diff options
Diffstat (limited to 'tools/perf/builtin-kvm.c')
| -rw-r--r-- | tools/perf/builtin-kvm.c | 1653 |
1 files changed, 1653 insertions, 0 deletions
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c new file mode 100644 index 000000000..460945ded --- /dev/null +++ b/tools/perf/builtin-kvm.c @@ -0,0 +1,1653 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "builtin.h" +#include "perf.h" + +#include "util/build-id.h" +#include "util/evsel.h" +#include "util/evlist.h" +#include "util/mmap.h" +#include "util/term.h" +#include "util/symbol.h" +#include "util/thread.h" +#include "util/header.h" +#include "util/session.h" +#include "util/intlist.h" +#include <subcmd/pager.h> +#include <subcmd/parse-options.h> +#include "util/trace-event.h" +#include "util/debug.h" +#include "util/tool.h" +#include "util/stat.h" +#include "util/synthetic-events.h" +#include "util/top.h" +#include "util/data.h" +#include "util/ordered-events.h" +#include "util/kvm-stat.h" +#include "ui/ui.h" + +#include <sys/prctl.h> +#ifdef HAVE_TIMERFD_SUPPORT +#include <sys/timerfd.h> +#endif +#include <sys/time.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/time64.h> +#include <linux/zalloc.h> +#include <errno.h> +#include <inttypes.h> +#include <poll.h> +#include <termios.h> +#include <semaphore.h> +#include <signal.h> +#include <math.h> +#include <perf/mmap.h> + +static const char *get_filename_for_perf_kvm(void) +{ + const char *filename; + + if (perf_host && !perf_guest) + filename = strdup("perf.data.host"); + else if (!perf_host && perf_guest) + filename = strdup("perf.data.guest"); + else + filename = strdup("perf.data.kvm"); + + return filename; +} + +#ifdef HAVE_KVM_STAT_SUPPORT + +void exit_event_get_key(struct evsel *evsel, + struct perf_sample *sample, + struct event_key *key) +{ + key->info = 0; + key->key = evsel__intval(evsel, sample, kvm_exit_reason); +} + +bool kvm_exit_event(struct evsel *evsel) +{ + return !strcmp(evsel->name, kvm_exit_trace); +} + +bool exit_event_begin(struct evsel *evsel, + struct perf_sample *sample, struct event_key *key) +{ + if (kvm_exit_event(evsel)) { + exit_event_get_key(evsel, sample, key); + return true; + } + + return false; +} + +bool kvm_entry_event(struct evsel *evsel) +{ + return !strcmp(evsel->name, kvm_entry_trace); +} + +bool exit_event_end(struct evsel *evsel, + struct perf_sample *sample __maybe_unused, + struct event_key *key __maybe_unused) +{ + return kvm_entry_event(evsel); +} + +static const char *get_exit_reason(struct perf_kvm_stat *kvm, + struct exit_reasons_table *tbl, + u64 exit_code) +{ + while (tbl->reason != NULL) { + if (tbl->exit_code == exit_code) + return tbl->reason; + tbl++; + } + + pr_err("unknown kvm exit code:%lld on %s\n", + (unsigned long long)exit_code, kvm->exit_reasons_isa); + return "UNKNOWN"; +} + +void exit_event_decode_key(struct perf_kvm_stat *kvm, + struct event_key *key, + char *decode) +{ + const char *exit_reason = get_exit_reason(kvm, key->exit_reasons, + key->key); + + scnprintf(decode, decode_str_len, "%s", exit_reason); +} + +static bool register_kvm_events_ops(struct perf_kvm_stat *kvm) +{ + struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops; + + for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) { + if (!strcmp(events_ops->name, kvm->report_event)) { + kvm->events_ops = events_ops->ops; + return true; + } + } + + return false; +} + +struct vcpu_event_record { + int vcpu_id; + u64 start_time; + struct kvm_event *last_event; +}; + + +static void init_kvm_event_record(struct perf_kvm_stat *kvm) +{ + unsigned int i; + + for (i = 0; i < EVENTS_CACHE_SIZE; i++) + INIT_LIST_HEAD(&kvm->kvm_events_cache[i]); +} + +#ifdef HAVE_TIMERFD_SUPPORT +static void clear_events_cache_stats(struct list_head *kvm_events_cache) +{ + struct list_head *head; + struct kvm_event *event; + unsigned int i; + int j; + + for (i = 0; i < EVENTS_CACHE_SIZE; i++) { + head = &kvm_events_cache[i]; + list_for_each_entry(event, head, hash_entry) { + /* reset stats for event */ + event->total.time = 0; + init_stats(&event->total.stats); + + for (j = 0; j < event->max_vcpu; ++j) { + event->vcpu[j].time = 0; + init_stats(&event->vcpu[j].stats); + } + } + } +} +#endif + +static int kvm_events_hash_fn(u64 key) +{ + return key & (EVENTS_CACHE_SIZE - 1); +} + +static bool kvm_event_expand(struct kvm_event *event, int vcpu_id) +{ + int old_max_vcpu = event->max_vcpu; + void *prev; + + if (vcpu_id < event->max_vcpu) + return true; + + while (event->max_vcpu <= vcpu_id) + event->max_vcpu += DEFAULT_VCPU_NUM; + + prev = event->vcpu; + event->vcpu = realloc(event->vcpu, + event->max_vcpu * sizeof(*event->vcpu)); + if (!event->vcpu) { + free(prev); + pr_err("Not enough memory\n"); + return false; + } + + memset(event->vcpu + old_max_vcpu, 0, + (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu)); + return