Re: [PATCH v2 5/6] hw/ide/via: Connect IDE function output IRQs to the ISA function input

[John Snow]

On 5/11/21 12:18 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.

Seems reasonable on the surface. How do I test this? How did you test it?

--js

> 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(-)
>
> diff --git a/hw/ide/via.c b/hw/ide/via.c
> index 6c667a92130..7887bf181e6 100644
> --- a/hw/ide/via.c
> +++ b/hw/ide/via.c
> @@ -33,6 +33,17 @@
>   #include "hw/ide/pci.h"
>   #include "trace.h"
>   
> +#define TYPE_VIA_IDE "via-ide"
> +OBJECT_DECLARE_SIMPLE_TYPE(VIAIDEState, VIA_IDE)
> +
> +struct VIAIDEState {
> +    /* <private> */
> +    PCIIDEState parent_obj;
> +    /* <public> */
> +
> +    qemu_irq irq[2];
> +};
> +
>   static uint64_t bmdma_read(void *opaque, hwaddr addr,
>                              unsigned size)
>   {
> @@ -105,6 +116,7 @@ static void bmdma_setup_bar(PCIIDEState *d)
>   static void via_ide_set_irq(void *opaque, int n, int level)
>   {
>       PCIDevice *d = PCI_DEVICE(opaque);
> +    VIAIDEState *s = VIA_IDE(d);
>   
>       if (level) {
>           d->config[0x70 + n * 8] |= 0x80;
> @@ -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)
> @@ -159,6 +171,7 @@ static void via_ide_reset(DeviceState *dev)
>   
>   static void via_ide_realize(PCIDevice *dev, Error **errp)
>   {
> +    VIAIDEState *s = VIA_IDE(dev);
>       PCIIDEState *d = PCI_IDE(dev);
>       DeviceState *ds = DEVICE(dev);
>       uint8_t *pci_conf = dev->config;
> @@ -188,6 +201,7 @@ static void via_ide_realize(PCIDevice *dev, Error **errp)
>       bmdma_setup_bar(d);
>       pci_register_bar(dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &d->bmdma_bar);
>   
> +    qdev_init_gpio_out_named(ds, s->irq, "ide-irq", ARRAY_SIZE(s->irq));
>       qdev_init_gpio_in(ds, via_ide_set_irq, ARRAY_SIZE(d->bus));
>       for (i = 0; i < ARRAY_SIZE(d->bus); i++) {
>           ide_bus_new(&d->bus[i], sizeof(d->bus[i]), ds, i, MAX_IDE_DEVS);
> @@ -227,8 +241,9 @@ static void via_ide_class_init(ObjectClass *klass, void 
> *data)
>   }
>   
>   static const TypeInfo via_ide_info = {
> -    .name          = "via-ide",
> +    .name          = TYPE_VIA_IDE,
>       .parent        = TYPE_PCI_IDE,
> +    .instance_size = sizeof(VIAIDEState),
>       .class_init    = via_ide_class_init,
>   };
>   
> diff --git a/hw/mips/fuloong2e.c b/hw/mips/fuloong2e.c
> index 3e7a7e4389d..17b5e41cc7d 100644
> --- a/hw/mips/fuloong2e.c
> +++ b/hw/mips/fuloong2e.c
> @@ -201,12 +201,19 @@ 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,
> +                                    qdev_get_gpio_in_named(isa,
> +                                                           "isa-irq", 14 + i));
> +    }
>       pci_ide_create_devs(dev);
>   
>       pci_create_simple(pci_bus, PCI_DEVFN(slot, 2), "vt82c686b-usb-uhci");