2 * The PCI Utilities -- Show Bus Tree
4 * Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
15 struct bridge *chain; /* Single-linked list of bridges */
16 struct bridge *next, *child; /* Tree of bridges */
17 struct bus *first_bus; /* List of buses connected to this bridge */
19 unsigned int primary, secondary, subordinate; /* Bus numbers */
20 struct device *br_dev;
27 struct device *first_dev, **last_dev;
30 static struct bridge host_bridge = { NULL, NULL, NULL, NULL, 0, ~0, 0, ~0, NULL };
33 find_bus(struct bridge *b, unsigned int domain, unsigned int n)
37 for (bus=b->first_bus; bus; bus=bus->sibling)
38 if (bus->domain == domain && bus->number == n)
44 new_bus(struct bridge *b, unsigned int domain, unsigned int n)
46 struct bus *bus = xmalloc(sizeof(struct bus));
49 bus->sibling = b->first_bus;
50 bus->first_dev = NULL;
51 bus->last_dev = &bus->first_dev;
57 insert_dev(struct device *d, struct bridge *b)
59 struct pci_dev *p = d->dev;
62 if (! (bus = find_bus(b, p->domain, p->bus)))
65 for (c=b->child; c; c=c->next)
66 if (c->domain == p->domain && c->secondary <= p->bus && p->bus <= c->subordinate)
71 bus = new_bus(b, p->domain, p->bus);
73 /* Simple insertion at the end _does_ guarantee the correct order as the
74 * original device list was sorted by (domain, bus, devfn) lexicographically
75 * and all devices on the new list have the same bus number.
78 bus->last_dev = &d->next;
85 struct device *d, *d2;
86 struct bridge **last_br, *b;
88 /* Build list of bridges */
90 last_br = &host_bridge.chain;
91 for (d=first_dev; d; d=d->next)
93 word class = d->dev->device_class;
94 byte ht = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f;
95 if (class == PCI_CLASS_BRIDGE_PCI &&
96 (ht == PCI_HEADER_TYPE_BRIDGE || ht == PCI_HEADER_TYPE_CARDBUS))
98 b = xmalloc(sizeof(struct bridge));
99 b->domain = d->dev->domain;
100 if (ht == PCI_HEADER_TYPE_BRIDGE)
102 b->primary = get_conf_byte(d, PCI_PRIMARY_BUS);
103 b->secondary = get_conf_byte(d, PCI_SECONDARY_BUS);
104 b->subordinate = get_conf_byte(d, PCI_SUBORDINATE_BUS);
108 b->primary = get_conf_byte(d, PCI_CB_PRIMARY_BUS);
109 b->secondary = get_conf_byte(d, PCI_CB_CARD_BUS);
110 b->subordinate = get_conf_byte(d, PCI_CB_SUBORDINATE_BUS);
114 b->next = b->child = NULL;
121 /* Create a bridge tree */
123 for (b=&host_bridge; b; b=b->chain)
125 struct bridge *c, *best;
127 for (c=&host_bridge; c; c=c->chain)
128 if (c != b && (c == &host_bridge || b->domain == c->domain) &&
129 b->primary >= c->secondary && b->primary <= c->subordinate &&
130 (!best || best->subordinate - best->primary > c->subordinate - c->primary))
134 b->next = best->child;
139 /* Insert secondary bus for each bridge */
141 for (b=&host_bridge; b; b=b->chain)
142 if (!find_bus(b, b->domain, b->secondary))
143 new_bus(b, b->domain, b->secondary);
145 /* Create bus structs and link devices */
147 for (d=first_dev; d;)
150 insert_dev(d, &host_bridge);
156 print_it(char *line, char *p)
161 for (p=line; *p; p++)
162 if (*p == '+' || *p == '|')
168 static void show_tree_bridge(struct bridge *, char *, char *);
171 show_tree_dev(struct device *d, char *line, char *p)
173 struct pci_dev *q = d->dev;
177 p += sprintf(p, "%02x.%x", q->dev, q->func);
178 for (b=&host_bridge; b; b=b->chain)
181 if (b->secondary == b->subordinate)
182 p += sprintf(p, "-[%02x]-", b->secondary);
184 p += sprintf(p, "-[%02x-%02x]-", b->secondary, b->subordinate);
185 show_tree_bridge(b, line, p);
189 p += sprintf(p, " %s",
190 pci_lookup_name(pacc, namebuf, sizeof(namebuf),
191 PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
192 q->vendor_id, q->device_id));
197 show_tree_bus(struct bus *b, char *line, char *p)
201 else if (!b->first_dev->next)
205 show_tree_dev(b->first_dev, line, p);
209 struct device *d = b->first_dev;
214 show_tree_dev(d, line, p+2);
219 show_tree_dev(d, line, p+2);
224 show_tree_bridge(struct bridge *b, char *line, char *p)
227 if (!b->first_bus->sibling)
229 if (b == &host_bridge)
230 p += sprintf(p, "[%04x:%02x]-", b->domain, b->first_bus->number);
231 show_tree_bus(b->first_bus, line, p);
235 struct bus *u = b->first_bus;
240 k = p + sprintf(p, "+-[%04x:%02x]-", u->domain, u->number);
241 show_tree_bus(u, line, k);
244 k = p + sprintf(p, "\\-[%04x:%02x]-", u->domain, u->number);
245 show_tree_bus(u, line, k);
255 show_tree_bridge(&host_bridge, line, line);