diff options
Diffstat (limited to 'arch/ppc/kernel/smp.c')
| -rw-r--r-- | arch/ppc/kernel/smp.c | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/arch/ppc/kernel/smp.c b/arch/ppc/kernel/smp.c deleted file mode 100644 index 055998575cb4..000000000000 --- a/arch/ppc/kernel/smp.c +++ /dev/null @@ -1,414 +0,0 @@ -/* - * 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> - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/kernel_stat.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/cache.h> - -#include <asm/ptrace.h> -#include <asm/atomic.h> -#include <asm/irq.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/io.h> -#include <asm/prom.h> -#include <asm/smp.h> -#include <asm/residual.h> -#include <asm/time.h> -#include <asm/thread_info.h> -#include <asm/tlbflush.h> -#include <asm/xmon.h> -#include <asm/machdep.h> - -volatile int smp_commenced; -int smp_tb_synchronized; -struct cpuinfo_PPC cpu_data[NR_CPUS]; -atomic_t ipi_recv; -atomic_t ipi_sent; -cpumask_t cpu_online_map; -cpumask_t cpu_possible_map; -int smp_hw_index[NR_CPUS]; -struct thread_info *secondary_ti; -static struct task_struct *idle_tasks[NR_CPUS]; - -EXPORT_SYMBOL(cpu_online_map); -EXPORT_SYMBOL(cpu_possible_map); - -/* SMP operations for this machine */ -struct smp_ops_t *smp_ops; - -/* all cpu mappings are 1-1 -- Cort */ -volatile unsigned long cpu_callin_map[NR_CPUS]; - -int start_secondary(void *); -void smp_call_function_interrupt(void); -static int __smp_call_function(void (*func) (void *info), void *info, - int wait, int target); - -/* Low level assembly function used to backup CPU 0 state */ -extern void __save_cpu_setup(void); - -/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers. - * - * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up - * in /proc/interrupts will be wrong!!! --Troy */ -#define PPC_MSG_CALL_FUNCTION 0 -#define PPC_MSG_RESCHEDULE 1 -#define PPC_MSG_INVALIDATE_TLB 2 -#define PPC_MSG_XMON_BREAK 3 - -static inline void -smp_message_pass(int target, int msg) -{ - if (smp_ops) { - atomic_inc(&ipi_sent); - smp_ops->message_pass(target, msg); - } -} - -/* - * Common functions - */ -void smp_message_recv(int msg) -{ - atomic_inc(&ipi_recv); - - switch( msg ) { - case PPC_MSG_CALL_FUNCTION: - smp_call_function_interrupt(); - break; - case PPC_MSG_RESCHEDULE: - set_need_resched(); - break; - case PPC_MSG_INVALIDATE_TLB: - _tlbia(); - break; -#ifdef CONFIG_XMON - case PPC_MSG_XMON_BREAK: - xmon(get_irq_regs()); - break; -#endif /* CONFIG_XMON */ - default: - printk("SMP %d: smp_message_recv(): unknown msg %d\n", - smp_processor_id(), msg); - break; - } -} - -/* - * 750's don't broadcast tlb invalidates so - * we have to emulate that behavior. - * -- Cort - */ -void smp_send_tlb_invalidate(int cpu) -{ - if ( PVR_VER(mfspr(SPRN_PVR)) == 8 ) - smp_message_pass(MSG_ALL_BUT_SELF, PPC_MSG_INVALIDATE_TLB); -} - -void smp_send_reschedule(int cpu) -{ - /* - * This is only used if `cpu' is running an idle task, - * so it will reschedule itself anyway... - * - * This isn't the case anymore since the other CPU could be - * sleeping and won't reschedule until the next interrupt (such - * as the timer). - * -- Cort - */ - /* This is only used if `cpu' is running an idle task, - so it will reschedule itself anyway... */ - smp_message_pass(cpu, PPC_MSG_RESCHEDULE); -} - -#ifdef CONFIG_XMON -void smp_send_xmon_break(int cpu) -{ - smp_message_pass(cpu, PPC_MSG_XMON_BREAK); -} -#endif /* CONFIG_XMON */ - -static void stop_this_cpu(void *dummy) -{ - local_irq_disable(); - while (1) - ; -} - -void smp_send_stop(void) -{ - smp_call_function(stop_this_cpu, NULL, 1, 0); -} - -/* - * Structure and data for smp_call_function(). This is designed to minimise - * static memory requirements. It also looks cleaner. - * Stolen from the i386 version. - */ -static DEFINE_SPINLOCK(call_lock); - -static struct call_data_struct { - void (*func) (void *info); - void *info; - atomic_t started; - atomic_t finished; - int wait; -} *call_data; - -/* - * this function sends a 'generic call function' IPI to all other CPUs - * in the system. - */ - -int smp_call_function(void (*func) (void *info), void *info, int nonatomic, - int wait) -/* - * [SUMMARY] Run a function on all other CPUs. - * <func> The function to run. This must be fast and non-blocking. - * <info> An arbitrary pointer to pass to the function. - * <nonatomic> currently unused. - * <wait> If true, wait (atomically) until function has completed on other CPUs. - * [RETURNS] 0 on success, else a negative status code. Does not return until - * remote CPUs are nearly ready to execute <<func>> or are or have executed. - * - * You must not call this function with disabled interrupts or from a - * hardware interrupt handler or from a bottom half handler. - */ -{ - /* FIXME: get cpu lock with hotplug cpus, or change this to - bitmask. --RR */ - if (num_online_cpus() <= 1) - return 0; - /* Can deadlock