// SPDX-License-Identifier: GPL-2.0
/*
 * Arm Statistical Profiling Extensions (SPE) support
 * Copyright (c) 2017-2018, Arm Ltd.
 */

#include <byteswap.h>
#include <endian.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/types.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <unistd.h>

#include "auxtrace.h"
#include "color.h"
#include "debug.h"
#include "evlist.h"
#include "evsel.h"
#include "machine.h"
#include "session.h"
#include "symbol.h"
#include "thread.h"
#include "thread-stack.h"
#include "tsc.h"
#include "tool.h"
#include "util/synthetic-events.h"

#include "arm-spe.h"
#include "arm-spe-decoder/arm-spe-decoder.h"
#include "arm-spe-decoder/arm-spe-pkt-decoder.h"

#define MAX_TIMESTAMP (~0ULL)

struct arm_spe {
        struct auxtrace                 auxtrace;
        struct auxtrace_queues          queues;
        struct auxtrace_heap            heap;
        struct itrace_synth_opts        synth_opts;
        u32                             auxtrace_type;
        struct perf_session             *session;
        struct machine                  *machine;
        u32                             pmu_type;

        struct perf_tsc_conversion      tc;

        u8                              timeless_decoding;
        u8                              data_queued;

        u8                              sample_flc;
        u8                              sample_llc;
        u8                              sample_tlb;
        u8                              sample_branch;
        u8                              sample_remote_access;
        u8                              sample_memory;

        u64                             l1d_miss_id;
        u64                             l1d_access_id;
        u64                             llc_miss_id;
        u64                             llc_access_id;
        u64                             tlb_miss_id;
        u64                             tlb_access_id;
        u64                             branch_miss_id;
        u64                             remote_access_id;
        u64                             memory_id;

        u64                             kernel_start;

        unsigned long                   num_events;
};

struct arm_spe_queue {
        struct arm_spe                  *spe;
        unsigned int                    queue_nr;
        struct auxtrace_buffer          *buffer;
        struct auxtrace_buffer          *old_buffer;
        union perf_event                *event_buf;
        bool                            on_heap;
        bool                            done;
        pid_t                           pid;
        pid_t                           tid;
        int                             cpu;
        struct arm_spe_decoder          *decoder;
        u64                             time;
        u64                             timestamp;
        struct thread                   *thread;
};

static void arm_spe_dump(struct arm_spe *spe __maybe_unused,
                         unsigned char *buf, size_t len)
{
        struct arm_spe_pkt packet;
        size_t pos = 0;
        int ret, pkt_len, i;
        char desc[ARM_SPE_PKT_DESC_MAX];
        const char *color = PERF_COLOR_BLUE;

        color_fprintf(stdout, color,
                      ". ... ARM SPE data: size %zu bytes\n",
                      len);

        while (len) {
                ret = arm_spe_get_packet(buf, len, &packet);
                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 = arm_spe_pkt_desc(&packet, desc,
                                               ARM_SPE_PKT_DESC_MAX);
                        if (!ret)
                                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 arm_spe_dump_event(struct arm_spe *spe, unsigned char *buf,
                               size_t len)
{
        printf(".\n");
        arm_spe_dump(spe, buf, len);
}

static int arm_spe_get_trace(struct arm_spe_buffer *b, void *data)
{
        struct arm_spe_queue *speq = data;
        struct auxtrace_buffer *buffer = speq->buffer;
        struct auxtrace_buffer *old_buffer = speq->old_buffer;
        struct auxtrace_queue *queue;

        queue = &speq->spe->queues.queue_array[speq->queue_nr];

        buffer = auxtrace_buffer__next(queue, buffer);
        /* If no more data, drop the previous auxtrace_buffer and return */
        if (!buffer) {
                if (old_buffer)
                        auxtrace_buffer__drop_data(old_buffer);
                b->len = 0;
                return 0;
        }

        speq->buffer = buffer;

