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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-18 09:15:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-18 09:15:24 -0700
commita03fdb7612874834d6847107198712d18b5242c7 (patch)
tree9ae81170509fd8b1c23d1b7e8edfa7a2203ffce3 /include/linux
parent202c4675c55ddf6b443c7e057d2dff6b42ef71aa (diff)
parent12e09337fe238981cb0c87543306e23775d1a143 (diff)
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (34 commits) time: Prevent 32 bit overflow with set_normalized_timespec() clocksource: Delay clocksource down rating to late boot clocksource: clocksource_select must be called with mutex locked clocksource: Resolve cpu hotplug dead lock with TSC unstable, fix crash timers: Drop a function prototype clocksource: Resolve cpu hotplug dead lock with TSC unstable timer.c: Fix S/390 comments timekeeping: Fix invalid getboottime() value timekeeping: Fix up read_persistent_clock() breakage on sh timekeeping: Increase granularity of read_persistent_clock(), build fix time: Introduce CLOCK_REALTIME_COARSE x86: Do not unregister PIT clocksource on PIT oneshot setup/shutdown clocksource: Avoid clocksource watchdog circular locking dependency clocksource: Protect the watchdog rating changes with clocksource_mutex clocksource: Call clocksource_change_rating() outside of watchdog_lock timekeeping: Introduce read_boot_clock timekeeping: Increase granularity of read_persistent_clock() timekeeping: Update clocksource with stop_machine timekeeping: Add timekeeper read_clock helper functions timekeeping: Move NTP adjusted clock multiplier to struct timekeeper ... Fix trivial conflict due to MIPS lemote -> loongson renaming.
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/clocksource.h122
-rw-r--r--include/linux/hrtimer.h2
-rw-r--r--include/linux/time.h10
-rw-r--r--include/linux/timer.h5
4 files changed, 19 insertions, 120 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1219be4fb42..83d2fbd81b9 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -14,6 +14,7 @@
#include <linux/list.h>
#include <linux/cache.h>
#include <linux/timer.h>
+#include <linux/init.h>
#include <asm/div64.h>
#include <asm/io.h>
@@ -148,14 +149,11 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
* @disable: optional function to disable the clocksource
* @mask: bitmask for two's complement
* subtraction of non 64 bit counters
- * @mult: cycle to nanosecond multiplier (adjusted by NTP)
- * @mult_orig: cycle to nanosecond multiplier (unadjusted by NTP)
+ * @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
* @flags: flags describing special properties
* @vread: vsyscall based read
* @resume: resume function for the clocksource, if necessary
- * @cycle_interval: Used internally by timekeeping core, please ignore.
- * @xtime_interval: Used internally by timekeeping core, please ignore.
*/
struct clocksource {
/*
@@ -169,7 +167,6 @@ struct clocksource {
void (*disable)(struct clocksource *cs);
cycle_t mask;
u32 mult;
- u32 mult_orig;
u32 shift;
unsigned long flags;
cycle_t (*vread)(void);
@@ -181,19 +178,12 @@ struct clocksource {
#define CLKSRC_FSYS_MMIO_SET(mmio, addr) do { } while (0)
#endif
- /* timekeeping specific data, ignore */
- cycle_t cycle_interval;
- u64 xtime_interval;
- u32 raw_interval;
/*
* Second part is written at each timer interrupt
* Keep it in a different cache line to dirty no
* more than one cache line.
*/
cycle_t cycle_last ____cacheline_aligned_in_smp;
- u64 xtime_nsec;
- s64 error;
- struct timespec raw_time;
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
/* Watchdog related data, used by the framework */
@@ -202,8 +192,6 @@ struct clocksource {
#endif
};
-extern struct clocksource *clock; /* current clocksource */
-
/*
* Clock source flags bits::
*/
@@ -212,6 +200,7 @@ extern struct clocksource *clock; /* current clocksource */
#define CLOCK_SOURCE_WATCHDOG 0x10
#define CLOCK_SOURCE_VALID_FOR_HRES 0x20
+#define CLOCK_SOURCE_UNSTABLE 0x40
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
@@ -268,108 +257,15 @@ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
}
/**
- * clocksource_read: - Access the clocksource's current cycle value
- * @cs: pointer to clocksource being read
- *
- * Uses the clocksource to return the current cycle_t value
- */
-static inline cycle_t clocksource_read(struct clocksource *cs)
-{
- return cs->read(cs);
-}
-
-/**
- * clocksource_enable: - enable clocksource
- * @cs: pointer to clocksource
- *
- * Enables the specified clocksource. The clocksource callback
- * function should start up the hardware and setup mult and field
- * members of struct clocksource to reflect hardware capabilities.
- */
-static inline int clocksource_enable(struct clocksource *cs)
-{
- int ret = 0;
-
- if (cs->enable)
- ret = cs->enable(cs);
-
- /*
- * The frequency may have changed while the clocksource
- * was disabled. If so the code in ->enable() must update
- * the mult value to reflect the new frequency. Make sure
- * mult_orig follows this change.
- */
- cs->mult_orig = cs->mult;
-
- return ret;
-}
-
-/**
- * clocksource_disable: - disable clocksource
- * @cs: pointer to clocksource
- *
- * Disables the specified clocksource. The clocksource callback
- * function should power down the now unused hardware block to
- * save power.
