Merge to Fedora kernel-2.6.18-1.2224_FC5 patched with stable patch-2.6.18.1-vs2.0...

[linux-2.6.git] / arch / ia64 / kernel / time.c

diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 853d8da..6928ef0 100644 (file)
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -8,7 +8,6 @@
  * Copyright (C) 1999-2000 VA Linux Systems
  * Copyright (C) 1999-2000 Walt Drummond <drummond@valinux.com>
  */
-#include <linux/config.h>
 
 #include <linux/cpu.h>
 #include <linux/init.h>
@@ -32,11 +31,7 @@
 
 extern unsigned long wall_jiffies;
 
-u64 jiffies_64 = INITIAL_JIFFIES;
-
-EXPORT_SYMBOL(jiffies_64);
-
-#define TIME_KEEPER_ID 0       /* smp_processor_id() of time-keeper */
+volatile int time_keeper_id = 0; /* smp_processor_id() of time-keeper */
 
 #ifdef CONFIG_IA64_DEBUG_IRQ
 
@@ -45,7 +40,11 @@ EXPORT_SYMBOL(last_cli_ip);
 
 #endif
 
-static struct time_interpolator itc_interpolator;
+static struct time_interpolator itc_interpolator = {
+       .shift = 16,
+       .mask = 0xffffffffffffffffLL,
+       .source = TIME_SOURCE_CPU
+};
 
 static irqreturn_t
 timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
@@ -67,17 +66,11 @@ timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
        profile_tick(CPU_PROFILING, regs);
 
        while (1) {
-#ifdef CONFIG_SMP
-               /*
-                * For UP, this is done in do_timer().  Weird, but
-                * fixing that would require updates to all
-                * platforms.
-                */
                update_process_times(user_mode(regs));
-#endif
+
                new_itm += local_cpu_data->itm_delta;
 
-               if (smp_processor_id() == TIME_KEEPER_ID) {
+               if (smp_processor_id() == time_keeper_id) {
                        /*
                         * Here we are in the timer irq handler. We have irqs locally
                         * disabled, but we don't know if the timer_bh is running on
@@ -192,17 +185,20 @@ ia64_init_itm (void)
                itc_ratio.den = 1;      /* avoid division by zero */
 
        itc_freq = (platform_base_freq*itc_ratio.num)/itc_ratio.den;
-       if (platform_base_drift != -1)
-               itc_drift = platform_base_drift*itc_ratio.num/itc_ratio.den;
-       else
-               itc_drift = -1;
 
        local_cpu_data->itm_delta = (itc_freq + HZ/2) / HZ;
-       printk(KERN_DEBUG "CPU %d: base freq=%lu.%03luMHz, ITC ratio=%lu/%lu, "
-              "ITC freq=%lu.%03luMHz+/-%ldppm\n", smp_processor_id(),
+       printk(KERN_DEBUG "CPU %d: base freq=%lu.%03luMHz, ITC ratio=%u/%u, "
+              "ITC freq=%lu.%03luMHz", smp_processor_id(),
               platform_base_freq / 1000000, (platform_base_freq / 1000) % 1000,
-              itc_ratio.num, itc_ratio.den, itc_freq / 1000000, (itc_freq / 1000) % 1000,
-              itc_drift);
+              itc_ratio.num, itc_ratio.den, itc_freq / 1000000, (itc_freq / 1000) % 1000);
+
+       if (platform_base_drift != -1) {
+               itc_drift = platform_base_drift*itc_ratio.num/itc_ratio.den;
+               printk("+/-%ldppm\n", itc_drift);
+       } else {
+               itc_drift = -1;
+               printk("\n");
+       }
 
        local_cpu_data->proc_freq = (platform_base_freq*proc_ratio.num)/proc_ratio.den;
        local_cpu_data->itc_freq = itc_freq;
@@ -212,9 +208,7 @@ ia64_init_itm (void)
 
        if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {
                itc_interpolator.frequency = local_cpu_data->itc_freq;
-               itc_interpolator.shift = 16;
                itc_interpolator.drift = itc_drift;
-               itc_interpolator.source = TIME_SOURCE_CPU;
 #ifdef CONFIG_SMP
                /* On IA64 in an SMP configuration ITCs are never accurately synchronized.
                 * Jitter compensation requires a cmpxchg which may limit
@@ -228,7 +222,6 @@ ia64_init_itm (void)
                 */
                if (!nojitter) itc_interpolator.jitter = 1;
 #endif
-               itc_interpolator.addr = NULL;
                register_time_interpolator(&itc_interpolator);
        }
 
@@ -238,10 +231,15 @@ ia64_init_itm (void)
 
 static struct irqaction timer_irqaction = {
        .handler =      timer_interrupt,
-       .flags =        SA_INTERRUPT,
+       .flags =        IRQF_DISABLED,
        .name =         "timer"
 };
 
+void __devinit ia64_disable_timer(void)
+{
+       ia64_set_itv(1 << 16);
+}
+
 void __init
 time_init (void)
 {
@@ -255,3 +253,54 @@ time_init (void)
         */
        set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec);
 }
+
+/*
+ * Generic udelay assumes that if preemption is allowed and the thread
+ * migrates to another CPU, that the ITC values are synchronized across
+ * all CPUs.
+ */
+static void
+ia64_itc_udelay (unsigned long usecs)
+{
+       unsigned long start = ia64_get_itc();
+       unsigned long end = start + usecs*local_cpu_data->cyc_per_usec;
+
+       while (time_before(ia64_get_itc(), end))
+               cpu_relax();
+}
+
+void (*ia64_udelay)(unsigned long usecs) = &ia64_itc_udelay;
+
+void
+udelay (unsigned long usecs)
+{
+       (*ia64_udelay)(usecs);
+}
+EXPORT_SYMBOL(udelay);
+
+static unsigned long long ia64_itc_printk_clock(void)
+{
+       if (ia64_get_kr(IA64_KR_PER_CPU_DATA))
+               return sched_clock();
+       return 0;
+}
+
+static unsigned long long ia64_default_printk_clock(void)
+{
+       return (unsigned long long)(jiffies_64 - INITIAL_JIFFIES) *
+               (1000000000/HZ);
+}
+
+unsigned long long (*ia64_printk_clock)(void) = &ia64_default_printk_clock;
+
+unsigned long long printk_clock(void)
+{
+       return ia64_printk_clock();
+}
+
+void __init
+ia64_setup_printk_clock(void)
+{
+       if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT))
+               ia64_printk_clock = ia64_itc_printk_clock;
+}