linux-kernel - [PATCH] irqchip/loongarch-avec:Add multi-nodes topology support

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Message-Id: <20241207033146.20938-1-zhangtianyang@loongson.cn>
Date: Sat,  7 Dec 2024 11:31:46 +0800
From: Tianyang Zhang <zhangtianyang@...ngson.cn>
To: chenhuacai@...nel.org,
	kernel@...0n.name,
	tglx@...utronix.de
Cc: loongarch@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Tianyang Zhang <zhangtianyang@...ngson.cn>
Subject: [PATCH] irqchip/loongarch-avec:Add multi-nodes topology support

This patch enables the advanced interrupt controller function under
multiple-node of 3C600. The topology of the advanced interrupt controller
is consistent with NUMA node. We check the enable status of the node where
each CPU is located once when it goes online, which may cause some
additional operations, but it can ensure that the advanced interrupt
controller can still be used in situations where some CPUs cannot start

Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
---
 drivers/irqchip/irq-loongarch-avec.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-loongarch-avec.c b/drivers/irqchip/irq-loongarch-avec.c
index 0f6e465dd309..9e30198fa7e4 100644
--- a/drivers/irqchip/irq-loongarch-avec.c
+++ b/drivers/irqchip/irq-loongarch-avec.c
@@ -56,6 +56,18 @@ struct avecintc_data {
 	unsigned int		moving;
 };
 
+static inline void avecintc_enable(void)
+{
+	u64 value;
+
+	if (!loongarch_avec.domain)
+		return;
+
+	value = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
+	value |= IOCSR_MISC_FUNC_AVEC_EN;
+	iocsr_write64(value, LOONGARCH_IOCSR_MISC_FUNC);
+}
+
 static inline void avecintc_ack_irq(struct irq_data *d)
 {
 }
@@ -127,6 +139,8 @@ static int avecintc_cpu_online(unsigned int cpu)
 
 	guard(raw_spinlock)(&loongarch_avec.lock);
 
+	avecintc_enable();
+
 	irq_matrix_online(loongarch_avec.vector_matrix);
 
 	pending_list_init(cpu);
@@ -339,7 +353,6 @@ static int __init irq_matrix_init(void)
 static int __init avecintc_init(struct irq_domain *parent)
 {
 	int ret, parent_irq;
-	unsigned long value;
 
 	raw_spin_lock_init(&loongarch_avec.lock);
 
@@ -378,14 +391,13 @@ static int __init avecintc_init(struct irq_domain *parent)
 				  "irqchip/loongarch/avecintc:starting",
 				  avecintc_cpu_online, avecintc_cpu_offline);
 #endif
-	value = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
-	value |= IOCSR_MISC_FUNC_AVEC_EN;
-	iocsr_write64(value, LOONGARCH_IOCSR_MISC_FUNC);
+	avecintc_enable();
 
 	return ret;
 
 out_remove_domain:
 	irq_domain_remove(loongarch_avec.domain);
+	loongarch_avec.domain = NULL;
 out_free_handle:
 	irq_domain_free_fwnode(loongarch_avec.fwnode);
 out:
-- 
2.20.1