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Message-Id: <20250804081946.1456573-1-maobibo@loongson.cn>
Date: Mon, 4 Aug 2025 16:19:44 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
Jianmin Lv <lvjianmin@...ngson.cn>
Cc: WANG Xuerui <kernel@...0n.name>,
Thomas Gleixner <tglx@...utronix.de>,
loongarch@...ts.linux.dev,
linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org
Subject: [PATCH v4 0/2] irqchip/loongson-eiointc: Add multiple interrupt pin routing support
There are four times EIOINTC_REG_ISR register group access in eiointc irq
handler, in order to get all irq status about 256 interrupt vectors. It
causes four times VM-exits since eiointc register are software emulated,
here multiple interrupt pin routing is introduced and each 64 interrupt
vector is routed to one interrupt pin.
With this method, there will be only once EIOINTC_REG_ISR register
group acces in irq handler, it reduces VM-exits.
There is about 6% improvement with netperf -t UDP_RR on 3C5000 Dual-way
machine, where netserver runs in VM and netperf runs in host.
Socket Size Request Resp. Elapsed Trans Improve
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
Orininal 212992 212992 1 1 10.00 21689.78
With Patch 212992 212992 1 1 10.00 23022.67 +6%
---
v3 ... v4:
1. Update to kernel 6.16
2. Add performance result
v2 ... v3:
1. Update to latest kernel version and solve some confliction.
2. Add strict check about multiple interrupt pin support, only the first
eiointc device support this since intterrupt pin is limited. In order
to support multiple eiointc driver in future if there is in future.
v1 ... v2:
1. Add different route_info handler as eiointc interrupt handler
parameter, so that irq handler can read corresponding ISR
2. Call function set_csr_ecfg() to enable cpu interrupt pin in eiointc
driver inside.
---
Bibo Mao (2):
irqchip/loongson-eiointc: Route interrupt parsed from bios table
irqchip/loongson-eiointc: Add multiple interrupt pin routing support
drivers/irqchip/irq-loongson-eiointc.c | 96 +++++++++++++++++++++++---
1 file changed, 88 insertions(+), 8 deletions(-)
base-commit: 3c4a063b1f8ab71352df1421d9668521acb63cd9
--
2.39.3
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