        /* If the aux_buffer doesn't have data associated, try to load it */
        if (!buffer->data) {
                /* get the file desc associated with the perf data file */
                int fd = perf_data__fd(speq->spe->session->data);

                buffer->data = auxtrace_buffer__get_data(buffer, fd);
                if (!buffer->data)
                        return -ENOMEM;
        }

        b->len = buffer->size;
        b->buf = buffer->data;

        if (b->len) {
                if (old_buffer)
                        auxtrace_buffer__drop_data(old_buffer);
                speq->old_buffer = buffer;
        } else {
                auxtrace_buffer__drop_data(buffer);
                return arm_spe_get_trace(b, data);
        }

        return 0;
}

static struct arm_spe_queue *arm_spe__alloc_queue(struct arm_spe *spe,
                unsigned int queue_nr)
{
        struct arm_spe_params params = { .get_trace = 0, };
        struct arm_spe_queue *speq;

        speq = zalloc(sizeof(*speq));
        if (!speq)
                return NULL;

        speq->event_buf = malloc(PERF_SAMPLE_MAX_SIZE);
        if (!speq->event_buf)
                goto out_free;

        speq->spe = spe;
        speq->queue_nr = queue_nr;
        speq->pid = -1;
        speq->tid = -1;
        speq->cpu = -1;

        /* params set */
        params.get_trace = arm_spe_get_trace;
        params.data = speq;

        /* create new decoder */
        speq->decoder = arm_spe_decoder_new(&params);
        if (!speq->decoder)
                goto out_free;

        return speq;

out_free:
        zfree(&speq->event_buf);
        free(speq);

        return NULL;
}

static inline u8 arm_spe_cpumode(struct arm_spe *spe, u64 ip)
{
        return ip >= spe->kernel_start ?
                PERF_RECORD_MISC_KERNEL :
                PERF_RECORD_MISC_USER;
}

static void arm_spe_prep_sample(struct arm_spe *spe,
                                struct arm_spe_queue *speq,
                                union perf_event *event,
                                struct perf_sample *sample)
{
        struct arm_spe_record *record = &speq->decoder->record;

        if (!spe->timeless_decoding)
                sample->time = tsc_to_perf_time(record->timestamp, &spe->tc);

        sample->ip = record->from_ip;
        sample->cpumode = arm_spe_cpumode(spe, sample->ip);
        sample->pid = speq->pid;
        sample->tid = speq->tid;
        sample->period = 1;
        sample->cpu = speq->cpu;

        event->sample.header.type = PERF_RECORD_SAMPLE;
        event->sample.header.misc = sample->cpumode;
        event->sample.header.size = sizeof(struct perf_event_header);
}

static inline int
arm_spe_deliver_synth_event(struct arm_spe *spe,
                            struct arm_spe_queue *speq __maybe_unused,
                            union perf_event *event,
                            struct perf_sample *sample)
{
        int ret;

        ret = perf_session__deliver_synth_event(spe->session, event, sample);
        if (ret)
                pr_err("ARM SPE: failed to deliver event, error %d\n", ret);

        return ret;
}

static int arm_spe__synth_mem_sample(struct arm_spe_queue *speq,
                                     u64 spe_events_id, u64 data_src)
{
        struct arm_spe *spe = speq->spe;
        struct arm_spe_record *record = &speq->decoder->record;
        union perf_event *event = speq->event_buf;
        struct perf_sample sample = { .ip = 0, };

        arm_spe_prep_sample(spe, speq, event, &sample);

        sample.id = spe_events_id;
        sample.stream_id = spe_events_id;
        sample.addr = record->virt_addr;
        sample.phys_addr = record->phys_addr;
        sample.data_src = data_src;

        return arm_spe_deliver_synth_event(spe, speq, event, &sample);
}

static int arm_spe__synth_branch_sample(struct arm_spe_queue *speq,
                                        u64 spe_events_id)
{
        struct arm_spe *spe = speq->spe;
        struct arm_spe_record *record = &speq->decoder->record;
        union perf_event *event = speq->event_buf;
        struct perf_sample sample = { .ip = 0, };

        arm_spe_prep_sample(spe, speq, event, &sample);

        sample.id = spe_events_id;
        sample.stream_id = spe_events_id;
        sample.addr = record->to_ip;

        return arm_spe_deliver_synth_event(spe, speq, event, &sample);
}

#define SPE_MEM_TYPE    (ARM_SPE_L1D_ACCESS | ARM_SPE_L1D_MISS | \
                         ARM_SPE_LLC_ACCESS | ARM_SPE_LLC_MISS | \
                         ARM_SPE_REMOTE_ACCESS)

