Re: [PATCH 5/6] hw/ide/via: Connect IDE function output IRQs to the ISA function input

[Richard Henderson]

On 3/24/21 11:54 AM, Philippe Mathieu-Daudé wrote:
> To avoid abusing isa_get_irq(NULL) using a hidden ISA bridge
> under the hood, let the IDE function expose 2 output IRQs,
> and connect them to the ISA function inputs when creating
> the south bridge chipset model in vt82c686b_southbridge_init.
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>   hw/ide/via.c        | 19 +++++++++++++++++--
>   hw/mips/fuloong2e.c |  9 ++++++++-
>   2 files changed, 25 insertions(+), 3 deletions(-)


> @@ -112,7 +124,7 @@ static void via_ide_set_irq(void *opaque, int n, int level)
>           d->config[0x70 + n * 8] &= ~0x80;
>       }
>   
> -    qemu_set_irq(isa_get_irq(NULL, 14 + n), level);
> +    qemu_set_irq(s->irq[n], level);
>   }
>   
>   static void via_ide_reset(DeviceState *dev)
...
> diff --git a/hw/mips/fuloong2e.c b/hw/mips/fuloong2e.c
> index 931385c760f..f1c5db13b78 100644
> --- a/hw/mips/fuloong2e.c
> +++ b/hw/mips/fuloong2e.c
> @@ -203,12 +203,19 @@ static void vt82c686b_southbridge_init(PCIBus *pci_bus, 
> int slot, qemu_irq intc,
>                                          I2CBus **i2c_bus)
>   {
>       PCIDevice *dev;
> +    DeviceState *isa;
>   
>       dev = pci_create_simple_multifunction(pci_bus, PCI_DEVFN(slot, 0), true,
>                                             TYPE_VT82C686B_ISA);
> -    qdev_connect_gpio_out_named(DEVICE(dev), "intr", 0, intc);
> +    isa = DEVICE(dev);
> +    qdev_connect_gpio_out_named(isa, "intr", 0, intc);
>   
>       dev = pci_create_simple(pci_bus, PCI_DEVFN(slot, 1), "via-ide");
> +    for (unsigned i = 0; i < 2; i++) {
> +        qdev_connect_gpio_out_named(DEVICE(dev), "ide-irq", i,

                                       ^^^^^^^^^^^ isa?

> +                                    qdev_get_gpio_in_named(isa,
> +                                                           "isa-irq", 14 + i));
> +    }

It all looks a little funny, but I think I follow it, and see that it can't be 
split further, because of the movement of the +14.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~