projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 53ce3d95 AM |
2 | /* |
| 3 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c | |
| 4 | */ | |
| 5 | ||
| 6e962814 | 6 | #include <linux/interrupt.h> |
| 53ce3d95 | 7 | #include <linux/kernel.h> |
| 9984de1a | 8 | #include <linux/export.h> |
| 53ce3d95 | 9 | #include <linux/smp.h> |
| 47ae4b05 | 10 | #include <linux/hypervisor.h> |
| 53ce3d95 AM |
11 | |
| 12 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, | |
| 13 | int wait) | |
| 14 | { | |
| 081192b2 DD |
15 | unsigned long flags; |
| 16 | ||
| 93423b86 IM |
17 | WARN_ON(cpu != 0); |
| 18 | ||
| 081192b2 DD |
19 | local_irq_save(flags); |
| 20 | func(info); | |
| 21 | local_irq_restore(flags); | |
| 93423b86 | 22 | |
| 53ce3d95 AM |
23 | return 0; |
| 24 | } | |
| 25 | EXPORT_SYMBOL(smp_call_function_single); | |
| fa688207 | 26 | |
| 966a9671 | 27 | int smp_call_function_single_async(int cpu, call_single_data_t *csd) |
| 40c01e8b CH |
28 | { |
| 29 | unsigned long flags; | |
| 30 | ||
| 31 | local_irq_save(flags); | |
| 32 | csd->func(csd->info); | |
| 33 | local_irq_restore(flags); | |
| 08eed44c | 34 | return 0; |
| 40c01e8b | 35 | } |
| c46fff2a | 36 | EXPORT_SYMBOL(smp_call_function_single_async); |
| 40c01e8b | 37 | |
| caa75932 | 38 | void on_each_cpu(smp_call_func_t func, void *info, int wait) |
| bff2dc42 DD |
39 | { |
| 40 | unsigned long flags; | |
| 41 | ||
| 42 | local_irq_save(flags); | |
| 43 | func(info); | |
| 44 | local_irq_restore(flags); | |
| bff2dc42 DD |
45 | } |
| 46 | EXPORT_SYMBOL(on_each_cpu); | |
| 47 | ||
| fa688207 DD |
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 | */ | |
| 7d49b28a RR |
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) | |
| fa688207 DD |
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 | } | |
| 7d49b28a RR |
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 | } | |
| fa688207 | 93 | EXPORT_SYMBOL(on_each_cpu_cond); |
| df8ce9d7 JG |
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); |