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lspci.c

/*
 *    $Id: lspci.c,v 1.43 2002/12/26 20:24:50 mj Exp $
 *
 *    Linux PCI Utilities -- List All PCI Devices
 *
 *    Copyright (c) 1997--2002 Martin Mares <mj@ucw.cz>
 *
 *    Can be freely distributed and used under the terms of the GNU GPL.
 */

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

#include "pciutils.h"

/* Options */

static int verbose;                 /* Show detailed information */
static int buscentric_view;         /* Show bus addresses/IRQ's instead of CPU-visible ones */
static int show_hex;                /* Show contents of config space as hexadecimal numbers */
static struct pci_filter filter;    /* Device filter */
static int show_tree;               /* Show bus tree */
static int machine_readable;        /* Generate machine-readable output */
static int map_mode;                /* Bus mapping mode enabled */
static int xfree86configformat;           /* Format suitable for use in XFree86Config */

static char options[] = "nvbxs:d:ti:mgMX" GENERIC_OPTIONS ;

static char help_msg[] = "\
Usage: lspci [<switches>]\n\
\n\
-v\t\tBe verbose\n\
-n\t\tShow numeric ID's\n\
-b\t\tBus-centric view (PCI addresses and IRQ's instead of those seen by the CPU)\n\
-x\t\tShow hex-dump of the standard portion of config space\n\
-xxx\t\tShow hex-dump of the whole config space (dangerous; root only)\n\
-s [[<bus>]:][<slot>][.[<func>]]\tShow only devices in selected slots\n\
-d [<vendor>]:[<device>]\tShow only selected devices\n\
-t\t\tShow bus tree\n\
-X\t\tShow in format suitable for use in XFree86Config\n\
-m\t\tProduce machine-readable output\n\
-i <file>\tUse specified ID database instead of %s\n\
-M\t\tEnable `bus mapping' mode (dangerous; root only)\n"
GENERIC_HELP
;

/* Communication with libpci */

static struct pci_access *pacc;

/* Format strings used for IRQ numbers and memory addresses */

#ifdef ARCH_SPARC64
#define IRQ_FORMAT "%08x"
#else
#define IRQ_FORMAT "%d"
#endif

#ifdef HAVE_64BIT_ADDRESS
#ifdef HAVE_LONG_ADDRESS
#define ADDR_FORMAT "%016Lx"
#else
#define ADDR_FORMAT "%016lx"
#endif
#else
#define ADDR_FORMAT "%08lx"
#endif

#ifdef ARCH_SPARC64
#define IO_FORMAT "%016Lx"
#elif defined(HAVE_LONG_ADDRESS)
#define IO_FORMAT "%04Lx"
#else
#define IO_FORMAT "%04lx"
#endif

/*
 *  If we aren't being compiled by GCC, use malloc() instead of alloca().
 *  This increases our memory footprint, but only slightly since we don't
 *  use alloca() much.
 */

#ifndef __GNUC__
#define alloca malloc
#endif

/* Our view of the PCI bus */

struct device {
  struct device *next;
  struct pci_dev *dev;
  unsigned int config_cnt;
  byte config[256];
};

static struct device *first_dev;

static struct device *
scan_device(struct pci_dev *p)
{
  int how_much = (show_hex > 2) ? 256 : 64;
  struct device *d;

  if (!pci_filter_match(&filter, p))
    return NULL;
  d = xmalloc(sizeof(struct device));
  bzero(d, sizeof(*d));
  d->dev = p;
  if (!pci_read_block(p, 0, d->config, how_much)) {
     fprintf(stderr, "Unable to read %d bytes of configuration space.",
          how_much);
     return NULL;
  }
  if (how_much < 128 && (d->config[PCI_HEADER_TYPE] & 0x7f) == PCI_HEADER_TYPE_CARDBUS)
    {
      /* For cardbus bridges, we need to fetch 64 bytes more to get the full standard header... */
      if (!pci_read_block(p, 64, d->config+64, 64))
      die("Unable to read cardbus bridge extension data.");
      how_much = 128;
    }
  d->config_cnt = how_much;
  pci_setup_cache(p, d->config, d->config_cnt);
  pci_fill_info(p, PCI_FILL_IDENT | PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES);
  return d;
}

static void
scan_devices(void)
{
  struct device *d;
  struct pci_dev *p;

  pci_scan_bus(pacc);
  for(p=pacc->devices; p; p=p->next)
    if (d = scan_device(p))
      {
      d->next = first_dev;
      first_dev = d;
      }
}

static int
check_root(void)
{
  static int is_root = -1;

  if (is_root < 0)
    is_root = !geteuid();
  return is_root;
}

static int
config_fetch(struct device *d, unsigned int pos, unsigned int len)
{
  if (pos + len < d->config_cnt)
    return 1;
  if (pacc->method != PCI_ACCESS_DUMP && !check_root())
    return 0;
  return pci_read_block(d->dev, pos, d->config + pos, len);
}

/* Config space accesses */

static inline byte
get_conf_byte(struct device *d, unsigned int pos)
{
  return d->config[pos];
}

static word
get_conf_word(struct device *d, unsigned int pos)
{
  return d->config[pos] | (d->config[pos+1] << 8);
}

static u32
get_conf_long(struct device *d, unsigned int pos)
{
  return d->config[pos] |
    (d->config[pos+1] << 8) |
    (d->config[pos+2] << 16) |
    (d->config[pos+3] << 24);
}

/* Sorting */

static int
compare_them(const void *A, const void *B)
{
  const struct pci_dev *a = (*(const struct device **)A)->dev;
  const struct pci_dev *b = (*(const struct device **)B)->dev;

  if (a->domain < b->domain)
    return -1;
  if (a->domain > b->domain)
    return 1;
  if (a->bus < b->bus)
    return -1;
  if (a->bus > b->bus)
    return 1;
  if (a->dev < b->dev)
    return -1;
  if (a->dev > b->dev)
    return 1;
  if (a->func < b->func)
    return -1;
  if (a->func > b->func)
    return 1;
  return 0;
}

static void
sort_them(void)
{
  struct device **index, **h, **last_dev;
  int cnt;
  struct device *d;

  cnt = 0;
  for(d=first_dev; d; d=d->next)
    cnt++;
  h = index = alloca(sizeof(struct device *) * cnt);
  for(d=first_dev; d; d=d->next)
    *h++ = d;
  qsort(index, cnt, sizeof(struct device *), compare_them);
  last_dev = &first_dev;
  h = index;
  while (cnt--)
    {
      *last_dev = *h;
      last_dev = &(*h)->next;
      h++;
    }
  *last_dev = NULL;
}

/* Output for XFree86Config, see debian bug #251828 */
static void
show_xfree86configformat(struct device *d)
{
  struct pci_dev *p = d->dev;
  byte classbuf[128], devbuf[128];
 
  printf("PCI:%d:%d:%d %s: %s",
         p->bus,
         p->dev,
         p->func,
         pci_lookup_name(pacc, classbuf, sizeof(classbuf),
                         PCI_LOOKUP_CLASS,
                         get_conf_word(d, PCI_CLASS_DEVICE), 0, 0, 0),
         pci_lookup_name(pacc, devbuf, sizeof(devbuf),
                         PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
                         p->vendor_id, p->device_id, 0, 0));
  putchar('\n');
}

