// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Refactored from builtin-top.c, see that files for further copyright notes.
 */

#include "event.h"
#include "evlist.h"
#include "evsel.h"
#include "parse-events.h"
#include "symbol.h"
#include "top.h"
#include "util.h"
#include <inttypes.h>

#define SNPRINTF(buf, size, fmt, args...) \
({ \
        size_t r = snprintf(buf, size, fmt, ## args); \
        r > size ?  size : r; \
})

size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
{
        float samples_per_sec;
        float ksamples_per_sec;
        float esamples_percent;
        struct record_opts *opts = &top->record_opts;
        struct target *target = &opts->target;
        size_t ret = 0;
        int nr_cpus;

        if (top->samples) {
                samples_per_sec = top->samples / top->delay_secs;
                ksamples_per_sec = top->kernel_samples / top->delay_secs;
                esamples_percent = (100.0 * top->exact_samples) / top->samples;
        } else {
                samples_per_sec = ksamples_per_sec = esamples_percent = 0.0;
        }

        if (!perf_guest) {
                float ksamples_percent = 0.0;

                if (samples_per_sec)
                        ksamples_percent = (100.0 * ksamples_per_sec) /
                                                        samples_per_sec;
                ret = SNPRINTF(bf, size,
                               "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%"
                               "  exact: %4.1f%% lost: %" PRIu64 "/%" PRIu64 " drop: %" PRIu64 "/%" PRIu64 " [",
                               samples_per_sec, ksamples_percent, esamples_percent,
                               top->lost, top->lost_total, top->drop, top->drop_total);
        } else {
                float us_samples_per_sec = top->us_samples / top->delay_secs;
                float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
                float guest_us_samples_per_sec = top->guest_us_samples / top->delay_secs;

                ret = SNPRINTF(bf, size,
                               "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% us:%4.1f%%"
                               " guest kernel:%4.1f%% guest us:%4.1f%%"
                               " exact: %4.1f%% [", samples_per_sec,
                               100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
                                                 samples_per_sec)),
                               100.0 - (100.0 * ((samples_per_sec - us_samples_per_sec) /
                                                 samples_per_sec)),
                               100.0 - (100.0 * ((samples_per_sec -
                                                  guest_kernel_samples_per_sec) /
                                                 samples_per_sec)),
                               100.0 - (100.0 * ((samples_per_sec -
                                                  guest_us_samples_per_sec) /
                                                 samples_per_sec)),
                               esamples_percent);
        }

        if (top->evlist->core.nr_entries == 1) {
                struct evsel *first = evlist__first(top->evlist);
                ret += SNPRINTF(bf + ret, size - ret, "%" PRIu64 "%s ",
                                (uint64_t)first->core.attr.sample_period,
                                opts->freq ? "Hz" : "");
        }

        ret += SNPRINTF(bf + ret, size - ret, "%s", evsel__name(top->sym_evsel));

        ret += SNPRINTF(bf + ret, size - ret, "], ");

        if (target->pid)
                ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %s",
                                target->pid);
        else if (target->tid)
                ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %s",
                                target->tid);
        else if (top->uid_str != NULL)
                ret += SNPRINTF(bf + ret, size - ret, " (uid: %s",
                                top->uid_str);
        else
                ret += SNPRINTF(bf + ret, size - ret, " (all");

        nr_cpus = perf_cpu_map__nr(top->evlist->core.user_requested_cpus);
        if (target->cpu_list)
                ret += SNPRINTF(bf + ret, size - ret, ", CPU%s: %s)",
                                nr_cpus > 1 ? "s" : "",
                                target->cpu_list);
        else {
                if (target->tid)
                        ret += SNPRINTF(bf + ret, size - ret, ")");
                else
                        ret += SNPRINTF(bf + ret, size - ret, ", %d CPU%s)",
                                        nr_cpus, nr_cpus > 1 ? "s" : "");
        }

        perf_top__reset_sample_counters(top);
        return ret;
}

void perf_top__reset_sample_counters(struct perf_top *top)
{
        top->samples = top->us_samples = top->kernel_samples =
        top->exact_samples = top->guest_kernel_samples =
        top->guest_us_samples = top->lost = top->drop = 0;
}