Re: [Xen-devel] [PATCH v2 03/20] piix4: Add a i8259 Interrupt Controller as specified in datasheet

[Esteban Bosse <estebanbosse@xxxxxxxxx>]

El vie, 18-10-2019 a las 15:47 +0200, Philippe Mathieu-Daudé escribió:
> From: Hervé Poussineau <hpoussin@xxxxxxxxxxx>
> 
> Add ISA irqs as piix4 gpio in, and CPU interrupt request as piix4
> gpio out.
> Remove i8259 instanciated in malta board, to not have it twice.
> 
> We can also remove the now unused piix4_init() function.
> 
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Hervé Poussineau <hpoussin@xxxxxxxxxxx>
> Message-Id: <20171216090228.28505-8-hpoussin@xxxxxxxxxxx>
> Reviewed-by: Aleksandar Markovic <amarkovic@xxxxxxxxxxxx>
> [PMD: rebased, updated includes, use ISA_NUM_IRQS in for loop]
> Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> ---
>  hw/isa/piix4.c       | 43 ++++++++++++++++++++++++++++++++--------
> ---
>  hw/mips/mips_malta.c | 32 +++++++++++++-------------------
>  include/hw/i386/pc.h |  1 -
>  3 files changed, 45 insertions(+), 31 deletions(-)
> 
> diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
> index d0b18e0586..9c37c85ae2 100644
> --- a/hw/isa/piix4.c
> +++ b/hw/isa/piix4.c
> @@ -24,6 +24,7 @@
>   */
>  
>  #include "qemu/osdep.h"
> +#include "hw/irq.h"
>  #include "hw/i386/pc.h"
>  #include "hw/pci/pci.h"
>  #include "hw/isa/isa.h"
> @@ -36,6 +37,8 @@ PCIDevice *piix4_dev;
>  
>  typedef struct PIIX4State {
>      PCIDevice dev;
> +    qemu_irq cpu_intr;
> +    qemu_irq *isa;
>  
>      /* Reset Control Register */
>      MemoryRegion rcr_mem;
> @@ -94,6 +97,18 @@ static const VMStateDescription vmstate_piix4 = {
>      }
>  };
>  
> +static void piix4_request_i8259_irq(void *opaque, int irq, int
> level)
> +{
> +    PIIX4State *s = opaque;
> +    qemu_set_irq(s->cpu_intr, level);
> +}
I would like to understand why in `PIIX4State *s = opaque;` its not
necessary a cast or a object macro magic.
Something like:
PIIX4State *s = (PIIX4State*)opaque;
PIIX4State *s = PIIX4STATE(opaque); 
> +
> +static void piix4_set_i8259_irq(void *opaque, int irq, int level)
> +{
> +    PIIX4State *s = opaque;
> +    qemu_set_irq(s->isa[irq], level);
> +}
> +
>  static void piix4_rcr_write(void *opaque, hwaddr addr, uint64_t val,
>                              unsigned int len)
>  {
> @@ -127,29 +142,35 @@ static const MemoryRegionOps piix4_rcr_ops = {
>  static void piix4_realize(PCIDevice *dev, Error **errp)
>  {
>      PIIX4State *s = PIIX4_PCI_DEVICE(dev);
> +    ISABus *isa_bus;
> +    qemu_irq *i8259_out_irq;
>  
> -    if (!isa_bus_new(DEVICE(dev), pci_address_space(dev),
> -                     pci_address_space_io(dev), errp)) {
> +    isa_bus = isa_bus_new(DEVICE(dev), pci_address_space(dev),
> +                          pci_address_space_io(dev), errp);
> +    if (!isa_bus) {
>          return;
>      }
>  
> +    qdev_init_gpio_in_named(DEVICE(dev), piix4_set_i8259_irq,
> +                            "isa", ISA_NUM_IRQS);
> +    qdev_init_gpio_out_named(DEVICE(dev), &s->cpu_intr,
> +                             "intr", 1);
> +
>      memory_region_init_io(&s->rcr_mem, OBJECT(dev), &piix4_rcr_ops,
> s,
>                            "reset-control", 1);
>      memory_region_add_subregion_overlap(pci_address_space_io(dev),
> 0xcf9,
>                                          &s->rcr_mem, 1);
>  
> +    /* initialize i8259 pic */
> +    i8259_out_irq = qemu_allocate_irqs(piix4_request_i8259_irq, s,
> 1);
> +    s->isa = i8259_init(isa_bus, *i8259_out_irq);
