linux-kernel - Re: [PATCH] wifi: ath12k: extend dma mask to 36 bits

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Message-ID: <Z-QaMwB215vTKSTq@hovoldconsulting.com>
Date: Wed, 26 Mar 2025 16:16:03 +0100
From: Johan Hovold <johan@...nel.org>
To: Jeff Johnson <jeff.johnson@....qualcomm.com>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	Jeff Johnson <jjohnson@...nel.org>,
	Stephan Gerhold <stephan.gerhold@...aro.org>,
	ath12k@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: ath12k: extend dma mask to 36 bits

On Wed, Mar 26, 2025 at 08:11:11AM -0700, Jeff Johnson wrote:
> On 3/21/2025 9:23 AM, Johan Hovold wrote:
> > Extend the DMA mask to 36 bits to avoid using bounce buffers on machines
> > without an iommu (under OS control) similar to what was done for ath11k
> > in commit dbd73acb22d8 ("wifi: ath11k: enable 36 bit mask for stream
> > DMA").
> > 
> > This specifically avoids using bounce buffers on Qualcomm Snapdragon X
> > Elite machines like the Lenovo ThinkPad T14s when running at EL1.
> > 
> > Note that the mask could possibly be extended further but unresolved DMA
> > issues with 64 GiB X Elite machines currently prevents that from being
> > tested.
> > 
> > Also note that the driver is limited to 32 bits for coherent
> > allocations and that there is no need to check for errors when setting
> > masks larger than 32 bits.
> > 
> > Tested-on: WCN7850 hw2.0 WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> > 
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> 
> Please make sure to include linux-wireless for all ath.git patches so that
> they are processed by patchwork.kernel.org

Ok, I'll try to remember that, but it seems you need to update
MAINTAINERS to include that list:

	$ scripts/get_maintainer.pl 0001-wifi-ath12k-extend-dma-mask-to-36-bits.patch 
	Jeff Johnson <jjohnson@...nel.org> (supporter:QUALCOMM ATH12K WIRELESS DRIVER)
	ath12k@...ts.infradead.org (open list:QUALCOMM ATH12K WIRELESS DRIVER)
	linux-kernel@...r.kernel.org (open list)

Do you want me to resend?

Johan