diff options
Diffstat (limited to 'arch/arm/kernel/smp.c')
| -rw-r--r-- | arch/arm/kernel/smp.c | 848 |
1 files changed, 848 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c new file mode 100644 index 000000000..5c5842d69 --- /dev/null +++ b/arch/arm/kernel/smp.c @@ -0,0 +1,848 @@ +/* + * linux/arch/arm/kernel/smp.c + * + * Copyright (C) 2002 ARM Limited, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/cache.h> +#include <linux/profile.h> +#include <linux/errno.h> +#include <linux/mm.h> +#include <linux/err.h> +#include <linux/cpu.h> +#include <linux/seq_file.h> +#include <linux/irq.h> +#include <linux/percpu.h> +#include <linux/clockchips.h> +#include <linux/completion.h> +#include <linux/cpufreq.h> + +#include <linux/atomic.h> +#include <asm/smp.h> +#include <asm/cacheflush.h> +#include <asm/cpu.h> +#include <asm/cputype.h> +#include <asm/exception.h> +#include <asm/idmap.h> +#include <asm/topology.h> +#include <asm/mmu_context.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/processor.h> +#include <asm/sections.h> +#include <asm/tlbflush.h> +#include <asm/ptrace.h> +#include <asm/localtimer.h> +#include <asm/smp_plat.h> +#include <asm/virt.h> +#include <asm/mach/arch.h> +#include <linux/mt_sched_mon.h> +/******************************************************************************* +* 20131225 marc.huang * +* CPU Hotplug debug * +*******************************************************************************/ +#include <linux/mtk_ram_console.h> +/******************************************************************************/ + +#define CREATE_TRACE_POINTS +#include <trace/events/ipi.h> + +/* + * as from 2.5, kernels no longer have an init_tasks structure + * so we need some other way of telling a new secondary core + * where to place its SVC stack + */ +struct secondary_data secondary_data; + +/* + * control for which core is the next to come out of the secondary + * boot "holding pen" + */ +volatile int __cpuinitdata pen_release = -1; + +enum ipi_msg_type { + IPI_WAKEUP, + IPI_TIMER, + IPI_RESCHEDULE, + IPI_CALL_FUNC, + IPI_CALL_FUNC_SINGLE, + IPI_CPU_STOP, + IPI_CPU_BACKTRACE, +}; + +static DECLARE_COMPLETION(cpu_running); + +static struct smp_operations smp_ops; + +void __init smp_set_ops(struct smp_operations *ops) +{ + if (ops) + smp_ops = *ops; +}; + +int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle) +{ + int ret; + + /* + * We need to tell the secondary core where to find + * its stack and the page tables. + */ + secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; + secondary_data.pgdir = virt_to_phys(idmap_pgd); + secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir); + __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data)); + outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); + + /* + * Now bring the CPU into our world. + */ + ret = boot_secondary(cpu, idle); + if (ret == 0) { + /* + * CPU was successfully started, wait for it + * to come online or time out. + */ + wait_for_completion_timeout(&cpu_running, + msecs_to_jiffies(1000)); + + if (!cpu_online(cpu)) { + pr_crit("CPU%u: failed to come online\n", cpu); + ret = -EIO; + } + } else { + pr_err("CPU%u: failed to boot: %d\n", cpu, ret); + } + + secondary_data.stack = NULL; + secondary_data.pgdir = 0; + + return ret; +} + +/* platform specific SMP operations */ +void __init smp_init_cpus(void) +{ + if (smp_ops.smp_init_cpus) + smp_ops.smp_init_cpus(); +} + +int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + if (smp_ops.smp_boot_secondary) + return smp_ops.smp_boot_secondary(cpu, idle); + return -ENOSYS; +} + +#ifdef CONFIG_HOTPLUG_CPU +static void percpu_timer_stop(void); + +static int platform_cpu_kill(unsigned int cpu) +{ + if (smp_ops.cpu_kill) + return smp_ops.cpu_kill(cpu); + return 1; +} + +static int platform_cpu_disable(unsigned int cpu) +{ + if (smp_ops.cpu_disable) + return smp_ops.cpu_disable(cpu); + + /* + * By default, allow disabling all CPUs except the first one, + * since this is special on a lot of platforms, e.g. because + * of clock tick interrupts. + */ + return cpu == 0 ? -EPERM : 0; +} +/* + * __cpu_disable runs on the processor to be shutdown. + */ +int __cpuinit __cpu_disable(void) +{ + unsigned int cpu = smp_processor_id(); + int ret; + + ret = platform_cpu_disable(cpu); + if (ret) + return ret; + + /* + * Take this CPU offline. Once we clear this, we can't return, + * and we must not schedule until we're ready to give up the cpu. + */ + set_cpu_online(cpu, false); + + /* + * OK - migrate IRQs away from this CPU + */ + migrate_irqs(); + + /* + * Stop the local timer for this CPU. + */ + percpu_timer_stop(); + + /* + * Flush user cache and TLB mappings, and then remove this CPU + * from the vm mask set of all processes. + * + * Caches are flushed to the Level of Unification Inner Shareable + * to write-back dirty lines to unified caches shared by all CPUs. + */ + flush_cache_louis(); + local_flush_tlb_all(); + + clear_tasks_mm_cpumask(cpu); + + return 0; +} + +static DECLARE_COMPLETION(cpu_died); + +/* + * called on the thread which is asking for a CPU to be shutdown - + * waits until shutdown has completed, or it is timed out. + */ +void __cpuinit __cpu_die(unsigned int cpu) +{ + if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) { + pr_err("CPU%u: cpu didn't die\n", cpu); + return; + } + printk(KERN_NOTICE "CPU%u: shutdown\n", cpu); + + /* + * platform_cpu_kill() is generally expected to do the powering off + * and/or cutting of clocks to the dying CPU. Optionally, this may + * be done by the CPU which is dying in preference to supporting + * this call, but that means there is _no_ synchronisation between + * the requesting CPU and the dying CPU actually losing power. + */ + if (!platform_cpu_kill(cpu)) + printk("CPU%u: unable to kill\n", cpu); +} + +/* + * Called from the idle thread for the CPU which has been shutdown. + * + * Note that we disable IRQs here, but do not re-enable them + * before returning to the caller. This is also the behaviour + * of the other hotplug-cpu capable cores, so presumably coming + * out of idle fixes this. + */ +void __ref cpu_die(void) +{ + unsigned int cpu = smp_processor_id(); + aee_rr_rec_hoplug(cpu, 51, 0); + + idle_task_exit(); + aee_rr_rec_hoplug(cpu, 52, 0); + + local_irq_disable(); + aee_rr_rec_hoplug(cpu, 53, 0); + + /* + * Flush the data out of the L1 cache for this CPU. This must be + * before the completion to ensure that data is safely written out + * before platform_cpu_kill() gets called - which may disable + * *this* CPU and power down its cache. + */ + flush_cache_louis(); + aee_rr_rec_hoplug(cpu, 54, 0); + + /* + * Tell __cpu_die() that this CPU is now safe to dispose of. Once + * this returns, power and/or clocks can be removed at any point + * from this CPU and its cache by platform_cpu_kill(). + */ + complete(&cpu_died); + aee_rr_rec_hoplug(cpu, 55, 