| /* |
| * SMP support for ppc. |
| * |
| * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great |
| * deal of code from the sparc and intel versions. |
| * |
| * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> |
| * |
| * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and |
| * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #undef DEBUG |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/sched/mm.h> |
| #include <linux/sched/topology.h> |
| #include <linux/smp.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/cache.h> |
| #include <linux/err.h> |
| #include <linux/device.h> |
| #include <linux/cpu.h> |
| #include <linux/notifier.h> |
| #include <linux/topology.h> |
| #include <linux/profile.h> |
| |
| #include <asm/ptrace.h> |
| #include <linux/atomic.h> |
| #include <asm/irq.h> |
| #include <asm/hw_irq.h> |
| #include <asm/kvm_ppc.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/prom.h> |
| #include <asm/smp.h> |
| #include <asm/time.h> |
| #include <asm/machdep.h> |
| #include <asm/cputhreads.h> |
| #include <asm/cputable.h> |
| #include <asm/mpic.h> |
| #include <asm/vdso_datapage.h> |
| #ifdef CONFIG_PPC64 |
| #include <asm/paca.h> |
| #endif |
| #include <asm/vdso.h> |
| #include <asm/debug.h> |
| #include <asm/kexec.h> |
| #include <asm/asm-prototypes.h> |
| #include <asm/cpu_has_feature.h> |
| |
| #ifdef DEBUG |
| #include <asm/udbg.h> |
| #define DBG(fmt...) udbg_printf(fmt) |
| #else |
| #define DBG(fmt...) |
| #endif |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| /* State of each CPU during hotplug phases */ |
| static DEFINE_PER_CPU(int, cpu_state) = { 0 }; |
| #endif |
| |
| struct thread_info *secondary_ti; |
| |
| DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); |
| DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); |
| |
| EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
| EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
| |
| /* SMP operations for this machine */ |
| struct smp_ops_t *smp_ops; |
| |
| /* Can't be static due to PowerMac hackery */ |
| volatile unsigned int cpu_callin_map[NR_CPUS]; |
| |
| int smt_enabled_at_boot = 1; |
| |
| static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
| |
| /* |
| * Returns 1 if the specified cpu should be brought up during boot. |
| * Used to inhibit booting threads if they've been disabled or |
| * limited on the command line |
| */ |
| int smp_generic_cpu_bootable(unsigned int nr) |
| { |
| /* Special case - we inhibit secondary thread startup |
| * during boot if the user requests it. |
| */ |
| if (system_state == SYSTEM_BOOTING && cpu_has_feature(CPU_FTR_SMT)) { |
| if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) |
| return 0; |
| if (smt_enabled_at_boot |
| && cpu_thread_in_core(nr) >= smt_enabled_at_boot) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| |
| #ifdef CONFIG_PPC64 |
| int smp_generic_kick_cpu(int nr) |
| { |
| BUG_ON(nr < 0 || nr >= NR_CPUS); |
| |
| /* |
| * The processor is currently spinning, waiting for the |
| * cpu_start field to become non-zero After we set cpu_start, |
| * the processor will continue on to secondary_start |
| */ |
| if (!paca[nr].cpu_start) { |
| paca[nr].cpu_start = 1; |
| smp_mb(); |
| return 0; |
| } |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| /* |
| * Ok it's not there, so it might be soft-unplugged, let's |
| * try to bring it back |
| */ |
| generic_set_cpu_up(nr); |
| smp_wmb(); |
| smp_send_reschedule(nr); |
| #endif /* CONFIG_HOTPLUG_CPU */ |
| |
| return 0; |
| } |
| #endif /* CONFIG_PPC64 */ |
| |
| static irqreturn_t call_function_action(int irq, void *data) |