true; +} + +static struct kvm_event *kvm_alloc_init_event(struct event_key *key) +{ + struct kvm_event *event; + + event = zalloc(sizeof(*event)); + if (!event) { + pr_err("Not enough memory\n"); + return NULL; + } + + event->key = *key; + init_stats(&event->total.stats); + return event; +} + +static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm, + struct event_key *key) +{ + struct kvm_event *event; + struct list_head *head; + + BUG_ON(key->key == INVALID_KEY); + + head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)]; + list_for_each_entry(event, head, hash_entry) { + if (event->key.key == key->key && event->key.info == key->info) + return event; + } + + event = kvm_alloc_init_event(key); + if (!event) + return NULL; + + list_add(&event->hash_entry, head); + return event; +} + +static bool handle_begin_event(struct perf_kvm_stat *kvm, + struct vcpu_event_record *vcpu_record, + struct event_key *key, u64 timestamp) +{ + struct kvm_event *event = NULL; + + if (key->key != INVALID_KEY) + event = find_create_kvm_event(kvm, key); + + vcpu_record->last_event = event; + vcpu_record->start_time = timestamp; + return true; +} + +static void +kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff) +{ + kvm_stats->time += time_diff; + update_stats(&kvm_stats->stats, time_diff); +} + +static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event) +{ + struct kvm_event_stats *kvm_stats = &event->total; + + if (vcpu_id != -1) + kvm_stats = &event->vcpu[vcpu_id]; + + return rel_stddev_stats(stddev_stats(&kvm_stats->stats), + avg_stats(&kvm_stats->stats)); +} + +static bool update_kvm_event(struct kvm_event *event, int vcpu_id, + u64 time_diff) +{ + if (vcpu_id == -1) { + kvm_update_event_stats(&event->total, time_diff); + return true; + } + + if (!kvm_event_expand(event, vcpu_id)) + return false; + + kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff); + return true; +} + +static bool is_child_event(struct perf_kvm_stat *kvm, + struct evsel *evsel, + struct perf_sample *sample, + struct event_key *key) +{ + struct child_event_ops *child_ops; + + child_ops = kvm->events_ops->child_ops; + + if (!child_ops) + return false; + + for (; child_ops->name; child_ops++) { + if (!strcmp(evsel->name, child_ops->name)) { + child_ops->get_key(evsel, sample, key); + return true; + } + } + + return false; +} + +static bool handle_child_event(struct perf_kvm_stat *kvm, + struct vcpu_event_record *vcpu_record, + struct event_key *key, + struct perf_sample *sample __maybe_unused) +{ + struct kvm_event *event = NULL; + + if (key->key != INVALID_KEY) + event = find_create_kvm_event(kvm, key); + + vcpu_record->last_event = event; + + return true; +} + +static bool skip_event(const char *event) +{ + const char * const *skip_events; + + for (skip_events = kvm_skip_events; *skip_events; skip_events++) + if (!strcmp(event, *skip_events)) + return true; + + return false; +} + +static bool handle_end_event(struct perf_kvm_stat *kvm, + struct vcpu_event_record *vcpu_record, + struct event_key *key, + struct perf_sample *sample) +{ + struct kvm_event *event; + u64 time_begin, time_diff; + int vcpu; + + if (kvm->trace_vcpu == -1) + vcpu = -1; + else + vcpu = vcpu_record->vcpu_id; + + event = vcpu_record->last_event; + time_begin = vcpu_record->start_time; + + /* The begin event is not caught. */ + if (!time_begin) + return true; + + /* + * In some case, the 'begin event' only records the start timestamp, + * the actual event is recognized in the 'end event' (e.g. mmio-event). + */ + + /* Both begin and end events did not get the key. */ + if (!event && key->key == INVALID_KEY) + return true; + + if (!event) + event = find_create_kvm_event(kvm, key); + + if (!event) + return false; + + vcpu_record->last_event = NULL; + vcpu_record->start_time = 0; + + /* seems to happen once in a while during live mode */ + if (sample->time < time_begin) { + pr_debug("End time before begin time; skipping event.\n"); + return true; + } + + time_diff = sample->time - time_begin; + + if (kvm->duration && time_diff > kvm->duration) { + char decode[decode_str_len]; + + kvm->events_ops->decode_key(kvm, &event->key, decode); + if (!skip_event(decode)) { + pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n", + sample->time, sample->pid, vcpu_record->vcpu_id, + decode, time_diff / NSEC_PER_USEC); + } + } + + return update_kvm_event(event, vcpu, time_diff); +} + +static +struct vcpu_event_record *per_vcpu_record(struct thread *thread, + struct evsel *evsel, + struct perf_sample *sample) +{ + /* Only kvm_entry records vcpu id. */ + if (!thread__priv(thread) && kvm_entry_event(evsel)) { + struct vcpu_event_record *vcpu_record; + + vcpu_record = zalloc(sizeof(*vcpu_record)); + if (!vcpu_record) { + pr_err("%s: Not enough memory\n", __func__); + return NULL; + } + + vcpu_record->vcpu_id = evsel__intval(evsel, sample, vcpu_id_str); + thread__set_priv(thread, vcpu_record); + } + + return thread__priv(thread); +} + +static bool handle_kvm_event(struct perf_kvm_stat *kvm, + struct thread *thread, + struct evsel *evsel, + struct perf_sample *sample) +{ + struct vcpu_event_record *vcpu_record; + struct event_key key = { .key = INVALID_KEY, + .exit_reasons = kvm->exit_reasons }; + + vcpu_record = per_vcpu_record(thread, evsel, sample); + if (!vcpu_record) + return true; + + /* only process events for vcpus user cares about */ + if ((kvm->trace_vcpu != -1) && + (kvm->trace_vcpu != vcpu_record->vcpu_id)) + return true; + + if (kvm->events_ops->is_begin_event(evsel, sample, &key)) + return handle_begin_event(kvm, vcpu_record, &key, sample->time); + + if (is_child_event(kvm, evsel, sample, &key)) + return handle_child_event(kvm, vcpu_record, &key, sample); + + if (kvm->events_ops->is_end_event(evsel, sample, &key)) + return handle_end_event(kvm, vcpu_record, &key, sample); + + return true; +} + +#define GET_EVENT_KEY(func, field) \ +static u64 get_event_ ##func(struct kvm_event *event, int vcpu) \ +{ \ + if (vcpu == -1) \ + return event->total.field; \ + \ + if (vcpu >= event->max_vcpu) \ + return 0; \ + \ + return event->vcpu[vcpu].field; \ +} + +#define COMPARE_EVENT_KEY(func, field) \ +GET_EVENT_KEY(func, field) \ +static int compare_kvm_event_ ## func(struct kvm_event *one, \ + struct kvm_event *two, int vcpu)\ +{ \ + return get_event_ ##func(one, vcpu) > \ + get_event_ ##func(two, vcpu); \ +} + +GET_EVENT_KEY(time, time); +COMPARE_EVENT_KEY(count, stats.n); +COMPARE_EVENT_KEY(mean, stats.mean); +GET_EVENT_KEY(max, stats.max); +GET_EVENT_KEY(min, stats.min); + +#define DEF_SORT_NAME_KEY(name, compare_key) \ + { #name, compare_kvm_event_ ## compare_key } + +static struct kvm_event_key keys[] = { + DEF_SORT_NAME_KEY(sample, count), + DEF_SORT_NAME_KEY(time, mean), + { NULL, NULL } +}; + +static bool select_key(struct perf_kvm_stat *kvm) +{ + int i; + + for (i = 0; keys[i].name; i++) { + if (!strcmp(keys[i].name, kvm->sort_key)) { + kvm->compare = keys[i].key; + return true; + } + } + + pr_err("Unknown compare key:%s\n", kvm->sort_key); + return false; +} + +static void insert_to_result(struct rb_root *result, struct kvm_event *event, + key_cmp_fun bigger, int vcpu) +{ + struct rb_node **rb = &result->rb_node; + struct rb_node *parent = NULL; + struct kvm_event *p; + + while (*rb) { + p = container_of(*rb, struct kvm_event, rb); + parent = *rb; + + if (bigger(event, p, vcpu)) + rb = &(*rb)->rb_left; + else + rb = &(*rb)->rb_right; + } + + rb_link_node(&event->rb, parent, rb); + rb_insert_color(&event->rb, result); +} + +static void +update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event) +{ + int vcpu = kvm->trace_vcpu; + + kvm->total_count += get_event_count(event, vcpu); + kvm->total_time += get_event_time(event, vcpu); +} + +static bool event_is_valid(struct kvm_event *event, int vcpu) +{ + return !!get_event_count(event, vcpu); +} + +static void sort_result(struct perf_kvm_stat *kvm) +{ + unsigned int i; + int vcpu = kvm->trace_vcpu; + struct kvm_event *event; + + for (i = 0; i < EVENTS_CACHE_SIZE; i++) { + list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) { + if (event_is_valid(event, vcpu)) { + update_total_count(kvm, event); + insert_to_result(&kvm->result, event, + kvm->compare, vcpu); + } + } + } +} + +/* returns left most element of result, and erase it */ +static struct kvm_event *pop_from_result(struct rb_root *result) +{ + struct rb_node *node = rb_first(result); + + if (!node) + return NULL; + + rb_erase(node, result); + return container_of(node, struct kvm_event, rb); +} + +static void print_vcpu_info(struct perf_kvm_stat *kvm) +{ + int vcpu = kvm->trace_vcpu; + + pr_info("Analyze events for "); + + if (kvm->opts.target.system_wide) + pr_info("all VMs, "); + else if (kvm->opts.target.pid) + pr_info("pid(s) %s, ", kvm->opts.target.pid); + else + pr_info("dazed and confused on what is monitored, "); + + if (vcpu == -1) + pr_info("all VCPUs:\n\n"); + else + pr_info("VCPU %d:\n\n", vcpu); +} + +static void show_timeofday(void) +{ + char date[64]; + struct timeval tv; + struct tm ltime; + + gettimeofday(&tv, NULL); + if (localtime_r(&tv.tv_sec, <ime)) { + strftime(date, sizeof(date), "%H:%M:%S", <ime); + pr_info("%s.