[PATCH RFC 3/6] x86/time: streamline platform time init on plt_init()

[Joao Martins <joao.m.martins@oracle.com>]

And use to initialize platform time solely for clocksource=tsc,
as opposed to initializing platform overflow timer, which would
only fire in ~180 years (on 2.2 Ghz Broadwell processor).

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 xen/arch/x86/time.c | 41 +++++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index c9e5c14..df42d31 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -518,17 +518,31 @@ static s_time_t __read_platform_stime(u64 platform_time)
     return (stime_platform_stamp + scale_delta(diff, &plt_scale));
 }
 
+static void __plt_init(void)
+{
+    u64 count;
+
+    ASSERT(spin_is_locked(&platform_timer_lock));
+    count = plt_src.read_counter();
+    plt_stamp64 += (count - plt_stamp) & plt_mask;
+    plt_stamp = count;
+}
+
+static void plt_init(void)
+{
+    spin_lock_irq(&platform_timer_lock);
+    __plt_init();
+    spin_unlock_irq(&platform_timer_lock);
+}
+
 static void plt_overflow(void *unused)
 {
     int i;
-    u64 count;
     s_time_t now, plt_now, plt_wrap;
 
     spin_lock_irq(&platform_timer_lock);
 
-    count = plt_src.read_counter();
-    plt_stamp64 += (count - plt_stamp) & plt_mask;
-    plt_stamp = count;
+    __plt_init();
 
     now = NOW();
     plt_wrap = __read_platform_stime(plt_stamp64);
@@ -635,11 +649,22 @@ static void __init init_platform_timer(void)
 
     set_time_scale(&plt_scale, pts->frequency);
 
-    plt_overflow_period = scale_delta(
-        1ull << (pts->counter_bits-1), &plt_scale);
-    init_timer(&plt_overflow_timer, plt_overflow, NULL, 0);
     plt_src = *pts;
-    plt_overflow(NULL);
+
+    if ( clocksource_is_tsc )
+    {
+        plt_init();
+    }
+    else
+    {
+        plt_overflow_period = scale_delta(
+            1ull << (pts->counter_bits-1), &plt_scale);
+        init_timer(&plt_overflow_timer, plt_overflow, NULL, 0);
+        plt_overflow(NULL);
+
+        printk("Platform timer overflow period is %lu secs\n",
+               plt_overflow_period/1000000000);
+    }
 
     platform_timer_stamp = plt_stamp64;
     stime_platform_stamp = NOW();
-- 
2.1.4