[oneandonlydean]

What

Fixes the Linux CI failure of agc_driver_recorder on main and on unrelated PRs (for example run 38622749700 on main):

[gpu] open /dev/udmabuf: Permission denied; shared direct memory is copied instead of imported, ...
AGC graphics: (u) the dma-buf import probe failed at open /dev/udmabuf (-1000072003)

#5211 registered the full recorder run with CTest, so CI now runs it. Its test device turns dmaBufImport off only when /dev/udmabuf does not exist. On the CI runner the device exists but cannot be opened read-write, so dmaBufImport stays on and importWatchTests runs the dma-buf import probe, which fails at open /dev/udmabuf. The emulator handles the same case by copying those ranges (udmabufDevice() in GuestBufferMemory.cpp).

The test device now opens /dev/udmabuf with O_RDWR | O_CLOEXEC, the same flags the imports use, and turns dmaBufImport off when that fails.

Tested

Linux (CachyOS, GCC 16.2.1), Release, BUILD_TESTING=ON, ctest -R "agc_driver_recorder|udmabuf|import" (20 tests). "No access" means open("/dev/udmabuf") is made to fail with EACCES through an LD_PRELOAD shim.

Driver	/dev/udmabuf	Before	After
lavapipe (Mesa 26.2.4, as in CI)	accessible	pass, dma-buf probe runs	pass, dma-buf probe runs
lavapipe	no access	agc_driver_recorder fails with the CI error	20/20 pass, probe skipped
NVIDIA 4090	accessible / no access	pass	20/20 pass

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• AI-assisted: yes

[github-actions]

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 862	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 1368	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 1395	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 1896	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 5021	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 5883	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 5925	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6082	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6155	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6182	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6185	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6186	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6187	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6188	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6192	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6209	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6222	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6225	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6312	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6365	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6373	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6454	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6457	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6475	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6479	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6486	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6490	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6499	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6537	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6635	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6678	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6682	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6683	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6730	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6747	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6763	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6771	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6820	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6868	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6905	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6946	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
PR 6947	core/libs/prx/libSceAgcDriver/tests/Recorder.cpp

[adriadam10]

Closing as obsolete: main already fixes this failure. The recorder test now opens /dev/udmabuf with O_RDWR | O_CLOEXEC and skips the dma-buf import probe when that fails (core/libs/prx/libSceAgcDriver/tests/Recorder.cpp, commit 290be56). The std::filesystem::exists("/dev/udmabuf") check this PR replaces no longer exists there, so the PR now conflicts and has nothing left to change. Feel free to reopen if the CI error still shows up on current main.