linux-kernel - Re: [PATCH 1/1] genirq/msi: Dynamic remove/add stroage adapter hits EEH

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Message-ID: <e83622773199665d39db5f724537d9dd@linux.ibm.com>
Date: Tue, 01 Apr 2025 15:14:49 -0500
From: Wen Xiong <wenxiong@...ux.ibm.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org, gjoyce@...ux.ibm.com,
        linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/1] genirq/msi: Dynamic remove/add stroage adapter hits
 EEH

On 2025-03-28 06:27, Thomas Gleixner wrote:

> You are completely missing the point. This is not a problem restricted
> to PCI/MSI interrupts.
> 
Thanks for all suggestions! I will investigate more and check if we can 
fix it in device driver.

Looks several device drivers in kernel use two kernel APIs to set/clean 
IRQ_NO_BALACING status for a given irq.

irq_set_status_flags(irq, IRQ_NO_BALANCING);
irq_clear_status_flags(irq, IRQ_NO_BALANCING);

With these two APIs, device driver can decide if using kernel irq 
balance or setting irq affinity by driver itself?

So we can set/clear IRQ_NO_BALANCING during reset.

Thanks,
Wendy