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powerpc/powernv: Make pnv_powersave_common more generic

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pnv_powersave_common does common steps needed before entering idle
state and eventually changes MSR to MSR_IDLE and does rfid to
pnv_enter_arch207_idle_mode.

Move the updation of HSTATE_HWTHREAD_STATE to pnv_powersave_common
from pnv_enter_arch207_idle_mode and make it more generic by passing the
rfid address as a function parameter.

Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Shreyas B. Prabhu 2016-07-08 11:50:47 +05:30 committed by Michael Ellerman
parent 5fa6b6bd7a
commit 4eae2c9ae5
1 changed files with 14 additions and 9 deletions
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23
arch/powerpc/kernel/idle_book3s.S
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@ -75,6 +75,8 @@ core_idle_lock_held:
* To check IRQ_HAPPENED in r4
* 0 - don't check
* 1 - check
*
* Address to 'rfid' to in r5
*/
_GLOBAL(pnv_powersave_common)
/* Use r3 to pass state nap/sleep/winkle */
@ -127,28 +129,28 @@ _GLOBAL(pnv_powersave_common)
std r9,_MSR(r1)
std r1,PACAR1(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
/* Tell KVM we're entering idle */
li r4,KVM_HWTHREAD_IN_NAP
stb r4,HSTATE_HWTHREAD_STATE(r13)
#endif
/*
* Go to real mode to do the nap, as required by the architecture.
* Also, we need to be in real mode before setting hwthread_state,
* because as soon as we do that, another thread can switch
* the MMU context to the guest.
*/
LOAD_REG_IMMEDIATE(r5, MSR_IDLE)
LOAD_REG_IMMEDIATE(r7, MSR_IDLE)
li r6, MSR_RI
andc r6, r9, r6
LOAD_REG_ADDR(r7, pnv_enter_arch207_idle_mode)
mtmsrd r6, 1 /* clear RI before setting SRR0/1 */
mtspr SPRN_SRR0, r7
mtspr SPRN_SRR1, r5
mtspr SPRN_SRR0, r5
mtspr SPRN_SRR1, r7
rfid
.globl pnv_enter_arch207_idle_mode
pnv_enter_arch207_idle_mode:
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
/* Tell KVM we're napping */
li r4,KVM_HWTHREAD_IN_NAP
stb r4,HSTATE_HWTHREAD_STATE(r13)
#endif
stb r3,PACA_THREAD_IDLE_STATE(r13)
cmpwi cr3,r3,PNV_THREAD_SLEEP
bge cr3,2f
@ -243,18 +245,21 @@ _GLOBAL(power7_idle)
_GLOBAL(power7_nap)
mr r4,r3
li r3,PNV_THREAD_NAP
LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
b pnv_powersave_common
/* No return */
_GLOBAL(power7_sleep)
li r3,PNV_THREAD_SLEEP
li r4,1
LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
b pnv_powersave_common
/* No return */
_GLOBAL(power7_winkle)
li r3,PNV_THREAD_WINKLE
li r4,1
LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
b pnv_powersave_common
/* No return */