[PATCH v6 0/2] staging: ion: get one device per heap

Benjamin Gaignard benjamin.gaignard at linaro.org
Mon Nov 6 15:59:43 UTC 2017

version 6:
- add an ION bus so heap are show as devices in /sys/bus/ion/
  instead of platform bus.
- split the patch in two: one for include reordering and one
  for per heap device change
- rebased on top of next-2017110 tag

version 5:
- create a configuration flag to keep legacy Ion misc device

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 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.

Using legacy Ion misc device is still by setting ION_LEGACY_DEVICE_API
configuration flag.

Benjamin Gaignard (2):
  staging: ion: reorder include
  staging: ion: create one device entry per heap

 drivers/staging/android/TODO            |  1 -
 drivers/staging/android/ion/Kconfig     |  7 +++
 drivers/staging/android/ion/ion-ioctl.c | 18 +++++++-
 drivers/staging/android/ion/ion.c       | 76 +++++++++++++++++++++++++++------
 drivers/staging/android/ion/ion.h       | 15 ++++++-
 5 files changed, 98 insertions(+), 19 deletions(-)


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