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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 15:15:40 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 15:15:40 (GMT) |
commit | ab86e974f04b1cd827a9c7c35273834ebcd9ab38 (patch) | |
tree | 41df33732d2700d6d57d1e7ab3f430942f09ffcc /include/linux | |
parent | 8700c95adb033843fc163d112b9d21d4fda78018 (diff) | |
parent | 6f7a05d7018de222e40ca003721037a530979974 (diff) | |
download | linux-fsl-qoriq-ab86e974f04b1cd827a9c7c35273834ebcd9ab38.tar.xz |
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core timer updates from Ingo Molnar:
"The main changes in this cycle's merge are:
- Implement shadow timekeeper to shorten in kernel reader side
blocking, by Thomas Gleixner.
- Posix timers enhancements by Pavel Emelyanov:
- allocate timer ID per process, so that exact timer ID allocations
can be re-created be checkpoint/restore code.
- debuggability and tooling (/proc/PID/timers, etc.) improvements.
- suspend/resume enhancements by Feng Tang: on certain new Intel Atom
processors (Penwell and Cloverview), there is a feature that the
TSC won't stop in S3 state, so the TSC value won't be reset to 0
after resume. This can be taken advantage of by the generic via
the CLOCK_SOURCE_SUSPEND_NONSTOP flag: instead of using the RTC to
recover/approximate sleep time, the main (and precise) clocksource
can be used.
- Fix /proc/timer_list for 4096 CPUs by Nathan Zimmer: on so many
CPUs the file goes beyond 4MB of size and thus the current
simplistic seqfile approach fails. Convert /proc/timer_list to a
proper seq_file with its own iterator.
- Cleanups and refactorings of the core timekeeping code by John
Stultz.
- International Atomic Clock time is managed by the NTP code
internally currently but not exposed externally. Separate the TAI
code out and add CLOCK_TAI support and TAI support to the hrtimer
and posix-timer code, by John Stultz.
- Add deep idle support enhacement to the broadcast clockevents core
timer code, by Daniel Lezcano: add an opt-in CLOCK_EVT_FEAT_DYNIRQ
clockevents feature (which will be utilized by future clockevents
driver updates), which allows the use of IRQ affinities to avoid
spurious wakeups of idle CPUs - the right CPU with an expiring
timer will be woken.
- Add new ARM bcm281xx clocksource driver, by Christian Daudt
- ... various other fixes and cleanups"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
clockevents: Set dummy handler on CPU_DEAD shutdown
timekeeping: Update tk->cycle_last in resume
posix-timers: Remove unused variable
clockevents: Switch into oneshot mode even if broadcast registered late
timer_list: Convert timer list to be a proper seq_file
timer_list: Split timer_list_show_tickdevices
posix-timers: Show sigevent info in proc file
posix-timers: Introduce /proc/PID/timers file
posix timers: Allocate timer id per process (v2)
timekeeping: Make sure to notify hrtimers when TAI offset changes
hrtimer: Fix ktime_add_ns() overflow on 32bit architectures
hrtimer: Add expiry time overflow check in hrtimer_interrupt
timekeeping: Shorten seq_count region
timekeeping: Implement a shadow timekeeper
timekeeping: Delay update of clock->cycle_last
timekeeping: Store cycle_last value in timekeeper struct as well
ntp: Remove ntp_lock, using the timekeeping locks to protect ntp state
timekeeping: Simplify tai updating from do_adjtimex
timekeeping: Hold timekeepering locks in do_adjtimex and hardpps
timekeeping: Move ADJ_SETOFFSET to top level do_adjtimex()
...