| { |
| generic_smp_call_function_interrupt(); |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t reschedule_action(int irq, void *data) |
| { |
| scheduler_ipi(); |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t tick_broadcast_ipi_action(int irq, void *data) |
| { |
| tick_broadcast_ipi_handler(); |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t debug_ipi_action(int irq, void *data) |
| { |
| if (crash_ipi_function_ptr) { |
| crash_ipi_function_ptr(get_irq_regs()); |
| return IRQ_HANDLED; |
| } |
| |
| #ifdef CONFIG_DEBUGGER |
| debugger_ipi(get_irq_regs()); |
| #endif /* CONFIG_DEBUGGER */ |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irq_handler_t smp_ipi_action[] = { |
| [PPC_MSG_CALL_FUNCTION] = call_function_action, |
| [PPC_MSG_RESCHEDULE] = reschedule_action, |
| [PPC_MSG_TICK_BROADCAST] = tick_broadcast_ipi_action, |
| [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, |
| }; |
| |
| const char *smp_ipi_name[] = { |
| [PPC_MSG_CALL_FUNCTION] = "ipi call function", |
| [PPC_MSG_RESCHEDULE] = "ipi reschedule", |
| [PPC_MSG_TICK_BROADCAST] = "ipi tick-broadcast", |
| [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", |
| }; |
| |
| /* optional function to request ipi, for controllers with >= 4 ipis */ |
| int smp_request_message_ipi(int virq, int msg) |
| { |
| int err; |
| |
| if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { |
| return -EINVAL; |
| } |
| #if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC_CORE) |
| if (msg == PPC_MSG_DEBUGGER_BREAK) { |
| return 1; |
| } |
| #endif |
| err = request_irq(virq, smp_ipi_action[msg], |
| IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND, |
| smp_ipi_name[msg], NULL); |
| WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", |
| virq, smp_ipi_name[msg], err); |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_PPC_SMP_MUXED_IPI |
| struct cpu_messages { |
| long messages; /* current messages */ |
| unsigned long data; /* data for cause ipi */ |
| }; |
| static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); |
| |
| void smp_muxed_ipi_set_data(int cpu, unsigned long data) |
| { |
| struct cpu_messages *info = &per_cpu(ipi_message, cpu); |
| |
| info->data = data; |
| } |
| |
| void smp_muxed_ipi_set_message(int cpu, int msg) |
| { |
| struct cpu_messages *info = &per_cpu(ipi_message, cpu); |
| char *message = (char *)&info->messages; |
| |
| /* |
| * Order previous accesses before accesses in the IPI handler. |
| */ |
| smp_mb(); |
| message[msg] = 1; |
| } |
| |
| void smp_muxed_ipi_message_pass(int cpu, int msg) |
| { |
| struct cpu_messages *info = &per_cpu(ipi_message, cpu); |
| |
| smp_muxed_ipi_set_message(cpu, msg); |
| /* |
| * cause_ipi functions are required to include a full barrier |
| * before doing whatever causes the IPI. |
| */ |
| smp_ops->cause_ipi(cpu, info->data); |
| } |
| |
| #ifdef __BIG_ENDIAN__ |
| #define IPI_MESSAGE(A) (1uL << ((BITS_PER_LONG - 8) - 8 * (A))) |
| #else |
| #define IPI_MESSAGE(A) (1uL << (8 * (A))) |
| #endif |
| |
| irqreturn_t smp_ipi_demux(void) |
| { |
| struct cpu_messages *info = this_cpu_ptr(&ipi_message); |
| unsigned long all; |
| |
| mb(); /* order any irq clear */ |
| |
| do { |
| all = xchg(&info->messages, 0); |
| #if defined(CONFIG_KVM_XICS) && defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) |
| /* |
| * Must check for PPC_MSG_RM_HOST_ACTION messages |
| * before PPC_MSG_CALL_FUNCTION messages because when |
| * a VM is destroyed, we call kick_all_cpus_sync() |
| * to ensure that any pending PPC_MSG_RM_HOST_ACTION |
| * messages have completed before we free any VCPUs. |
