linux-toradex.git/drivers/cpuidle/cpuidle-pseries.c, branch v3.14.2

powerpc/pseries/cpuidle: smt-snooze-delay cleanup.

2014-01-29T06:02:24+00:00

smt-snooze-delay was designed to disable NAP state or delay the entry
to the NAP state prior to adoption of cpuidle framework. This
is per-cpu variable. With the coming of CPUIDLE framework,
states can be disabled on per-cpu basis using the cpuidle/enable
sysfs entry.

Also, with the coming of cpuidle driver each state's target residency
is per-driver unlike earlier which was per-device. Therefore,
the per-cpu sysfs smt-snooze-delay which decides the target residency
of the idle state on a particular cpu causes more confusion to the user
as we cannot have different smt-snooze-delay (target residency)
values for each cpu.

In the current code, smt-snooze-delay functionality is completely broken.
It makes sense to remove smt-snooze-delay from idle driver with the
coming of cpuidle framework.
However, sysfs files are retained as ppc64_util currently
utilises it. Once we fix ppc64_util, propose to clean
up the kernel code.

Signed-off-by: Deepthi Dharwar 
Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries/cpuidle: Remove MAX_IDLE_STATE macro.

2014-01-29T06:02:23+00:00

This patch removes the usage of MAX_IDLE_STATE macro
and dead code around it. The number of states
are determined at run time based on the cpuidle
state table selected on a given platform

Signed-off-by: Deepthi Dharwar 
Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries/cpuidle: Make cpuidle-pseries backend driver a non-module.

2014-01-29T06:02:23+00:00

Currently cpuidle-pseries backend driver cannot be
built as a module due to dependencies wrt cpuidle framework.
This patch removes all the module related code in the driver.

Signed-off-by: Deepthi Dharwar 
Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries/cpuidle: Use cpuidle_register() for initialisation.

2014-01-29T06:02:22+00:00

This patch replaces the cpuidle driver and devices initialisation
calls with a single generic cpuidle_register() call
and also includes minor refactoring of the code around it.

Remove the cpu online check in snooze loop, as this code can
only locally run on a cpu only if it is online. Therefore,
this check is not required.

Signed-off-by: Deepthi Dharwar 
Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries/cpuidle: Move processor_idle.c to drivers/cpuidle.

2014-01-29T06:02:22+00:00

Move the file from arch specific pseries/processor_idle.c
to drivers/cpuidle/cpuidle-pseries.c
Make the relevant Makefile and Kconfig changes.
Also, introduce Kconfig.powerpc in drivers/cpuidle
for all powerpc cpuidle drivers.

Signed-off-by: Deepthi Dharwar 
Signed-off-by: Benjamin Herrenschmidt