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authorMichael Ellerman <mpe@ellerman.id.au>2014-05-23 18:15:26 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-05-28 13:35:35 +1000
commit8d6f7c5aa3db6f3e5e43d09f8a0166c7d96f33f3 (patch)
treeabde7ff85f8eb47d7c028228101c0fd3880bb0fa /arch/powerpc/kernel/idle_power7.S
parent441c19c8a290f5f1e1b263691641124c84232b6e (diff)
downloadlinux-8d6f7c5aa3db6f3e5e43d09f8a0166c7d96f33f3.tar.bz2
powerpc/powernv: Make it possible to skip the IRQHAPPENED check in power7_nap()
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>
Diffstat (limited to 'arch/powerpc/kernel/idle_power7.S')
-rw-r--r--arch/powerpc/kernel/idle_power7.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S
index dca6e16c2436..2480256272d4 100644
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -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 */