Test cases for fbdev

This patchset adds read and write tests for fbdev. It compares the content of the framebuffer and reference buffer. A number of the special cases near the EOF are also tested.

Depending on the implementation (sys, cfb), fbdev read/write changes its semantics. Together with a kernel patches [1] these test cases intend to provide a reference.

v6:
* remove unaligned I/O from fast-feedback,testlist (Petri)
* actually use igt_assert() in nullptr test (Petri)
v5:
* test mmap() with igt_assert() (Daniel, Chris)
v4:
* declare variables as volatile where necessary (Petri)
* replace igt_require() with igt_assert() in several places (Petri)
* clarify several error messages (Petri)
* update CI
v3:
* put igt_describe() before the block it describes (Petri)
v2:
* move tests into subtest groups
* do setup in igt_fixtures (Daniel, Chris, Petri)
* add additional tests for unaligned access and NULL-pointer buffers (Daniel)

[1] https://patchwork.freedesktop.org/series/80038/

Thomas Zimmermann (8):
tests/fbdev: Move existing tests into separate subgroups tests/fbdev: Map framebuffer in igt_fixture tests/fbdev: Add tests for read operations on framebuffer tests/fbdev: Add tests for unaligned reads on framebuffer memory tests/fbdev: Add tests for write operations on framebuffer tests/fbdev: Add tests for unaligned writes on framebuffer memory tests/fbdev: Add tests for accessing framebuffer near EOF tests/fbdev: Add tests for read/writing with NULL-pointer buffers

 tests/fbdev.c                         | 223 ++++++++++++++++++++++++--
 tests/intel-ci/fast-feedback.testlist |   6 +-
 2 files changed, 212 insertions(+), 17 deletions(-)

--
2.29.2

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