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authorEric W. Biederman <ebiederm@xmission.com>2006-10-04 02:16:40 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 07:55:28 -0700
commitc4fa0bbf384496ae4acc0a150719d9d8fa8d11b3 (patch)
treecbca26057c0f0de9df559bb825820c3a92cb83b9 /arch/x86_64
parent3fc471ede99579211c44b6a64829c4318976990f (diff)
[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 <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: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/io_apic.c51
1 files changed, 46 insertions, 5 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 12dd938f5d5..fd52fcb6fa1 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
-------------------------------------------------------------------------- */