[Linaro-mm-sig] [PATCHv4 12/12] staging/android: Update Ion TODO list

Daniel Vetter daniel at ffwll.ch
Wed Apr 19 01:36:55 PDT 2017


On Tue, Apr 18, 2017 at 11:27:14AM -0700, Laura Abbott wrote:
> Most of the items have been taken care of by a clean up series. Remove
> the completed items and add a few new ones.
> 
> Signed-off-by: Laura Abbott <labbott at redhat.com>
> ---
>  drivers/staging/android/TODO | 21 ++++-----------------
>  1 file changed, 4 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/staging/android/TODO b/drivers/staging/android/TODO
> index 8f3ac37..5f14247 100644
> --- a/drivers/staging/android/TODO
> +++ b/drivers/staging/android/TODO
> @@ -7,23 +7,10 @@ TODO:
>  
>  
>  ion/
> - - Remove ION_IOC_SYNC: Flushing for devices should be purely a kernel internal
> -   interface on top of dma-buf. flush_for_device needs to be added to dma-buf
> -   first.
> - - Remove ION_IOC_CUSTOM: Atm used for cache flushing for cpu access in some
> -   vendor trees. Should be replaced with an ioctl on the dma-buf to expose the
> -   begin/end_cpu_access hooks to userspace.
> - - Clarify the tricks ion plays with explicitly managing coherency behind the
> -   dma api's back (this is absolutely needed for high-perf gpu drivers): Add an
> -   explicit coherency management mode to flush_for_device to be used by drivers
> -   which want to manage caches themselves and which indicates whether cpu caches
> -   need flushing.
> - - With those removed there's probably no use for ION_IOC_IMPORT anymore either
> -   since ion would just be the central allocator for shared buffers.
> - - Add dt-binding to expose cma regions as ion heaps, with the rule that any
> -   such cma regions must already be used by some device for dma. I.e. ion only
> -   exposes existing cma regions and doesn't reserve unecessarily memory when
> -   booting a system which doesn't use ion.
> + - Add dt-bindings for remaining heaps (chunk and carveout heaps). This would
> +   involve putting appropriate bindings in a memory node for Ion to find.
> + - Split /dev/ion up into multiple nodes (e.g. /dev/ion/heap0)
> + - Better test framework (integration with VGEM was suggested)

Found another one: Integrate the ion kernel-doc into
Documenation/gpu/ion.rst and link it up within Documenation/gpu/index.rst.
There's a lot of api and overview stuff already around, would be great to
make this more accessible.

But I wouldn't put this as a de-staging blocker, just an idea.

On the series: Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>

No full review since a bunch of stuff I'm not too familiar with, but I
like where this is going.
-Daniel

>  
>  Please send patches to Greg Kroah-Hartman <greg at kroah.com> and Cc:
>  Arve Hjønnevåg <arve at android.com> and Riley Andrews <riandrews at android.com>
> -- 
> 2.7.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch



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