/* Normal output */

#define FLAG(x,y) ((x & y) ? '+' : '-')

static void
show_terse(struct device *d)
{
  int c;
  struct pci_dev *p = d->dev;
  byte classbuf[128], devbuf[128];

  printf("%04x:%02x:%02x.%x %s: %s",
       p->domain,
       p->bus,
       p->dev,
       p->func,
       pci_lookup_name(pacc, classbuf, sizeof(classbuf),
                   PCI_LOOKUP_CLASS,
                   get_conf_word(d, PCI_CLASS_DEVICE), 0, 0, 0),
       pci_lookup_name(pacc, devbuf, sizeof(devbuf),
                   PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
                   p->vendor_id, p->device_id, 0, 0));
  if (c = get_conf_byte(d, PCI_REVISION_ID))
    printf(" (rev %02x)", c);
  if (verbose)
    {
      char *x;
      c = get_conf_byte(d, PCI_CLASS_PROG);
      x = pci_lookup_name(pacc, devbuf, sizeof(devbuf),
                    PCI_LOOKUP_PROGIF,
                    get_conf_word(d, PCI_CLASS_DEVICE), c, 0, 0);
      if (c || x)
      {
        printf(" (prog-if %02x", c);
        if (x)
          printf(" [%s]", x);
        putchar(')');
      }
    }
  putchar('\n');
}

static void
show_size(pciaddr_t x)
{
  if (!x)
    return;
  printf(" [size=");
  if (x < 1024)
    printf("%d", (int) x);
  else if (x < 1048576)
    printf("%dK", (int)(x / 1024));
  else if (x < 0x80000000)
    printf("%dM", (int)(x / 1048576));
  else
    printf(ADDR_FORMAT, x);
  putchar(']');
}

static void
show_bases(struct device *d, int cnt)
{
  struct pci_dev *p = d->dev;
  word cmd = get_conf_word(d, PCI_COMMAND);
  int i;

  for(i=0; i<cnt; i++)
    {
      pciaddr_t pos = p->base_addr[i];
      pciaddr_t len = (p->known_fields & PCI_FILL_SIZES) ? p->size[i] : 0;
      u32 flg = get_conf_long(d, PCI_BASE_ADDRESS_0 + 4*i);
      if (flg == 0xffffffff)
      flg = 0;
      if (!pos && !flg && !len)
      continue;
      if (verbose > 1)
      printf("\tRegion %d: ", i);
      else
      putchar('\t');
      if (pos && !flg)              /* Reported by the OS, but not by the device */
      {
        printf("[virtual] ");
        flg = pos;
      }
      if (flg & PCI_BASE_ADDRESS_SPACE_IO)
      {
        pciaddr_t a = pos & PCI_BASE_ADDRESS_IO_MASK;
        printf("I/O ports at ");
        if (a)
          printf(IO_FORMAT, a);
        else if (flg & PCI_BASE_ADDRESS_IO_MASK)
          printf("<ignored>");
        else
          printf("<unassigned>");
        if (!(cmd & PCI_COMMAND_IO))
          printf(" [disabled]");
      }
      else
      {
        int t = flg & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
        pciaddr_t a = pos & PCI_ADDR_MEM_MASK;
        int done = 0;
        u32 z = 0;

        printf("Memory at ");
        if (t == PCI_BASE_ADDRESS_MEM_TYPE_64)
          {
            if (i >= cnt - 1)
            {
              printf("<invalid-64bit-slot>");
              done = 1;
            }
            else
            {
              i++;
              z = get_conf_long(d, PCI_BASE_ADDRESS_0 + 4*i);
              if (buscentric_view)
                {
                  if (a || z)
                  printf("%08x" ADDR_FORMAT, z, a);
                  else
                  printf("<unassigned>");
                  done = 1;
                }
            }
          }
        if (!done)
          {
            if (a)
            printf(ADDR_FORMAT, a);
            else
            printf(((flg & PCI_BASE_ADDRESS_MEM_MASK) || z) ? "<ignored>" : "<unassigned>");
          }
        printf(" (%s, %sprefetchable)",
             (t == PCI_BASE_ADDRESS_MEM_TYPE_32) ? "32-bit" :
             (t == PCI_BASE_ADDRESS_MEM_TYPE_64) ? "64-bit" :
             (t == PCI_BASE_ADDRESS_MEM_TYPE_1M) ? "low-1M" : "type 3",
             (flg & PCI_BASE_ADDRESS_MEM_PREFETCH) ? "" : "non-");
        if (!(cmd & PCI_COMMAND_MEMORY))
          printf(" [disabled]");
      }
      show_size(len);
      putchar('\n');
    }
}

static void
show_pm(struct device *d, int where, int cap)
{
  int t, b;
  static int pm_aux_current[8] = { 0, 55, 100, 160, 220, 270, 320, 375 };

  printf("Power Management version %d\n", cap & PCI_PM_CAP_VER_MASK);
  if (verbose < 2)
    return;
  printf("\t\tFlags: PMEClk%c DSI%c D1%c D2%c AuxCurrent=%dmA PME(D0%c,D1%c,D2%c,D3hot%c,D3cold%c)\n",
       FLAG(cap, PCI_PM_CAP_PME_CLOCK),
       FLAG(cap, PCI_PM_CAP_DSI),
       FLAG(cap, PCI_PM_CAP_D1),
       FLAG(cap, PCI_PM_CAP_D2),
       pm_aux_current[(cap >> 6) & 7],
       FLAG(cap, PCI_PM_CAP_PME_D0),
       FLAG(cap, PCI_PM_CAP_PME_D1),
       FLAG(cap, PCI_PM_CAP_PME_D2),
       FLAG(cap, PCI_PM_CAP_PME_D3_HOT),
       FLAG(cap, PCI_PM_CAP_PME_D3_COLD));
  config_fetch(d, where + PCI_PM_CTRL, PCI_PM_SIZEOF - PCI_PM_CTRL);
  t = get_conf_word(d, where + PCI_PM_CTRL);
  printf("\t\tStatus: D%d PME-Enable%c DSel=%d DScale=%d PME%c\n",
       t & PCI_PM_CTRL_STATE_MASK,
       FLAG(t, PCI_PM_CTRL_PME_ENABLE),
       (t & PCI_PM_CTRL_DATA_SEL_MASK) >> 9,
       (t & PCI_PM_CTRL_DATA_SCALE_MASK) >> 13,
       FLAG(t, PCI_PM_CTRL_PME_STATUS));
  b = get_conf_byte(d, where + PCI_PM_PPB_EXTENSIONS);
  if (b)
    printf("\t\tBridge: PM%c B3%c\n",
         FLAG(t, PCI_PM_BPCC_ENABLE),
         FLAG(~t, PCI_PM_PPB_B2_B3));
}

static void
format_agp_rate(int rate, char *buf, int agp3)
{
  char *c = buf;
  int i;

  for(i=0; i<=2; i++)
    if (rate & (1 << i))
      {
      if (c != buf)
        *c++ = ',';
      *c++ = 'x';
      *c++ = '0' + (1 << (i + 2*agp3));
      }
  if (c != buf)
    *c = 0;
  else
    strcpy(buf, "<none>");
}

static void
show_agp(struct device *d, int where, int cap)
{
  u32 t;
  char rate[8];
  int ver, rev;
  int agp3 = 0;

