From 094fe2e712f38f49bf79ef93306c61b1b993b07b Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 10 Nov 2005 14:26:12 +1100 Subject: [PATCH] powerpc: Fixes for 32-bit powermac SMP A couple of bugs crept in with the merge of smp.c... Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/smp.c | 8 +++-- arch/powerpc/platforms/powermac/smp.c | 51 ++++++++++++++++----------- 2 files changed, 37 insertions(+), 22 deletions(-) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 7fd530898bd..2ffdc863bff 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -369,11 +369,11 @@ int generic_cpu_disable(void) if (cpu == boot_cpuid) return -EBUSY; + cpu_clear(cpu, cpu_online_map); #ifdef CONFIG_PPC64 _systemcfg->processorCount--; -#endif - cpu_clear(cpu, cpu_online_map); fixup_irqs(cpu_online_map); +#endif return 0; } @@ -391,9 +391,11 @@ int generic_cpu_enable(unsigned int cpu) while (!cpu_online(cpu)) cpu_relax(); +#ifdef CONFIG_PPC64 fixup_irqs(cpu_online_map); /* counter the irq disable in fixup_irqs */ local_irq_enable(); +#endif return 0; } @@ -422,7 +424,9 @@ void generic_mach_cpu_die(void) while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) cpu_relax(); +#ifdef CONFIG_PPC64 flush_tlb_pending(); +#endif cpu_set(cpu, cpu_online_map); local_irq_enable(); } diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c index e1f9443cc87..957b0910342 100644 --- a/arch/powerpc/platforms/powermac/smp.c +++ b/arch/powerpc/platforms/powermac/smp.c @@ -305,9 +305,19 @@ static int __init smp_psurge_probe(void) psurge_start = ioremap(PSURGE_START, 4); psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4); - /* this is not actually strictly necessary -- paulus. */ - for (i = 1; i < ncpus; ++i) - smp_hw_index[i] = i; + /* + * This is necessary because OF doesn't know about the + * secondary cpu(s), and thus there aren't nodes in the + * device tree for them, and smp_setup_cpu_maps hasn't + * set their bits in cpu_possible_map and cpu_present_map. + */ + if (ncpus > NR_CPUS) + ncpus = NR_CPUS; + for (i = 1; i < ncpus ; ++i) { + cpu_set(i, cpu_present_map); + cpu_set(i, cpu_possible_map); + set_hard_smp_processor_id(i, i); + } if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352); @@ -348,6 +358,7 @@ static void __init psurge_dual_sync_tb(int cpu_nr) int t; set_dec(tb_ticks_per_jiffy); + /* XXX fixme */ set_tb(0, 0); last_jiffy_stamp(cpu_nr) = 0; @@ -363,8 +374,6 @@ static void __init psurge_dual_sync_tb(int cpu_nr) /* now interrupt the secondary, starting both TBs */ psurge_set_ipi(1); - - smp_tb_synchronized = 1; } static struct irqaction psurge_irqaction = { @@ -625,9 +634,8 @@ void smp_core99_give_timebase(void) for (t = 100000; t > 0 && sec_tb_reset; --t) udelay(10); if (sec_tb_reset) + /* XXX BUG_ON here? */ printk(KERN_WARNING "Timeout waiting sync(2) on second CPU\n"); - else - smp_tb_synchronized = 1; /* Now, restart the timebase by leaving the GPIO to an open collector */ pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0); @@ -810,19 +818,9 @@ static void __devinit smp_core99_setup_cpu(int cpu_nr) } -/* Core99 Macs (dual G4s and G5s) */ -struct smp_ops_t core99_smp_ops = { - .message_pass = smp_mpic_message_pass, - .probe = smp_core99_probe, - .kick_cpu = smp_core99_kick_cpu, - .setup_cpu = smp_core99_setup_cpu, - .give_timebase = smp_core99_give_timebase, - .take_timebase = smp_core99_take_timebase, -}; - #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32) -int __cpu_disable(void) +int smp_core99_cpu_disable(void) { cpu_clear(smp_processor_id(), cpu_online_map); @@ -846,7 +844,7 @@ void cpu_die(void) low_cpu_die(); } -void __cpu_die(unsigned int cpu) +void smp_core99_cpu_die(unsigned int cpu) { int timeout; @@ -858,8 +856,21 @@ void __cpu_die(unsigned int cpu) } msleep(1); } - cpu_callin_map[cpu] = 0; cpu_dead[cpu] = 0; } #endif + +/* Core99 Macs (dual G4s and G5s) */ +struct smp_ops_t core99_smp_ops = { + .message_pass = smp_mpic_message_pass, + .probe = smp_core99_probe, + .kick_cpu = smp_core99_kick_cpu, + .setup_cpu = smp_core99_setup_cpu, + .give_timebase = smp_core99_give_timebase, + .take_timebase = smp_core99_take_timebase, +#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32) + .cpu_disable = smp_core99_cpu_disable, + .cpu_die = smp_core99_cpu_die, +#endif +}; -- 2.41.1