linux-kernel - Re: [PATCH 1/7] mips: dmi: Fix early remap on MIPS32

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Message-Id: <d6d7e27a-b1a1-48af-be6c-aa9097c48992@app.fastmail.com>
Date:   Thu, 23 Nov 2023 15:07:09 +0000
From:   "Jiaxun Yang" <jiaxun.yang@...goat.com>
To:     "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>
Cc:     "Serge Semin" <fancer.lancer@...il.com>,
        "Arnd Bergmann" <arnd@...db.de>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Mike Rapoport" <rppt@...nel.org>,
        "Matthew Wilcox" <willy@...radead.org>,
        "Tiezhu Yang" <yangtiezhu@...ngson.cn>,
        "Huacai Chen" <chenhuacai@...nel.org>,
        "Yinglu Yang" <yangyinglu@...ngson.cn>,
        "Alexey Malahov" <Alexey.Malahov@...kalelectronics.ru>,
        "Aleksandar Rikalo" <aleksandar.rikalo@...mia.com>,
        "Aleksandar Rikalo" <arikalo@...il.com>,
        "Dragan Mladjenovic" <dragan.mladjenovic@...mia.com>,
        "Chao-ying Fu" <cfu@...ecomp.com>, "Marc Zyngier" <maz@...nel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] mips: dmi: Fix early remap on MIPS32



在2023年11月23日十一月 下午12:29，Thomas Bogendoerfer写道：
> On Thu, Nov 23, 2023 at 12:13:11PM +0000, Jiaxun Yang wrote:
>> > Ok. Thanks for the heads up. I'll fix the patch to be using ioremap()
>> > in v2. ioremap_uc() is just an macro-alias of ioremap() on MIPS.
>> 
>> Perhaps we need to fix ioremap_cache so it can give a KSEG1 address?
>
> KSEG0 ?

Ah yes it's KSEG0.

>
>> AFAIK for Loongson DMI is located at cached memory so using ioremap_uc
>> blindly will cause inconsistency.
>
> why ?

Firmware sometimes does not flush those tables from cache back to memory.
For Loongson systems (as well as most MTI systems) cache is enabled by
firmware.

Thanks.
>
> Thomas.
>
> -- 
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea.                                                [ RFC1925, 2.3 ]

-- 
- Jiaxun