%06ld", date, tv.tv_usec); + } else + pr_info("00:00:00.000000"); + + return; +} + +static void print_result(struct perf_kvm_stat *kvm) +{ + char decode[decode_str_len]; + struct kvm_event *event; + int vcpu = kvm->trace_vcpu; + + if (kvm->live) { + puts(CONSOLE_CLEAR); + show_timeofday(); + } + + pr_info("\n\n"); + print_vcpu_info(kvm); + pr_info("%*s ", decode_str_len, kvm->events_ops->name); + pr_info("%10s ", "Samples"); + pr_info("%9s ", "Samples%"); + + pr_info("%9s ", "Time%"); + pr_info("%11s ", "Min Time"); + pr_info("%11s ", "Max Time"); + pr_info("%16s ", "Avg time"); + pr_info("\n\n"); + + while ((event = pop_from_result(&kvm->result))) { + u64 ecount, etime, max, min; + + ecount = get_event_count(event, vcpu); + etime = get_event_time(event, vcpu); + max = get_event_max(event, vcpu); + min = get_event_min(event, vcpu); + + kvm->events_ops->decode_key(kvm, &event->key, decode); + pr_info("%*s ", decode_str_len, decode); + pr_info("%10llu ", (unsigned long long)ecount); + pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100); + pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100); + pr_info("%9.2fus ", (double)min / NSEC_PER_USEC); + pr_info("%9.2fus ", (double)max / NSEC_PER_USEC); + pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC, + kvm_event_rel_stddev(vcpu, event)); + pr_info("\n"); + } + + pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n", + kvm->total_count, kvm->total_time / (double)NSEC_PER_USEC); + + if (kvm->lost_events) + pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events); +} + +#ifdef HAVE_TIMERFD_SUPPORT +static int process_lost_event(struct perf_tool *tool, + union perf_event *event __maybe_unused, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool); + + kvm->lost_events++; + return 0; +} +#endif + +static bool skip_sample(struct perf_kvm_stat *kvm, + struct perf_sample *sample) +{ + if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL) + return true; + + return false; +} + +static int process_sample_event(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct evsel *evsel, + struct machine *machine) +{ + int err = 0; + struct thread *thread; + struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, + tool); + + if (skip_sample(kvm, sample)) + return 0; + + thread = machine__findnew_thread(machine, sample->pid, sample->tid); + if (thread == NULL) { + pr_debug("problem processing %d event, skipping it.\n", + event->header.type); + return -1; + } + + if (!handle_kvm_event(kvm, thread, evsel, sample)) + err = -1; + + thread__put(thread); + return err; +} + +static int cpu_isa_config(struct perf_kvm_stat *kvm) +{ + char buf[128], *cpuid; + int err; + + if (kvm->live) { + err = get_cpuid(buf, sizeof(buf)); + if (err != 0) { + pr_err("Failed to look up CPU type: %s\n", + str_error_r(err, buf, sizeof(buf))); + return -err; + } + cpuid = buf; + } else + cpuid = kvm->session->header.env.cpuid; + + if (!cpuid) { + pr_err("Failed to look up CPU type\n"); + return -EINVAL; + } + + err = cpu_isa_init(kvm, cpuid); + if (err == -ENOTSUP) + pr_err("CPU %s is not supported.\n", cpuid); + + return err; +} + +static bool verify_vcpu(int vcpu) +{ + if (vcpu != -1 && vcpu < 0) { + pr_err("Invalid vcpu:%d.\n", vcpu); + return false; + } + + return true; +} + +#ifdef HAVE_TIMERFD_SUPPORT +/* keeping the max events to a modest level to keep + * the processing of samples per mmap smooth. + */ +#define PERF_KVM__MAX_EVENTS_PER_MMAP 25 + +static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx, + u64 *mmap_time) +{ + struct evlist *evlist = kvm->evlist; + union perf_event *event; + struct mmap *md; + u64 timestamp; + s64 n = 0; + int err; + + *mmap_time = ULLONG_MAX; + md = &evlist->mmap[idx]; + err = perf_mmap__read_init(&md->core); + if (err < 0) + return (err == -EAGAIN) ? 0 : -1; + + while ((event = perf_mmap__read_event(&md->core)) != NULL) { + err = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp); + if (err) { + perf_mmap__consume(&md->core); + pr_err("Failed to parse sample\n"); + return -1; + } + + err = perf_session__queue_event(kvm->session, event, timestamp, 0); + /* + * FIXME: Here we can't consume the event, as perf_session__queue_event will + * point to it, and it'll get possibly overwritten by the kernel. + */ + perf_mmap__consume(&md->core); + + if (err) { + pr_err("Failed to enqueue sample: %d\n", err); + return -1; + } + + /* save time stamp of our first sample for this mmap */ + if (n == 0) + *mmap_time = timestamp; + + /* limit events per mmap handled all at once */ + n++; + if (n == PERF_KVM__MAX_EVENTS_PER_MMAP) + break; + } + + perf_mmap__read_done(&md->core); + return n; +} + +static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm) +{ + int i, err, throttled = 0; + s64 n, ntotal = 0; + u64 flush_time = ULLONG_MAX, mmap_time; + + for (i = 0; i < kvm->evlist->core.nr_mmaps; i++) { + n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time); + if (n < 0) + return -1; + + /* flush time is going to be the minimum of all the individual + * mmap times. Essentially, we flush all the samples queued up + * from the last pass under our minimal start time -- that leaves + * a very small race for samples to come in with a lower timestamp. + * The ioctl to return the perf_clock timestamp should close the + * race entirely. + */ + if (mmap_time < flush_time) + flush_time = mmap_time; + + ntotal += n; + if (n == PERF_KVM__MAX_EVENTS_PER_MMAP) + throttled = 1; + } + + /* flush queue after each round in which we processed events */ + if (ntotal) { + struct ordered_events *oe = &kvm->session->ordered_events; + + oe->next_flush = flush_time; + err = ordered_events__flush(oe, OE_FLUSH__ROUND); + if (err) { + if (kvm->lost_events) + pr_info("\nLost events: %" PRIu64 "\n\n", + kvm->lost_events); + return err; + } + } + + return throttled; +} + +static volatile int done; + +static void sig_handler(int sig __maybe_unused) +{ + done = 1; +} + +static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm) +{ + struct itimerspec new_value; + int rc = -1; + + kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK); + if (kvm->timerfd < 0) { + pr_err("timerfd_create failed\n"); + goto out; + } + + new_value.it_value.tv_sec = kvm->display_time; + new_value.it_value.tv_nsec = 0; + new_value.it_interval.tv_sec = kvm->display_time; + new_value.it_interval.tv_nsec = 0; + + if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) { + pr_err("timerfd_settime failed: %d\n", errno); + close(kvm->timerfd); + goto out; + } + + rc = 0; +out: + return rc; +} + +static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm) +{ + uint64_t c; + int rc; + + rc = read(kvm->timerfd, &c, sizeof(uint64_t)); + if (rc < 0) { + if (errno == EAGAIN) + return 0; + + pr_err("Failed to read timer fd: %d\n", errno); + return -1; + } + + if (rc != sizeof(uint64_t)) { + pr_err("Error reading timer fd - invalid size returned\n"); + return -1; + } + + if (c != 1) + pr_debug("Missed timer beats: %" PRIu64 "\n", c-1); + + /* update display */ + sort_result(kvm); + print_result(kvm); + + /* reset counts */ + clear_events_cache_stats(kvm->kvm_events_cache); + kvm->total_count = 0; + kvm->total_time = 0; + kvm->lost_events = 0; + + return 0; +} + +static int fd_set_nonblock(int fd) +{ + long arg = 0; + + arg = fcntl(fd, F_GETFL); + if (arg < 0) { + pr_err("Failed to get current flags for fd %d\n", fd); + return -1; + } + + if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) { + pr_err("Failed to set non-block option on fd %d\n", fd); + return -1; + } + + return 0; +} + +static int perf_kvm__handle_stdin(void) +{ + int c; + + c = getc(stdin); + if (c == 'q') + return 1; + + return 0; +} + +static int kvm_events_live_report(struct perf_kvm_stat *kvm) +{ + int nr_stdin, ret, err = -EINVAL; + struct termios save; + + /* live flag must be set first */ + kvm->live = true; + + ret = cpu_isa_config(kvm); + if (ret < 0) + return ret; + + if (!verify_vcpu(kvm->trace_vcpu) || + !select_key(kvm) || + !register_kvm_events_ops(kvm)) { + goto out; + } + + set_term_quiet_input(&save); + init_kvm_event_record(kvm); + + signal(SIGINT, sig_handler); + signal(SIGTERM, sig_handler); + + /* add timer fd */ + if (perf_kvm__timerfd_create(kvm) < 0) { + err = -1; + goto out; + } + + if (evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0) + goto out; + + nr_stdin = evlist__add_pollfd(kvm->evlist, fileno(stdin)); + if (nr_stdin < 0) + goto out; + + if (fd_set_nonblock(fileno(stdin)) != 0) + goto out; + + /* everything is good - enable the events and process */ + evlist__enable(kvm->evlist); + + while (!done) { + struct fdarray *fda = &kvm->evlist->core.pollfd; + int rc; + + rc = perf_kvm__mmap_read(kvm); + if (rc < 0) + break; + + err = perf_kvm__handle_timerfd(kvm); + if (err) + goto out; + + if (fda->entries[nr_stdin].revents & POLLIN) + done = perf_kvm__handle_stdin(); + + if (!rc && !done) + err = evlist__poll(kvm->evlist, 100); + } + + evlist__disable(kvm->evlist); + + if (err == 0) { + sort_result(kvm); + print_result(kvm); + } + +out: + if (kvm->timerfd >= 0) + close(kvm->timerfd); + + tcsetattr(0, TCSAFLUSH, &save); + return err; +} + +static int kvm_live_open_events(struct perf_kvm_stat *kvm) +{ + int err, rc = -1; + struct evsel *pos; + struct evlist *evlist = kvm->evlist; + char sbuf[STRERR_BUFSIZE]; + + perf_evlist__config(evlist, &kvm->opts, NULL); + + /* + * Note: exclude_{guest,host} do not apply here. + * This command processes KVM tracepoints from host only + */ + evlist__for_each_entry(evlist, pos) { + struct perf_event_attr *attr = &pos->core.attr; + + /* make sure these *are* set */ + evsel__set_sample_bit(pos, TID); + evsel__set_sample_bit(pos, TIME); + evsel__set_sample_bit(pos, CPU); + evsel__set_sample_bit(pos, RAW); + /* make sure these are *not*; want as small a sample as possible */ + evsel__reset_sample_bit(pos, PERIOD); + evsel__reset_sample_bit(pos, IP); + evsel__reset_sample_bit(pos, CALLCHAIN); + evsel__reset_sample_bit(pos, ADDR); + evsel__reset_sample_bit(pos, READ); + attr->mmap = 0; + attr->comm = 0; + attr->task = 0; + + attr->sample_period = 1; + + attr->watermark = 0; + attr->wakeup_events = 1000; + + /* will enable all once we are