xen: implement a debug-interrupt handler

[safe/jmp/linux-2.6] / arch / x86 / xen / smp.c

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index d61e4f8..92dd3db 100644 (file)
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -36,8 +36,9 @@
 #include "mmu.h"
 
 static cpumask_t xen_cpu_initialized_map;
-static DEFINE_PER_CPU(int, resched_irq);
-static DEFINE_PER_CPU(int, callfunc_irq);
+static DEFINE_PER_CPU(int, resched_irq) = -1;
+static DEFINE_PER_CPU(int, callfunc_irq) = -1;
+static DEFINE_PER_CPU(int, debug_irq) = -1;
 
 /*
  * Structure and data for smp_call_function(). This is designed to minimise
@@ -89,9 +90,7 @@ static __cpuinit void cpu_bringup_and_idle(void)
 static int xen_smp_intr_init(unsigned int cpu)
 {
        int rc;
-       const char *resched_name, *callfunc_name;
-
-       per_cpu(resched_irq, cpu) = per_cpu(callfunc_irq, cpu) = -1;
+       const char *resched_name, *callfunc_name, *debug_name;
 
        resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
        rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
@@ -115,6 +114,14 @@ static int xen_smp_intr_init(unsigned int cpu)
                goto fail;
        per_cpu(callfunc_irq, cpu) = rc;
 
+       debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
+       rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
+                                    IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
+                                    debug_name, NULL);
+       if (rc < 0)
+               goto fail;
+       per_cpu(debug_irq, cpu) = rc;
+
        return 0;
 
  fail:
@@ -122,6 +129,8 @@ static int xen_smp_intr_init(unsigned int cpu)
                unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL);
        if (per_cpu(callfunc_irq, cpu) >= 0)
                unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL);
+       if (per_cpu(debug_irq, cpu) >= 0)
+               unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL);
        return rc;
 }