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>

3 files changed, 64 insertions, 5 deletions

diff --git a/arch/x86/xen/events.c b/arch/x86/xen/events.c
index dcf613e17581..0140981e93c4 100644
--- a/arch/x86/xen/events.c
+++ b/arch/x86/xen/events.c
@@ -455,6 +455,53 @@ void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
         notify_remote_via_irq(irq);
 }
 
+irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
+{
+        struct shared_info *sh = HYPERVISOR_shared_info;
+        int cpu = smp_processor_id();
+        int i;
+        unsigned long flags;
+        static DEFINE_SPINLOCK(debug_lock);
+
+        spin_lock_irqsave(&debug_lock, flags);
+
+        printk("vcpu %d\n  ", cpu);
+
+        for_each_online_cpu(i) {
+                struct vcpu_info *v = per_cpu(xen_vcpu, i);
+                printk("%d: masked=%d pending=%d event_sel %08lx\n  ", i,
+                        (get_irq_regs() && i == cpu) ? !(get_irq_regs()->flags & X86_EFLAGS_IF) : v->evtchn_upcall_mask,
+                        v->evtchn_upcall_pending,
+                        v->evtchn_pending_sel);
+        }
+        printk("pending:\n   ");
+        for(i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
+                printk("%08lx%s", sh->evtchn_pending[i],
+                        i % 8 == 0 ? "\n   " : " ");
+        printk("\nmasks:\n   ");
+        for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
+                printk("%08lx%s", sh->evtchn_mask[i],
+                        i % 8 == 0 ? "\n   " : " ");
+
+        printk("\nunmasked:\n   ");
+        for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
+                printk("%08lx%s", sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
+                        i % 8 == 0 ? "\n   " : " ");
+
+        printk("\npending list:\n");
+        for(i = 0; i < NR_EVENT_CHANNELS; i++) {
+                if (sync_test_bit(i, sh->evtchn_pending)) {
+                        printk("  %d: event %d -> irq %d\n",
+                                cpu_evtchn[i], i,
+                                evtchn_to_irq[i]);
+                }
+        }
+
+        spin_unlock_irqrestore(&debug_lock, flags);
+
+        return IRQ_HANDLED;
+}
+
 
 /*
  * Search the CPUs pending events bitmasks.  For each one found, map
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index d61e4f8b07c7..92dd3dbf3ffb 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 __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;
 }
 
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 01d4ff2ce404..22395d20dd6e 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -2,6 +2,7 @@
 #define XEN_OPS_H
 
 #include <linux/init.h>
+#include <linux/irqreturn.h>
 
 /* These are code, but not functions.  Defined in entry.S */
 extern const char xen_hypervisor_callback[];
@@ -29,6 +30,8 @@ unsigned long xen_get_wallclock(void);
 int xen_set_wallclock(unsigned long time);
 unsigned long long xen_sched_clock(void);
 
+irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
+
 bool xen_vcpu_stolen(int vcpu);
 
 void xen_mark_init_mm_pinned(void);