linux-kernel - Re: iwlwifi: Regression after migrating to 6.6.32

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Message-ID: <d49fcc32-bfa8-41d2-8666-af6256b7b4b4@quicinc.com>
Date: Thu, 13 Jun 2024 15:10:35 +0800
From: Baochen Qiang <quic_bqiang@...cinc.com>
To: Fabio Estevam <festevam@...il.com>,
        Johannes Berg
	<johannes@...solutions.net>
CC: <miriam.rachel.korenblit@...el.com>, <kvalo@...nel.org>,
        Jakub Kicinski
	<kuba@...nel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: iwlwifi: Regression after migrating to 6.6.32



On 6/13/2024 3:15 AM, Fabio Estevam wrote:
> Hi Johannes,
> 
> On Wed, Jun 12, 2024 at 4:10 PM Johannes Berg <johannes@...solutions.net> wrote:
> 
>> Strange. Is there an IOMMU involved on this platform?
> 
> IOMMU isn't available on i.MX8M as far as I know.
If IOMMU not present, likely the buffer is mapped by SWIOTLB. The iova 4215433216, aka 0xFB426800, is 2K aligned, which also supports such guessing. See definition of IO_TLB_SIZE.

> 
> Interestingly, such a warning does not happen with the 5.10 kernel.
> 
> I only noticed it yesterday, after migrating to 6.6.32.
> 
> Thanks
>