linux-kernel - Re: [RFC V3 PATCH 0/8] Xilinx DMA enhancements and optimization

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Date:   Tue, 20 Sep 2022 16:57:29 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lars@...afoo.de, adrianml@...mnos.upm.es,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        michal.simek@....com, radhey.shyam.pandey@....com,
        anirudha.sarangi@....com, harini.katakam@....com, git@...inx.com,
        git@....com
Subject: Re: [RFC V3 PATCH 0/8] Xilinx DMA enhancements and optimization

On 20-09-22, 11:21, Sarath Babu Naidu Gaddam wrote:
> Some background about the patch series: Xilinx Axi Ethernet device driver
> (xilinx_axienet_main.c) currently has axi-dma code inside it. The goal is
> to refactor axiethernet driver and use existing AXI DMA driver using
> DMAEngine API.
> 
> This patchset does feature addition and optimization to support axidma
> integration with axiethernet network driver. Once axidma version is
> accepted mcdma specific changes will be added in followup version.

why is this tagged RFC? Is it not ready for merge?

> 
> Changes for V2:
> - Use metadata API[1] for passing metadata from dma to netdev client.
> - Read irq-delay from DT.
> - Remove desc_callback_valid check.
> - Addressed RFC v1 comments[2].
> - Minor code refactoring.
> 
> Changes for V3:
> - Add device_config support for passing any dma client data.
> - Address RFC v2 comments.
>     - remove hardcoding for axidma_tx_segment.
>     - Below review comment is in pipeline. We are facing a race issue when
>       addressing it. we will fix it in the next version.
>       "chan->idle = true; in xilinx_dma_irq_handler() needs to be gated on
>        the active_list being empty".
> 
> Comments, suggestions are very welcome
> 
> Radhey Shyam Pandey (7):
>   dt-bindings: dmaengine: xilinx_dma: Add xlnx,axistream-connected
>     property
>   dt-bindings: dmaengine: xilinx_dma: Add xlnx,irq-delay property
>   dmaengine: xilinx_dma: Pass AXI4-Stream control words to dma client
>   dmaengine: xilinx_dma: Increase AXI DMA transaction segment count
>   dmaengine: xilinx_dma: Freeup active list based on descriptor
>     completion bit
>   dmaengine: xilinx_dma: Use tasklet_hi_schedule for timing critical
>     usecase
>   dmaengine: xilinx_dma: Program interrupt delay timeout
> 
> Sarath Babu Naidu Gaddam (1):
>   dmaengine: xilinx_dma: Add device_config support
> 
>  .../bindings/dma/xilinx/xilinx_dma.txt        |   4 +
>  drivers/dma/xilinx/xilinx_dma.c               | 107 ++++++++++++++++--
>  include/linux/dma/xilinx_dma.h                |  16 +++
>  3 files changed, 115 insertions(+), 12 deletions(-)
> 
> -- 
> 2.25.1

-- 
~Vinod