Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757610AbcDHATb (ORCPT ); Thu, 7 Apr 2016 20:19:31 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:42806 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757187AbcDHATS (ORCPT ); Thu, 7 Apr 2016 20:19:18 -0400 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Linus Torvalds Cc: Wei Yang , TJ , Yijing Wang , Khalid Aziz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v11 51/60] PCI: Allow bridge optional only io port resource required size to be 0 Date: Thu, 7 Apr 2016 17:16:04 -0700 Message-Id: <1460074573-7481-52-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1460074573-7481-1-git-send-email-yinghai@kernel.org> References: <1460074573-7481-1-git-send-email-yinghai@kernel.org> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1498 Lines: 42 When there is no child device under the non hotplug bridge, We can use 0 for required size, and do not use old size as required size. That will save some io port range for other bridges, as BIOS could do some partial assign, and we want to use those not used io port range. When there is child device, size will not be 0. when the bridge supports hotplug, min_size will not be 0. So they will still honor the old size as required size. Signed-off-by: Yinghai Lu --- drivers/pci/setup-bus.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index b071035..28dfd8e 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1229,8 +1229,9 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, size = size_aligned_for_isa(size); size += size1; - size0 = calculate_size(size, min_size, - resource_size(b_res), min_align); + if (size || min_size) + size0 = calculate_size(size, min_size, + resource_size(b_res), min_align); sum_add_size = size_aligned_for_isa(sum_add_size); sum_add_size += sum_add_size1; if (sum_add_size < min_sum_size) @@ -1246,7 +1247,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, return; } - b_res->start = min_align; + b_res->start = size0 ? min_align : 0; b_res->end = b_res->start + size0 - 1; b_res->flags |= IORESOURCE_STARTALIGN; if (size1 > size0 && realloc_head) { -- 1.8.4.5