Re: [Qemu-devel] [PATCH v6 0/9] Refactor PCI/SHPC/PCIE hotplug to use a more generic hotplug API

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Feb 05, 2014 at 04:36:43PM +0100, Igor Mammedov wrote:
> changes since v5:
>  - fixed typos Eric pointed to
>  - fix conflict of [5/9] with new patch "acpi-build: append description for non-hotplug"
>  - rebased on top of todays PCI tree
> 
> changes since v4:
>  - rebased on top of PCI tree
>  - added wrapper to set hotplug-device property
> 
> changes since v3:
>  - fixup/add comments as reqused by  Peter Crosthwaite
>  - use error_abort to reduce error handling verbosity
>  - fix tests/test-qdev-global-props build failure on make check
>  - rebase on top of current master:133fe7743 (with interface fixes)
> 
> changes since v2:
> * s/hotplugable/hotpluggable/
> * move hotplug check to an earlier patch:
>   "qdev: add "hotpluggable" property to Device"

This was on top my
    acpi-build: append description for non-hotplug
which I'm not merging yet, so I had to rebase.

Applied and pushed, please verify and confirm.

> --
> Refactor PCI specific hotplug API to a more generic/reusable one.
> Model it after SCSI-BUS like hotplug API replacing single hotplug
> callback with hotplug/hot_unplug pair of callbacks as suggested by
> Paolo.
> Difference between SCSI-BUS and this approach is that the former
> is BUS centric while the latter is device centred. Which is evolved
> from the fact that hotplug callbacks used by ACPI/SHPC/PCIE are
> implemented by devices rather than by bus and bus serves only as
> a proxy to forward event to hotplug device.
> Memory hotplug also exposes tha same usage pattern hence an attempt
> to generalize hotplug API.
> 
> Refactoring also simplifies wiring of a hotplug device with a bus,
> all it needs is to set "hotplug-device" link on bus, which
> would potentially allow to do it from configuration file,
> there is not need to setup hotplug device callbacks on bus
> synce it can get them via HOTPLUG_DEVICE API of "hotplug-device"
> target.
> 
> In addition device centred hotplug API may be used by bus-less
> hotplug implementations as well if it's decided to use
> link<foo...> instead of bus.
> 
> Patches 8-11 are should be merged as one and are split only for
> simplifying review (they compile fine but PCI hotplug is broken
> until the last patch is applyed).
> 
> git tree for testing:
> https://github.com/imammedo/qemu/commits/hotplug_dev_inf_v6
> 
> tested only ACPI and PCIE hotplug, since SHPC is not functional, tested
> it under debugger that hotplhug event reaches handler and corresponding interrupt is emited.
> 
> 
> Igor Mammedov (9):
>   define hotplug interface
>   qdev: add to BusState "hotplug-handler" link
>   qdev: add "hotpluggable" property to Device
>   hw/acpi: move typeinfo to the file end
>   qdev:pci: refactor PCIDevice to use generic "hotpluggable" property
>   acpi/piix4pm: convert ACPI PCI hotplug to use hotplug-handler API
>   pci/shpc: convert SHPC hotplug to use hotplug-handler API
>   pci/pcie: convert PCIE hotplug to use hotplug-handler API
>   hw/pci: switch to a generic hotplug handling for PCIDevice
> 
>  hw/acpi/pcihp.c                |   46 ++++++++++----
>  hw/acpi/piix4.c                |  128 +++++++++++++++++++++-------------------
>  hw/core/Makefile.objs          |    1 +
>  hw/core/hotplug.c              |   48 +++++++++++++++
>  hw/core/qdev.c                 |   50 ++++++++++++++-
>  hw/display/cirrus_vga.c        |    2 +-
>  hw/display/qxl.c               |    2 +-
>  hw/display/vga-pci.c           |    2 +-
>  hw/display/vmware_vga.c        |    2 +-
>  hw/i386/acpi-build.c           |    4 +-
>  hw/ide/piix.c                  |    4 +-
>  hw/isa/piix4.c                 |    2 +-
>  hw/pci-bridge/pci_bridge_dev.c |    9 +++
>  hw/pci-host/piix.c             |    6 +-
>  hw/pci/pci.c                   |   40 +------------
>  hw/pci/pcie.c                  |   65 ++++++++++++--------
>  hw/pci/pcie_port.c             |    8 +++
>  hw/pci/shpc.c                  |  124 ++++++++++++++++++++++++---------------
>  hw/usb/hcd-ehci-pci.c          |    2 +-
>  hw/usb/hcd-ohci.c              |    2 +-
>  hw/usb/hcd-uhci.c              |    2 +-
>  hw/usb/hcd-xhci.c              |    2 +-
>  include/hw/acpi/acpi.h         |    1 +
>  include/hw/acpi/pcihp.h        |   10 ++-
>  include/hw/hotplug.h           |   78 ++++++++++++++++++++++++
>  include/hw/pci/pci.h           |   13 ----
>  include/hw/pci/pci_bus.h       |    2 -
>  include/hw/pci/pcie.h          |    5 ++
>  include/hw/pci/shpc.h          |    8 +++
>  include/hw/qdev-core.h         |   15 +++++
>  tests/Makefile                 |    2 +-
>  31 files changed, 463 insertions(+), 222 deletions(-)
>  create mode 100644 hw/core/hotplug.c
>  create mode 100644 include/hw/hotplug.h