drm: implement syncobj and fence for VIRGL/VirtIO driver
Extract protocol-agnostic FenceTimeline from Intel to shared src/drivers/fence.rs — atomic-based fence tracking suitable for Intel, VIRGL, and AMD drivers. Extract protocol-agnostic SyncobjManager from Intel to shared src/drivers/syncobj.rs — syncobj create/destroy/signal/reset/ wait/query and sync_file fd export/import. Wire both into VirtioDriver: - Add FenceTimeline + SyncobjManager fields - Implement all 5 GpuDriver syncobj trait methods (create, destroy, wait, export_fd, import_fd) - Track fence seqnos in virgl_submit_3d (allocate before submit, signal after completion) Intel fence.rs and syncobj.rs converted to thin re-export modules pointing at shared sources — no behavioral change for Intel driver. This gives Mesa VIRGL userspace the standard DRM syncobj API for GPU/compositor synchronization.
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#------------------------------------------------------------------------------
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# $File: python,v 1.47 2024/08/27 18:50:57 christos Exp $
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# python: file(1) magic for python
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#
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# Outlook puts """ too for urgent messages
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# From: David Necas <yeti@physics.muni.cz>
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# often the module starts with a multiline string
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0 string/t """ Python script text executable
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# MAGIC as specified in Python/import.c (1.0 to 3.7)
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# and in Lib/importlib/_bootstrap_external.py (3.5+)
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# two bytes of magic followed by "\r\n" in little endian order
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# magic 3392+ implements PEP 552: Deterministic pycs
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0 name pyc-pep552
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>0 uleshort x (magic: %04d),
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# the flag field determines how .pyc validity is checked
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>4 ulelong&1 0 timestamp-based,
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>>8 uledate x .py timestamp: %s UTC,
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>>12 ulelong x .py size: %d bytes
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>4 ulelong&1 !0 hash-based, check-source flag
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>>4 ulelong&2 0 unset,
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>>4 ulelong&2 !0 set,
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>>8 ulequad x hash: 0x%llx
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# uleshort magic followed by \x0d\0xa
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>4 ulelong <0x4
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# \x0d as part of magic should suffice till Python 3.14 (magic 3600)
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# now look at the magic number to determine the version
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>>>0 uleshort <3400 CPython 3.7
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>>>0 default x
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>>>>>>>>>0 default x CPython 3.14 or newer
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>>>0 use pyc-pep552
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>>>0 use pyc-pep552
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# comments
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#0 search/4096 '''
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>0 regex \^[[:space:]]{0,50}def\ {1,50}[_a-zA-Z]{1,100}
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# https://numpy.org/devdocs/reference/generated/numpy.lib.format.html
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#>8 leshort x \b, header length=%d
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>10 string x \b, description %s
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