The "PCI Root Bridge ("pci_root")" driver includes support for attaching
sub-drivers. acpi_pci_register_driver() and acpi_pci_unregister_driver()
are the interfaces that sub-drivers use to attach themselves.
Currently there are only two callers of acpi_pci_register_driver(): the
"ACPI Hot Plug PCI Controller Driver ("acpiphp")" and "ACPI PCI Slot
Detection Driver ("pci_slot")" sub-drivers.
Sub-drivers may be compiled as modules. Kernel modules are instantiated
somewhat randomly - the order in which they are linked as the kernel as
built - thus if there are any dependencies on the ordering of attaching
sub-drivers, they can not be effectively dealt with.
This patch series resolves any potential sequencing inter-dependencies by
converting sub-driver functionality to being only supported as statically
built-in to the kernel as part of the "pci_root" driver itself (i.e. no
longer supported as a module). Inter-dependencies can then be effectively
handled by explicitly sequencing the addition of such functionality.
The series begins with a patch from Yinghai Lu's "PCI, ACPI, x86: pci root
bus hotplug support" series that separates host bridge specific hot-plug
functionality from PCI device hot-plug functionality. This patch
significantly simplifies a fairly confusing implementation due to the
co-mingling that currently exists.
Reference: https://lkml.org/lkml/2012/9/19/413
The rest of the patches in this series implement the conversion of the
"PCI Root Bridge" sub-drivers. This also simplifies the implementation as
is revealed by a 'diffstat' of the respective, conversion related,
patches: 9 files changed, 86 insertions(+), 237 deletions(-)
This series is targeting the 3.9 merge window. I expect that after
3.8-rc1 is released, a -v2 of this series will be required due to Bill
Pemberton's "[PATCH 000/493] remove CONFIG_HOTPLUG as an option" series.
That said, I wanted to go ahead and get this out now in order to solicit
feedback.
Reference: https://lkml.org/lkml/2012/11/16/660
---
Myron Stowe (14):
PCI/ACPI: Remove the "pci_root" driver's sub-driver infrastructure
PCI/ACPI: Add "pci_slot" functionality statically within "pci_root"
PCI/ACPI: Convert "pci_slot" sub-driver's functionality to built-in only
PCI/ACPI: Move where dmi_check_system() is called from
PCI/ACPI: Fix latent refcount issue in acpi_pci_root_start()
PCI/acpiphp: Change acpiphp_add_bridge() to return void instead of 0
PCI/acpiphp: Add "acpiphp" functionality statically within "pci_root"
PCI/acpiphp: Collapse the initialization call chain of "acpiphp" further
PCI/acpiphp: Declare acpi_{add,remove}_bridge() as external functions
PCI/acpiphp: Convert "acpiphp" sub-driver's functionality to built-in only
PCI/acpiphp: Collapse initialization call chain of "acpiphp" sub-driver
PCI/acpiphp: Change acpiphp_glue_init() to return void instead of 0
PCI/acpiphp: Leave the "acpiphp" sub-driver registered and in place
PCI/acpiphp: Fix coding style of external declarations in acpiphp.h
Yinghai Lu (1):
PCI, acpiphp: Separate out hot-add support of pci host bridge
drivers/acpi/Kconfig | 5 -
drivers/acpi/Makefile | 1
drivers/acpi/pci_root.c | 50 +-------
drivers/acpi/pci_root_hp.c | 228 ++++++++++++++++++++++++++++++++++++
drivers/acpi/pci_slot.c | 84 +++++--------
drivers/pci/hotplug/Kconfig | 5 -
drivers/pci/hotplug/acpiphp.h | 17 +--
drivers/pci/hotplug/acpiphp_core.c | 45 -------
drivers/pci/hotplug/acpiphp_glue.c | 115 +++---------------
include/linux/acpi.h | 9 -
include/linux/pci-acpi.h | 16 +++
11 files changed, 312 insertions(+), 263 deletions(-)
create mode 100644 drivers/acpi/pci_root_hp.c
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