/*
 *
 * builtin-bench.c
 *
 * General benchmarking subsystem provided by perf
 *
 * Copyright (C) 2009, Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
 *
 */

/*
 *
 * Available subsystem list:
 *  sched ... scheduler and IPC mechanism
 *  mem   ... memory access performance
 *
 */

#include "perf.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "builtin.h"
#include "bench/bench.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct bench_suite {
        const char *name;
        const char *summary;
        int (*fn)(int, const char **, const char *);
};
                                                \
/* sentinel: easy for help */
#define suite_all { "all", "test all suite (pseudo suite)", NULL }

static struct bench_suite sched_suites[] = {
        { "messaging",
          "Benchmark for scheduler and IPC mechanisms",
          bench_sched_messaging },
        { "pipe",
          "Flood of communication over pipe() between two processes",
          bench_sched_pipe      },
        suite_all,
        { NULL,
          NULL,
          NULL                  }
};

static struct bench_suite mem_suites[] = {
        { "memcpy",
          "Simple memory copy in various ways",
          bench_mem_memcpy },
        suite_all,
        { NULL,
          NULL,
          NULL             }
};

struct bench_subsys {
        const char *name;
        const char *summary;
        struct bench_suite *suites;
};

static struct bench_subsys subsystems[] = {
        { "sched",
          "scheduler and IPC mechanism",
          sched_suites },
        { "mem",
          "memory access performance",
          mem_suites },
        { "all",                /* sentinel: easy for help */
          "test all subsystem (pseudo subsystem)",
          NULL },
        { NULL,
          NULL,
          NULL       }
};

static void dump_suites(int subsys_index)
{
        int i;

        printf("# List of available suites for %s...\n\n",
               subsystems[subsys_index].name);

        for (i = 0; subsystems[subsys_index].suites[i].name; i++)
                printf("%14s: %s\n",
                       subsystems[subsys_index].suites[i].name,
                       subsystems[subsys_index].suites[i].summary);

        printf("\n");
        return;
}

static const char *bench_format_str;
int bench_format = BENCH_FORMAT_DEFAULT;

static const struct option bench_options[] = {
        OPT_STRING('f', "format", &bench_format_str, "default",
                    "Specify format style"),
        OPT_END()
};

static const char * const bench_usage[] = {
        "perf bench [<common options>] <subsystem> <suite> [<options>]",
        NULL
};

static void print_usage(void)
{
        int i;

        printf("Usage: \n");
        for (i = 0; bench_usage[i]; i++)
                printf("\t%s\n", bench_usage[i]);
        printf("\n");

        printf("# List of available subsystems...\n\n");

        for (i = 0; subsystems[i].name; i++)
                printf("%14s: %s\n",
                       subsystems[i].name, subsystems[i].summary);
        printf("\n");
}

static int bench_str2int(const char *str)
{
        if (!str)
                return BENCH_FORMAT_DEFAULT;

        if (!strcmp(str, BENCH_FORMAT_DEFAULT_STR))
                return BENCH_FORMAT_DEFAULT;
        else if (!strcmp(str, BENCH_FORMAT_SIMPLE_STR))
                return BENCH_FORMAT_SIMPLE;

        return BENCH_FORMAT_UNKNOWN;
}

static void all_suite(struct bench_subsys *subsys)        /* FROM HERE */
{
        int i;
        const char *argv[2];
        struct bench_suite *suites = subsys->suites;

        argv[1] = NULL;
        /*
         * TODO:
         * preparing preset parameters for
         * embedded, ordinary PC, HPC, etc...
         * will be helpful
         */
        for (i = 0; suites[i].fn; i++) {
                printf("# Running %s/%s benchmark...\n",
                       subsys->name,
                       suites[i].name);

                argv[1] = suites[i].name;
                suites[i].fn(1, argv, NULL);
                printf("\n");
        }
}

static void all_subsystem(void)
{
        int i;
        for (i = 0; subsystems[i].suites; i++)
                all_suite(&subsystems[i]);
}

int cmd_bench(int argc, const char **argv, const char *prefix __used)
{
        int i, j, status = 0;

        if (argc < 2) {
                /* No subsystem specified. */
                print_usage();
                goto end;
        }

        argc = parse_options(argc, argv, bench_options, bench_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);

        bench_format = bench_str2int(bench_format_str);
        if (bench_format == BENCH_FORMAT_UNKNOWN) {
                printf("Unknown format descriptor:%s\n", bench_format_str);
                goto end;
        }

        if (argc < 1) {
                print_usage();
                goto end;
        }

        if (!strcmp(argv[0], "all")) {
                all_subsystem();
                goto end;
        }

        for (i = 0; subsystems[i].name; i++) {
                if (strcmp(subsystems[i].name, argv[0]))
                        continue;

                if (argc < 2) {
                        /* No suite specified. */
                        dump_suites(i);
                        goto end;
                }

                if (!strcmp(argv[1], "all")) {
                        all_suite(&subsystems[i]);
                        goto end;
                }

                for (j = 0; subsystems[i].suites[j].name; j++) {
                        if (strcmp(subsystems[i].suites[j].name, argv[1]))
                                continue;

                        if (bench_format == BENCH_FORMAT_DEFAULT)
                                printf("# Running %s/%s benchmark...\n",
                                       subsystems[i].name,
                                       subsystems[i].suites[j].name);
                        status = subsystems[i].suites[j].fn(argc - 1,
                                                            argv + 1, prefix);
                        goto end;
                }

                if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
                        dump_suites(i);
                        goto end;
                }

                printf("Unknown suite:%s for %s\n", argv[1], argv[0]);
                status = 1;
                goto end;
        }

        printf("Unknown subsystem:%s\n", argv[0]);
        status = 1;

end:
        return status;
}