linux-kernel - Re: [PATCH v9 03/11] dmaengine: qcom: bam_dma: implement support for BAM locking

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Message-ID: <d7dvcakczg5rugn2jnpx7kaqsbqhgpicbbzmtxdviha2qdnm6p@n52lxjzomu3v>
Date: Sat, 6 Dec 2025 13:44:51 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: 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>,
        Dmitry Baryshkov <lumag@...nel.org>, 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 v9 03/11] dmaengine: qcom: bam_dma: implement support for
 BAM locking

On Fri, Nov 28, 2025 at 12:44:01PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Use metadata operations in DMA descriptors to allow BAM users to pass
> additional information to the engine. To that end: define a new
> structure - struct bam_desc_metadata - as a medium and define two new
> commands: for locking and unlocking the BAM respectively. Handle the
> locking in the .attach() callback.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  drivers/dma/qcom/bam_dma.c       | 59 +++++++++++++++++++++++++++++++++++++++-
>  include/linux/dma/qcom_bam_dma.h | 12 ++++++++
>  2 files changed, 70 insertions(+), 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry