linux-kernel - [PATCH 25/39] genirq: Add generic_handle_domain

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Date:   Thu, 20 May 2021 17:37:37 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        kernel-team@...roid.com
Subject: [PATCH 25/39] genirq: Add generic_handle_domain_irq() helper

Provide generic_handle_domain_irq() as a pendent to handle_domain_irq()
for non-root interrupt controllers

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 include/linux/irqdesc.h |  2 ++
 kernel/irq/irqdesc.c    | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 2971eb7e65f1..0f226c6b0c70 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -170,6 +170,8 @@ int generic_handle_irq(unsigned int irq);
 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 			bool lookup, struct pt_regs *regs);
 
+int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq);
+
 static inline int handle_domain_irq(struct irq_domain *domain,
 				    unsigned int hwirq, struct pt_regs *regs)
 {
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 684c5b7b7832..6179d5bde88e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -661,7 +661,24 @@ EXPORT_SYMBOL_GPL(generic_handle_irq);
 
 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 /**
- * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
+ * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
+ *                             to a domain, usually for a non-root interrupt
+ *                             controller
+ * @domain:	The domain where to perform the lookup
+ * @hwirq:	The HW irq number to convert to a logical one
+ *
+ * Returns:	0 on success, or -EINVAL if conversion has failed
+ *
+ */
+int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
+{
+	return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
+}
+EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
+
+/**
+ * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain,
+ *                       usually for a root interrupt controller
  * @domain:	The domain where to perform the lookup
  * @hwirq:	The HW irq number to convert to a logical one
  * @lookup:	Whether to perform the domain lookup or not
-- 
2.30.2