linux-kernel - [PATCH RFC 0/2] staging: Support Avalon-MM DMA Interface for PCIe

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Message-Id: <cover.1568817357.git.a.gordeev.box@gmail.com>
Date:   Thu, 19 Sep 2019 11:59:11 +0200
From:   Alexander Gordeev <a.gordeev.box@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexander Gordeev <a.gordeev.box@...il.com>,
        Michael Chen <micchen@...era.com>, devel@...verdev.osuosl.org,
        dmaengine@...r.kernel.org
Subject: [PATCH RFC 0/2] staging: Support Avalon-MM DMA Interface for PCIe

The Avalon-MM DMA Interface for PCIe is a design found in hard IPs for
Intel Arria, Cyclone or Stratix FPGAs. It transfers data between on-chip
memory and system memory. This RFC is an attempt to provide a generic API:

	typedef void (*avalon_dma_xfer_callback)(void *dma_async_param);
 
	int avalon_dma_submit_xfer(
		struct avalon_dma *avalon_dma,
		enum dma_data_direction direction,
		dma_addr_t dev_addr, dma_addr_t host_addr,
		unsigned int size,
		avalon_dma_xfer_callback callback,
		void *callback_param);
 
	int avalon_dma_submit_xfer_sg(struct avalon_dma *avalon_dma,
		enum dma_data_direction direction,
		dma_addr_t dev_addr,
		struct sg_table *sg_table,
		avalon_dma_xfer_callback callback,
		void *callback_param);
 
	int avalon_dma_issue_pending(struct avalon_dma *avalon_dma);

Patch 1 introduces "avalon-dma" driver that provides the above-mentioned
generic interface.

Patch 2 adds "avalon-drv" driver using "avalon-dma" to transfer user-
provided data. This driver was used to debug and stress "avalon-dma"
and could be used as a code base for other implementations. Strictly
speaking, it does not need to be part of the kernel tree.
A companion tool using "avalon-drv" to DMA files (not part of this
patchset) is located at git@...hub.com:a-gordeev/avalon-drv-tool.git

The suggested interface is developed with the standard "dmaengine"
in mind and could be reworked to suit it. I would appreciate, however
gathering some feedback on the implemenation first - as the hardware-
specific code would persist. It is also a call for testing - I only
have access to a single Arria 10 device to try on.

This series is against v5.3 and could be found at
git@...hub.com:a-gordeev/linux.git avalon-dma-engine


CC: Michael Chen <micchen@...era.com>
CC: devel@...verdev.osuosl.org
CC: dmaengine@...r.kernel.org

Alexander Gordeev (2):
  staging: avalon-dma: Avalon DMA engine
  staging: avalon-drv: Avalon DMA driver

 drivers/staging/Kconfig                       |   4 +
 drivers/staging/Makefile                      |   2 +
 drivers/staging/avalon-dma/Kconfig            |  45 ++
 drivers/staging/avalon-dma/Makefile           |  11 +
 drivers/staging/avalon-dma/avalon-dma-core.c  | 515 ++++++++++++++
 drivers/staging/avalon-dma/avalon-dma-core.h  |  52 ++
 .../staging/avalon-dma/avalon-dma-interrupt.c | 118 ++++
 .../staging/avalon-dma/avalon-dma-interrupt.h |  13 +
 drivers/staging/avalon-dma/avalon-dma-util.c  | 196 ++++++
 drivers/staging/avalon-dma/avalon-dma-util.h  |  25 +
 drivers/staging/avalon-drv/Kconfig            |  34 +
 drivers/staging/avalon-drv/Makefile           |  14 +
 drivers/staging/avalon-drv/avalon-drv-dev.c   | 193 ++++++
 drivers/staging/avalon-drv/avalon-drv-ioctl.c | 137 ++++
 drivers/staging/avalon-drv/avalon-drv-ioctl.h |  12 +
 drivers/staging/avalon-drv/avalon-drv-mmap.c  |  93 +++
 drivers/staging/avalon-drv/avalon-drv-mmap.h  |  12 +
 .../staging/avalon-drv/avalon-drv-sg-buf.c    | 132 ++++
 .../staging/avalon-drv/avalon-drv-sg-buf.h    |  26 +
 drivers/staging/avalon-drv/avalon-drv-util.c  |  54 ++
 drivers/staging/avalon-drv/avalon-drv-util.h  |  12 +
 drivers/staging/avalon-drv/avalon-drv-xfer.c  | 655 ++++++++++++++++++
 drivers/staging/avalon-drv/avalon-drv-xfer.h  |  24 +
 drivers/staging/avalon-drv/avalon-drv.h       |  22 +
 include/linux/avalon-dma-hw.h                 |  72 ++
 include/linux/avalon-dma.h                    |  68 ++
 include/uapi/linux/avalon-drv-ioctl.h         |  30 +
 27 files changed, 2571 insertions(+)
 create mode 100644 drivers/staging/avalon-dma/Kconfig
 create mode 100644 drivers/staging/avalon-dma/Makefile
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-core.c
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-core.h
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-interrupt.c
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-interrupt.h
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-util.c
 create mode 100644 drivers/staging/avalon-dma/avalon-dma-util.h
 create mode 100644 drivers/staging/avalon-drv/Kconfig
 create mode 100644 drivers/staging/avalon-drv/Makefile
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-dev.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-ioctl.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-ioctl.h
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-mmap.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-mmap.h
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-sg-buf.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-sg-buf.h
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-util.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-util.h
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-xfer.c
 create mode 100644 drivers/staging/avalon-drv/avalon-drv-xfer.h
 create mode 100644 drivers/staging/avalon-drv/avalon-drv.h
 create mode 100644 include/linux/avalon-dma-hw.h
 create mode 100644 include/linux/avalon-dma.h
 create mode 100644 include/uapi/linux/avalon-drv-ioctl.h

-- 
2.22.0