From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938480AbdDSQ4v (ORCPT ); Wed, 19 Apr 2017 12:56:51 -0400 Received: from foss.arm.com ([217.140.101.70]:43922 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S938263AbdDSQs4 (ORCPT ); Wed, 19 Apr 2017 12:48:56 -0400 From: Lorenzo Pieralisi To: linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi , Pratyush Anand , Arnd Bergmann , Jonathan Corbet , Will Deacon , Jingoo Han , Bjorn Helgaas , Mingkai Hu , Tanmay Inamdar , Murali Karicheri , Russell King , Bharat Kumar Gogada , Ray Jui , Wenrui Li , Shawn Lin , Minghuan Lian , Catalin Marinas , Jon Mason , Gabriele Paoloni , Thomas Petazzoni , Joao Pinto , Thierry Reding , "Luis R . Rodriguez" , Michal Simek , Stanimir Varbanov , Zhou Wang , Roy Zang , Benjamin Herrenschmidt , John Garry Subject: [PATCH v4 00/21] PCI: fix config space memory mappings Date: Wed, 19 Apr 2017 17:48:49 +0100 Message-Id: <20170419164913.19674-1-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series[1] is a v4 of a previous version: v3 -> v4: - Reverted back to pci_remap_cfgspace() interface for lack of consensus on ioremap_nopost() semantics - Dropped pci_remap_iospace() rework (owing to lack of adequate pgprot_* attribute description across arches) - Updated pci_remap_cfgspace() comments v3: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-April/500838.html v2 -> v3: - Created a default ioremap_nopost() implementation in a separate asm-generic header and patched all arches to make use of it - Removed PCI drivers patches from the series to simplify the review, they will be posted separately once the ioremap_nopost() interface is settled - Fixed devm_ioremap_* BUS offset comments and implemented nopost interface on top of it - Added collected tags v2: https://lkml.org/lkml/2017/3/27/220 v2 -> v3: - Fixed devm_ioremap_* BUS offset comments and implemented nopost interface on top of it - Added collected tags v1: https://lkml.org/lkml/2017/2/27/228 v1 -> v2: - Changed pci_remap_cfgspace() to more generic ioremap_nopost() interface - Added pgprot_nonposted - Fixed build errors on arches not relying on asm-generic headers - Added PCI versatile host controller driver patch - Added missing config space remapping to hisilicon host controller PCI local bus specifications (Rev3.0, 3.2.5 "Transaction Ordering and Posting") strictly require PCI configuration and I/O Address space write transactions to be non-posted. Current crop of DT/ACPI PCI host controllers drivers relies on the ioremap interface to map ECAM and ECAM-derivative PCI config regions and pci_remap_iospace() to create a VMA for mapping PCI host bridge I/O Address space transactions to CPU virtual address space. On some platforms (ie ARM/ARM64) ioremap fails to comply with the PCI configuration non-posted write transactions requirement, because it provides a memory mapping that issues "bufferable" or, in PCI terms "posted" write transactions. Likewise, the current pci_remap_iospace() implementation maps the physical address range that the PCI translates to I/O space cycles to virtual address space through pgprot_device() attributes that on eg ARM64 provides a memory mapping issuing posted writes transactions, which is not PCI specifications compliant. This patch series[1] addresses both issues in one go: - It updates the pci_remap_iospace() function to use a page mapping that guarantees non-posted write transactions for I/O space addresses - It adds a kernel API to remap PCI config space resources, so that architecture can override it with a mapping implementation that guarantees PCI specifications compliancy wrt non-posted write configuration transactions - It updates all PCI host controller implementations (and the generic ECAM layer) to use the newly introduced mapping interface Tested on Juno ECAM based interface (DT/ACPI). Non-ECAM PCI host controller drivers patches need checking to make sure that: - I patched the correct resource region mapping for config space - There are not any other ways to ensure posted-write completion in the respective pci_ops that make the relevant patch unnecessary [1] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git pci/config-io-mappings-fix-v4 Cc: Pratyush Anand Cc: Arnd Bergmann Cc: Jonathan Corbet Cc: Will Deacon Cc: Jingoo Han Cc: Bjorn Helgaas Cc: Mingkai Hu Cc: Tanmay Inamdar Cc: Murali Karicheri Cc: Russell King Cc: Bharat Kumar Gogada Cc: Ray Jui Cc: Wenrui Li Cc: Shawn Lin Cc: Minghuan Lian Cc: Catalin Marinas Cc: Jon Mason Cc: Gabriele Paoloni Cc: Thomas Petazzoni Cc: Joao Pinto Cc: Thierry Reding Cc: Luis R. Rodriguez Cc: Michal Simek Cc: Stanimir Varbanov Cc: Zhou Wang Cc: Roy Zang Lorenzo Pieralisi (21): PCI: remove __weak tag from pci_remap_iospace() linux/io.h: add PCI config space remap interface ARM64: implement pci_remap_cfgspace() interface ARM: implement pci_remap_cfgspace() interface lib: fix Devres devm_ioremap_* offset parameter kerneldoc description PCI: implement Devres interface to map PCI config space PCI: ECAM: use pci_remap_cfgspace() to map config region PCI: xilinx: update PCI config space remap function PCI: xilinx-nwl: update PCI config space remap function PCI: spear13xx: update PCI config space remap function PCI: rockchip: update PCI config space remap function PCI: qcom: update PCI config space remap function PCI: iproc-platform: update PCI config space remap function PCI: designware: update PCI config space remap function PCI: armada8k: update PCI config space remap function PCI: xgene: update PCI config space remap function PCI: tegra: update PCI config space remap function PCI: hisi: update PCI config space remap function PCI: layerscape: update PCI config space remap function PCI: keystone-dw: update PCI config space remap function PCI: versatile: update PCI config space remap function Documentation/driver-model/devres.txt | 6 ++- arch/arm/include/asm/io.h | 10 ++++ arch/arm/mm/ioremap.c | 7 +++ arch/arm/mm/nommu.c | 12 +++++ arch/arm64/include/asm/io.h | 10 ++++ drivers/pci/dwc/pci-keystone-dw.c | 2 +- drivers/pci/dwc/pci-layerscape.c | 2 +- drivers/pci/dwc/pcie-armada8k.c | 2 +- drivers/pci/dwc/pcie-designware-host.c | 12 +++-- drivers/pci/dwc/pcie-hisi.c | 7 ++- drivers/pci/dwc/pcie-qcom.c | 2 +- drivers/pci/dwc/pcie-spear13xx.c | 2 +- drivers/pci/ecam.c | 6 ++- drivers/pci/host/pci-tegra.c | 4 +- drivers/pci/host/pci-versatile.c | 3 +- drivers/pci/host/pci-xgene.c | 4 +- drivers/pci/host/pcie-iproc-platform.c | 3 +- drivers/pci/host/pcie-rockchip.c | 2 +- drivers/pci/host/pcie-xilinx-nwl.c | 2 +- drivers/pci/host/pcie-xilinx.c | 2 +- drivers/pci/pci.c | 84 +++++++++++++++++++++++++++++++++- include/linux/io.h | 19 ++++++++ include/linux/pci.h | 5 ++ lib/devres.c | 6 +-- 24 files changed, 183 insertions(+), 31 deletions(-) -- 2.10.0