From 0b9f4f49e2abe787673de8f1f56f053fb30fec24 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Tue, 1 Jul 2008 01:19:31 +0100
Subject: [PATCH] x86: I/O APIC: Add a 64-bit variation of replace_pin_at_irq()
When an interrupt is rerouted to a different I/O APIC pin the relevant
entry of the irq_2_pin list should get updated accordingly so that
operations are performed on the correct redirection entry.
This is already done by the 32-bit variation of the code and here is a
complementing 64-bit implementation. Should make someone's decision less
tough when merging the two. ;)
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/io_apic_64.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index f930885ac667..848411753c7c 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -373,6 +373,26 @@ static void add_pin_to_irq(unsigned int irq, int apic, int pin)
entry->pin = pin;
}
+/*
+ * Reroute an IRQ to a different pin.
+ */
+static void __init replace_pin_at_irq(unsigned int irq,
+ int oldapic, int oldpin,
+ int newapic, int newpin)
+{
+ struct irq_pin_list *entry = irq_2_pin + irq;
+
+ while (1) {
+ if (entry->apic == oldapic && entry->pin == oldpin) {
+ entry->apic = newapic;
+ entry->pin = newpin;
+ }
+ if (!entry->next)
+ break;
+ entry = irq_2_pin + entry->next;
+ }
+}
+
#define DO_ACTION(name,R,ACTION, FINAL) \
\
@@ -1735,7 +1755,7 @@ static inline void __init check_timer(void)
/*
* legacy devices should be connected to IO APIC #0
*/
- /* replace_pin_at_irq(0, apic1, pin1, apic2, pin2); */
+ replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
unmask_IO_APIC_irq(0);
enable_8259A_irq(0);
--
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