  ver = (cap >> 4) & 0x0f;
  rev = cap & 0x0f;
  printf("AGP version %x.%x\n", ver, rev);
  if (verbose < 2)
    return;
  config_fetch(d, where + PCI_AGP_STATUS, PCI_AGP_SIZEOF - PCI_AGP_STATUS);
  t = get_conf_long(d, where + PCI_AGP_STATUS);
  if (ver >= 3 && (t & PCI_AGP_STATUS_AGP3))
    agp3 = 1;
  format_agp_rate(t & 7, rate, agp3);
  printf("\t\tStatus: RQ=%d Iso%c ArqSz=%d Cal=%d SBA%c ITACoh%c GART64%c HTrans%c 64bit%c FW%c AGP3%c Rate=%s\n",
       ((t & PCI_AGP_STATUS_RQ_MASK) >> 24U) + 1,
       FLAG(t, PCI_AGP_STATUS_ISOCH),
       ((t & PCI_AGP_STATUS_ARQSZ_MASK) >> 13),
       ((t & PCI_AGP_STATUS_CAL_MASK) >> 10),
       FLAG(t, PCI_AGP_STATUS_SBA),
       FLAG(t, PCI_AGP_STATUS_ITA_COH),
       FLAG(t, PCI_AGP_STATUS_GART64),
       FLAG(t, PCI_AGP_STATUS_HTRANS),
       FLAG(t, PCI_AGP_STATUS_64BIT),
       FLAG(t, PCI_AGP_STATUS_FW),
       FLAG(t, PCI_AGP_STATUS_AGP3),
       rate);
  t = get_conf_long(d, where + PCI_AGP_COMMAND);
  format_agp_rate(t & 7, rate, agp3);
  printf("\t\tCommand: RQ=%d ArqSz=%d Cal=%d SBA%c AGP%c GART64%c 64bit%c FW%c Rate=%s\n",
       ((t & PCI_AGP_COMMAND_RQ_MASK) >> 24U) + 1,
       ((t & PCI_AGP_COMMAND_ARQSZ_MASK) >> 13),
       ((t & PCI_AGP_COMMAND_CAL_MASK) >> 10),
       FLAG(t, PCI_AGP_COMMAND_SBA),
       FLAG(t, PCI_AGP_COMMAND_AGP),
       FLAG(t, PCI_AGP_COMMAND_GART64),
       FLAG(t, PCI_AGP_COMMAND_64BIT),
       FLAG(t, PCI_AGP_COMMAND_FW),
       rate);
}

static void
show_pcix_nobridge(struct device *d, int where)
{
  u16 command;
  u32 status;
  printf("PCI-X non-bridge device.\n");
  if (verbose < 2)
    return;
  config_fetch(d, where + PCI_PCIX_COMMAND, 2);
  command = get_conf_word(d, where + PCI_PCIX_COMMAND);
  config_fetch(d, where + PCI_PCIX_STATUS, 4);
  status = get_conf_long(d, where + PCI_PCIX_STATUS);
  printf("\t\tCommand: DPERE%c ERO%c RBC=%d OST=%d\n",
       FLAG(command, PCI_PCIX_COMMAND_DPERE),
       FLAG(command, PCI_PCIX_COMMAND_ERO),
       ((command & PCI_PCIX_COMMAND_MAX_MEM_READ_BYTE_COUNT) >> 2U),
       ((command & PCI_PCIX_COMMAND_MAX_OUTSTANDING_SPLIT_TRANS) >> 4U));
  printf("\t\tStatus: Bus=%u Dev=%u Func=%u 64bit%c 133MHz%c SCD%c USC%c, DC=%s, DMMRBC=%u, DMOST=%u, DMCRS=%u, RSCEM%c\n",
       ((status >> 8) & 0xffU), // bus
       ((status >> 3) & 0x1fU), // dev
       (status & PCI_PCIX_BRIDGE_STATUS_FUNCTION), // function
       FLAG(status, PCI_PCIX_STATUS_64BIT),
       FLAG(status, PCI_PCIX_STATUS_133MHZ),
       FLAG(status, PCI_PCIX_STATUS_SC_DISCARDED),
       FLAG(status, PCI_PCIX_STATUS_UNEXPECTED_SC),
       ((status & PCI_PCIX_STATUS_DEVICE_COMPLEXITY) ? "bridge" : "simple"),
       ((status >> 21) & 3U),
       ((status >> 23) & 7U),
       ((status >> 26) & 7U),
       FLAG(status, PCI_PCIX_STATUS_RCVD_SC_ERR_MESS));
}

static void
show_pcix_bridge(struct device *d, int where)
{
  u16 secstatus;
  u32 status, upstcr, downstcr;
  printf("PCI-X bridge device.\n");
  if (verbose < 2)
    return;
  config_fetch(d, where + PCI_PCIX_BRIDGE_SEC_STATUS, 2);
  secstatus = get_conf_word(d, where + PCI_PCIX_BRIDGE_SEC_STATUS);
  printf("\t\tSecondary Status: 64bit%c, 133MHz%c, SCD%c, USC%c, SCO%c, SRD%c Freq=%d\n",
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_64BIT),
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_133MHZ),
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_SC_DISCARDED),
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_UNEXPECTED_SC),
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_SC_OVERRUN),
       FLAG(secstatus, PCI_PCIX_BRIDGE_SEC_STATUS_SPLIT_REQUEST_DELAYED),
       ((secstatus >> 6) & 7));
  config_fetch(d, where + PCI_PCIX_BRIDGE_STATUS, 4);
  status = get_conf_long(d, where + PCI_PCIX_BRIDGE_STATUS);
  printf("\t\tStatus: Bus=%u Dev=%u Func=%u 64bit%c 133MHz%c SCD%c USC%c, SCO%c, SRD%c\n", 
       ((status >> 8) & 0xff), // bus
       ((status >> 3) & 0x1f), // dev
       (status & PCI_PCIX_BRIDGE_STATUS_FUNCTION), // function
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_64BIT),
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_133MHZ),
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_SC_DISCARDED),
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_UNEXPECTED_SC),
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_SC_OVERRUN),
       FLAG(status, PCI_PCIX_BRIDGE_STATUS_SPLIT_REQUEST_DELAYED));
  config_fetch(d, where + PCI_PCIX_BRIDGE_UPSTREAM_SPLIT_TRANS_CTRL, 4);
  upstcr = get_conf_long(d, where + PCI_PCIX_BRIDGE_UPSTREAM_SPLIT_TRANS_CTRL);
  printf("\t\t: Upstream: Capacity=%u, Commitment Limit=%u\n",
       (upstcr & PCI_PCIX_BRIDGE_STR_CAPACITY),
       (upstcr >> 16) & 0xffff);
  config_fetch(d, where + PCI_PCIX_BRIDGE_DOWNSTREAM_SPLIT_TRANS_CTRL, 4);
  downstcr = get_conf_long(d, where + PCI_PCIX_BRIDGE_DOWNSTREAM_SPLIT_TRANS_CTRL);
  printf("\t\t: Downstream: Capacity=%u, Commitment Limit=%u\n",
       (downstcr & PCI_PCIX_BRIDGE_STR_CAPACITY),
       (downstcr >> 16) & 0xffff);
}

