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s390/smp: implement arch_irq_work_raise() 

The immediate need to have this is to have bpf_send_signal() send the
signal ASAP instead of during the next hrtimer interrupt. However, it
should also improve irq_work_queue() latencies in general, as well as
get s390 out of the lame architectures list [1].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/irq_work.c?h=v5.11#n45

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Ilya Leoshkevich 2021-02-19 23:32:56 +01:00 committed by Vasily Gorbik
parent da6d2c289d
commit 55f03123f6
2 changed files with 23 additions and 0 deletions
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12
arch/s390/include/asm/irq_work.h Normal file
View File

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_IRQ_WORK_H
#define _ASM_S390_IRQ_WORK_H
static inline bool arch_irq_work_has_interrupt(void)
{
return true;
}
void arch_irq_work_raise(void);
#endif /* _ASM_S390_IRQ_WORK_H */

11
arch/s390/kernel/smp.c
View File

@ -30,6 +30,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/irqflags.h> #include <linux/irqflags.h>
#include <linux/irq_work.h>
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/sched/hotplug.h> #include <linux/sched/hotplug.h>
@ -62,6 +63,7 @@ enum {
ec_call_function_single, ec_call_function_single,
ec_stop_cpu, ec_stop_cpu,
ec_mcck_pending, ec_mcck_pending,
ec_irq_work,
}; };
enum { enum {
@ -508,6 +510,8 @@ static void smp_handle_ext_call(void)
generic_smp_call_function_single_interrupt(); generic_smp_call_function_single_interrupt();
if (test_bit(ec_mcck_pending, &bits)) if (test_bit(ec_mcck_pending, &bits))
__s390_handle_mcck(); __s390_handle_mcck();
if (test_bit(ec_irq_work, &bits))
irq_work_run();
} }
static void do_ext_call_interrupt(struct ext_code ext_code, static void do_ext_call_interrupt(struct ext_code ext_code,
@ -540,6 +544,13 @@ void smp_send_reschedule(int cpu)
pcpu_ec_call(pcpu_devices + cpu, ec_schedule); pcpu_ec_call(pcpu_devices + cpu, ec_schedule);
} }
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
pcpu_ec_call(pcpu_devices + smp_processor_id(), ec_irq_work);
}
#endif
/* /*
* parameter area for the set/clear control bit callbacks * parameter area for the set/clear control bit callbacks
*/ */