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/*
* The PCI Utilities -- Bus Mapping Mode
*
* Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "lspci.h"
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 domain = (filter.domain >= 0 ? filter.domain : 0);
int dev, func;
int verbose = pacc->debugging;
struct bus_info *bi = bus_info + bus;
struct device *d;
if (verbose)
printf("Mapping bus %04x:%02x\n", domain, 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, domain, 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 %04x:%02x:%02x.%d\n", domain, 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');
}
}
}
void
map_the_bus(void)
{
if (pacc->method == PCI_ACCESS_PROC_BUS_PCI ||
pacc->method == PCI_ACCESS_SYS_BUS_PCI ||
pacc->method == PCI_ACCESS_WIN32_CFGMGR32 ||
pacc->method == PCI_ACCESS_DUMP)
printf("WARNING: Bus mapping can be reliable only with direct hardware access enabled.\n\n");
bus_info = xmalloc(sizeof(struct bus_info) * 256);
memset(bus_info, 0, 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();
}
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