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* [igt-dev] [PATCH i-g-t 0/2] test/kms_cursor_crc: tie some loose ends in prepare_crtc
@ 2020-06-25 10:34 Melissa Wen
  2020-06-25 10:35 ` [igt-dev] [PATCH i-g-t 1/2] test/kms_cursor_crc: release old pipe_crc before create a new one Melissa Wen
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Melissa Wen @ 2020-06-25 10:34 UTC (permalink / raw)
  To: igt-dev; +Cc: kernel-usp, twoerner

Using vkms, when running a sequence of subtests from kms_cursor_crc,
several strange timeout failures occurred. For example, running the
alpha-opaque cursor twice, the first run is successful and the second
fails. In addition, if we run the entire test in a call (i.e.: sudo
IGT_FORCE_DRIVER=vkms build/tests/kms_cursor_crc), the first subtest
passes and the rest of the subtests fail - even those that succeed when
run in isolation.

igt_debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
igt_core-INFO: Timed out: Opening crc fd, and poll for first CRC.

During my debugging process, I found two issues that were blocking
execution and the solution is in this patchset:

1 - When a subtest fails, it exits and skips the cleaning step, leaving
the pipe_crc allocated and blocked for the next subtest. The first patch
fixes it by releasing any old pipe_crc before creating a new one.

2 - When the CRC capture process starts, it enters an endless wait; this
seems to be related to the fact that the VKMS simulates vblank events,
generating a time mismatch between vblank and CRC capture. Waiting for
vblank before starting the capture process sets the pace, as shown in
the second patch.

Melissa Wen (2):
  test/kms_cursor_crc: release old pipe_crc before create a new one
  test/kms_cursor_crc: align the start of the CRC capture to a vblank

 tests/kms_cursor_crc.c | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.27.0

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^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2020-07-16 11:40 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-06-25 10:34 [igt-dev] [PATCH i-g-t 0/2] test/kms_cursor_crc: tie some loose ends in prepare_crtc Melissa Wen
2020-06-25 10:35 ` [igt-dev] [PATCH i-g-t 1/2] test/kms_cursor_crc: release old pipe_crc before create a new one Melissa Wen
     [not found]   ` <20200715124706.f6bvf7g7dqbcnyaj@ahiler-desk1.fi.intel.com>
2020-07-16 11:40     ` [igt-dev] [Intel-gfx] " Melissa Wen
2020-06-25 10:36 ` [igt-dev] [PATCH i-g-t 2/2] test/kms_cursor_crc: align the start of the CRC capture to a vblank Melissa Wen
2020-06-25 15:14 ` [igt-dev] ✓ Fi.CI.BAT: success for test/kms_cursor_crc: tie some loose ends in prepare_crtc Patchwork
2020-06-25 16:11 ` [igt-dev] ✗ Fi.CI.IGT: failure " Patchwork

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