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Diffstat (limited to 'arch/powerpc/kernel/time.c')
-rw-r--r--arch/powerpc/kernel/time.c86
1 files changed, 55 insertions, 31 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index eae4511ceea..92dc844299b 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -53,7 +53,7 @@
#include <linux/posix-timers.h>
#include <linux/irq.h>
#include <linux/delay.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
#include <asm/io.h>
#include <asm/processor.h>
@@ -193,6 +193,8 @@ EXPORT_SYMBOL(__cputime_clockt_factor);
DEFINE_PER_CPU(unsigned long, cputime_last_delta);
DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
+cputime_t cputime_one_jiffy;
+
static void calc_cputime_factors(void)
{
struct div_result res;
@@ -479,7 +481,8 @@ static int __init iSeries_tb_recal(void)
unsigned long tb_ticks = tb - iSeries_recal_tb;
unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12;
unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec;
- unsigned long new_tb_ticks_per_jiffy = (new_tb_ticks_per_sec+(HZ/2))/HZ;
+ unsigned long new_tb_ticks_per_jiffy =
+ DIV_ROUND_CLOSEST(new_tb_ticks_per_sec, HZ);
long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy;
char sign = '+';
/* make sure tb_ticks_per_sec and tb_ticks_per_jiffy are consistent */
@@ -500,6 +503,7 @@ static int __init iSeries_tb_recal(void)
tb_to_xs = divres.result_low;
vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
vdso_data->tb_to_xs = tb_to_xs;
+ setup_cputime_one_jiffy();
}
else {
printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
@@ -526,25 +530,25 @@ void __init iSeries_time_init_early(void)
}
#endif /* CONFIG_PPC_ISERIES */
-#if defined(CONFIG_PERF_COUNTERS) && defined(CONFIG_PPC32)
-DEFINE_PER_CPU(u8, perf_counter_pending);
+#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_PPC32)
+DEFINE_PER_CPU(u8, perf_event_pending);
-void set_perf_counter_pending(void)
+void set_perf_event_pending(void)
{
- get_cpu_var(perf_counter_pending) = 1;
+ get_cpu_var(perf_event_pending) = 1;
set_dec(1);
- put_cpu_var(perf_counter_pending);
+ put_cpu_var(perf_event_pending);
}
-#define test_perf_counter_pending() __get_cpu_var(perf_counter_pending)
-#define clear_perf_counter_pending() __get_cpu_var(perf_counter_pending) = 0
+#define test_perf_event_pending() __get_cpu_var(perf_event_pending)
+#define clear_perf_event_pending() __get_cpu_var(perf_event_pending) = 0
-#else /* CONFIG_PERF_COUNTERS && CONFIG_PPC32 */
+#else /* CONFIG_PERF_EVENTS && CONFIG_PPC32 */
-#define test_perf_counter_pending() 0
-#define clear_perf_counter_pending()
+#define test_perf_event_pending() 0
+#define clear_perf_event_pending()
-#endif /* CONFIG_PERF_COUNTERS && CONFIG_PPC32 */
+#endif /* CONFIG_PERF_EVENTS && CONFIG_PPC32 */
/*
* For iSeries shared processors, we have to let the hypervisor
@@ -572,9 +576,9 @@ void timer_interrupt(struct pt_regs * regs)
set_dec(DECREMENTER_MAX);
#ifdef CONFIG_PPC32
- if (test_perf_counter_pending()) {
- clear_perf_counter_pending();
- perf_counter_do_pending();
+ if (test_perf_event_pending()) {
+ clear_perf_event_pending();
+ perf_event_do_pending();
}
if (atomic_read(&ppc_n_lost_interrupts) != 0)
do_IRQ(regs);
@@ -726,6 +730,18 @@ static int __init get_freq(char *name, int cells, unsigned long *val)
return found;
}
+/* should become __cpuinit when secondary_cpu_time_init also is */
+void start_cpu_decrementer(void)
+{
+#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
+ /* Clear any pending timer interrupts */
+ mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
+
+ /* Enable decrementer interrupt */
+ mtspr(SPRN_TCR, TCR_DIE);
+#endif /* defined(CONFIG_BOOKE) || defined(CONFIG_40x) */
+}
+
void __init generic_calibrate_decr(void)
{
ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */
@@ -745,14 +761,6 @@ void __init generic_calibrate_decr(void)
printk(KERN_ERR "WARNING: Estimating processor frequency "
"(not found)\n");
}
-
-#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
- /* Clear any pending timer interrupts */
- mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
-
- /* Enable decrementer interrupt */
- mtspr(SPRN_TCR, TCR_DIE);
-#endif
}
int update_persistent_clock(struct timespec now)
@@ -769,11 +777,12 @@ int update_persistent_clock(struct timespec now)
return ppc_md.set_rtc_time(&tm);
}
-unsigned long read_persistent_clock(void)
+void read_persistent_clock(struct timespec *ts)
{
struct rtc_time tm;
static int first = 1;
+ ts->tv_nsec = 0;
/* XXX this is a litle fragile but will work okay in the short term */
if (first) {
first = 0;
@@ -781,14 +790,18 @@ unsigned long read_persistent_clock(void)
timezone_offset = ppc_md.time_init();
/* get_boot_time() isn't guaranteed to be safe to call late */
- if (ppc_md.get_boot_time)
- return ppc_md.get_boot_time() -timezone_offset;
+ if (ppc_md.get_boot_time) {
+ ts->tv_sec = ppc_md.get_boot_time() - timezone_offset;
+ return;
+ }
+ }
+ if (!ppc_md.get_rtc_time) {
+ ts->tv_sec = 0;
+ return;
}
- if (!ppc_md.get_rtc_time)
- return 0;
ppc_md.get_rtc_time(&tm);
- return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
- tm.tm_hour, tm.tm_min, tm.tm_sec);
+ ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec);
}
/* clocksource code */
@@ -913,6 +926,11 @@ static void __init init_decrementer_clockevent(void)
void secondary_cpu_time_init(void)
{
+ /* Start the decrementer on CPUs that have manual control
+ * such as BookE
+ */
+ start_cpu_decrementer();
+
/* FIME: Should make unrelatred change to move snapshot_timebase
* call here ! */
register_decrementer_clockevent(smp_processor_id());
@@ -945,6 +963,7 @@ void __init time_init(void)
tb_ticks_per_usec = ppc_tb_freq / 1000000;
tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
calc_cputime_factors();
+ setup_cputime_one_jiffy();
/*
* Calculate the length of each tick in ns. It will not be
@@ -1016,6 +1035,11 @@ void __init time_init(void)
write_sequnlock_irqrestore(&xtime_lock, flags);
+ /* Start the decrementer on CPUs that have manual control
+ * such as BookE
+ */
+ start_cpu_decrementer();
+
/* Register the clocksource, if we're not running on iSeries */
if (!firmware_has_feature(FW_FEATURE_ISERIES))
clocksource_init();