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/clockchips.h | 12 | ||||
-rw-r--r-- | include/linux/clocksource.h | 1 | ||||
-rw-r--r-- | include/linux/hrtimer.h | 5 | ||||
-rw-r--r-- | include/linux/jiffies.h | 1 | ||||
-rw-r--r-- | include/linux/posix-timers.h | 1 | ||||
-rw-r--r-- | include/linux/sched.h | 3 | ||||
-rw-r--r-- | include/linux/time.h | 3 | ||||
-rw-r--r-- | include/linux/timekeeper_internal.h | 9 | ||||
-rw-r--r-- | include/linux/timex.h | 7 |
9 files changed, 30 insertions, 12 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 6634652..464e229 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -55,6 +55,11 @@ enum clock_event_nofitiers { #define CLOCK_EVT_FEAT_C3STOP 0x000008 #define CLOCK_EVT_FEAT_DUMMY 0x000010 +/* + * Core shall set the interrupt affinity dynamically in broadcast mode + */ +#define CLOCK_EVT_FEAT_DYNIRQ 0x000020 + /** * struct clock_event_device - clock event device descriptor * @event_handler: Assigned by the framework to be called by the low @@ -170,6 +175,12 @@ extern void tick_broadcast(const struct cpumask *mask); extern int tick_receive_broadcast(void); #endif +#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) +extern int tick_check_broadcast_expired(void); +#else +static inline int tick_check_broadcast_expired(void) { return 0; } +#endif + #ifdef CONFIG_GENERIC_CLOCKEVENTS extern void clockevents_notify(unsigned long reason, void *arg); #else @@ -182,6 +193,7 @@ static inline void clockevents_suspend(void) {} static inline void clockevents_resume(void) {} #define clockevents_notify(reason, arg) do { } while (0) +static inline int tick_check_broadcast_expired(void) { return 0; } #endif diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 27cfda4..aa7032c 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -206,6 +206,7 @@ struct clocksource { #define CLOCK_SOURCE_WATCHDOG 0x10 #define CLOCK_SOURCE_VALID_FOR_HRES 0x20 #define CLOCK_SOURCE_UNSTABLE 0x40 +#define CLOCK_SOURCE_SUSPEND_NONSTOP 0x80 /* simplify initialization of mask field */ #define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1) diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index cc07d27..d19a5c2 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -157,6 +157,7 @@ enum hrtimer_base_type { HRTIMER_BASE_MONOTONIC, HRTIMER_BASE_REALTIME, HRTIMER_BASE_BOOTTIME, + HRTIMER_BASE_TAI, HRTIMER_MAX_CLOCK_BASES, }; @@ -327,7 +328,9 @@ extern ktime_t ktime_get(void); extern ktime_t ktime_get_real(void); extern ktime_t ktime_get_boottime(void); extern ktime_t ktime_get_monotonic_offset(void); -extern ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot); +extern ktime_t ktime_get_clocktai(void); +extern ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, + ktime_t *offs_tai); DECLARE_PER_CPU(struct tick_device, tick_cpu_device); diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h index 82ed068..8fb8edf 100644 --- a/include/linux/jiffies.h +++ b/include/linux/jiffies.h @@ -75,7 +75,6 @@ extern int register_refined_jiffies(long clock_tick_rate); */ extern u64 __jiffy_data jiffies_64; extern unsigned long volatile __jiffy_data jiffies; -extern seqlock_t jiffies_lock; #if (BITS_PER_LONG < 64) u64 get_jiffies_64(void); diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index 042058f..60bac69 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -55,6 +55,7 @@ struct cpu_timer_list { /* POSIX.1b interval timer structure. */ struct k_itimer { struct list_head list; /* free/ allocate list */ + struct hlist_node t_hash; spinlock_t it_lock; clockid_t it_clock; /* which timer type */ timer_t it_id; /* timer id */ diff --git a/include/linux/sched.h b/include/linux/sched.h index 981ab68..54ddcb8 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -514,7 +514,8 @@ struct signal_struct { unsigned int has_child_subreaper:1; /* POSIX.1b Interval Timers */ - struct list_head posix_timers; + int posix_timer_id; + struct list_head posix_timers; /* ITIMER_REAL timer for the process */ struct hrtimer real_timer; diff --git a/include/linux/time.h b/include/linux/time.h index d4835df..22d81b3 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -181,6 +181,9 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran); extern int timekeeping_valid_for_hres(void); extern u64 timekeeping_max_deferment(void); extern int timekeeping_inject_offset(struct timespec *ts); +extern s32 timekeeping_get_tai_offset(void); +extern void timekeeping_set_tai_offset(s32 tai_offset); +extern void timekeeping_clocktai(struct timespec *ts); struct tms; extern void do_sys_times(struct tms *); diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h index e1d558e..c1825eb 100644 --- a/include/linux/timekeeper_internal.h +++ b/include/linux/timekeeper_internal.h @@ -20,6 +20,8 @@ struct timekeeper { u32 shift; /* Number of clock cycles in one NTP interval. */ cycle_t cycle_interval; + /* Last cycle value (also stored in clock->cycle_last) */ + cycle_t cycle_last; /* Number of clock shifted nano seconds in one NTP interval. */ u64 xtime_interval; /* shifted nano seconds left over when rounding cycle_interval */ @@ -62,8 +64,11 @@ struct timekeeper { ktime_t offs_boot; /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */ struct timespec raw_time; - /* Seqlock for all timekeeper values */ - seqlock_t lock; + /* The current UTC to TAI offset in seconds */ + s32 tai_offset; + /* Offset clock monotonic -> clock tai */ + ktime_t offs_tai; + }; static inline struct timespec tk_xtime(struct timekeeper *tk) diff --git a/include/linux/timex.h b/include/linux/timex.h index 5ec87c6..b3726e6 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -125,9 +125,6 @@ extern unsigned long tick_usec; /* USER_HZ period (usec) */ extern unsigned long tick_nsec; /* SHIFTED_HZ period (nsec) */ -extern void ntp_init(void); -extern void ntp_clear(void); - /* Required to safely shift negative values */ #define shift_right(x, s) ({ \ __typeof__(x) __x = (x); \ @@ -140,10 +137,6 @@ extern void ntp_clear(void); #define NTP_INTERVAL_FREQ (HZ) #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ) -/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */ -extern u64 ntp_tick_length(void); - -extern int second_overflow(unsigned long secs); extern int do_adjtimex(struct timex *); extern void hardpps(const struct timespec *, const struct timespec *); |