genirq: Add preflow handler support
sparc64 needs to call a preflow handler on certain interrupts befor
calling the action chain. Integrate it into handle_fasteoi_irq. Must
be enabled via CONFIG_IRQ_FASTEOI_PREFLOW. No impact when disabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David S. Miller <davem@davemloft.net>
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 48ad25f..9149be7 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -35,6 +35,9 @@
config HARDIRQS_SW_RESEND
def_bool n
+config IRQ_PREFLOW_FASTEOI
+ def_bool n
+
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on HAVE_SPARSE_IRQ
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2a36038..08be5d1 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -471,6 +471,16 @@
}
EXPORT_SYMBOL_GPL(handle_level_irq);
+#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
+static inline void preflow_handler(struct irq_desc *desc)
+{
+ if (desc->preflow_handler)
+ desc->preflow_handler(&desc->irq_data);
+}
+#else
+static inline void preflow_handler(struct irq_desc *desc) { }
+#endif
+
/**
* handle_fasteoi_irq - irq handler for transparent controllers
* @irq: the interrupt number
@@ -503,6 +513,7 @@
mask_irq(desc);
goto out;
}
+ preflow_handler(desc);
handle_irq_event(desc);
out:
desc->irq_data.chip->irq_eoi(&desc->irq_data);