- */
-static inline void clocksource_disable(struct clocksource *cs)
-{
- /*
- * Save mult_orig in mult so clocksource_enable() can
- * restore the value regardless if ->enable() updates
- * the value of mult or not.
- */
- cs->mult = cs->mult_orig;
-
- if (cs->disable)
- cs->disable(cs);
-}
-
-/**
- * cyc2ns - converts clocksource cycles to nanoseconds
- * @cs: Pointer to clocksource
- * @cycles: Cycles
+ * clocksource_cyc2ns - converts clocksource cycles to nanoseconds
*
- * Uses the clocksource and ntp ajdustment to convert cycle_ts to nanoseconds.
+ * Converts cycles to nanoseconds, using the given mult and shift.
*
* XXX - This could use some mult_lxl_ll() asm optimization
*/
-static inline s64 cyc2ns(struct clocksource *cs, cycle_t cycles)
-{
- u64 ret = (u64)cycles;
- ret = (ret * cs->mult) >> cs->shift;
- return ret;
-}
-
-/**
- * clocksource_calculate_interval - Calculates a clocksource interval struct
- *
- * @c: Pointer to clocksource.
- * @length_nsec: Desired interval length in nanoseconds.
- *
- * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment
- * pair and interval request.
- *
- * Unless you're the timekeeping code, you should not be using this!
- */
-static inline void clocksource_calculate_interval(struct clocksource *c,
- unsigned long length_nsec)
+static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift)
{
- u64 tmp;
-
- /* Do the ns -> cycle conversion first, using original mult */
- tmp = length_nsec;
- tmp <<= c->shift;
- tmp += c->mult_orig/2;
- do_div(tmp, c->mult_orig);
-
- c->cycle_interval = (cycle_t)tmp;
- if (c->cycle_interval == 0)
- c->cycle_interval = 1;
-
- /* Go back from cycles -> shifted ns, this time use ntp adjused mult */
- c->xtime_interval = (u64)c->cycle_interval * c->mult;
- c->raw_interval = ((u64)c->cycle_interval * c->mult_orig) >> c->shift;
+ return ((u64) cycles * mult) >> shift;
}
@@ -380,6 +276,8 @@ extern void clocksource_touch_watchdog(void);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_resume(void);
+extern struct clocksource * __init __weak clocksource_default_clock(void);
+extern void clocksource_mark_unstable(struct clocksource *cs);
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
@@ -394,4 +292,6 @@ static inline void update_vsyscall_tz(void)
}
#endif
+extern void timekeeping_notify(struct clocksource *clock);
+
#endif /* _LINUX_CLOCKSOURCE_H */
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 4759917adc7..ff037f0b1b4 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -91,7 +91,6 @@ enum hrtimer_restart {
* @function: timer expiry callback function
* @base: pointer to the timer base (per cpu and per clock)
* @state: state information (See bit values above)
- * @cb_entry: list head to enqueue an expired timer into the callback list
* @start_site: timer statistics field to store the site where the timer
* was started
* @start_comm: timer statistics field to store the name of the process which
@@ -108,7 +107,6 @@ struct hrtimer {
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
unsigned long state;
- struct list_head cb_entry;
#ifdef CONFIG_TIMER_STATS
int start_pid;
void *start_site;
diff --git a/include/linux/time.h b/include/linux/time.h
index ea16c1a01d5..56787c09334 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -75,7 +75,7 @@ extern unsigned long mktime(const unsigned int year, const unsigned int mon,
const unsigned int day, const unsigned int hour,
const unsigned int min, const unsigned int sec);
-extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
+extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
extern struct timespec timespec_add_safe(const struct timespec lhs,
const struct timespec rhs);
@@ -101,7 +101,8 @@ extern struct timespec xtime;
extern struct timespec wall_to_monotonic;
extern seqlock_t xtime_lock;
-extern unsigned long read_persistent_clock(void);
+extern void read_persistent_clock(struct timespec *ts);
+extern void read_boot_clock(struct timespec *ts);
extern int update_persistent_clock(struct timespec now);
extern int no_sync_cmos_clock __read_mostly;
void timekeeping_init(void);
@@ -109,6 +110,8 @@ extern int timekeeping_suspended;
unsigned long get_seconds(void);
struct timespec current_kernel_time(void);
+struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
+struct timespec get_monotonic_coarse(void);
#define CURRENT_TIME (current_kernel_time())
#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
@@ -147,6 +150,7 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
extern void update_wall_time(void);
extern void update_xtime_cache(u64 nsec);
+extern void timekeeping_leap_insert(int leapsecond);
struct tms;
extern void do_sys_times(struct tms *);
@@ -241,6 +245,8 @@ struct itimerval {
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID 3
#define CLOCK_MONOTONIC_RAW 4
+#define CLOCK_REALTIME_COARSE 5
+#define CLOCK_MONOTONIC_COARSE 6
/*
* The IDs of various hardware clocks:
diff --git a/include/linux/timer.h b/include/linux/timer.h
index be62ec2ebea..a2d1eb6cb3f 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -175,11 +175,6 @@ extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
/*
* Return when the next timer-wheel timeout occurs (in absolute jiffies),
- * locks the timer base:
- */
-extern unsigned long next_timer_interrupt(void);
-/*
- * Return when the next timer-wheel timeout occurs (in absolute jiffies),
* locks the timer base and does the comparison against the given
* jiffie.
*/