static bool arm_spe__is_memory_event(enum arm_spe_sample_type type)
{
        if (type & SPE_MEM_TYPE)
                return true;

        return false;
}

static u64 arm_spe__synth_data_source(const struct arm_spe_record *record)
{
        union perf_mem_data_src data_src = { 0 };

        if (record->op == ARM_SPE_LD)
                data_src.mem_op = PERF_MEM_OP_LOAD;
        else
                data_src.mem_op = PERF_MEM_OP_STORE;

        if (record->type & (ARM_SPE_LLC_ACCESS | ARM_SPE_LLC_MISS)) {
                data_src.mem_lvl = PERF_MEM_LVL_L3;

                if (record->type & ARM_SPE_LLC_MISS)
                        data_src.mem_lvl |= PERF_MEM_LVL_MISS;
                else
                        data_src.mem_lvl |= PERF_MEM_LVL_HIT;
        } else if (record->type & (ARM_SPE_L1D_ACCESS | ARM_SPE_L1D_MISS)) {
                data_src.mem_lvl = PERF_MEM_LVL_L1;

                if (record->type & ARM_SPE_L1D_MISS)
                        data_src.mem_lvl |= PERF_MEM_LVL_MISS;
                else
                        data_src.mem_lvl |= PERF_MEM_LVL_HIT;
        }

        if (record->type & ARM_SPE_REMOTE_ACCESS)
                data_src.mem_lvl |= PERF_MEM_LVL_REM_CCE1;

        if (record->type & (ARM_SPE_TLB_ACCESS | ARM_SPE_TLB_MISS)) {
                data_src.mem_dtlb = PERF_MEM_TLB_WK;

                if (record->type & ARM_SPE_TLB_MISS)
                        data_src.mem_dtlb |= PERF_MEM_TLB_MISS;
                else
                        data_src.mem_dtlb |= PERF_MEM_TLB_HIT;
        }

        return data_src.val;
}

static int arm_spe_sample(struct arm_spe_queue *speq)
{
        const struct arm_spe_record *record = &speq->decoder->record;
        struct arm_spe *spe = speq->spe;
        u64 data_src;
        int err;

        data_src = arm_spe__synth_data_source(record);

        if (spe->sample_flc) {
                if (record->type & ARM_SPE_L1D_MISS) {
                        err = arm_spe__synth_mem_sample(speq, spe->l1d_miss_id,
                                                        data_src);
                        if (err)
                                return err;
                }

                if (record->type & ARM_SPE_L1D_ACCESS) {
                        err = arm_spe__synth_mem_sample(speq, spe->l1d_access_id,
                                                        data_src);
                        if (err)
                                return err;
                }
        }

        if (spe->sample_llc) {
                if (record->type & ARM_SPE_LLC_MISS) {
                        err = arm_spe__synth_mem_sample(speq, spe->llc_miss_id,
                                                        data_src);
                        if (err)
                                return err;
                }

                if (record->type & ARM_SPE_LLC_ACCESS) {
                        err = arm_spe__synth_mem_sample(speq, spe->llc_access_id,
                                                        data_src);
                        if (err)
                                return err;
                }
        }

        if (spe->sample_tlb) {
                if (record->type & ARM_SPE_TLB_MISS) {
                        err = arm_spe__synth_mem_sample(speq, spe->tlb_miss_id,
                                                        data_src);
                        if (err)
                                return err;
                }

                if (record->type & ARM_SPE_TLB_ACCESS) {
                        err = arm_spe__synth_mem_sample(speq, spe->tlb_access_id,
                                                        data_src);
                        if (err)
                                return err;
                }
        }

        if (spe->sample_branch && (record->type & ARM_SPE_BRANCH_MISS)) {
                err = arm_spe__synth_branch_sample(speq, spe->branch_miss_id);
                if (err)
                        return err;
        }

        if (spe->sample_remote_access &&
            (record->type & ARM_SPE_REMOTE_ACCESS)) {
                err = arm_spe__synth_mem_sample(speq, spe->remote_access_id,
                                                data_src);
                if (err)
                        return err;
        }

        if (spe->sample_memory && arm_spe__is_memory_event(record->type)) {
                err = arm_spe__synth_mem_sample(speq, spe->memory_id, data_src);
                if (err)
                        return err;
        }

