[PATCH 0/5] cpufreq:boost: CPU Boost mode support

Lukasz Majewski
2013-06-06T07:07:47Z

This patch series introduces support for CPU overclocking technique
called Boost.

It is a follow up of a LAB governor proposal. Boost is a LAB component:
http://thread.gmane.org/gmane.linux.kernel/1484746/match=cpufreq

Boost unifies hardware based solution (e.g. Intel Nehalem) with
software oriented one (like the one done at Exynos).
For this reason cpufreq/freq_table code has been reorganized to exclude
common code.

Important design decisions:

- Boost related code is compiled-in unconditionally. I wanted to avoid
situation when a lot of #ifdef CONFIG_CPU_FREQ_BOOST are scattered at
cpufreq code (especially cpufreq.c large file)

- Only one cpufreq_boost instance is created at cpufreq driver file.

- Boost can manage overclocking when many policies are istalled in
the system (this is a preparation for b.L)

- Boost sysfs attributies are seen only when cpufreq driver supports them.
They will not show up until either CONFIG_CPU_FREQ_BOOST or device tree
cpufreq "boost_mode" attribute is defined.

- No special spin_lock for Boost was created. The one from cpufreq was
reused.

- Low level boost trigger function (*low_level_boost function callback) is
necessary to "glue" together acpi-cpufreq boost with software based one.

Tested at: HW: Exynos 4412 3.10 linux
Compile tested x86_64 defconfig (acpi) - help with HW test
needed

Lukasz Majewski (5):
cpufreq: Define cpufreq_set_drv_attr_files() to add per CPU sysfs
attributes
cpufreq:boost: Add support for software based CPU frequency boost
cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common
boost solution
cpufreq:exynos:Extend exynos cpufreq driver to support boost
cpufreq:boost:Kconfig: Enable boost support at Kconfig

drivers/cpufreq/Kconfig | 7 ++
drivers/cpufreq/acpi-cpufreq.c | 64 ++++++--------
drivers/cpufreq/cpufreq.c | 175 ++++++++++++++++++++++++++++++++++++--
drivers/cpufreq/exynos-cpufreq.c | 48 +++++++++++
drivers/cpufreq/freq_table.c | 87 ++++++++++++++++++-
include/linux/cpufreq.h | 35 +++++++-
6 files changed, 369 insertions(+), 47 deletions(-)

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1.7.10.4