diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/kernel/smp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/kernel/smp.c | 670 |
1 files changed, 0 insertions, 670 deletions
diff --git a/ANDROID_3.4.5/arch/arm/kernel/smp.c b/ANDROID_3.4.5/arch/arm/kernel/smp.c deleted file mode 100644 index f30d6832..00000000 --- a/ANDROID_3.4.5/arch/arm/kernel/smp.c +++ /dev/null @@ -1,670 +0,0 @@ -/* - * 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/smp.h> -#include <linux/seq_file.h> -#include <linux/irq.h> -#include <linux/percpu.h> -#include <linux/clockchips.h> -#include <linux/completion.h> - -#include <linux/atomic.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> - -/* - * 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; - -enum ipi_msg_type { - IPI_TIMER = 2, - IPI_RESCHEDULE, - IPI_CALL_FUNC, - IPI_CALL_FUNC_SINGLE, - IPI_CPU_STOP, - IPI_CPU_BACKTRACE, -}; - -static DECLARE_COMPLETION(cpu_running); - -int __cpuinit __cpu_up(unsigned int cpu) -{ - struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); - struct task_struct *idle = ci->idle; - int ret; - - /* - * Spawn a new process manually, if not already done. - * Grab a pointer to its task struct so we can mess with it - */ - if (!idle) { - idle = fork_idle(cpu); - if (IS_ERR(idle)) { - printk(KERN_ERR "CPU%u: fork() failed\n", cpu); - return PTR_ERR(idle); - } - ci->idle = idle; - } else { - /* - * Since this idle thread is being re-used, call - * init_idle() to reinitialize the thread structure. - */ - init_idle(idle, cpu); - } - - /* - * 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; -} - -#ifdef CONFIG_HOTPLUG_CPU -static void percpu_timer_stop(void); - -/* - * __cpu_disable runs on the processor to be shutdown. - */ -int __cpu_disable(void) -{ - unsigned int cpu = smp_processor_id(); - struct task_struct *p; - 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. - */ - flush_cache_all(); - local_flush_tlb_all(); - - read_lock(&tasklist_lock); - for_each_process(p) { - if (p->mm) - cpumask_clear_cpu(cpu, mm_cpumask(p->mm)); - } - read_unlock(&tasklist_lock); - - 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 __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); - - 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(); - - idle_task_exit(); - - local_irq_disable(); - mb(); - - /* Tell __cpu_die() that this CPU is now safe to dispose of */ - complete(&cpu_died); - - /* - * actual CPU shutdown procedure is at least platform (if not - * CPU) specific. - */ - platform_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; - - 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 = smp_processor_id(); - - /* - * All kernel threads share the same mm context; grab a - * reference and switch to it. - */ - atomic_inc(&mm->mm_count); - current->active_mm = mm; - cpumask_set_cpu(cpu, mm_cpumask(mm)); - cpu_switch_mm(mm->pgd, mm); - enter_lazy_tlb(mm, current); - local_flush_tlb_all(); - - printk("CPU%u: Booted secondary processor\n", cpu); - - cpu_init(); - preempt_disable(); - trace_hardirqs_off(); - - /* - * Give the platform a chance to do its own initialisation. - */ - platform_secondary_init(cpu); - - notify_cpu_starting(cpu); - - calibrate_delay(); - - smp_store_cpu_info(cpu); - - /* - * 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); - complete(&cpu_running); - - /* - * Setup the percpu timer for this CPU. - */ - percpu_timer_setup(); - - local_irq_enable(); - local_fiq_enable(); - - /* - * OK, it's off to the idle thread for us - */ - cpu_idle(); -} - -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); -} - -void __init smp_prepare_boot_cpu(void) -{ - unsigned int cpu = smp_processor_id(); - - per_cpu(cpu_data, cpu).idle = current; -} - -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 platform_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. - */ - platform_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)) -{ - smp_cross_call = fn; -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - smp_cross_call(mask, IPI_CALL_FUNC); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); -} - -static const char *ipi_types[NR_IPI] = { -#define S(x,s) [x - IPI_TIMER] = s - 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"), -}; - -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_present_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); - -static void ipi_timer(void) -{ - struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); - evt->event_handler(evt); -} - -#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST -static void smp_timer_broadcast(const struct cpumask *mask) -{ - smp_cross_call(mask, IPI_TIMER); -} -#else -#define smp_timer_broadcast NULL -#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 = 400; - 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 (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); - evt->broadcast = smp_timer_broadcast; - - 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 (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI) - __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]); - - switch (ipinr) { - case IPI_TIMER: - irq_enter(); - ipi_timer(); - irq_exit(); - break; - - case IPI_RESCHEDULE: - scheduler_ipi(); - break; - - case IPI_CALL_FUNC: - irq_enter(); - generic_smp_call_function_interrupt(); - irq_exit(); - break; - - case IPI_CALL_FUNC_SINGLE: - irq_enter(); - generic_smp_call_function_single_interrupt(); - irq_exit(); - break; - - case IPI_CPU_STOP: - irq_enter(); - ipi_cpu_stop(cpu); - irq_exit(); - break; - - case IPI_CPU_BACKTRACE: - ipi_cpu_backtrace(cpu, regs); - break; - - default: - printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", - cpu, ipinr); - break; - } - set_irq_regs(old_regs); -} - -void smp_send_reschedule(int cpu) -{ - smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); -} - -#ifdef CONFIG_HOTPLUG_CPU -static void smp_kill_cpus(cpumask_t *mask) -{ - unsigned int cpu; - for_each_cpu(cpu, mask) - platform_cpu_kill(cpu); -} -#else -static void smp_kill_cpus(cpumask_t *mask) { } -#endif - -void smp_send_stop(void) -{ - unsigned long timeout; - struct cpumask mask; - - cpumask_copy(&mask, cpu_online_mask); - cpumask_clear_cpu(smp_processor_id(), &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"); - - smp_kill_cpus(&mask); -} - -/* - * not supported here - */ -int setup_profiling_timer(unsigned int multiplier) -{ - return -EINVAL; -} |