        return 0;
}

static int arm_spe_run_decoder(struct arm_spe_queue *speq, u64 *timestamp)
{
        struct arm_spe *spe = speq->spe;
        struct arm_spe_record *record;
        int ret;

        if (!spe->kernel_start)
                spe->kernel_start = machine__kernel_start(spe->machine);

        while (1) {
                /*
                 * The usual logic is firstly to decode the packets, and then
                 * based the record to synthesize sample; but here the flow is
                 * reversed: it calls arm_spe_sample() for synthesizing samples
                 * prior to arm_spe_decode().
                 *
                 * Two reasons for this code logic:
                 * 1. Firstly, when setup queue in arm_spe__setup_queue(), it
                 * has decoded trace data and generated a record, but the record
                 * is left to generate sample until run to here, so it's correct
                 * to synthesize sample for the left record.
                 * 2. After decoding trace data, it needs to compare the record
                 * timestamp with the coming perf event, if the record timestamp
                 * is later than the perf event, it needs bail out and pushs the
                 * record into auxtrace heap, thus the record can be deferred to
                 * synthesize sample until run to here at the next time; so this
                 * can correlate samples between Arm SPE trace data and other
                 * perf events with correct time ordering.
                 */
                ret = arm_spe_sample(speq);
                if (ret)
                        return ret;

                ret = arm_spe_decode(speq->decoder);
                if (!ret) {
                        pr_debug("No data or all data has been processed.\n");
                        return 1;
                }

                /*
                 * Error is detected when decode SPE trace data, continue to
                 * the next trace data and find out more records.
                 */
                if (ret < 0)
                        continue;

                record = &speq->decoder->record;

                /* Update timestamp for the last record */
                if (record->timestamp > speq->timestamp)
                        speq->timestamp = record->timestamp;

                /*
                 * If the timestamp of the queue is later than timestamp of the
                 * coming perf event, bail out so can allow the perf event to
                 * be processed ahead.
                 */
                if (!spe->timeless_decoding && speq->timestamp >= *timestamp) {
                        *timestamp = speq->timestamp;
                        return 0;
                }
        }

        return 0;
}

static int arm_spe__setup_queue(struct arm_spe *spe,
                               struct auxtrace_queue *queue,
                               unsigned int queue_nr)
{
        struct arm_spe_queue *speq = queue->priv;
        struct arm_spe_record *record;

        if (list_empty(&queue->head) || speq)
                return 0;

        speq = arm_spe__alloc_queue(spe, queue_nr);

        if (!speq)
                return -ENOMEM;

        queue->priv = speq;

        if (queue->cpu != -1)
                speq->cpu = queue->cpu;

        if (!speq->on_heap) {
                int ret;

                if (spe->timeless_decoding)
                        return 0;

retry:
                ret = arm_spe_decode(speq->decoder);

                if (!ret)
                        return 0;

                if (ret < 0)
                        goto retry;

                record = &speq->decoder->record;

                speq->timestamp = record->timestamp;
                ret = auxtrace_heap__add(&spe->heap, queue_nr, speq->timestamp);
                if (ret)
                        return ret;
                speq->on_heap = true;
        }

        return 0;
}

static int arm_spe__setup_queues(struct arm_spe *spe)
{
        unsigned int i;
        int ret;

        for (i = 0; i < spe->queues.nr_queues; i++) {
                ret = arm_spe__setup_queue(spe, &spe->queues.queue_array[i], i);
                if (ret)
                        return ret;
        }

        return 0;
}

static int arm_spe__update_queues(struct arm_spe *spe)
{
        if (spe->queues.new_data) {
                spe->queues.new_data = false;
                return arm_spe__setup_queues(spe);
        }

        return 0;
}

static bool arm_spe__is_timeless_decoding(struct arm_spe *spe)
{
        struct evsel *evsel;
        struct evlist *evlist = spe->session->evlist;
        bool timeless_decoding = true;