when called with interrupts disabled */ - WARN_ON(irqs_disabled()); - return __smp_call_function(func, info, wait, MSG_ALL_BUT_SELF); -} - -static int __smp_call_function(void (*func) (void *info), void *info, - int wait, int target) -{ - struct call_data_struct data; - int ret = -1; - int timeout; - int ncpus = 1; - - if (target == MSG_ALL_BUT_SELF) - ncpus = num_online_cpus() - 1; - else if (target == MSG_ALL) - ncpus = num_online_cpus(); - - data.func = func; - data.info = info; - atomic_set(&data.started, 0); - data.wait = wait; - if (wait) - atomic_set(&data.finished, 0); - - spin_lock(&call_lock); - call_data = &data; - /* Send a message to all other CPUs and wait for them to respond */ - smp_message_pass(target, PPC_MSG_CALL_FUNCTION); - - /* Wait for response */ - timeout = 1000000; - while (atomic_read(&data.started) != ncpus) { - if (--timeout == 0) { - printk("smp_call_function on cpu %d: other cpus not responding (%d)\n", - smp_processor_id(), atomic_read(&data.started)); - goto out; - } - barrier(); - udelay(1); - } - - if (wait) { - timeout = 1000000; - while (atomic_read(&data.finished) != ncpus) { - if (--timeout == 0) { - printk("smp_call_function on cpu %d: other cpus not finishing (%d/%d)\n", - smp_processor_id(), atomic_read(&data.finished), atomic_read(&data.started)); - goto out; - } - barrier(); - udelay(1); - } - } - ret = 0; - - out: - spin_unlock(&call_lock); - return ret; -} - -void smp_call_function_interrupt(void) -{ - void (*func) (void *info) = call_data->func; - void *info = call_data->info; - int wait = call_data->wait; - - /* - * Notify initiating CPU that I've grabbed the data and am - * about to execute the function - */ - atomic_inc(&call_data->started); - /* - * At this point the info structure may be out of scope unless wait==1 - */ - (*func)(info); - if (wait) - atomic_inc(&call_data->finished); -} - -static void __devinit smp_store_cpu_info(int id) -{ - struct cpuinfo_PPC *c = &cpu_data[id]; - - /* assume bogomips are same for everything */ - c->loops_per_jiffy = loops_per_jiffy; - c->pvr = mfspr(SPRN_PVR); -} - -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - int num_cpus, i, cpu; - struct task_struct *p; - - /* Fixup boot cpu */ - smp_store_cpu_info(smp_processor_id()); - cpu_callin_map[smp_processor_id()] = 1; - - if (smp_ops == NULL) { - printk("SMP not supported on this machine.\n"); - return; - } - - /* Probe platform for CPUs: always linear. */ - num_cpus = smp_ops->probe(); - - if (num_cpus < 2) - smp_tb_synchronized = 1; - - for (i = 0; i < num_cpus; ++i) - cpu_set(i, cpu_possible_map); - - /* Backup CPU 0 state */ - __save_cpu_setup(); - - for_each_possible_cpu(cpu) { - if (cpu == smp_processor_id()) - continue; - /* create a process for the processor */ - p = fork_idle(cpu); - if (IS_ERR(p)) - panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); - task_thread_info(p)->cpu = cpu; - idle_tasks[cpu] = p; - } -} - -void __devinit smp_prepare_boot_cpu(void) -{ - cpu_set(smp_processor_id(), cpu_online_map); - cpu_set(smp_processor_id(), cpu_possible_map); -} - -int __init setup_profiling_timer(unsigned int multiplier) -{ - return 0; -} - -/* Processor coming up starts here */ -int __devinit start_secondary(void *unused) -{ - int cpu; - - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - - cpu = smp_processor_id(); - smp_store_cpu_info(cpu); - set_dec(tb_ticks_per_jiffy); - preempt_disable(); - cpu_callin_map[cpu] = 1; - - printk("CPU %d done callin...\n", cpu); - smp_ops->setup_cpu(cpu); - printk("CPU %d done setup...\n", cpu); - smp_ops->take_timebase(); - printk("CPU %d done timebase take...\n", cpu); - - spin_lock(&call_lock); - cpu_set(cpu, cpu_online_map); - spin_unlock(&call_lock); - - local_irq_enable(); - - cpu_idle(); - return 0; -} - -int __cpu_up(unsigned int cpu) -{ - char buf[32]; - int c; - - secondary_ti = task_thread_info(idle_tasks[cpu]); - mb(); - - /* - * There was a cache flush loop here to flush the cache - * to memory for the first 8MB of RAM. The cache flush - * has been pushed into the kick_cpu function for those - * platforms that need it. - */ - - /* wake up cpu */ - smp_ops->kick_cpu(cpu); - - /* - * wait to see if the cpu made a callin (is actually up). - * use this value that I found through experimentation. - * -- Cort - */ - for (c = 1000; c && !cpu_callin_map[cpu]; c--) - udelay(100); - - if (!cpu_callin_map[cpu]) { - sprintf(buf, "didn't find cpu %u", cpu); - if (ppc_md.progress) ppc_md.progress(buf, 0x360+cpu); - printk("Processor %u is stuck.\n", cpu); - return -ENOENT; - } - - sprintf(buf, "found cpu %u", cpu); - if (ppc_md.progress) ppc_md.progress(buf, 0x350+cpu); - printk("Processor %d found.\n", cpu); - - smp_ops->give_timebase(); - - /* Wait until cpu puts itself in the online map */ - while (!cpu_online(cpu)) - cpu_relax(); - - return 0; -} - -void smp_cpus_done(unsigned int max_cpus) -{ - smp_ops->setup_cpu(0); -} |