Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756985AbcDHARH (ORCPT ); Thu, 7 Apr 2016 20:17:07 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:35058 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756861AbcDHARC (ORCPT ); Thu, 7 Apr 2016 20:17:02 -0400 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Linus Torvalds Cc: Wei Yang , TJ , Yijing Wang , Khalid Aziz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v11 13/60] PCI: Only treat non-pref mmio64 as pref if all bridges have MEM_64 Date: Thu, 7 Apr 2016 17:15:26 -0700 Message-Id: <1460074573-7481-14-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1460074573-7481-1-git-send-email-yinghai@kernel.org> References: <1460074573-7481-1-git-send-email-yinghai@kernel.org> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2389 Lines: 81 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; -- 1.8.4.5