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powerpc/64s: Simplify POWER9 DD1 idle workaround code

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The idle workaround does not need to load PACATOC, and it does not
need to be called within a nested function that requires LR to be
saved.

Load the PACATOC at entry to the idle wakeup. It does not matter which
PACA this comes from, so it's okay to call before the workaround. Then
apply the workaround to get the right PACA.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-04-19 23:05:51 +10:00 committed by Michael Ellerman
parent 0d7720a242
commit 9cba253df4
2 changed files with 8 additions and 11 deletions
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3
arch/powerpc/include/asm/feature-fixups.h
View File

@ -66,6 +66,9 @@ label##5: \
#define END_FTR_SECTION(msk, val) \
END_FTR_SECTION_NESTED(msk, val, 97)
#define END_FTR_SECTION_NESTED_IFSET(msk, label) \
END_FTR_SECTION_NESTED((msk), (msk), label)
#define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk))
#define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0)

16
arch/powerpc/kernel/idle_book3s.S
View File

@ -411,7 +411,6 @@ power9_dd1_recover_paca:
/* Load paca->thread_sibling_pacas[i] into r13 */
ldx r13, r4, r5
SET_PACA(r13)
ld r2, PACATOC(r13)
/*
* Indicate that we have lost NVGPR state
* which needs to be restored from the stack.
@ -451,7 +450,12 @@ pnv_powersave_wakeup_mce:
*/
.global pnv_powersave_wakeup
pnv_powersave_wakeup:
ld r2, PACATOC(r13)
BEGIN_FTR_SECTION
BEGIN_FTR_SECTION_NESTED(70)
bl power9_dd1_recover_paca
END_FTR_SECTION_NESTED_IFSET(CPU_FTR_POWER9_DD1, 70)
bl pnv_restore_hyp_resource_arch300
FTR_SECTION_ELSE
bl pnv_restore_hyp_resource_arch207
@ -488,14 +492,6 @@ pnv_restore_hyp_resource_arch300:
* POWER ISA 3. Use PSSCR to determine if we
* are waking up from deep idle state
*/
BEGIN_FTR_SECTION
mflr r6
bl power9_dd1_recover_paca
mtlr r6
FTR_SECTION_ELSE
ld r2, PACATOC(r13)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_POWER9_DD1)
LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state)
ld r4,ADDROFF(pnv_first_deep_stop_state)(r5)
@ -516,8 +512,6 @@ pnv_restore_hyp_resource_arch207:
* POWER ISA 2.07 or less.
* Check if we slept with sleep or winkle.
*/
ld r2,PACATOC(r13);
lbz r4,PACA_THREAD_IDLE_STATE(r13)
cmpwi cr2,r4,PNV_THREAD_NAP
bgt cr2,pnv_wakeup_tb_loss /* Either sleep or Winkle */