| 1 | |
| 2 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c
|
| 3 |
|
| 4 |
|
| 5 | #include <linux/interrupt.h>
|
| 6 | #include <linux/kernel.h>
|
| 7 | #include <linux/export.h>
|
| 8 | #include <linux/smp.h>
|
| 9 | #include <linux/hypervisor.h>
|
| 10 |
|
| 11 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
|
| 12 | int wait)
|
| 13 | {
|
| 14 | unsigned long flags;
|
| 15 |
|
| 16 | WARN_ON(cpu != 0);
|
| 17 |
|
| 18 | local_irq_save(flags);
|
| 19 | func(info);
|
| 20 | local_irq_restore(flags);
|
| 21 |
|
| 22 | return 0;
|
| 23 | }
|
| 24 | EXPORT_SYMBOL(smp_call_function_single);
|
| 25 |
|
| 26 | int smp_call_function_single_async(int cpu, struct call_single_data *csd)
|
| 27 | {
|
| 28 | unsigned long flags;
|
| 29 |
|
| 30 | local_irq_save(flags);
|
| 31 | csd->func(csd->info);
|
| 32 | local_irq_restore(flags);
|
| 33 | return 0;
|
| 34 | }
|
| 35 | EXPORT_SYMBOL(smp_call_function_single_async);
|
| 36 |
|
| 37 | int on_each_cpu(smp_call_func_t func, void *info, int wait)
|
| 38 | {
|
| 39 | unsigned long flags;
|
| 40 |
|
| 41 | local_irq_save(flags);
|
| 42 | func(info);
|
| 43 | local_irq_restore(flags);
|
| 44 | return 0;
|
| 45 | }
|
| 46 | EXPORT_SYMBOL(on_each_cpu);
|
| 47 |
|
| 48 | |
| 49 | * Note we still need to test the mask even for UP
|
| 50 | * because we actually can get an empty mask from
|
| 51 | * code that on SMP might call us without the local
|
| 52 | * CPU in the mask.
|
| 53 |
|
| 54 | void on_each_cpu_mask(const struct cpumask *mask,
|
| 55 | smp_call_func_t func, void *info, bool wait)
|
| 56 | {
|
| 57 | unsigned long flags;
|
| 58 |
|
| 59 | if (cpumask_test_cpu(0, mask)) {
|
| 60 | local_irq_save(flags);
|
| 61 | func(info);
|
| 62 | local_irq_restore(flags);
|
| 63 | }
|
| 64 | }
|
| 65 | EXPORT_SYMBOL(on_each_cpu_mask);
|
| 66 |
|
| 67 | |
| 68 | * Preemption is disabled here to make sure the cond_func is called under the
|
| 69 | * same condtions in UP and SMP.
|
| 70 |
|
| 71 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
|
| 72 | smp_call_func_t func, void *info, bool wait,
|
| 73 | gfp_t gfp_flags)
|
| 74 | {
|
| 75 | unsigned long flags;
|
| 76 |
|
| 77 | preempt_disable();
|
| 78 | if (cond_func(0, info)) {
|
| 79 | local_irq_save(flags);
|
| 80 | func(info);
|
| 81 | local_irq_restore(flags);
|
| 82 | }
|
| 83 | preempt_enable();
|
| 84 | }
|
| 85 | EXPORT_SYMBOL(on_each_cpu_cond);
|
| 86 |
|
| 87 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
|
| 88 | {
|
| 89 | int ret;
|
| 90 |
|
| 91 | if (cpu != 0)
|
| 92 | return -ENXIO;
|
| 93 |
|
| 94 | if (phys)
|
| 95 | hypervisor_pin_vcpu(0);
|
| 96 | ret = func(par);
|
| 97 | if (phys)
|
| 98 | hypervisor_pin_vcpu(-1);
|
| 99 |
|
| 100 | return ret;
|
| 101 | }
|
| 102 | EXPORT_SYMBOL_GPL(smp_call_on_cpu);
|