lkml.org 
[lkml]   [2016]   [Jun]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Linaro-mm-sig] [RFC][PATCH 0/6] ion: improved ABI
From
Date
The idea is good, define the heap ids in header file is inconvenient.

But if we query the heaps information from user-space.

It need to maintain this ids and name userspace one by one. The code may
be complicated in different module user-space.

In android, the gralloc and other lib will all use ion to alloc memory.

This will make it more difficult to maintain user-space code.


But beyond this, The new alloc2 with not-handle flag is good.
And the pull out of ioctl interface is also a good cleanup.

On 2016/6/7 2:23, Laura Abbott wrote:
>
> The ABI for Ion's ioctl interface are a pain to work with. The heap IDs
> are a 32-bit non-discoverable namespace that form part of the ABI. There's
> no way to determine what ABI version is in use which leads to problems
> if the ABI changes or needs to be updated.
>
> This series is a first approach to give a better ABI for Ion. This includes:
>
> - Following the advice in botching-up-ioctls.txt
> - Ioctl for ABI version
> - Dynamic assignment of heap ids
> - queryable heap ids
> - Runtime mapping of heap ids, including fallbacks. This avoids the need to
> encode the fallbacks as an ABI.
>
> I'm most interested in feedback if this ABI is actually an improvement and
> usable. The heap id map/query interface seems error prone but I didn't have
> a cleaner solution. There aren't any kernel APIs for the new features as the
> focus was on a userspace API but I anticipate that following easily once
> the userspace API is established.
>
>
> Thanks,
> Laura
>
> P.S. Not to turn this into a bike shedding session but if you have suggestions
> for a name for this framework other than Ion I would be interested to hear
> them. Too many other things are already named Ion.
>
> Laura Abbott (6):
> staging: android: ion: return error value for ion_device_add_heap
> staging: android: ion: Switch to using an idr to manage heaps
> staging: android: ion: Drop heap type masks
> staging: android: ion: Pull out ion ioctls to a separate file
> staging: android: ion: Add an ioctl for ABI checking
> staging: android: ion: Introduce new ioctls for dynamic heaps
>
> drivers/staging/android/ion/Makefile | 3 +-
> drivers/staging/android/ion/ion-ioctl.c | 243 ++++++++++++++++++
> drivers/staging/android/ion/ion.c | 438 ++++++++++++++++----------------
> drivers/staging/android/ion/ion_priv.h | 109 +++++++-
> drivers/staging/android/uapi/ion.h | 164 +++++++++++-
> 5 files changed, 728 insertions(+), 229 deletions(-)
> create mode 100644 drivers/staging/android/ion/ion-ioctl.c
>

\
 
 \ /
  Last update: 2016-06-07 09:21    [W:0.174 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site