = { + .from = sample.ip, + .to = sample.addr, + }, + }; + sample.branch_stack = (struct branch_stack *)&dummy_bs; + } + + if (ptq->state->flags & INTEL_PT_SAMPLE_IPC) + sample.cyc_cnt = ptq->ipc_cyc_cnt - ptq->last_br_cyc_cnt; + if (sample.cyc_cnt) { + sample.insn_cnt = ptq->ipc_insn_cnt - ptq->last_br_insn_cnt; + ptq->last_br_insn_cnt = ptq->ipc_insn_cnt; + ptq->last_br_cyc_cnt = ptq->ipc_cyc_cnt; + } + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->branches_sample_type); +} + +static void intel_pt_prep_sample(struct intel_pt *pt, + struct intel_pt_queue *ptq, + union perf_event *event, + struct perf_sample *sample) +{ + intel_pt_prep_b_sample(pt, ptq, event, sample); + + if (pt->synth_opts.callchain) { + thread_stack__sample(ptq->thread, ptq->cpu, ptq->chain, + pt->synth_opts.callchain_sz + 1, + sample->ip, pt->kernel_start); + sample->callchain = ptq->chain; + } + + if (pt->synth_opts.last_branch) { + thread_stack__br_sample(ptq->thread, ptq->cpu, ptq->last_branch, + pt->br_stack_sz); + sample->branch_stack = ptq->last_branch; + } +} + +static int intel_pt_synth_instruction_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->instructions_id; + sample.stream_id = ptq->pt->instructions_id; + if (pt->synth_opts.quick) + sample.period = 1; + else + sample.period = ptq->state->tot_insn_cnt - ptq->last_insn_cnt; + + if (ptq->state->flags & INTEL_PT_SAMPLE_IPC) + sample.cyc_cnt = ptq->ipc_cyc_cnt - ptq->last_in_cyc_cnt; + if (sample.cyc_cnt) { + sample.insn_cnt = ptq->ipc_insn_cnt - ptq->last_in_insn_cnt; + ptq->last_in_insn_cnt = ptq->ipc_insn_cnt; + ptq->last_in_cyc_cnt = ptq->ipc_cyc_cnt; + } + + ptq->last_insn_cnt = ptq->state->tot_insn_cnt; + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->instructions_sample_type); +} + +static int intel_pt_synth_transaction_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->transactions_id; + sample.stream_id = ptq->pt->transactions_id; + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->transactions_sample_type); +} + +static void intel_pt_prep_p_sample(struct intel_pt *pt, + struct intel_pt_queue *ptq, + union perf_event *event, + struct perf_sample *sample) +{ + intel_pt_prep_sample(pt, ptq, event, sample); + + /* + * Zero IP is used to mean "trace start" but that is not the case for + * power or PTWRITE events with no IP, so clear the flags. + */ + if (!sample->ip) + sample->flags = 0; +} + +static int intel_pt_synth_ptwrite_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_ptwrite raw; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->ptwrites_id; + sample.stream_id = ptq->pt->ptwrites_id; + + raw.flags = 0; + raw.ip = !!(ptq->state->flags & INTEL_PT_FUP_IP); + raw.payload = cpu_to_le64(ptq->state->ptw_payload); + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->ptwrites_sample_type); +} + +static int intel_pt_synth_cbr_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_cbr raw; + u32 flags; + + if (intel_pt_skip_cbr_event(pt)) + return 0; + + ptq->cbr_seen = ptq->state->cbr; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->cbr_id; + sample.stream_id = ptq->pt->cbr_id; + + flags = (u16)ptq->state->cbr_payload | (pt->max_non_turbo_ratio << 16); + raw.flags = cpu_to_le32(flags); + raw.freq = cpu_to_le32(raw.cbr * pt->cbr2khz); + raw.reserved3 = 0; + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->pwr_events_sample_type); +} + +static int intel_pt_synth_mwait_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_mwait raw; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->mwait_id; + sample.stream_id = ptq->pt->mwait_id; + + raw.reserved = 0; + raw.payload = cpu_to_le64(ptq->state->mwait_payload); + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->pwr_events_sample_type); +} + +static int intel_pt_synth_pwre_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_pwre raw; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->pwre_id; + sample.stream_id = ptq->pt->pwre_id; + + raw.reserved = 0; + raw.payload = cpu_to_le64(ptq->state->pwre_payload); + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->pwr_events_sample_type); +} + +static int intel_pt_synth_exstop_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_exstop raw; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->exstop_id; + sample.stream_id = ptq->pt->exstop_id; + + raw.flags = 0; + raw.ip = !!(ptq->state->flags & INTEL_PT_FUP_IP); + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->pwr_events_sample_type); +} + +static int intel_pt_synth_pwrx_sample(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + union perf_event *event = ptq->event_buf; + struct perf_sample sample = { .ip = 0, }; + struct perf_synth_intel_pwrx raw; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_p_sample(pt, ptq, event, &sample); + + sample.id = ptq->pt->pwrx_id; + sample.stream_id = ptq->pt->pwrx_id; + + raw.reserved = 0; + raw.payload = cpu_to_le64(ptq->state->pwrx_payload); + + sample.raw_size = perf_synth__raw_size(raw); + sample.raw_data = perf_synth__raw_data(&raw); + + return intel_pt_deliver_synth_event(pt, event, &sample, + pt->pwr_events_sample_type); +} + +/* + * PEBS gp_regs array indexes plus 1 so that 0 means not present. Refer + * intel_pt_add_gp_regs(). + */ +static const int pebs_gp_regs[] = { + [PERF_REG_X86_FLAGS] = 1, + [PERF_REG_X86_IP] = 2, + [PERF_REG_X86_AX] = 3, + [PERF_REG_X86_CX] = 4, + [PERF_REG_X86_DX] = 5, + [PERF_REG_X86_BX] = 6, + [PERF_REG_X86_SP] = 7, + [PERF_REG_X86_BP] = 8, + [PERF_REG_X86_SI] = 9, + [PERF_REG_X86_DI] = 10, + [PERF_REG_X86_R8] = 11, + [PERF_REG_X86_R9] = 12, + [PERF_REG_X86_R10] = 13, + [PERF_REG_X86_R11] = 14, + [PERF_REG_X86_R12] = 15, + [PERF_REG_X86_R13] = 16, + [PERF_REG_X86_R14] = 17, + [PERF_REG_X86_R15] = 18, +}; + +static u64 *intel_pt_add_gp_regs(struct regs_dump *intr_regs, u64 *pos, + const struct intel_pt_blk_items *items, + u64 regs_mask) +{ + const u64 *gp_regs = items->val[INTEL_PT_GP_REGS_POS]; + u32 mask = items->mask[INTEL_PT_GP_REGS_POS]; + u32 bit; + int i; + + for (i = 0, bit = 1; i < PERF_REG_X86_64_MAX; i++, bit <<= 1) { + /* Get the PEBS gp_regs array index */ + int n = pebs_gp_regs[i] - 1; + + if (n < 0) + continue; + /* + * Add only registers that were requested (i.e. 'regs_mask') and + * that were provided (i.e. 'mask'), and update the resulting + * mask (i.e. 'intr_regs->mask') accordingly. + */ + if (mask & 1 << n && regs_mask & bit) { + intr_regs->mask |= bit; + *pos++ = gp_regs[n]; + } + } + + return pos; +} + +#ifndef PERF_REG_X86_XMM0 +#define PERF_REG_X86_XMM0 32 +#endif + +static void intel_pt_add_xmm(struct regs_dump *intr_regs, u64 *pos, + const struct intel_pt_blk_items *items, + u64 regs_mask) +{ + u32 mask = items->has_xmm & (regs_mask >> PERF_REG_X86_XMM0); + const u64 *xmm = items->xmm; + + /* + * If there are any XMM registers, then there should be all of them. + * Nevertheless, follow the logic to add only registers that were + * requested (i.e. 