From patchwork Sat Jun 18 02:24:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 637404 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 3rWh1562t1z9syB for ; Sat, 18 Jun 2016 12:30:17 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932430AbcFRCZ4 (ORCPT ); Fri, 17 Jun 2016 22:25:56 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:25999 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753572AbcFRCZl (ORCPT ); Fri, 17 Jun 2016 22:25:41 -0400 Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u5I2PQkr009457 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 18 Jun 2016 02:25:26 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0022.oracle.com (8.14.4/8.13.8) with ESMTP id u5I2PPwr025017 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 18 Jun 2016 02:25:26 GMT Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id u5I2PPRo000972; Sat, 18 Jun 2016 02:25:25 GMT Received: from userv0022.oracle.com (/10.132.126.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Jun 2016 19:25:25 -0700 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Linus Torvalds Cc: Wei Yang , Khalid Aziz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v13 13/16] PCI: Only treat non-pref mmio64 as pref if all bridges have MEM_64 Date: Fri, 17 Jun 2016 19:24:58 -0700 Message-Id: <20160618022501.15648-14-yinghai@kernel.org> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160618022501.15648-1-yinghai@kernel.org> References: <20160618022501.15648-1-yinghai@kernel.org> X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If any bridge up to root only have 32bit pref mmio, We don't need to treat device non-pref mmio64 as as pref mmio64. We need to move pci_bridge_check_ranges calling early. For parent bridges pref mmio BAR may not allocated by BIOS, res flags is still 0, we need to have it correct set before we check them for child device resources. -v2: check all bus resources instead of just res[15]. Signed-off-by: Yinghai Lu Tested-by: Khalid Aziz --- drivers/pci/setup-bus.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index b3b1565..ffb1941 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -738,6 +738,29 @@ int pci_claim_bridge_resource(struct pci_dev *bridge, int i) return -EINVAL; } +static bool pci_up_path_over_pref_mem64(struct pci_bus *bus) +{ + if (pci_is_root_bus(bus)) + return true; + + if (bus->self) { + int i; + bool found = false; + struct resource *res; + + pci_bus_for_each_resource(bus, res, i) + if (res->flags & IORESOURCE_MEM_64) { + found = true; + break; + } + + if (!found) + return false; + } + + return pci_up_path_over_pref_mem64(bus->parent); +} + int pci_resource_pref_compatible(const struct pci_dev *dev, struct resource *res) { @@ -746,7 +769,8 @@ int pci_resource_pref_compatible(const struct pci_dev *dev, if ((res->flags & IORESOURCE_MEM) && (res->flags & IORESOURCE_MEM_64) && - dev->on_all_pcie_path) + dev->on_all_pcie_path && + pci_up_path_over_pref_mem64(dev->bus)) return res->flags | IORESOURCE_PREFETCH; return res->flags; @@ -1239,6 +1263,10 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) struct resource *b_res; int ret; + if (!pci_is_root_bus(bus) && + (bus->self->class >> 8) == PCI_CLASS_BRIDGE_PCI) + pci_bridge_check_ranges(bus); + list_for_each_entry(dev, &bus->devices, bus_list) { struct pci_bus *b = dev->subordinate; if (!b) @@ -1266,7 +1294,6 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) break; case PCI_CLASS_BRIDGE_PCI: - pci_bridge_check_ranges(bus); if (bus->self->is_hotplug_bridge) { additional_io_size = pci_hotplug_io_size; additional_mem_size = pci_hotplug_mem_size;