static void
show_pcix(struct device *d, int where)
{
  switch (d->dev->hdrtype)
    {
    case PCI_HEADER_TYPE_NORMAL:
      show_pcix_nobridge(d, where);
      break;
    case PCI_HEADER_TYPE_BRIDGE:
      show_pcix_bridge(d, where);
      break;
    }
}

static void
show_rom(struct device *d)
{
  struct pci_dev *p = d->dev;
  pciaddr_t rom = p->rom_base_addr;
  pciaddr_t len = (p->known_fields & PCI_FILL_SIZES) ? p->rom_size : 0;

  if (!rom && !len)
    return;
  printf("\tExpansion ROM at ");
  if (rom & PCI_ROM_ADDRESS_MASK)
    printf(ADDR_FORMAT, rom & PCI_ROM_ADDRESS_MASK);
  else
    printf("<unassigned>");
  if (!(rom & PCI_ROM_ADDRESS_ENABLE))
    printf(" [disabled]");
  show_size(len);
  putchar('\n');
}

static void
show_msi(struct device *d, int where, int cap)
{
  int is64;
  u32 t;
  u16 w;

  printf("Message Signalled Interrupts: 64bit%c Queue=%d/%d Enable%c\n",
       FLAG(cap, PCI_MSI_FLAGS_64BIT),
       (cap & PCI_MSI_FLAGS_QSIZE) >> 4,
       (cap & PCI_MSI_FLAGS_QMASK) >> 1,
       FLAG(cap, PCI_MSI_FLAGS_ENABLE));
  if (verbose < 2)
    return;
  is64 = cap & PCI_MSI_FLAGS_64BIT;
  config_fetch(d, where + PCI_MSI_ADDRESS_LO, (is64 ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32) + 2 - PCI_MSI_ADDRESS_LO);
  printf("\t\tAddress: ");
  if (is64)
    {
      t = get_conf_long(d, where + PCI_MSI_ADDRESS_HI);
      w = get_conf_word(d, where + PCI_MSI_DATA_64);
      printf("%08x", t);
    }
  else
    w = get_conf_word(d, where + PCI_MSI_DATA_32);
  t = get_conf_long(d, where + PCI_MSI_ADDRESS_LO);
  printf("%08x  Data: %04x\n", t, w);
}

static void
show_slotid(int cap)
{
  int esr = cap & 0xff;
  int chs = cap >> 8;

  printf("Slot ID: %d slots, First%c, chassis %02x\n",
       esr & PCI_SID_ESR_NSLOTS,
       FLAG(esr, PCI_SID_ESR_FIC),
       chs);
}

static void
show_caps(struct device *d)
{
  if (get_conf_word(d, PCI_STATUS) & PCI_STATUS_CAP_LIST)
    {
      int where = get_conf_byte(d, PCI_CAPABILITY_LIST) & ~3;
      while (where)
      {
        int id, next, cap;
        printf("\tCapabilities: ");
        if (!config_fetch(d, where, 4))
          {
            puts("<available only to root>");
            break;
          }
        id = get_conf_byte(d, where + PCI_CAP_LIST_ID);
        next = get_conf_byte(d, where + PCI_CAP_LIST_NEXT) & ~3;
        cap = get_conf_word(d, where + PCI_CAP_FLAGS);
        printf("[%02x] ", where);
        if (id == 0xff)
          {
            printf("<chain broken>\n");
            break;
          }
        switch (id)
          {
          case PCI_CAP_ID_PM:
            show_pm(d, where, cap);
            break;
          case PCI_CAP_ID_AGP:
            show_agp(d, where, cap);
            break;
          case PCI_CAP_ID_VPD:
            printf("Vital Product Data\n");
            break;
          case PCI_CAP_ID_SLOTID:
            show_slotid(cap);
            break;
          case PCI_CAP_ID_MSI:
            show_msi(d, where, cap);
            break;
          case PCI_CAP_ID_PCIX:
            show_pcix(d, where);
            break;
          default:
            printf("#%02x [%04x]\n", id, cap);
          }
        where = next;
      }
    }
}

static void
show_htype0(struct device *d)
{
  show_bases(d, 6);
  show_rom(d);
  show_caps(d);
}

static void
show_htype1(struct device *d)
{
  u32 io_base = get_conf_byte(d, PCI_IO_BASE);
  u32 io_limit = get_conf_byte(d, PCI_IO_LIMIT);
  u32 io_type = io_base & PCI_IO_RANGE_TYPE_MASK;
  u32 mem_base = get_conf_word(d, PCI_MEMORY_BASE);
  u32 mem_limit = get_conf_word(d, PCI_MEMORY_LIMIT);
  u32 mem_type = mem_base & PCI_MEMORY_RANGE_TYPE_MASK;
  u32 pref_base = get_conf_word(d, PCI_PREF_MEMORY_BASE);
  u32 pref_limit = get_conf_word(d, PCI_PREF_MEMORY_LIMIT);
  u32 pref_type = pref_base & PCI_PREF_RANGE_TYPE_MASK;
  word brc = get_conf_word(d, PCI_BRIDGE_CONTROL);
  int verb = verbose > 2;

  show_bases(d, 2);
  printf("\tBus: primary=%02x, secondary=%02x, subordinate=%02x, sec-latency=%d\n",
       get_conf_byte(d, PCI_PRIMARY_BUS),
       get_conf_byte(d, PCI_SECONDARY_BUS),
       get_conf_byte(d, PCI_SUBORDINATE_BUS),
       get_conf_byte(d, PCI_SEC_LATENCY_TIMER));

  if (io_type != (io_limit & PCI_IO_RANGE_TYPE_MASK) ||
      (io_type != PCI_IO_RANGE_TYPE_16 && io_type != PCI_IO_RANGE_TYPE_32))
    printf("\t!!! Unknown I/O range types %x/%x\n", io_base, io_limit);
  else
    {
      io_base = (io_base & PCI_IO_RANGE_MASK) << 8;
      io_limit = (io_limit & PCI_IO_RANGE_MASK) << 8;
      if (io_type == PCI_IO_RANGE_TYPE_32)
      {
        io_base |= (get_conf_word(d, PCI_IO_BASE_UPPER16) << 16);
        io_limit |= (get_conf_word(d, PCI_IO_LIMIT_UPPER16) << 16);
      }
      if (io_base <= io_limit || verb)
      printf("\tI/O behind bridge: %08x-%08x\n", io_base, io_limit+0xfff);
    }

  if (mem_type != (mem_limit & PCI_MEMORY_RANGE_TYPE_MASK) ||
      mem_type)
    printf("\t!!! Unknown memory range types %x/%x\n", mem_base, mem_limit);
  else
    {
      mem_base = (mem_base & PCI_MEMORY_RANGE_MASK) << 16;
      mem_limit = (mem_limit & PCI_MEMORY_RANGE_MASK) << 16;
      if (mem_base <= mem_limit || verb)
      printf("\tMemory behind bridge: %08x-%08x\n", mem_base, mem_limit + 0xfffff);
    }

