linux-toradex.git/include/linux/clockchips.h, branch v4.6-rc3

clockevents: Rename last parameter of clocks_calc_mult_shift() to maxsec

2016-01-27T11:38:03+00:00

Last parameter of the clocks_calc_mult_shift() was renamed from minsec to
maxsec in the 5fdade95 (time: Rename misnamed minsec argument of
clocks_calc_mult_shift()).

Signed-off-by: Alexander Kuleshov 
Link: http://lkml.kernel.org/r/1444987253-11018-1-git-send-email-kuleshovmail@gmail.com
Signed-off-by: Thomas Gleixner

clockevents: Remove unused set_mode() callback

2015-09-14T09:00:55+00:00

All users are migrated to the per-state callbacks, get rid of the
unused interface and the core support code.

Signed-off-by: Viresh Kumar 
Signed-off-by: Thomas Gleixner 
Cc: linaro-kernel@lists.linaro.org
Cc: John Stultz 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/fd60de14cf6d125489c031207567bb255ad946f6.1441943991.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar

clockevents: Remove clockevents_notify() prototype

2015-07-20T09:37:46+00:00

This function no longer exists after commit a49b116dcb12
(clockevents: Cleanup dead cpu explicitely, 2015-04-03). Remove
the prototype and the stub function.

Signed-off-by: Stephen Boyd 
Cc: trivial@kernel.org
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1436984500-5425-1-git-send-email-sboyd@codeaurora.org
Signed-off-by: Thomas Gleixner

clockevents: Rename state to state_use_accessors

2015-06-02T14:56:42+00:00

The only sensible way to make abuse of core internal fields obvious
and easy to grep for.

Signed-off-by: Thomas Gleixner 
Cc: Viresh Kumar 
Cc: Peter Zijlstra

clockevents: Add helpers to check the state of a clockevent device

2015-06-02T12:40:47+00:00

Some clockevent drivers, once migrated to use per-state callbacks,
need to check the state of the clockevent device in their callbacks or
interrupt handler.

Add accessor functions clockevent_state_*() to get this information.

Signed-off-by: Viresh Kumar 
Cc: linaro-kernel@lists.linaro.org
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/04a717d490335c688dd7af899fbcede97e1bb8ee.1432192527.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner

clockevents: Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state

2015-05-19T14:18:02+00:00

When no timers/hrtimers are pending, the expiry time is set to a
special value: 'KTIME_MAX'. This normally happens with
NO_HZ_{IDLE|FULL} in both LOWRES/HIGHRES modes.

When 'expiry == KTIME_MAX', we either cancel the 'tick-sched' hrtimer
(NOHZ_MODE_HIGHRES) or skip reprogramming clockevent device
(NOHZ_MODE_LOWRES).  But, the clockevent device is already
reprogrammed from the tick-handler for next tick.

As the clock event device is programmed in ONESHOT mode it will at
least fire one more time (unnecessarily). Timers on few
implementations (like arm_arch_timer, etc.) only support PERIODIC mode
and their drivers emulate ONESHOT over that. Which means that on these
platforms we will get spurious interrupts periodically (at last
programmed interval rate, normally tick rate).

In order to avoid spurious interrupts, the clockevent device should be
stopped or its interrupts should be masked.

A simple (yet hacky) solution to get this fixed could be: update
hrtimer_force_reprogram() to always reprogram clockevent device and
update clockevent drivers to STOP generating events (or delay it to
max time) when 'expires' is set to KTIME_MAX. But the drawback here is
that every clockevent driver has to be hacked for this particular case
and its very easy for new ones to miss this.

However, Thomas suggested to add an optional state ONESHOT_STOPPED to
solve this problem: lkml.org/lkml/2014/5/9/508.

This patch adds support for ONESHOT_STOPPED state in clockevents
core. It will only be available to drivers that implement the
state-specific callbacks instead of the legacy ->set_mode() callback.

Signed-off-by: Viresh Kumar 
Reviewed-by: Preeti U. Murthy 
Cc: linaro-kernel@lists.linaro.org
Cc: Frederic Weisbecker 
Cc: Kevin Hilman 
Cc: Daniel Lezcano 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/b8b383a03ac07b13312c16850b5106b82e4245b5.1428031396.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner

clockevents: Cleanup dead cpu explicitely

2015-04-03T06:44:37+00:00

clockevents_notify() is a leftover from the early design of the
clockevents facility. It's really not a notification mechanism,
it's a multiplex call. We are way better off to have explicit
calls instead of this monstrosity.

Split out the cleanup function for a dead cpu and invoke it
directly from the cpu down code. Make it conditional on
CPU_HOTPLUG as well.

Temporary change, will be refined in the future.

Signed-off-by: Thomas Gleixner 
[ Rebased, added clockevents_notify() removal ]
Signed-off-by: Rafael J. Wysocki 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1735025.raBZdQHM3m@vostro.rjw.lan
Signed-off-by: Ingo Molnar

clockevents: Make tick handover explicit

2015-04-03T06:44:36+00:00

clockevents_notify() is a leftover from the early design of the
clockevents facility. It's really not a notification mechanism,
it's a multiplex call. We are way better off to have explicit
calls instead of this monstrosity.

Split out the tick_handover call and invoke it explicitely from
the hotplug code. Temporary solution will be cleaned up in later
patches.

Signed-off-by: Thomas Gleixner 
[ Rebase ]
Signed-off-by: Rafael J. Wysocki 
Cc: Peter Zijlstra 
Cc: John Stultz 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Link: http://lkml.kernel.org/r/1658173.RkEEILFiQZ@vostro.rjw.lan
Signed-off-by: Ingo Molnar

clockevents: Remove broadcast oneshot control leftovers

2015-04-03T06:44:36+00:00

Now that all users are converted over to explicit calls into the
clockevents state machine, remove the notification chain leftovers.

Original-from: Thomas Gleixner 
Signed-off-by: Rafael J. Wysocki 
Cc: Peter Zijlstra 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: John Stultz 
Link: http://lkml.kernel.org/r/14018863.NQUzkFuafr@vostro.rjw.lan
Signed-off-by: Ingo Molnar

clockevents: Remove the broadcast control leftovers

2015-04-03T06:44:33+00:00

All users converted. Remove the notify leftovers.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Rafael J. Wysocki 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/2076318.76XJZ8QYP3@vostro.rjw.lan
Signed-off-by: Ingo Molnar