diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv')
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 78 |
1 files changed, 77 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index 36c715102c58..4f4ec3797eb6 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -33,7 +33,14 @@ #include "powernv.h" -static void __devinit pnv_smp_setup_cpu(int cpu) +#ifdef DEBUG +#include <asm/udbg.h> +#define DBG(fmt...) udbg_printf(fmt) +#else +#define DBG(fmt...) +#endif + +static void __cpuinit pnv_smp_setup_cpu(int cpu) { if (cpu != boot_cpuid) xics_setup_cpu(); @@ -55,6 +62,67 @@ static int pnv_smp_cpu_bootable(unsigned int nr) return 1; } +#ifdef CONFIG_HOTPLUG_CPU + +static int pnv_smp_cpu_disable(void) +{ + int cpu = smp_processor_id(); + + /* This is identical to pSeries... might consolidate by + * moving migrate_irqs_away to a ppc_md with default to + * the generic fixup_irqs. --BenH. + */ + set_cpu_online(cpu, false); + vdso_data->processorCount--; + if (cpu == boot_cpuid) + boot_cpuid = cpumask_any(cpu_online_mask); + xics_migrate_irqs_away(); + return 0; +} + +static void pnv_smp_cpu_kill_self(void) +{ + unsigned int cpu; + + /* If powersave_nap is enabled, use NAP mode, else just + * spin aimlessly + */ + if (!powersave_nap) { + generic_mach_cpu_die(); + return; + } + + /* Standard hot unplug procedure */ + local_irq_disable(); + idle_task_exit(); + current->active_mm = NULL; /* for sanity */ + cpu = smp_processor_id(); + DBG("CPU%d offline\n", cpu); + generic_set_cpu_dead(cpu); + smp_wmb(); + + /* We don't want to take decrementer interrupts while we are offline, + * so clear LPCR:PECE1. We keep PECE2 enabled. + */ + mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~(u64)LPCR_PECE1); + while (!generic_check_cpu_restart(cpu)) { + power7_idle(); + if (!generic_check_cpu_restart(cpu)) { + DBG("CPU%d Unexpected exit while offline !\n", cpu); + /* We may be getting an IPI, so we re-enable + * interrupts to process it, it will be ignored + * since we aren't online (hopefully) + */ + local_irq_enable(); + local_irq_disable(); + } + } + mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_PECE1); + DBG("CPU%d coming online...\n", cpu); +} + +#endif /* CONFIG_HOTPLUG_CPU */ + static struct smp_ops_t pnv_smp_ops = { .message_pass = smp_muxed_ipi_message_pass, .cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */ @@ -62,6 +130,10 @@ static struct smp_ops_t pnv_smp_ops = { .kick_cpu = smp_generic_kick_cpu, .setup_cpu = pnv_smp_setup_cpu, .cpu_bootable = pnv_smp_cpu_bootable, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_disable = pnv_smp_cpu_disable, + .cpu_die = generic_cpu_die, +#endif /* CONFIG_HOTPLUG_CPU */ }; /* This is called very early during platform setup_arch */ @@ -80,4 +152,8 @@ void __init pnv_smp_init(void) smp_ops->take_timebase = rtas_take_timebase; } #endif /* CONFIG_PPC_RTAS */ + +#ifdef CONFIG_HOTPLUG_CPU + ppc_md.cpu_die = pnv_smp_cpu_kill_self; +#endif } |