projects / mirror_ubuntu-jammy-kernel.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 | ||
| 1e474b28 PM |
17 | if (cpu != 0) |
| 18 | return -ENXIO; | |
| 93423b86 | 19 | |
| 081192b2 DD |
20 | local_irq_save(flags); |
| 21 | func(info); | |
| 22 | local_irq_restore(flags); | |
| 93423b86 | 23 | |
| 53ce3d95 AM |
24 | return 0; |
| 25 | } | |
| 26 | EXPORT_SYMBOL(smp_call_function_single); | |
| fa688207 | 27 | |
| 1139aeb1 | 28 | int smp_call_function_single_async(int cpu, struct __call_single_data *csd) |
| 40c01e8b CH |
29 | { |
| 30 | unsigned long flags; | |
| 31 | ||
| 32 | local_irq_save(flags); | |
| 33 | csd->func(csd->info); | |
| 34 | local_irq_restore(flags); | |
| 08eed44c | 35 | return 0; |
| 40c01e8b | 36 | } |
| c46fff2a | 37 | EXPORT_SYMBOL(smp_call_function_single_async); |
| 40c01e8b | 38 | |
| fa688207 DD |
39 | /* |
| 40 | * Preemption is disabled here to make sure the cond_func is called under the | |
| f0fffaff | 41 | * same conditions in UP and SMP. |
| fa688207 | 42 | */ |
| 5671d814 | 43 | void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, |
| cb923159 | 44 | void *info, bool wait, const struct cpumask *mask) |
| fa688207 DD |
45 | { |
| 46 | unsigned long flags; | |
| 47 | ||
| 48 | preempt_disable(); | |
| a5aa5ce3 | 49 | if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) { |
| fa688207 DD |
50 | local_irq_save(flags); |
| 51 | func(info); | |
| 52 | local_irq_restore(flags); | |
| 53 | } | |
| 54 | preempt_enable(); | |
| 55 | } | |
| 7d49b28a RR |
56 | EXPORT_SYMBOL(on_each_cpu_cond_mask); |
| 57 | ||
| df8ce9d7 JG |
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); |