linux-kernel - [PATCH 2/4] irqdomain: Let irq_domain_mapping display ACPI fwnode attributes

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Date:   Fri, 12 May 2017 12:55:36 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 2/4] irqdomain: Let irq_domain_mapping display ACPI fwnode attributes

If we're using ACPI, there is no of_node to display. But ACPI can
use a struct irqchip_fwid as a domain identifier, and we can
display the name contained in that structure.

We end-up with something like this:

 pMSI      0           0           0  irqchip@...00000e1180000
 MSI      37           0           0  irqchip@...00000e1180000
 GICv2m   37           0           0  irqchip@...00000e1180000
 GICv2   448         448           0  irqchip@...f000008003000

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 kernel/irq/irqdomain.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 1f6cd2cacf74..70b9da72018b 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -801,15 +801,26 @@ static int virq_debug_show(struct seq_file *m, void *private)
 	mutex_lock(&irq_domain_mutex);
 	list_for_each_entry(domain, &irq_domain_list, link) {
 		struct device_node *of_node;
+		const char *name;
+
 		int count = 0;
+
 		of_node = irq_domain_get_of_node(domain);
+		if (of_node)
+			name = of_node_full_name(of_node);
+		else if (is_fwnode_irqchip(domain->fwnode))
+			name = container_of(domain->fwnode, struct irqchip_fwid,
+					    fwnode)->name;
+		else
+			name = "";
+
 		radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
 			count++;
 		seq_printf(m, "%c%-16s  %6u  %10u  %10u  %s\n",
 			   domain == irq_default_domain ? '*' : ' ', domain->name,
 			   domain->revmap_size + count, domain->revmap_size,
 			   domain->revmap_direct_max_irq,
-			   of_node ? of_node_full_name(of_node) : "");
+			   name);
 	}
 	mutex_unlock(&irq_domain_mutex);
 
-- 
2.11.0