linux-kernel - Re: ath12k: REO status on PPC does not work

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <d6f0b64f-1764-41cd-a7c5-fb34d034ace2@oss.qualcomm.com>
Date: Tue, 19 Aug 2025 14:38:38 +0800
From: Baochen Qiang <baochen.qiang@....qualcomm.com>
To: Alexander Wilhelm <alexander.wilhelm@...termo.com>,
        Jeff Johnson <jjohnson@...nel.org>
Cc: ath12k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: ath12k: REO status on PPC does not work



On 8/15/2025 4:13 PM, Alexander Wilhelm wrote:
> Hello devs,
> 
> I'm currently working on getting the 'ath12k' driver running on a big endian
> PowerPC platform and have encountered the following issue.
> 
> In the function 'ath12k_dp_rx_process_reo_status', the REO status is determined
> by inspecting memory that the hardware has previously written via DMA.
> Specifically, during the call to 'ath12k_hal_srng_access_begin', the driver
> reads the value of 'hp_addr' for the destination ring (in my case, always with
> ID 21). On the big endian platform, this value is consistently 0, which prevents
> the REO status from being updated.

This does not seem an endian issue to me, because either of them we should get a value
other than 0.

> 
> Interestingly, DMA read/write accesses work fine for other rings, just not for
> this one. What makes the REO status ring so special? I couldn’t find anything in
> the initialization routine that would explain the difference.
> 
> Could anyone give me a hint on what I should be looking for?
> 
> 
What hardware are you using? WCN7850 or QCN9274?

> Best regards
> Alexander Wilhelm
>