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    Subject[PATCH 04/20] x86/io_apic: add get_nr_irqs_gsi()
    Date
    From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    Impact: new interface to get max GSI

    Add get_nr_irqs_gsi() to return nr_irqs_gsi. Xen will use this to
    determine how many irqs it needs to reserve for hardware irqs.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Reviewed-by: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: x86@kernel.org
    Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
    ---
    arch/x86/include/asm/io_apic.h | 1 +
    arch/x86/kernel/apic/io_apic.c | 5 +++++
    2 files changed, 6 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
    index 9cb2edb..f27c681 100644
    --- a/arch/x86/include/asm/io_apic.h
    +++ b/arch/x86/include/asm/io_apic.h
    @@ -169,6 +169,7 @@ extern void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
    extern int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);

    extern void probe_nr_irqs_gsi(void);
    +extern int get_nr_irqs_gsi(void);

    extern int setup_ioapic_entry(int apic, int irq,
    struct IO_APIC_route_entry *entry,
    diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
    index e41ed24..8353c40 100644
    --- a/arch/x86/kernel/apic/io_apic.c
    +++ b/arch/x86/kernel/apic/io_apic.c
    @@ -3860,6 +3860,11 @@ void __init probe_nr_irqs_gsi(void)
    printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
    }

    +int get_nr_irqs_gsi(void)
    +{
    + return nr_irqs_gsi;
    +}
    +
    #ifdef CONFIG_SPARSE_IRQ
    int __init arch_probe_nr_irqs(void)
    {
    --
    1.7.0.1


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