linux-kernel - [PATCH v12 01/25] irqchip/gic-v3: Make gic_irq_domain

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Date: Sat, 27 Jan 2024 21:47:29 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Frank Rowand <frowand.list@...il.com>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>,
	Björn Töpel <bjorn@...nel.org>,
	Atish Patra <atishp@...shpatra.org>,
	Andrew Jones <ajones@...tanamicro.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Anup Patel <anup@...infault.org>,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v12 01/25] irqchip/gic-v3: Make gic_irq_domain_select() robust for zero parameter count

From: Thomas Gleixner <tglx@...utronix.de>

Currently the irqdomain select callback is only invoked when the parameter
count of the fwspec arguments is not zero. That makes sense because then
the match is on the firmware node and eventually on the bus_token, which is
already handled in the core code.

The upcoming support for per device MSI domains requires to do real bus
token specific checks in the MSI parent domains with a zero parameter
count.

Make the gic-v3 select() callback handle that case.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-gic-v3.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 98b0329b7154..35b9362d178f 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1702,9 +1702,13 @@ static int gic_irq_domain_select(struct irq_domain *d,
 	irq_hw_number_t hwirq;
 
 	/* Not for us */
-        if (fwspec->fwnode != d->fwnode)
+	if (fwspec->fwnode != d->fwnode)
 		return 0;
 
+	/* Handle pure domain searches */
+	if (!fwspec->param_count)
+		return d->bus_token == bus_token;
+
 	/* If this is not DT, then we have a single domain */
 	if (!is_of_node(fwspec->fwnode))
 		return 1;
-- 
2.34.1