linux-kernel - [PATCH 0/5] Support hot-unbind in IOAT

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Message-Id: <20191216190120.21374-1-logang@deltatee.com>
Date:   Mon, 16 Dec 2019 12:01:15 -0700
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>,
        Dave Jiang <dave.jiang@...el.com>, Kit Chow <kchow@...aio.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 0/5] Support hot-unbind in IOAT

Hey,

This patchset creates some common infrastructure which I will use in the
next version of the PLX driver. It adds a reference count to the
dma_device struct which is taken and released every time a channel
is allocated or freed. A call back is used to allow the driver to
free the underlying memory and do any final cleanup.

For a use-case, I've adjusted the ioat driver to properly support
hot-unbind. The driver was already pretty close as it already had
a shutdown state; so it mostly only required freeing the memory
correctly and calling ioat_shutdown at the correct time.

This patchset is based on v5.5-rc2 and a git branch is available here:

https://github.com/sbates130272/linux-p2pmem/ ioat-hot-unbind

Thanks,

Logan

--

Logan Gunthorpe (5):
  dmaengine: Store module owner in dma_device struct
  dmaengine: Call module_put() after device_free_chan_resources()
  dmaengine: Move dma_channel_rebalance() infrastructure up in code
  dmaengine: Add reference counting to dma_device struct
  dmaengine: ioat: Support in-use unbind

 drivers/dma/dmaengine.c   | 352 +++++++++++++++++++++-----------------
 drivers/dma/ioat/init.c   |  38 ++--
 include/linux/dmaengine.h |  10 +-
 3 files changed, 233 insertions(+), 167 deletions(-)

--
2.20.1