2 * The PCI Utilities -- Show Bus Tree
4 * Copyright (c) 1997--2020 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
15 struct bridge host_bridge = { NULL, NULL, NULL, NULL, 0, ~0, 0, ~0, NULL };
18 find_bus(struct bridge *b, unsigned int domain, unsigned int n)
22 for (bus=b->first_bus; bus; bus=bus->sibling)
23 if (bus->domain == domain && bus->number == n)
29 new_bus(struct bridge *b, unsigned int domain, unsigned int n)
31 struct bus *bus = xmalloc(sizeof(struct bus));
34 bus->sibling = b->first_bus;
35 bus->first_dev = NULL;
36 bus->last_dev = &bus->first_dev;
37 bus->parent_bridge = b;
43 insert_dev(struct device *d, struct bridge *b)
45 struct pci_dev *p = d->dev;
48 if (! (bus = find_bus(b, p->domain, p->bus)))
51 for (c=b->child; c; c=c->next)
52 if (c->domain == (unsigned)p->domain && c->secondary <= p->bus && p->bus <= c->subordinate)
57 bus = new_bus(b, p->domain, p->bus);
59 /* Simple insertion at the end _does_ guarantee the correct order as the
60 * original device list was sorted by (domain, bus, devfn) lexicographically
61 * and all devices on the new list have the same bus number.
64 bus->last_dev = &d->bus_next;
73 struct bridge **last_br, *b;
75 /* Build list of bridges */
77 last_br = &host_bridge.chain;
78 for (d=first_dev; d; d=d->next)
80 struct pci_dev *dd = d->dev;
81 word class = dd->device_class;
82 byte ht = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f;
83 if ((class >> 8) == PCI_BASE_CLASS_BRIDGE &&
84 (ht == PCI_HEADER_TYPE_BRIDGE || ht == PCI_HEADER_TYPE_CARDBUS))
86 b = xmalloc(sizeof(struct bridge));
87 b->domain = dd->domain;
88 if (ht == PCI_HEADER_TYPE_BRIDGE)
90 b->primary = get_conf_byte(d, PCI_PRIMARY_BUS);
91 b->secondary = get_conf_byte(d, PCI_SECONDARY_BUS);
92 b->subordinate = get_conf_byte(d, PCI_SUBORDINATE_BUS);
96 b->primary = get_conf_byte(d, PCI_CB_PRIMARY_BUS);
97 b->secondary = get_conf_byte(d, PCI_CB_CARD_BUS);
98 b->subordinate = get_conf_byte(d, PCI_CB_SUBORDINATE_BUS);
102 b->next = b->child = NULL;
106 pacc->debug("Tree: bridge %04x:%02x:%02x.%d: %02x -> %02x-%02x\n",
107 dd->domain, dd->bus, dd->dev, dd->func,
108 b->primary, b->secondary, b->subordinate);
113 /* Create a bridge tree */
115 for (b=&host_bridge; b; b=b->chain)
117 struct bridge *c, *best;
119 for (c=&host_bridge; c; c=c->chain)
120 if (c != b && (c == &host_bridge || b->domain == c->domain) &&
121 b->primary >= c->secondary && b->primary <= c->subordinate &&
122 (!best || best->subordinate - best->primary > c->subordinate - c->primary))
126 b->next = best->child;
131 /* Insert secondary bus for each bridge */
133 for (b=&host_bridge; b; b=b->chain)
134 if (!find_bus(b, b->domain, b->secondary))
135 new_bus(b, b->domain, b->secondary);
137 /* Create bus structs and link devices */
139 for (d=first_dev; d; d=d->next)
140 insert_dev(d, &host_bridge);
144 print_it(char *line, char *p)
149 for (p=line; *p; p++)
150 if (*p == '+' || *p == '|')
156 static void show_tree_bridge(struct bridge *, char *, char *);
158 #define LINE_BUF_SIZE 1024
160 static char * FORMAT_CHECK(printf, 3, 4)
161 tree_printf(char *line, char *p, char *fmt, ...)
164 char *end = line + LINE_BUF_SIZE - 2;
170 int res = vsnprintf(p, end - p, fmt, args);
173 /* Ancient C libraries return -1 on overflow */
184 show_tree_dev(struct device *d, char *line, char *p)
186 struct pci_dev *q = d->dev;
190 p = tree_printf(line, p, "%02x.%x", q->dev, q->func);
191 for (b=&host_bridge; b; b=b->chain)
194 if (b->secondary == b->subordinate)
195 p = tree_printf(line, p, "-[%02x]-", b->secondary);
197 p = tree_printf(line, p, "-[%02x-%02x]-", b->secondary, b->subordinate);
198 show_tree_bridge(b, line, p);
202 p = tree_printf(line, p, " %s",
203 pci_lookup_name(pacc, namebuf, sizeof(namebuf),
204 PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
205 q->vendor_id, q->device_id));
210 show_tree_bus(struct bus *b, char *line, char *p)
214 else if (!b->first_dev->bus_next)
216 p = tree_printf(line, p, "--");
217 show_tree_dev(b->first_dev, line, p);
221 struct device *d = b->first_dev;
224 char *p2 = tree_printf(line, p, "+-");
225 show_tree_dev(d, line, p2);
228 p = tree_printf(line, p, "\\-");
229 show_tree_dev(d, line, p);
234 show_tree_bridge(struct bridge *b, char *line, char *p)
237 if (!b->first_bus->sibling)
239 if (b == &host_bridge)
240 p = tree_printf(line, p, "[%04x:%02x]-", b->domain, b->first_bus->number);
241 show_tree_bus(b->first_bus, line, p);
245 struct bus *u = b->first_bus;
250 k = tree_printf(line, p, "+-[%04x:%02x]-", u->domain, u->number);
251 show_tree_bus(u, line, k);
254 k = tree_printf(line, p, "\\-[%04x:%02x]-", u->domain, u->number);
255 show_tree_bus(u, line, k);
260 show_forest(struct pci_filter *filter)
262 char line[LINE_BUF_SIZE];
264 show_tree_bridge(&host_bridge, line, line);
268 for (b=&host_bridge; b; b=b->chain)
270 if (b->br_dev && pci_filter_match(filter, b->br_dev->dev))
272 struct pci_dev *d = b->br_dev->dev;
274 p = tree_printf(line, p, "%04x:%02x:", d->domain_16, d->bus);
275 show_tree_dev(b->br_dev, line, p);