// SPDX-License-Identifier: BSD-2-Clause

/* Copyright (C) 2019 - 2020 Intel Corporation. */

#include <memkind/internal/memkind_dax_kmem.h>

#include <memkind.h>

#include <numa.h>

#include <stdio.h>

#define MAX_ARG_LEN 8

static const char *const help_message =

    "\n"

    "NAME\n"

    "    memkind-auto-dax-kmem-nodes - prints comma-separated list of automatically detected persistent memory NUMA nodes.\n"

    "\n"

    "SYNOPSIS\n"

    "    memkind-auto-dax-kmem-nodes -h | --help\n"

    "        Prints this help message.\n"

    "\n"

    "DESCRIPTION\n"

    "    Prints a comma-separated list of automatically detected persistent memory NUMA nodes\n"

    "    that can be used with the numactl --membind option.\n"

    "\n"

    "EXIT STATUS\n"

    "    Return code is :\n"

    "        0 on success\n"

    "        1 if automatic detection is disabled (memkind wasn't build with suitable libdaxctl-devel version)\n"

    "        2 on invalid argument\n"

    "        3 on other failure\n"

    "\n"

    "COPYRIGHT\n"

    "    Copyright 2019 - 2020 Intel Corporation All Rights Reserved.\n"

    "\n"

    "AUTHORS\n"

    "    Michal Biesek\n"

    "\n"

    "SEE ALSO\n"

    "    memkind(3)\n"

    "\n";

static int print_dax_kmem_nodes()

{

    unsigned i, j = 0;

    nodemask_t nodemask;

    struct bitmask nodemask_dax_kmem = {NUMA_NUM_NODES, nodemask.n};

    // ensuring functions in numa library are defined

    if (numa_available() == -1) {

        return 3;

    }

    numa_bitmask_clearall(&nodemask_dax_kmem);

    //WARNING: code below is usage of memkind experimental API which may be changed in future

    int status = memkind_dax_kmem_all_get_mbind_nodemask(NULL, nodemask.n,

                                                         NUMA_NUM_NODES);

    if (status == MEMKIND_ERROR_OPERATION_FAILED ) {

        return 1;

    } else if (status != MEMKIND_SUCCESS ) {

        return 3;

    }

    for(i = 0; i

        if(numa_bitmask_isbitset(&nodemask_dax_kmem, i)) {

            printf("%u%s", i, (++j == numa_bitmask_weight(&nodemask_dax_kmem)) ? "" : ",");

        }

    }

    printf("\n");

    return 0;

}

int main(int argc, char *argv[])

{

    if(argc == 1) {

        return print_dax_kmem_nodes();

    } else if ((argc == 2) && (strncmp(argv[1], "-h", MAX_ARG_LEN) == 0 ||

                               strncmp(argv[1], "--help", MAX_ARG_LEN) == 0)) {

        printf("%s", help_message);

        return 0;

    }

    printf("ERROR: Unknown option %s. More info with \"%s --help\".\n", argv[1],

           argv[0]);

    return 2;

}