        /*
         * Circle through the list of event and complain if we find one
         * with the time bit set.
         */
        evlist__for_each_entry(evlist, evsel) {
                if ((evsel->core.attr.sample_type & PERF_SAMPLE_TIME))
                        timeless_decoding = false;
        }

        return timeless_decoding;
}

static void arm_spe_set_pid_tid_cpu(struct arm_spe *spe,
                                    struct auxtrace_queue *queue)
{
        struct arm_spe_queue *speq = queue->priv;
        pid_t tid;

        tid = machine__get_current_tid(spe->machine, speq->cpu);
        if (tid != -1) {
                speq->tid = tid;
                thread__zput(speq->thread);
        } else
                speq->tid = queue->tid;

        if ((!speq->thread) && (speq->tid != -1)) {
                speq->thread = machine__find_thread(spe->machine, -1,
                                                    speq->tid);
        }

        if (speq->thread) {
                speq->pid = speq->thread->pid_;
                if (queue->cpu == -1)
                        speq->cpu = speq->thread->cpu;
        }
}

static int arm_spe_process_queues(struct arm_spe *spe, u64 timestamp)
{
        unsigned int queue_nr;
        u64 ts;
        int ret;

        while (1) {
                struct auxtrace_queue *queue;
                struct arm_spe_queue *speq;

                if (!spe->heap.heap_cnt)
                        return 0;

                if (spe->heap.heap_array[0].ordinal >= timestamp)
                        return 0;

                queue_nr = spe->heap.heap_array[0].queue_nr;
                queue = &spe->queues.queue_array[queue_nr];
                speq = queue->priv;

                auxtrace_heap__pop(&spe->heap);

                if (spe->heap.heap_cnt) {
                        ts = spe->heap.heap_array[0].ordinal + 1;
                        if (ts > timestamp)
                                ts = timestamp;
                } else {
                        ts = timestamp;
                }

                arm_spe_set_pid_tid_cpu(spe, queue);

                ret = arm_spe_run_decoder(speq, &ts);
                if (ret < 0) {
                        auxtrace_heap__add(&spe->heap, queue_nr, ts);
                        return ret;
                }

                if (!ret) {
                        ret = auxtrace_heap__add(&spe->heap, queue_nr, ts);
                        if (ret < 0)
                                return ret;
                } else {
                        speq->on_heap = false;
                }
        }

        return 0;
}

static int arm_spe_process_timeless_queues(struct arm_spe *spe, pid_t tid,
                                            u64 time_)
{
        struct auxtrace_queues *queues = &spe->queues;
        unsigned int i;
        u64 ts = 0;

        for (i = 0; i < queues->nr_queues; i++) {
                struct auxtrace_queue *queue = &spe->queues.queue_array[i];
                struct arm_spe_queue *speq = queue->priv;

                if (speq && (tid == -1 || speq->tid == tid)) {
                        speq->time = time_;
                        arm_spe_set_pid_tid_cpu(spe, queue);
                        arm_spe_run_decoder(speq, &ts);
                }
        }
        return 0;
}

static int arm_spe_process_event(struct perf_session *session,
                                 union perf_event *event,
                                 struct perf_sample *sample,
                                 struct perf_tool *tool)
{
        int err = 0;
        u64 timestamp;
        struct arm_spe *spe = container_of(session->auxtrace,
                        struct arm_spe, auxtrace);

        if (dump_trace)
                return 0;

        if (!tool->ordered_events) {
                pr_err("SPE trace requires ordered events\n");
                return -EINVAL;
        }

        if (sample->time && (sample->time != (u64) -1))
                timestamp = perf_time_to_tsc(sample->time, &spe->tc);
        else
                timestamp = 0;

        if (timestamp || spe->timeless_decoding) {
                err = arm_spe__update_queues(spe);
                if (err)
                        return err;
        }

        if (spe->timeless_decoding) {
                if (event->header.type == PERF_RECORD_EXIT) {
                        err = arm_spe_process_timeless_queues(spe,
                                        event->fork.tid,
                                        sample->time);
                }
        } else if (timestamp) {
                err = arm_spe_process_queues(spe, timestamp);
        }

        return err;
}

static int arm_spe_process_auxtrace_event(struct perf_session *session,
                                          union perf_event *event,
                                          struct perf_tool *tool __maybe_unused)
{
        struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
                                             auxtrace);

        if (!spe->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(&spe->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)) {
                                arm_spe_dump_event(spe, buffer->data,
                                                buffer->size);
                                auxtrace_buffer__put_data(buffer);
                        }
                }
        }

        return 0;
}

static int arm_spe_flush(struct perf_session *session __maybe_unused,
                         struct perf_tool *tool __maybe_unused)
{
        struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
                        auxtrace);
        int ret;

