Messages in this thread Patch in this message | | | From | "Eric W. Biederman" <> | Subject | [PATCH 12/25] x86_64 irq: Dynamic irq support | Date | Tue, 20 Jun 2006 16:28:25 -0600 |
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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 <ebiederm@xmission.com> --- arch/x86_64/kernel/io_apic.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index f50be45..ae64a63 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -2013,6 +2013,54 @@ 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 + /* -------------------------------------------------------------------------- ACPI-based IOAPIC Configuration -------------------------------------------------------------------------- */ -- 1.4.0.gc07e - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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