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-rw-r--r--ls-tree.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/ls-tree.c b/ls-tree.c
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index 0000000..af1e659
--- /dev/null
+++ b/ls-tree.c
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+/*
+ * The PCI Utilities -- Show Bus Tree
+ *
+ * Copyright (c) 1997--2021 Martin Mares <mj@ucw.cz>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "lspci.h"
+
+struct bridge host_bridge = { NULL, NULL, NULL, NULL, NULL, 0, ~0, 0, ~0, NULL };
+
+static struct bus *
+find_bus(struct bridge *b, unsigned int domain, unsigned int n)
+{
+ struct bus *bus;
+
+ for (bus=b->first_bus; bus; bus=bus->sibling)
+ if (bus->domain == domain && bus->number == n)
+ break;
+ return bus;
+}
+
+static struct device *
+find_device(struct pci_dev *dd)
+{
+ struct device *d;
+
+ if (!dd)
+ return NULL;
+ for (d=first_dev; d; d=d->next)
+ if (d->dev == dd)
+ break;
+ return d;
+}
+
+static struct bus *
+new_bus(struct bridge *b, unsigned int domain, unsigned int n)
+{
+ struct bus *bus = xmalloc(sizeof(struct bus));
+ bus->domain = domain;
+ bus->number = n;
+ bus->sibling = NULL;
+ bus->first_dev = NULL;
+ bus->last_dev = &bus->first_dev;
+ bus->parent_bridge = b;
+ if (b->last_bus)
+ b->last_bus->sibling = bus;
+ b->last_bus = bus;
+ if (!b->first_bus)
+ b->first_bus = bus;
+ return bus;
+}
+
+static void
+insert_dev(struct device *d, struct bridge *b)
+{
+ struct pci_dev *p = d->dev;
+ struct device *parent = NULL;
+ struct bus *bus = NULL;
+
+ if (p->known_fields & PCI_FILL_PARENT)
+ parent = find_device(p->parent);
+
+ if (parent && parent->bridge)
+ {
+ bus = parent->bridge->first_bus;
+ if (!bus)
+ bus = new_bus(parent->bridge, p->domain, p->bus);
+ }
+
+ if (!bus && ! (bus = find_bus(b, p->domain, p->bus)))
+ {
+ struct bridge *c;
+ for (c=b->child; c; c=c->next)
+ if (c->domain == (unsigned)p->domain && c->secondary <= p->bus && p->bus <= c->subordinate)
+ {
+ insert_dev(d, c);
+ return;
+ }
+ bus = new_bus(b, p->domain, p->bus);
+ }
+ /* Simple insertion at the end _does_ guarantee the correct order as the
+ * original device list was sorted by (domain, bus, devfn) lexicographically
+ * and all devices on the new list have the same bus number.
+ */
+ *bus->last_dev = d;
+ bus->last_dev = &d->bus_next;
+ d->bus_next = NULL;
+ d->parent_bus = bus;
+}
+
+void
+grow_tree(void)
+{
+ struct device *d;
+ struct bridge **last_br, *b;
+
+ /* Build list of bridges */
+
+ last_br = &host_bridge.chain;
+ for (d=first_dev; d; d=d->next)
+ {
+ struct pci_dev *dd = d->dev;
+ word class = dd->device_class;
+ byte ht = d->no_config_access ? -1 : (get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f);
