csky: Add irq_work support

Running work in hardware interrupt context for csky. Implement:
 - arch_irq_work_raise()
 - arch_irq_work_has_interrupt()

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/csky/include/asm/irq_work.h b/arch/csky/include/asm/irq_work.h
new file mode 100644 (file)
index 0000000..33aaf39
--- /dev/null
+++ b/arch/csky/include/asm/irq_work.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_IRQ_WORK_H
+#define __ASM_CSKY_IRQ_WORK_H
+
+static inline bool arch_irq_work_has_interrupt(void)
+{
+       return true;
+}
+extern void arch_irq_work_raise(void);
+#endif /* __ASM_CSKY_IRQ_WORK_H */

diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index 1945fb29007dcd988fcd0d0f9e6932bca7afa707..60f2ab1c5865a528f704caec17ae363b3ad4db1a 100644 (file)
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -12,6 +12,7 @@
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/irq.h>
+#include <linux/irq_work.h>
 #include <linux/irqdomain.h>
 #include <linux/of.h>
 #include <linux/sched/task_stack.h>
@@ -35,6 +36,7 @@ enum ipi_message_type {
        IPI_EMPTY,
        IPI_RESCHEDULE,
        IPI_CALL_FUNC,
+       IPI_IRQ_WORK,
        IPI_MAX
 };
 
@@ -53,6 +55,9 @@ static irqreturn_t handle_ipi(int irq, void *dev)
                if (ops & (1 << IPI_CALL_FUNC))
                        generic_smp_call_function_interrupt();
 
+               if (ops & (1 << IPI_IRQ_WORK))
+                       irq_work_run();
+
                BUG_ON((ops >> IPI_MAX) != 0);
        }
 
@@ -108,6 +113,13 @@ void smp_send_reschedule(int cpu)
        send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
 }
 
+#ifdef CONFIG_IRQ_WORK
+void arch_irq_work_raise(void)
+{
+       send_ipi_message(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
+}
+#endif
+
 void __init smp_prepare_boot_cpu(void)
 {
 }