'regs_mask') and that were provided (i.e. 'mask'), + * and update the resulting mask (i.e. 'intr_regs->mask') accordingly. + */ + intr_regs->mask |= (u64)mask << PERF_REG_X86_XMM0; + + for (; mask; mask >>= 1, xmm++) { + if (mask & 1) + *pos++ = *xmm; + } +} + +#define LBR_INFO_MISPRED (1ULL << 63) +#define LBR_INFO_IN_TX (1ULL << 62) +#define LBR_INFO_ABORT (1ULL << 61) +#define LBR_INFO_CYCLES 0xffff + +/* Refer kernel's intel_pmu_store_pebs_lbrs() */ +static u64 intel_pt_lbr_flags(u64 info) +{ + union { + struct branch_flags flags; + u64 result; + } u; + + u.result = 0; + u.flags.mispred = !!(info & LBR_INFO_MISPRED); + u.flags.predicted = !(info & LBR_INFO_MISPRED); + u.flags.in_tx = !!(info & LBR_INFO_IN_TX); + u.flags.abort = !!(info & LBR_INFO_ABORT); + u.flags.cycles = info & LBR_INFO_CYCLES; + + return u.result; +} + +static void intel_pt_add_lbrs(struct branch_stack *br_stack, + const struct intel_pt_blk_items *items) +{ + u64 *to; + int i; + + br_stack->nr = 0; + + to = &br_stack->entries[0].from; + + for (i = INTEL_PT_LBR_0_POS; i <= INTEL_PT_LBR_2_POS; i++) { + u32 mask = items->mask[i]; + const u64 *from = items->val[i]; + + for (; mask; mask >>= 3, from += 3) { + if ((mask & 7) == 7) { + *to++ = from[0]; + *to++ = from[1]; + *to++ = intel_pt_lbr_flags(from[2]); + br_stack->nr += 1; + } + } + } +} + +static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq) +{ + const struct intel_pt_blk_items *items = &ptq->state->items; + struct perf_sample sample = { .ip = 0, }; + union perf_event *event = ptq->event_buf; + struct intel_pt *pt = ptq->pt; + struct evsel *evsel = pt->pebs_evsel; + u64 sample_type = evsel->core.attr.sample_type; + u64 id = evsel->core.id[0]; + u8 cpumode; + u64 regs[8 * sizeof(sample.intr_regs.mask)]; + + if (intel_pt_skip_event(pt)) + return 0; + + intel_pt_prep_a_sample(ptq, event, &sample); + + sample.id = id; + sample.stream_id = id; + + if (!evsel->core.attr.freq) + sample.period = evsel->core.attr.sample_period; + + /* No support for non-zero CS base */ + if (items->has_ip) + sample.ip = items->ip; + else if (items->has_rip) + sample.ip = items->rip; + else + sample.ip = ptq->state->from_ip; + + /* No support for guest mode at this time */ + cpumode = sample.ip < ptq->pt->kernel_start ? + PERF_RECORD_MISC_USER : + PERF_RECORD_MISC_KERNEL; + + event->sample.header.misc = cpumode | PERF_RECORD_MISC_EXACT_IP; + + sample.cpumode = cpumode; + + if (sample_type & PERF_SAMPLE_TIME) { + u64 timestamp = 0; + + if (items->has_timestamp) + timestamp = items->timestamp; + else if (!pt->timeless_decoding) + timestamp = ptq->timestamp; + if (timestamp) + sample.time = tsc_to_perf_time(timestamp, &pt->tc); + } + + if (sample_type & PERF_SAMPLE_CALLCHAIN && + pt->synth_opts.callchain) { + thread_stack__sample(ptq->thread, ptq->cpu, ptq->chain, + pt->synth_opts.callchain_sz, sample.ip, + pt->kernel_start); + sample.callchain = ptq->chain; + } + + if (sample_type & PERF_SAMPLE_REGS_INTR && + (items->mask[INTEL_PT_GP_REGS_POS] || + items->mask[INTEL_PT_XMM_POS])) { + u64 regs_mask = evsel->core.attr.sample_regs_intr; + u64 *pos; + + sample.intr_regs.abi = items->is_32_bit ? + PERF_SAMPLE_REGS_ABI_32 : + PERF_SAMPLE_REGS_ABI_64; + sample.intr_regs.regs = regs; + + pos = intel_pt_add_gp_regs(&sample.intr_regs, regs, items, regs_mask); + + intel_pt_add_xmm(&sample.intr_regs, pos, items, regs_mask); + } + + if (sample_type & PERF_SAMPLE_BRANCH_STACK) { + if (items->mask[INTEL_PT_LBR_0_POS] || + items->mask[INTEL_PT_LBR_1_POS] || + items->mask[INTEL_PT_LBR_2_POS]) { + intel_pt_add_lbrs(ptq->last_branch, items); + } else if (pt->synth_opts.last_branch) { + thread_stack__br_sample(ptq->thread, ptq->cpu, + ptq->last_branch, + pt->br_stack_sz); + } else { + ptq->last_branch->nr = 0; + } + sample.branch_stack = ptq->last_branch; + } + + if (sample_type & PERF_SAMPLE_ADDR && items->has_mem_access_address) + sample.addr = items->mem_access_address; + + if (sample_type & PERF_SAMPLE_WEIGHT) { + /* + * Refer kernel's setup_pebs_adaptive_sample_data() and + * intel_hsw_weight(). + */ + if (items->has_mem_access_latency) + sample.weight = items->mem_access_latency; + if (!sample.weight && items->has_tsx_aux_info) { + /* Cycles last block */ + sample.weight = (u32)items->tsx_aux_info; + } + } + + if (sample_type & PERF_SAMPLE_TRANSACTION && items->has_tsx_aux_info) { + u64 ax = items->has_rax ? items->rax : 0; + /* Refer kernel's intel_hsw_transaction() */ + u64 txn = (u8)(items->tsx_aux_info >> 32); + + /* For RTM XABORTs also log the abort code from AX */ + if (txn & PERF_TXN_TRANSACTION && ax & 1) + txn |= ((ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT; + sample.transaction = txn; + } + + return intel_pt_deliver_synth_event(pt, event, &sample, sample_type); +} + +static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu, + pid_t pid, pid_t tid, u64 ip, u64 timestamp) +{ + union perf_event event; + char msg[MAX_AUXTRACE_ERROR_MSG]; + int err; + + if (pt->synth_opts.error_minus_flags) { + if (code == INTEL_PT_ERR_OVR && + pt->synth_opts.error_minus_flags & AUXTRACE_ERR_FLG_OVERFLOW) + return 0; + if (code == INTEL_PT_ERR_LOST && + pt->synth_opts.error_minus_flags & AUXTRACE_ERR_FLG_DATA_LOST) + return 0; + } + + intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG); + + auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE, + code, cpu, pid, tid, ip, msg, timestamp); + + err = perf_session__deliver_synth_event(pt->session, &event, NULL); + if (err) + pr_err("Intel Processor Trace: failed to deliver error event, error %d\n", + err); + + return err; +} + +static int intel_ptq_synth_error(struct intel_pt_queue *ptq, + const struct intel_pt_state *state) +{ + struct intel_pt *pt = ptq->pt; + u64 tm = ptq->timestamp; + + tm = pt->timeless_decoding ? 0 : tsc_to_perf_time(tm, &pt->tc); + + return intel_pt_synth_error(pt, state->err, ptq->cpu, ptq->pid, + ptq->tid, state->from_ip, tm); +} + +static int intel_pt_next_tid(struct intel_pt *pt, struct intel_pt_queue *ptq) +{ + struct auxtrace_queue *queue; + pid_t tid = ptq->next_tid; + int err; + + if (tid == -1) + return 0; + + intel_pt_log("switch: cpu %d tid %d\n", ptq->cpu, tid); + + err = machine__set_current_tid(pt->machine, ptq->cpu, -1, tid); + + queue = &pt->queues.queue_array[ptq->queue_nr]; + intel_pt_set_pid_tid_cpu(pt, queue); + + ptq->next_tid = -1; + + return err; +} + +static inline bool intel_pt_is_switch_ip(struct intel_pt_queue *ptq, u64 ip) +{ + struct intel_pt *pt = ptq->pt; + + return ip == pt->switch_ip && + (ptq->flags & PERF_IP_FLAG_BRANCH) && + !