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| author | Michael Ellerman <mpe@ellerman.id.au> | 2014-05-23 18:15:26 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-28 13:35:35 +1000 |
| commit | 8d6f7c5aa3db6f3e5e43d09f8a0166c7d96f33f3 (patch) | |
| tree | abde7ff85f8eb47d7c028228101c0fd3880bb0fa /arch/powerpc/kernel/idle_power7.S | |
| parent | 441c19c8a290f5f1e1b263691641124c84232b6e (diff) | |
| download | linux-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.S | 9 |
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 */ |