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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-02-21 16:49:58 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-01 15:37:25 +1100 |
| commit | 62cc67b9df273be18fcb09a071592dedf751c90a (patch) | |
| tree | 604363a8a8ea577b59c58e10ba7cf36a67ced624 /arch/powerpc/kernel | |
| parent | e872e41b79f61dbc22f85577613925a4a7de1c1a (diff) | |
| download | linux-62cc67b9df273be18fcb09a071592dedf751c90a.tar.bz2 | |
powerpc/pmac/smp: Properly NAP offlined CPU on G5
The current code soft-disables, and then goes to NAP mode which
turns interrupts on. That means that if an interrupt occurs, we
will hit the masked interrupt code path which isn't what we want,
as it will return with EE off, which will either get us out of
NAP mode, or fail to enter it (according to spec).
Instead, let's just rely on the fact that it is safe to take
decrementer interrupts on an offline CPU and leave interrupts
enabled. We can also get rid of the special case in asm for
power4_cpu_offline_powersave() and just use power4_idle().
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_power4.S | 21 |
2 files changed, 7 insertions, 21 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 782f23df7c85..271140b38b6f 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -536,6 +536,13 @@ _GLOBAL(pmac_secondary_start) add r13,r13,r4 /* for this processor. */ mtspr SPRN_SPRG_PACA,r13 /* Save vaddr of paca in an SPRG*/ + /* Mark interrupts soft and hard disabled (they might be enabled + * in the PACA when doing hotplug) + */ + li r0,0 + stb r0,PACASOFTIRQEN(r13) + stb r0,PACAHARDIRQEN(r13) + /* Create a temp kernel stack for use before relocation is on. */ ld r1,PACAEMERGSP(r13) subi r1,r1,STACK_FRAME_OVERHEAD diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S index 5328709eeedc..ba3195478600 100644 --- a/arch/powerpc/kernel/idle_power4.S +++ b/arch/powerpc/kernel/idle_power4.S @@ -53,24 +53,3 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) isync b 1b -_GLOBAL(power4_cpu_offline_powersave) - /* Go to NAP now */ - mfmsr r7 - rldicl r0,r7,48,1 - rotldi r0,r0,16 - mtmsrd r0,1 /* hard-disable interrupts */ - li r0,1 - li r6,0 - stb r0,PACAHARDIRQEN(r13) /* we'll hard-enable shortly */ - stb r6,PACASOFTIRQEN(r13) /* soft-disable irqs */ -BEGIN_FTR_SECTION - DSSALL - sync -END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) - ori r7,r7,MSR_EE - oris r7,r7,MSR_POW@h - sync - isync - mtmsrd r7 - isync - blr |