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powerpc/64s/idle: POWER9 implement a separate idle stop function for hotplug

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Implement a new function to invoke stop, power9_offline_stop, which is
like power9_idle_stop but used by the cpu hotplug code.

Move KVM secondary state manipulation code to the offline case.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-11-18 00:08:05 +10:00 committed by Michael Ellerman
parent d40b6768e4
commit 3d4fbffdd7
3 changed files with 20 additions and 7 deletions
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1
arch/powerpc/include/asm/processor.h
View File

@ -518,6 +518,7 @@ extern int powersave_nap; /* set if nap mode can be used in idle loop */
extern unsigned long power7_idle_insn(unsigned long type); /* PNV_THREAD_NAP/etc*/
extern void power7_idle_type(unsigned long type);
extern unsigned long power9_idle_stop(unsigned long psscr_val);
extern unsigned long power9_offline_stop(unsigned long psscr_val);
extern void power9_idle_type(unsigned long stop_psscr_val,
unsigned long stop_psscr_mask);

24
arch/powerpc/kernel/idle_book3s.S
View File

@ -325,12 +325,6 @@ enter_winkle:
* r3 - PSSCR value corresponding to the requested stop state.
*/
power_enter_stop:
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
/* Tell KVM we're entering idle */
li r4,KVM_HWTHREAD_IN_IDLE
/* DO THIS IN REAL MODE! See comment above. */
stb r4,HSTATE_HWTHREAD_STATE(r13)
#endif
/*
* Check if we are executing the lite variant with ESL=EC=0
*/
@ -425,6 +419,24 @@ ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66); \
ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \
20: nop;
/*
* Entered with MSR[EE]=0 and no soft-masked interrupts pending.
* r3 contains desired PSSCR register value.
*/
_GLOBAL(power9_offline_stop)
std r3, PACA_REQ_PSSCR(r13)
mtspr SPRN_PSSCR,r3
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
/* Tell KVM we're entering idle */
li r4,KVM_HWTHREAD_IN_IDLE
/* DO THIS IN REAL MODE! See comment above. */
stb r4,HSTATE_HWTHREAD_STATE(r13)
#endif
LOAD_REG_ADDR(r4,power_enter_stop)
b pnv_powersave_common
/* No return */
/*
* Entered with MSR[EE]=0 and no soft-masked interrupts pending.
* r3 contains desired PSSCR register value.

2
arch/powerpc/platforms/powernv/idle.c
View File

@ -511,7 +511,7 @@ unsigned long pnv_cpu_offline(unsigned int cpu)
psscr = mfspr(SPRN_PSSCR);
psscr = (psscr & ~pnv_deepest_stop_psscr_mask) |
pnv_deepest_stop_psscr_val;
srr1 = power9_idle_stop(psscr);
srr1 = power9_offline_stop(psscr);
} else if ((idle_states & OPAL_PM_WINKLE_ENABLED) &&
(idle_states & OPAL_PM_LOSE_FULL_CONTEXT)) {