iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

LoongArch: Add irq_work support via self IPIs

Browse Source 
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: Guo Ren <guoren@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2024-07-20 22:40:58 +08:00
parent 12d3b559b8
commit 08f417db70
5 changed files with 34 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/loongarch/include/asm/hardirq.h
View File

@ -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 {

10
arch/loongarch/include/asm/irq_work.h Normal file
View File

@ -0,0 +1,10 @@
/* 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 */

2
arch/loongarch/include/asm/smp.h
View File

@ -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;

6
arch/loongarch/kernel/paravirt.c
View File

@ -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;
}

14
arch/loongarch/kernel/smp.c
View File

@ -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;
}