  if (pref_type != (pref_limit & PCI_PREF_RANGE_TYPE_MASK) ||
      (pref_type != PCI_PREF_RANGE_TYPE_32 && pref_type != PCI_PREF_RANGE_TYPE_64))
    printf("\t!!! Unknown prefetchable memory range types %x/%x\n", pref_base, pref_limit);
  else
    {
      pref_base = (pref_base & PCI_PREF_RANGE_MASK) << 16;
      pref_limit = (pref_limit & PCI_PREF_RANGE_MASK) << 16;
      if (pref_base <= pref_limit || verb)
      {
        if (pref_type == PCI_PREF_RANGE_TYPE_32)
          printf("\tPrefetchable memory behind bridge: %08x-%08x\n", pref_base, pref_limit + 0xfffff);
        else
          printf("\tPrefetchable memory behind bridge: %08x%08x-%08x%08x\n",
               get_conf_long(d, PCI_PREF_BASE_UPPER32),
               pref_base,
               get_conf_long(d, PCI_PREF_LIMIT_UPPER32),
               pref_limit);
      }
    }

  if (get_conf_word(d, PCI_SEC_STATUS) & PCI_STATUS_SIG_SYSTEM_ERROR)
    printf("\tSecondary status: SERR\n");

  show_rom(d);

  if (verbose > 1)
    printf("\tBridgeCtl: Parity%c SERR%c NoISA%c VGA%c MAbort%c >Reset%c FastB2B%c\n",
         FLAG(brc, PCI_BRIDGE_CTL_PARITY),
         FLAG(brc, PCI_BRIDGE_CTL_SERR),
         FLAG(brc, PCI_BRIDGE_CTL_NO_ISA),
         FLAG(brc, PCI_BRIDGE_CTL_VGA),
         FLAG(brc, PCI_BRIDGE_CTL_MASTER_ABORT),
         FLAG(brc, PCI_BRIDGE_CTL_BUS_RESET),
         FLAG(brc, PCI_BRIDGE_CTL_FAST_BACK));

  show_caps(d);
}

static void
show_htype2(struct device *d)
{
  int i;
  word cmd = get_conf_word(d, PCI_COMMAND);
  word brc = get_conf_word(d, PCI_CB_BRIDGE_CONTROL);
  word exca = get_conf_word(d, PCI_CB_LEGACY_MODE_BASE);
  int verb = verbose > 2;

  show_bases(d, 1);
  printf("\tBus: primary=%02x, secondary=%02x, subordinate=%02x, sec-latency=%d\n",
       get_conf_byte(d, PCI_CB_PRIMARY_BUS),
       get_conf_byte(d, PCI_CB_CARD_BUS),
       get_conf_byte(d, PCI_CB_SUBORDINATE_BUS),
       get_conf_byte(d, PCI_CB_LATENCY_TIMER));
  for(i=0; i<2; i++)
    {
      int p = 8*i;
      u32 base = get_conf_long(d, PCI_CB_MEMORY_BASE_0 + p);
      u32 limit = get_conf_long(d, PCI_CB_MEMORY_LIMIT_0 + p);
      if (limit > base || verb)
      printf("\tMemory window %d: %08x-%08x%s%s\n", i, base, limit,
             (cmd & PCI_COMMAND_MEMORY) ? "" : " [disabled]",
             (brc & (PCI_CB_BRIDGE_CTL_PREFETCH_MEM0 << i)) ? " (prefetchable)" : "");
    }
  for(i=0; i<2; i++)
    {
      int p = 8*i;
      u32 base = get_conf_long(d, PCI_CB_IO_BASE_0 + p);
      u32 limit = get_conf_long(d, PCI_CB_IO_LIMIT_0 + p);
      if (!(base & PCI_IO_RANGE_TYPE_32))
      {
        base &= 0xffff;
        limit &= 0xffff;
      }
      base &= PCI_CB_IO_RANGE_MASK;
      limit = (limit & PCI_CB_IO_RANGE_MASK) + 3;
      if (base <= limit || verb)
      printf("\tI/O window %d: %08x-%08x%s\n", i, base, limit,
             (cmd & PCI_COMMAND_IO) ? "" : " [disabled]");
    }

  if (get_conf_word(d, PCI_CB_SEC_STATUS) & PCI_STATUS_SIG_SYSTEM_ERROR)
    printf("\tSecondary status: SERR\n");
  if (verbose > 1)
    printf("\tBridgeCtl: Parity%c SERR%c ISA%c VGA%c MAbort%c >Reset%c 16bInt%c PostWrite%c\n",
         FLAG(brc, PCI_CB_BRIDGE_CTL_PARITY),
         FLAG(brc, PCI_CB_BRIDGE_CTL_SERR),
         FLAG(brc, PCI_CB_BRIDGE_CTL_ISA),
         FLAG(brc, PCI_CB_BRIDGE_CTL_VGA),
         FLAG(brc, PCI_CB_BRIDGE_CTL_MASTER_ABORT),
         FLAG(brc, PCI_CB_BRIDGE_CTL_CB_RESET),
         FLAG(brc, PCI_CB_BRIDGE_CTL_16BIT_INT),
         FLAG(brc, PCI_CB_BRIDGE_CTL_POST_WRITES));
  if (exca)
    printf("\t16-bit legacy interface ports at %04x\n", exca);
}

static void
show_verbose(struct device *d)
{
  struct pci_dev *p = d->dev;
  word status = get_conf_word(d, PCI_STATUS);
  word cmd = get_conf_word(d, PCI_COMMAND);
  word class = get_conf_word(d, PCI_CLASS_DEVICE);
  byte bist = get_conf_byte(d, PCI_BIST);
  byte htype = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f;
  byte latency = get_conf_byte(d, PCI_LATENCY_TIMER);
  byte cache_line = get_conf_byte(d, PCI_CACHE_LINE_SIZE);
  byte max_lat, min_gnt;
  byte int_pin = get_conf_byte(d, PCI_INTERRUPT_PIN);
  unsigned int irq = p->irq;
  word subsys_v, subsys_d;
  char ssnamebuf[256];

  show_terse(d);

  switch (htype)
    {
    case PCI_HEADER_TYPE_NORMAL:
      if (class == PCI_CLASS_BRIDGE_PCI)
      printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
      max_lat = get_conf_byte(d, PCI_MAX_LAT);
      min_gnt = get_conf_byte(d, PCI_MIN_GNT);
      subsys_v = get_conf_word(d, PCI_SUBSYSTEM_VENDOR_ID);
      subsys_d = get_conf_word(d, PCI_SUBSYSTEM_ID);
      break;
    case PCI_HEADER_TYPE_BRIDGE:
      if (class != PCI_CLASS_BRIDGE_PCI)
      printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
      irq = int_pin = min_gnt = max_lat = 0;
      subsys_v = subsys_d = 0;
      break;
    case PCI_HEADER_TYPE_CARDBUS:
      if ((class >> 8) != PCI_BASE_CLASS_BRIDGE)
      printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
      min_gnt = max_lat = 0;
      subsys_v = get_conf_word(d, PCI_CB_SUBSYSTEM_VENDOR_ID);
      subsys_d = get_conf_word(d, PCI_CB_SUBSYSTEM_ID);
      break;
    default:
      printf("\t!!! Unknown header type %02x\n", htype);
      return;
    }

  if (subsys_v && subsys_v != 0xffff)
    printf("\tSubsystem: %s\n",
         pci_lookup_name(pacc, ssnamebuf, sizeof(ssnamebuf),
                     PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
                     p->vendor_id, p->device_id, subsys_v, subsys_d));

