Commit 08f417db authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Add irq_work support via self IPIs 



Add irq_work support for LoongArch via self IPIs. This make it possible
to run works in hardware interrupt context, which is a prerequisite for
NOHZ_FULL.

Implement:
 - arch_irq_work_raise()
 - arch_irq_work_has_interrupt()

Reviewed-by: default avatarGuo Ren <guoren@kernel.org>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 12d3b559

arch/loongarch/include/asm/hardirq.h

+2 −1
Original line number Diff line number Diff line
@@ -12,11 +12,12 @@ 
extern void ack_bad_irq(unsigned int irq);

#define ack_bad_irq ack_bad_irq



#define NR_IPI	2

#define NR_IPI	3



enum ipi_msg_type {

	IPI_RESCHEDULE,

	IPI_CALL_FUNCTION,

	IPI_IRQ_WORK,

};



typedef struct {

arch/loongarch/include/asm/irq_work.h

0 → 100644
+10 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_LOONGARCH_IRQ_WORK_H

#define _ASM_LOONGARCH_IRQ_WORK_H



static inline bool arch_irq_work_has_interrupt(void)

{

	return IS_ENABLED(CONFIG_SMP);

}



#endif /* _ASM_LOONGARCH_IRQ_WORK_H */

arch/loongarch/include/asm/smp.h

+2 −0
Original line number Diff line number Diff line
@@ -69,9 +69,11 @@ extern int __cpu_logical_map[NR_CPUS]; 
#define ACTION_BOOT_CPU	0

#define ACTION_RESCHEDULE	1

#define ACTION_CALL_FUNCTION	2

#define ACTION_IRQ_WORK		3

#define SMP_BOOT_CPU		BIT(ACTION_BOOT_CPU)

#define SMP_RESCHEDULE		BIT(ACTION_RESCHEDULE)

#define SMP_CALL_FUNCTION	BIT(ACTION_CALL_FUNCTION)

#define SMP_IRQ_WORK		BIT(ACTION_IRQ_WORK)



struct secondary_data {

	unsigned long stack;

arch/loongarch/kernel/paravirt.c

+6 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#include <linux/export.h>

#include <linux/types.h>

#include <linux/interrupt.h>

#include <linux/irq_work.h>

#include <linux/jump_label.h>

#include <linux/kvm_para.h>

#include <linux/static_call.h>
@@ -97,6 +98,11 @@ static irqreturn_t pv_ipi_interrupt(int irq, void *dev) 
		info->ipi_irqs[IPI_CALL_FUNCTION]++;

	}



	if (action & SMP_IRQ_WORK) {

		irq_work_run();

		info->ipi_irqs[IPI_IRQ_WORK]++;

	}



	return IRQ_HANDLED;

}

arch/loongarch/kernel/smp.c

+14 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/cpumask.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/irq_work.h>

#include <linux/profile.h>

#include <linux/seq_file.h>

#include <linux/smp.h>
@@ -70,6 +71,7 @@ static DEFINE_PER_CPU(int, cpu_state); 
static const char *ipi_types[NR_IPI] __tracepoint_string = {

	[IPI_RESCHEDULE] = "Rescheduling interrupts",

	[IPI_CALL_FUNCTION] = "Function call interrupts",

	[IPI_IRQ_WORK] = "IRQ work interrupts",

};



void show_ipi_list(struct seq_file *p, int prec)
@@ -217,6 +219,13 @@ void arch_smp_send_reschedule(int cpu) 
}

EXPORT_SYMBOL_GPL(arch_smp_send_reschedule);



#ifdef CONFIG_IRQ_WORK

void arch_irq_work_raise(void)

{

	mp_ops.send_ipi_single(smp_processor_id(), ACTION_IRQ_WORK);

}

#endif



static irqreturn_t loongson_ipi_interrupt(int irq, void *dev)

{

	unsigned int action;
@@ -234,6 +243,11 @@ static irqreturn_t loongson_ipi_interrupt(int irq, void *dev) 
		per_cpu(irq_stat, cpu).ipi_irqs[IPI_CALL_FUNCTION]++;

	}



	if (action & SMP_IRQ_WORK) {

		irq_work_run();

		per_cpu(irq_stat, cpu).ipi_irqs[IPI_IRQ_WORK]++;

	}



	return IRQ_HANDLED;

}