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 if (cpu != 0) 18 return -ENXIO; 19 20 local_irq_save(flags); 21 func(info); 22 local_irq_restore(flags); 23 24 return 0; 25 } 26 EXPORT_SYMBOL(smp_call_function_single); 27 28 int smp_call_function_single_async(int cpu, struct __call_single_data *csd) 29 { 30 unsigned long flags; 31 32 local_irq_save(flags); 33 csd->func(csd->info); 34 local_irq_restore(flags); 35 return 0; 36 } 37 EXPORT_SYMBOL(smp_call_function_single_async); 38 39 /* 40 * Preemption is disabled here to make sure the cond_func is called under the 41 * same conditions in UP and SMP. 42 */ 43 void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, 44 void *info, bool wait, const struct cpumask *mask) 45 { 46 unsigned long flags; 47 48 preempt_disable(); 49 if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) { 50 local_irq_save(flags); 51 func(info); 52 local_irq_restore(flags); 53 } 54 preempt_enable(); 55 } 56 EXPORT_SYMBOL(on_each_cpu_cond_mask); 57 58 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) 59 { 60 int ret; 61 62 if (cpu != 0) 63 return -ENXIO; 64 65 if (phys) 66 hypervisor_pin_vcpu(0); 67 ret = func(par); 68 if (phys) 69 hypervisor_pin_vcpu(-1); 70 71 return ret; 72 } 73 EXPORT_SYMBOL_GPL(smp_call_on_cpu); 74