diff options
Diffstat (limited to 'arch/mips/kernel/smp.c')
| -rw-r--r-- | arch/mips/kernel/smp.c | 69 |
1 files changed, 57 insertions, 12 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 67edfa7ed93a..73b0dab02668 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -30,6 +30,7 @@ #include <linux/sched.h> #include <linux/cpumask.h> #include <linux/cpu.h> +#include <linux/err.h> #include <asm/atomic.h> #include <asm/cpu.h> @@ -51,18 +52,8 @@ int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */ EXPORT_SYMBOL(phys_cpu_present_map); EXPORT_SYMBOL(cpu_online_map); -/* This happens early in bootup, can't really do it better */ -static void smp_tune_scheduling (void) -{ - struct cache_desc *cd = ¤t_cpu_data.scache; - unsigned long cachesize = cd->linesz * cd->sets * cd->ways; - - if (cachesize > max_cache_size) - max_cache_size = cachesize; -} - extern void __init calibrate_delay(void); -extern ATTRIB_NORET void cpu_idle(void); +extern void cpu_idle(void); /* * First C code run on the secondary CPUs after being started up by @@ -203,6 +194,61 @@ void smp_call_function_interrupt(void) } } +int smp_call_function_single(int cpu, void (*func) (void *info), void *info, + int retry, int wait) +{ + struct call_data_struct data; + int me; + + /* + * Can die spectacularly if this CPU isn't yet marked online + */ + if (!cpu_online(cpu)) + return 0; + + me = get_cpu(); + BUG_ON(!cpu_online(me)); + + if (cpu == me) { + local_irq_disable(); + func(info); + local_irq_enable(); + put_cpu(); + return 0; + } + + /* Can deadlock when called with interrupts disabled */ + WARN_ON(irqs_disabled()); + + data.func = func; + data.info = info; + atomic_set(&data.started, 0); + data.wait = wait; + if (wait) + atomic_set(&data.finished, 0); + + spin_lock(&smp_call_lock); + call_data = &data; + smp_mb(); + + /* Send a message to the other CPU */ + core_send_ipi(cpu, SMP_CALL_FUNCTION); + + /* Wait for response */ + /* FIXME: lock-up detection, backtrace on lock-up */ + while (atomic_read(&data.started) != 1) + barrier(); + + if (wait) + while (atomic_read(&data.finished) != 1) + barrier(); + call_data = NULL; + spin_unlock(&smp_call_lock); + + put_cpu(); + return 0; +} + static void stop_this_cpu(void *dummy) { /* @@ -228,7 +274,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus) { init_new_context(current, &init_mm); current_thread_info()->cpu = 0; - smp_tune_scheduling(); plat_prepare_cpus(max_cpus); #ifndef CONFIG_HOTPLUG_CPU cpu_present_map = cpu_possible_map; |