fs/dyn_sync_cntrl: dynamic sync control

The dynamic sync control interface uses Android kernel's unique early
suspend / lat resume interface.

While screen is on, file sync is disabled
when screen is off, a file sync is called to flush all outstanding writes
and restore file sync operation as normal.

Signed-off-by: Paul Reioux <reioux@gmail.com>
block: Add support for reinsert a dispatched req

Add support for reinserting a dispatched request back to the
scheduler's internal data structures.
Add API for verifying whether the current scheduler
supports reinserting requests mechanism

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
backported from Linux 3.5+ to Linux 3.0 by faux123
block: Add API for urgent request handling

This patch add support in block & elevator layers for handling
urgent requests.
Urgent request notification passed to underlying driver (eMMC for
example) and causes interruption of low priority current request in
order to execute the urgent one.

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
backported from Linux 3.5+ to Linux 3.0 by faux123
row: Adding support for reinsert already dispatched req

Add support for reinserting already dispatched request back to the
schedulers internal data structures.
The request will be reinserted back to the queue (head) it was
dispatched from as if it was never dispatched.

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>

Conflicts:

	block/row-iosched.c
row: Add support for urgent request handling

This patch add support for handling urgent requests.
ROW queue can be marked as "urgent" so if it was un-served and a
request was added to it - it will trigger issuing urgent request
to the driver.

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
scheduler: Re-compute time-average nr_running on read

Re-compute time-average nr_running when it is read. This would
prevent reading stalled average value if there were no run-queue
changes for a long time. New average value is returned to the reader,
but not stored to avoid concurrent writes. Light-weight sequential
counter synchronization is used to assure data consistency for
re-computing average.

Change-Id: I8e4ea1b28ea00b3ddaf6ef7cdcd27866f87d360b
Signed-off-by: Alex Frid <afrid@nvidia.com>
(cherry picked from commit 527a759d9b40bf57958eb002edd2bb82014dab99)
Reviewed-on: http://git-master/r/111637
Reviewed-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Tested-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>

Conflicts:

	kernel/sched.c
proc: enhance time-average nr_running stats

Add time-average nr_running to loadavg printout

Bug 958978

Change-Id: I5c6904efb52a86f4964eb66c1576fc91f60f5b1d
Signed-off-by: Alex Frid <afrid@nvidia.com>
(cherry picked from commit 86f3642cc44a69d1e4798719bd9182cd6923f526)
Reviewed-on: http://git-master/r/111636
Reviewed-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Tested-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
scheduler: compute time-average nr_running per run-queue

Compute the time-average number of running tasks per run-queue for a
trailing window of a fixed time period. The detla add/sub to the
average value is weighted by the amount of time per nr_running value
relative to the total measurement period.

Change-Id: I076e24ff4ed65bed3b8dd8d2b279a503318071ff
Signed-off-by: Diwakar Tundlam <dtundlam@nvidia.com>
(cherry picked from commit 3a12d7499cee352e8a46eaf700259ba3c733f0e3)
Reviewed-on: http://git-master/r/111635
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Tested-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>

Conflicts:

	kernel/sched.c
gpu overclocking: add extra level and reduce nominal level from 1 to 2

this should save some power from gpu overclocking
msm: spm: Allow setting of voltages across cpus

The original intent of disallowing voltage set across cpus is to prevent
setting of voltages on a core when its idle thread. The cpufreq
framework ensures that the frequency changes and hence the voltage
changes happens on the respective cpus. By allowing setting of voltages
from others cpus, the secondary cores can be brought out of reset by the
non-primary CPUs after boot and thereby help mitigate any thermal issues
associated wth multicores.

The regulator framework that calls into msm_spm_set_vdd provides the
necessary access restrictions to prevent simultaneous calls into
msm_spm_set_vdd.And hence the spinlocks around the set_vdd calls have
been removed.

CRs-Fixed: 374783
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
(cherry picked from commit 896d25353b95d647ba8f6cf3ea12e3170cd00f55)

Change-Id: If9b642be3ed4e4cfe4239ce7f845c16a8996c05b
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
modified for HTC kernels from CAF reference by faux123
msm: hotplug: support hotplug with wfi only power collapse

Currently the pen_release is not set to -1 after we return from
msm_pm_cpu_enter_lowpower. This doesn't happen when we actually power
collapse, but it does when we only wfi. This will cause the next hotplug
attempt to fail and crash the system, as the cpu comes up when the
system is not expecting it. Fix this by explicitly setting the
pen_release when we wake up in this manner.

Change-Id: Ib39c406091412b04510df5de660fd6346763f2b8
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
(cherry picked from commit 766ccf63f869157a6c992bccc4d9f1dc52cb89b8)
gpu overclock: add 300MHz entry and change max GPU to 300MHz

also adjust the low nominal entry from 178MHz to 160MHz to further
reduce gpu clock

Conflicts:

	arch/arm/mach-msm/devices-msm8x60.c
msm: kgsl: Allow SLEEP/SLUMBER/SUSPEND states to wake to nominal voltage

Waking in turbo drains power while the high nominal frequency of 300MHz is
generally enough to handle rapid requests.

