Re: [PATCH v12 00/12] Support for creating generic PCI host bridges from DT

[Liviu Dudau <liviu@dudau.co.uk>]

On Tue, Sep 23, 2014 at 03:54:35PM -0600, Bjorn Helgaas wrote:
> On Tue, Sep 23, 2014 at 08:01:02PM +0100, Liviu Dudau wrote:
> > This is my version 12 of the attempt at adding support for generic PCI host
> > bridge controllers that make use of device tree information to
> > configure themselves. It contains cleanups to address comments posted for v11.
> > 
> > Bjorn intends to pull this series into his tree and send it to linux-next if
> > no major issues arise.
> > 
> > 
> > Changes from v11:
> >  - fixed race condition in pci_register_io_range() and bug where the function
> >    would return with the io_range_lock held.
> >  - split patch 4/10 that fixes the convertion of IO ranges into resources into
> >    two patches. The new 4/12 just moves the function into drivers/of/address.c
> >    and 5/12 makes the functional changes.
> >  - Added Linus Walleij ACK on 5/12 for the arch/arm/mach-integrator/pci_v3.c
> >    part
> >  - Removed the old PCI domain number parser and allocator and split the code
> >    into two independent functions: 'int pci_get_new_domain_nr(void)' will
> >    always return a new domain number when called while 'of_get_pci_domain_nr()'
> >    will parse the DT and try to find a property of the given node called
> >    'linux,pci-domain'. The property value, if found, will be truncated to
> >    16-bit value and returned, or a negative value if an error occurs.
> >  - Made the io_base pointer parameter that gets passed to
> >    of_pci_get_host_bridge_resources() optional (thanks Robert Richter) and
> >    be explicit when detecting multiple IO ranges about the device used.
> >  - Fixed comments on commits to explain who uses pci_remap_iospace() as well
> >    as making clear that the value used inside the function is a virtual address
> >    and not a physical one. Also be explicit in the warning generated when
> >    architectures without memory mapped IO support make use of this function
> >  - Merged the arm64 patch into this series as Bjorn is going to pull it
> >    into his tree.
> > 
> > Changes from v10:
> >  - Addressed Lorenzo's comments wrt io_base not being initialised inside the
> >    function that is supposed to modify it and also updated the comments to
> >    explain the values returned by the function
> >  - Updated pci_domain_nr helper function to split the allocation of the domain
> >    number from the parsing of the device tree to find maximum defined domain
> >    value
> >  - Fixed up the commit author for commit 6/10
> > 
> > Changes from v9:
> >  - Moved the DT parsing and assigning of IRQ patch from this series into arm64
> >    specific patch. This keeps existing pcibios_add_device() unchanged and adds
> >    an arch-specific version that can later be expanded to cater for dma_ops.
> >  - Incorporated the fix for users of of_pci_range_to_resources() into the patch
> >    that changes the behaviour for easier bisection.
> >  - Added fixes for tegra and rcar host drivers in their usage of
> >    of_pci_range_to_resources()
> >  - Broke up of_create_pci_host_bridge() to remove the callback function. The
> >    function left has been renamed into of_pci_get_host_bridge_resources(). The
> >    added benefit of that is that the architectural hook for fixing up host bridge
> >    resources now dissappears.
> >  - Reshuffled the way pgprot_device gets introduced. It is now part of the patch
> >    that adds pci_remap_iospace() function. The arm64 specific override is moved
> >    into the arm64 patchset.
> >  - Added a patch to pci_scan_root_bus() to assign unassigned resources if PCI
> >    flags are not PCI_PROBE_ONLY
> > 
> > v11 thread here: https://lkml.org/lkml/2014/9/17/732
> > v10 thread here: https://lkml.org/lkml/2014/9/8/333
> > v9 thread here, with links to previous threads: https://lkml.org/lkml/2014/8/12/361
> > 
> > Best regards,
> > Liviu
> > 
> > Catalin Marinas (1):
> >   PCI: Introduce generic domain handling for PCI busses.
> > 
> > Liviu Dudau (11):
> >   Fix ioport_map() for !CONFIG_GENERIC_IOMAP cases.
> >   PCI: Introduce helper functions to deal with PCI I/O ranges.
> >   ARM: Define PCI_IOBASE as the base of virtual PCI IO space.
> >   PCI: OF: Move of_pci_range_to_resources() into address.c
> >   PCI: OF: Fix the conversion of IO ranges into IO resources.
> >   PCI: Create pci_host_bridge before its associated bus in pci_create_root_bus.
> >   PCI: OF: Introduce helper function for retrieving PCI domain numbers
> >   OF: PCI: Add support for parsing PCI host bridge resources from DT
> >   PCI: Assign unassigned bus resources in pci_scan_root_bus()
> >   PCI: Introduce pci_remap_iospace() for remapping PCI I/O bus resources into CPU space
> >   arm64: Add architectural support for PCIe
> > 
> >  arch/arm/include/asm/io.h         |   1 +
> >  arch/arm/mach-integrator/pci_v3.c |  23 +++---
> >  arch/arm64/Kconfig                |  22 +++++-
> >  arch/arm64/include/asm/Kbuild     |   1 +
> >  arch/arm64/include/asm/io.h       |   3 +-
> >  arch/arm64/include/asm/pci.h      |  37 +++++++++
> >  arch/arm64/include/asm/pgtable.h  |   2 +
> >  arch/arm64/kernel/Makefile        |   1 +
> >  arch/arm64/kernel/pci.c           |  70 +++++++++++++++++
> >  drivers/of/address.c              | 155 ++++++++++++++++++++++++++++++++++++++
> >  drivers/of/of_pci.c               | 140 ++++++++++++++++++++++++++++++++++
> >  drivers/pci/host/pci-tegra.c      |  10 ++-
> >  drivers/pci/host/pcie-rcar.c      |  21 ++++--
> >  drivers/pci/pci.c                 |  43 +++++++++++
> >  drivers/pci/probe.c               |  46 ++++++-----
> >  include/asm-generic/io.h          |   2 +-
> >  include/asm-generic/pgtable.h     |   4 +
> >  include/linux/of_address.h        |  22 +++---
> >  include/linux/of_pci.h            |  18 +++++
> >  include/linux/pci.h               |  27 +++++++
> >  20 files changed, 596 insertions(+), 52 deletions(-)
> >  create mode 100644 arch/arm64/include/asm/pci.h
> >  create mode 100644 arch/arm64/kernel/pci.c
> 
> Applied to pci/host-generic, headed for v3.18, thanks!

I really appreciate this, Bjorn, and many thanks!!!

While the next immediate target is converting pci-host-generic.c, pci-imx6.c
and probably pcie-designware.c to my series, I would like to ask you what
is your longer term plan. Now that I have got my head full of PCI code,
I have some ideas but feel that meeting with you and all those involved
in core PCI support would be a better venue than sending emails back and
forth. When is your next plan to attend a Linux conference?

Best regards,
Liviu

> 
> Bjorn
> --
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