/*
 * KMAPINFO.C
 *
 * cc -I/usr/src/sys kmapinfo.c -o ~/bin/kmapinfo -lkvm
 *
 * Dump the kernel_map
 *
 * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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 HOLDERS OR CONTRIBUTORS 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.
 */

#define _KERNEL_STRUCTURES_
#include <sys/param.h>
#include <sys/user.h>
#include <sys/malloc.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/namecache.h>

#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/swap_pager.h>
#include <vm/vnode_pager.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <kvm.h>
#include <nlist.h>
#include <getopt.h>

struct nlist Nl[] = {
    { "_kernel_map" },
    { NULL }
};

int debugopt;
int verboseopt;
struct vm_map kmap;
vm_offset_t total_empty;
vm_offset_t total_used;
vm_offset_t total_real;
vm_offset_t total_used_byid[VM_SUBSYS_LIMIT];

static const char *formatnum(int64_t value);
static const char *entryid(vm_subsys_t id, int *realmemp);
static void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
static void mapscan(kvm_t *kd, vm_map_entry_t kptr, vm_map_entry_t ken,
                    vm_offset_t *lastp);

int
main(int ac, char **av)
{
    const char *corefile = NULL;
    const char *sysfile = NULL;
    kvm_t *kd;
    int ch;
    int i;
    vm_offset_t last;
    struct vm_map_entry entry;
    struct vm_map_entry *kptr;

    while ((ch = getopt(ac, av, "M:N:dv")) != -1) {
        switch(ch) {
        case 'd':
            ++debugopt;
            break;
        case 'v':
            ++verboseopt;
            break;
        case 'M':
            corefile = optarg;
            break;
        case 'N':
            sysfile = optarg;
            break;
        default:
            fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
            exit(1);
        }
    }
    ac -= optind;
    av += optind;

    if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
        perror("kvm_open");
        exit(1);
    }
    if (kvm_nlist(kd, Nl) != 0) {
        perror("kvm_nlist");
        exit(1);
    }
    kkread(kd, Nl[0].n_value, &kmap, sizeof(kmap));
    last = kmap.min_addr;

    kptr = kvm_vm_map_entry_first(kd, &kmap, &entry);
    while (kptr) {
        mapscan(kd, kptr, &entry, &last);
        kptr = kvm_vm_map_entry_next(kd, kptr, &entry);
    }

    printf("%4ldM 0x%016jx %08lx-%08lx (%6s) EMPTY\n",
        total_used / 1024 / 1024,
        (intmax_t)NULL,
        last, kmap.max_addr,
        formatnum(kmap.max_addr - last));
    total_empty += kmap.max_addr - last;

    printf("-----------------------------------------------\n");
    for (i = 0; i < VM_SUBSYS_LIMIT; ++i) {
        int realmem;
        const char *id = entryid(i, &realmem);

        printf("Total-id: %9s %s%s\n",
                id,
                formatnum(total_used_byid[i]),
                (realmem ? " (real memory)" : ""));
    }

    printf("-----------------------------------------------\n");
    printf("Total empty space: %s\n", formatnum(total_empty));
    printf("Total used  space: %s\n", formatnum(total_used));
    printf("Total real  space: %s\n", formatnum(total_real));
}

static const char *
formatnum(int64_t value)
{
        static char buf[64];
        const char *neg;
        const char *suffix;
        int64_t div = 1;

        if (value < 0) {
                value = -value;
                neg = "-";
        } else {
                neg = "";
        }
        if (value < 100000) {
                div = 1;
                suffix = "";
        } else if (value < 1 * 1024 * 1024) {
                div = 1024;
                suffix = "K";
        } else if (value < 1024 * 1024 * 1024) {
                div = 1024 * 1024;
                suffix = "M";
        } else if (value < 1024LL * 1024 * 1024 * 1024) {
                div = 1024 * 1024 * 1024;
                suffix = "G";
        } else {
                div = 1024LL * 1024 * 1024 * 1024;
                suffix = "T";
        }
        if (value == 0) {
                snprintf(buf, sizeof(buf), "");
        } else if (div == 1) {
                snprintf(buf, sizeof(buf), "%s%7.0f%s",
                         neg,
                         (double)value / (double)div,
                         suffix);
        } else {
                snprintf(buf, sizeof(buf), "%s%6.2f%s",
                         neg,
                         (double)value / (double)div,
                         suffix);
        }
        return buf;
}

