Commit-ID: 90adda98b89aaf68b06014ecf805b6c477daa19b
Gitweb: http://git.kernel.org/tip/90adda98b89aaf68b06014ecf805b6c477daa19b
Author: John Stultz <john.stultz@xxxxxxxxxx>
AuthorDate: Mon, 21 Jan 2013 17:00:11 -0800
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Fri, 22 Mar 2013 16:19:59 -0700
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@xxxxxxxxxx>
---
include/linux/hrtimer.h | 5 ++++-
include/linux/timekeeper_internal.h | 2 ++
kernel/hrtimer.c | 14 +++++++++++++-
kernel/posix-timers.c | 6 ++++++
kernel/time/timekeeping.c | 20 +++++++++++++++++++-
5 files changed, 44 insertions(+), 3 deletions(-)
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/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index ff94f43..26700d8 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -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;
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index cc47812..2587207 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -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);
}
/*
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index fbfc5f1..2a2e173 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -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,
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 8a84275..8061ae0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -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);
--
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