From patchwork Wed Jul 25 01:49:57 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 173091 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 2D73A2C0087 for ; Wed, 25 Jul 2012 11:50:16 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753326Ab2GYBuP (ORCPT ); Tue, 24 Jul 2012 21:50:15 -0400 Received: from e1.ny.us.ibm.com ([32.97.182.141]:35465 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753967Ab2GYBuO (ORCPT ); Tue, 24 Jul 2012 21:50:14 -0400 Received: from /spool/local by e1.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 24 Jul 2012 21:50:13 -0400 Received: from d01dlp02.pok.ibm.com (9.56.224.85) by e1.ny.us.ibm.com (192.168.1.101) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Tue, 24 Jul 2012 21:50:11 -0400 Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 74C176E8036 for ; Tue, 24 Jul 2012 21:50:11 -0400 (EDT) Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q6P1oAet379426 for ; Tue, 24 Jul 2012 21:50:10 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q6P1o9wq015836 for ; Tue, 24 Jul 2012 22:50:10 -0300 Received: from shangw (shangw.cn.ibm.com [9.125.213.201]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with SMTP id q6P1o6jl015199; Tue, 24 Jul 2012 22:50:07 -0300 Received: by shangw (Postfix, from userid 1000) id 72022302DAC; Wed, 25 Jul 2012 09:50:05 +0800 (CST) From: Gavin Shan To: linux-pci@vger.kernel.org Cc: bhelgaas@google.com, benh@kernel.crashing.org, linuxram@us.ibm.com, Gavin Shan Subject: [PATCH 8/8] ppc/pnv: I/O and memory alignment for p2p bridges Date: Wed, 25 Jul 2012 09:49:57 +0800 Message-Id: <1343180997-9483-9-git-send-email-shangw@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1343180997-9483-1-git-send-email-shangw@linux.vnet.ibm.com> References: <1343180997-9483-1-git-send-email-shangw@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12072501-6078-0000-0000-00000D865458 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The patch implements ppc_md.pcibios_window_alignment for powernv platform so that the resource reassignment in PCI core will be done according to the I/O and memory alignment returned from powernv platform. The alignments returned from powernv platform is closely depending on the scheme for PE segmenting. Besides, the patch isn't useful for now, but the subsequent patches will be working based on it. Signed-off-by: Gavin Shan --- arch/powerpc/platforms/powernv/pci-ioda.c | 38 +++++++++++++++++++++++++++++ 1 files changed, 38 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index fbdd74d..159bce5 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -1139,6 +1139,43 @@ static void __devinit pnv_pci_ioda_fixup_phb(struct pci_controller *hose) } } +/* + * Returns the alignment for I/O or memory windows for p2p + * bridges. That actually depends on how PEs are segmented. + * For now, we return I/O or M32 segment size for PE sensitive + * p2p bridges. Otherwise, the default values (4KiB for I/O, + * 1MiB for memory) will be returned. + */ +static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus, + unsigned long type) +{ + struct pci_dev *dev = bus->self; + struct pci_controller *hose = pci_bus_to_host(bus); + struct pnv_phb *phb = hose->private_data; + + /* PCI root bus will be assigned with segment size */ + if (!dev) + goto out; + + /* + * If the parent bridge is PCI bridge, we will return + * the default values + */ + dev = dev->bus->self; + if (!dev) + goto out; + if (dev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) { + return 1; + } + +out: + /* We need support prefetchable memory window later */ + if (type & IORESOURCE_MEM) + return phb->ioda.m32_segsize; + + return phb->ioda.io_segsize; +} + /* Prevent enabling devices for which we couldn't properly * assign a PE */ @@ -1306,6 +1343,7 @@ void __init pnv_pci_init_ioda1_phb(struct device_node *np) */ ppc_md.pcibios_fixup_phb = pnv_pci_ioda_fixup_phb; ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook; + ppc_md.pcibios_window_alignment = pnv_pci_window_alignment; pci_add_flags(PCI_PROBE_ONLY | PCI_REASSIGN_ALL_RSRC); /* Reset IODA tables to a clean state */