From c4fa0bbf384496ae4acc0a150719d9d8fa8d11b3 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 4 Oct 2006 02:16:40 -0700 Subject: [PATCH] [PATCH] genirq: x86_64 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 this hack of assuming irq == vector until the depencencies in the generic irq code are removed. Signed-off-by: Eric W. Biederman Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Benjamin Herrenschmidt Cc: Rajesh Shah Cc: Andi Kleen Cc: "Protasevich, Natalie" Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/io_apic.c | 51 ++++++++++++++++++++++++++++++++---- 1 file changed, 46 insertions(+), 5 deletions(-) diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index 12dd938f5d54..fd52fcb6fa16 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -1254,11 +1254,6 @@ static int ioapic_retrigger_vector(unsigned int vector) * races. */ -static void ack_apic(unsigned int irq) -{ - ack_APIC_irq(); -} - static void ack_apic_edge(unsigned int irq) { move_native_irq(irq); @@ -1698,6 +1693,52 @@ 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) { + 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 + /* -------------------------------------------------------------------------- ACPI-based IOAPIC Configuration -------------------------------------------------------------------------- */ -- 2.30.2