xen: implement a debug-interrupt handler
Xen supports the notion of a debug interrupt which can be triggered
from the console. For now this is implemented to show pending events,
masks and each CPU's pending event set.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index d61e4f8..92dd3db 100644
--- 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 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 @@
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 @@
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;
}