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riscv: Support irq_work via self IPIs 

Support for arch_irq_work_raise() and arch_irq_work_has_interrupt() was
missing from riscv (a prerequisite for FULL_NOHZ).

Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Greentime Hu 2020-06-24 17:03:15 +08:00 committed by Palmer Dabbelt
parent 3c46979829
commit 298447928b
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
2 changed files with 25 additions and 0 deletions
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10
arch/riscv/include/asm/irq_work.h Normal file
View File

@ -0,0 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_IRQ_WORK_H
#define _ASM_RISCV_IRQ_WORK_H
static inline bool arch_irq_work_has_interrupt(void)
{
return true;
}
extern void arch_irq_work_raise(void);
#endif /* _ASM_RISCV_IRQ_WORK_H */

15
arch/riscv/kernel/smp.c
View File

@ -16,6 +16,7 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/irq_work.h>
#include <asm/clint.h>
#include <asm/sbi.h>
@ -26,6 +27,7 @@ enum ipi_message_type {
IPI_RESCHEDULE,
IPI_CALL_FUNC,
IPI_CPU_STOP,
IPI_IRQ_WORK,
IPI_MAX
};
@ -123,6 +125,13 @@ static inline void clear_ipi(void)
clint_clear_ipi(cpuid_to_hartid_map(smp_processor_id()));
}
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
send_ipi_single(smp_processor_id(), IPI_IRQ_WORK);
}
#endif
void handle_IPI(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
@ -158,6 +167,11 @@ void handle_IPI(struct pt_regs *regs)
ipi_stop();
}
if (ops & (1 << IPI_IRQ_WORK)) {
stats[IPI_IRQ_WORK]++;
irq_work_run();
}
BUG_ON((ops >> IPI_MAX) != 0);
/* Order data access and bit testing. */
@ -173,6 +187,7 @@ static const char * const ipi_names[] = {
[IPI_RESCHEDULE] = "Rescheduling interrupts",
[IPI_CALL_FUNC] = "Function call interrupts",
[IPI_CPU_STOP] = "CPU stop interrupts",
[IPI_IRQ_WORK] = "IRQ work interrupts",
};
void show_ipi_stats(struct seq_file *p, int prec)