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powerpc/64s: Use alternative feature patching

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This reduces the number of nops for POWER8.

Reviewed-by: Gautham R. Shenoy <ego@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 2017-04-19 23:05:46 +10:00 committed by Michael Ellerman
parent 544686cae8
commit 10101aa9aa
1 changed files with 14 additions and 9 deletions
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23
arch/powerpc/kernel/idle_book3s.S
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@ -421,7 +421,11 @@ power9_dd1_recover_paca:
*/ */
.global pnv_powersave_wakeup .global pnv_powersave_wakeup
pnv_powersave_wakeup: pnv_powersave_wakeup:
bl pnv_restore_hyp_resource BEGIN_FTR_SECTION
bl pnv_restore_hyp_resource_arch300
FTR_SECTION_ELSE
bl pnv_restore_hyp_resource_arch207
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
li r0,PNV_THREAD_RUNNING li r0,PNV_THREAD_RUNNING
stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */ stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
@ -449,7 +453,11 @@ pnv_powersave_wakeup:
* *
* cr3 - set to gt if waking up with partial/complete hypervisor state loss * cr3 - set to gt if waking up with partial/complete hypervisor state loss
*/ */
pnv_restore_hyp_resource: pnv_restore_hyp_resource_arch300:
/*
* POWER ISA 3. Use PSSCR to determine if we
* are waking up from deep idle state
*/
BEGIN_FTR_SECTION BEGIN_FTR_SECTION
mflr r6 mflr r6
bl power9_dd1_recover_paca bl power9_dd1_recover_paca
@ -458,11 +466,6 @@ FTR_SECTION_ELSE
ld r2, PACATOC(r13) ld r2, PACATOC(r13)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_POWER9_DD1) ALT_FTR_SECTION_END_IFSET(CPU_FTR_POWER9_DD1)
BEGIN_FTR_SECTION
/*
* POWER ISA 3. Use PSSCR to determine if we
* are waking up from deep idle state
*/
LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state) LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state)
ld r4,ADDROFF(pnv_first_deep_stop_state)(r5) ld r4,ADDROFF(pnv_first_deep_stop_state)(r5)
@ -477,12 +480,14 @@ BEGIN_FTR_SECTION
blr /* Waking up without hypervisor state loss. */ blr /* Waking up without hypervisor state loss. */
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) /* Same calling convention as arch300 */
pnv_restore_hyp_resource_arch207:
/* /*
* POWER ISA 2.07 or less. * POWER ISA 2.07 or less.
* Check if we slept with winkle. * Check if we slept with winkle.
*/ */
ld r2,PACATOC(r13);
lbz r0,PACA_THREAD_IDLE_STATE(r13) lbz r0,PACA_THREAD_IDLE_STATE(r13)
cmpwi cr2,r0,PNV_THREAD_NAP cmpwi cr2,r0,PNV_THREAD_NAP
cmpwi cr4,r0,PNV_THREAD_WINKLE cmpwi cr4,r0,PNV_THREAD_WINKLE