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authorMelissa Wen <melissa.srw@gmail.com>2021-06-26 12:26:55 +0300
committerMelissa Wen <melissa.srw@gmail.com>2021-07-02 01:04:44 +0300
commitfb786a48ac0dd63e702c05c35426f2e024f5749f (patch)
tree40bb4e6a1ddd84023bb5c1b025d334cda38934fb /Documentation/gpu
parent97c9bfe3f6605d41eb8f1206e6e0f62b31ba15d6 (diff)
downloadlinux-fb786a48ac0dd63e702c05c35426f2e024f5749f.tar.xz
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: Melissa Wen <melissa.srw@gmail.com> Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210626092655.ghmmt2yux5klrne7@smtp.gmail.com
Diffstat (limited to 'Documentation/gpu')
-rw-r--r--Documentation/gpu/vkms.rst38
1 files changed, 26 insertions, 12 deletions
diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index 2c9b376da5ca..941f0e7e5eef 100644
--- a/Documentation/gpu/vkms.rst
+++ b/Documentation/gpu/vkms.rst
@@ -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
---------------------
@@ -153,7 +166,7 @@ module. Use/Test-cases:
the refresh rate.
The currently proposed solution is to expose vkms configuration through
-configfs. All existing module options should be supported through configfs
+configfs. All existing module options should be supported through configfs
too.
Writeback support
@@ -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.