        if (dump_trace)
                return 0;

        if (!tool->ordered_events)
                return -EINVAL;

        ret = arm_spe__update_queues(spe);
        if (ret < 0)
                return ret;

        if (spe->timeless_decoding)
                return arm_spe_process_timeless_queues(spe, -1,
                                MAX_TIMESTAMP - 1);

        return arm_spe_process_queues(spe, MAX_TIMESTAMP);
}

static void arm_spe_free_queue(void *priv)
{
        struct arm_spe_queue *speq = priv;

        if (!speq)
                return;
        thread__zput(speq->thread);
        arm_spe_decoder_free(speq->decoder);
        zfree(&speq->event_buf);
        free(speq);
}

static void arm_spe_free_events(struct perf_session *session)
{
        struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
                                             auxtrace);
        struct auxtrace_queues *queues = &spe->queues;
        unsigned int i;

        for (i = 0; i < queues->nr_queues; i++) {
                arm_spe_free_queue(queues->queue_array[i].priv);
                queues->queue_array[i].priv = NULL;
        }
        auxtrace_queues__free(queues);
}

static void arm_spe_free(struct perf_session *session)
{
        struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe,
                                             auxtrace);

        auxtrace_heap__free(&spe->heap);
        arm_spe_free_events(session);
        session->auxtrace = NULL;
        free(spe);
}

static bool arm_spe_evsel_is_auxtrace(struct perf_session *session,
                                      struct evsel *evsel)
{
        struct arm_spe *spe = container_of(session->auxtrace, struct arm_spe, auxtrace);

        return evsel->core.attr.type == spe->pmu_type;
}

static const char * const arm_spe_info_fmts[] = {
        [ARM_SPE_PMU_TYPE]              = "  PMU Type           %"PRId64"\n",
};

static void arm_spe_print_info(__u64 *arr)
{
        if (!dump_trace)
                return;

        fprintf(stdout, arm_spe_info_fmts[ARM_SPE_PMU_TYPE], arr[ARM_SPE_PMU_TYPE]);
}

struct arm_spe_synth {
        struct perf_tool dummy_tool;
        struct perf_session *session;
};

static int arm_spe_event_synth(struct perf_tool *tool,
                               union perf_event *event,
                               struct perf_sample *sample __maybe_unused,
                               struct machine *machine __maybe_unused)
{
        struct arm_spe_synth *arm_spe_synth =
                      container_of(tool, struct arm_spe_synth, dummy_tool);

        return perf_session__deliver_synth_event(arm_spe_synth->session,
                                                 event, NULL);
}

static int arm_spe_synth_event(struct perf_session *session,
                               struct perf_event_attr *attr, u64 id)
{
        struct arm_spe_synth arm_spe_synth;

        memset(&arm_spe_synth, 0, sizeof(struct arm_spe_synth));
        arm_spe_synth.session = session;

        return perf_event__synthesize_attr(&arm_spe_synth.dummy_tool, attr, 1,
                                           &id, arm_spe_event_synth);
}

static void arm_spe_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 int
arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
{
        struct evlist *evlist = session->evlist;
        struct evsel *evsel;
        struct perf_event_attr attr;
        bool found = false;
        u64 id;
        int err;

        evlist__for_each_entry(evlist, evsel) {
                if (evsel->core.attr.type == spe->pmu_type) {
                        found = true;
                        break;
                }
        }

        if (!found) {
                pr_debug("No selected events with SPE 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 | PERF_SAMPLE_DATA_SRC;
        if (spe->timeless_decoding)
                attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
        else
                attr.sample_type |= PERF_SAMPLE_TIME;

        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;

        /* create new id val to be a fixed offset from evsel id */
        id = evsel->core.id[0] + 1000000000;

        if (!id)
                id = 1;

        if (spe->synth_opts.flc) {
                spe->sample_flc = true;

                /* Level 1 data cache miss */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->l1d_miss_id = id;
                arm_spe_set_event_name(evlist, id, "l1d-miss");
                id += 1;

                /* Level 1 data cache access */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->l1d_access_id = id;
                arm_spe_set_event_name(evlist, id, "l1d-access");
                id += 1;
        }

        if (spe->synth_opts.llc) {
                spe->sample_llc = true;

