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Re: [PATCH v3 2/2] staging: ion: create one device entry per heap

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On 09/20/2017 01:45 AM, Benjamin Gaignard wrote:
> Instead a getting one common device "/dev/ion" for
> all the heaps this patch allow to create one device
> entry ("/dev/ionX") per heap.
> Getting an entry per heap could allow to set security rules
> per heap and global ones for all heaps.
> 
> Allocation requests will be only allowed if the mask_id
> match with device minor.
> Query request could be done on any of the devices.
> Deivce node major will also change and that may impact init scripts.
> 

We should start Cc linux-api for future changes since we're going
to have more than just /dev/ion.

Thinking about this some more, I think we need to allow backwards
compatibility. It's just not feasible to keep throwing workarounds
into userspace if we can avoid it. I'd propose keeping the old /dev/ion
misc interface available under a Kconfig and then creating the new
split heaps in parallel.

On a somewhat related note, there was some interest in possibly
having a sysfs interface for Ion long term. I don't think this
needs to happen right now but I'd like whatever we do to not
make adding that harder.

Thanks,
Laura

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[PATCH v3 0/2] staging: ion: get one device per heap Benjamin Gaignard <benjamin.gaignard@linaro.org> - 2017-09-20 10:50 +0200
  [PATCH v3 2/2] staging: ion: create one device entry per heap Benjamin Gaignard <benjamin.gaignard@linaro.org> - 2017-09-20 10:50 +0200
    Re: [PATCH v3 2/2] staging: ion: create one device entry per heap Laura Abbott <labbott@redhat.com> - 2017-09-25 20:30 +0200
      Re: [PATCH v3 2/2] staging: ion: create one device entry per heap Daniel Vetter <daniel@ffwll.ch> - 2017-09-26 07:20 +0200
        Re: [PATCH v3 2/2] staging: ion: create one device entry per heap Greg KH <gregkh@linuxfoundation.org> - 2017-09-26 09:00 +0200

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