linux-kernel - [PATCH v2 00/12] iio: buffer-dma: write() and new DMABUF based API

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Message-Id: <20220207125933.81634-1-paul@crapouillou.net>
Date:   Mon,  7 Feb 2022 12:59:21 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Michael Hennerich <Michael.Hennerich@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Christian König <christian.koenig@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v2 00/12] iio: buffer-dma: write() and new DMABUF based API

Hi Jonathan,

This is the V2 of my patchset that introduces a new userspace interface
based on DMABUF objects to complement the fileio API, and adds write()
support to the existing fileio API.

Changes since v1:

- the patches that were merged in v1 have been (obviously) dropped from
  this patchset;
- the patch that was setting the write-combine cache setting has been
  dropped as well, as it was simply not useful.
- [01/12]: 
    * Only remove the outgoing queue, and keep the incoming queue, as we
      want the buffer to start streaming data as soon as it is enabled.
    * Remove IIO_BLOCK_STATE_DEQUEUED, since it is now functionally the
      same as IIO_BLOCK_STATE_DONE.
- [02/12]:
    * Fix block->state not being reset in
      iio_dma_buffer_request_update() for output buffers.
    * Only update block->bytes_used once and add a comment about why we
      update it.
    * Add a comment about why we're setting a different state for output
      buffers in iio_dma_buffer_request_update()
    * Remove useless cast to bool (!!) in iio_dma_buffer_io()
- [05/12]:
    Only allow the new IOCTLs on the buffer FD created with
    IIO_BUFFER_GET_FD_IOCTL().
- [12/12]:
    * Explicitly state that the new interface is optional and is
      not implemented by all drivers.
    * The IOCTLs can now only be called on the buffer FD returned by
      IIO_BUFFER_GET_FD_IOCTL.
    * Move the page up a bit in the index since it is core stuff and not
      driver-specific.

The patches not listed here have not been modified since v1.

Cheers,
-Paul

Alexandru Ardelean (1):
  iio: buffer-dma: split iio_dma_buffer_fileio_free() function

Paul Cercueil (11):
  iio: buffer-dma: Get rid of outgoing queue
  iio: buffer-dma: Enable buffer write support
  iio: buffer-dmaengine: Support specifying buffer direction
  iio: buffer-dmaengine: Enable write support
  iio: core: Add new DMABUF interface infrastructure
  iio: buffer-dma: Use DMABUFs instead of custom solution
  iio: buffer-dma: Implement new DMABUF based userspace API
  iio: buffer-dmaengine: Support new DMABUF based userspace API
  iio: core: Add support for cyclic buffers
  iio: buffer-dmaengine: Add support for cyclic buffers
  Documentation: iio: Document high-speed DMABUF based API

 Documentation/driver-api/dma-buf.rst          |   2 +
 Documentation/iio/dmabuf_api.rst              |  94 +++
 Documentation/iio/index.rst                   |   2 +
 drivers/iio/adc/adi-axi-adc.c                 |   3 +-
 drivers/iio/buffer/industrialio-buffer-dma.c  | 610 ++++++++++++++----
 .../buffer/industrialio-buffer-dmaengine.c    |  42 +-
 drivers/iio/industrialio-buffer.c             |  60 ++
 include/linux/iio/buffer-dma.h                |  38 +-
 include/linux/iio/buffer-dmaengine.h          |   5 +-
 include/linux/iio/buffer_impl.h               |   8 +
 include/uapi/linux/iio/buffer.h               |  30 +
 11 files changed, 749 insertions(+), 145 deletions(-)
 create mode 100644 Documentation/iio/dmabuf_api.rst

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2.34.1