[Xen-devel] [RFC 7/8] x86/hpet: debug keyhandlers

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Debug key for dumping HPET state.
---
 xen/arch/x86/hpet.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/xen/arch/x86/hpet.c b/xen/arch/x86/hpet.c
index e8a3f66..c5468fa 100644
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -22,6 +22,8 @@
 #define MAX_DELTA_NS MILLISECS(10*1000)
 #define MIN_DELTA_NS MICROSECS(20)
 
+#include <xen/keyhandler.h>
+
 #define HPET_EVT_USED_BIT    0
 #define HPET_EVT_USED       (1 << HPET_EVT_USED_BIT)
 #define HPET_EVT_DISABLE_BIT 1
@@ -822,6 +824,21 @@ int hpet_legacy_irq_tick(void)
     return 1;
 }
 
+static void do_hpet_dump_state(unsigned char key)
+{
+    unsigned i;
+    printk("'%c' pressed - dumping HPET state\n", key);
+
+    for ( i = 0; i < num_hpets_used; ++i )
+        dump_hpet_timer(i);
+}
+
+static struct keyhandler hpet_dump_state = {
+    .irq_callback = 0,
+    .u.fn = do_hpet_dump_state,
+    .desc = "Dump hpet state"
+};
+
 u64 __init hpet_setup(void)
 {
     static u64 __initdata hpet_rate;
@@ -879,6 +896,8 @@ u64 __init hpet_setup(void)
     hpet_rate = 1000000000000000ULL; /* 10^15 */
     (void)do_div(hpet_rate, hpet_period);
 
+    register_keyhandler('1', &hpet_dump_state);
+
     return hpet_rate;
 }
 
-- 
1.7.10.4


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