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[RFC,02/10] genirq: Define irq_ack() and irq_eoi() helpers

Message ID 20210408154326.3988781-3-valentin.schneider@arm.com (mailing list archive)
State New, archived
Headers show
Series irqchip/irq-gic: Optimize masking by leveraging EOImode=1 | expand

Commit Message

Valentin Schneider April 8, 2021, 3:43 p.m. UTC 
The newly-added IRQCHIP_AUTOMASKS_FLOW flag requires some additional
bookkeeping around chip->{irq_ack, irq_eoi}() calls. Define wrappers around
those chip callbacks to drive the IRQD_IRQ_FLOW_MASKED state of an IRQ when
the chip has the IRQCHIP_AUTOMASKS_FLOW flag.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
 kernel/irq/chip.c      | 16 ++++++++++++++++
 kernel/irq/internals.h |  2 ++
 2 files changed, 18 insertions(+)
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Patch

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 18c3b0e1568a..046b4486c88c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -408,6 +408,22 @@  void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 	cpumask_clear_cpu(cpu, desc->percpu_enabled);
 }
 
+void ack_irq(struct irq_desc *desc)
+{
+	desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+	if (desc->irq_data.chip->flags & IRQCHIP_AUTOMASKS_FLOW)
+		irq_state_set_flow_masked(desc);
+}
+
+void eoi_irq(struct irq_desc *desc)
+{
+	desc->irq_data.chip->irq_eoi(&desc->irq_data);
+
+	if (desc->irq_data.chip->flags & IRQCHIP_AUTOMASKS_FLOW)
+		irq_state_clr_flow_masked(desc);
+}
+
 static inline void mask_ack_irq(struct irq_desc *desc)
 {
 	if (desc->irq_data.chip->irq_mask_ack) {
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index b6c1cceddec0..090bd7868845 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -87,6 +87,8 @@  extern void irq_enable(struct irq_desc *desc);
 extern void irq_disable(struct irq_desc *desc);
 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
+extern void irq_ack(struct irq_desc *desc);
+extern void irq_eoi(struct irq_desc *desc);
 extern void mask_irq(struct irq_desc *desc);
 extern void unmask_irq(struct irq_desc *desc);
 extern void unmask_threaded_irq(struct irq_desc *desc);