diff options
| author | Tony Breeds <tony@bakeyournoodle.com> | 2008-04-24 07:43:49 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-24 14:58:03 +0400 |
| commit | 9cb82f2f4692293a27c578c3038518ce4477de72 (patch) | |
| tree | 77626f4d774fc6a9414965b69c37af472f814b15 /arch/powerpc | |
| parent | 4ae2dcb633c751cfd27deeea5a8b13db35a84d9a (diff) | |
| download | linux-9cb82f2f4692293a27c578c3038518ce4477de72.tar.xz | |
[POWERPC] Make iSeries spin on __secondary_hold_spinloop, like pSeries
Currently all iSeries secondary CPUs spin directly on the cpu_start
field in their paca. Make them spin on the global
__secondary_hold_spinloop until after the pacas have been initialised.
As Stephen Rothwell points out, this works at the moment because
__secondary_hold_spinloop is being set already, but iSeries isn't
looking at it :)
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/iseries/exception.S | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S index c775cd4b3d6e..8ff330d026ca 100644 --- a/arch/powerpc/platforms/iseries/exception.S +++ b/arch/powerpc/platforms/iseries/exception.S @@ -59,8 +59,33 @@ system_reset_iSeries: andc r4,r4,r5 mtspr SPRN_CTRLT,r4 +/* Spin on __secondary_hold_spinloop until it is updated by the boot cpu. */ +/* In the UP case we'll yeild() later, and we will not access the paca anyway */ +#ifdef CONFIG_SMP 1: HMT_LOW + LOAD_REG_IMMEDIATE(r23, __secondary_hold_spinloop) + ld r23,0(r23) + sync + LOAD_REG_IMMEDIATE(r3,current_set) + sldi r28,r24,3 /* get current_set[cpu#] */ + ldx r3,r3,r28 + addi r1,r3,THREAD_SIZE + subi r1,r1,STACK_FRAME_OVERHEAD + + cmpwi 0,r23,0 /* Keep poking the Hypervisor until */ + bne 2f /* we're released */ + /* Let the Hypervisor know we are alive */ + /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ + lis r3,0x8002 + rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ + li r0,-1 /* r0=-1 indicates a Hypervisor call */ + sc /* Invoke the hypervisor via a system call */ + b 1b +#endif + +2: + HMT_LOW #ifdef CONFIG_SMP lbz r23,PACAPROCSTART(r13) /* Test if this processor * should start */ @@ -91,7 +116,7 @@ iSeries_secondary_smp_loop: li r0,-1 /* r0=-1 indicates a Hypervisor call */ sc /* Invoke the hypervisor via a system call */ mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */ - b 1b /* If SMP not configured, secondaries + b 2b /* If SMP not configured, secondaries * loop forever */ /*** ISeries-LPAR interrupt handlers ***/ |