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- // 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_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++)
- fprintf(stdout, intel_pt_info_fmts[i], 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;
- }
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