linux-kernel - [PATCH v11 6/7] irqchip/loongson-pch-msi: Prepare get_pch_msi

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Message-Id: <20240823104337.25577-1-zhangtianyang@loongson.cn>
Date: Fri, 23 Aug 2024 18:43:36 +0800
From: Tianyang Zhang <zhangtianyang@...ngson.cn>
To: corbet@....net,
	alexs@...nel.org,
	chenhuacai@...nel.org,
	kernel@...0n.name,
	tglx@...utronix.de,
	jiaxun.yang@...goat.com,
	gaoliang@...ngson.cn,
	wangliupu@...ngson.cn,
	lvjianmin@...ngson.cn,
	zhangtianyang@...ngson.cn,
	yijun@...ngson.cn,
	mhocko@...e.com,
	akpm@...ux-foundation.org,
	dianders@...omium.org,
	maobibo@...ngson.cn,
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	zhaotianrui@...ngson.cn,
	nathan@...nel.org,
	yangtiezhu@...ngson.cn,
	zhoubinbin@...ngson.cn
Cc: loongarch@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH v11 6/7] irqchip/loongson-pch-msi: Prepare get_pch_msi_handle() for AVECINTC

On Loongson-3C6000 and higher systems with AVECINTC irqchip, there may
be multiple PCI segments, but only one PCH-MSI irq domain. In this case,
let get_pch_msi_handle() return the first domain handle.

Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
Co-developed-by: Liupu Wang <wangliupu@...ngson.cn>
Signed-off-by: Liupu Wang <wangliupu@...ngson.cn>
Co-developed-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
---
 drivers/irqchip/irq-loongson-pch-msi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-pch-msi.c b/drivers/irqchip/irq-loongson-pch-msi.c
index d43731878800..0dc14550791d 100644
--- a/drivers/irqchip/irq-loongson-pch-msi.c
+++ b/drivers/irqchip/irq-loongson-pch-msi.c
@@ -255,17 +255,17 @@ IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_of_init);
 #ifdef CONFIG_ACPI
 struct fwnode_handle *get_pch_msi_handle(int pci_segment)
 {
-	int i;
+	if (cpu_has_avecint)
+		return pch_msi_handle[0];
 
-	for (i = 0; i < MAX_IO_PICS; i++) {
+	for (int i = 0; i < MAX_IO_PICS; i++) {
 		if (msi_group[i].pci_segment == pci_segment)
 			return pch_msi_handle[i];
 	}
-	return NULL;
+	return pch_msi_handle[0];
 }
 
-int __init pch_msi_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_msi_pic *acpi_pchmsi)
+int __init pch_msi_acpi_init(struct irq_domain *parent, struct acpi_madt_msi_pic *acpi_pchmsi)
 {
 	int ret;
 	struct fwnode_handle *domain_handle;
-- 
2.20.1