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[Qemu-devel] [PATCH 00/15] qdev: make reset semantics more clear and con
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 00/15] qdev: make reset semantics more clear and consistent, reset qbuses under virtio devices |
Date: |
Mon, 17 Dec 2012 17:24:35 +0100 |
After discussion with mst on the topic of resetting virtio devices,
here is a series that hopefully clarifies the semantics of bus and
device resets.
After this series, there are two kinds of resets:
1) device-level reset is the kind of reset that you get with a register
write on the device. It will clear interrupts and DMAs among other things,
but not any bus-level state, for example it will not clear PCI BARs and
other configuration space data. It is done with qdev_reset_all.
2) bus-level reset is the kind of reset that you get with a register
write on the device that exports the bus (including triggering a device-level
reset on the device that exports the bus). It will do a device-level
reset on the child, but also clear bus-level state such as PCI BARs and
other configuration space data. It can be triggered for all devices
on a bus with qbus_reset_all. There is still no API for a bus-level
reset of a single device (like PCI FLR), this can be added later.
Patches 1-5 are miscellaneous fixes to the reset paths.
Patches 6-8 introduce qbus_reset_all and uses it.
Patches 9-12 switch qdev_reset_all and qbus_reset_all from pre-order
to post-order, and document the resulting semantics.
Finally, patches 13-15 adjust the virtio implementations to use qdev
device-level reset more extensively.
Paolo Bonzini (15):
qdev: do not reset a device until the parent has been initialized
intel-hda: do not reset codecs from intel_hda_reset
pci: clean up resetting of IRQs
virtio-pci: reset device before PCI layer
virtio-s390: add a reset function to virtio-s390 devices
qdev: add qbus_reset_all
pci: do not export pci_bus_reset
lsi: use qbus_reset_all to reset SCSI bus
qdev: allow both pre- and post-order vists in qdev walking functions
qdev: switch reset to post-order
qdev: remove device_reset
qdev: document reset semantics
virtio-pci: reset all qbuses too when writing to the status field
virtio-s390: reset all qbuses too when writing to the status field
virtio-serial: do not perform bus reset by hand
hw/intel-hda.c | 1 -
hw/lsi53c895a.c | 7 +----
hw/pci.c | 16 ++++------
hw/pci.h | 1 -
hw/pci_bridge.c | 2 +-
hw/qdev-core.h | 83 ++++++++++++++++++++++++++++++++++++++++++--------
hw/qdev.c | 70 +++++++++++++++++++++++++++---------------
hw/s390-virtio-bus.c | 16 +++++++++-
hw/virtio-pci.c | 27 +++++++---------
hw/virtio-serial-bus.c | 19 +++---------
10 files changed, 156 insertions(+), 86 deletions(-)
--
1.8.0.2
- [Qemu-devel] [PATCH 00/15] qdev: make reset semantics more clear and consistent, reset qbuses under virtio devices,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 03/15] pci: clean up resetting of IRQs, Paolo Bonzini, 2012/12/17
- [Qemu-devel] [PATCH 05/15] virtio-s390: add a reset function to virtio-s390 devices, Paolo Bonzini, 2012/12/17
- [Qemu-devel] [PATCH 06/15] qdev: add qbus_reset_all, Paolo Bonzini, 2012/12/17
- [Qemu-devel] [PATCH 04/15] virtio-pci: reset device before PCI layer, Paolo Bonzini, 2012/12/17