intellidemand: Add boost pulse capability

Boost pulse increases UI performance by increasing CPU freq and
reduce sampling time.

Signed-off-by: Paul Reioux <reioux@gmail.com>
intellidemand: add bug fixes

 - Fix crash input event handler on governor switch
 - Fix panic when setting sampling rate

Signed-off-by: Paul Reioux <reioux@gmail.com>
intellidemand: increase nr_run_threshold back to 5 with PowerHAL available
intellidemand: tweak for better UI and Battery performance
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>
intellidemand: WIP tweaks
intellidemand: add minimum cpu performance lock

a minimum cpu frequency performance lock is add to ensure smooth
operations when only 1 core is active

Signed-off-by: Paul Reioux <reioux@gmail.com>
wip: intellidemand tweaks
intellidemand: wip tweak
drivers/gpu/pvr/pvr_governor: add a simple PVR GPU governor

this simple PVR GPU governor will scale between 3 speeds:
  idle -- GPU not active
  nominal -- GPU active with low graphical load
  turbo -- GPU active and boosted to max frequency

This should further save battery by intelligently selecting GPU frequency
based on GPU loading.

Signed-off-by: Paul Reioux <reioux@gmail.com>
sched: add a new SD SHARE_POWERLINE flag for sched_domain

This new flag SD SHARE_POWERLINE reflects the sharing of the power rail
between the members of a domain. As this is the current assumption of the
scheduler, the flag is added to all sched_domain

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
backported to Tuna Hybrid kernel by faux123
Signed-off-by: Paul Reioux <reioux@gmail.com>
sched: pack small tasks

During sched_domain creation, we define a pack buddy CPU if available.

On a system that share the powerline at all level, the buddy is set to -1

On a dual clusters / dual cores system which can powergate each core and
cluster independantly, the buddy configuration will be :
      | CPU0 | CPU1 | CPU2 | CPU3 |
-----------------------------------
buddy | CPU0 | CPU0 | CPU0 | CPU2 |
Small tasks tend to slip out of the periodic load balance.
The best place to choose to migrate them is at their wake up.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
backported for Tuna Hybrid kernel by faux123

also backported sched: Clean up domain traversal in select_idle_sibling()

to support the above backport

Signed-off-by: Paul Reioux <reioux@gmail.com>
sched: secure access to other CPU statistics

The atomic update of runnable_avg_sum and runnable_avg_period are ensured
by their size and the toolchain. But we must ensure to not read an old value
for one field and a newly updated value for the other field. As we don't
want to lock other CPU while reading these fields, we read twice each fields
and check that no change have occured in the middle.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
backported for Tuna Hybrid kernel by faux123
sched: pack the idle load balance

Look for an idle CPU close the pack buddy CPU whenever possible.
The goal is to prevent the wake up of a CPU which doesn't share the power
line of the pack CPU

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
backported for Tuna Hybrid kernel by faux123
ARM: 7011/1: Add ARM cpu topology definition

The affinity between ARM processors is defined in the MPIDR register.
We can identify which processors are in the same cluster,
and which ones have performance interdependency. We can define the
cpu topology of ARM platform, that is then used by sched_mc and sched_smt.

The default state of sched_mc and sched_smt config is disable.
When enabled, the behavior of the scheduler can be modified with
sched_mc_power_savings and sched_smt_power_savings sysfs interfaces.

Changes since v4 :
*  Remove unnecessary parentheses and blank lines

Changes since v3 :
* Update the format of printk message
* Remove blank line

Changes since v2 :
* Update the commit message and some comments

Changes since v1 :
* Update the commit message
* Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h
* Modify header of arch/arm/kernel/topology.c
* Modify tests and manipulation of MPIDR's bitfields
* Modify the place and dependancy of the config
* Modify Noop functions

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 7182/1: ARM cpu topology: fix warning

kernel/sched.c:7354:2: warning: initialization from incompatible pointer type

Align cpu_coregroup_mask prototype interface with sched_domain_mask_f typedef
use int cpu instead of unsigned int cpu

Cc: <stable@vger.kernel.org>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: sched: clear SD_SHARE_POWERLINE

The ARM platforms take advantage of packing small tasks on few cores.
This is true even when the cores of a cluster can't be powergated
independantly.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
wip: intellidemand tweaks
wip: intellidemand tweaks
Revert "mm: Wait for writeback when grabbing pages to begin a write"

This reverts commit 3d08bcc887a1c8d12be8d81f747ffa2e8a44b67b.