ARM: 8726/1: B15: Add CPU hotplug awareness

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The Broadcom Brahma-B15 readahead cache needs to be disabled,
respectively re-enable during a CPU hotplug. In case we were not to do,
CPU hotplug would occasionally fail with random crashes when a given CPU
exits the coherency domain while the RAC is still enabled, as it would
get stale data from the RAC.

In order to avoid adding any specific B15 readahead-cache awareness to
arch/arm/mach-bcm/hotplug-brcmstb.c we use a CPU hotplug state machine
which allows us to catch CPU hotplug events and disable/flush enable the
RAC accordingly.

Signed-off-by: Alamy Liu <alamyliu@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

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Florian Fainelli 2017-12-01 01:10:11 +01:00 • committed by Russell King

parent 1238c4fd48

commit 55de88778f

2 changed files with 93 additions and 0 deletions

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91

arch/arm/mm/cache-b15-rac.c

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2

include/linux/cpuhotplug.h

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