Commit e44adf05 authored by Laura Abbott's avatar Laura Abbott Committed by Greg Kroah-Hartman
Browse files

staging/android: Update Ion TODO list 



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: default avatarLaura Abbott <labbott@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 804ca94a

drivers/staging/android/TODO

+4 −17
Original line number Diff line number Diff line
@@ -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)



Please send patches to Greg Kroah-Hartman <greg@kroah.com> and Cc:

Arve Hjønnevåg <arve@android.com> and Riley Andrews <riandrews@android.com>