[0/1] Add support for metadata in bam_dma

Message

Sireesh Kodali Sept. 19, 2021, 2:42 p.m. UTC

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(+)