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

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Date:   Sun, 19 Sep 2021 20:03:10 +0530
From:   Sireesh Kodali <sireeshkodali1@...il.com>
To:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Sireesh Kodali <sireeshkodali1@...il.com>
Subject: [PATCH 0/1] Add support for metadata in bam_dma

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