linux-kernel - [PATCHv3 22/22] staging/android: Update Ion TODO list

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Date:   Mon,  3 Apr 2017 11:58:04 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>, arve@...roid.com
Cc:     Laura Abbott <labbott@...hat.com>, romlem@...gle.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        linux-mm@...ck.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCHv3 22/22] 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: Laura Abbott <labbott@...hat.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)
 
 Please send patches to Greg Kroah-Hartman <greg@...ah.com> and Cc:
 Arve Hjønnevåg <arve@...roid.com> and Riley Andrews <riandrews@...roid.com>
-- 
2.7.4