[PATCH v6 00/30] Refine PCI scan interfaces and make generic pci host bridge

[Yijing Wang <wangyijing@huawei.com>]

v5->v6:
	Fix cross building errors found by kbuild test.
	Export busn_resource to Xen pcifront driver.
v4->v5:
	Fix some code style issues and rename some functions suggested by Bjorn.
	Fix some code flaw(Eg. call pci_bus_add_devices() before resources claim
	or lack the return checking).
v3->v4:
	Fix the rebase issue.
v2->v3:
	Rebase this series on v4.0-rc1.
v1->v2:
	Split pci_host_bridge_list into a new patch, remove .phb_probe_mode
	and rework powerpc .phb_of_scan_bus() for simpilicty suggested by
	Arnd. Refresh some patch description log, and add a new patch to fix
	build warning in ia64.

This series is based on Bjorn's pci-next branch.

Patch 1-4 ripped out pci_bus_add_devices() from pci scan interfaces
for better pci scan flow.

Patch 5-11 make a generic pci_host_bridge to hold pci_host_bridge
related informations, and introduce a pci_host_bridge_ops to 
support platform host drivers provide its own pci_host_bridge 
related operations to setup pci_host_bridge during pci enumeration.

Patch 12-28 apply the new pci scan interfaces to platform pci host
bridge drivers.

Now in kernel, we scan pci bus use the following ways:
1. pci_scan_bus. 
	parent = NULL, default io/mem/bus resources
	call pci_bus_add_devices()

2. pci_scan_bus_parented() + pci_bus_add_devices()
	default io/mem/bus resources, only used by xen

3. pci_scan_root_bus() + pci_bus_add_devices()

4. pci_create_root_bus() + pci_scan_child_bus() + pci_bus_add_devices()

5. pci_create_root_bus() + xx_of_scan_bus()  +  pci_bus_add_devices()

And we have a lot of arch specific pci_domain_nr() and other platform
specific weak function like pcibios_root_bridge_prepare().

After applied this series, we have following scan interfaces:

1. pci_scan_bus() 
	parent = NULL, default io/mem/bus resources.
	for legacy pci scan

2. pci_scan_root_bus()
	for callers provide its own parent and io/mem/bus resources
	but no platform specific pci_host_bridge operations

3. pci_scan_root_bridge()
	for callers provide its own parent and io/mem/bus resources


Arnd Bergmann (1):
  xen/PCI: Don't use deprecated function pci_scan_bus_parented()

Yijing Wang (29):
  PCI: Rip out pci_bus_add_devices() from pci_scan_bus()
  PCI: Rip out pci_bus_add_devices() from pci_scan_root_bus()
  PCI: Export busn_resource to drivers/pci
  PCI: Remove deprecated pci_scan_bus_parented()
  PCI: Combine PCI domain and bus number in u32 arg
  PCI: Pass PCI domain number combined with root bus number
  PCI: Introduce pci_host_assign_domain_nr() to assign domain
  PCI: Separate pci_host_bridge creation out of pci_create_root_bus()
  PCI: Introduce pci_host_bridge_list to manage host bridges
  PCI: Save sysdata in pci_host_bridge drvdata
  PCI: Introduce pci_host_bridge_ops to support host specific
    operations
  PCI: Introduce new scan function pci_scan_host_bridge()
  x86/PCI: Refine pci_acpi_scan_root() with generic pci_host_bridge
  ia64/PCI: Refine pci_acpi_scan_root() with generic pci_host_bridge
  powerpc/pci: Rename pcibios_root_bridge_prepare()
  powerpc/pci: Use pci_scan_host_bridge() for simplicity
  PCI: Remove weak pcibios_root_bridge_prepare()
  sparc/PCI: Claim bus resources before pci_bus_add_devices()
  sparc/PCI: Use pci_scan_host_bridge() for simplicity
  PCI: Introduce pci_bus_child_max_busnr()
  parisc/PCI: Use pci_scan_root_bus() for simplicity
  PCI/mvebu: Use pci_common_init_dev() to simplify code
  PCI/tegra: Remove redundant tegra_pcie_scan_bus()
  PCI/designware: Use pci_scan_root_bus() for simplicity
  PCI/xgene: Use pci_scan_root_bus() instead of pci_create_root_bus()
  PCI: Rename __pci_create_root_bus() to pci_create_root_bus()
  PCI: Export find_pci_host_bridge() and rename to
    pci_find_host_bridge()
  PCI: Remove platform specific pci_domain_nr()
  PCI: Remove pci_bus_assign_domain_nr()

 arch/alpha/include/asm/pci.h             |    2 -
 arch/alpha/kernel/pci.c                  |   14 ++-
 arch/alpha/kernel/sys_nautilus.c         |    6 +-
 arch/frv/mb93090-mb00/pci-vdk.c          |    6 +-
 arch/ia64/include/asm/pci.h              |    1 -
 arch/ia64/pci/pci.c                      |   34 +++---
 arch/ia64/sn/kernel/io_init.c            |    7 +-
 arch/m68k/coldfire/pci.c                 |    1 +
 arch/microblaze/pci/pci-common.c         |   19 +--
 arch/mips/include/asm/pci.h              |    2 -
 arch/mips/pci/pci.c                      |    5 +-
 arch/mn10300/unit-asb2305/pci.c          |    7 +-
 arch/powerpc/include/asm/machdep.h       |    2 +-
 arch/powerpc/kernel/pci-common.c         |   77 ++++++------
 arch/powerpc/platforms/pseries/pci.c     |    8 +-
 arch/powerpc/platforms/pseries/pseries.h |    2 +-
 arch/powerpc/platforms/pseries/setup.c   |    2 +-
 arch/s390/pci/pci.c                      |   13 +--
 arch/sh/drivers/pci/pci.c                |    6 +-
 arch/sh/include/asm/pci.h                |    2 -
 arch/sparc/kernel/leon_pci.c             |    1 +
 arch/sparc/kernel/pci.c                  |   51 ++++-----
 arch/sparc/kernel/pcic.c                 |    3 +
 arch/tile/include/asm/pci.h              |    2 -
 arch/tile/kernel/pci.c                   |    7 +-
 arch/tile/kernel/pci_gx.c                |    7 +-
 arch/unicore32/kernel/pci.c              |   11 +--
 arch/x86/include/asm/pci.h               |    6 -
 arch/x86/pci/acpi.c                      |   37 +++---
 arch/x86/pci/common.c                    |    4 +-
 arch/xtensa/kernel/pci.c                 |   11 ++-
 drivers/parisc/dino.c                    |    8 +-
 drivers/parisc/lba_pci.c                 |    7 +-
 drivers/pci/host-bridge.c                |   93 ++++++++++++++-
 drivers/pci/host/pci-mvebu.c             |   18 +---
 drivers/pci/host/pci-tegra.c             |   16 ---
 drivers/pci/host/pci-xgene.c             |    3 +-
 drivers/pci/host/pcie-designware.c       |    4 +-
 drivers/pci/hotplug/acpiphp_glue.c       |   29 +-----
 drivers/pci/hotplug/ibmphp_core.c        |    8 +-
 drivers/pci/pci.c                        |   50 +++++++-
 drivers/pci/pci.h                        |    9 ++
 drivers/pci/probe.c                      |  196 ++++++++++++------------------
 drivers/pci/xen-pcifront.c               |   13 ++-
 include/linux/pci.h                      |   42 ++++---
 include/uapi/linux/pci.h                 |    3 +
 46 files changed, 458 insertions(+), 397 deletions(-)