Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753872AbbHUGYO (ORCPT ); Fri, 21 Aug 2015 02:24:14 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:25040 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753843AbbHUGYM (ORCPT ); Fri, 21 Aug 2015 02:24:12 -0400 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Wei Yang , TJ , Yijing Wang Cc: Andrew Morton , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v4 30/52] PCI: Allow bridge optional only io port resource required size to be 0 Date: Thu, 20 Aug 2015 23:20:45 -0700 Message-Id: <1440138067-4314-31-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1440138067-4314-1-git-send-email-yinghai@kernel.org> References: <1440138067-4314-1-git-send-email-yinghai@kernel.org> X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1744 Lines: 49 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 2d26745..7fb08ef 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1236,8 +1236,9 @@ 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) @@ -1253,7 +1254,7 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/