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time: Add timerkeeper::tkr_raw 

Introduce tkr_raw and make use of it.

  base_raw -> tkr_raw.base
  clock->{mult,shift} -> tkr_raw.{mult.shift}

Kill timekeeping_get_ns_raw() in favour of
timekeeping_get_ns(&tkr_raw), this removes all mono_raw special
casing.

Duplicate the updates to tkr_mono.cycle_last into tkr_raw.cycle_last,
both need the same value.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150319093400.422589590@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-03-19 09:28:44 +01:00 committed by Ingo Molnar
parent 876e78818d
commit 4a4ad80d32
2 changed files with 21 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/timekeeper_internal.h
View File

@ -41,6 +41,7 @@ struct tk_read_base {
/**
* struct timekeeper - Structure holding internal timekeeping values.
* @tkr_mono: The readout base structure for CLOCK_MONOTONIC
* @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW
* @xtime_sec: Current CLOCK_REALTIME time in seconds
* @ktime_sec: Current CLOCK_MONOTONIC time in seconds
* @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset
@ -48,7 +49,6 @@ struct tk_read_base {
* @offs_boot: Offset clock monotonic -> clock boottime
* @offs_tai: Offset clock monotonic -> clock tai
* @tai_offset: The current UTC to TAI offset in seconds
* @base_raw: Monotonic raw base time in ktime_t format
* @raw_time: Monotonic raw base time in timespec64 format
* @cycle_interval: Number of clock cycles in one NTP interval
* @xtime_interval: Number of clock shifted nano seconds in one NTP
@ -77,6 +77,7 @@ struct tk_read_base {
*/
struct timekeeper {
struct tk_read_base tkr_mono;
struct tk_read_base tkr_raw;
u64 xtime_sec;
unsigned long ktime_sec;
struct timespec64 wall_to_monotonic;
@ -84,7 +85,6 @@ struct timekeeper {
ktime_t offs_boot;
ktime_t offs_tai;
s32 tai_offset;
ktime_t base_raw;
struct timespec64 raw_time;
/* The following members are for timekeeping internal use */

41
kernel/time/timekeeping.c
View File

@ -252,6 +252,11 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
tk->tkr_mono.mask = clock->mask;
tk->tkr_mono.cycle_last = tk->tkr_mono.read(clock);
tk->tkr_raw.clock = clock;
tk->tkr_raw.read = clock->read;
tk->tkr_raw.mask = clock->mask;
tk->tkr_raw.cycle_last = tk->tkr_mono.cycle_last;
/* Do the ns -> cycle conversion first, using original mult */
tmp = NTP_INTERVAL_LENGTH;
tmp <<= clock->shift;
@ -278,7 +283,10 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
else
tk->tkr_mono.xtime_nsec <<= shift_change;
}
tk->tkr_raw.xtime_nsec = 0;
tk->tkr_mono.shift = clock->shift;
tk->tkr_raw.shift = clock->shift;
tk->ntp_error = 0;
tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift;
@ -290,6 +298,7 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
* to counteract clock drifting.
*/
tk->tkr_mono.mult = clock->mult;
tk->tkr_raw.mult = clock->mult;
tk->ntp_err_mult = 0;
}
@ -316,21 +325,6 @@ static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
return nsec + arch_gettimeoffset();
}
static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
{
struct clocksource *clock = tk->tkr_mono.clock;
cycle_t delta;
s64 nsec;
delta = timekeeping_get_delta(&tk->tkr_mono);
/* convert delta to nanoseconds. */
nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift);
/* If arch requires, add in get_arch_timeoffset() */
return nsec + arch_gettimeoffset();
}
/**
* update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper.
* @tkr: Timekeeping readout base from which we take the update
@ -562,7 +556,7 @@ static inline void tk_update_ktime_data(struct timekeeper *tk)
tk->tkr_mono.base = ns_to_ktime(seconds * NSEC_PER_SEC + nsec);
/* Update the monotonic raw base */
tk->base_raw = timespec64_to_ktime(tk->raw_time);
tk->tkr_raw.base = timespec64_to_ktime(tk->raw_time);
/*
* The sum of the nanoseconds portions of xtime and
@ -611,6 +605,7 @@ static void timekeeping_forward_now(struct timekeeper *tk)
cycle_now = tk->tkr_mono.read(clock);
delta = clocksource_delta(cycle_now, tk->tkr_mono.cycle_last, tk->tkr_mono.mask);
tk->tkr_mono.cycle_last = cycle_now;
tk->tkr_raw.cycle_last = cycle_now;
tk->tkr_mono.xtime_nsec += delta * tk->tkr_mono.mult;
@ -619,7 +614,7 @@ static void timekeeping_forward_now(struct timekeeper *tk)
tk_normalize_xtime(tk);
nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift);
nsec = clocksource_cyc2ns(delta, tk->tkr_raw.mult, tk->tkr_raw.shift);
timespec64_add_ns(&tk->raw_time, nsec);
}
@ -748,8 +743,8 @@ ktime_t ktime_get_raw(void)
do {
seq = read_seqcount_begin(&tk_core.seq);
base = tk->base_raw;
nsecs = timekeeping_get_ns_raw(tk);
base = tk->tkr_raw.base;
nsecs = timekeeping_get_ns(&tk->tkr_raw);
} while (read_seqcount_retry(&tk_core.seq, seq));
@ -862,7 +857,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
ts_real->tv_sec = tk->xtime_sec;
ts_real->tv_nsec = 0;
nsecs_raw = timekeeping_get_ns_raw(tk);
nsecs_raw = timekeeping_get_ns(&tk->tkr_raw);
nsecs_real = timekeeping_get_ns(&tk->tkr_mono);
} while (read_seqcount_retry(&tk_core.seq, seq));
@ -1096,7 +1091,7 @@ void getrawmonotonic64(struct timespec64 *ts)
do {
seq = read_seqcount_begin(&tk_core.seq);
nsecs = timekeeping_get_ns_raw(tk);
nsecs = timekeeping_get_ns(&tk->tkr_raw);
ts64 = tk->raw_time;
} while (read_seqcount_retry(&tk_core.seq, seq));
@ -1217,7 +1212,6 @@ void __init timekeeping_init(void)
tk_set_xtime(tk, &now);
tk->raw_time.tv_sec = 0;
tk->raw_time.tv_nsec = 0;
tk->base_raw.tv64 = 0;
if (boot.tv_sec == 0 && boot.tv_nsec == 0)
boot = tk_xtime(tk);
@ -1367,6 +1361,8 @@ void timekeeping_resume(void)
/* Re-base the last cycle value */
tk->tkr_mono.cycle_last = cycle_now;
tk->tkr_raw.cycle_last = cycle_now;
tk->ntp_error = 0;
timekeeping_suspended = 0;
timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
@ -1681,6 +1677,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
/* Accumulate one shifted interval */
offset -= interval;
tk->tkr_mono.cycle_last += interval;
tk->tkr_raw.cycle_last += interval;
tk->tkr_mono.xtime_nsec += tk->xtime_interval << shift;
*clock_set |= accumulate_nsecs_to_secs(tk);