ready */ + attr->disabled = 1; + } + + err = evlist__open(evlist); + if (err < 0) { + printf("Couldn't create the events: %s\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out; + } + + if (evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) { + ui__error("Failed to mmap the events: %s\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + evlist__close(evlist); + goto out; + } + + rc = 0; + +out: + return rc; +} +#endif + +static int read_events(struct perf_kvm_stat *kvm) +{ + int ret; + + struct perf_tool eops = { + .sample = process_sample_event, + .comm = perf_event__process_comm, + .namespaces = perf_event__process_namespaces, + .ordered_events = true, + }; + struct perf_data file = { + .path = kvm->file_name, + .mode = PERF_DATA_MODE_READ, + .force = kvm->force, + }; + + kvm->tool = eops; + kvm->session = perf_session__new(&file, false, &kvm->tool); + if (IS_ERR(kvm->session)) { + pr_err("Initializing perf session failed\n"); + return PTR_ERR(kvm->session); + } + + symbol__init(&kvm->session->header.env); + + if (!perf_session__has_traces(kvm->session, "kvm record")) { + ret = -EINVAL; + goto out_delete; + } + + /* + * Do not use 'isa' recorded in kvm_exit tracepoint since it is not + * traced in the old kernel. + */ + ret = cpu_isa_config(kvm); + if (ret < 0) + goto out_delete; + + ret = perf_session__process_events(kvm->session); + +out_delete: + perf_session__delete(kvm->session); + return ret; +} + +static int parse_target_str(struct perf_kvm_stat *kvm) +{ + if (kvm->opts.target.pid) { + kvm->pid_list = intlist__new(kvm->opts.target.pid); + if (kvm->pid_list == NULL) { + pr_err("Error parsing process id string\n"); + return -EINVAL; + } + } + + return 0; +} + +static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm) +{ + int ret = -EINVAL; + int vcpu = kvm->trace_vcpu; + + if (parse_target_str(kvm) != 0) + goto exit; + + if (!verify_vcpu(vcpu)) + goto exit; + + if (!select_key(kvm)) + goto exit; + + if (!register_kvm_events_ops(kvm)) + goto exit; + + init_kvm_event_record(kvm); + setup_pager(); + + ret = read_events(kvm); + if (ret) + goto exit; + + sort_result(kvm); + print_result(kvm); + +exit: + return ret; +} + +#define STRDUP_FAIL_EXIT(s) \ + ({ char *_p; \ + _p = strdup(s); \ + if (!_p) \ + return -ENOMEM; \ + _p; \ + }) + +int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused) +{ + return 0; +} + +static int +kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv) +{ + unsigned int rec_argc, i, j, events_tp_size; + const char **rec_argv; + const char * const record_args[] = { + "record", + "-R", + "-m", "1024", + "-c", "1", + }; + const char * const kvm_stat_record_usage[] = { + "perf kvm stat record [<options>]", + NULL + }; + const char * const *events_tp; + int ret; + + events_tp_size = 0; + ret = setup_kvm_events_tp(kvm); + if (ret < 0) { + pr_err("Unable to setup the kvm tracepoints\n"); + return ret; + } + + for (events_tp = kvm_events_tp; *events_tp; events_tp++) + events_tp_size++; + + rec_argc = ARRAY_SIZE(record_args) + argc + 2 + + 2 * events_tp_size; + rec_argv = calloc(rec_argc + 1, sizeof(char *)); + + if (rec_argv == NULL) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(record_args); i++) + rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]); + + for (j = 0; j < events_tp_size; j++) { + rec_argv[i++] = "-e"; + rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]); + } + + rec_argv[i++] = STRDUP_FAIL_EXIT("-o"); + rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name); + + for (j = 1; j < (unsigned int)argc; j++, i++) + rec_argv[i] = argv[j]; + + set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN); + set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN); + set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN); + + set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED); + set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED); + set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED); + set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED); + set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED); + + record_usage = kvm_stat_record_usage; + return cmd_record(i, rec_argv); +} + +static int +kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv) +{ + const struct option kvm_events_report_options[] = { + OPT_STRING(0, "event", &kvm->report_event, "report event", + "event for reporting: vmexit, " + "mmio (x86 only), ioport (x86 only)"), + OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu, + "vcpu id to report"), + OPT_STRING('k', "key", &kvm->sort_key, "sort-key", + "key for sorting: sample(sort by samples number)" + " time (sort by avg time)"), + OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid", + "analyze events only for given process id(s)"), + OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"), + OPT_END() + }; + + const