From fa7e1c06475fefff1cb785ccc95369f383ba3e15 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Wed, 31 Jan 2018 05:04:41 +0000
Subject: [PATCH] add pci_is_root_bus()

---
 sys/dev/pci/drm/drm_drv.c   | 3 ++-
 sys/dev/pci/drm/drm_linux.h | 9 ++++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/sys/dev/pci/drm/drm_drv.c b/sys/dev/pci/drm/drm_drv.c
index 1cefbb8e5e8..9db6ba51ca0 100644
--- a/sys/dev/pci/drm/drm_drv.c
+++ b/sys/dev/pci/drm/drm_drv.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: drm_drv.c,v 1.156 2018/01/30 08:17:31 jsg Exp $ */
+/* $OpenBSD: drm_drv.c,v 1.157 2018/01/31 05:04:41 jsg Exp $ */
 /*-
  * Copyright 2007-2009 Owain G. Ainsworth <oga@openbsd.org>
  * Copyright © 2008 Intel Corporation
@@ -430,6 +430,7 @@ drm_attach(struct device *parent, struct device *self, void *aux)
 	dev->pdev->bus = &dev->pdev->_bus;
 	dev->pdev->bus->pc = da->pc;
 	dev->pdev->bus->number = bus;
+	dev->pdev->bus->bridgetag = da->bridgetag;
 	dev->pdev->devfn = PCI_DEVFN(slot, func);
 
 	dev->pc = da->pc;
diff --git a/sys/dev/pci/drm/drm_linux.h b/sys/dev/pci/drm/drm_linux.h
index 1c7fd9fb16e..f11ac61e7a7 100644
--- a/sys/dev/pci/drm/drm_linux.h
+++ b/sys/dev/pci/drm/drm_linux.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: drm_linux.h,v 1.81 2018/01/31 03:26:00 jsg Exp $	*/
+/*	$OpenBSD: drm_linux.h,v 1.82 2018/01/31 05:04:41 jsg Exp $	*/
 /*
  * Copyright (c) 2013, 2014, 2015 Mark Kettenis
  * Copyright (c) 2017 Martin Pieuchot
@@ -1434,6 +1434,7 @@ struct resource {
 struct pci_bus {
 	pci_chipset_tag_t pc;
 	unsigned char	number;
+	pcitag_t	*bridgetag;
 };
 
 struct pci_dev {
@@ -1576,6 +1577,12 @@ pci_pcie_cap(struct pci_dev *pdev)
 	return pos;
 }
 
+static inline bool
+pci_is_root_bus(struct pci_bus *pbus)
+{
+	return (pbus->bridgetag == NULL);
+}
+
 static inline int
 pcie_capability_read_dword(struct pci_dev *pdev, int off, u32 *val)
 {
-- 
2.20.1