From patchwork Mon Apr 16 10:34:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 898561 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40PlBj0Mhtz9s1l for ; Mon, 16 Apr 2018 20:35:09 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752952AbeDPKfG (ORCPT ); Mon, 16 Apr 2018 06:35:06 -0400 Received: from mga18.intel.com ([134.134.136.126]:49740 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753233AbeDPKfC (ORCPT ); Mon, 16 Apr 2018 06:35:02 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Apr 2018 03:35:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,459,1517904000"; d="scan'208";a="216926282" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga005.jf.intel.com with ESMTP; 16 Apr 2018 03:34:58 -0700 Received: by black.fi.intel.com (Postfix, from userid 1001) id 0385F270; Mon, 16 Apr 2018 13:34:54 +0300 (EEST) From: Mika Westerberg To: Bjorn Helgaas , "Rafael J. Wysocki" Cc: Len Brown , Mario.Limonciello@dell.com, Michael Jamet , Yehezkel Bernat , Andy Shevchenko , Lukas Wunner , Mika Westerberg , linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH v5 6/9] PCI: Move resource distribution for a single bridge outside of the loop Date: Mon, 16 Apr 2018 13:34:50 +0300 Message-Id: <20180416103453.46232-7-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.16.3 In-Reply-To: <20180416103453.46232-1-mika.westerberg@linux.intel.com> References: <20180416103453.46232-1-mika.westerberg@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org There is a special case where there is only single bridge on the bus. In that case we just assign all resources to it. Currently this is done as a part of the resource distribution loop but it does not have to be there, and moving it outside actually improves readability. While there we can add hotplug_bridges == 1 && normal_bridges == 0 to the same block because they are dealt the same way. Suggested-by: Bjorn Helgaas Signed-off-by: Mika Westerberg Reviewed-by: Rafael J. Wysocki --- drivers/pci/setup-bus.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index eb3059fb7f63..a1b63c7745d0 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1947,6 +1947,22 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, mmio_start = mmio_res->start; mmio_pref_start = mmio_pref_res->start; + /* + * There is only one bridge on the bus so it gets all available + * resources which it can then distribute to the possible + * hotplug bridges below. + */ + if ((hotplug_bridges == 0 && normal_bridges == 1) || + (hotplug_bridges == 1 && normal_bridges == 0)) { + dev = list_first_entry(&bus->devices, struct pci_dev, bus_list); + if (dev->subordinate) { + pci_bus_distribute_available_resources(dev->subordinate, + add_list, available_io, available_mmio, + available_mmio_pref); + } + return; + } + /* * Go over devices on this bus and distribute the remaining * resource space between hotplug bridges. @@ -1959,17 +1975,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, if (!b) continue; - if (!hotplug_bridges && normal_bridges == 1) { - /* - * There is only one bridge on the bus (upstream - * port) so it gets all available resources - * which it can then distribute to the possible - * hotplug bridges below. - */ - pci_bus_distribute_available_resources(b, add_list, - available_io, available_mmio, - available_mmio_pref); - } else if (dev->is_hotplug_bridge) { + if (dev->is_hotplug_bridge) { resource_size_t io, mmio, mmio_pref; /*