Commit fb786a48 authored by Melissa Wen's avatar Melissa Wen
Browse files

drm/vkms: update the current status of todo list 

Update:
- debugging issues on igt testcases
- plane composition features: add primary plane improvements
- suggestions of good tasks to start working on vkms

Drop:
- syzkaller bug report:
  what triggered the warning was replaced by shmem functions at
  https://patchwork.freedesktop.org/patch/394614/
- overlay plane: this feature was added by
  https://patchwork.freedesktop.org/patch/430941/



Signed-off-by: default avatarMelissa Wen <melissa.srw@gmail.com>
Reviewed-by: default avatarRodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210626092655.ghmmt2yux5klrne7@smtp.gmail.com
parent 97c9bfe3

Documentation/gpu/vkms.rst

+26 −12
Original line number Diff line number Diff line
@@ -98,9 +98,17 @@ with VKMS maintainers. 
IGT better support

------------------



- Investigate: (1) test cases on kms_plane that are failing due to timeout on

  capturing CRC; (2) when running kms_flip test cases in sequence, some

  successful individual test cases are failing randomly.

Debugging:



- kms_plane: some test cases are failing due to timeout on capturing CRC;



- kms_flip: when running test cases in sequence, some successful individual

  test cases are failing randomly; when individually, some successful test

  cases display in the log the following error::



  [drm:vkms_prepare_fb [vkms]] ERROR vmap failed: -4



Virtual hardware (vblank-less) mode:



- VKMS already has support for vblanks simulated via hrtimers, which can be

  tested with kms_flip test; in some way, we can say that VKMS already mimics
@@ -116,7 +124,17 @@ Add Plane Features 


There's lots of plane features we could add support for:



- Real overlay planes, not just cursor.

- Multiple overlay planes. [Good to get started]



- Clearing primary plane: clear primary plane before plane composition (at the

  start) for correctness of pixel blend ops. It also guarantees alpha channel

  is cleared in the target buffer for stable crc. [Good to get started]



- ARGB format on primary plane: blend the primary plane into background with

  translucent alpha.



- Support when the primary plane isn't exactly matching the output size: blend

  the primary plane into the black background.



- Full alpha blending on all planes.
@@ -129,13 +147,8 @@ There's lots of plane features we could add support for: 
  cursor api).



For all of these, we also want to review the igt test coverage and make sure

all relevant igt testcases work on vkms.



Prime Buffer Sharing

--------------------



- Syzbot report - WARNING in vkms_gem_free_object:

  https://syzkaller.appspot.com/bug?extid=e7ad70d406e74d8fc9d0

all relevant igt testcases work on vkms. They are good options for internship

project.



Runtime Configuration

---------------------
@@ -162,6 +175,7 @@ Writeback support 
- The writeback and CRC capture operations share the use of composer_enabled

  boolean to ensure vblanks. Probably, when these operations work together,

  composer_enabled needs to refcounting the composer state to proper work.

  [Good to get started]



- Add support for cloned writeback outputs and related test cases using a

  cloned output in the IGT kms_writeback.