(ptq->flags & (PERF_IP_FLAG_CONDITIONAL | PERF_IP_FLAG_ASYNC | + PERF_IP_FLAG_INTERRUPT | PERF_IP_FLAG_TX_ABORT)); +} + +#define INTEL_PT_PWR_EVT (INTEL_PT_MWAIT_OP | INTEL_PT_PWR_ENTRY | \ + INTEL_PT_EX_STOP | INTEL_PT_PWR_EXIT) + +static int intel_pt_sample(struct intel_pt_queue *ptq) +{ + const struct intel_pt_state *state = ptq->state; + struct intel_pt *pt = ptq->pt; + int err; + + if (!ptq->have_sample) + return 0; + + ptq->have_sample = false; + + ptq->ipc_insn_cnt = ptq->state->tot_insn_cnt; + ptq->ipc_cyc_cnt = ptq->state->tot_cyc_cnt; + + /* + * Do PEBS first to allow for the possibility that the PEBS timestamp + * precedes the current timestamp. + */ + if (pt->sample_pebs && state->type & INTEL_PT_BLK_ITEMS) { + err = intel_pt_synth_pebs_sample(ptq); + if (err) + return err; + } + + if (pt->sample_pwr_events) { + if (ptq->state->cbr != ptq->cbr_seen) { + err = intel_pt_synth_cbr_sample(ptq); + if (err) + return err; + } + if (state->type & INTEL_PT_PWR_EVT) { + if (state->type & INTEL_PT_MWAIT_OP) { + err = intel_pt_synth_mwait_sample(ptq); + if (err) + return err; + } + if (state->type & INTEL_PT_PWR_ENTRY) { + err = intel_pt_synth_pwre_sample(ptq); + if (err) + return err; + } + if (state->type & INTEL_PT_EX_STOP) { + err = intel_pt_synth_exstop_sample(ptq); + if (err) + return err; + } + if (state->type & INTEL_PT_PWR_EXIT) { + err = intel_pt_synth_pwrx_sample(ptq); + if (err) + return err; + } + } + } + + if (pt->sample_instructions && (state->type & INTEL_PT_INSTRUCTION)) { + err = intel_pt_synth_instruction_sample(ptq); + if (err) + return err; + } + + if (pt->sample_transactions && (state->type & INTEL_PT_TRANSACTION)) { + err = intel_pt_synth_transaction_sample(ptq); + if (err) + return err; + } + + if (pt->sample_ptwrites && (state->type & INTEL_PT_PTW)) { + err = intel_pt_synth_ptwrite_sample(ptq); + if (err) + return err; + } + + if (!(state->type & INTEL_PT_BRANCH)) + return 0; + + if (pt->use_thread_stack) { + thread_stack__event(ptq->thread, ptq->cpu, ptq->flags, + state->from_ip, state->to_ip, ptq->insn_len, + state->trace_nr, pt->callstack, + pt->br_stack_sz_plus, + pt->mispred_all); + } else { + thread_stack__set_trace_nr(ptq->thread, ptq->cpu, state->trace_nr); + } + + if (pt->sample_branches) { + err = intel_pt_synth_branch_sample(ptq); + if (err) + return err; + } + + if (!ptq->sync_switch) + return 0; + + if (intel_pt_is_switch_ip(ptq, state->to_ip)) { + switch (ptq->switch_state) { + case INTEL_PT_SS_NOT_TRACING: + case INTEL_PT_SS_UNKNOWN: + case INTEL_PT_SS_EXPECTING_SWITCH_IP: + err = intel_pt_next_tid(pt, ptq); + if (err) + return err; + ptq->switch_state = INTEL_PT_SS_TRACING; + break; + default: + ptq->switch_state = INTEL_PT_SS_EXPECTING_SWITCH_EVENT; + return 1; + } + } else if (!state->to_ip) { + ptq->switch_state = INTEL_PT_SS_NOT_TRACING; + } else if (ptq->switch_state == INTEL_PT_SS_NOT_TRACING) { + ptq->switch_state = INTEL_PT_SS_UNKNOWN; + } else if (ptq->switch_state == INTEL_PT_SS_UNKNOWN && + state->to_ip == pt->ptss_ip && + (ptq->flags & PERF_IP_FLAG_CALL)) { + ptq->switch_state = INTEL_PT_SS_TRACING; + } + + return 0; +} + +static u64 intel_pt_switch_ip(struct intel_pt *pt, u64 *ptss_ip) +{ + struct machine *machine = pt->machine; + struct map *map; + struct symbol *sym, *start; + u64 ip, switch_ip = 0; + const char *ptss; + + if (ptss_ip) + *ptss_ip = 0; + + map = machine__kernel_map(machine); + if (!map) + return 0; + + if (map__load(map)) + return 0; + + start = dso__first_symbol(map->dso); + + for (sym = start; sym; sym = dso__next_symbol(sym)) { + if (sym->binding == STB_GLOBAL && + !strcmp(sym->name, "__switch_to")) { + ip = map->unmap_ip(map, sym->start); + if (ip >= map->start && ip < map->end) { + switch_ip = ip; + break; + } + } + } + + if (!switch_ip || !ptss_ip) + return 0; + + if (pt->have_sched_switch == 1) + ptss = "perf_trace_sched_switch"; + else + ptss = "__perf_event_task_sched_out"; + + for (sym = start; sym; sym = dso__next_symbol(sym)) { + if (!strcmp(sym->name, ptss)) { + ip = map->unmap_ip(map, sym->start); + if (ip >= map->start && ip < map->end) { + *ptss_ip = ip; + break; + } + } + } + + return switch_ip; +} + +static void intel_pt_enable_sync_switch(struct intel_pt *pt) +{ + unsigned int i; + + pt->sync_switch = true; + + for (i = 0; i < pt->queues.nr_queues; i++) { + struct auxtrace_queue *queue = &pt->queues.queue_array[i]; + struct intel_pt_queue *ptq = queue->priv; + + if (ptq) + ptq->sync_switch = true; + } +} + +/* + * To filter against time ranges, it is only necessary to look at the next start + * or end time. + */ +static bool intel_pt_next_time(struct intel_pt_queue *ptq) +{ + struct intel_pt *pt = ptq->pt; + + if (ptq->sel_start) { + /* Next time is an end time */ + ptq->sel_start = false; + ptq->sel_timestamp = pt->time_ranges[ptq->sel_idx].end; + return true; + } else if (ptq->sel_idx + 1 < pt->range_cnt) { + /* Next time is a start time */ + ptq->sel_start = true; + ptq->sel_idx += 1; + ptq->sel_timestamp = pt->time_ranges[ptq->sel_idx].start; + return true; + } + + /* No next time */ + return false; +} + +static int intel_pt_time_filter(struct intel_pt_queue *ptq, u64 *ff_timestamp) +{ + int err; + + while (1) { + if (ptq->sel_start) { + if (ptq->timestamp >= ptq->sel_timestamp) { + /* After start time, so consider next time */ + intel_pt_next_time(ptq); + if (!ptq->sel_timestamp) { + /* No end time */ + return 0; + } + /* Check against end time */ + continue; + } + /* Before start time, so fast forward */ + ptq->have_sample = false; + if (ptq->sel_timestamp > *ff_timestamp) { + if (ptq->sync_switch) { + intel_pt_next_tid(ptq->pt, ptq); + ptq->switch_state = INTEL_PT_SS_UNKNOWN; + } + *ff_timestamp = ptq->sel_timestamp; + err = intel_pt_fast_forward(ptq->decoder, + ptq->sel_timestamp); + if (err) + return err; + } + return 0; + } else if (ptq->timestamp > ptq->sel_timestamp) { + /* After end time, so consider next time */ + if (!intel_pt_next_time(ptq)) { + /* No next time range, so stop decoding */ + ptq->have_sample = false; + ptq->switch_state = INTEL_PT_SS_NOT_TRACING; + return 1; + } + /* Check against next start time */ + continue; + } else { + /* Before end time */ + return 0; + } + } +} + +static int intel_pt_run_decoder(struct intel_pt_queue *ptq, u64 *timestamp) +{ + const struct intel_pt_state *state = ptq->state; + struct intel_pt *pt = ptq->pt; + u64 ff_timestamp = 0; + int err; + + if (!pt->kernel_start) { + pt->kernel_start = machine__kernel_start(pt->machine); + if (pt->per_cpu_mmaps && + (pt->have_sched_switch == 1 || pt->have_sched_switch == 3) && + !pt->timeless_decoding && intel_pt_tracing_kernel(pt) && + !pt->sampling_mode) { + pt->switch_ip = intel_pt_switch_ip(pt, &pt->ptss_ip); + if (pt->switch_ip) { + intel_pt_log("switch_ip: %"PRIx64" ptss_ip: %"PRIx64"\n", + pt->switch_ip, pt->ptss_ip); + intel_pt_enable_sync_switch(pt); + } + } + } + + intel_pt_log("queue %u decoding cpu %d pid %d tid %d\n", + ptq->queue_nr, ptq->cpu, ptq->pid, ptq->tid); + while (1) { + err = intel_pt_sample(ptq); + if (err) + return err; + + state = intel_pt_decode(ptq->decoder); + if (state->err) { + if (state->err == INTEL_PT_ERR_NODATA) + return 1; + if (ptq->sync_switch && + state->from_ip >= pt->kernel_start) { + ptq->sync_switch = false; + intel_pt_next_tid(pt, ptq); + } + ptq->timestamp = state->est_timestamp; + if (pt->synth_opts.errors) { + err = intel_ptq_synth_error(ptq, state); + if (err) + return err; + } + continue; + } + + ptq->state = state; + ptq->have_sample = true; + intel_pt_sample_flags(ptq); + + /* Use estimated TSC upon return to user space */ + if (pt->est_tsc && + (state->from_ip >= pt->kernel_start || !state->from_ip) && + state->to_ip && state->to_ip < pt->kernel_start) { + intel_pt_log("TSC %"PRIx64" est. TSC %"PRIx64"\n", + state->timestamp, state->est_timestamp); + ptq->timestamp = state->est_timestamp; + /* Use estimated TSC in unknown switch state */ + } else if (ptq->sync_switch && + ptq->switch_state == INTEL_PT_SS_UNKNOWN && + intel_pt_is_switch_ip(ptq, state->to_ip) && + ptq->next_tid == -1) { + intel_pt_log("TSC %"PRIx64" est. TSC %"PRIx64"\n", + state->timestamp, state->est_timestamp); + ptq->timestamp = state->est_timestamp; + } else if (state->timestamp > ptq->timestamp) { + ptq->timestamp = state->timestamp; + } + + if (ptq->sel_timestamp) { + err = intel_pt_time_filter(ptq, &ff_timestamp); + if (err) + return err; + } + + if (!pt->timeless_decoding && ptq->timestamp >= *timestamp) { + *timestamp = ptq->timestamp; + return 0; + } + } + return 0; +} + +static inline int intel_pt_update_queues(struct intel_pt *pt) +{ + if (pt->queues.new_data) { + pt->queues.new_data = false; + return intel_pt_setup_queues(pt); + } + return 0; +} + +static int intel_pt_process_queues(struct intel_pt *pt, u64 timestamp) +{ + unsigned int queue_nr; + u64 ts; + int ret; + + while (1) { + struct auxtrace_queue *queue; + struct intel_pt_queue *ptq; + + if (!pt->heap.heap_cnt) + return 0; + + if (pt->heap.heap_array[0].ordinal >= timestamp) + return 0; + + queue_nr = pt->heap.heap_array[0].queue_nr; + queue = &pt->queues.queue_array[queue_nr]; + ptq = queue->priv; + + intel_pt_log("queue %u processing 0x%" PRIx64 " to 0x%" PRIx64 "\n", + queue_nr, pt->heap.heap_array[0].ordinal, + timestamp); + + auxtrace_heap__pop(&pt->heap); + + if (pt->heap.heap_cnt) { + ts = pt->heap.heap_array[0].ordinal + 1; + if (ts > timestamp) + ts = timestamp; + } else { + ts = timestamp; + } + + intel_pt_set_pid_tid_cpu(pt, queue); + + ret = intel_pt_run_decoder(ptq, &ts); + + if (ret < 0) { + auxtrace_heap__add(&pt->heap, queue_nr, ts); + return ret; + } + + if (!ret) { + ret = auxtrace_heap__add(&pt->heap, queue_nr, ts); + if (ret < 0) + return ret; + } else { + ptq->on_heap = false; + } + } + + return 0; +} + +static int intel_pt_process_timeless_queues(struct intel_pt *pt, pid_t tid, + u64 time_) +{ + struct auxtrace_queues *queues = &pt->queues; + unsigned int i; + u64 ts = 0; + + for (i = 0; i < queues->nr_queues; i++) { + struct auxtrace_queue *queue = &pt->queues.queue_array[i]; + struct intel_pt_queue *ptq = queue->priv; + + if (ptq && (tid == -1 || ptq->tid == tid)) { + ptq->time = time_; + intel_pt_set_pid_tid_cpu(pt, queue); + intel_pt_run_decoder(ptq, &ts); + } + } + return 0; +} + +static void intel_pt_sample_set_pid_tid_cpu(struct intel_pt_queue *ptq, + struct auxtrace_queue *queue, + struct perf_sample *sample) +{ + struct machine *m = ptq->pt->machine; + + ptq->pid = sample->pid; + ptq->tid = sample->tid; + ptq->cpu = queue->cpu; + + intel_pt_log("queue %u cpu %d pid %d tid %d\n", + ptq->queue_nr, ptq->cpu, ptq->pid, ptq->tid); + + thread__zput(ptq->thread); + + if (ptq->tid == -1) + return; + + if (ptq->pid == -1) { + ptq->thread = machine__find_thread(m, -1, ptq->tid); + if (ptq->thread) + ptq->pid = ptq->thread->pid_; + return; + } + + ptq->thread = machine__findnew_thread(m, ptq->pid, ptq->tid); +} + +static int intel_pt_process_timeless_sample(struct intel_pt *pt, + struct perf_sample *sample) +{ + struct auxtrace_queue *queue; + struct intel_pt_queue *ptq; + u64 ts = 0; + + queue = auxtrace_queues__sample_queue(&pt->queues, sample, pt->session); + if (!queue) + return -EINVAL; + + ptq = queue->priv; + if (!ptq) + return 0; + + ptq->stop = false; + ptq->time = sample->time; + intel_pt_sample_set_pid_tid_cpu(ptq, queue, sample); + intel_pt_run_decoder(ptq, &ts); + return 0; +} + +static int intel_pt_lost(struct intel_pt *pt, struct perf_sample *sample) +{ + return intel_pt_synth_error(pt, INTEL_PT_ERR_LOST, sample->cpu, + sample->pid, sample->tid, 0, sample->time); +} + +static struct intel_pt_queue *intel_pt_cpu_to_ptq(struct intel_pt *pt, int cpu) +{ + unsigned i, j; + + if (cpu < 0 || !pt->queues.nr_queues) + return NULL; + + if ((unsigned)cpu >= pt->queues.nr_queues) + i = pt->queues.nr_queues - 1; + else + i = cpu; + + if (pt->queues.queue_array[i].cpu == cpu) + return pt->queues.queue_array[i].priv; + + for (j = 0; i > 0; j++) { + if (pt->queues.queue_array[--i].cpu == cpu) + return pt->queues.queue_array[i].priv; + } + + for (; j < pt->queues.nr_queues; j++) { + if (pt->queues.queue_array[j].cpu == cpu) + return pt->queues.queue_array[j].priv; + } + + return NULL; +} + +static int intel_pt_sync_switch(struct intel_pt *pt, int cpu, pid_t tid, + u64 timestamp) +{ + struct intel_pt_queue *ptq; + int err; + + if (!pt->sync_switch) + return 1; + + ptq = intel_pt_cpu_to_ptq(pt, cpu); + if (!ptq || !ptq->sync_switch) + return 1; + + switch (ptq->switch_state) { + case INTEL_PT_SS_NOT_TRACING: + break; + case INTEL_PT_SS_UNKNOWN: + case INTEL_PT_SS_TRACING: + ptq->next_tid = tid; + ptq->switch_state = INTEL_PT_SS_EXPECTING_SWITCH_IP; + return 0; + case INTEL_PT_SS_EXPECTING_SWITCH_EVENT: + if (!ptq->on_heap) { + ptq->timestamp = perf_time_to_tsc(timestamp, + &pt->tc); + err = auxtrace_heap__add(&pt->heap, ptq->queue_nr, + ptq->timestamp); + if (err) + return err; + ptq->on_heap = true; + } + ptq->switch_state = INTEL_PT_SS_TRACING; + break; + case INTEL_PT_SS_EXPECTING_SWITCH_IP: + intel_pt_log("ERROR: cpu %d expecting switch ip\n", cpu); + break; + default: + break; + } + + ptq->next_tid = -1; + + return 1; +} + +static int intel_pt_process_switch(struct intel_pt *pt, + struct perf_sample *sample) +{ + struct evsel *evsel; + pid_t tid; + int cpu, ret; + + evsel = perf_evlist__id2evsel(pt->session->evlist, sample->id); + if (evsel != pt->switch_evsel) + return 0; + + tid = evsel__intval(evsel, sample, "next_pid"); + cpu = sample->cpu; + + intel_pt_log("sched_switch: cpu %d tid %d time %"PRIu64" tsc %#"PRIx64"\n", + cpu, tid, sample->time, perf_time_to_tsc(sample->time, + &pt->tc)); + + ret = intel_pt_sync_switch(pt, cpu, tid, sample->time); + if (ret <= 0) + return ret; + + return machine__set_current_tid(pt->machine, cpu, -1, tid); +} + +static int intel_pt_context_switch_in(struct intel_pt *pt, + struct perf_sample *sample) +{ + pid_t pid = sample->pid; + pid_t tid = sample->tid; + int cpu = sample->cpu; + + if (pt->sync_switch) { + struct intel_pt_queue *ptq; + + ptq = intel_pt_cpu_to_ptq(pt, cpu); + if (ptq && ptq->sync_switch) { + ptq->next_tid = -1; + switch (ptq->switch_state) { + case