> +
> +    /* initialize ISA irqs */
> +    isa_bus_irqs(isa_bus, s->isa);
> +
>      piix4_dev = dev;
>  }
>  
> -int piix4_init(PCIBus *bus, ISABus **isa_bus, int devfn)
> -{
> -    PCIDevice *d;
> -
> -    d = pci_create_simple_multifunction(bus, devfn, true, "PIIX4");
> -    *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(d), "isa.0"));
> -    return d->devfn;
> -}
> -
>  static void piix4_class_init(ObjectClass *klass, void *data)
>  {
>      DeviceClass *dc = DEVICE_CLASS(klass);
> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
> index 4d9c64b36a..7d25ab6c23 100644
> --- a/hw/mips/mips_malta.c
> +++ b/hw/mips/mips_malta.c
> @@ -97,7 +97,7 @@ typedef struct {
>      SysBusDevice parent_obj;
>  
>      MIPSCPSState cps;
> -    qemu_irq *i8259;
> +    qemu_irq i8259[16];
>  } MaltaState;
>  
>  static ISADevice *pit;
> @@ -1235,8 +1235,8 @@ void mips_malta_init(MachineState *machine)
>      int64_t kernel_entry, bootloader_run_addr;
>      PCIBus *pci_bus;
>      ISABus *isa_bus;
> -    qemu_irq *isa_irq;
>      qemu_irq cbus_irq, i8259_irq;
> +    PCIDevice *pci;
>      int piix4_devfn;
>      I2CBus *smbus;
>      DriveInfo *dinfo;
> @@ -1407,30 +1407,24 @@ void mips_malta_init(MachineState *machine)
>      /* Board ID = 0x420 (Malta Board with CoreLV) */
>      stl_p(memory_region_get_ram_ptr(bios_copy) + 0x10, 0x00000420);
>  
> -    /*
> -     * We have a circular dependency problem: pci_bus depends on
> isa_irq,
> -     * isa_irq is provided by i8259, i8259 depends on ISA, ISA
> depends
> -     * on piix4, and piix4 depends on pci_bus.  To stop the cycle we
> have
> -     * qemu_irq_proxy() adds an extra bit of indirection, allowing
> us
> -     * to resolve the isa_irq -> i8259 dependency after i8259 is
> initialized.
> -     */
> -    isa_irq = qemu_irq_proxy(&s->i8259, 16);
> -
>      /* Northbridge */
> -    pci_bus = gt64120_register(isa_irq);
> +    pci_bus = gt64120_register(s->i8259);
>  
>      /* Southbridge */
>      ide_drive_get(hd, ARRAY_SIZE(hd));
>  
> -    piix4_devfn = piix4_init(pci_bus, &isa_bus, 80);
> +    pci = pci_create_simple_multifunction(pci_bus, PCI_DEVFN(10, 0),
> +                                          true, "PIIX4");
> +    dev = DEVICE(pci);
> +    isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
> +    piix4_devfn = pci->devfn;
>  
> -    /*
> -     * Interrupt controller
> -     * The 8259 is attached to the MIPS CPU INT0 pin, ie interrupt 2
> -     */
> -    s->i8259 = i8259_init(isa_bus, i8259_irq);
> +    /* Interrupt controller */
> +    qdev_connect_gpio_out_named(dev, "intr", 0, i8259_irq);
> +    for (int i = 0; i < ISA_NUM_IRQS; i++) {
> +        s->i8259[i] = qdev_get_gpio_in_named(dev, "isa", i);
> +    }
>  
> -    isa_bus_irqs(isa_bus, s->i8259);
>      pci_piix4_ide_init(pci_bus, hd, piix4_devfn + 1);
>      pci_create_simple(pci_bus, piix4_devfn + 2, "piix4-usb-uhci");
>      smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100,
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 37bfd95113..374f3e8835 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -286,7 +286,6 @@ PCIBus *i440fx_init(const char *host_type, const
> char *pci_type,
>  PCIBus *find_i440fx(void);
>  /* piix4.c */
>  extern PCIDevice *piix4_dev;
> -int piix4_init(PCIBus *bus, ISABus **isa_bus, int devfn);
>  
>  /* pc_sysfw.c */
>  void pc_system_flash_create(PCMachineState *pcms);


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