From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id EAA531A0E6E for ; Mon, 7 Mar 2016 18:55:12 +1100 (AEDT) Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 7 Mar 2016 17:55:11 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 7E64B2CE805C for ; Mon, 7 Mar 2016 18:49:59 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u277nplq3801354 for ; Mon, 7 Mar 2016 18:49:59 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u277nPS8023326 for ; Mon, 7 Mar 2016 18:49:26 +1100 From: Yongji Xie To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org Cc: bhelgaas@google.com, corbet@lwn.net, aik@ozlabs.ru, alex.williamson@redhat.com, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, Yongji Xie Subject: [RFC PATCH v4 3/7] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set Date: Mon, 7 Mar 2016 15:48:34 +0800 Message-Id: <1457336918-3893-4-git-send-email-xyjxie@linux.vnet.ibm.com> In-Reply-To: <1457336918-3893-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1457336918-3893-1-git-send-email-xyjxie@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The resource_alignment will releases memory resources allocated by firmware so that kernel can reassign new resources later on. But this will cause the problem that no resources can be allocated by kernel if PCI_PROBE_ONLY was set, e.g. on pSeries platform because PCI_PROBE_ONLY force kernel to use firmware setup and not to reassign any resources. To solve this problem, this patch ignores resource_alignment if PCI_PROBE_ONLY was set. Signed-off-by: Yongji Xie --- Documentation/kernel-parameters.txt | 2 ++ drivers/pci/probe.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index d8b29ab..8028631 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2922,6 +2922,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. windows need to be expanded. noresize: Don't change the resources' sizes when reassigning alignment. + Note that this option will not work if + PCI_PROBE_ONLY is set. ecrc= Enable/disable PCIe ECRC (transaction layer end-to-end CRC checking). bios: Use BIOS/firmware settings. This is the diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 6d7ab9b..bc31cad 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1719,7 +1719,8 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) pci_fixup_device(pci_fixup_header, dev); /* moved out from quirk header fixup code */ - pci_reassigndev_resource_alignment(dev); + if (!pci_has_flag(PCI_PROBE_ONLY)) + pci_reassigndev_resource_alignment(dev); /* Clear the state_saved flag. */ dev->state_saved = false; -- 1.7.9.5