  if (verbose > 1)
    {
      printf("\tControl: I/O%c Mem%c BusMaster%c SpecCycle%c MemWINV%c VGASnoop%c ParErr%c Stepping%c SERR%c FastB2B%c\n",
           FLAG(cmd, PCI_COMMAND_IO),
           FLAG(cmd, PCI_COMMAND_MEMORY),
           FLAG(cmd, PCI_COMMAND_MASTER),
           FLAG(cmd, PCI_COMMAND_SPECIAL),
           FLAG(cmd, PCI_COMMAND_INVALIDATE),
           FLAG(cmd, PCI_COMMAND_VGA_PALETTE),
           FLAG(cmd, PCI_COMMAND_PARITY),
           FLAG(cmd, PCI_COMMAND_WAIT),
           FLAG(cmd, PCI_COMMAND_SERR),
           FLAG(cmd, PCI_COMMAND_FAST_BACK));
      printf("\tStatus: Cap%c 66MHz%c UDF%c FastB2B%c ParErr%c DEVSEL=%s >TAbort%c <TAbort%c <MAbort%c >SERR%c <PERR%c\n",
           FLAG(status, PCI_STATUS_CAP_LIST),
           FLAG(status, PCI_STATUS_66MHZ),
           FLAG(status, PCI_STATUS_UDF),
           FLAG(status, PCI_STATUS_FAST_BACK),
           FLAG(status, PCI_STATUS_PARITY),
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_SLOW) ? "slow" :
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_MEDIUM) ? "medium" :
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_FAST) ? "fast" : "??",
           FLAG(status, PCI_STATUS_SIG_TARGET_ABORT),
           FLAG(status, PCI_STATUS_REC_TARGET_ABORT),
           FLAG(status, PCI_STATUS_REC_MASTER_ABORT),
           FLAG(status, PCI_STATUS_SIG_SYSTEM_ERROR),
           FLAG(status, PCI_STATUS_DETECTED_PARITY));
      if (cmd & PCI_COMMAND_MASTER)
      {
        printf("\tLatency: %d", latency);
        if (min_gnt || max_lat)
          {
            printf(" (");
            if (min_gnt)
            printf("%dns min", min_gnt*250);
            if (min_gnt && max_lat)
            printf(", ");
            if (max_lat)
            printf("%dns max", max_lat*250);
            putchar(')');
          }
        if (cache_line)
          printf(", Cache Line Size: 0x%02x (%d bytes)", cache_line, cache_line * 4);
        putchar('\n');
      }
      if (int_pin || irq)
      printf("\tInterrupt: pin %c routed to IRQ " IRQ_FORMAT "\n",
             (int_pin ? 'A' + int_pin - 1 : '?'), irq);
    }
  else
    {
      printf("\tFlags: ");
      if (cmd & PCI_COMMAND_MASTER)
      printf("bus master, ");
      if (cmd & PCI_COMMAND_VGA_PALETTE)
      printf("VGA palette snoop, ");
      if (cmd & PCI_COMMAND_WAIT)
      printf("stepping, ");
      if (cmd & PCI_COMMAND_FAST_BACK)
      printf("fast Back2Back, ");
      if (status & PCI_STATUS_66MHZ)
      printf("66MHz, ");
      if (status & PCI_STATUS_UDF)
      printf("user-definable features, ");
      printf("%s devsel",
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_SLOW) ? "slow" :
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_MEDIUM) ? "medium" :
           ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_FAST) ? "fast" : "??");
      if (cmd & PCI_COMMAND_MASTER)
      printf(", latency %d", latency);
      if (irq)
      printf(", IRQ " IRQ_FORMAT, irq);
      putchar('\n');
    }

  if (bist & PCI_BIST_CAPABLE)
    {
      if (bist & PCI_BIST_START)
      printf("\tBIST is running\n");
      else
      printf("\tBIST result: %02x\n", bist & PCI_BIST_CODE_MASK);
    }

  switch (htype)
    {
    case PCI_HEADER_TYPE_NORMAL:
      show_htype0(d);
      break;
    case PCI_HEADER_TYPE_BRIDGE:
      show_htype1(d);
      break;
    case PCI_HEADER_TYPE_CARDBUS:
      show_htype2(d);
      break;
    }
}

static void
show_hex_dump(struct device *d)
{
  unsigned int i;

  for(i=0; i<d->config_cnt; i++)
    {
      if (! (i & 15))
      printf("%02x:", i);
      printf(" %02x", get_conf_byte(d, i));
      if ((i & 15) == 15)
      putchar('\n');
    }
}

static void
show_machine(struct device *d)
{
  struct pci_dev *p = d->dev;
  int c;
  word sv_id=0, sd_id=0;
  char classbuf[128], vendbuf[128], devbuf[128], svbuf[128], sdbuf[128];

  switch (get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f)
    {
    case PCI_HEADER_TYPE_NORMAL:
      sv_id = get_conf_word(d, PCI_SUBSYSTEM_VENDOR_ID);
      sd_id = get_conf_word(d, PCI_SUBSYSTEM_ID);
      break;
    case PCI_HEADER_TYPE_CARDBUS:
      sv_id = get_conf_word(d, PCI_CB_SUBSYSTEM_VENDOR_ID);
      sd_id = get_conf_word(d, PCI_CB_SUBSYSTEM_ID);
      break;
    }

  if (verbose)
    {
      printf("Device:\t%02x:%02x.%x\n", p->bus, p->dev, p->func);
      printf("Class:\t%s\n",
           pci_lookup_name(pacc, classbuf, sizeof(classbuf), PCI_LOOKUP_CLASS, get_conf_word(d, PCI_CLASS_DEVICE), 0, 0, 0));
      printf("Vendor:\t%s\n",
           pci_lookup_name(pacc, vendbuf, sizeof(vendbuf), PCI_LOOKUP_VENDOR, p->vendor_id, p->device_id, 0, 0));
      printf("Device:\t%s\n",
           pci_lookup_name(pacc, devbuf, sizeof(devbuf), PCI_LOOKUP_DEVICE, p->vendor_id, p->device_id, 0, 0));
      if (sv_id && sv_id != 0xffff)
      {
        printf("SVendor:\t%s\n",
             pci_lookup_name(pacc, svbuf, sizeof(svbuf), PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_VENDOR, p->vendor_id, p->device_id, sv_id, sd_id));
        printf("SDevice:\t%s\n",
             pci_lookup_name(pacc, sdbuf, sizeof(sdbuf), PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_DEVICE, p->vendor_id, p->device_id, sv_id, sd_id));
      }
      if (c = get_conf_byte(d, PCI_REVISION_ID))
      printf("Rev:\t%02x\n", c);
      if (c = get_conf_byte(d, PCI_CLASS_PROG))
      printf("ProgIf:\t%02x\n", c);
    }
  else
    {
      printf("%02x:%02x.%x ", p->bus, p->dev, p->func);
      printf("%s %s %s",
           pci_lookup_name(pacc, classbuf, sizeof(classbuf), PCI_LOOKUP_CLASS,
                       get_conf_word(d, PCI_CLASS_DEVICE), 0, 0, 0),
           pci_lookup_name(pacc, vendbuf, sizeof(vendbuf), PCI_LOOKUP_VENDOR,
                       p->vendor_id, p->device_id, 0, 0),
           pci_lookup_name(pacc, devbuf, sizeof(devbuf), PCI_LOOKUP_DEVICE,
                       p->vendor_id, p->device_id, 0, 0));
      if (c = get_conf_byte(d, PCI_REVISION_ID))
      printf(" %02x", c);
      else
      printf(" 00");
      if (c = get_conf_byte(d, PCI_CLASS_PROG))
      printf(" %02x", c);
      else
      printf(" 00");
      if (sv_id && sv_id != 0xffff)
      printf(" %s %s",
             pci_lookup_name(pacc, svbuf, sizeof(svbuf), PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_VENDOR, p->vendor_id, p->device_id, sv_id, sd_id),
             pci_lookup_name(pacc, sdbuf, sizeof(sdbuf), PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_DEVICE, p->vendor_id, p->device_id, sv_id, sd_id));
      else
      printf(" 0000 0000");
      putchar('\n');
    }
}