0); + + /* + * Ensure that the cache lines associated with that completion are + * written out. This covers the case where _this_ CPU is doing the + * powering down, to ensure that the completion is visible to the + * CPU waiting for this one. + */ + flush_cache_louis(); + aee_rr_rec_hoplug(cpu, 56, 0); + + /* + * The actual CPU shutdown procedure is at least platform (if not + * CPU) specific. This may remove power, or it may simply spin. + * + * Platforms are generally expected *NOT* to return from this call, + * although there are some which do because they have no way to + * power down the CPU. These platforms are the _only_ reason we + * have a return path which uses the fragment of assembly below. + * + * The return path should not be used for platforms which can + * power off the CPU. + */ + if (smp_ops.cpu_die) + smp_ops.cpu_die(cpu); + + /* + * Do not return to the idle loop - jump back to the secondary + * cpu initialisation. There's some initialisation which needs + * to be repeated to undo the effects of taking the CPU offline. + */ + __asm__("mov sp, %0\n" + " mov fp, #0\n" + " b secondary_start_kernel" + : + : "r" (task_stack_page(current) + THREAD_SIZE - 8)); +} +#endif /* CONFIG_HOTPLUG_CPU */ + +/* + * Called by both boot and secondaries to move global data into + * per-processor storage. + */ +static void __cpuinit smp_store_cpu_info(unsigned int cpuid) +{ + struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); + + cpu_info->loops_per_jiffy = loops_per_jiffy; + cpu_info->cpuid = read_cpuid_id(); + + store_cpu_topology(cpuid); +} + +static void percpu_timer_setup(void); + +/* + * This is the secondary CPU boot entry. We're using this CPUs + * idle thread stack, but a set of temporary page tables. + */ +asmlinkage void __cpuinit secondary_start_kernel(void) +{ + struct mm_struct *mm = &init_mm; + unsigned int cpu = 0; + aee_rr_rec_hoplug(cpu, 1, 0); + + /* + * The identity mapping is uncached (strongly ordered), so + * switch away from it before attempting any exclusive accesses. + */ + cpu_switch_mm(mm->pgd, mm); + local_flush_bp_all(); + enter_lazy_tlb(mm, current); + local_flush_tlb_all(); + aee_rr_rec_hoplug(cpu, 2, 0); + + /* + * All kernel threads share the same mm context; grab a + * reference and switch to it. + */ + cpu = smp_processor_id(); + aee_rr_rec_hoplug(cpu, 3, 0); + atomic_inc(&mm->mm_count); + current->active_mm = mm; + cpumask_set_cpu(cpu, mm_cpumask(mm)); + aee_rr_rec_hoplug(cpu, 4, 0); + + cpu_init(); + aee_rr_rec_hoplug(cpu, 5, 0); + + printk("CPU%u: Booted secondary processor\n", cpu); + + preempt_disable(); + aee_rr_rec_hoplug(cpu, 6, 0); + trace_hardirqs_off(); + aee_rr_rec_hoplug(cpu, 7, 0); + + /* + * Give the platform a chance to do its own initialisation. + */ + if (smp_ops.smp_secondary_init) + smp_ops.smp_secondary_init(cpu); + aee_rr_rec_hoplug(cpu, 8, 0); + + notify_cpu_starting(cpu); + aee_rr_rec_hoplug(cpu, 9, 0); + + calibrate_delay(); + aee_rr_rec_hoplug(cpu, 10, 0); + + smp_store_cpu_info(cpu); + aee_rr_rec_hoplug(cpu, 11, 0); + + /* + * OK, now it's safe to let the boot CPU continue. Wait for + * the CPU migration code to notice that the CPU is online + * before we continue - which happens after __cpu_up returns. + */ + set_cpu_online(cpu, true); + aee_rr_rec_hoplug(cpu, 12, 0); + complete(&cpu_running); + aee_rr_rec_hoplug(cpu, 13, 0); + + /* + * Setup the percpu timer for this CPU. + */ + percpu_timer_setup(); + aee_rr_rec_hoplug(cpu, 