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![]() Currently, we use the opal call opal_slw_set_reg() to inform the
Sleep-Winkle Engine (SLW) to restore the contents of some of the
Hypervisor state on wakeup from deep idle states that lose full
hypervisor context (characterized by the flag
OPAL_PM_LOSE_FULL_CONTEXT).
However, the current code has a bug in that if opal_slw_set_reg()
fails, we don't disable the use of these deep states (winkle on
POWER8, stop4 onwards on POWER9).
This patch fixes this bug by ensuring that if programing the
sleep-winkle engine to restore the hypervisor states in
pnv_save_sprs_for_deep_states() fails, then we exclude such states by
clearing the OPAL_PM_LOSE_FULL_CONTEXT flag from
supported_cpuidle_states. As a result POWER8 will be prevented from
using winkle for CPU-Hotplug, and POWER9 will put the offlined CPUs to
the default stop state when available.
Further, we ensure in the initialization of the cpuidle-powernv driver
to only include those states whose flags are present in
supported_cpuidle_states, thereby skipping OPAL_PM_LOSE_FULL_CONTEXT
states when they have been disabled due to stop-api failure.
Fixes:
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.. | ||
governors | ||
coupled.c | ||
cpuidle-arm.c | ||
cpuidle-at91.c | ||
cpuidle-big_little.c | ||
cpuidle-calxeda.c | ||
cpuidle-clps711x.c | ||
cpuidle-cps.c | ||
cpuidle-exynos.c | ||
cpuidle-kirkwood.c | ||
cpuidle-mvebu-v7.c | ||
cpuidle-powernv.c | ||
cpuidle-pseries.c | ||
cpuidle-ux500.c | ||
cpuidle-zynq.c | ||
cpuidle.c | ||
cpuidle.h | ||
driver.c | ||
dt_idle_states.c | ||
dt_idle_states.h | ||
governor.c | ||
Kconfig | ||
Kconfig.arm | ||
Kconfig.mips | ||
Kconfig.powerpc | ||
Makefile | ||
sysfs.c |