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authorThomas Gleixner <tglx@linutronix.de>2007-02-16 01:27:25 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:56 -0800
commit771ee3b04eaac6184312825eb600b4c598f027a5 (patch)
treef0db1cca6b9849855c1d2fd6a16828084311e03c /kernel/irq/manage.c
parent950f4427c2ddc921164088a20f01304cf231437c (diff)
[PATCH] Add a function to handle interrupt affinity setting
Provide funtions to: - check, whether an interrupt can set the affinity - pin the interrupt to a given cpu Necessary for the ability to setup clocksources more flexible (e.g. use the different HPET channels per CPU) [akpm@osdl.org: alpha build fix] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/irq/manage.c')
-rw-r--r--kernel/irq/manage.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index cd790ad0ae5..5597c157442 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -38,6 +38,46 @@ void synchronize_irq(unsigned int irq)
}
EXPORT_SYMBOL(synchronize_irq);
+/**
+ * irq_can_set_affinity - Check if the affinity of a given irq can be set
+ * @irq: Interrupt to check
+ *
+ */
+int irq_can_set_affinity(unsigned int irq)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
+ !desc->chip->set_affinity)
+ return 0;
+
+ return 1;
+}
+
+/**
+ * irq_set_affinity - Set the irq affinity of a given irq
+ * @irq: Interrupt to set affinity
+ * @cpumask: cpumask
+ *
+ */
+int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (!desc->chip->set_affinity)
+ return -EINVAL;
+
+ set_balance_irq_affinity(irq, cpumask);
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+ set_pending_irq(irq, cpumask);
+#else
+ desc->affinity = cpumask;
+ desc->chip->set_affinity(irq, cpumask);
+#endif
+ return 0;
+}
+
#endif
/**