linux-kernel - [PATCH v2 0/3] iio: core,buffer-dma: add mmap support

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Message-ID: <20210212101143.18993-1-alexandru.ardelean@analog.com>
Date:   Fri, 12 Feb 2021 12:11:40 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
CC:     <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <jic23@...nel.org>, <nuno.sa@...log.com>,
        <dragos.bogdan@...log.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 0/3] iio: core,buffer-dma: add mmap support

Changelog v1 -> v2:
* https://lore.kernel.org/linux-iio/20210211123353.78963-1-alexandru.ardelean@analog.com/T/#t
* removed IIO_BUFFER_BLOCK_FLAG_CYCLIC flag; will be added in a later
  patch
* removed extra line in tools/iio/iio_generic_buffer.c
* patch 'iio: core: Add mmap interface infrastructure'
  added docstrings for new hooks (alloc_blocks, mmap, etc)

This is basically Lars' work adapted from branch:
  https://github.com/larsclausen/linux/commits/iio-high-speed-5.10
[hopefully i got the stuff correctly from that branch]

What is different, is that this one is adapted on top of the multibuffer
support (currently at v5) discussed here:
  https://lore.kernel.org/linux-iio/20210211122452.78106-1-alexandru.ardelean@analog.com/T/#t

Also, adapted an example for high-speed/mmap support in
'tools/iio/iio_generic_buffer.c'

The example is adapted from libiio:
  https://github.com/analogdevicesinc/libiio/blob/master/local.c#L51
but will all the ioctl()s organized after the one that are reserved
(hopefully) for IIO

Tested that mmap() works.
Moved (artifically) valid buffer0 as buffer2 and the operation still
works.

Alexandru Ardelean (1):
  tools: iio: add example for high-speed buffer support

Lars-Peter Clausen (2):
  iio: core: Add mmap interface infrastructure
  iio: buffer-dma: Add mmap support

 drivers/iio/buffer/industrialio-buffer-dma.c  | 314 ++++++++++++++++--
 .../buffer/industrialio-buffer-dmaengine.c    |  22 +-
 drivers/iio/industrialio-buffer.c             | 158 +++++++++
 include/linux/iio/buffer-dma.h                |  25 +-
 include/linux/iio/buffer_impl.h               |  23 ++
 include/uapi/linux/iio/buffer.h               |  26 ++
 tools/iio/iio_generic_buffer.c                | 183 +++++++++-
 7 files changed, 704 insertions(+), 47 deletions(-)

-- 
2.17.1