linux-kernel - [PATCH 0/5] PLX Switch DMA Engine Driver

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Date:   Tue, 22 Oct 2019 15:46:11 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        Vinod Koul <vkoul@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 0/5] PLX Switch DMA Engine Driver

Hi,

The following patches introduce a driver to use the DMA hardware inside
PLX ExpressLane PEX Switches. The DMA devices appear as one or more
PCI virtual functions per channel and can serve similar use cases as
Intel's IOAT driver.

The first two patches in this series fix some bugs that are required to
support cases where the driver is unbound while the DMA engine is in
use. Without these patches the kernel will panic when that happens.

The final three patches implement the driver itself.

This patchset is based off of v5.4-rc4 and a git branch is available
here:

https://github.com/sbates130272/linux-p2pmem/ plx-dma

Thanks,

Logan

--

Logan Gunthorpe (5):
  dmaengine: Store module owner in dma_device struct
  dmaengine: Call module_put() after device_free_chan_resources()
  dmaengine: plx-dma: Introduce PLX DMA engine PCI driver skeleton
  dmaengine: plx-dma: Implement hardware initialization and cleanup
  dmaengine: plx-dma: Implement descriptor submission

 MAINTAINERS               |   5 +
 drivers/dma/Kconfig       |   9 +
 drivers/dma/Makefile      |   1 +
 drivers/dma/dmaengine.c   |   7 +-
 drivers/dma/plx_dma.c     | 658 ++++++++++++++++++++++++++++++++++++++
 include/linux/dmaengine.h |   2 +
 6 files changed, 680 insertions(+), 2 deletions(-)
 create mode 100644 drivers/dma/plx_dma.c

--
2.20.1