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powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 PMU workaround on DD2.1 

DD2.1 does not have to save MMCR0 for all state-loss idle states,
only after deep idle states (like other PMU registers).

Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-11-03 15:13:21 +11:00 committed by Michael Ellerman
parent 9d2f510a66
commit e3646330cf
1 changed files with 19 additions and 12 deletions
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31
arch/powerpc/kernel/idle_book3s.S
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@ -112,12 +112,14 @@ power9_save_additional_sprs:
std r4, STOP_HFSCR(r13)
mfspr r3, SPRN_MMCRA
mfspr r4, SPRN_MMCR1
mfspr r4, SPRN_MMCR0
std r3, STOP_MMCRA(r13)
std r4, STOP_MMCR1(r13)
std r4, _MMCR0(r1)
mfspr r3, SPRN_MMCR2
std r3, STOP_MMCR2(r13)
mfspr r3, SPRN_MMCR1
mfspr r4, SPRN_MMCR2
std r3, STOP_MMCR1(r13)
std r4, STOP_MMCR2(r13)
blr
power9_restore_additional_sprs:
@ -135,11 +137,14 @@ power9_restore_additional_sprs:
ld r4, STOP_MMCRA(r13)
mtspr SPRN_HFSCR, r3
mtspr SPRN_MMCRA, r4
/* We have already restored PACA_MMCR0 */
ld r3, STOP_MMCR1(r13)
ld r4, STOP_MMCR2(r13)
mtspr SPRN_MMCR1, r3
mtspr SPRN_MMCR2, r4
ld r3, _MMCR0(r1)
ld r4, STOP_MMCR1(r13)
mtspr SPRN_MMCR0, r3
mtspr SPRN_MMCR1, r4
ld r3, STOP_MMCR2(r13)
mtspr SPRN_MMCR2, r3
blr
/*
@ -350,6 +355,7 @@ power_enter_stop:
b pnv_wakeup_noloss
.Lhandle_esl_ec_set:
BEGIN_FTR_SECTION
/*
* POWER9 DD2 can incorrectly set PMAO when waking up after a
* state-loss idle. Saving and restoring MMCR0 over idle is a
@ -357,6 +363,7 @@ power_enter_stop:
*/
mfspr r4,SPRN_MMCR0
std r4,_MMCR0(r1)
END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1 | CPU_FTR_POWER9_DD20)
/*
* Check if the requested state is a deep idle state.
@ -544,15 +551,15 @@ pnv_restore_hyp_resource_arch300:
blt cr3,1f
BEGIN_FTR_SECTION
PPC_INVALIDATE_ERAT
END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1 | CPU_FTR_POWER9_DD20)
ld r1,PACAR1(r13)
ld r4,_MMCR0(r1)
mtspr SPRN_MMCR0,r4
END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1 | CPU_FTR_POWER9_DD20)
mfspr r4,SPRN_MMCRA
ori r4,r4,(1 << (63-60))
mtspr SPRN_MMCRA,r4
xori r4,r4,(1 << (63-60))
mtspr SPRN_MMCRA,r4
ld r4,_MMCR0(r1)
mtspr SPRN_MMCR0,r4
1:
/*
* POWER ISA 3. Use PSSCR to determine if we