Re: [Qemu-devel] [PATCH v7 4/4] PC: differentiate hpet's interrupt capability on piix and q35

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Oct 17, 2013 at 11:16:05AM +0800, Liu Ping Fan wrote:
> For pc-piix-*, hpet's intcap is always hard coded as IRQ2.
> For q35, if it is pc-q35-1.7 and earlier, we use IRQ2 for compat
> reason, otherwise IRQ2, IRQ8, and IRQ16~23 are allowed.
> 
> Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
> ---
>  hw/i386/pc.c         | 20 +++++++++++++++-----
>  hw/i386/pc_piix.c    |  7 ++++++-
>  hw/i386/pc_q35.c     |  6 +++++-
>  include/hw/i386/pc.h | 11 ++++++++++-
>  4 files changed, 36 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 72cc850..3e98ff0 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1219,7 +1219,8 @@ static const MemoryRegionOps ioportF0_io_ops = {
>  void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
>                            ISADevice **rtc_state,
>                            ISADevice **floppy,
> -                          bool no_vmport)
> +                          bool no_vmport,
> +                          bool hpet_irqs)
>  {
>      int i;
>      DriveInfo *fd[MAX_FD];
> @@ -1249,10 +1250,19 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
>          /* In order to set property, here not using sysbus_try_create_simple */
>          hpet = qdev_try_create(NULL, "hpet");
>          if (hpet) {
> -            /* tmp fix. For compat, hard code to IRQ2 until we have correct
> -             * compat property and differentiate pc-iix with pc-q35
> -             */
> -            qdev_prop_set_uint32(hpet, HPET_INTCAP, 0x4);
> +            /* For pc-piix-*, hpet's intcap is always IRQ2. */
> +            if (!hpet_irqs) {

So for piix the property is ignored even if set.

> +                qdev_prop_set_uint32(hpet, HPET_INTCAP, 0x4);
> +            } else {
> +                /* For pc-q35-1.7 and earlier, use IRQ2 for compat.

Now you lost me. It's still 4 for 1.7?
You only target 1.8 then?

> +                 * Otherwise, use IRQ16~23, IRQ8 and IRQ2.
> +                 */
> +                uint8_t compat = object_property_get_int(OBJECT(hpet),
> +                        HPET_INTCAP, NULL);
> +                if (!compat) {
> +                    qdev_prop_set_uint32(hpet, HPET_INTCAP, 0xff0104);
> +                }
> +            }
>              qdev_init_nofail(hpet);
>              sysbus_mmio_map(SYS_BUS_DEVICE(hpet), 0, HPET_BASE);
>  
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index c6042c7..a45ce11 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -180,7 +180,8 @@ static void pc_init1(QEMUMachineInitArgs *args,
>      pc_vga_init(isa_bus, pci_enabled ? pci_bus : NULL);
>  
>      /* init basic PC hardware */
> -    pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, xen_enabled());
> +    pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, xen_enabled(),
> +        false);
>  
>      pc_nic_init(isa_bus, pci_bus);
>  
> @@ -346,6 +347,10 @@ static QEMUMachine pc_i440fx_machine_v1_7 = {
>      .alias = "pc",
>      .init = pc_init_pci,
>      .is_default = 1,
> +    .compat_props = (GlobalProperty[]) {
> +        PC_COMPAT_1_7,

So you add this property for PIIX but it's then ignored?
That's kind of ugly.
Not sure how to fix this. Paolo?

> +        { /* end of list */ }
> +    },
>  };
>  
>  #define PC_I440FX_1_6_MACHINE_OPTIONS PC_I440FX_MACHINE_OPTIONS
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index ca84e1c..124ecc1 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -181,7 +181,7 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
>      pc_register_ferr_irq(gsi[13]);
>  
>      /* init basic PC hardware */
> -    pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, false);
> +    pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, false, true);
>  
>      /* connect pm stuff to lpc */
>      ich9_lpc_pm_init(lpc);
> @@ -270,6 +270,10 @@ static QEMUMachine pc_q35_machine_v1_7 = {
>      .name = "pc-q35-1.7",
>      .alias = "q35",
>      .init = pc_q35_init,
> +    .compat_props = (GlobalProperty[]) {
> +        PC_COMPAT_1_7,
> +        { /* end of list */ }
> +    },
>  };
>  
>  #define PC_Q35_1_6_MACHINE_OPTIONS PC_Q35_MACHINE_OPTIONS
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 1361a27..bfeccf2 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -136,7 +136,8 @@ DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus *pci_bus);
>  void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
>                            ISADevice **rtc_state,
>                            ISADevice **floppy,
> -                          bool no_vmport);
> +                          bool no_vmport,
> +                          bool hpet_irqs);
>  void pc_init_ne2k_isa(ISABus *bus, NICInfo *nd);
>  void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
>                    const char *boot_device,
> @@ -227,7 +228,15 @@ void pvpanic_init(ISABus *bus);
>  
>  int e820_add_entry(uint64_t, uint64_t, uint32_t);
>  
> +#define PC_COMPAT_1_7 \
> +        {\
> +            .driver   = "hpet",\
> +            .property = HPET_INTCAP,\
> +            .value    = stringify(4),\
> +        }
> +
>  #define PC_COMPAT_1_6 \
> +        PC_COMPAT_1_7, \
>          {\
>              .driver   = "e1000",\
>              .property = "mitigation",\
> -- 
> 1.8.1.4