From 888ddf0e53f304d61326665bca3294f38129d7c9 Mon Sep 17 00:00:00 2001
From: Gera Kazakov <gera.kazakov@liqid.com>
Date: Tue, 18 Sep 2018 17:51:07 -0600
Subject: [PATCH] lspci: Allow -s with -t to show a subtree

---
 ls-tree.c | 19 +++++++++++++++++--
 lspci.c   |  5 +----
 lspci.h   |  2 +-
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/ls-tree.c b/ls-tree.c
index 8d60ea2..6995dd2 100644
--- a/ls-tree.c
+++ b/ls-tree.c
@@ -234,8 +234,23 @@ show_tree_bridge(struct bridge *b, char *line, char *p)
 }
 
 void
-show_forest(void)
+show_forest(struct pci_filter *filter)
 {
   char line[256];
-  show_tree_bridge(&host_bridge, line, line);
+  if (filter == NULL)
+    show_tree_bridge(&host_bridge, line, line);
+  else
+    {
+      struct bridge *b;
+      for (b=&host_bridge; b; b=b->chain)
+        {
+          if (b->br_dev && pci_filter_match(filter, b->br_dev->dev))
+            {
+                struct pci_dev *d = b->br_dev->dev;
+                char *p = line;
+                p += sprintf(line, "%04x:%02x:", d->domain_16, d->bus);
+                show_tree_dev(b->br_dev, line, p);
+            }
+        }
+    }
 }
diff --git a/lspci.c b/lspci.c
index 3dabbde..d63b6d0 100644
--- a/lspci.c
+++ b/lspci.c
@@ -1077,9 +1077,6 @@ main(int argc, char **argv)
   if (optind < argc)
     goto bad;
 
-  if (opt_tree && opt_filter)
-    die("Tree mode does not support filtering");
-
   if (opt_query_dns)
     {
       pacc->id_lookup_mode |= PCI_LOOKUP_NETWORK;
@@ -1103,7 +1100,7 @@ main(int argc, char **argv)
       if (need_topology)
 	grow_tree();
       if (opt_tree)
-	show_forest();
+	show_forest(opt_filter ? &filter : NULL);
       else
 	show();
     }
diff --git a/lspci.h b/lspci.h
index 9c12eb8..fefee52 100644
--- a/lspci.h
+++ b/lspci.h
@@ -107,7 +107,7 @@ struct bus {
 extern struct bridge host_bridge;
 
 void grow_tree(void);
-void show_forest(void);
+void show_forest(struct pci_filter *filter);
 
 /* ls-map.c */
 
-- 
2.39.2