linux-kernel - [PATCH v4 0/2] staging: ion: get one device per heap

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Date:   Tue, 26 Sep 2017 14:07:03 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     labbott@...hat.com, sumit.semwal@...aro.org,
        gregkh@...uxfoundation.org, arve@...roid.com,
        riandrews@...roid.com, broonie@...nel.org, dan.carpenter@...cle.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-api@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>
Subject: [PATCH v4 0/2] staging: ion: get one device per heap

version 4:
- add a configuration flag to switch between legacy Ion misc device
  and one device per heap version.
  This change has been suggested after Laura talks at XDC 2017.

version 3:
- change ion_device_add_heap prototype to return a possible error.

version 2:
- simplify ioctl check like propose by Dan
- make sure that we don't register more than ION_DEV_MAX heaps.

Until now all ion heaps are addressing using the same device "/dev/ion".
This way of working doesn't allow to give access rights (for example with
SElinux rules) per heap.
This series propose to have (under configuartion flag) one device "/dev/ionX"
per heap. Query heaps informations will be possible on each device node but
allocation request will only be possible if heap_mask_id match with device minor number.

That enable  thsi new flag change Ion ABI because:
- device name change
- allocation must be done on the correct device/heap.
- device major number will not be the same and that could impact init scripts.

Benjamin Gaignard (2):
  staging: ion: simplify ioctl args checking function
  staging: ion: create one device entry per heap

 drivers/staging/android/TODO            |  1 -
 drivers/staging/android/ion/Kconfig     |  8 ++++++++
 drivers/staging/android/ion/ion-ioctl.c | 27 +++++++++++++++++++--------
 drivers/staging/android/ion/ion.c       | 29 +++++++++++++++++++++++++++--
 drivers/staging/android/ion/ion.h       | 18 +++++++++++++++++-
 5 files changed, 71 insertions(+), 12 deletions(-)

-- 
2.7.4