INTEL_PT_SS_NOT_TRACING: + case INTEL_PT_SS_UNKNOWN: + case INTEL_PT_SS_TRACING: + break; + case INTEL_PT_SS_EXPECTING_SWITCH_EVENT: + case INTEL_PT_SS_EXPECTING_SWITCH_IP: + ptq->switch_state = INTEL_PT_SS_TRACING; + break; + default: + break; + } + } + } + + /* + * If the current tid has not been updated yet, ensure it is now that + * a "switch in" event has occurred. + */ + if (machine__get_current_tid(pt->machine, cpu) == tid) + return 0; + + return machine__set_current_tid(pt->machine, cpu, pid, tid); +} + +static int intel_pt_context_switch(struct intel_pt *pt, union perf_event *event, + struct perf_sample *sample) +{ + bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT; + pid_t pid, tid; + int cpu, ret; + + cpu = sample->cpu; + + if (pt->have_sched_switch == 3) { + if (!out) + return intel_pt_context_switch_in(pt, sample); + if (event->header.type != PERF_RECORD_SWITCH_CPU_WIDE) { + pr_err("Expecting CPU-wide context switch event\n"); + return -EINVAL; + } + pid = event->context_switch.next_prev_pid; + tid = event->context_switch.next_prev_tid; + } else { + if (out) + return 0; + pid = sample->pid; + tid = sample->tid; + } + + if (tid == -1) + intel_pt_log("context_switch event has no tid\n"); + + ret = intel_pt_sync_switch(pt, cpu, tid, sample->time); + if (ret <= 0) + return ret; + + return machine__set_current_tid(pt->machine, cpu, pid, tid); +} + +static int intel_pt_process_itrace_start(struct intel_pt *pt, + union perf_event *event, + struct perf_sample *sample) +{ + if (!pt->per_cpu_mmaps) + return 0; + + intel_pt_log("itrace_start: cpu %d pid %d tid %d time %"PRIu64" tsc %#"PRIx64"\n", + sample->cpu, event->itrace_start.pid, + event->itrace_start.tid, sample->time, + perf_time_to_tsc(sample->time, &pt->tc)); + + return machine__set_current_tid(pt->machine, sample->cpu, + event->itrace_start.pid, + event->itrace_start.tid); +} + +static int intel_pt_find_map(struct thread *thread, u8 cpumode, u64 addr, + struct addr_location *al) +{ + if (!al->map || addr < al->map->start || addr >= al->map->end) { + if (!thread__find_map(thread, cpumode, addr, al)) + return -1; + } + + return 0; +} + +/* Invalidate all instruction cache entries that overlap the text poke */ +static int intel_pt_text_poke(struct intel_pt *pt, union perf_event *event) +{ + u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; + u64 addr = event->text_poke.addr + event->text_poke.new_len - 1; + /* Assume text poke begins in a basic block no more than 4096 bytes */ + int cnt = 4096 + event->text_poke.new_len; + struct thread *thread = pt->unknown_thread; + struct addr_location al = { .map = NULL }; + struct machine *machine = pt->machine; + struct intel_pt_cache_entry *e; + u64 offset; + + if (!event->text_poke.new_len) + return 0; + + for (; cnt; cnt--, addr--) { + if (intel_pt_find_map(thread, cpumode, addr, &al)) { + if (addr < event->text_poke.addr) + return 0; + continue; + } + + if (!al.map->dso || !al.map->dso->auxtrace_cache) + continue; + + offset = al.map->map_ip(al.map, addr); + + e = intel_pt_cache_lookup(al.map->dso, machine, offset); + if (!e) + continue; + + if (addr + e->byte_cnt + e->length <= event->text_poke.addr) { + /* + * No overlap. Working backwards there cannot be another + * basic block that overlaps the text poke if there is a + * branch instruction before the text poke address. + */ + if (e->branch != INTEL_PT_BR_NO_BRANCH) + return 0; + } else { + intel_pt_cache_invalidate(al.map->dso, machine, offset); + intel_pt_log("Invalidated instruction cache for %s at %#"PRIx64"\n", + al.map->dso->long_name, addr); + } + } + + return 0; +} + +static int intel_pt_process_event(struct perf_session *session, + union perf_event *event, + struct perf_sample *sample, + struct perf_tool *tool) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + u64 timestamp; + int err = 0; + + if (dump_trace) + return 0; + + if (!tool->ordered_events) { + pr_err("Intel Processor Trace requires ordered events\n"); + return -EINVAL; + } + + if (sample->time && sample->time != (u64)-1) + timestamp = perf_time_to_tsc(sample->time, &pt->tc); + else + timestamp = 0; + + if (timestamp || pt->timeless_decoding) { + err = intel_pt_update_queues(pt); + if (err) + return err; + } + + if (pt->timeless_decoding) { + if (pt->sampling_mode) { + if (sample->aux_sample.size) + err = intel_pt_process_timeless_sample(pt, + sample); + } else if (event->header.type == PERF_RECORD_EXIT) { + err = intel_pt_process_timeless_queues(pt, + event->fork.tid, + sample->time); + } + } else if (timestamp) { + err = intel_pt_process_queues(pt, timestamp); + } + if (err) + return err; + + if (event->header.type == PERF_RECORD_SAMPLE) { + if (pt->synth_opts.add_callchain && !sample->callchain) + intel_pt_add_callchain(pt, sample); + if (pt->synth_opts.add_last_branch && !sample->branch_stack) + intel_pt_add_br_stack(pt, sample); + } + + if (event->header.type == PERF_RECORD_AUX && + (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) && + pt->synth_opts.errors) { + err = intel_pt_lost(pt, sample); + if (err) + return err; + } + + if (pt->switch_evsel && event->header.type == PERF_RECORD_SAMPLE) + err = intel_pt_process_switch(pt, sample); + else if (event->header.type == PERF_RECORD_ITRACE_START) + err = intel_pt_process_itrace_start(pt, event, sample); + else if (event->header.type == PERF_RECORD_SWITCH || + event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) + err = intel_pt_context_switch(pt, event, sample); + + if (!err && event->header.type == PERF_RECORD_TEXT_POKE) + err = intel_pt_text_poke(pt, event); + + if (intel_pt_enable_logging && intel_pt_log_events(pt, sample->time)) { + intel_pt_log("event %u: cpu %d time %"PRIu64" tsc %#"PRIx64" ", + event->header.type, sample->cpu, sample->time, timestamp); + intel_pt_log_event(event); + } + + return err; +} + +static int intel_pt_flush(struct perf_session *session, struct perf_tool *tool) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + int ret; + + if (dump_trace) + return 0; + + if (!tool->ordered_events) + return -EINVAL; + + ret = intel_pt_update_queues(pt); + if (ret < 0) + return ret; + + if (pt->timeless_decoding) + return intel_pt_process_timeless_queues(pt, -1, + MAX_TIMESTAMP - 1); + + return intel_pt_process_queues(pt, MAX_TIMESTAMP); +} + +static void intel_pt_free_events(struct perf_session *session) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + struct auxtrace_queues *queues = &pt->queues; + unsigned int i; + + for (i = 0; i < queues->nr_queues; i++) { + intel_pt_free_queue(queues->queue_array[i].priv); + queues->queue_array[i].priv = NULL; + } + intel_pt_log_disable(); + auxtrace_queues__free(queues); +} + +static void intel_pt_free(struct perf_session *session) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + + auxtrace_heap__free(&pt->heap); + intel_pt_free_events(session); + session->auxtrace = NULL; + thread__put(pt->unknown_thread); + addr_filters__exit(&pt->filts); + zfree(&pt->chain); + zfree(&pt->filter); + zfree(&pt->time_ranges); + free(pt); +} + +static bool intel_pt_evsel_is_auxtrace(struct perf_session *session, + struct evsel *evsel) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + + return evsel->core.attr.type == pt->pmu_type; +} + +static int intel_pt_process_auxtrace_event(struct perf_session *session, + union perf_event *event, + struct perf_tool *tool __maybe_unused) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + + if (!pt->data_queued) { + struct auxtrace_buffer *buffer; + off_t data_offset; + int fd = perf_data__fd(session->data); + int err; + + if (perf_data__is_pipe(session->data)) { + data_offset = 0; + } else { + data_offset = lseek(fd, 0, SEEK_CUR); + if (data_offset == -1) + return -errno; + } + + err = auxtrace_queues__add_event(&pt->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_pt_dump_event(pt, buffer->data, + buffer->size); + auxtrace_buffer__put_data(buffer); + } + } + } + + return 0; +} + +static int intel_pt_queue_data(struct perf_session *session, + struct perf_sample *sample, + union perf_event *event, u64 data_offset) +{ + struct intel_pt *pt = container_of(session->auxtrace, struct intel_pt, + auxtrace); + u64 timestamp; + + if (event) { + return auxtrace_queues__add_event(&pt->queues, session, event, + data_offset, NULL); + } + + if (sample->time && sample->time != (u64)-1) + timestamp = perf_time_to_tsc(sample->time, &pt->tc); + else + timestamp = 0; + + return auxtrace_queues__add_sample(&pt->queues, session, sample, + data_offset, timestamp); +} + +struct intel_pt_synth { + struct perf_tool dummy_tool; + struct perf_session *session; +}; + +static int intel_pt_event_synth(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + struct intel_pt_synth *intel_pt_synth = + container_of(tool, struct intel_pt_synth, dummy_tool); + + return perf_session__deliver_synth_event(intel_pt_synth->session, event, + NULL); +} + +static int intel_pt_synth_event(struct perf_session *session, const char *name, + struct perf_event_attr *attr, u64 id) +{ + struct intel_pt_synth intel_pt_synth; + int err; + + pr_debug("Synthesizing '%s' event with id %" PRIu64 " sample type %#" PRIx64 "\n", + name, id, (u64)attr->sample_type); + + memset(&intel_pt_synth, 0, sizeof(struct intel_pt_synth)); + intel_pt_synth.session = session; + + err = perf_event__synthesize_attr(&intel_pt_synth.dummy_tool, attr, 1, + &id, intel_pt_event_synth); + if (err) + pr_err("%s: failed to synthesize '%s' event type\n", + __func__, name); + + return err; +} + +static void intel_pt_set_event_name(struct evlist *evlist, u64 id, + const char *name) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.id && evsel->core.id[0] == id) { + if (evsel->name) + zfree(&evsel->name); + evsel->name = strdup(name); + break; + } + } +} + +static struct evsel *intel_pt_evsel(struct intel_pt *pt, + struct evlist *evlist) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.attr.type == pt->pmu_type && evsel->core.ids) + return evsel; + } + + return NULL; +} + +static int intel_pt_synth_events(struct intel_pt *pt, + struct perf_session *session) +{ + struct evlist *evlist = session->evlist; + struct evsel *evsel = intel_pt_evsel(pt, evlist); + struct perf_event_attr attr; + u64 id; + int err; + + if (!evsel) { + pr_debug("There are no selected events with Intel Processor Trace 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->core.attr.sample_type & PERF_SAMPLE_MASK; + attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID | + PERF_SAMPLE_PERIOD; + if (pt->timeless_decoding) + attr.sample_type &= ~(u64)PERF_SAMPLE_TIME; + else + attr.sample_type |= PERF_SAMPLE_TIME; + if (!pt->per_cpu_mmaps) + attr.sample_type &= ~(u64)PERF_SAMPLE_CPU; + attr.exclude_user = evsel->core.attr.exclude_user; + attr.exclude_kernel = evsel->core.attr.exclude_kernel; + attr.exclude_hv = evsel->core.attr.exclude_hv; + attr.exclude_host = evsel->core.attr.exclude_host; + attr.exclude_guest = evsel->core.attr.exclude_guest; + attr.sample_id_all = evsel->core.attr.sample_id_all; + attr.read_format = evsel->core.attr.read_format; + + id = evsel->core.id[0] + 1000000000; + if (!id) + id = 1; + + if (pt->synth_opts.branches) { + attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; + attr.sample_period = 1; + attr.sample_type |= PERF_SAMPLE_ADDR; + err = intel_pt_synth_event(session, "branches", &attr, id); + if (err) + return err; + pt->sample_branches = true; + pt->branches_sample_type = attr.sample_type; + pt->branches_id = id; + id += 1; + attr.sample_type &= ~(u64)PERF_SAMPLE_ADDR; + } + + if (pt->synth_opts.callchain) + attr.sample_type |= PERF_SAMPLE_CALLCHAIN; + if (pt->synth_opts.last_branch) { + attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; + /* + * We don't use the hardware index, but the sample generation + * code uses the new format branch_stack with this field, + * so the event attributes must indicate that it's present. + */ + attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX; + } + + if (pt->synth_opts.instructions) { + attr.config = PERF_COUNT_HW_INSTRUCTIONS; + if (pt->synth_opts.period_type == PERF_ITRACE_PERIOD_NANOSECS) + attr.sample_period = + intel_pt_ns_to_ticks(pt, pt->synth_opts.period); + else + attr.sample_period = pt->synth_opts.period; + err = intel_pt_synth_event(session, "instructions", &attr, id); + if (err) + return err; + pt->sample_instructions = true; + pt->instructions_sample_type = attr.sample_type; + pt->instructions_id = id; + id += 1; + } + + attr.sample_type &= ~(u64)PERF_SAMPLE_PERIOD; + attr.sample_period = 1; + + if (pt->synth_opts.transactions) { + attr.config = PERF_COUNT_HW_INSTRUCTIONS; + err = intel_pt_synth_event(session, "transactions", &attr, id); + if (err) + return err; + pt->sample_transactions = true; + pt->transactions_sample_type = attr.sample_type; + pt->transactions_id = id; + intel_pt_set_event_name(evlist, id, "transactions"); + id += 1; + } + + attr.type = PERF_TYPE_SYNTH; + attr.sample_type |= PERF_SAMPLE_RAW; + + if (pt->synth_opts.ptwrites) { + attr.config = PERF_SYNTH_INTEL_PTWRITE; + err = intel_pt_synth_event(session, "ptwrite", &attr, id); + if (err) + return err; + pt->sample_ptwrites = true; + pt->ptwrites_sample_type = attr.sample_type; + pt->ptwrites_id = id; + intel_pt_set_event_name(evlist, id, "ptwrite"); + id += 1; + } + + if (pt->synth_opts.pwr_events) { + pt->sample_pwr_events = true; + pt->pwr_events_sample_type = attr.sample_type; + + attr.config = PERF_SYNTH_INTEL_CBR; + err = intel_pt_synth_event(session, "cbr", &attr, id); + if (err) + return err; + pt->cbr_id = id; + intel_pt_set_event_name(evlist, id, "cbr"); + id += 1; + } + + if (pt->synth_opts.pwr_events && (evsel->core.attr.config & 0x10)) { + attr.config = PERF_SYNTH_INTEL_MWAIT; + err = intel_pt_synth_event(session, "mwait", &attr, id); + if (err) + return