/*

 * Copyright (C) 2019 Intel Corporation.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * 1. Redistributions of source code must retain the above copyright notice(s),

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice(s),

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO

 * EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#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 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;

}