linux-kernel - [RFC PATCH 2/5] irq: Show the parent chained interrupt in debugfs

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Message-Id: <20230530214550.864894-3-rrendec@redhat.com>
Date:   Tue, 30 May 2023 17:45:47 -0400
From:   Radu Rendec <rrendec@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 2/5] irq: Show the parent chained interrupt in debugfs

This is a trivial change to expose the parent chained interrupt. The
intention is to make it easier to debug chained interrupts, particularly
in the context of setting the SMP affinity.

Signed-off-by: Radu Rendec <rrendec@...hat.com>
---
 kernel/irq/debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index bbcaac64038ef..3ada976df8612 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -177,6 +177,7 @@ static int irq_debug_show(struct seq_file *m, void *p)
 			    ARRAY_SIZE(irqdesc_istates));
 	seq_printf(m, "ddepth:   %u\n", desc->depth);
 	seq_printf(m, "wdepth:   %u\n", desc->wake_depth);
+	seq_printf(m, "parent:   %d\n", desc->parent_irq);
 	seq_printf(m, "dstate:   0x%08x\n", irqd_get(data));
 	irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
 			    ARRAY_SIZE(irqdata_states));
-- 
2.40.1