1 files changed, 468 insertions, 0 deletions

diff --git a/ls-tree.c b/ls-tree.c
new file mode 100644
index 0000000..5189930
--- /dev/null
+++ b/ls-tree.c
@@ -0,0 +1,468 @@
+/*
+ *	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 v2+.
+ *
+ *	SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "lspci.h"
+
+struct bridge host_bridge = { NULL, 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 && b == &host_bridge)
+    {
+      for (b=b->child; b; b=b->prev)
+        if (b->domain == (unsigned)p->domain)
+          break;
+      if (!b)
+        b = &host_bridge;
+    }
+
+  if (!bus && ! (bus = find_bus(b, p->domain, p->bus)))
+    {
+      struct bridge *c;
+      for (c=b->child; c; c=c->prev)
+	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;
+
+  last_br = &host_bridge.chain;
+
+  /* Build list of top level domain bridges */
+
+  for (d=first_dev; d; d=d->next)
+    {
+      for (b=host_bridge.chain; b; b=b->chain)
+        if (b->domain == (unsigned)d->dev->domain)
+          break;
+      if (b)
+        continue;
+      b = xmalloc(sizeof(struct bridge));
+      b->domain = d->dev->domain;
+      b->primary = ~0;
+      b->secondary = 0;
+      b->subordinate = ~0;
+      *last_br = b;
+      last_br = &b->chain;
+      b->prev = b->next = b->child = NULL;
+      b->first_bus = NULL;
+      b->last_bus = NULL;
+      b->br_dev = NULL;
+      b->chain = NULL;
+      pacc->debug("Tree: domain %04x\n", b->domain);
+    }
+
+  /* Build list of bridges */
+
+  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;
+	  b->primary = dd->bus;
+	  if (ht == PCI_HEADER_TYPE_BRIDGE)
+	    {
+	      b->secondary = get_conf_byte(d, PCI_SECONDARY_BUS);
+	      b->subordinate = get_conf_byte(d, PCI_SUBORDINATE_BUS);
+	    }
+	  else
+	    {
+	      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->prev = 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->prev = 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.chain; 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 == &host_bridge || best->subordinate - best->primary > c->subordinate - c->primary))
+	  best = c;
+      if (best)
+	{
+	  b->prev = best->child;
+	  best->child = b;
+	}
+    }
+
+  /* Insert secondary bus for each bridge */
+
+  for (b=host_bridge.chain; b; b=b->chain)
+    if (b->br_dev && !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.chain; 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 struct pci_filter *
+get_filter_for_child(struct pci_filter *filter, struct device *d)
+{
+  if (!filter)
+    return NULL;
+
+  if (pci_filter_match(filter, d->dev))
+    return NULL;
+
+  return filter;
+}
+
+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.chain; 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(get_filter_for_child(filter, b->first_dev), b->first_dev, line, p);
+        }
+      else
+        print_it(line, p);
+    }
+  else
+    {
+      int i, count = 0;
+      struct device *d = b->first_dev;
+
+      do
+        {
+          if (check_dev_filter(filter, d))
+            count++;
+          d = d->bus_next;
+        }
+      while (d);
+
+      for (i = 0, d = b->first_dev; d; d = d->bus_next)
+        {
+          if (!check_dev_filter(filter, d))
+            continue;
+          char *p2 = tree_printf(line, p, count == 1 ? "--" : count == i+1 ? "\\-" : "+-");
+          show_tree_dev(get_filter_for_child(filter, d), d, line, p2);
+          i++;
+        }
+
+      if (count == 0)
+        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->br_dev)
+            p = tree_printf(line, p, "[%04x:%02x]-", b->first_bus->domain, b->first_bus->number);
+          show_tree_bus(filter, b->first_bus, line, p);
+        }
+      else
+        print_it(line, p);
+    }
+  else
+    {
+      int i, count = 0;
+      struct bus *u = b->first_bus;
+      char *k;
+
+      do
+        {
+          if (check_bus_filter(filter, u))
+            count++;
+          u = u->sibling;
+        }
+      while (u);
+
+      for (i = 0, u = b->first_bus; u; u = u->sibling)
+        {
+          if (!check_bus_filter(filter, u))
+            continue;
+          k = tree_printf(line, p, count == 1 ? "[%04x:%02x]-" : count == i+1 ? "\\-[%04x:%02x]-" : "+-[%04x:%02x]-", u->domain, u->number);
+          show_tree_bus(filter, u, line, k);
+          i++;
+        }
+
+      if (count == 0)
+        print_it(line, p);
+    }
+}
+
+void
+show_forest(struct pci_filter *filter)
+{
+  char line[LINE_BUF_SIZE];
+  struct bridge *b;
+  if (host_bridge.child)
+    {
+      for (b=host_bridge.child; b->prev; b=b->prev)
+        b->prev->next = b;
+      for (; b; b=b->next)
+        show_tree_bridge(filter, b, line, line);
+    }
+}