linux-kernel - Re: [PATCH 0/1] Add support for metadata in bam

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Message-ID: <CAFvbNjZr-WdDAKQ8f-P1beiOkZzfinpr5ua+wVoKaagtE_EcNQ@mail.gmail.com>
Date:   Sun, 19 Sep 2021 21:22:29 +0530
From:   Sirsireesh <sireeshkodali1@...il.com>
To:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        dmaengine@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH 0/1] Add support for metadata in bam_dma

Hi,

Sorry, I accidentally sent this patch twice. Please ignore the second one
(i.e. the one I'm replying to now)

lkml link to original: https://lkml.org/lkml/2021/9/19/126

Sorry for the inconvenience
Sireesh



On Sun, Sep 19, 2021 at 8:03 PM Sireesh Kodali <sireeshkodali1@...il.com> wrote:
>
> IPA v2.x uses BAM to send and receive IP packets, to and from the AP.
> However, unlike its predecessor BAM-DMUX, it doesn't send information
> about the packet length. To find the length of the packet, one must
> instead read the bam_desc metadata. This patch adds support for sending
> the size metadata over the dmaengine metadata api. Currently only the
> dma size is stored in the metadata. Only client-side metadata is
> supported for now, because host-side metadata doesn't make sense for
> IPA, where more than one DMA descriptors could be waiting to be acked
> and processed.
>
> Sireesh Kodali (1):
>   dmaengine: qcom: bam_dma: Add support for metadata
>
>  drivers/dma/qcom/bam_dma.c | 74 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
>
> --
> 2.33.0
>