| */ |
| if (all & IPI_MESSAGE(PPC_MSG_RM_HOST_ACTION)) |
| kvmppc_xics_ipi_action(); |
| #endif |
| if (all & IPI_MESSAGE(PPC_MSG_CALL_FUNCTION)) |
| generic_smp_call_function_interrupt(); |
| if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE)) |
| scheduler_ipi(); |
| if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST)) |
| tick_broadcast_ipi_handler(); |
| if (all & IPI_MESSAGE(PPC_MSG_DEBUGGER_BREAK)) |
| debug_ipi_action(0, NULL); |
| } while (info->messages); |
| |
| return IRQ_HANDLED; |
| } |
| #endif /* CONFIG_PPC_SMP_MUXED_IPI */ |
| |
| static inline void do_message_pass(int cpu, int msg) |
| { |
| if (smp_ops->message_pass) |
| smp_ops->message_pass(cpu, msg); |
| #ifdef CONFIG_PPC_SMP_MUXED_IPI |
| else |
| smp_muxed_ipi_message_pass(cpu, msg); |
| #endif |
| } |
| |
| void smp_send_reschedule(int cpu) |
| { |
| if (likely(smp_ops)) |
| do_message_pass(cpu, PPC_MSG_RESCHEDULE); |
| } |
| EXPORT_SYMBOL_GPL(smp_send_reschedule); |
| |
| void arch_send_call_function_single_ipi(int cpu) |
| { |
| do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
| } |
| |
| void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| { |
| unsigned int cpu; |
| |
| for_each_cpu(cpu, mask) |
| do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
| } |
| |
| #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
| void tick_broadcast(const struct cpumask *mask) |
| { |
| unsigned int cpu; |
| |
| for_each_cpu(cpu, mask) |
| do_message_pass(cpu, PPC_MSG_TICK_BROADCAST); |
| } |
| #endif |
| |
| #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE) |
| void smp_send_debugger_break(void) |
| { |
| int cpu; |
| int me = raw_smp_processor_id(); |
| |
| if (unlikely(!smp_ops)) |
| return; |
| |
| for_each_online_cpu(cpu) |
| if (cpu != me) |
| do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
| } |
| #endif |
| |
| #ifdef CONFIG_KEXEC_CORE |
| void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) |
| { |
| crash_ipi_function_ptr = crash_ipi_callback; |
| if (crash_ipi_callback) { |
| mb(); |
| smp_send_debugger_break(); |
| } |
| } |
| #endif |
| |
| static void stop_this_cpu(void *dummy) |
| { |
| /* Remove this CPU */ |
| set_cpu_online(smp_processor_id(), false); |
| |
| local_irq_disable(); |
| while (1) |
| ; |
| } |
| |
| void smp_send_stop(void) |
| { |
| smp_call_function(stop_this_cpu, NULL, 0); |
| } |
| |
| struct thread_info *current_set[NR_CPUS]; |
| |
| static void smp_store_cpu_info(int id) |
| { |
| per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); |
| #ifdef CONFIG_PPC_FSL_BOOK3E |
| per_cpu(next_tlbcam_idx, id) |
| = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; |
| #endif |
| } |
| |
| void __init smp_prepare_cpus(unsigned int max_cpus) |
| { |
| unsigned int cpu; |
| |
| DBG("smp_prepare_cpus\n"); |
| |
| /* |
| * setup_cpu may need to be called on the boot cpu. We havent |
| * spun any cpus up but lets be paranoid. |
| */ |
| BUG_ON(boot_cpuid != smp_processor_id()); |
| |
| /* Fixup boot cpu */ |
| smp_store_cpu_info(boot_cpuid); |
| cpu_callin_map[boot_cpuid] = 1; |
| |
| for_each_possible_cpu(cpu) { |
| zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), |
| GFP_KERNEL, cpu_to_node(cpu)); |
| zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), |
| GFP_KERNEL, cpu_to_node(cpu)); |
| /* |
| * numa_node_id() works after this. |
| */ |
| if (cpu_present(cpu)) { |
| set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]); |
| set_cpu_numa_mem(cpu, |
| local_memory_node(numa_cpu_lookup_table[cpu])); |
| } |
| } |
| |
| cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); |
| cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); |
| |
| if (smp_ops && smp_ops->probe) |
| smp_ops->probe(); |
| } |
| |
| void smp_prepare_boot_cpu(void) |
| { |
| BUG_ON(smp_processor_id() != boot_cpuid); |
| #ifdef CONFIG_PPC64 |
| paca[boot_cpuid].__current = current; |
| #endif |
| set_numa_node(numa_cpu_lookup_table[boot_cpuid]); |
| current_set[boot_cpuid] = task_thread_info(current); |
| } |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| |
| int generic_cpu_disable(void) |
| { |
| unsigned int cpu = smp_processor_id(); |
| |
| if (cpu == boot_cpuid) |
| return -EBUSY; |
| |
| set_cpu_online(cpu, false); |
| #ifdef CONFIG_PPC64 |
| vdso_data->processorCount--; |
| #endif |
| migrate_irqs(); |
| return 0; |
| } |
| |
| void generic_cpu_die(unsigned int cpu) |
| { |
| int i; |
| |
| for (i = 0; i < 100; i++) { |
| smp_rmb(); |
| if (is_cpu_dead(cpu)) |
| return; |
| msleep(100); |
| } |
| printk(KERN_ERR "CPU%d didn't die...\n", cpu); |
| } |
| |
| void generic_set_cpu_dead(unsigned int cpu) |
| { |
| per_cpu(cpu_state, cpu) = CPU_DEAD; |
| } |
| |
| /* |
| * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise |
| * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(), |
| * which makes the delay in generic_cpu_die() not happen. |
| */ |
| void generic_set_cpu_up(unsigned int cpu) |
| { |
| per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
| } |
| |
| int generic_check_cpu_restart(unsigned int cpu) |
| { |
| return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE; |
| } |
| |
| int is_cpu_dead(unsigned int cpu) |
| { |
| return per_cpu(cpu_state, cpu) == CPU_DEAD; |
| } |
| |
| static bool secondaries_inhibited(void) |
| { |
| return kvm_hv_mode_active(); |
| } |
| |
| #else /* HOTPLUG_CPU */ |
| |
| #define secondaries_inhibited() 0 |
| |
| #endif |
| |
| static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle) |
| { |
| struct thread_info *ti = task_thread_info(idle); |
| |
| #ifdef CONFIG_PPC64 |
| paca[cpu].__current = idle; |
| paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD; |
| #endif |
| ti->cpu = cpu; |
| secondary_ti = current_set[cpu] = ti; |
| } |
| |
| int __cpu_up(unsigned int cpu, struct task_struct *tidle) |
| { |
| int rc, c; |
| |
| /* |
| * Don't allow secondary threads to come online if inhibited |
| */ |
| if (threads_per_core > 1 && secondaries_inhibited() && |
| cpu_thread_in_subcore(cpu)) |
| return -EBUSY; |
| |
| if (smp_ops == NULL || |
| (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) |
| return -EINVAL; |
| |
| cpu_idle_thread_init(cpu, tidle); |
| |
| /* Make sure callin-map entry is 0 (can be leftover a CPU |
| * hotplug |
| */ |
| cpu_callin_map[cpu] = 0; |
| |
| /* The information for processor bringup must |
| * be written out to main store before we release |
| * the processor. |
| */ |
| smp_mb(); |
| |
| /* wake up cpus */ |
| DBG("smp: kicking cpu %d\n", cpu); |
| rc = smp_ops->kick_cpu(cpu); |
| if (rc) { |
| pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); |
| return rc; |
| } |
| |
| /* |
| * wait to see if the cpu made a callin (is actually up). |
| * use this value that I found through experimentation. |
| * -- Cort |
| */ |
| if (system_state < SYSTEM_RUNNING) |
| for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
| udelay(100); |
| #ifdef CONFIG_HOTPLUG_CPU |
| else |
| /* |
| * CPUs can take much longer to come up in the |
| * hotplug case. Wait five seconds. |
| */ |
| for (c = 5000; c && !cpu_callin_map[cpu]; c--) |
| msleep(1); |
| #endif |
| |
| if (!cpu_callin_map[cpu]) { |
| printk(KERN_ERR "Processor %u is stuck.\n", cpu); |
| return -ENOENT; |
| } |
| |
| DBG("Processor %u found.\n", cpu); |
| |
| if (smp_ops->give_timebase) |
| smp_ops->give_timebase(); |
| |
| /* Wait until cpu puts itself in the online & active maps */ |
| while (!cpu_online(cpu)) |
| cpu_relax(); |
| |
| return 0; |
| } |
| |
| /* Return the value of the reg property corresponding to the given |
| * logical cpu. |
| */ |
| int cpu_to_core_id(int cpu) |
| { |
| struct device_node *np; |
| const __be32 *reg; |
| int id = -1; |
| |
| np = of_get_cpu_node(cpu, NULL); |
| if (!np) |
| goto out; |
| |
| reg = of_get_property(np, "reg", NULL); |
| if (!reg) |
| goto out; |
| |
| id = be32_to_cpup(reg); |
| out: |
| of_node_put(np); |
| return id; |
| } |
| EXPORT_SYMBOL_GPL(cpu_to_core_id); |
| |
| /* Helper routines for cpu to core mapping */ |
| int cpu_core_index_of_thread(int cpu) |
| { |
| return cpu >> threads_shift; |
| } |
| EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); |
| |
| int cpu_first_thread_of_core(int core) |
| { |
| return core << threads_shift; |
| } |
| EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); |
| |
| static void traverse_siblings_chip_id(int cpu, bool add, int chipid) |
| { |
| const struct cpumask *mask; |
| struct device_node *np; |
| int i, plen; |
| const __be32 *prop; |
| |
| mask = add ? cpu_online_mask : cpu_present_mask; |
| for_each_cpu(i, mask) { |
| np = of_get_cpu_node(i, NULL); |
| if (!np) |
| continue; |
| prop = of_get_property(np, "ibm,chip-id", &plen); |
| if (prop && plen == sizeof(int) && |
| of_read_number(prop, 1) == chipid) { |
| if (add) { |
| cpumask_set_cpu(cpu, cpu_core_mask(i)); |
| cpumask_set_cpu(i, cpu_core_mask(cpu)); |
| } else { |
| cpumask_clear_cpu(cpu, cpu_core_mask(i)); |
| cpumask_clear_cpu(i, cpu_core_mask(cpu)); |
| } |
| } |
| of_node_put(np); |
| } |
| } |
| |
| /* Must be called when no change can occur to cpu_present_mask, |
| * i.e. during cpu online or offline. |
| */ |
| static struct device_node *cpu_to_l2cache(int cpu) |
| { |
| struct device_node *np; |
| struct device_node *cache; |
| |
| if (!cpu_present(cpu)) |
| return NULL; |
| |
| np = of_get_cpu_node(cpu, NULL); |
| if (np == NULL) |
| return NULL; |
| |
| cache = of_find_next_cache_node(np); |
| |
| of_node_put(np); |
| |
| return cache; |
| } |
| |
| static void traverse_core_siblings(int cpu, bool add) |
| { |
| struct device_node *l2_cache, *np; |
| const struct cpumask *mask; |
| int i, chip, plen; |
| const __be32 *prop; |
| |
| /* First see if we have ibm,chip-id properties in cpu nodes */ |
| np = of_get_cpu_node(cpu, NULL); |
| if (np) { |
| chip = -1; |
| prop = of_get_property(np, "ibm,chip-id", &plen); |
| if (prop && plen == sizeof(int)) |
| chip = of_read_number(prop, 1); |
| of_node_put(np); |
| if (chip >= 0) { |
| traverse_siblings_chip_id(cpu, add, chip); |
| return; |
| } |
| } |
| |
| l2_cache = cpu_to_l2cache(cpu); |
| mask = add ? cpu_online_mask : cpu_present_mask; |
| for_each_cpu(i, mask) { |
| np = cpu_to_l2cache(i); |
| if (!np) |
| continue; |
| if (np == l2_cache) { |
| if (add) { |
| cpumask_set_cpu(cpu, cpu_core_mask(i)); |
| cpumask_set_cpu(i, cpu_core_mask(cpu)); |
| } else { |
| cpumask_clear_cpu(cpu, cpu_core_mask(i)); |
| cpumask_clear_cpu(i, cpu_core_mask(cpu)); |
| } |
| } |
| of_node_put(np); |
| } |
| of_node_put(l2_cache); |
| } |
| |
| /* Activate a secondary processor. */ |
| void start_secondary(void *unused) |
| { |
| unsigned int cpu = smp_processor_id(); |
| int i, base; |
| |
| mmgrab(&init_mm); |
| current->active_mm = &init_mm; |
| |
| smp_store_cpu_info(cpu); |
| set_dec(tb_ticks_per_jiffy); |