char * const kvm_events_report_usage[] = { + "perf kvm stat report [<options>]", + NULL + }; + + if (argc) { + argc = parse_options(argc, argv, + kvm_events_report_options, + kvm_events_report_usage, 0); + if (argc) + usage_with_options(kvm_events_report_usage, + kvm_events_report_options); + } + + if (!kvm->opts.target.pid) + kvm->opts.target.system_wide = true; + + return kvm_events_report_vcpu(kvm); +} + +#ifdef HAVE_TIMERFD_SUPPORT +static struct evlist *kvm_live_event_list(void) +{ + struct evlist *evlist; + char *tp, *name, *sys; + int err = -1; + const char * const *events_tp; + + evlist = evlist__new(); + if (evlist == NULL) + return NULL; + + for (events_tp = kvm_events_tp; *events_tp; events_tp++) { + + tp = strdup(*events_tp); + if (tp == NULL) + goto out; + + /* split tracepoint into subsystem and name */ + sys = tp; + name = strchr(tp, ':'); + if (name == NULL) { + pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n", + *events_tp); + free(tp); + goto out; + } + *name = '\0'; + name++; + + if (evlist__add_newtp(evlist, sys, name, NULL)) { + pr_err("Failed to add %s tracepoint to the list\n", *events_tp); + free(tp); + goto out; + } + + free(tp); + } + + err = 0; + +out: + if (err) { + evlist__delete(evlist); + evlist = NULL; + } + + return evlist; +} + +static int kvm_events_live(struct perf_kvm_stat *kvm, + int argc, const char **argv) +{ + char errbuf[BUFSIZ]; + int err; + + const struct option live_options[] = { + OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid", + "record events on existing process id"), + OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages", + "number of mmap data pages", + perf_evlist__parse_mmap_pages), + OPT_INCR('v', "verbose", &verbose, + "be more verbose (show counter open errors, etc)"), + OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide, + "system-wide collection from all CPUs"), + OPT_UINTEGER('d', "display", &kvm->display_time, + "time in seconds between display updates"), + OPT_STRING(0, "event", &kvm->report_event, "report event", + "event for reporting: " + "vmexit, mmio (x86 only), ioport (x86 only)"), + OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu, + "vcpu id to report"), + OPT_STRING('k', "key", &kvm->sort_key, "sort-key", + "key for sorting: sample(sort by samples number)" + " time (sort by avg time)"), + OPT_U64(0, "duration", &kvm->duration, + "show events other than" + " HLT (x86 only) or Wait state (s390 only)" + " that take longer than duration usecs"), + OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout, + "per thread proc mmap processing timeout in ms"), + OPT_END() + }; + const char * const live_usage[] = { + "perf kvm stat live [<options>]", + NULL + }; + struct perf_data data = { + .mode = PERF_DATA_MODE_WRITE, + }; + + + /* event handling */ + kvm->tool.sample = process_sample_event; + kvm->tool.comm = perf_event__process_comm; + kvm->tool.exit = perf_event__process_exit; + kvm->tool.fork = perf_event__process_fork; + kvm->tool.lost = process_lost_event; + kvm->tool.namespaces = perf_event__process_namespaces; + kvm->tool.ordered_events = true; + perf_tool__fill_defaults(&kvm->tool); + + /* set defaults */ + kvm->display_time = 1; + kvm->opts.user_interval = 1; + kvm->opts.mmap_pages = 512; + kvm->opts.target.uses_mmap = false; + kvm->opts.target.uid_str = NULL; + kvm->opts.target.uid = UINT_MAX; + + symbol__init(NULL); + disable_buildid_cache(); + + use_browser = 0; + + if (argc) { + argc = parse_options(argc, argv, live_options, + live_usage, 0); + if (argc) + usage_with_options(live_usage, live_options); + } + + kvm->duration *= NSEC_PER_USEC; /* convert usec to nsec */ + + /* + * target related setups + */ + err = target__validate(&kvm->opts.target); + if (err) { + target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ); + ui__warning("%s", errbuf); + } + + if (target__none(&kvm->opts.target)) + kvm->opts.target.system_wide = true; + + + /* + * generate the event list + */ + err = setup_kvm_events_tp(kvm); + if (err < 0) { + pr_err("Unable to setup the kvm tracepoints\n"); + return err; + } + + kvm->evlist = kvm_live_event_list(); + if (kvm->evlist == NULL) { + err = -1; + goto out; + } + + if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0) + usage_with_options(live_usage, live_options); + + /* + * perf session + */ + kvm->session = perf_session__new(&data, false, &kvm->tool); + if (IS_ERR(kvm->session)) { + err = PTR_ERR(kvm->session); + goto out; + } + kvm->session->evlist = kvm->evlist; + perf_session__set_id_hdr_size(kvm->session); + ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true); + machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target, + kvm->evlist->core.threads, false, 1); + err = kvm_live_open_events(kvm); + if (err) + goto out; + + err = kvm_events_live_report(kvm); + +out: + perf_session__delete(kvm->session); + kvm->session = NULL; + evlist__delete(kvm->evlist); + + return err; +} +#endif + +static void print_kvm_stat_usage(void) +{ + printf("Usage: perf kvm stat <command>\n\n"); + + printf("# Available commands:\n"); + printf("\trecord: record kvm events\n"); + printf("\treport: report statistical data of kvm events\n"); + printf("\tlive: live reporting of statistical data of kvm events\n"); + + printf("\nOtherwise, it is the alias of 'perf stat':\n"); +} + +static int kvm_cmd_stat(const char *file_name, int argc, const char **argv) +{ + struct perf_kvm_stat kvm = { + .file_name = file_name, + + .trace_vcpu = -1, + .report_event = "vmexit", + .sort_key = "sample", + + }; + + if (argc == 1) { + print_kvm_stat_usage(); + goto perf_stat; + } + + if (!strncmp(argv[1], "rec", 3)) + return kvm_events_record(&kvm, argc - 1, argv + 1); + + if (!strncmp(argv[1], "rep", 3)) + return kvm_events_report(&kvm, argc - 1 , argv + 1); + +#ifdef HAVE_TIMERFD_SUPPORT + if (!strncmp(argv[1], "live", 4)) + return kvm_events_live(&kvm, argc - 1 , argv + 1); +#endif + +perf_stat: + return cmd_stat(argc, argv); +} +#endif /* HAVE_KVM_STAT_SUPPORT */ + +int __weak kvm_add_default_arch_event(int *argc __maybe_unused, + const char **argv __maybe_unused) +{ + return 0; +} + +static int __cmd_record(const char *file_name, int argc, const char **argv) +{ + int rec_argc, i = 0, j, ret; + const char **rec_argv; + + ret = kvm_add_default_arch_event(&argc, argv); + if (ret) + return -EINVAL; + + rec_argc = argc + 2; + rec_argv = calloc(rec_argc + 1, sizeof(char *)); + rec_argv[i++] = strdup("record"); + rec_argv[i++] = strdup("-o"); + rec_argv[i++] = strdup(file_name); + for (j = 1; j < argc; j++, i++) + rec_argv[i] = argv[j]; + + BUG_ON(i != rec_argc); + + return cmd_record(i, rec_argv); +} + +static int __cmd_report(const char *file_name, int argc, const char **argv) +{ + int rec_argc, i = 0, j; + const char **rec_argv; + + rec_argc = argc + 2; + rec_argv = calloc(rec_argc + 1, sizeof(char *)); + rec_argv[i++] = strdup("report"); + rec_argv[i++] = strdup("-i"); + rec_argv[i++] = strdup(file_name); + for (j = 1; j < argc; j++, i++) + rec_argv[i] = argv[j]; + + BUG_ON(i != rec_argc); + + return cmd_report(i, rec_argv); +} + +static int +__cmd_buildid_list(const char *file_name, int argc, const char **argv) +{ + int rec_argc, i = 0, j; + const char **rec_argv; + + rec_argc = argc + 2; + rec_argv = calloc(rec_argc + 1, sizeof(char *)); + rec_argv[i++] = strdup("buildid-list"); + rec_argv[i++] = strdup("-i"); + rec_argv[i++] = strdup(file_name); + for (j = 1; j < argc; j++, i++) + rec_argv[i] = argv[j]; + + BUG_ON(i != rec_argc); + + return cmd_buildid_list(i, rec_argv); +} + +int cmd_kvm(int argc, const char **argv) +{ + const char *file_name = NULL; + const struct option kvm_options[] = { + OPT_STRING('i', "input", &file_name, "file", + "Input file name"), + OPT_STRING('o', "output", &file_name, "file", + "Output file name"), + OPT_BOOLEAN(0, "guest", &perf_guest, + "Collect guest os data"), + OPT_BOOLEAN(0, "host", &perf_host, + "Collect host os data"), + OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory", + "guest mount directory under which every guest os" + " instance has a subdir"), + OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name, + "file", "file saving guest os vmlinux"), + OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms, + "file", "file saving guest os /proc/kallsyms"), + OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules, + "file", "file saving guest os /proc/modules"), + OPT_INCR('v', "verbose", &verbose, + "be more verbose (show counter open errors, etc)"), + OPT_END() + }; + + const char *const kvm_subcommands[] = { "top", "record", "report", "diff", + "buildid-list", "stat", NULL }; + const char *kvm_usage[] = { NULL, NULL }; + + perf_host = 0; + perf_guest = 1; + + argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage, + PARSE_OPT_STOP_AT_NON_OPTION); + if (!argc) + usage_with_options(kvm_usage, kvm_options); + + if (!perf_host) + perf_guest = 1; + + if (!file_name) { + file_name = get_filename_for_perf_kvm(); + + if (!file_name) { + pr_err("Failed to allocate memory for filename\n"); + return -ENOMEM; + } + } + + if (!strncmp(argv[0], "rec", 3)) + return __cmd_record(file_name, argc, argv); + else if (!strncmp(argv[0], "rep", 3)) + return __cmd_report(file_name, argc, argv); + else if (!strncmp(argv[0], "diff", 4)) + return cmd_diff(argc, argv); + else if (!strncmp(argv[0], "top", 3)) + return cmd_top(argc, argv); + else if (!strncmp(argv[0], "buildid-list", 12)) + return __cmd_buildid_list(file_name, argc, argv); +#ifdef HAVE_KVM_STAT_SUPPORT + else if (!strncmp(argv[0], "stat", 4)) + return kvm_cmd_stat(file_name, argc, argv); +#endif + else + usage_with_options(kvm_usage, kvm_options); + + return 0; +} |