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List: linux-api
Subject: [PATCH v4 0/2] staging: ion: get one device per heap
From: Benjamin Gaignard <benjamin.gaignard () linaro ! org>
Date: 2017-09-26 12:07:03
Message-ID: 1506427625-19202-1-git-send-email-benjamin.gaignard () linaro ! org
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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
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