err; + pt->mwait_id = id; + intel_pt_set_event_name(evlist, id, "mwait"); + id += 1; + + attr.config = PERF_SYNTH_INTEL_PWRE; + err = intel_pt_synth_event(session, "pwre", &attr, id); + if (err) + return err; + pt->pwre_id = id; + intel_pt_set_event_name(evlist, id, "pwre"); + id += 1; + + attr.config = PERF_SYNTH_INTEL_EXSTOP; + err = intel_pt_synth_event(session, "exstop", &attr, id); + if (err) + return err; + pt->exstop_id = id; + intel_pt_set_event_name(evlist, id, "exstop"); + id += 1; + + attr.config = PERF_SYNTH_INTEL_PWRX; + err = intel_pt_synth_event(session, "pwrx", &attr, id); + if (err) + return err; + pt->pwrx_id = id; + intel_pt_set_event_name(evlist, id, "pwrx"); + id += 1; + } + + return 0; +} + +static void intel_pt_setup_pebs_events(struct intel_pt *pt) +{ + struct evsel *evsel; + + if (!pt->synth_opts.other_events) + return; + + evlist__for_each_entry(pt->session->evlist, evsel) { + if (evsel->core.attr.aux_output && evsel->core.id) { + pt->sample_pebs = true; + pt->pebs_evsel = evsel; + return; + } + } +} + +static struct evsel *intel_pt_find_sched_switch(struct evlist *evlist) +{ + struct evsel *evsel; + + evlist__for_each_entry_reverse(evlist, evsel) { + const char *name = evsel__name(evsel); + + if (!strcmp(name, "sched:sched_switch")) + return evsel; + } + + return NULL; +} + +static bool intel_pt_find_switch(struct evlist *evlist) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.attr.context_switch) + return true; + } + + return false; +} + +static int intel_pt_perf_config(const char *var, const char *value, void *data) +{ + struct intel_pt *pt = data; + + if (!strcmp(var, "intel-pt.mispred-all")) + pt->mispred_all = perf_config_bool(var, value); + + return 0; +} + +/* Find least TSC which converts to ns or later */ +static u64 intel_pt_tsc_start(u64 ns, struct intel_pt *pt) +{ + u64 tsc, tm; + + tsc = perf_time_to_tsc(ns, &pt->tc); + + while (1) { + tm = tsc_to_perf_time(tsc, &pt->tc); + if (tm < ns) + break; + tsc -= 1; + } + + while (tm < ns) + tm = tsc_to_perf_time(++tsc, &pt->tc); + + return tsc; +} + +/* Find greatest TSC which converts to ns or earlier */ +static u64 intel_pt_tsc_end(u64 ns, struct intel_pt *pt) +{ + u64 tsc, tm; + + tsc = perf_time_to_tsc(ns, &pt->tc); + + while (1) { + tm = tsc_to_perf_time(tsc, &pt->tc); + if (tm > ns) + break; + tsc += 1; + } + + while (tm > ns) + tm = tsc_to_perf_time(--tsc, &pt->tc); + + return tsc; +} + +static int intel_pt_setup_time_ranges(struct intel_pt *pt, + struct itrace_synth_opts *opts) +{ + struct perf_time_interval *p = opts->ptime_range; + int n = opts->range_num; + int i; + + if (!n || !p || pt->timeless_decoding) + return 0; + + pt->time_ranges = calloc(n, sizeof(struct range)); + if (!pt->time_ranges) + return -ENOMEM; + + pt->range_cnt = n; + + intel_pt_log("%s: %u range(s)\n", __func__, n); + + for (i = 0; i < n; i++) { + struct range *r = &pt->time_ranges[i]; + u64 ts = p[i].start; + u64 te = p[i].end; + + /* + * Take care to ensure the TSC range matches the perf-time range + * when converted back to perf-time. + */ + r->start = ts ? intel_pt_tsc_start(ts, pt) : 0; + r->end = te ? intel_pt_tsc_end(te, pt) : 0; + + intel_pt_log("range %d: perf time interval: %"PRIu64" to %"PRIu64"\n", + i, ts, te); + intel_pt_log("range %d: TSC time interval: %#"PRIx64" to %#"PRIx64"\n", + i, r->start, r->end); + } + + return 0; +} + +static const char * const intel_pt_info_fmts[] = { + [INTEL_PT_PMU_TYPE] = " PMU Type %"PRId64"\n", + [INTEL_PT_TIME_SHIFT] = " Time Shift %"PRIu64"\n", + [INTEL_PT_TIME_MULT] = " Time Muliplier %"PRIu64"\n", + [INTEL_PT_TIME_ZERO] = " Time Zero %"PRIu64"\n", + [INTEL_PT_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n", + [INTEL_PT_TSC_BIT] = " TSC bit %#"PRIx64"\n", + [INTEL_PT_NORETCOMP_BIT] = " NoRETComp bit %#"PRIx64"\n", + [INTEL_PT_HAVE_SCHED_SWITCH] = " Have sched_switch %"PRId64"\n", + [INTEL_PT_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n", + [INTEL_PT_PER_CPU_MMAPS] = " Per-cpu maps %"PRId64"\n", + [INTEL_PT_MTC_BIT] = " MTC bit %#"PRIx64"\n", + [INTEL_PT_MTC_FREQ_BITS] = " MTC freq bits %#"PRIx64"\n", + [INTEL_PT_TSC_CTC_N] = " TSC:CTC numerator %"PRIu64"\n", + [INTEL_PT_TSC_CTC_D] = " TSC:CTC denominator %"PRIu64"\n", + [INTEL_PT_CYC_BIT] = " CYC bit %#"PRIx64"\n", + [INTEL_PT_MAX_NONTURBO_RATIO] = " Max non-turbo ratio %"PRIu64"\n", + [INTEL_PT_FILTER_STR_LEN] = " Filter string len. %"PRIu64"\n", +}; + +static void intel_pt_print_info(__u64 *arr, int start, int finish) +{ + int i; + + if (!dump_trace) + return; + + for (i = start; i <= finish; i++) { + const char *fmt = intel_pt_info_fmts[i]; + + if (fmt) + fprintf(stdout, fmt, arr[i]); + } +} + +static void intel_pt_print_info_str(const char *name, const char *str) +{ + if (!dump_trace) + return; + + fprintf(stdout, " %-20s%s\n", name, str ? str : ""); +} + +static bool intel_pt_has(struct perf_record_auxtrace_info *auxtrace_info, int pos) +{ + return auxtrace_info->header.size >= + sizeof(struct perf_record_auxtrace_info) + (sizeof(u64) * (pos + 1)); +} + +int intel_pt_process_auxtrace_info(union perf_event *event, + struct perf_session *session) +{ + struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info; + size_t min_sz = sizeof(u64) * INTEL_PT_PER_CPU_MMAPS; + struct intel_pt *pt; + void *info_end; + __u64 *info; + int err; + + if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) + + min_sz) + return -EINVAL; + + pt = zalloc(sizeof(struct intel_pt)); + if (!pt) + return -ENOMEM; + + addr_filters__init(&pt->filts); + + err = perf_config(intel_pt_perf_config, pt); + if (err) + goto err_free; + + err = auxtrace_queues__init(&pt->queues); + if (err) + goto err_free; + + intel_pt_log_set_name(INTEL_PT_PMU_NAME); + + pt->session = session; + pt->machine = &session->machines.host; /* No kvm support */ + pt->auxtrace_type = auxtrace_info->type; + pt->pmu_type = auxtrace_info->priv[INTEL_PT_PMU_TYPE]; + pt->tc.time_shift = auxtrace_info->priv[INTEL_PT_TIME_SHIFT]; + pt->tc.time_mult = auxtrace_info->priv[INTEL_PT_TIME_MULT]; + pt->tc.time_zero = auxtrace_info->priv[INTEL_PT_TIME_ZERO]; + pt->cap_user_time_zero = auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO]; + pt->tsc_bit = auxtrace_info->priv[INTEL_PT_TSC_BIT]; + pt->noretcomp_bit = auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT]; + pt->have_sched_switch = auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH]; + pt->snapshot_mode = auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE]; + pt->per_cpu_mmaps = auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS]; + intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_PMU_TYPE, + INTEL_PT_PER_CPU_MMAPS); + + if (intel_pt_has(auxtrace_info, INTEL_PT_CYC_BIT)) { + pt->mtc_bit = auxtrace_info->priv[INTEL_PT_MTC_BIT]; + pt->mtc_freq_bits = auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS]; + pt->tsc_ctc_ratio_n = auxtrace_info->priv[INTEL_PT_TSC_CTC_N]; + pt->tsc_ctc_ratio_d = auxtrace_info->priv[INTEL_PT_TSC_CTC_D]; + pt->cyc_bit = auxtrace_info->priv[INTEL_PT_CYC_BIT]; + intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_MTC_BIT, + INTEL_PT_CYC_BIT); + } + + if (intel_pt_has(auxtrace_info, INTEL_PT_MAX_NONTURBO_RATIO)) { + pt->max_non_turbo_ratio = + auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO]; + intel_pt_print_info(&auxtrace_info->priv[0], + INTEL_PT_MAX_NONTURBO_RATIO, + INTEL_PT_MAX_NONTURBO_RATIO); + } + + info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1; + info_end = (void *)info + auxtrace_info->header.size; + + if (intel_pt_has(auxtrace_info, INTEL_PT_FILTER_STR_LEN)) { + size_t len; + + len = auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN]; + intel_pt_print_info(&auxtrace_info->priv[0], + INTEL_PT_FILTER_STR_LEN, + INTEL_PT_FILTER_STR_LEN); + if (len) { + const char *filter = (const char *)info; + + len = roundup(len + 1, 8); + info += len >> 3; + if ((void *)info > info_end) { + pr_err("%s: bad filter string length\n", __func__); + err = -EINVAL; + goto err_free_queues; + } + pt->filter = memdup(filter, len); + if (!pt->filter) { + err = -ENOMEM; + goto err_free_queues; + } + if (session->header.needs_swap) + mem_bswap_64(pt->filter, len); + if (pt->filter[len - 1]) { + pr_err("%s: filter string not null terminated\n", __func__); + err = -EINVAL; + goto err_free_queues; + } + err = addr_filters__parse_bare_filter(&pt->filts, + filter); + if (err) + goto err_free_queues; + } + intel_pt_print_info_str("Filter string", pt->filter); + } + + pt->timeless_decoding = intel_pt_timeless_decoding(pt); + if (pt->timeless_decoding && !pt->tc.time_mult) + pt->tc.time_mult = 1; + pt->have_tsc = intel_pt_have_tsc(pt); + pt->sampling_mode = intel_pt_sampling_mode(pt); + pt->est_tsc = !pt->timeless_decoding; + + pt->unknown_thread = thread__new(999999999, 999999999); + if (!pt->unknown_thread) { + err = -ENOMEM; + goto err_free_queues; + } + + /* + * Since this thread will not be kept in any rbtree not in a + * list, initialize its list node so that at thread__put() the + * current thread lifetime assuption is kept and we don't segfault + * at list_del_init(). + */ + INIT_LIST_HEAD(&pt->unknown_thread->node); + + err = thread__set_comm(pt->unknown_thread, "unknown", 0); + if (err) + goto err_delete_thread; + if (thread__init_maps(pt->unknown_thread, pt->machine)) { + err = -ENOMEM; + goto err_delete_thread; + } + + pt->auxtrace.process_event = intel_pt_process_event; + pt->auxtrace.process_auxtrace_event = intel_pt_process_auxtrace_event; + pt->auxtrace.queue_data = intel_pt_queue_data; + pt->auxtrace.dump_auxtrace_sample = intel_pt_dump_sample; + pt->auxtrace.flush_events = intel_pt_flush; + pt->auxtrace.free_events = intel_pt_free_events; + pt->auxtrace.free = intel_pt_free; + pt->auxtrace.evsel_is_auxtrace = intel_pt_evsel_is_auxtrace; + session->auxtrace = &pt->auxtrace; + + if (dump_trace) + return 0; + + if (pt->have_sched_switch == 1) { + pt->switch_evsel = intel_pt_find_sched_switch(session->evlist); + if (!pt->switch_evsel) { + pr_err("%s: missing sched_switch event\n", __func__); + err = -EINVAL; + goto err_delete_thread; + } + } else if (pt->have_sched_switch == 2 && + !intel_pt_find_switch(session->evlist)) { + pr_err("%s: missing context_switch attribute flag\n", __func__); + err = -EINVAL; + goto err_delete_thread; + } + + if (session->itrace_synth_opts->set) { + pt->synth_opts = *session->itrace_synth_opts; + } else { + itrace_synth_opts__set_default(&pt->synth_opts, + session->itrace_synth_opts->default_no_sample); + if (!session->itrace_synth_opts->default_no_sample && + !session->itrace_synth_opts->inject) { + pt->synth_opts.branches = false; + pt->synth_opts.callchain = true; + pt->synth_opts.add_callchain = true; + } + pt->synth_opts.thread_stack = + session->itrace_synth_opts->thread_stack; + } + + if (pt->synth_opts.log) + intel_pt_log_enable(); + + /* Maximum non-turbo ratio is TSC freq / 100 MHz */ + if (pt->tc.time_mult) { + u64 tsc_freq = intel_pt_ns_to_ticks(pt, 1000000000); + + if (!pt->max_non_turbo_ratio) + pt->max_non_turbo_ratio = + (tsc_freq + 50000000) / 100000000; + intel_pt_log("TSC frequency %"PRIu64"\n", tsc_freq); + intel_pt_log("Maximum non-turbo ratio %u\n", + pt->max_non_turbo_ratio); + pt->cbr2khz = tsc_freq / pt->max_non_turbo_ratio / 1000; + } + + err = intel_pt_setup_time_ranges(pt, session->itrace_synth_opts); + if (err) + goto err_delete_thread; + + if (pt->synth_opts.calls) + pt->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC | + PERF_IP_FLAG_TRACE_END; + if (pt->synth_opts.returns) + pt->branches_filter |= PERF_IP_FLAG_RETURN | + PERF_IP_FLAG_TRACE_BEGIN; + + if ((pt->synth_opts.callchain || pt->synth_opts.add_callchain) && + !symbol_conf.use_callchain) { + symbol_conf.use_callchain = true; + if (callchain_register_param(&callchain_param) < 0) { + symbol_conf.use_callchain = false; + pt->synth_opts.callchain = false; + pt->synth_opts.add_callchain = false; + } + } + + if (pt->synth_opts.add_callchain) { + err = intel_pt_callchain_init(pt); + if (err) + goto err_delete_thread; + } + + if (pt->synth_opts.last_branch || pt->synth_opts.add_last_branch) { + pt->br_stack_sz = pt->synth_opts.last_branch_sz; + pt->br_stack_sz_plus = pt->br_stack_sz; + } + + if (pt->synth_opts.add_last_branch) { + err = intel_pt_br_stack_init(pt); + if (err) + goto err_delete_thread; + /* + * Additional branch stack size to cater for tracing from the + * actual sample ip to where the sample time is recorded. + * Measured at about 200 branches, but generously set to 1024. + * If kernel space is not being traced, then add just 1 for the + * branch to kernel space. + */ + if (intel_pt_tracing_kernel(pt)) + pt->br_stack_sz_plus += 1024; + else + pt->br_stack_sz_plus += 1; + } + + pt->use_thread_stack = pt->synth_opts.callchain || + pt->synth_opts.add_callchain || + pt->synth_opts.thread_stack || + pt->synth_opts.last_branch || + pt->synth_opts.add_last_branch; + + pt->callstack = pt->synth_opts.callchain || + pt->synth_opts.add_callchain || + pt->synth_opts.thread_stack; + + err = intel_pt_synth_events(pt, session); + if (err) + goto err_delete_thread; + + intel_pt_setup_pebs_events(pt); + + if (pt->sampling_mode || list_empty(&session->auxtrace_index)) + err = auxtrace_queue_data(session, true, true); + else + err = auxtrace_queues__process_index(&pt->queues, session); + if (err) + goto err_delete_thread; + + if (pt->queues.populated) + pt->data_queued = true; + + if (pt->timeless_decoding) + pr_debug2("Intel PT decoding without timestamps\n"); + + return 0; + +err_delete_thread: + zfree(&pt->chain); + thread__zput(pt->unknown_thread); +err_free_queues: + intel_pt_log_disable(); + auxtrace_queues__free(&pt->queues); + session->auxtrace = NULL; +err_free: + addr_filters__exit(&pt->filts); + zfree(&pt->filter); + zfree(&pt->time_ranges); + free(pt); + return err; +} |