linux-kernel - [tip:irq/core] irqdomain: Let irq_find_host default to DOMAIN_BUS

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Message-ID: <tip-6461934371bfc1bfe6b424b197a546b4effd0a32@git.kernel.org>
Date:   Sun, 13 May 2018 07:05:52 -0700
From:   tip-bot for Marc Zyngier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ard.biesheuvel@...aro.org, hpa@...or.com,
        miquel.raynal@...tlin.com, tglx@...utronix.de,
        jason@...edaemon.net, srinivas.kandagatla@...aro.org,
        marc.zyngier@....com, mingo@...nel.org, robh@...nel.org,
        thomas.petazzoni@...tlin.com, linux-kernel@...r.kernel.org
Subject: [tip:irq/core] irqdomain: Let irq_find_host default to
 DOMAIN_BUS_WIRED

Commit-ID:  6461934371bfc1bfe6b424b197a546b4effd0a32
Gitweb:     https://git.kernel.org/tip/6461934371bfc1bfe6b424b197a546b4effd0a32
Author:     Marc Zyngier <marc.zyngier@....com>
AuthorDate: Tue, 8 May 2018 13:14:34 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 13 May 2018 15:59:00 +0200

irqdomain: Let irq_find_host default to DOMAIN_BUS_WIRED

At the beginning of times, irq_find_host() was simple. Each device node
implemented at most one irq domain, and we were happy. Over time, things
have become more complex, and we now have nodes implementing a plurality
of domains, tagged by "bus_token".

Crutially, users of irq_find_host() all expect the most basic domain
to be returned, and not any other domain such as a bus-specific MSI
domain.

So let's change irq_find_host() to first look for a DOMAIN_BUS_WIRED
domain, and only if this fails fallback to DOMAIN_BUS_ANY. Note that
this is consistent with what irq_create_fwspec_mapping is already
doing, see 530cbe100ef7 ("irqdomain: Allow domain lookup with
DOMAIN_BUS_WIRED token").

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Rob Herring <robh@...nel.org>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lkml.kernel.org/r/20180508121438.11301-6-marc.zyngier@arm.com

---
 include/linux/irqdomain.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 48c7e86bb556..dccfa65aee96 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -301,7 +301,13 @@ static inline struct irq_domain *irq_find_matching_host(struct device_node *node
 
 static inline struct irq_domain *irq_find_host(struct device_node *node)
 {
-	return irq_find_matching_host(node, DOMAIN_BUS_ANY);
+	struct irq_domain *d;
+
+	d = irq_find_matching_host(node, DOMAIN_BUS_WIRED);
+	if (!d)
+		d = irq_find_matching_host(node, DOMAIN_BUS_ANY);
+
+	return d;
 }
 
 /**