Change-Id: I01a8261b6431556b483e59d1c2ae539ff094c751
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/devices-8960.c
	drivers/gpu/msm/kgsl.c
modified for HTC Amaze from CAF ref by faux123
cpufreq/cpufreq_intellidemand: intellidemand cpufreq governor (version 3.0)

Intellidemand is inspired by ondemand governor. Its main features are:

 - auto cpu hotplugging based on runnable thread average calculations
 - detection of browsing mode (long screen on activities with moderate run
   queue depth =< 45 )
 - limit max frequencies when in browsing mode to conserve battery for long
   duration tasks

Browsing State Determination:
 1- Browsing state is enabled as power-on default. Browsing state is disabled
    when run queue depth is > 45 (very high instantaneous spikes)

Browsing State Limit Max Freq Logic (sliding window algorithm):
 1- While Screen is ON > 3 min, and average load of the CPU is < 35%, then
    CPU Max frequencies will remain power-on default
 2- While Screen is On, if average CPU load > 35%, both CPUs max frequencies
    will be limited to a lower user configurable max value
 3- While Screen is On, After both CPUs' Max is limited to lowered max, when
    the average CPU load has dropped down to less than < 25%, then both CPUs
    Max freq will be restored to back to power-on default

Runnable Thread Auto-hotplug (fast hotplug / slow unplug algorithm):
 1- When average number of running thread is < threshold, 2nd cpu will be
    unplugged.
 2- When > threshold, 2nd cpu will be hotplugged.
 3- The logic applies a fast hotplug and slow unplug algorithm so 2nd core
    will stay enabled longer to help deal with performance spikes

changes from Ver 2.0 -> Ver 3.0:
  - remove GPU Busy dependency for browsing state detection (this will make
    the governor more portable to other platforms without specific GPU
    architecture knowledge)

dependencies:
  -- Qualcomm's run queue average logic (SOC independent logic)
  -- TI's runnable thread average logic (SOC independent logic)

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:

	arch/arm/mach-msm/cpufreq.c
ARM: 7467/1: mutex: use generic xchg-based implementation for ARMv6+

The open-coded mutex implementation for ARMv6+ cores suffers from a
severe lack of barriers, so in the uncontended case we don't actually
protect any accesses performed during the critical section.

Furthermore, the code is largely a duplication of the ARMv6+ atomic_dec
code but optimised to remove a branch instruction, as the mutex fastpath
was previously inlined. Now that this is executed out-of-line, we can
reuse the atomic access code for the locking (in fact, we use the xchg
code as this produces shorter critical sections).

This patch uses the generic xchg based implementation for mutexes on
ARMv6+, which introduces barriers to the lock/unlock operations and also
has the benefit of removing a fair amount of inline assembly code.

Cc: <stable@vger.kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Reported-by: Shan Kang <kangshan0910@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
modified for MSM architecture by faux123
mutex: Place lock in contended state after fastpath_lock failure

ARM recently moved to asm-generic/mutex-xchg.h for its mutex
implementation after the previous implementation was found to be missing
some crucial memory barriers. However, this has revealed some problems
running hackbench on SMP platforms due to the way in which the
MUTEX_SPIN_ON_OWNER code operates.

The symptoms are that a bunch of hackbench tasks are left waiting on an
unlocked mutex and therefore never get woken up to claim it. This boils
down to the following sequence of events:

        Task A        Task B        Task C        Lock value
0                                                     1
1       lock()                                        0
2                     lock()                          0
3                     spin(A)                         0
4       unlock()                                      1
5                                   lock()            0
6                     cmpxchg(1,0)                    0
7                     contended()                    -1
8       lock()                                        0
9       spin(C)                                       0
10                                  unlock()          1
11      cmpxchg(1,0)                                  0
12      unlock()                                      1

At this point, the lock is unlocked, but Task B is in an uninterruptible
sleep with nobody to wake it up.

This patch fixes the problem by ensuring we put the lock into the
contended state if we fail to acquire it on the fastpath, ensuring that
any blocked waiters are woken up when the mutex is released.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@vger.kernel.org>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-6e9lrw2avczr0617fzl5vqb8@git.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
board-ruby: disable dynamic LED

Conflicts:

	arch/arm/mach-msm/board-ruby.c
board/display: fix inconsistent BL issues

Conflicts:

	arch/arm/mach-msm/display/ruby-panel.c
intellidemand: add a run queue persistence to determine browsing state

persistence will allow for better browsing state detection rather than just
purely based on run queue depth alone

Signed-off-by: Paul Reioux <reioux@gmail.com>
board/display: lower display panel voltages to 2.85 volts

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:

	arch/arm/mach-msm/display/ruby-panel.c