linux-kernel - [PATCH v5 0/3] irqchip/loongson-eiointc: Refine irq affinity setting during resume

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Message-Id: <20240130082722.2912576-1-maobibo@loongson.cn>
Date: Tue, 30 Jan 2024 16:27:19 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Shtylyov <s.shtylyov@....ru>,
	lvjianmin@...ngson.cn
Subject: [PATCH v5 0/3] irqchip/loongson-eiointc: Refine irq affinity setting during resume

During suspend and resume, other CPUs except CPU0 are hot-unpluged and
IRQs are migrated to CPU0. So it is not necessary to restore irq
affinity for eiointc irq controller.

Also there is small optimization for the interrupt dispatch function
eiointc_irq_dispatch(). For example there are 256 IRQs supported for
eiointc on Loongson Loongson-3A5000 and Loongson-2K2000 system, 128 IRQs
on Loongson-2K0500 platform, eiointc irq handler reads the bitmap and find
pending irqs when irq happens. So there are four times of consecutive
iocsr_read64 operations for all the bits to find all pending irqs. If the
pending bitmap is zero, it means that there is no pending irq for the this
irq bitmap range, we can skip handling to avoid some useless operations
such as clearing hw ISR.

---
 Changes in v5:
  1. Refine changlog

 Changes in v4:
  1. Adjust order of the patch and put the simple patch as first one.
  2. Modify comments in function eiointc_irq_dispatch() suitable for all
hw platforms.

 Changes in v3:
   Split the patch into three small patches

 Changes in v2:
   Modify changelog and comments
---

Bibo Mao (3):
  irqchip/loongson-eiointc: Typo fix in function eiointc_domain_alloc
  irqchip/loongson-eiointc: Skip handling if there is no pending irq
  irqchip/loongson-eiointc: Refine irq affinity setting during resume

 drivers/irqchip/irq-loongson-eiointc.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

base-commit: 41bccc98fb7931d63d03f326a746ac4d429c1dd3
-- 
2.39.3