Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933330Ab2BAWqy (ORCPT ); Wed, 1 Feb 2012 17:46:54 -0500 Received: from acsinet15.oracle.com ([141.146.126.227]:33866 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757712Ab2BAWom (ORCPT ); Wed, 1 Feb 2012 17:44:42 -0500 From: Yinghai Lu To: Jesse Barnes , Benjamin Herrenschmidt , Tony Luck Cc: Bjorn Helgaas , Dominik Brodowski , Andrew Morton , Linus Torvalds , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Yinghai Lu Subject: [PATCH 09/15] PCI: Add pci_bus_extend/shrink_top() Date: Wed, 1 Feb 2012 14:43:56 -0800 Message-Id: <1328136242-17725-10-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1328136242-17725-1-git-send-email-yinghai@kernel.org> References: <1328136242-17725-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet21.oracle.com [141.146.126.237] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090207.4F29C04C.0043,ss=1,re=0.000,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2059 Lines: 74 extend or shrink bus and parent buses top (subordinate) extended range is verified safe range, and stop at recorded parent_res. Signed-off-by: Yinghai Lu --- drivers/pci/probe.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 79de0dd..91fdaec 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -624,6 +624,52 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) } } +static void __devinit pci_bus_extend_top(struct pci_bus *parent, + resource_size_t size, struct resource *parent_res) +{ + struct resource *res; + + if (!size) + return; + + while (parent) { + res = &parent->busn_res; + if (res == parent_res) + break; + res->end += size; + parent->subordinate += size; + pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, + parent->subordinate); + dev_printk(KERN_DEBUG, &parent->dev, + "busn_res: extended %02llx to %pR\n", + (unsigned long long)size, res); + parent = parent->parent; + } +} + +static void __devinit pci_bus_shrink_top(struct pci_bus *parent, + resource_size_t size, struct resource *parent_res) +{ + struct resource *res; + + if (!size) + return; + + while (parent) { + res = &parent->busn_res; + if (res == parent_res) + break; + res->end -= size; + parent->subordinate -= size; + pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, + parent->subordinate); + dev_printk(KERN_DEBUG, &parent->dev, + "busn_res: shrunk %02llx to %pR\n", + (unsigned long long)size, res); + parent = parent->parent; + } +} + /* * If it's a bridge, configure it and scan the bus behind it. * For CardBus bridges, we don't scan behind as the devices will -- 1.7.7 -- 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/