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[Qemu-devel] [PATCH v4 00/16] piix_pci cleanup

From: Juan Quintela
Subject: [Qemu-devel] [PATCH v4 00/16] piix_pci cleanup
Date: Fri, 28 Aug 2009 15:28:10 +0200


- rebase to today git. conflicted with now init functions return int.
- moved to new vmstate infrastructure
- fix vmstate to work well with substructures (we need 
  subsections to do it right).

Later, Juan.

- rebase to today git.  Fix conflicts with avi pic/isa cleanup.

- bit the bullet, change irq_opaque to void *, instead of qemu_irq *
  that allows us to pass anything there.
- Rearrange piix_pci to be able to add piix3_dev to the irq_state
- Once rearrangmente is fixed, make sane SaveVM *_load/_save() functions.
  We can still load old state, but we only write the sane one.

mips_malta can do a similar cleanup, it is not difficult to do.  But I can't
test it.

About irq_state in i440fx_init().  It would have been easier, if there were a
way to create i440FX-pcihost giving it the already allocated variable.

pci_bus = pci_register_bus()           -> needs irq_state
i440fx = pci_create_simple(pci_bus, ..) -> needs pci_bus
piix3 = pci_create_simple (pci_bus, ...) -> needs pci_bus

irq_state -> needs piix3

We have a nice circular dependency here. to fix it, I just create an empty
irq_state, passed it to pci_register_bus() and fill it later.

It would have been a bit cleaner if there were a finction like
i440fx = pci_create_simple_here(..., &i440fx).

Later, Juan.

- split piix4 from piix_pci.  The only shared code where piix_save/load, i.e.
  almost nothing.  Once there, compile piix4.o only for mips (it was not used
  anywhere else).
- Move global variables to PCII440FXState.  Nice and clean until....
- pci_irq_levels: This is great:
  * it is saved/loaded from i440fx
  * it is cleaned during reset in piix3
  * it is used in piix3_set_irq, that don't receive neither i440fx nor
    piix state, it needs to be a global variable. (created a global link
    until a better solution appear).

I looked where to "hide" pci_irq_levels and piix3_dev (both needed in
piix3_set_irq), and didn't found where to pass them, out of:
- hack i8259 to hide it into PicState2 (that one got passed through the pic)
  ugly for words, but will work
- try to add <something> at setup_irq time, but at that point we have:
  * opaque -> pci_dev of device that we are working with
  * from there we can get to the bus that the device is attached to,
    but no way to go from there to the Host bridge (that is what we wanted
    in the 1st place)

Later, Juan.

Juan Quintela (16):
  piix4 don't use pci_irq_levels at all
  Split piix4 support from piix_pci.c
  low_set_irq is not used anywhere
  Use PCII440FXState instead of generic PCIDevice
  Move smm_enabled and isa_memory_mappings to PCII440FXState
  We want the argument pass to set_irq to be opaque
  Create PIIX3State instead of using PCIDevice for PIIX3
  Introduce PIIX3IrqState for piix3 irq's state
  Fold piix3_init() intto i440fx_init
  We can add piix3_dev now to PIIX3IrqState
  Save irq_state into PCII440FXState
  pci_irq_levels[] belong to PIIX3State
  Update SaveVM versions
  VMState: Fix sub-structs versioning
  i440fx: use new vmstate infrastructure
  piix3: use new vmstate infrastructure

 Makefile.target    |    2 +-
 hw/apb_pci.c       |    4 +-
 hw/grackle_pci.c   |    4 +-
 hw/gt64xxx.c       |    3 +-
 hw/pc.c            |    5 +-
 hw/pc.h            |   11 ++-
 hw/pci.c           |    8 +-
 hw/pci.h           |    6 +-
 hw/piix4.c         |  128 ++++++++++++++++++++++++
 hw/piix_pci.c      |  275 +++++++++++++++++++++-------------------------------
 hw/ppc4xx_pci.c    |    4 +-
 hw/ppce500_pci.c   |    4 +-
 hw/prep_pci.c      |    4 +-
 hw/r2d.c           |    4 +-
 hw/sh_pci.c        |    4 +-
 hw/unin_pci.c      |    4 +-
 hw/versatile_pci.c |    4 +-
 savevm.c           |    2 +-
 18 files changed, 284 insertions(+), 192 deletions(-)
 create mode 100644 hw/piix4.c

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