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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | // SPDX-License-Identifier: GPL-2.0-only /* * Uniprocessor-only support functions. The counterpart to kernel/smp.c */ #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/export.h> #include <linux/smp.h> #include <linux/hypervisor.h> int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int wait) { unsigned long flags; if (cpu != 0) return -ENXIO; local_irq_save(flags); func(info); local_irq_restore(flags); return 0; } EXPORT_SYMBOL(smp_call_function_single); int smp_call_function_single_async(int cpu, call_single_data_t *csd) { unsigned long flags; local_irq_save(flags); csd->func(csd->info); local_irq_restore(flags); return 0; } EXPORT_SYMBOL(smp_call_function_single_async); void on_each_cpu(smp_call_func_t func, void *info, int wait) { unsigned long flags; local_irq_save(flags); func(info); local_irq_restore(flags); } EXPORT_SYMBOL(on_each_cpu); /* * Note we still need to test the mask even for UP * because we actually can get an empty mask from * code that on SMP might call us without the local * CPU in the mask. */ void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, void *info, bool wait) { unsigned long flags; if (cpumask_test_cpu(0, mask)) { local_irq_save(flags); func(info); local_irq_restore(flags); } } EXPORT_SYMBOL(on_each_cpu_mask); /* * Preemption is disabled here to make sure the cond_func is called under the * same condtions in UP and SMP. */ void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, void *info, bool wait, const struct cpumask *mask) { unsigned long flags; preempt_disable(); if (cond_func(0, info)) { local_irq_save(flags); func(info); local_irq_restore(flags); } preempt_enable(); } EXPORT_SYMBOL(on_each_cpu_cond_mask); void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func, void *info, bool wait) { on_each_cpu_cond_mask(cond_func, func, info, wait, NULL); } EXPORT_SYMBOL(on_each_cpu_cond); int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) { int ret; if (cpu != 0) return -ENXIO; if (phys) hypervisor_pin_vcpu(0); ret = func(par); if (phys) hypervisor_pin_vcpu(-1); return ret; } EXPORT_SYMBOL_GPL(smp_call_on_cpu); |