static void
show_device(struct device *d)
{
  if (xfree86configformat)
    show_xfree86configformat(d);
  else if (machine_readable)
    show_machine(d);
  else if (verbose)
    show_verbose(d);
  else
    show_terse(d);
  if (show_hex)
    show_hex_dump(d);
  if (verbose || show_hex)
    putchar('\n');
}

static void
show(void)
{
  struct device *d;

  for(d=first_dev; d; d=d->next)
    show_device(d);
}

/* Tree output */

struct bridge {
  struct bridge *chain;             /* Single-linked list of bridges */
  struct bridge *next, *child;            /* Tree of bridges */
  struct bus *first_bus;            /* List of busses connected to this bridge */
  unsigned int primary, secondary, subordinate; /* Bus numbers */
  struct device *br_dev;
};

struct bus {
  unsigned int number;
  struct bus *sibling;
  struct device *first_dev, **last_dev;
};

static struct bridge host_bridge = { NULL, NULL, NULL, NULL, ~0, 0, ~0, NULL };

static struct bus *
find_bus(struct bridge *b, unsigned int n)
{
  struct bus *bus;

  for(bus=b->first_bus; bus; bus=bus->sibling)
    if (bus->number == n)
      break;
  return bus;
}

static struct bus *
new_bus(struct bridge *b, unsigned int n)
{
  struct bus *bus = xmalloc(sizeof(struct bus));

  bus = xmalloc(sizeof(struct bus));
  bus->number = n;
  bus->sibling = b->first_bus;
  bus->first_dev = NULL;
  bus->last_dev = &bus->first_dev;
  b->first_bus = bus;
  return bus;
}

static void
insert_dev(struct device *d, struct bridge *b)
{
  struct pci_dev *p = d->dev;
  struct bus *bus;

  if (! (bus = find_bus(b, p->bus)))
    {
      struct bridge *c;
      for(c=b->child; c; c=c->next)
      if (c->secondary <= p->bus && p->bus <= c->subordinate)
          {
            insert_dev(d, c);
            return;
          }
      bus = new_bus(b, p->bus);
    }
  /* Simple insertion at the end _does_ guarantee the correct order as the
   * original device list was sorted by (bus, devfn) lexicographically
   * and all devices on the new list have the same bus number.
   */
  *bus->last_dev = d;
  bus->last_dev = &d->next;
  d->next = NULL;
}

static void
grow_tree(void)
{
  struct device *d, *d2;
  struct bridge **last_br, *b;

  /* Build list of bridges */

  last_br = &host_bridge.chain;
  for(d=first_dev; d; d=d->next)
    {
      word class = get_conf_word(d, PCI_CLASS_DEVICE);
      byte ht = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f;
      if (class == PCI_CLASS_BRIDGE_PCI &&
        (ht == PCI_HEADER_TYPE_BRIDGE || ht == PCI_HEADER_TYPE_CARDBUS))
      {
        b = xmalloc(sizeof(struct bridge));
        if (ht == PCI_HEADER_TYPE_BRIDGE)
          {
            b->primary = get_conf_byte(d, PCI_CB_PRIMARY_BUS);
            b->secondary = get_conf_byte(d, PCI_CB_CARD_BUS);
            b->subordinate = get_conf_byte(d, PCI_CB_SUBORDINATE_BUS);
          }
        else
          {
            b->primary = get_conf_byte(d, PCI_PRIMARY_BUS);
            b->secondary = get_conf_byte(d, PCI_SECONDARY_BUS);
            b->subordinate = get_conf_byte(d, PCI_SUBORDINATE_BUS);
          }
        *last_br = b;
        last_br = &b->chain;
        b->next = b->child = NULL;
        b->first_bus = NULL;
        b->br_dev = d;
      }
    }
  *last_br = NULL;

  /* Create a bridge tree */

  for(b=&host_bridge; b; b=b->chain)
    {
      struct bridge *c, *best;
      best = NULL;
      for(c=&host_bridge; c; c=c->chain)
      if (c != b && b->primary >= c->secondary && b->primary <= c->subordinate &&
          (!best || best->subordinate - best->primary > c->subordinate - c->primary))
        best = c;
      if (best)
      {
        b->next = best->child;
        best->child = b;
      }
    }

  /* Insert secondary bus for each bridge */

  for(b=&host_bridge; b; b=b->chain)
    if (!find_bus(b, b->secondary))
      new_bus(b, b->secondary);

  /* Create bus structs and link devices */

  for(d=first_dev; d;)
    {
      d2 = d->next;
      insert_dev(d, &host_bridge);
      d = d2;
    }
}

static void
print_it(byte *line, byte *p)
{
  *p++ = '\n';
  *p = 0;
  fputs(line, stdout);
  for(p=line; *p; p++)
    if (*p == '+' || *p == '|')
      *p = '|';
    else
      *p = ' ';
}

static void show_tree_bridge(struct bridge *, byte *, byte *);

static void
show_tree_dev(struct device *d, byte *line, byte *p)
{
  struct pci_dev *q = d->dev;
  struct bridge *b;
  char namebuf[256];

  p += sprintf(p, "%02x.%x", q->dev, q->func);
  for(b=&host_bridge; b; b=b->chain)
    if (b->br_dev == d)
      {
      if (b->secondary == b->subordinate)
        p += sprintf(p, "-[%02x]-", b->secondary);
      else
        p += sprintf(p, "-[%02x-%02x]-", b->secondary, b->subordinate);
        show_tree_bridge(b, line, p);
        return;
      }
  if (verbose)
    p += sprintf(p, "  %s",
             pci_lookup_name(pacc, namebuf, sizeof(namebuf),
                         PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
                         q->vendor_id, q->device_id, 0, 0));
  print_it(line, p);
}

static void
show_tree_bus(struct bus *b, byte *line, byte *p)
{
  if (!b->first_dev)
    print_it(line, p);
  else if (!b->first_dev->next)
    {
      *p++ = '-';
      *p++ = '-';
      show_tree_dev(b->first_dev, line, p);
    }
  else
    {
      struct device *d = b->first_dev;
      while (d->next)
      {
        p[0] = '+';
        p[1] = '-';
        show_tree_dev(d, line, p+2);
        d = d->next;
      }
      p[0] = '\\';
      p[1] = '-';
      show_tree_dev(d, line, p+2);
    }
}

