staging/android: Update ION TODO per LPC discussion

We discussed a bit with the folks on the Cc: list below what to do
with ION. Two big take-aways:

- High-performance drivers (like gpus) always want to play tricks with
  coherency and will lie to the dma api (radeon, nouveau, i915 gpu
  drivers all do so in upstream). What needs to be done here is fill
  gaps in dma-buf so that we can do this without breaking the dma-api
  expections of other clients like v4l. The consesus is that hw won't
  stop needing these tricks anytime soon.

- Placement constraints for shared buffers won't be solved any other
  way than through something platform-specific like ion with
  platform-specific knowledge in userspace in something like gralloc.
  For general-purpose devices where this assumption would be painful
  for userspace (like servers) the consensus is that such devices will
  have proper MMUs where placement constraint handling is fairly
  irrelevant.

Hence it is reasonable to destage ion as-is without changing the
overall design to enable these use-cases and just fixing up a these
few fairly minor things. Since there won't relly be an open-source
userspace for ion (and hence drm maintainers won't take it) the
proposal is to eventually move it to drivers/android/ion.[hc]. Laura
would be ok with being maintainer once this is all done and ion is
destaged.

Note that Thiago is working on exposing the cpu cache flushing for
cpu access from userspace through mmaps so this is alread in progress.
Also adding him to the Cc: list.

v2: Add ION_IOC_IMPORT to the list of ioctl that probably should go.

Cc: Laura Abbott <labbott@redhat.com>
Cc: sumit.semwal@linaro.org
Cc: laurent.pinchart@ideasonboard.com
Cc: ghackmann@google.com
Cc: robdclark@gmail.com
Cc: david.brown@arm.com
Cc: romlem@google.com
Cc: Tiago Vignatti <tiago.vignatti@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Vetter 2015-08-21 14:02:57 -07:00 committed by Greg Kroah-Hartman
parent b786a8ad6a
commit a6ee5ac15d
1 changed files with 20 additions and 0 deletions

View File

@ -5,5 +5,25 @@ TODO:
- add proper arch dependencies as needed
- audit userspace interfaces to make sure they are sane
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.
Please send patches to Greg Kroah-Hartman <greg@kroah.com> and Cc:
Arve Hjønnevåg <arve@android.com> and Riley Andrews <riandrews@android.com>