From patchwork Mon Jan 12 19:23:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 428096 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 009041401F0 for ; Tue, 13 Jan 2015 06:27:11 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754621AbbALT0x (ORCPT ); Mon, 12 Jan 2015 14:26:53 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:48895 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757103AbbALT0C (ORCPT ); Mon, 12 Jan 2015 14:26:02 -0500 Received: from ucsinet22.oracle.com (ucsinet22.oracle.com [156.151.31.94]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t0CJP2vI013537 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 12 Jan 2015 19:25:03 GMT Received: from userz7021.oracle.com (userz7021.oracle.com [156.151.31.85]) by ucsinet22.oracle.com (8.14.5+Sun/8.14.5) with ESMTP id t0CJOxCX007915 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 12 Jan 2015 19:25:00 GMT Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userz7021.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id t0CJOw17027691; Mon, 12 Jan 2015 19:24:58 GMT Received: from linux-siqj.site (/10.132.126.81) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 12 Jan 2015 11:24:57 -0800 From: Yinghai Lu To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Gavin Shan , Anton Blanchard , Sebastian Ott , Wei Yang , Andrew Murray , linuxppc-dev@lists.ozlabs.org Subject: [PATCH 09/10] PCI, powerpc: clip firmware assigned resource under parent bridge's Date: Mon, 12 Jan 2015 11:23:19 -0800 Message-Id: <1421090600-9750-10-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1421090600-9750-1-git-send-email-yinghai@kernel.org> References: <1421090600-9750-1-git-send-email-yinghai@kernel.org> X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Some bios put range that is not fully coverred by root bus resources. Try to clip them and update them in pci bridge bars. We'd like to fix other arches instead of just x86. Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491 Reported-by: Marek Kordik Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources") Signed-off-by: Yinghai Lu Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Gavin Shan Cc: Anton Blanchard Cc: Sebastian Ott Cc: Wei Yang Cc: Andrew Murray Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/kernel/pci-common.c | 43 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 37d512d..6909546 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -1148,6 +1148,7 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus) struct pci_bus *b; int i; struct resource *res, *pr; + bool changed = false; pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", pci_domain_nr(bus), bus->number); @@ -1184,6 +1185,8 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus) pr, (pr && pr->name) ? pr->name : "nil"); if (pr && !(pr->flags & IORESOURCE_UNSET)) { + struct pci_dev *dev = bus->self; + if (request_resource(pr, res) == 0) continue; /* @@ -1193,6 +1196,16 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus) */ if (reparent_resources(pr, res) == 0) continue; + + if (dev && i >= PCI_BRIDGE_RESOURCES && + i < PCI_NUM_RESOURCES && + (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + pci_bus_clip_resource(dev, res)) { + changed = true; + if (pci_claim_resource(dev, i) >= 0) + continue; + } + } pr_warning("PCI: Cannot allocate resource region " "%d of PCI bridge %d, will remap\n", i, bus->number); @@ -1208,6 +1221,9 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus) res->flags = 0; } + if (changed) + pci_setup_bridge(bus); + list_for_each_entry(b, &bus->children, node) pcibios_allocate_bus_resources(b); } @@ -1225,6 +1241,13 @@ static inline void alloc_resource(struct pci_dev *dev, int idx) pr = pci_find_parent_resource(dev, r); if (!pr || (pr->flags & IORESOURCE_UNSET) || request_resource(pr, r) < 0) { + /* try again with clip */ + if (idx != PCI_ROM_RESOURCE && pci_bus_clip_resource(dev, r)) { + pci_update_resource(dev, idx); + if (pci_claim_resource(dev, idx) >= 0) + return; + } + printk(KERN_WARNING "PCI: Cannot allocate resource region %d" " of device %s, will remap\n", idx, pci_name(dev)); if (pr) @@ -1386,6 +1409,7 @@ void pcibios_claim_one_bus(struct pci_bus *bus) struct pci_bus *child_bus; list_for_each_entry(dev, &bus->devices, bus_list) { + bool changed = false; int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { @@ -1401,8 +1425,25 @@ void pcibios_claim_one_bus(struct pci_bus *bus) (unsigned long long)r->end, (unsigned int)r->flags); - pci_claim_resource(dev, i); + if (pci_claim_resource(dev, i) >= 0) + continue; + + if (dev->subordinate && + i >= PCI_BRIDGE_RESOURCES && + i < PCI_NUM_RESOURCES && + (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + pci_bus_clip_resource(dev, r)) { + changed = true; + pci_claim_resource(dev, i); + } else if (i < PCI_BRIDGE_RESOURCES && + i != PCI_ROM_RESOURCE && + pci_bus_clip_resource(dev, r)) { + pci_update_resource(dev, i); + pci_claim_resource(dev, i); + } } + if (changed) + pci_setup_bridge(dev->subordinate); } list_for_each_entry(child_bus, &bus->children, node)