Messages in this thread | | | Date | Fri, 29 Sep 2023 08:24:47 -0700 | Subject | Re: [PATCH V5 0/1] AMD QDMA driver | From | Lizhi Hou <> |
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On 9/28/23 04:05, Vinod Koul wrote: > 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
Sure. I will add this.
Thanks,
Lizhi
> >> 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
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