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powerpc/64s: Invalidate ERAT on powersave wakeup for POWER9

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On POWER9 the ERAT may be incorrect on wakeup from some stop states
that lose state. This causes random segvs and illegal instructions
when these stop states are enabled.

This patch invalidates the ERAT on wakeup on POWER9 to prevent this
from causing a problem.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Merge comment change with upstream changes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-06-24 12:29:01 -05:00 committed by Michael Ellerman
parent 74e27c6af5
commit ba6d334ac2
2 changed files with 12 additions and 3 deletions
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8
arch/powerpc/kernel/exceptions-64s.S
View File

@ -99,9 +99,11 @@ EXC_VIRT_NONE(0x4000, 0x100)
#ifdef CONFIG_PPC_P7_NAP
/*
* If running native on arch 2.06 or later, check if we are waking up
* from nap/sleep/winkle, and branch to idle handler. The idle wakeup
* handler initially runs in real mode, but we branch to the 0xc000...
* address so we can turn on relocation with mtmsr.
* from nap/sleep/winkle, and branch to idle handler. This tests SRR1
* bits 46:47. A non-0 value indicates that we are coming from a power
* saving state. The idle wakeup handler initially runs in real mode,
* but we branch to the 0xc000... address so we can turn on relocation
* with mtmsr.
*/
#define IDLETEST(n) \
BEGIN_FTR_SECTION ; \

7
arch/powerpc/kernel/idle_book3s.S
View File

@ -435,6 +435,13 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
* cr3 - set to gt if waking up with partial/complete hypervisor state loss
*/
pnv_restore_hyp_resource_arch300:
/*
* Workaround for POWER9, if we lost resources, the ERAT
* might have been mixed up and needs flushing.
*/
blt cr3,1f
PPC_INVALIDATE_ERAT
1:
/*
* POWER ISA 3. Use PSSCR to determine if we
* are waking up from deep idle state