[RFC PATCH 0/3] qdev: Introduce QDEV_DECLARE_DEV_BUS_TYPES() macro

[Philippe Mathieu-Daudé]

Experiment after discussing with Thomas around qdev_get_parent_bus:
ad356f64-dca0-8117-d22a-a530e620ddb0@redhat.com/">https://lore.kernel.org/qemu-devel/ad356f64-dca0-8117-d22a-a530e620ddb0@redhat.com/

When a QDev plug on a QBus, we'll always use qdev_get_parent_bus()
at least once with this type. Why not provide a consistent defined
macro instead of:
 1/ adding an inlined helper such usb_bus_from_device()
    or scsi_bus_from_device() with different type checks,
 2/ open-code calls to qdev_get_parent_bus() with unsafe casts
?

This RFC series introduce a QDev-equivalent of QOM DECLARE_TYPES
macro, to be used with a (device, bus) tuple, and declaring the
equivalent device_GET_BUS() macro.

hw/usb/ is converted as an example.

Philippe Mathieu-Daudé (3):
  hw/qdev: Introduce QDEV_DECLARE_DEV_BUS_TYPES() macro
  hw/usb: Declare QOM macros using QDEV_DECLARE_DEV_BUS_TYPES()
  hw/usb: Use USB_DEVICE_GET_BUS() macro

 hw/usb/bus.c           | 10 +++++-----
 hw/usb/core.c          |  6 +++---
 hw/usb/dev-hub.c       |  4 ++--
 hw/usb/dev-serial.c    | 10 +++++-----
 hw/usb/hcd-xhci.c      |  2 +-
 include/hw/qdev-core.h | 28 ++++++++++++++++++++++++++++
 include/hw/usb.h       | 13 ++++---------
 7 files changed, 48 insertions(+), 25 deletions(-)

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2.38.1