[thirdparty/linux.git] / kernel / up.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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_mask(bool (*cond_func)(int cpu, void *info),
			   smp_call_func_t func, void *info, bool wait,
			   gfp_t gfp_flags, const struct cpumask *mask)
{
	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_mask);

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)
{
	on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
}
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);
Commit	Line	Data
	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	WARN_ON(cpu != 0);
	18
	19	local_irq_save(flags);
	20	func(info);
	21	local_irq_restore(flags);
	22
	23	return 0;
	24	}
	25	EXPORT_SYMBOL(smp_call_function_single);
	26
	27	int smp_call_function_single_async(int cpu, call_single_data_t *csd)
	28	{
	29	unsigned long flags;
	30
	31	local_irq_save(flags);
	32	csd->func(csd->info);
	33	local_irq_restore(flags);
	34	return 0;
	35	}
	36	EXPORT_SYMBOL(smp_call_function_single_async);
	37
	38	int on_each_cpu(smp_call_func_t func, void *info, int wait)
	39	{
	40	unsigned long flags;
	41
	42	local_irq_save(flags);
	43	func(info);
	44	local_irq_restore(flags);
	45	return 0;
	46	}
	47	EXPORT_SYMBOL(on_each_cpu);
	48
	49	/*
	50	* Note we still need to test the mask even for UP
	51	* because we actually can get an empty mask from
	52	* code that on SMP might call us without the local
	53	* CPU in the mask.
	54	*/
	55	void on_each_cpu_mask(const struct cpumask *mask,
	56	smp_call_func_t func, void *info, bool wait)
	57	{
	58	unsigned long flags;
	59
	60	if (cpumask_test_cpu(0, mask)) {
	61	local_irq_save(flags);
	62	func(info);
	63	local_irq_restore(flags);
	64	}
	65	}
	66	EXPORT_SYMBOL(on_each_cpu_mask);
	67
	68	/*
	69	* Preemption is disabled here to make sure the cond_func is called under the
	70	* same condtions in UP and SMP.
	71	*/
	72	void on_each_cpu_cond_mask(bool (cond_func)(int cpu, void info),
	73	smp_call_func_t func, void *info, bool wait,
	74	gfp_t gfp_flags, const struct cpumask *mask)
	75	{
	76	unsigned long flags;
	77
	78	preempt_disable();
	79	if (cond_func(0, info)) {
	80	local_irq_save(flags);
	81	func(info);
	82	local_irq_restore(flags);
	83	}
	84	preempt_enable();
	85	}
	86	EXPORT_SYMBOL(on_each_cpu_cond_mask);
	87
	88	void on_each_cpu_cond(bool (cond_func)(int cpu, void info),
	89	smp_call_func_t func, void *info, bool wait,
	90	gfp_t gfp_flags)
	91	{
	92	on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
	93	}
	94	EXPORT_SYMBOL(on_each_cpu_cond);
	95
	96	int smp_call_on_cpu(unsigned int cpu, int (func)(void ), void *par, bool phys)
	97	{
	98	int ret;
	99
	100	if (cpu != 0)
	101	return -ENXIO;
	102
	103	if (phys)
	104	hypervisor_pin_vcpu(0);
	105	ret = func(par);
	106	if (phys)
	107	hypervisor_pin_vcpu(-1);
	108
	109	return ret;
	110	}
	111	EXPORT_SYMBOL_GPL(smp_call_on_cpu);