+ if ((class >> 8) == PCI_BASE_CLASS_BRIDGE &&
+ (ht == PCI_HEADER_TYPE_BRIDGE || ht == PCI_HEADER_TYPE_CARDBUS))
+ {
+ b = xmalloc(sizeof(struct bridge));
+ b->domain = dd->domain;
+ if (ht == PCI_HEADER_TYPE_BRIDGE)
+ {
+ 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);
+ }
+ else
+ {
+ 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);
+ }
+ *last_br = b;
+ last_br = &b->chain;
+ b->next = b->child = NULL;
+ b->first_bus = NULL;
+ b->last_bus = NULL;
+ b->br_dev = d;
+ d->bridge = b;
+ pacc->debug("Tree: bridge %04x:%02x:%02x.%d: %02x -> %02x-%02x\n",
+ dd->domain, dd->bus, dd->dev, dd->func,
+ b->primary, b->secondary, b->subordinate);
+ }
+ }
+
+ /* Append additional bridges reported by libpci via d->parent */
+
+ for (d=first_dev; d; d=d->next)
+ {
+ struct device *parent = NULL;
+ if (d->dev->known_fields & PCI_FILL_PARENT)
+ parent = find_device(d->dev->parent);
+ if (!parent || parent->bridge)
+ continue;
+ b = xmalloc(sizeof(struct bridge));
+ b->domain = parent->dev->domain;
+ b->primary = parent->dev->bus;
+ b->secondary = d->dev->bus;
+ /* At this stage subordinate number is unknown, so set it to secondary bus number. */
+ b->subordinate = b->secondary;
+ *last_br = b;
+ last_br = &b->chain;
+ b->next = b->child = NULL;
+ b->first_bus = NULL;
+ b->last_bus = NULL;
+ b->br_dev = parent;
+ parent->bridge = b;
+ pacc->debug("Tree: bridge %04x:%02x:%02x.%d\n", b->domain,
+ parent->dev->bus, parent->dev->dev, parent->dev->func);
+ }
+ *last_br = NULL;
+
+ /* Create a bridge tree */
+
+ for (b=&host_bridge; b; b=b->chain)
+ {
+ struct device *br_dev = b->br_dev;
+ struct bridge *c, *best = NULL;
+ struct device *parent = NULL;
+
+ if (br_dev && (br_dev->dev->known_fields & PCI_FILL_PARENT))
+ parent = find_device(br_dev->dev->parent);
+ if (parent)
+ best = parent->bridge;
+ if (!best)
+ for (c=&host_bridge; c; c=c->chain)
+ if (c != b && (c == &host_bridge || b->domain == c->domain) &&
+ 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->domain, b->secondary))
+ new_bus(b, b->domain, b->secondary);
+
+ /* Create bus structs and link devices */
+
+ for (d=first_dev; d; d=d->next)
+ insert_dev(d, &host_bridge);
+}
+
+#define LINE_BUF_SIZE 1024
+
+static void
+print_it(char *line, char *p)
+{
+ *p = 0;
+ fputs(line, stdout);
+ if (p >= line + LINE_BUF_SIZE - 1)
+ fputs("...", stdout);
+ putchar('\n');
+ for (p=line; *p; p++)
+ if (*p == '+' || *p == '|')
+ *p = '|';
+ else
+ *p = ' ';
+}
+
+static void show_tree_bridge(struct pci_filter *filter, struct bridge *, char *, char *);
+
+static char * FORMAT_CHECK(printf, 3, 4)
+tree_printf(char *line, char *p, char *fmt, ...)
