This patch series[1] is a v2 of a previous version:
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
- Rebased against v4.11-rc4
v1: https://lkml.org/lkml/2017/2/27/228
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-v2
Cc: Pratyush Anand <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Mingkai Hu <[email protected]>
Cc: Tanmay Inamdar <[email protected]>
Cc: Murali Karicheri <[email protected]>
Cc: Russell King <[email protected]>
Cc: Bharat Kumar Gogada <[email protected]>
Cc: Ray Jui <[email protected]>
Cc: Wenrui Li <[email protected]>
Cc: Shawn Lin <[email protected]>
Cc: Minghuan Lian <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Jon Mason <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Gabriele Paoloni <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Cc: Joao Pinto <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Luis R. Rodriguez <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Cc: Stanimir Varbanov <[email protected]>
Cc: Zhou Wang <[email protected]>
Cc: Roy Zang <[email protected]>
Lorenzo Pieralisi (22):
PCI: remove __weak tag from pci_remap_iospace()
asm-generic/io.h: add ioremap_nopost remap interface
asm-generic/pgtable.h: introduce pgprot_nonposted remap attribute
PCI: fix pci_remap_iospace() remap attribute
ARM64: implement ioremap_nopost() interface
ARM: implement ioremap_nopost() interface
PCI: ECAM: use ioremap_nopost() to map config region
lib: implement Devres ioremap_nopost() interface
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: hisi: 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: 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 | 3 ++
arch/alpha/include/asm/io.h | 1 +
arch/arm/include/asm/io.h | 10 +++++
arch/arm/mm/ioremap.c | 7 +++
arch/arm/mm/nommu.c | 9 ++++
arch/arm64/include/asm/io.h | 12 ++++++
arch/avr32/include/asm/io.h | 1 +
arch/frv/include/asm/io.h | 1 +
arch/ia64/include/asm/io.h | 1 +
arch/x86/include/asm/io.h | 1 +
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 | 5 ++-
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 | 4 +-
include/asm-generic/io.h | 4 ++
include/asm-generic/pgtable.h | 4 ++
include/linux/device.h | 2 +
include/linux/io.h | 2 +
lib/devres.c | 78 ++++++++++++++++++++++++++++++++++
31 files changed, 166 insertions(+), 28 deletions(-)
--
2.10.0
