powernow-k8: Add core performance boost support

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Starting with F10h, revE, AMD processors add support for a dynamic
core boosting feature called Core Performance Boost. When a specific
condition is present, a subset of the cores on a system are boosted
beyond their P0 operating frequency to speed up the performance of
single-threaded applications.

In the normal case, the system comes out of reset with core boosting
enabled. This patch adds a sysfs knob with which core boosting can be
switched on or off for benchmarking purposes.

While at it, make the CPB code hotplug-aware so that taking cores
offline wouldn't interfere with boosting the remaining online cores.
Furthermore, add cpu_online_mask hotplug protection as suggested by
Andrew.

Finally, cleanup the driver init codepath and update copyrights.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1270065406-1814-3-git-send-email-bp@amd64.org>
Reviewed-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Borislav Petkov 2010-03-31 21:56:42 +02:00 • committed by H. Peter Anvin

parent 5958f1d5d7

commit 73860c6b2f

2 changed files with 151 additions and 12 deletions

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161

arch/x86/kernel/cpu/cpufreq/powernow-k8.c

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2

arch/x86/kernel/cpu/cpufreq/powernow-k8.h

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