linux-kernel - Re: [PATCH v16 6/9] irqchip: Add RISC-V advanced PLIC driver for direct-mode

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Message-ID: <87qztmgj32.ffs@tglx>
Date: Tue, 25 Nov 2025 17:42:09 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: niliqiang <ni_liqiang@....com>, maz@...nel.org
Cc: ajones@...tanamicro.com, anup@...infault.org, apatel@...tanamicro.com,
 atishp@...shpatra.org, bjorn@...nel.org, conor+dt@...nel.org,
 dai.hualiang@....com.cn, deng.weixian@....com.cn,
 devicetree@...r.kernel.org, frowand.list@...il.com, guo.chang2@....com.cn,
 hu.yuye@....com.cn, krzysztof.kozlowski+dt@...aro.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, liu.qingtao2@....com.cn,
 liu.wenhong35@....com.cn, ni.liqiang@....com.cn, ni_liqiang@....com,
 palmer@...belt.com, paul.walmsley@...ive.com, robh+dt@...nel.org,
 saravanak@...gle.com, sunilvl@...tanamicro.com, wu.jiabao@....com.cn
Subject: Re: [PATCH v16 6/9] irqchip: Add RISC-V advanced PLIC driver for
 direct-mode

On Wed, Nov 26 2025 at 00:07, niliqiang wrote:
> We've noticed that PCIe enumeration order tends to vary across system reboots (for example: first
> boot showed PC08->PC06->PC10->PC07->PC11->PC09, while second boot showed
> PC09->PC06->PC08->PC11->PC07->PC10), even though the ACPI firmware consistently reports the root
> bridge sequence as PC06->PC07->PC08->PC09->PC10->PC11.
>
> In our testing, we found that adjusting the registration priority of the aplic driver seems to help
> ensure the interrupt controller initializes before PCI enumeration, leading to more consistent
> device ordering.

You're repeating yourself over and over, but you're missing the point.

The ACPI table does not provide a sequence, it provides a collection and
it's nowhere written in stone that this collection has to be processed
in order.

If you want a sequence then put dependencies into the table and be done
with it, no?

Thanks,

        tglx