static void
mapscan(kvm_t *kd, vm_map_entry_t kptr, vm_map_entry_t ken, vm_offset_t *lastp)
{
    int realmem;

    if (*lastp != ken->ba.start) {
            printf("%4ldM %p %08lx-%08lx (%s) EMPTY\n",
                total_used / 1024 / 1024,
                kptr,
                *lastp, ken->ba.start,
                formatnum(ken->ba.start - *lastp));
            total_empty += ken->ba.start - *lastp;
    }
    printf("%4ldM %p %08lx-%08lx (%6ldK) id=%-8s object=%p\n",
        total_used / 1024 / 1024,
        kptr,
        ken->ba.start, ken->ba.end,
        (ken->ba.end - ken->ba.start) / 1024,
        entryid(ken->id, &realmem),
        ken->ba.map_object);
    total_used += ken->ba.end - ken->ba.start;

    if (ken->id < VM_SUBSYS_LIMIT)
        total_used_byid[ken->id] += ken->ba.end - ken->ba.start;
    else
        total_used_byid[0] += ken->ba.end - ken->ba.start;

    if (realmem)
        total_real += ken->ba.end - ken->ba.start;

    *lastp = ken->ba.end;
}

static
const char *
entryid(vm_subsys_t id, int *realmemp)
{
        static char buf[32];
        int dummy = 0;
        int *realmem = (realmemp ? realmemp : &dummy);

        *realmem = 0;

        switch(id) {
        case VM_SUBSYS_UNKNOWN:
                return("UNKNOWN");
        case VM_SUBSYS_KMALLOC:
                *realmem = 1;
                return("KMALLOC");
        case VM_SUBSYS_STACK:
                *realmem = 1;
                return("STACK");
        case VM_SUBSYS_IMGACT:
                return("IMGACT");
        case VM_SUBSYS_EFI:
                return("EFI");
        case VM_SUBSYS_RESERVED:
                *realmem = 1;
                return("BOOT+KERN");
        case VM_SUBSYS_INIT:
                return("INIT");
        case VM_SUBSYS_PIPE:
                return("PIPE");
        case VM_SUBSYS_PROC:
                return("PROC");
        case VM_SUBSYS_SHMEM:
                return("SHMEM");
        case VM_SUBSYS_SYSMAP:
                return("SYSMAP");
        case VM_SUBSYS_MMAP:
                return("MMAP");
        case VM_SUBSYS_BRK:
                return("BRK");
        case VM_SUBSYS_BOGUS:
                return("BOGUS");
        case VM_SUBSYS_BUF:
                *realmem = 1;
                return("BUF");
        case VM_SUBSYS_BUFDATA:
                return("BUFDATA");
        case VM_SUBSYS_GD:
                *realmem = 1;
                return("GD");
        case VM_SUBSYS_IPIQ:
                *realmem = 1;
                return("IPIQ");
        case VM_SUBSYS_PVENTRY:
                return("PVENTRY");
        case VM_SUBSYS_PML4:
                *realmem = 1;
                return("PML4");
        case VM_SUBSYS_MAPDEV:
                return("MAPDEV");
        case VM_SUBSYS_ZALLOC:
                return("ZALLOC");

        case VM_SUBSYS_DM:
                return("DM");
        case VM_SUBSYS_CONTIG:
                return("CONTIG");
        case VM_SUBSYS_DRM:
                return("DRM");
        case VM_SUBSYS_DRM_GEM:
                return("DRM_GEM");
        case VM_SUBSYS_DRM_SCAT:
                return("DRM_SCAT");
        case VM_SUBSYS_DRM_VMAP:
                *realmem = 1;
                return("DRM_VMAP");
        case VM_SUBSYS_DRM_TTM:
                return("DRM_TTM");
        case VM_SUBSYS_HAMMER:
                return("HAMMER");
        case VM_SUBSYS_VMPGHASH:
                *realmem = 1;
                return("VMPGHASH");
        default:
                break;
        }
        snprintf(buf, sizeof(buf), "%d", (int)id);

        return buf;
}


static void
kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
{
    if (kvm_read(kd, addr, buf, nbytes) != nbytes) {
        perror("kvm_read");
        exit(1);
    }
}