| 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,
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| 13 | int wait)
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| 14 | {
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| 15 | unsigned long flags;
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| 16 |
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| 17 | if (cpu != 0)
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| 18 | return -ENXIO;
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| 19 |
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| 20 | local_irq_save(flags);
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| 21 | func(info);
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| 22 | local_irq_restore(flags);
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| 23 |
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| 24 | return 0;
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| 25 | }
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| 26 | EXPORT_SYMBOL(smp_call_function_single);
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| 27 |
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| 28 | int smp_call_function_single_async(int cpu, call_single_data_t *csd)
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| 29 | {
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| 30 | unsigned long flags;
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| 31 |
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| 32 | local_irq_save(flags);
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| 33 | csd->func(csd->info);
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| 34 | local_irq_restore(flags);
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| 35 | return 0;
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| 36 | }
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| 37 | EXPORT_SYMBOL(smp_call_function_single_async);
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| 38 |
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| 39 | void on_each_cpu(smp_call_func_t func, void *info, int wait)
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| 40 | {
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| 41 | unsigned long flags;
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| 42 |
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| 43 | local_irq_save(flags);
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| 44 | func(info);
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| 45 | local_irq_restore(flags);
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| 46 | }
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| 47 | EXPORT_SYMBOL(on_each_cpu);
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| 48 |
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| 49 | |
| 50 | * Note we still need to test the mask even for UP
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| 51 | * because we actually can get an empty mask from
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| 52 | * code that on SMP might call us without the local
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| 53 | * CPU in the mask.
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| 54 |
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| 55 | void on_each_cpu_mask(const struct cpumask *mask,
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| 56 | smp_call_func_t func, void *info, bool wait)
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| 57 | {
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| 58 | unsigned long flags;
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| 59 |
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| 60 | if (cpumask_test_cpu(0, mask)) {
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| 61 | local_irq_save(flags);
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| 62 | func(info);
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| 63 | local_irq_restore(flags);
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| 64 | }
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| 65 | }
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| 66 | EXPORT_SYMBOL(on_each_cpu_mask);
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| 67 |
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| 68 | |
| 69 | * Preemption is disabled here to make sure the cond_func is called under the
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| 70 | * same condtions in UP and SMP.
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| 71 |
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| 72 | void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
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| 73 | void *info, bool wait, const struct cpumask *mask)
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| 74 | {
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| 75 | unsigned long flags;
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| 76 |
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| 77 | preempt_disable();
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| 78 | if (cond_func(0, info)) {
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| 79 | local_irq_save(flags);
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| 80 | func(info);
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| 81 | local_irq_restore(flags);
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| 82 | }
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| 83 | preempt_enable();
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| 84 | }
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| 85 | EXPORT_SYMBOL(on_each_cpu_cond_mask);
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| 86 |
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| 87 | void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func,
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| 88 | void *info, bool wait)
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| 89 | {
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| 90 | on_each_cpu_cond_mask(cond_func, func, info, wait, NULL);
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| 91 | }
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| 92 | EXPORT_SYMBOL(on_each_cpu_cond);
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| 93 |
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| 94 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
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| 95 | {
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| 96 | int ret;
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| 97 |
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| 98 | if (cpu != 0)
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| 99 | return -ENXIO;
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| 100 |
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| 101 | if (phys)
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| 102 | hypervisor_pin_vcpu(0);
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| 103 | ret = func(par);
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| 104 | if (phys)
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| 105 | hypervisor_pin_vcpu(-1);
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| 106 |
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| 107 | return ret;
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| 108 | }
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| 109 | EXPORT_SYMBOL_GPL(smp_call_on_cpu);
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