| 1 | |
| 2 | |
| 3 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c
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| 4 |
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| 5 |
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| 6 | #include <linux/interrupt.h>
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| 7 | #include <linux/kernel.h>
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| 8 | #include <linux/export.h>
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| 9 | #include <linux/smp.h>
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| 10 | #include <linux/hypervisor.h>
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| 11 |
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| 12 | int smp_call_function_single(int cpu, void (*func)(void *info), void *info, bool wait)
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| 13 | {
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| 14 | unsigned long flags;
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| 15 |
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| 16 | if (cpu != 0)
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| 17 | return -ENXIO;
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| 18 |
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| 19 | local_irq_save(flags);
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| 20 | func(info);
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| 21 | local_irq_restore(flags);
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| 22 |
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| 23 | return 0;
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| 24 | }
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| 25 | EXPORT_SYMBOL(smp_call_function_single);
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| 26 |
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| 27 | int smp_call_function_single_async(int cpu, call_single_data_t *csd)
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| 28 | {
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| 29 | unsigned long flags;
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| 30 |
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| 31 | local_irq_save(flags);
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| 32 | csd->func(csd->info);
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| 33 | local_irq_restore(flags);
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| 34 | return 0;
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| 35 | }
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| 36 | EXPORT_SYMBOL(smp_call_function_single_async);
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| 37 |
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| 38 | |
| 39 | * Preemption is disabled here to make sure the cond_func is called under the
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| 40 | * same conditions in UP and SMP.
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| 41 |
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| 42 | void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
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| 43 | void *info, bool wait, const struct cpumask *mask)
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| 44 | {
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| 45 | unsigned long flags;
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| 46 |
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| 47 | preempt_disable();
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| 48 | if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
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| 49 | local_irq_save(flags);
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| 50 | func(info);
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| 51 | local_irq_restore(flags);
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| 52 | }
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| 53 | preempt_enable();
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| 54 | }
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| 55 | EXPORT_SYMBOL(on_each_cpu_cond_mask);
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| 56 |
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| 57 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
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| 58 | {
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| 59 | int ret;
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| 60 |
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| 61 | if (cpu != 0)
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| 62 | return -ENXIO;
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| 63 |
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| 64 | if (phys)
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| 65 | hypervisor_pin_vcpu(0);
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| 66 | ret = func(par);
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| 67 | if (phys)
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| 68 | hypervisor_pin_vcpu(-1);
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| 69 |
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| 70 | return ret;
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| 71 | }
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| 72 | EXPORT_SYMBOL_GPL(smp_call_on_cpu);
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