genirq: Expose default irq affinity mask (take 3)

Current IRQ affinity interface does not provide a way to set affinity
for the IRQs that will be allocated/activated in the future.
This patch creates /proc/irq/default_smp_affinity that lets users set
default affinity mask for the newly allocated IRQs. Changing the default
does not affect affinity masks for the currently active IRQs, they
have to be changed explicitly.

Updated based on Paul J's comments and added some more documentation.

Signed-off-by: Max Krasnyansky <maxk@qualcomm.com>
Cc: pj@sgi.com
Cc: a.p.zijlstra@chello.nl
Cc: tglx@linutronix.de
Cc: rdunlap@xenotime.net
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 26 insertions, 2 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 46d6611a33bb..469814e9b9ee 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -17,6 +17,8 @@
 
 #ifdef CONFIG_SMP
 
+cpumask_t irq_default_affinity = CPU_MASK_ALL;
+
 /**
  *      synchronize_irq - wait for pending IRQ handlers (on other CPUs)
  *      @irq: interrupt number to wait for
@@ -95,6 +97,27 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
         return 0;
 }
 
+#ifndef CONFIG_AUTO_IRQ_AFFINITY
+/*
+ * Generic version of the affinity autoselector.
+ */
+int irq_select_affinity(unsigned int irq)
+{
+        cpumask_t mask;
+
+        if (!irq_can_set_affinity(irq))
+                return 0;
+
+        cpus_and(mask, cpu_online_map, irq_default_affinity);
+
+        irq_desc[irq].affinity = mask;
+        irq_desc[irq].chip->set_affinity(irq, mask);
+
+        set_balance_irq_affinity(irq, mask);
+        return 0;
+}
+#endif
+
 #endif
 
 /**
@@ -382,6 +405,9 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                 } else
                         /* Undo nested disables: */
                         desc->depth = 1;
+
+                /* Set default affinity mask once everything is setup */
+                irq_select_affinity(irq);
         }
         /* Reset broken irq detection when installing new handler */
         desc->irq_count = 0;
@@ -571,8 +597,6 @@ int request_irq(unsigned int irq, irq_handler_t handler,
         action->next = NULL;
         action->dev_id = dev_id;
 
-        select_smp_affinity(irq);
-
 #ifdef CONFIG_DEBUG_SHIRQ
         if (irqflags & IRQF_SHARED) {
                 /*