| preempt_disable(); |
| cpu_callin_map[cpu] = 1; |
| |
| if (smp_ops->setup_cpu) |
| smp_ops->setup_cpu(cpu); |
| if (smp_ops->take_timebase) |
| smp_ops->take_timebase(); |
| |
| secondary_cpu_time_init(); |
| |
| #ifdef CONFIG_PPC64 |
| if (system_state == SYSTEM_RUNNING) |
| vdso_data->processorCount++; |
| |
| vdso_getcpu_init(); |
| #endif |
| /* Update sibling maps */ |
| base = cpu_first_thread_sibling(cpu); |
| for (i = 0; i < threads_per_core; i++) { |
| if (cpu_is_offline(base + i) && (cpu != base + i)) |
| continue; |
| cpumask_set_cpu(cpu, cpu_sibling_mask(base + i)); |
| cpumask_set_cpu(base + i, cpu_sibling_mask(cpu)); |
| |
| /* cpu_core_map should be a superset of |
| * cpu_sibling_map even if we don't have cache |
| * information, so update the former here, too. |
| */ |
| cpumask_set_cpu(cpu, cpu_core_mask(base + i)); |
| cpumask_set_cpu(base + i, cpu_core_mask(cpu)); |
| } |
| traverse_core_siblings(cpu, true); |
| |
| set_numa_node(numa_cpu_lookup_table[cpu]); |
| set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu])); |
| |
| smp_wmb(); |
| notify_cpu_starting(cpu); |
| set_cpu_online(cpu, true); |
| |
| local_irq_enable(); |
| |
| cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
| |
| BUG(); |
| } |
| |
| int setup_profiling_timer(unsigned int multiplier) |
| { |
| return 0; |
| } |
| |
| #ifdef CONFIG_SCHED_SMT |
| /* cpumask of CPUs with asymetric SMT dependancy */ |
| static int powerpc_smt_flags(void) |
| { |
| int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; |
| |
| if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { |
| printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); |
| flags |= SD_ASYM_PACKING; |
| } |
| return flags; |
| } |
| #endif |
| |
| static struct sched_domain_topology_level powerpc_topology[] = { |
| #ifdef CONFIG_SCHED_SMT |
| { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) }, |
| #endif |
| { cpu_cpu_mask, SD_INIT_NAME(DIE) }, |
| { NULL, }, |
| }; |
| |
| static __init long smp_setup_cpu_workfn(void *data __always_unused) |
| { |
| smp_ops->setup_cpu(boot_cpuid); |
| return 0; |
| } |
| |
| void __init smp_cpus_done(unsigned int max_cpus) |
| { |
| /* |
| * We want the setup_cpu() here to be called on the boot CPU, but |
| * init might run on any CPU, so make sure it's invoked on the boot |
| * CPU. |
| */ |
| if (smp_ops && smp_ops->setup_cpu) |
| work_on_cpu_safe(boot_cpuid, smp_setup_cpu_workfn, NULL); |
| |
| if (smp_ops && smp_ops->bringup_done) |
| smp_ops->bringup_done(); |
| |
| dump_numa_cpu_topology(); |
| |
| set_sched_topology(powerpc_topology); |
| } |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| int __cpu_disable(void) |
| { |
| int cpu = smp_processor_id(); |
| int base, i; |
| int err; |
| |
| if (!smp_ops->cpu_disable) |
| return -ENOSYS; |
| |
| err = smp_ops->cpu_disable(); |
| if (err) |
| return err; |
| |
| /* Update sibling maps */ |
| base = cpu_first_thread_sibling(cpu); |
| for (i = 0; i < threads_per_core && base + i < nr_cpu_ids; i++) { |
| cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i)); |
| cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu)); |
| cpumask_clear_cpu(cpu, cpu_core_mask(base + i)); |
| cpumask_clear_cpu(base + i, cpu_core_mask(cpu)); |
| } |
| traverse_core_siblings(cpu, false); |
| |
| return 0; |
| } |
| |
| void __cpu_die(unsigned int cpu) |
| { |
| if (smp_ops->cpu_die) |
| smp_ops->cpu_die(cpu); |
| } |
| |
| void cpu_die(void) |
| { |
| if (ppc_md.cpu_die) |
| ppc_md.cpu_die(); |
| |
| /* If we return, we re-enter start_secondary */ |
| start_secondary_resume(); |
| } |
| |
| #endif |