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Re: [Qemu-devel] [PATCH 0/5] piix_pci cleanup

From: Blue Swirl
Subject: Re: [Qemu-devel] [PATCH 0/5] piix_pci cleanup
Date: Fri, 21 Aug 2009 22:59:10 +0300

On Fri, Aug 21, 2009 at 8:36 PM, Juan Quintela<address@hidden> wrote:
> Hi
> This series:
> - 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)
> Notice that this is needed for both pc and mips_malta.c
> Ideas on where to hide a pci_dev inside a bus?

pci_set_irq_fn should take an opaque state pointer (given at
pci_register_bus time):

typedef void (*pci_set_irq_fn)(void *opaque, qemu_irq *pic, int
irq_num, int level);

PCIBus *pci_register_bus(DeviceState *parent, const char *name,
                         pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
                         qemu_irq *pic, void *irq_opaque, int
devfn_min, int nirq);

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