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Groups > linux.kernel > #1622036
| From | "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 2/3] powernv:idle: Decouple TB restore & Per-core SPRs restore |
| Date | 2017-04-12 13:50 +0200 |
| Message-ID | <tvoWC-3Wi-11@gated-at.bofh.it> (permalink) |
| References | <tvoWB-3Wi-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> The idle-exit code assumes that if Timebase is not lost, then neither are the per-core hypervisor resources lost. This was true on POWER8 where fast-sleep lost only TB but not per-core resources, and winkle lost both. This assumption is not true for POWER9 however, since there can be states which do not lose timebase but can lose per-core SPRs. Hence check if we need to restore the per-core hypervisor state even if timebase is not lost. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> --- arch/powerpc/kernel/idle_book3s.S | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index 9b747e9..6a9bd28 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -723,13 +723,14 @@ timebase_resync: * Use cr3 which indicates that we are waking up with atleast partial * hypervisor state loss to determine if TIMEBASE RESYNC is needed. */ - ble cr3,clear_lock + ble cr3,.Ltb_resynced /* Time base re-sync */ bl opal_resync_timebase; /* - * If waking up from sleep, per core state is not lost, skip to - * clear_lock. + * If waking up from sleep (POWER8), per core state + * is not lost, skip to clear_lock. */ +.Ltb_resynced: blt cr4,clear_lock /* -- 1.9.4
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[PATCH 2/3] powernv:idle: Decouple TB restore & Per-core SPRs restore "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> - 2017-04-12 13:50 +0200
Re: [PATCH 2/3] powernv:idle: Decouple TB restore & Per-core SPRs restore Michael Neuling <mikey@neuling.org> - 2017-04-13 09:00 +0200
Re: [PATCH 2/3] powernv:idle: Decouple TB restore & Per-core SPRs restore Gautham R Shenoy <ego@linux.vnet.ibm.com> - 2017-04-13 14:00 +0200
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