+{
+ va_list args;
+ int space = line + LINE_BUF_SIZE - 1 - p;
+
+ if (space <= 0)
+ return p;
+
+ va_start(args, fmt);
+ int res = vsnprintf(p, space, fmt, args);
+ if (res < 0)
+ {
+ /* Ancient C libraries return -1 on overflow and they do not truncate the output properly. */
+ *p = 0;
+ p += space;
+ }
+ else if (res >= space)
+ {
+ /* Ancient C libraries do not truncate the output properly. */
+ *(p+space-1) = 0;
+ p += space;
+ }
+ else
+ p += res;
+
+ va_end(args);
+ return p;
+}
+
+static void
+show_tree_dev(struct pci_filter *filter, struct device *d, char *line, char *p)
+{
+ struct pci_dev *q = d->dev;
+ struct bridge *b;
+ char namebuf[256];
+
+ p = tree_printf(line, p, "%02x.%x", q->dev, q->func);
+ for (b=&host_bridge; b; b=b->chain)
+ if (b->br_dev == d)
+ {
+ if (b->secondary == 0)
+ p = tree_printf(line, p, "-");
+ else if (b->secondary == b->subordinate)
+ p = tree_printf(line, p, "-[%02x]-", b->secondary);
+ else
+ p = tree_printf(line, p, "-[%02x-%02x]-", b->secondary, b->subordinate);
+ show_tree_bridge(filter, b, line, p);
+ return;
+ }
+ if (verbose)
+ p = tree_printf(line, p, " %s",
+ pci_lookup_name(pacc, namebuf, sizeof(namebuf),
+ PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE,
+ q->vendor_id, q->device_id));
+ print_it(line, p);
+}
+
+static int
+check_bus_filter(struct pci_filter *filter, struct bus *b);
+
+static int
+check_dev_filter(struct pci_filter *filter, struct device *d)
+{
+ struct bridge *br;
+ struct bus *b;
+
+ if (!filter)
+ return 1;
+
+ if (pci_filter_match(filter, d->dev))
+ return 1;
+
+ for (br = &host_bridge; br; br = br->chain)
+ if (br->br_dev == d)
+ {
+ for (b = br->first_bus; b; b = b->sibling)
+ if (check_bus_filter(filter, b))
+ return 1;
+ break;
+ }
+
+ return 0;
+}
+
+static int
+check_bus_filter(struct pci_filter *filter, struct bus *b)
+{
+ struct device *d;
+
+ if (!filter)
+ return 1;
+
+ for (d = b->first_dev; d; d = d->bus_next)
+ if (check_dev_filter(filter, d))
+ return 1;
+
+ return 0;
+}
+
+static void
+show_tree_bus(struct pci_filter *filter, struct bus *b, char *line, char *p)
+{
+ if (!b->first_dev)
+ print_it(line, p);
+ else if (!b->first_dev->bus_next)
+ {
+ if (check_dev_filter(filter, b->first_dev))
+ {
+ p = tree_printf(line, p, "--");
+ show_tree_dev(filter, b->first_dev, line, p);
+ }
+ else
+ print_it(line, p);
+ }
+ else
+ {
+ int empty = 1;
+ struct device *d = b->first_dev;
+ while (d->bus_next)
+ {
+ if (check_dev_filter(filter, d))
+ {
+ char *p2 = tree_printf(line, p, "+-");
+ show_tree_dev(filter, d, line, p2);
+ empty = 0;
+ }
+ d = d->bus_next;
+ }
+ if (check_dev_filter(filter, d))
+ {
+ p = tree_printf(line, p, "\\-");
+ show_tree_dev(filter, d, line, p);
+ empty = 0;
+ }
+ if (empty)
+ print_it(line, p);
+ }
+}
+
+static void
+show_tree_bridge(struct pci_filter *filter, struct bridge *b, char *line, char *p)
+{
+ *p++ = '-';
+ if (!b->first_bus->sibling)
+ {
+ if (check_bus_filter(filter, b->first_bus))
+ {
+ if (b == &host_bridge)
+ p = tree_printf(line, p, "[%04x:%02x]-", b->domain, b->first_bus->number);
+ show_tree_bus(filter, b->first_bus, line, p);
+ }
+ else
+ print_it(line, p);
+ }
+ else
+ {
+ int empty = 1;
+ struct bus *u = b->first_bus;
+ char *k;
+
+ while (u->sibling)
+ {
+ if (check_bus_filter(filter, u))
+ {
+ k = tree_printf(line, p, "+-[%04x:%02x]-", u->domain, u->number);
+ show_tree_bus(filter, u, line, k);
+ empty = 0;
+ }
+ u = u->sibling;
+ }
+ if (check_bus_filter(filter, u))
+ {
+ k = tree_printf(line, p, "\\-[%04x:%02x]-", u->domain, u->number);
+ show_tree_bus(filter, u, line, k);
+ empty = 0;
+ }
+ if (empty)
+ print_it(line, p);
+ }
+}
+
+void
+show_forest(struct pci_filter *filter)
+{
+ char line[LINE_BUF_SIZE];
+ show_tree_bridge(filter, &host_bridge, line, line);
+}