x86/io_apic: add get_nr_irqs_gsi() (7b586d71) · Commits · 戴 / test

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> Acked-by:

Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org Cc: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/x86/include/asm/io_apic.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 void setup_ioapic_ids_from_mpc(void);

arch/x86/kernel/apic/io_apic.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -3649,6 +3649,11 @@ 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)
		{

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