linux-kernel - Re: [PATCH V8 XDMA 0/2] xilinx XDMA driver

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Date:   Tue, 18 Oct 2022 11:07:16 +0200
From:   Martin Tůma <tumic@...see.org>
To:     Lizhi Hou <lizhi.hou@....com>, vkoul@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        trix@...hat.com
Cc:     max.zhen@....com, sonal.santan@....com, larry.liu@....com,
        brian.xu@....com
Subject: Re: [PATCH V8 XDMA 0/2] xilinx XDMA driver

On 17. 10. 22 18:02, Lizhi Hou wrote:
> Hello,
> 
> This V8 of patch series is to provide the platform driver to support the
> Xilinx XDMA subsystem. The XDMA 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. It also provides up to 16 user
> interrupt wires to user logic that generate interrupts to the host.
> 
>              +-------+       +-------+       +-----------+
>     PCIe     |       |       |       |       |           |
>     Tx/Rx    |       |       |       |  AXI  |           |
>   <=======>  | PCIE  | <===> | XDMA  | <====>| User Logic|
>              |       |       |       |       |           |
>              +-------+       +-------+       +-----------+
> 
> The XDMA has been used for Xilinx Alveo PCIe devices.
> And it is also integrated into Versal ACAP DMA and Bridge Subsystem.
>      https://www.xilinx.com/products/boards-and-kits/alveo.html
>      https://docs.xilinx.com/r/en-US/pg344-pcie-dma-versal/Introduction-to-the-DMA-and-Bridge-Subsystems
> 
> The device driver for any FPGA based PCIe device which leverages XDMA can
> call the standard dmaengine APIs to discover and use the XDMA subsystem
> without duplicating the XDMA driver code in its own driver.
> 
> Changes since v7
> - Use pci device pointer for dma_pool_create().
> 
> Changes since v6:
> - Fixed descriptor filling bug.
> 
> Changes since v5:
> - Modified user logic interrupt APIs to handle user logic IP which does not
>    have its own register to enable/disable interrupt.
> - Clean up code based on review comments.
> 
> Changes since v4:
> - Modified user logic interrupt APIs.
> 
> Changes since v3:
> - Added one patch to support user logic interrupt.
> 
> Changes since v2:
> - Removed tasklet.
> - Fixed regression bug introduced to V2.
> - Test Robot warning.
> 
> Changes since v1:
> - Moved filling hardware descriptor to xdma_prep_device_sg().
> - Changed hardware descriptor enum to "struct xdma_hw_desc".
> - Minor changes from code review comments.
> 
> Lizhi Hou (2):
>    dmaengine: xilinx: xdma: Add xilinx xdma driver
>    dmaengine: xilinx: xdma: Add user logic interrupt support
> 
>   MAINTAINERS                            |   11 +
>   drivers/dma/Kconfig                    |   13 +
>   drivers/dma/xilinx/Makefile            |    1 +
>   drivers/dma/xilinx/xdma-regs.h         |  171 ++++
>   drivers/dma/xilinx/xdma.c              | 1041 ++++++++++++++++++++++++
>   include/linux/dma/amd_xdma.h           |   16 +
>   include/linux/platform_data/amd_xdma.h |   34 +
>   7 files changed, 1287 insertions(+)
>   create mode 100644 drivers/dma/xilinx/xdma-regs.h
>   create mode 100644 drivers/dma/xilinx/xdma.c
>   create mode 100644 include/linux/dma/amd_xdma.h
>   create mode 100644 include/linux/platform_data/amd_xdma.h
> 

Hi,
Just for the record - this version works fine with our HW.

M.