| | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| | 2 | /* |
| | 3 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c |
| | 4 | */ |
| | 5 | |
| | 6 | #include <linux/interrupt.h> |
| | 7 | #include <linux/kernel.h> |
| | 8 | #include <linux/export.h> |
| | 9 | #include <linux/smp.h> |
| | 10 | #include <linux/hypervisor.h> |
| | 11 | |
| | 12 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
| | 13 | int wait) |
| | 14 | { |
| | 15 | unsigned long flags; |
| | 16 | |
| | 17 | WARN_ON(cpu != 0); |
| | 18 | |
| | 19 | local_irq_save(flags); |
| | 20 | func(info); |
| | 21 | local_irq_restore(flags); |
| | 22 | |
| | 23 | return 0; |
| | 24 | } |
| | 25 | EXPORT_SYMBOL(smp_call_function_single); |
| | 26 | |
| | 27 | int smp_call_function_single_async(int cpu, call_single_data_t *csd) |
| | 28 | { |
| | 29 | unsigned long flags; |
| | 30 | |
| | 31 | local_irq_save(flags); |
| | 32 | csd->func(csd->info); |
| | 33 | local_irq_restore(flags); |
| | 34 | return 0; |
| | 35 | } |
| | 36 | EXPORT_SYMBOL(smp_call_function_single_async); |
| | 37 | |
| | 38 | void on_each_cpu(smp_call_func_t func, void *info, int wait) |
| | 39 | { |
| | 40 | unsigned long flags; |
| | 41 | |
| | 42 | local_irq_save(flags); |
| | 43 | func(info); |
| | 44 | local_irq_restore(flags); |
| | 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_mask(bool (*cond_func)(int cpu, void *info), |
| | 72 | smp_call_func_t func, void *info, bool wait, |
| | 73 | gfp_t gfp_flags, const struct cpumask *mask) |
| | 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_mask); |
| | 86 | |
| | 87 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), |
| | 88 | smp_call_func_t func, void *info, bool wait, |
| | 89 | gfp_t gfp_flags) |
| | 90 | { |
| | 91 | on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL); |
| | 92 | } |
| | 93 | EXPORT_SYMBOL(on_each_cpu_cond); |
| | 94 | |
| | 95 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) |
| | 96 | { |
| | 97 | int ret; |
| | 98 | |
| | 99 | if (cpu != 0) |
| | 100 | return -ENXIO; |
| | 101 | |
| | 102 | if (phys) |
| | 103 | hypervisor_pin_vcpu(0); |
| | 104 | ret = func(par); |
| | 105 | if (phys) |
| | 106 | hypervisor_pin_vcpu(-1); |
| | 107 | |
| | 108 | return ret; |
| | 109 | } |
| | 110 | EXPORT_SYMBOL_GPL(smp_call_on_cpu); |
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