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| author | Florian Fainelli <f.fainelli@gmail.com> | 2017-12-01 01:10:11 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-17 22:15:37 +0000 |
| commit | 55de88778f4bfe6333db4e475afb15ef413b4874 (patch) | |
| tree | 0356ce4d899ff7e982754e551e24177e92b1694d /include/linux/cpuhotplug.h | |
| parent | 1238c4fd4812e225c93bc4c152769afa8493f903 (diff) | |
| download | linux-0-day-55de88778f4bfe6333db4e475afb15ef413b4874.tar.gz linux-0-day-55de88778f4bfe6333db4e475afb15ef413b4874.tar.xz | |
ARM: 8726/1: B15: Add CPU hotplug awareness
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>
Diffstat (limited to 'include/linux/cpuhotplug.h')
| -rw-r--r-- | include/linux/cpuhotplug.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 201ab72679863..3f7b30fcc96ac 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -59,6 +59,7 @@ enum cpuhp_state { CPUHP_PCI_XGENE_DEAD, CPUHP_IOMMU_INTEL_DEAD, CPUHP_LUSTRE_CFS_DEAD, + CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, @@ -137,6 +138,7 @@ enum cpuhp_state { CPUHP_AP_ARM64_ISNDEP_STARTING, CPUHP_AP_SMPCFD_DYING, CPUHP_AP_X86_TBOOT_DYING, + CPUHP_AP_ARM_CACHE_B15_RAC_DYING, CPUHP_AP_ONLINE, CPUHP_TEARDOWN_CPU, CPUHP_AP_ONLINE_IDLE, |