Eric Lee / smarc-fsl-linux-kernel

Blame view

kernel/up.c 2.02 KB
edit raw normal view history
81f7e3824   Eric Lee   Initial Release, ... 
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
 
  /*
   * 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;
  
  	WARN_ON(cpu != 0);
  
  	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);
  
  int 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);
  	return 0;
  }
  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(bool (*cond_func)(int cpu, void *info),
  		      smp_call_func_t func, void *info, bool wait,
  		      gfp_t gfp_flags)
  {
  	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);
  
  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);