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Subject[PATCH 1/2] riscv: Support irq_work via self IPIs
Date
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>
---
arch/riscv/include/asm/irq_work.h | 10 ++++++++++
arch/riscv/kernel/smp.c | 15 +++++++++++++++
2 files changed, 25 insertions(+)
create mode 100644 arch/riscv/include/asm/irq_work.h

diff --git a/arch/riscv/include/asm/irq_work.h b/arch/riscv/include/asm/irq_work.h
new file mode 100644
index 000000000000..eb9f3d9b15ed
--- /dev/null
+++ b/arch/riscv/include/asm/irq_work.h
@@ -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;
+}
+
+#endif /* _ASM_RISCV_IRQ_WORK_H */
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index b1d4f452f843..554b0fb47060 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -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)
--
2.27.0
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