                /* Last level cache miss */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->llc_miss_id = id;
                arm_spe_set_event_name(evlist, id, "llc-miss");
                id += 1;

                /* Last level cache access */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->llc_access_id = id;
                arm_spe_set_event_name(evlist, id, "llc-access");
                id += 1;
        }

        if (spe->synth_opts.tlb) {
                spe->sample_tlb = true;

                /* TLB miss */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->tlb_miss_id = id;
                arm_spe_set_event_name(evlist, id, "tlb-miss");
                id += 1;

                /* TLB access */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->tlb_access_id = id;
                arm_spe_set_event_name(evlist, id, "tlb-access");
                id += 1;
        }

        if (spe->synth_opts.branches) {
                spe->sample_branch = true;

                /* Branch miss */

                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->branch_miss_id = id;
                arm_spe_set_event_name(evlist, id, "branch-miss");
                id += 1;
        }

        if (spe->synth_opts.remote_access) {
                spe->sample_remote_access = true;

                /* Remote access */
                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->remote_access_id = id;
                arm_spe_set_event_name(evlist, id, "remote-access");
                id += 1;
        }

        if (spe->synth_opts.mem) {
                spe->sample_memory = true;

                err = arm_spe_synth_event(session, &attr, id);
                if (err)
                        return err;
                spe->memory_id = id;
                arm_spe_set_event_name(evlist, id, "memory");
        }

        return 0;
}

int arm_spe_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) * ARM_SPE_AUXTRACE_PRIV_MAX;
        struct perf_record_time_conv *tc = &session->time_conv;
        struct arm_spe *spe;
        int err;

        if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
                                        min_sz)
                return -EINVAL;

        spe = zalloc(sizeof(struct arm_spe));
        if (!spe)
                return -ENOMEM;

        err = auxtrace_queues__init(&spe->queues);
        if (err)
                goto err_free;

        spe->session = session;
        spe->machine = &session->machines.host; /* No kvm support */
        spe->auxtrace_type = auxtrace_info->type;
        spe->pmu_type = auxtrace_info->priv[ARM_SPE_PMU_TYPE];

        spe->timeless_decoding = arm_spe__is_timeless_decoding(spe);

        /*
         * The synthesized event PERF_RECORD_TIME_CONV has been handled ahead
         * and the parameters for hardware clock are stored in the session
         * context.  Passes these parameters to the struct perf_tsc_conversion
         * in "spe->tc", which is used for later conversion between clock
         * counter and timestamp.
         *
         * For backward compatibility, copies the fields starting from
         * "time_cycles" only if they are contained in the event.
         */
        spe->tc.time_shift = tc->time_shift;
        spe->tc.time_mult = tc->time_mult;
        spe->tc.time_zero = tc->time_zero;

        if (event_contains(*tc, time_cycles)) {
                spe->tc.time_cycles = tc->time_cycles;
                spe->tc.time_mask = tc->time_mask;
                spe->tc.cap_user_time_zero = tc->cap_user_time_zero;
                spe->tc.cap_user_time_short = tc->cap_user_time_short;
        }

        spe->auxtrace.process_event = arm_spe_process_event;
        spe->auxtrace.process_auxtrace_event = arm_spe_process_auxtrace_event;
        spe->auxtrace.flush_events = arm_spe_flush;
        spe->auxtrace.free_events = arm_spe_free_events;
        spe->auxtrace.free = arm_spe_free;
        spe->auxtrace.evsel_is_auxtrace = arm_spe_evsel_is_auxtrace;
        session->auxtrace = &spe->auxtrace;

        arm_spe_print_info(&auxtrace_info->priv[0]);

        if (dump_trace)
                return 0;

        if (session->itrace_synth_opts && session->itrace_synth_opts->set)
                spe->synth_opts = *session->itrace_synth_opts;
        else
                itrace_synth_opts__set_default(&spe->synth_opts, false);

        err = arm_spe_synth_events(spe, session);
        if (err)
                goto err_free_queues;

        err = auxtrace_queues__process_index(&spe->queues, session);
        if (err)
                goto err_free_queues;

        if (spe->queues.populated)
                spe->data_queued = true;

        return 0;

err_free_queues:
        auxtrace_queues__free(&spe->queues);
        session->auxtrace = NULL;
err_free:
        free(spe);
        return err;
}