simple_plug: New CPU hot plug module
simple_plug: add more knobs and make it more responsive

Decreased the polling interval to make it more responsive and
added additional parameters to make it easier to debug.
simple_plug: Cleanup, improve resume and allow period to be configured
simple_plug: startup fix, less flapping

Work around a race condition on startup (see the comments in this
commit).

Decrease the frequency that we bring cores off/online by having
a bigger spread between going online and taking it back offline.
simple_plug: add missing newlines in info messages
simple_plug: make stats optional and remove a conditional

This makes a slight improvement in the CPU utilization of
simple_plug by streamlining the work done while polling.
Reporting the number of online cores in sysfs
When hotplugging in a CPU, set its frequency at the policy max.
simple_plug: slight changes to when to plug/unplug
simple_plug: periodically verify that the right cores are online

It was pointed out that something like Kernel Tuner may decide
to bring cores online and simple_plug doesn't take them back
offline until it happens to have brought them online and then
decide to take them back offline.

Add a periodic (5 seconds by default) check to see that the right
cores on on/off-line.

Having this verification lets me clean up the code somewhat.
simple_plug: handle external changes to running cores

This commit makes simple_plug be more friendly to apps that insist
on starting or stopping cores on their own.

As soon as we discover that the number of running cores were externally
modified, we give a 2 minute grace people to let the application do
what it needs to do.  After the 2 minute grace period, we force the
state of the cores back to what we think it should be.

During the grace period, we make no further modification to the
state of the cores.
simple_plug: clean condition compilation
simple_plug: set max frequency

Fix a bug in setting the max frequency of cores when they are plugged
into the system.

When resuming, set cpu0 to max frequency.
simple_plug: no longer need to verify after a suspend

When we suspend, we force a known state so it is safe to cancel
any pending verification.
PM: devfreq: init performance/powersave governor

Performance and powersave governor's get_target_freq
is not called if driver chooses one of these two governors.
Add init function in governor profile to call update_devfreq
which will call get_target_freq subsequently.

Signed-off-by: Xiaoguang Chen <chenxg@marvell.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Git-commit: 0b7c328fd3ef253c04854dab16c6dd0797963637
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I0d1c4a415d3203083979635cc9f909ab296c76b4
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
PM / devfreq: Core updates to support devices which can idle

Prepare devfreq core framework to support devices which
can idle. When device idleness is detected perhaps through
runtime-pm, need some mechanism to suspend devfreq load
monitoring and resume back when device is online. Present
code continues monitoring unless device is removed from
devfreq core.

This patch introduces following design changes,

 - use per device work instead of global work to monitor device
   load. This enables suspend/resume of device devfreq and
   reduces monitoring code complexity.
 - decouple delayed work based load monitoring logic from core
   by introducing helpers functions to be used by governors. This
   provides flexibility for governors either to use delayed work
   based monitoring functions or to implement their own mechanism.
 - devfreq core interacts with governors via events to perform
   specific actions. These events include start/stop devfreq.
   This sets ground for adding suspend/resume events.

The devfreq apis are not modified and are kept intact.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 7e6fdd4bad033fa2d73716377b184fa975b0d985
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[jgebben@codeaurora.org use INIT_DELAYED_WORK_DEFERRABLE macro]
Change-Id: I275b9a3a10b8c676cdbcdd46eaf1a5aa339bfab6
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
PM / devfreq: Add suspend and resume apis

Add devfreq suspend/resume apis for devfreq users. This patch
supports suspend and resume of devfreq load monitoring, required
for devices which can idle.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 206c30cfeb7c05dfb9fdfd81b1deb933627e43c1
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I34d805d9fc211b8a1e0b15cf9816c37c8f8f9ffa
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
PM / devfreq: Add current freq callback in device profile

Devfreq returns governor predicted frequency as current frequency
via sysfs interface. But device may not support all frequencies
that governor predicts. So add a callback in device profile to get
current freq from driver. Also add a new sysfs node to expose
governor predicted next target frequency.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit:  7f98a905dca6e4f144cdd4462edeac00c2bdc379
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I2e8f27c2ee2529230cb93e135439e012266a66b8
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
PM / devfreq: kernel-doc typo corrections

Parameter documentation needs a ':' for scripts/kernel-doc
to parse properly.

Minor fixes for ones warned by:
./scripts/kernel-doc -text drivers/devfreq/devfreq.c>/dev/null

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: c5b4a1c15da3e6f472c6ff1a085a1134d18a1464
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Ie5613553bd97884100b4c437bb6a73e7e654603a
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
PM / devfreq: fix sscanf handling for writable sysfs entries

sscanf returns 0 when an invalid parameter like:
echo -n "a">min_freq
is attempted. Returning back the return result(0) will
cause the command not to return back to command
prompt.

Instead, just return -EINVAL when sscanf does not
return 1.

This is done for min_freq, max_freq and polling_interval

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 12e26265e6225bf93b2fdc70399774b31e2dd980
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I58e88f024887236433b14ee2ab8a5d2ad814083d
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>