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hrtimer: Add hrtimer support for CLOCK_TAI 

Add hrtimer support for CLOCK_TAI, as well as posix timer interfaces.

Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2013-01-21 17:00:11 -08:00
parent 1ff3c9677b
commit 90adda98b8
5 changed files with 44 additions and 3 deletions
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5
include/linux/hrtimer.h
View File

@ -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);

2
include/linux/timekeeper_internal.h
View File

@ -64,6 +64,8 @@ struct timekeeper {
struct timespec raw_time;
/* The current UTC to TAI offset in seconds */
s32 tai_offset;
/* Offset clock monotonic -> clock tai */
ktime_t offs_tai;
/* Seqlock for all timekeeper values */
seqlock_t lock;

14
kernel/hrtimer.c
View File

@ -83,6 +83,12 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
.get_time = &ktime_get_boottime,
.resolution = KTIME_LOW_RES,
},
{
.index = HRTIMER_BASE_TAI,
.clockid = CLOCK_TAI,
.get_time = &ktime_get_clocktai,
.resolution = KTIME_LOW_RES,
},
}
};
@ -90,6 +96,7 @@ static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
[CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
[CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
[CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
[CLOCK_TAI] = HRTIMER_BASE_TAI,
};
static inline int hrtimer_clockid_to_base(clockid_t clock_id)
@ -106,8 +113,10 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
{
ktime_t xtim, mono, boot;
struct timespec xts, tom, slp;
s32 tai_offset;
get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp);
tai_offset = timekeeping_get_tai_offset();
xtim = timespec_to_ktime(xts);
mono = ktime_add(xtim, timespec_to_ktime(tom));
@ -115,6 +124,8 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;
base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot;
base->clock_base[HRTIMER_BASE_TAI].softirq_time =
ktime_add(xtim, ktime_set(tai_offset, 0));
}
/*
@ -651,8 +662,9 @@ static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
{
ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset;
ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset;
ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset;
return ktime_get_update_offsets(offs_real, offs_boot);
return ktime_get_update_offsets(offs_real, offs_boot, offs_tai);
}
/*

6
kernel/posix-timers.c
View File

@ -269,6 +269,12 @@ static __init int init_posix_timers(void)
struct k_clock clock_tai = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_tai,
.nsleep = common_nsleep,
.nsleep_restart = hrtimer_nanosleep_restart,
.timer_create = common_timer_create,
.timer_set = common_timer_set,
.timer_get = common_timer_get,
.timer_del = common_timer_del,
};
struct k_clock clock_boottime = {
.clock_getres = hrtimer_get_res,

20
kernel/time/timekeeping.c
View File

@ -67,6 +67,7 @@ static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm)
tk->wall_to_monotonic = wtm;
set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
tk->offs_real = timespec_to_ktime(tmp);
tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0));
}
static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t)
@ -409,6 +410,20 @@ void timekeeping_clocktai(struct timespec *ts)
EXPORT_SYMBOL(timekeeping_clocktai);
/**
* ktime_get_clocktai - Returns the TAI time of day in a ktime
*
* Returns the time of day in a ktime.
*/
ktime_t ktime_get_clocktai(void)
{
struct timespec ts;
timekeeping_clocktai(&ts);
return timespec_to_ktime(ts);
}
EXPORT_SYMBOL(ktime_get_clocktai);
#ifdef CONFIG_NTP_PPS
/**
@ -569,6 +584,7 @@ s32 timekeeping_get_tai_offset(void)
void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset)
{
tk->tai_offset = tai_offset;
tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0));
}
/**
@ -1539,7 +1555,8 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
* Returns current monotonic time and updates the offsets
* Called from hrtimer_interupt() or retrigger_next_event()
*/
ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)
ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot,
ktime_t *offs_tai)
{
struct timekeeper *tk = &timekeeper;
ktime_t now;
@ -1554,6 +1571,7 @@ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)
*offs_real = tk->offs_real;
*offs_boot = tk->offs_boot;
*offs_tai = tk->offs_tai;
} while (read_seqretry(&tk->lock, seq));
now = ktime_add_ns(ktime_set(secs, 0), nsecs);