linux-kernel - Re: [PATCH V5 0/1] AMD QDMA driver

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Message-ID: <ZRVd4yodNiwhqO9R@matsya>
Date:   Thu, 28 Sep 2023 16:35:07 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Lizhi Hou <lizhi.hou@....com>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        nishad.saraf@....com, sonal.santan@....com, max.zhen@....com
Subject: Re: [PATCH V5 0/1] AMD QDMA driver

On 22-09-23, 10:15, Lizhi Hou wrote:
> Hello,
> 
> The QDMA subsystem is used in conjunction with the PCI Express IP block
> to provide high performance data transfer between host memory and the
> card's DMA subsystem.
> 
>             +-------+       +-------+       +-----------+
>    PCIe     |       |       |       |       |           |
>    Tx/Rx    |       |       |       |  AXI  |           |
>  <=======>  | PCIE  | <===> | QDMA  | <====>| User Logic|
>             |       |       |       |       |           |
>             +-------+       +-------+       +-----------+

This should be in patch description as well

> 
> Comparing to AMD/Xilinx XDMA subsystem,
>     https://lore.kernel.org/lkml/Y+XeKt5yPr1nGGaq@matsya/
> the QDMA subsystem is a queue based, configurable scatter-gather DMA
> implementation which provides thousands of queues, support for multiple
> physical/virtual functions with single-root I/O virtualization (SR-IOV),
> and advanced interrupt support. In this mode the IP provides AXI4-MM and
> AXI4-Stream user interfaces which may be configured on a per-queue basis.
> 
> The QDMA has been used for Xilinx Alveo PCIe devices.
>     https://www.xilinx.com/applications/data-center/v70.html
> 
> This patch series is to provide the platform driver for AMD QDMA subsystem
> to support AXI4-MM DMA transfers. More functions, such as AXI4-Stream
> and SR-IOV, will be supported by future patches.
> 
> The device driver for any FPGA based PCIe device which leverages QDMA can
> call the standard dmaengine APIs to discover and use the QDMA subsystem
> without duplicating the QDMA driver code in its own driver.
> 
> Changes since v4:
> - Convert to use platform driver callback .remove_new()
> 
> Changes since v3:
> - Minor changes in Kconfig description.
> 
> Changes since v2:
> - A minor change from code review comments.
> 
> Changes since v1:
> - Minor changes from code review comments.
> - Fixed kernel robot warning.
> 
> Nishad Saraf (1):
>   dmaengine: amd: qdma: Add AMD QDMA driver
> 
>  MAINTAINERS                            |    9 +
>  drivers/dma/Kconfig                    |   13 +
>  drivers/dma/Makefile                   |    1 +
>  drivers/dma/amd/Makefile               |    8 +
>  drivers/dma/amd/qdma-comm-regs.c       |   66 ++
>  drivers/dma/amd/qdma.c                 | 1187 ++++++++++++++++++++++++
>  drivers/dma/amd/qdma.h                 |  269 ++++++
>  include/linux/platform_data/amd_qdma.h |   36 +
>  8 files changed, 1589 insertions(+)
>  create mode 100644 drivers/dma/amd/Makefile
>  create mode 100644 drivers/dma/amd/qdma-comm-regs.c
>  create mode 100644 drivers/dma/amd/qdma.c
>  create mode 100644 drivers/dma/amd/qdma.h
>  create mode 100644 include/linux/platform_data/amd_qdma.h
> 
> -- 
> 2.34.1

-- 
~Vinod