linux-toradex.git/drivers/acpi/processor_thermal.c, branch v3.4.73

ACPI: Do cpufreq clamping for throttling per package v2

2012-03-22T06:16:14+00:00

On Intel CPUs the processor typically uses the highest frequency
set by any logical CPU. When the system overheats
Linux first forces the frequency to the lowest available one
to lower the temperature.

However this was done only per logical CPU, which means all
logical CPUs in a package would need to go through this before
the frequency is actually lowered.

Worse this delay actually prevents real throttling, because
the real throttle code only proceeds when the lowest frequency
is already reached.

So when a throttle event happens force the lowest frequency
for all CPUs in the package where it happened. The per CPU
state is now kept per package, not per logical CPU. An alternative
would be to do it per cpufreq unit, but since we want to bring
down the temperature of the complete chip it's better
to do it for all.

In principle it may even make sense to do it for all CPUs,
but I kept it on the package for now.

With this change the frequency is actually lowered, which
in terms also allows real throttling to proceed.

I also removed an unnecessary per cpu variable initialization.

v2: Fix package mapping

Cc: 
Signed-off-by: Andi Kleen 
Signed-off-by: Len Brown

cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem

2011-12-21T22:29:42+00:00

This moves the 'cpu sysdev_class' over to a regular 'cpu' subsystem
and converts the devices to regular devices. The sysdev drivers are
implemented as subsystem interfaces now.

After all sysdev classes are ported to regular driver core entities, the
sysdev implementation will be entirely removed from the kernel.

Userspace relies on events and generic sysfs subsystem infrastructure
from sysdev devices, which are made available with this conversion.

Cc: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
Cc: Tony Luck 
Cc: Fenghua Yu 
Cc: Arnd Bergmann 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Paul Mundt 
Cc: "David S. Miller" 
Cc: Chris Metcalf 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: Borislav Petkov 
Cc: Tigran Aivazian 
Cc: Len Brown 
Cc: Zhang Rui 
Cc: Dave Jones 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Andrew Morton 
Cc: Arjan van de Ven 
Cc: "Rafael J. Wysocki" 
Cc: "Srivatsa S. Bhat" 
Signed-off-by: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

ACPI: constify ops structs

2011-07-16T22:36:17+00:00

Structs battery_file, acpi_dock_ops, file_operations,
thermal_cooling_device_ops, thermal_zone_device_ops, kernel_param_ops
are not changed in runtime.  It is safe to make them const.
register_hotplug_dock_device() was altered to take const "ops" argument
to respect acpi_dock_ops' const notion.

Signed-off-by: Vasiliy Kulikov 
Acked-by: Jeff Garzik 
Signed-off-by: Len Brown

ACPI thermal: remove two unused functions

2010-12-11T07:01:47+00:00

When CONFIG_CPU_FREQ=n ...

drivers/acpi/processor_thermal.c:159:12: warning: ‘acpi_thermal_cpufreq_increase’ defined but not used
drivers/acpi/processor_thermal.c:163:12: warning: ‘acpi_thermal_cpufreq_decrease’ defined but not used

Remove unused declaration of ‘acpi_thermal_cpufreq_increase’ and
‘acpi_thermal_cpufreq_decrease’

Signed-off-by: Zhang Rui 
Signed-off-by: Len Brown

ACPI: thermal: remove unused limit code

2010-10-19T17:58:34+00:00

acpi_processor_apply_limit()
acpi_thermal_cpufreq_increase()
acpi_thermal_cpufreq_decrease()

Signed-off-by: Len Brown

ACPI: remove dead code

2010-10-19T17:44:21+00:00

Found by running make namespacecheck on linux-next

Signed-off-by: Stephen Hemminger 
Signed-off-by: Len Brown

ACPI processor: remove deprecated ACPI procfs I/F

2010-08-15T04:31:45+00:00

Remove deprecated ACPI processor procfs I/F, including:
/proc/acpi/processor/CPUX/power
/proc/acpi/processor/CPUX/limit
/proc/acpi/processor/CPUX/info

/proc/acpi/processor/CPUX/throttling still exists,
as we don't have sysfs I/F available for now.

Signed-off-by: Zhang Rui 
Signed-off-by: Len Brown

ACPI: Remove unnecessary cast.

2010-01-16T04:06:44+00:00

The struct seq_file 'private' member is a void *, the cast is not needed.
Also, remove an extra whitespace line.

Signed-off-by: H Hartley Sweeten 
Signed-off-by: Len Brown

Merge branch 'processor-procfs-2.6.32' into release

2009-09-19T06:10:40+00:00

ACPI: Move definition of PREFIX from acpi_bus.h to internal..h

2009-08-28T23:57:27+00:00

Linux/ACPI core files using internal.h all PREFIX "ACPI: ",
however, not all ACPI drivers use/want it -- and they
should not have to #undef PREFIX to define their own.

Add GPL commment to internal.h while we are there.

This does not change any actual console output,
asside from a whitespace fix.

Signed-off-by: Len Brown