diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/parisc/kernel/smp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/parisc/kernel/smp.c | 472 |
1 files changed, 0 insertions, 472 deletions
diff --git a/ANDROID_3.4.5/arch/parisc/kernel/smp.c b/ANDROID_3.4.5/arch/parisc/kernel/smp.c deleted file mode 100644 index 4dc7b794..00000000 --- a/ANDROID_3.4.5/arch/parisc/kernel/smp.c +++ /dev/null @@ -1,472 +0,0 @@ -/* -** SMP Support -** -** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> -** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> -** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> -** -** Lots of stuff stolen from arch/alpha/kernel/smp.c -** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) -** -** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work. -** -grant (1/12/2001) -** -** 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. -*/ -#include <linux/types.h> -#include <linux/spinlock.h> - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/smp.h> -#include <linux/kernel_stat.h> -#include <linux/mm.h> -#include <linux/err.h> -#include <linux/delay.h> -#include <linux/bitops.h> -#include <linux/ftrace.h> -#include <linux/cpu.h> - -#include <linux/atomic.h> -#include <asm/current.h> -#include <asm/delay.h> -#include <asm/tlbflush.h> - -#include <asm/io.h> -#include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ -#include <asm/mmu_context.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/processor.h> -#include <asm/ptrace.h> -#include <asm/unistd.h> -#include <asm/cacheflush.h> - -#undef DEBUG_SMP -#ifdef DEBUG_SMP -static int smp_debug_lvl = 0; -#define smp_debug(lvl, printargs...) \ - if (lvl >= smp_debug_lvl) \ - printk(printargs); -#else -#define smp_debug(lvl, ...) do { } while(0) -#endif /* DEBUG_SMP */ - -volatile struct task_struct *smp_init_current_idle_task; - -/* track which CPU is booting */ -static volatile int cpu_now_booting __cpuinitdata; - -static int parisc_max_cpus __cpuinitdata = 1; - -static DEFINE_PER_CPU(spinlock_t, ipi_lock); - -enum ipi_message_type { - IPI_NOP=0, - IPI_RESCHEDULE=1, - IPI_CALL_FUNC, - IPI_CALL_FUNC_SINGLE, - IPI_CPU_START, - IPI_CPU_STOP, - IPI_CPU_TEST -}; - - -/********** SMP inter processor interrupt and communication routines */ - -#undef PER_CPU_IRQ_REGION -#ifdef PER_CPU_IRQ_REGION -/* XXX REVISIT Ignore for now. -** *May* need this "hook" to register IPI handler -** once we have perCPU ExtIntr switch tables. -*/ -static void -ipi_init(int cpuid) -{ -#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region - - if(cpu_online(cpuid) ) - { - switch_to_idle_task(current); - } - - return; -} -#endif - - -/* -** Yoink this CPU from the runnable list... -** -*/ -static void -halt_processor(void) -{ - /* REVISIT : redirect I/O Interrupts to another CPU? */ - /* REVISIT : does PM *know* this CPU isn't available? */ - set_cpu_online(smp_processor_id(), false); - local_irq_disable(); - for (;;) - ; -} - - -irqreturn_t __irq_entry -ipi_interrupt(int irq, void *dev_id) -{ - int this_cpu = smp_processor_id(); - struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu); - unsigned long ops; - unsigned long flags; - - /* Count this now; we may make a call that never returns. */ - p->ipi_count++; - - mb(); /* Order interrupt and bit testing. */ - - for (;;) { - spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); - spin_lock_irqsave(lock, flags); - ops = p->pending_ipi; - p->pending_ipi = 0; - spin_unlock_irqrestore(lock, flags); - - mb(); /* Order bit clearing and data access. */ - - if (!ops) - break; - - while (ops) { - unsigned long which = ffz(~ops); - - ops &= ~(1 << which); - - switch (which) { - case IPI_NOP: - smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); - break; - - case IPI_RESCHEDULE: - smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); - scheduler_ipi(); - break; - - case IPI_CALL_FUNC: - smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); - generic_smp_call_function_interrupt(); - break; - - case IPI_CALL_FUNC_SINGLE: - smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC_SINGLE\n", this_cpu); - generic_smp_call_function_single_interrupt(); - break; - - case IPI_CPU_START: - smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); - break; - - case IPI_CPU_STOP: - smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); - halt_processor(); - break; - - case IPI_CPU_TEST: - smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); - break; - - default: - printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", - this_cpu, which); - return IRQ_NONE; - } /* Switch */ - /* let in any pending interrupts */ - local_irq_enable(); - local_irq_disable(); - } /* while (ops) */ - } - return IRQ_HANDLED; -} - - -static inline void -ipi_send(int cpu, enum ipi_message_type op) -{ - struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu); - spinlock_t *lock = &per_cpu(ipi_lock, cpu); - unsigned long flags; - - spin_lock_irqsave(lock, flags); - p->pending_ipi |= 1 << op; - gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa); - spin_unlock_irqrestore(lock, flags); -} - -static void -send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op) -{ - int cpu; - - for_each_cpu(cpu, mask) - ipi_send(cpu, op); -} - -static inline void -send_IPI_single(int dest_cpu, enum ipi_message_type op) -{ - BUG_ON(dest_cpu == NO_PROC_ID); - - ipi_send(dest_cpu, op); -} - -static inline void -send_IPI_allbutself(enum ipi_message_type op) -{ - int i; - - for_each_online_cpu(i) { - if (i != smp_processor_id()) - send_IPI_single(i, op); - } -} - - -inline void -smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } - -static inline void -smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } - -void -smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } - -void -smp_send_all_nop(void) -{ - send_IPI_allbutself(IPI_NOP); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_IPI_mask(mask, IPI_CALL_FUNC); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE); -} - -/* - * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() - * as we want to ensure all TLB's flushed before proceeding. - */ - -void -smp_flush_tlb_all(void) -{ - on_each_cpu(flush_tlb_all_local, NULL, 1); -} - -/* - * Called by secondaries to update state and initialize CPU registers. - */ -static void __init -smp_cpu_init(int cpunum) -{ - extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */ - extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ - extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ - - /* Set modes and Enable floating point coprocessor */ - (void) init_per_cpu(cpunum); - - disable_sr_hashing(); - - mb(); - - /* Well, support 2.4 linux scheme as well. */ - if (cpu_online(cpunum)) { - extern void machine_halt(void); /* arch/parisc.../process.c */ - - printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); - machine_halt(); - } - - notify_cpu_starting(cpunum); - - ipi_call_lock(); - set_cpu_online(cpunum, true); - ipi_call_unlock(); - - /* Initialise the idle task for this CPU */ - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - BUG_ON(current->mm); - enter_lazy_tlb(&init_mm, current); - - init_IRQ(); /* make sure no IRQs are enabled or pending */ - start_cpu_itimer(); -} - - -/* - * Slaves start using C here. Indirectly called from smp_slave_stext. - * Do what start_kernel() and main() do for boot strap processor (aka monarch) - */ -void __init smp_callin(void) -{ - int slave_id = cpu_now_booting; - - smp_cpu_init(slave_id); - preempt_disable(); - - flush_cache_all_local(); /* start with known state */ - flush_tlb_all_local(NULL); - - local_irq_enable(); /* Interrupts have been off until now */ - - cpu_idle(); /* Wait for timer to schedule some work */ - - /* NOTREACHED */ - panic("smp_callin() AAAAaaaaahhhh....\n"); -} - -/* - * Bring one cpu online. - */ -int __cpuinit smp_boot_one_cpu(int cpuid) -{ - const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid); - struct task_struct *idle; - long timeout; - - /* - * Create an idle task for this CPU. Note the address wed* give - * to kernel_thread is irrelevant -- it's going to start - * where OS_BOOT_RENDEVZ vector in SAL says to start. But - * this gets all the other task-y sort of data structures set - * up like we wish. We need to pull the just created idle task - * off the run queue and stuff it into the init_tasks[] array. - * Sheesh . . . - */ - - idle = fork_idle(cpuid); - if (IS_ERR(idle)) - panic("SMP: fork failed for CPU:%d", cpuid); - - task_thread_info(idle)->cpu = cpuid; - - /* Let _start know what logical CPU we're booting - ** (offset into init_tasks[],cpu_data[]) - */ - cpu_now_booting = cpuid; - - /* - ** boot strap code needs to know the task address since - ** it also contains the process stack. - */ - smp_init_current_idle_task = idle ; - mb(); - - printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa); - - /* - ** This gets PDC to release the CPU from a very tight loop. - ** - ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: - ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which - ** is executed after receiving the rendezvous signal (an interrupt to - ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the - ** contents of memory are valid." - */ - gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa); - mb(); - - /* - * OK, wait a bit for that CPU to finish staggering about. - * Slave will set a bit when it reaches smp_cpu_init(). - * Once the "monarch CPU" sees the bit change, it can move on. - */ - for (timeout = 0; timeout < 10000; timeout++) { - if(cpu_online(cpuid)) { - /* Which implies Slave has started up */ - cpu_now_booting = 0; - smp_init_current_idle_task = NULL; - goto alive ; - } - udelay(100); - barrier(); - } - - put_task_struct(idle); - idle = NULL; - - printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); - return -1; - -alive: - /* Remember the Slave data */ - smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", - cpuid, timeout * 100); - return 0; -} - -void __init smp_prepare_boot_cpu(void) -{ - int bootstrap_processor = per_cpu(cpu_data, 0).cpuid; - - /* Setup BSP mappings */ - printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor); - - set_cpu_online(bootstrap_processor, true); - set_cpu_present(bootstrap_processor, true); -} - - - -/* -** inventory.c:do_inventory() hasn't yet been run and thus we -** don't 'discover' the additional CPUs until later. -*/ -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - int cpu; - - for_each_possible_cpu(cpu) - spin_lock_init(&per_cpu(ipi_lock, cpu)); - - init_cpu_present(cpumask_of(0)); - - parisc_max_cpus = max_cpus; - if (!max_cpus) - printk(KERN_INFO "SMP mode deactivated.\n"); -} - - -void smp_cpus_done(unsigned int cpu_max) -{ - return; -} - - -int __cpuinit __cpu_up(unsigned int cpu) -{ - if (cpu != 0 && cpu < parisc_max_cpus) - smp_boot_one_cpu(cpu); - - return cpu_online(cpu) ? 0 : -ENOSYS; -} - -#ifdef CONFIG_PROC_FS -int __init -setup_profiling_timer(unsigned int multiplier) -{ - return -EINVAL; -} -#endif |