static void
show_tree_bridge(struct bridge *b, byte *line, byte *p)
{
  *p++ = '-';
  if (!b->first_bus->sibling)
    {
      if (b == &host_bridge)
        p += sprintf(p, "[%02x]-", b->first_bus->number);
      show_tree_bus(b->first_bus, line, p);
    }
  else
    {
      struct bus *u = b->first_bus;
      byte *k;

      while (u->sibling)
        {
          k = p + sprintf(p, "+-[%02x]-", u->number);
          show_tree_bus(u, line, k);
          u = u->sibling;
        }
      k = p + sprintf(p, "\\-[%02x]-", u->number);
      show_tree_bus(u, line, k);
    }
}

static void
show_forest(void)
{
  char line[256];

  grow_tree();
  show_tree_bridge(&host_bridge, line, line);
}

/* Bus mapping mode */

struct bus_bridge {
  struct bus_bridge *next;
  byte this, dev, func, first, last, bug;
};

struct bus_info {
  byte exists;
  byte guestbook;
  struct bus_bridge *bridges, *via;
};

static struct bus_info *bus_info;

static void
map_bridge(struct bus_info *bi, struct device *d, int np, int ns, int nl)
{
  struct bus_bridge *b = xmalloc(sizeof(struct bus_bridge));
  struct pci_dev *p = d->dev;

  b->next = bi->bridges;
  bi->bridges = b;
  b->this = get_conf_byte(d, np);
  b->dev = p->dev;
  b->func = p->func;
  b->first = get_conf_byte(d, ns);
  b->last = get_conf_byte(d, nl);
  printf("## %02x.%02x:%d is a bridge from %02x to %02x-%02x\n",
       p->bus, p->dev, p->func, b->this, b->first, b->last);
  if (b->this != p->bus)
    printf("!!! Bridge points to invalid primary bus.\n");
  if (b->first > b->last)
    {
      printf("!!! Bridge points to invalid bus range.\n");
      b->last = b->first;
    }
}

static void
do_map_bus(int bus)
{
  int dev, func;
  int verbose = pacc->debugging;
  struct bus_info *bi = bus_info + bus;
  struct device *d;

  if (verbose)
    printf("Mapping bus %02x\n", bus);
  for(dev = 0; dev < 32; dev++)
    if (filter.slot < 0 || filter.slot == dev)
      {
      int func_limit = 1;
      for(func = 0; func < func_limit; func++)
        if (filter.func < 0 || filter.func == func)
          {
            struct pci_dev *p = pci_get_dev(pacc, bus, dev, func);
            u16 vendor = pci_read_word(p, PCI_VENDOR_ID);
            if (vendor && vendor != 0xffff)
            {
              if (!func && (pci_read_byte(p, PCI_HEADER_TYPE) & 0x80))
                func_limit = 8;
              if (verbose)
                printf("Discovered device %02x:%02x.%d\n", bus, dev, func);
              bi->exists = 1;
              if (d = scan_device(p))
                {
                  show_device(d);
                  switch (get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f)
                  {
                  case PCI_HEADER_TYPE_BRIDGE:
                    map_bridge(bi, d, PCI_PRIMARY_BUS, PCI_SECONDARY_BUS, PCI_SUBORDINATE_BUS);
                    break;
                  case PCI_HEADER_TYPE_CARDBUS:
                    map_bridge(bi, d, PCI_CB_PRIMARY_BUS, PCI_CB_CARD_BUS, PCI_CB_SUBORDINATE_BUS);
                    break;
                  }
                  free(d);
                }
              else if (verbose)
                printf("But it was filtered out.\n");
            }
            pci_free_dev(p);
          }
      }
}

static void
do_map_bridges(int bus, int min, int max)
{
  struct bus_info *bi = bus_info + bus;
  struct bus_bridge *b;

  bi->guestbook = 1;
  for(b=bi->bridges; b; b=b->next)
    {
      if (bus_info[b->first].guestbook)
      b->bug = 1;
      else if (b->first < min || b->last > max)
      b->bug = 2;
      else
      {
        bus_info[b->first].via = b;
        do_map_bridges(b->first, b->first, b->last);
      }
    }
}

static void
map_bridges(void)
{
  int i;

  printf("\nSummary of buses:\n\n");
  for(i=0; i<256; i++)
    if (bus_info[i].exists && !bus_info[i].guestbook)
      do_map_bridges(i, 0, 255);
  for(i=0; i<256; i++)
    {
      struct bus_info *bi = bus_info + i;
      struct bus_bridge *b = bi->via;

      if (bi->exists)
      {
        printf("%02x: ", i);
        if (b)
          printf("Entered via %02x:%02x.%d\n", b->this, b->dev, b->func);
        else if (!i)
          printf("Primary host bus\n");
        else
          printf("Secondary host bus (?)\n");
      }
      for(b=bi->bridges; b; b=b->next)
      {
        printf("\t%02x.%d Bridge to %02x-%02x", b->dev, b->func, b->first, b->last);
        switch (b->bug)
          {
          case 1:
            printf(" <overlap bug>");
            break;
          case 2:
            printf(" <crossing bug>");
            break;
          }
        putchar('\n');
      }
    }
}

static void
map_the_bus(void)
{
  if (pacc->method == PCI_ACCESS_PROC_BUS_PCI ||
      pacc->method == PCI_ACCESS_DUMP)
    printf("WARNING: Bus mapping can be reliable only with direct hardware access enabled.\n\n");
  else if (!check_root())
    die("Only root can map the bus.");
  bus_info = xmalloc(sizeof(struct bus_info) * 256);
  bzero(bus_info, sizeof(struct bus_info) * 256);
  if (filter.bus >= 0)
    do_map_bus(filter.bus);
  else
    {
      int bus;
      for(bus=0; bus<256; bus++)
      do_map_bus(bus);
    }
  map_bridges();
}

/* Main */

int
main(int argc, char **argv)
{
  int i;
  char *msg;

  if (argc == 2 && !strcmp(argv[1], "--version"))
    {
      puts("lspci version " PCIUTILS_VERSION);
      return 0;
    }

  pacc = pci_alloc();
  pacc->error = die;
  pci_filter_init(pacc, &filter);

  while ((i = getopt(argc, argv, options)) != -1)
    switch (i)
      {
      case 'n':
      pacc->numeric_ids = 1;
      break;
      case 'v':
      verbose++;
      break;
      case 'b':
      pacc->buscentric = 1;
      buscentric_view = 1;
      break;
      case 's':
      if (msg = pci_filter_parse_slot(&filter, optarg))
        die("-f: %s", msg);
      break;
      case 'd':
      if (msg = pci_filter_parse_id(&filter, optarg))
        die("-d: %s", msg);
      break;
      case 'x':
      show_hex++;
      break;
      case 't':
      show_tree++;
      break;
      case 'i':
      pacc->id_file_name = optarg;
      break;
      case 'm':
      machine_readable++;
      break;
      case 'M':
      map_mode++;
      break;
      case 'X':
        xfree86configformat++;
        break;
      default:
      if (parse_generic_option(i, pacc, optarg))
        break;
      bad:
      fprintf(stderr, help_msg, pacc->id_file_name);
      return 1;
      }
  if (optind < argc)
    goto bad;

  pci_init(pacc);
  if (map_mode)
    map_the_bus();
  else
    {
      scan_devices();
      sort_them();
      if (show_tree)
      show_forest();
      else
      show();
    }
  pci_cleanup(pacc);

  return 0;
}

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