From 0b9f4f49e2abe787673de8f1f56f053fb30fec24 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" 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 Signed-off-by: Ingo Molnar --- 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 f930885ac6..848411753c 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); -- 2.39.5