linux-kernel - [PATCH RFC 00/13] dmaengine: Smart Data Accelerator Interface (SDXI) basic support

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Message-Id: <20250905-sdxi-base-v1-0-d0341a1292ba@amd.com>
Date: Fri, 05 Sep 2025 13:48:23 -0500
From: Nathan Lynch via B4 Relay <devnull+nathan.lynch.amd.com@...nel.org>
To: Vinod Koul <vkoul@...nel.org>
Cc: Wei Huang <wei.huang2@....com>, 
 Mario Limonciello <mario.limonciello@....com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [PATCH RFC 00/13] dmaengine: Smart Data Accelerator Interface
 (SDXI) basic support

The Smart Data Accelerator Interface (SDXI) is a vendor-neutral
architecture for memory-to-memory data movement offload designed for
kernel bypass and virtualization.

General information on SDXI may be found at:
https://www.snia.org/sdxi

This submission adds a driver with basic support for PCIe-hosted SDXI 1.0
implementations and includes a DMA engine provider.

It is very much a work in progress. Among other issues, the DMA
provider code only supports single-threaded polled mode, and context
management should use better data structures.

While we're addressing those shortcomings, we'd appreciate any
feedback on:

* Where the code should live. SDXI entails a fair amount of code for
  context and descriptor management, and we expect to eventually add a
  character device ABI for user space access. Should all of this go in
  drivers/dma/sdxi?

* Whether the DMA engine provider should use virt-dma/vchan. SDXI
  submission queues can be almost arbitrarily large, and I'm not sure
  putting a software queue in front of that makes sense.

Planned future SDXI work (out of scope for this series):

* Character device for user space access. We are evaluating the uacce
  framework for this.

* Support for operation types to be added in future SDXI revisions.

* Greater configurability for control structures, e.g. descriptor ring
  size.

The latest released version of the SDXI specification is 1.0:
https://www.snia.org/sites/default/files/technical-work/sdxi/release/SNIA-SDXI-Specification-v1.0a.pdf

Draft versions of future SDXI specifications in development may be found at:
https://www.snia.org/tech_activities/publicreview#sdxi

---
Nathan Lynch (13):
      PCI: Add SNIA SDXI accelerator sub-class
      dmaengine: sdxi: Add control structure definitions
      dmaengine: sdxi: Add descriptor encoding and unit tests
      dmaengine: sdxi: Add MMIO register definitions
      dmaengine: sdxi: Add software data structures
      dmaengine: sdxi: Add error reporting support
      dmaengine: sdxi: Import descriptor enqueue code from spec
      dmaengine: sdxi: Context creation/removal, descriptor submission
      dmaengine: sdxi: Add core device management code
      dmaengine: sdxi: Add PCI driver support
      dmaengine: sdxi: Add DMA engine provider
      dmaengine: sdxi: Add Kconfig and Makefile
      MAINTAINERS: Add entry for SDXI driver

 MAINTAINERS                         |   7 +
 drivers/dma/Kconfig                 |   2 +
 drivers/dma/Makefile                |   1 +
 drivers/dma/sdxi/.kunitconfig       |   4 +
 drivers/dma/sdxi/Kconfig            |  23 ++
 drivers/dma/sdxi/Makefile           |  17 ++
 drivers/dma/sdxi/context.c          | 547 ++++++++++++++++++++++++++++++++++++
 drivers/dma/sdxi/context.h          |  28 ++
 drivers/dma/sdxi/descriptor.c       | 197 +++++++++++++
 drivers/dma/sdxi/descriptor.h       | 107 +++++++
 drivers/dma/sdxi/descriptor_kunit.c | 181 ++++++++++++
 drivers/dma/sdxi/device.c           | 401 ++++++++++++++++++++++++++
 drivers/dma/sdxi/dma.c              | 409 +++++++++++++++++++++++++++
 drivers/dma/sdxi/dma.h              |  12 +
 drivers/dma/sdxi/enqueue.c          | 136 +++++++++
 drivers/dma/sdxi/enqueue.h          |  16 ++
 drivers/dma/sdxi/error.c            | 340 ++++++++++++++++++++++
 drivers/dma/sdxi/error.h            |  16 ++
 drivers/dma/sdxi/hw.h               | 249 ++++++++++++++++
 drivers/dma/sdxi/mmio.h             |  92 ++++++
 drivers/dma/sdxi/pci.c              | 216 ++++++++++++++
 drivers/dma/sdxi/sdxi.h             | 206 ++++++++++++++
 include/linux/pci_ids.h             |   1 +
 23 files changed, 3208 insertions(+)
---
base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9
change-id: 20250813-sdxi-base-73d7c9fdce57

Best regards,
-- 
Nathan Lynch <nathan.lynch@....com>