Peter,
I sent this patch a while back as part of the "PV on HVM: receive
interrupts as xen events" series (that it is based upon Konrad's
pcifront series, he sent another version to the list yesterday).
Do you think that this is a reasonble approach?
If you want to give a look at the whole series you can find it here:
http://lkml.org/lkml/2010/8/30/170
everything else is Xen specific stuff.
Thanks in advance,
Stefano
On Mon, 30 Aug 2010, stefano.stabellini@xxxxxxxxxxxxx wrote:
> From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
>
> Rather than using a tree of conditionals, use function pointer
> for acpi_register_gsi.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> arch/x86/kernel/acpi/boot.c | 59 ++++++++++++++++++++++++++++++------------
> 1 files changed, 42 insertions(+), 17 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index c05872a..031f0c2 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -513,35 +513,61 @@ int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
> return 0;
> }
>
> -/*
> - * success: return IRQ number (>=0)
> - * failure: return < 0
> - */
> -int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
> +static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
> + int trigger, int polarity)
> {
> - unsigned int irq;
> - unsigned int plat_gsi = gsi;
> -
> #ifdef CONFIG_PCI
> /*
> * Make sure all (legacy) PCI IRQs are set as level-triggered.
> */
> - if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
> - if (trigger == ACPI_LEVEL_SENSITIVE)
> - eisa_set_level_irq(gsi);
> - }
> + if (trigger == ACPI_LEVEL_SENSITIVE)
> + eisa_set_level_irq(gsi);
> #endif
>
> + return gsi;
> +}
> +
> +static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
> + int trigger, int polarity)
> +{
> #ifdef CONFIG_X86_IO_APIC
> - if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
> - plat_gsi = mp_register_gsi(dev, gsi, trigger, polarity);
> - }
> + gsi = mp_register_gsi(dev, gsi, trigger, polarity);
> #endif
> +
> + return gsi;
> +}
> +
> +static int (*__acpi_register_gsi)(struct device *dev, u32 gsi, int trigger,
> int polarity) = acpi_register_gsi_pic;
> +
> +/*
> + * success: return IRQ number (>=0)
> + * failure: return < 0
> + */
> +int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
> +{
> + unsigned int irq;
> + unsigned int plat_gsi = gsi;
> +
> + plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity);
> irq = gsi_to_irq(plat_gsi);
>
> return irq;
> }
>
> +void __init acpi_set_irq_model_pic(void)
> +{
> + acpi_irq_model = ACPI_IRQ_MODEL_PIC;
> + __acpi_register_gsi = acpi_register_gsi_pic;
> + acpi_ioapic = 0;
> +}
> +
> +void __init acpi_set_irq_model_ioapic(void)
> +{
> + acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
> + __acpi_register_gsi = acpi_register_gsi_ioapic;
> + acpi_ioapic = 1;
> +}
> +
> /*
> * ACPI based hotplug support for CPU
> */
> @@ -1259,8 +1285,7 @@ static void __init acpi_process_madt(void)
> */
> error = acpi_parse_madt_ioapic_entries();
> if (!error) {
> - acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
> - acpi_ioapic = 1;
> + acpi_set_irq_model_ioapic();
>
> smp_found_config = 1;
> }
> --
> 1.5.6.5
>
> --
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