14, 0); + + local_irq_enable(); + aee_rr_rec_hoplug(cpu, 15, 0); + local_fiq_enable(); + aee_rr_rec_hoplug(cpu, 16, 0); + + /* + * OK, it's off to the idle thread for us + */ + cpu_startup_entry(CPUHP_ONLINE); + aee_rr_rec_hoplug(cpu, 17, 0); +} + +void __init smp_cpus_done(unsigned int max_cpus) +{ + int cpu; + unsigned long bogosum = 0; + + for_each_online_cpu(cpu) + bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; + + printk(KERN_INFO "SMP: Total of %d processors activated " + "(%lu.%02lu BogoMIPS).\n", + num_online_cpus(), + bogosum / (500000/HZ), + (bogosum / (5000/HZ)) % 100); + + hyp_mode_check(); +} + +void __init smp_prepare_boot_cpu(void) +{ + set_my_cpu_offset(per_cpu_offset(smp_processor_id())); +} + +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + unsigned int ncores = num_possible_cpus(); + + init_cpu_topology(); + + smp_store_cpu_info(smp_processor_id()); + + /* + * are we trying to boot more cores than exist? + */ + if (max_cpus > ncores) + max_cpus = ncores; + if (ncores > 1 && max_cpus) { + /* + * Enable the local timer or broadcast device for the + * boot CPU, but only if we have more than one CPU. + */ + percpu_timer_setup(); + + /* + * Initialise the present map, which describes the set of CPUs + * actually populated at the present time. A platform should + * re-initialize the map in the platforms smp_prepare_cpus() + * if present != possible (e.g. physical hotplug). + */ + init_cpu_present(cpu_possible_mask); + + /* + * Initialise the SCU if there are more than one CPU + * and let them know where to start. + */ + if (smp_ops.smp_prepare_cpus) + smp_ops.smp_prepare_cpus(max_cpus); + } +} + +static void (*__smp_cross_call)(const struct cpumask *, unsigned int); + +void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) +{ + if (!__smp_cross_call) + __smp_cross_call = fn; +} + +static const char *ipi_types[NR_IPI] __tracepoint_string = { +#define S(x,s) [x] = s + S(IPI_WAKEUP, "CPU wakeup interrupts"), + S(IPI_TIMER, "Timer broadcast interrupts"), + S(IPI_RESCHEDULE, "Rescheduling interrupts"), + S(IPI_CALL_FUNC, "Function call interrupts"), + S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"), + S(IPI_CPU_STOP, "CPU stop interrupts"), + S(IPI_CPU_BACKTRACE, "CPU backtrace"), +}; + +static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) +{ + trace_ipi_raise(target, ipi_types[ipinr]); + __smp_cross_call(target, ipinr); +} + +void show_ipi_list(struct seq_file *p, int prec) +{ + unsigned int cpu, i; + + for (i = 0; i < NR_IPI; i++) { + seq_printf(p, "%*s%u: ", prec - 1, "IPI", i); + + for_each_online_cpu(cpu) + seq_printf(p, "%10u ", + __get_irq_stat(cpu, ipi_irqs[i])); + + seq_printf(p, " %s\n", ipi_types[i]); + } +} + +u64 smp_irq_stat_cpu(unsigned int cpu) +{ + u64 sum = 0; + int i; + + for (i = 0; i < NR_IPI; i++) + sum += __get_irq_stat(cpu, ipi_irqs[i]); + + return sum; +} + +/* + * Timer (local or broadcast) support + */ +static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); + +void arch_send_call_function_ipi_mask(const struct cpumask *mask) +{ + smp_cross_call(mask, IPI_CALL_FUNC); +} + +void arch_send_wakeup_ipi_mask(const struct cpumask *mask) +{ + smp_cross_call(mask, IPI_WAKEUP); +} + +void arch_send_call_function_single_ipi(int cpu) +{ + smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); +} + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +void tick_broadcast(const struct cpumask *mask) +{ + smp_cross_call(mask, IPI_TIMER); +} +#endif + +static void broadcast_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ +} + +static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt) +{ + evt->name = "dummy_timer"; + evt->features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_DUMMY; + evt->rating = 100; + evt->mult = 1; + evt->set_mode = broadcast_timer_set_mode; + + clockevents_register_device(evt); +} + +static struct local_timer_ops *lt_ops; + +#ifdef CONFIG_LOCAL_TIMERS +int local_timer_register(struct local_timer_ops *ops) +{ + if (!is_smp() || !setup_max_cpus) + return -ENXIO; + + if (lt_ops) + return -EBUSY; + + lt_ops = ops; + return 0; +} +#endif + +static void __cpuinit percpu_timer_setup(void) +{ + unsigned int cpu = smp_processor_id(); + struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); + + evt->cpumask = cpumask_of(cpu); + + if (!lt_ops || lt_ops->setup(evt)) + broadcast_timer_setup(evt); +} + +#ifdef CONFIG_HOTPLUG_CPU +/* + * The generic clock events code purposely does not stop the local timer + * on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it + * manually here. + */ +static void percpu_timer_stop(void) +{ + unsigned int cpu = smp_processor_id(); + struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); + + if (lt_ops) + lt_ops->stop(evt); +} +#endif + +static DEFINE_RAW_SPINLOCK(stop_lock); + +/* + * ipi_cpu_stop - handle IPI from smp_send_stop() + */ +static void ipi_cpu_stop(unsigned int cpu) +{ + if (system_state == SYSTEM_BOOTING || + system_state == SYSTEM_RUNNING) { + raw_spin_lock(&stop_lock); + printk(KERN_CRIT "CPU%u: stopping\n", cpu); + dump_stack(); + raw_spin_unlock(&stop_lock); + } + + set_cpu_online(cpu, false); + + local_fiq_disable(); + local_irq_disable(); + + while (1) + cpu_relax(); +} + +static cpumask_t backtrace_mask; +static DEFINE_RAW_SPINLOCK(backtrace_lock); + +/* "in progress" flag of arch_trigger_all_cpu_backtrace */ +static unsigned long backtrace_flag; + +void smp_send_all_cpu_backtrace(void) +{ + unsigned int this_cpu = smp_processor_id(); + int i; + + if (test_and_set_bit(0, &backtrace_flag)) + /* + * If there is already a trigger_all_cpu_backtrace() in progress + * (backtrace_flag == 1), don't output double cpu dump infos. + */ + return; + + cpumask_copy(&backtrace_mask, cpu_online_mask); + cpu_clear(this_cpu, backtrace_mask); + + pr_info("Backtrace for cpu %d (current):\n", this_cpu); + dump_stack(); + + pr_info("\nsending IPI to all other CPUs:\n"); + smp_cross_call(&backtrace_mask, IPI_CPU_BACKTRACE); + + /* Wait for up to 10 seconds for all other CPUs to do the backtrace */ + for (i = 0; i < 10 * 1000; i++) { + if (cpumask_empty(&backtrace_mask)) + break; + mdelay(1); + } + + clear_bit(0, &backtrace_flag); + smp_mb__after_clear_bit(); +} + +/* + * ipi_cpu_backtrace - handle IPI from smp_send_all_cpu_backtrace() + */ +static void ipi_cpu_backtrace(unsigned int cpu, struct pt_regs *regs) +{ + if (cpu_isset(cpu, backtrace_mask)) { + raw_spin_lock(&backtrace_lock); + pr_warning("IPI backtrace for cpu %d\n", cpu); + show_regs(regs); + raw_spin_unlock(&backtrace_lock); + cpu_clear(cpu, backtrace_mask); + } +} + +/* + * Main handler for inter-processor interrupts + */ +asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) +{ + handle_IPI(ipinr, regs); +} + +void handle_IPI(int ipinr, struct pt_regs *regs) +{ + unsigned int cpu = smp_processor_id(); + struct pt_regs *old_regs = set_irq_regs(regs); + + if ((unsigned)ipinr < NR_IPI) { + trace_ipi_entry(ipi_types[ipinr]); + __inc_irq_stat(cpu, ipi_irqs[ipinr]); + } + + switch (ipinr) { + case IPI_WAKEUP: + mt_trace_ISR_start(ipinr); + mt_trace_ISR_end(ipinr); + break; + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + case IPI_TIMER: + irq_enter(); + mt_trace_ISR_start(ipinr); + tick_receive_broadcast(); + mt_trace_ISR_end(ipinr); + irq_exit(); + break; +#endif + + case IPI_RESCHEDULE: + scheduler_ipi(); + break; + + case IPI_CALL_FUNC: + irq_enter(); + mt_trace_ISR_start(ipinr); + generic_smp_call_function_interrupt(); + mt_trace_ISR_end(ipinr); + irq_exit(); + break; + + case IPI_CALL_FUNC_SINGLE: + irq_enter(); + mt_trace_ISR_start(ipinr); + generic_smp_call_function_single_interrupt(); + mt_trace_ISR_end(ipinr); + irq_exit(); + break; + + case IPI_CPU_STOP: + irq_enter(); + mt_trace_ISR_start(ipinr); + ipi_cpu_stop(cpu); + mt_trace_ISR_end(ipinr); + irq_exit(); + break; + + case IPI_CPU_BACKTRACE: + mt_trace_ISR_start(ipinr); + ipi_cpu_backtrace(cpu, regs); + mt_trace_ISR_end(ipinr); + break; + + default: + mt_trace_ISR_start(ipinr); + printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", + cpu, ipinr); + mt_trace_ISR_end(ipinr); + break; + } + + if ((unsigned)ipinr < NR_IPI) + trace_ipi_exit(ipi_types[ipinr]); + set_irq_regs(old_regs); +} + +void smp_send_reschedule(int cpu) +{ + smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); +} + +void smp_send_stop(void) +{ + unsigned long timeout; + struct cpumask mask; + + cpumask_copy(&mask, cpu_online_mask); + cpumask_clear_cpu(smp_processor_id(), &mask); + if (!cpumask_empty(&mask)) + smp_cross_call(&mask, IPI_CPU_STOP); + + /* Wait up to one second for other CPUs to stop */ + timeout = USEC_PER_SEC; + while (num_online_cpus() > 1 && timeout--) + udelay(1); + + if (num_online_cpus() > 1) + pr_warning("SMP: failed to stop secondary CPUs\n"); +} + +/* + * not supported here + */ +int setup_profiling_timer(unsigned int multiplier) +{ + return -EINVAL; +} + +#ifdef CONFIG_CPU_FREQ + +static DEFINE_PER_CPU(unsigned long, l_p_j_ref); +static DEFINE_PER_CPU(unsigned long, l_p_j_ref_freq); +static unsigned long global_l_p_j_ref; +static unsigned long global_l_p_j_ref_freq; + +static int cpufreq_callback(struct notifier_block *nb, + unsigned long val, void *data) +{ + struct cpufreq_freqs *freq = data; + int cpu = freq->cpu; + + if (freq->flags & CPUFREQ_CONST_LOOPS) + return NOTIFY_OK; + + if (!per_cpu(l_p_j_ref, cpu)) { + per_cpu(l_p_j_ref, cpu) = + per_cpu(cpu_data, cpu).loops_per_jiffy; + per_cpu(l_p_j_ref_freq, cpu) = freq->old; + if (!global_l_p_j_ref) { + global_l_p_j_ref = loops_per_jiffy; + global_l_p_j_ref_freq = freq->old; + } + } + + if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || + (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) || + (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) { + loops_per_jiffy = cpufreq_scale(global_l_p_j_ref, + global_l_p_j_ref_freq, + freq->new); + per_cpu(cpu_data, cpu).loops_per_jiffy = + cpufreq_scale(per_cpu(l_p_j_ref, cpu), + per_cpu(l_p_j_ref_freq, cpu), + freq->new); + } + return NOTIFY_OK; +} + +static struct notifier_block cpufreq_notifier = { + .notifier_call = cpufreq_callback, +}; + +static int __init register_cpufreq_notifier(void) +{ + return cpufreq_register_notifier(&cpufreq_notifier, + CPUFREQ_TRANSITION_NOTIFIER); +} +core_initcall(register_cpufreq_notifier); + +#endif |