linux-kernel - [PATCH] LoongArch: Increase MAX_IO

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Message-ID: <20250327101520.3328657-1-chenhuacai@loongson.cn>
Date: Thu, 27 Mar 2025 18:15:20 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn,
	Huacai Chen <chenhuacai@...ngson.cn>,
	stable@...r.kernel.org,
	Mingcong Bai <baimingcong@...ngson.cn>
Subject: [PATCH] LoongArch: Increase MAX_IO_PICS up to 8

Begin with Loongson-3C6000, the number of PCI host can be as many as
8 for multi-chip machines, and this number should be the same for I/O
interrupt controllers. To support these machines we also increase the
MAX_IO_PICS up to 8.

Cc: stable@...r.kernel.org
Tested-by: Mingcong Bai <baimingcong@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/include/asm/irq.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index a0ca84da8541..12bd15578c33 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/arch/loongarch/include/asm/irq.h
@@ -53,7 +53,7 @@ void spurious_interrupt(void);
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
 
-#define MAX_IO_PICS 2
+#define MAX_IO_PICS 8
 #define NR_IRQS	(64 + NR_VECTORS * (NR_CPUS + MAX_IO_PICS))
 
 struct acpi_vector_group {
-- 
2.47.1