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Commit 3fc471ed authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds
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[PATCH] genirq: i386 irq: Dynamic irq support 



The current implementation of create_irq() is a hack but it is the current
hack that msi.c uses, and unfortunately the ``generic'' apic msi ops depend on
this hack.  Thus we are stuck this hack of assuming irq == vector until the
depencencies in the generic msi code are removed.

Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rajesh Shah <rajesh.shah@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b6cf2583

arch/i386/kernel/io_apic.c

+48 −0
Original line number Diff line number Diff line
@@ -2483,6 +2483,54 @@ static int __init ioapic_init_sysfs(void) 


device_initcall(ioapic_init_sysfs);



#ifdef CONFIG_PCI_MSI

/*

 * Dynamic irq allocate and deallocation for MSI

 */

int create_irq(void)

{

	/* Hack of the day: irq == vector.

	 *

	 * Ultimately this will be be more general,

	 * and not depend on the irq to vector identity mapping.

	 * But this version is needed until msi.c can cope with

	 * the more general form.

	 */

	int irq, vector;

	unsigned long flags;

	vector = assign_irq_vector(AUTO_ASSIGN);

	irq = vector;



	if (vector >= 0) {

		struct irq_desc *desc;



		spin_lock_irqsave(&vector_lock, flags);

		vector_irq[vector] = irq;

		irq_vector[irq] = vector;

		spin_unlock_irqrestore(&vector_lock, flags);



		set_intr_gate(vector, interrupt[irq]);



		dynamic_irq_init(irq);

	}

	return irq;

}



void destroy_irq(unsigned int irq)

{

	unsigned long flags;

	unsigned int vector;



	dynamic_irq_cleanup(irq);



	spin_lock_irqsave(&vector_lock, flags);

	vector = irq_vector[irq];

	vector_irq[vector] = -1;

	irq_vector[irq] = 0;

	spin_unlock_irqrestore(&vector_lock, flags);

}

#endif /* CONFIG_PCI_MSI */



/* --------------------------------------------------------------------------

                          ACPI-based IOAPIC Configuration

   -------------------------------------------------------------------------- */