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powerpc/powernv: Make it possible to skip the IRQHAPPENED check in power7_nap()

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To support split core we need to be able to force all secondaries into
nap, so the core can detect they are idle and do an unsplit.

Currently power7_nap() will return without napping if there is an irq
pending. We want to ignore the pending irq and nap anyway, we will deal
with the interrupt later.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman
2014-05-23 18:15:26 +10:00
committed by Benjamin Herrenschmidt
parent 441c19c8a2
commit 8d6f7c5aa3
3 changed files with 11 additions and 2 deletions
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9
arch/powerpc/kernel/idle_power7.S
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@@ -39,6 +39,10 @@
* Pass requested state in r3:
* 0 - nap
* 1 - sleep
*
* To check IRQ_HAPPENED in r4
* 0 - don't check
* 1 - check
*/
_GLOBAL(power7_powersave_common)
/* Use r3 to pass state nap/sleep/winkle */
@@ -71,6 +75,8 @@ _GLOBAL(power7_powersave_common)
lbz r0,PACAIRQHAPPENED(r13)
cmpwi cr0,r0,0
beq 1f
cmpwi cr0,r4,0
beq 1f
addi r1,r1,INT_FRAME_SIZE
ld r0,16(r1)
mtlr r0
@@ -114,15 +120,18 @@ _GLOBAL(power7_idle)
lwz r4,ADDROFF(powersave_nap)(r3)
cmpwi 0,r4,0
beqlr
li r3, 1
/* fall through */
_GLOBAL(power7_nap)
mr r4,r3
li r3,0
b power7_powersave_common
/* No return */
_GLOBAL(power7_sleep)
li r3,1
li r4,0
b power7_powersave_common
/* No return */