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Date: Fri, 4 Aug 2017 22:30:19 +0530 From: Gautham R Shenoy <ego@...ux.vnet.ibm.com> To: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com> Cc: Michael Ellerman <mpe@...erman.id.au>, Michael Neuling <mikey@...ling.org>, Nicholas Piggin <npiggin@...il.com>, Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>, Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>, "Rafael J. Wysocki" <rafael@...nel.org>, Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com>, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org Subject: Re: [PATCH] powernv:idle: Disable LOSE_FULL_CONTEXT states when stop-api fails. On Fri, Aug 04, 2017 at 12:34:22PM +0530, Gautham R. Shenoy wrote: > From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com> > > 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 > excluding their flags supported_cpuidle_states. Further, we ensure in > the initialization of the cpuidle-powernv driver to only include those > states whose flags are present in supported_cpuidle_states. > > Fixes: 1e1601b38e6 ("powerpc/powernv/idle: Restore SPRs for deep idle > states via stop API.") > Forgot to add Reported-by: Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com> > Signed-off-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com> -- Thanks and Regards gautham.
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