Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c |
| 3 | */ |
| 4 | |
Ingo Molnar | 6e96281 | 2009-01-12 16:04:37 +0100 | [diff] [blame] | 5 | #include <linux/interrupt.h> |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 6 | #include <linux/kernel.h> |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 8 | #include <linux/smp.h> |
Juergen Gross | 47ae4b0 | 2016-08-29 08:48:43 +0200 | [diff] [blame] | 9 | #include <linux/hypervisor.h> |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 10 | |
| 11 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
| 12 | int wait) |
| 13 | { |
David Daney | 081192b | 2013-09-11 14:23:25 -0700 | [diff] [blame] | 14 | unsigned long flags; |
| 15 | |
Ingo Molnar | 93423b8 | 2009-01-11 05:15:21 +0100 | [diff] [blame] | 16 | WARN_ON(cpu != 0); |
| 17 | |
David Daney | 081192b | 2013-09-11 14:23:25 -0700 | [diff] [blame] | 18 | local_irq_save(flags); |
| 19 | func(info); |
| 20 | local_irq_restore(flags); |
Ingo Molnar | 93423b8 | 2009-01-11 05:15:21 +0100 | [diff] [blame] | 21 | |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 22 | return 0; |
| 23 | } |
| 24 | EXPORT_SYMBOL(smp_call_function_single); |
David Daney | fa68820 | 2013-09-11 14:23:24 -0700 | [diff] [blame] | 25 | |
Frederic Weisbecker | c46fff2 | 2014-02-24 16:40:02 +0100 | [diff] [blame] | 26 | int smp_call_function_single_async(int cpu, struct call_single_data *csd) |
Christoph Hellwig | 40c01e8 | 2013-11-14 14:32:08 -0800 | [diff] [blame] | 27 | { |
| 28 | unsigned long flags; |
| 29 | |
| 30 | local_irq_save(flags); |
| 31 | csd->func(csd->info); |
| 32 | local_irq_restore(flags); |
Jan Kara | 08eed44 | 2014-02-24 16:39:57 +0100 | [diff] [blame] | 33 | return 0; |
Christoph Hellwig | 40c01e8 | 2013-11-14 14:32:08 -0800 | [diff] [blame] | 34 | } |
Frederic Weisbecker | c46fff2 | 2014-02-24 16:40:02 +0100 | [diff] [blame] | 35 | EXPORT_SYMBOL(smp_call_function_single_async); |
Christoph Hellwig | 40c01e8 | 2013-11-14 14:32:08 -0800 | [diff] [blame] | 36 | |
David Daney | bff2dc4 | 2013-09-11 14:23:26 -0700 | [diff] [blame] | 37 | int on_each_cpu(smp_call_func_t func, void *info, int wait) |
| 38 | { |
| 39 | unsigned long flags; |
| 40 | |
| 41 | local_irq_save(flags); |
| 42 | func(info); |
| 43 | local_irq_restore(flags); |
| 44 | return 0; |
| 45 | } |
| 46 | EXPORT_SYMBOL(on_each_cpu); |
| 47 | |
David Daney | fa68820 | 2013-09-11 14:23:24 -0700 | [diff] [blame] | 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(bool (*cond_func)(int cpu, void *info), |
| 72 | smp_call_func_t func, void *info, bool wait, |
| 73 | gfp_t gfp_flags) |
| 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); |
Juergen Gross | df8ce9d | 2016-08-29 08:48:44 +0200 | [diff] [blame] | 86 | |
| 87 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) |
| 88 | { |
| 89 | int ret; |
| 90 | |
| 91 | if (cpu != 0) |
| 92 | return -ENXIO; |
| 93 | |
| 94 | if (phys) |
| 95 | hypervisor_pin_vcpu(0); |
| 96 | ret = func(par); |
| 97 | if (phys) |
| 98 | hypervisor_pin_vcpu(-1); |
| 99 | |
| 100 | return ret; |
| 101 | } |
| 102 | EXPORT_SYMBOL_GPL(smp_call_on_cpu); |