linux-kernel - Re: [PATCH v8 01/11] dmaengine: Add DMA_PREP_LOCK/DMA_PREP

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Message-ID: <1f9aa097-27c2-49c0-b01c-cd0377143bb4@infradead.org>
Date: Thu, 6 Nov 2025 22:19:58 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Bartosz Golaszewski <brgl@...ev.pl>, Vinod Koul <vkoul@...nel.org>,
 Jonathan Corbet <corbet@....net>, Thara Gopinath <thara.gopinath@...il.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>,
 Udit Tiwari <quic_utiwari@...cinc.com>,
 Daniel Perez-Zoghbi <dperezzo@...cinc.com>,
 Md Sadre Alam <mdalam@....qualcomm.com>
Cc: dmaengine@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-crypto@...r.kernel.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v8 01/11] dmaengine: Add DMA_PREP_LOCK/DMA_PREP_UNLOCK
 flags

On 11/6/25 3:33 AM, Bartosz Golaszewski wrote:
>  Documentation/driver-api/dmaengine/provider.rst | 9 +++++++++
>  include/linux/dmaengine.h                       | 6 ++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst
> index 1594598b331782e4dddcf992159c724111db9cf3..6428211405472dd1147e363f5786acc91d95ed43 100644
> --- a/Documentation/driver-api/dmaengine/provider.rst
> +++ b/Documentation/driver-api/dmaengine/provider.rst
> @@ -630,6 +630,15 @@ DMA_CTRL_REUSE
>    - This flag is only supported if the channel reports the DMA_LOAD_EOT
>      capability.
>  
> +- DMA_PREP_LOCK
> +
> +  - If set, the DMA controller will be locked for the duration of the current
> +    transaction.
> +
> +- DMA_PREP_UNLOCK
> +
> +  - If set, DMA will release he controller lock.

                                the

> +
>  General Design Notes

-- 
~Randy