gem/gem_object.rs (175 lines):
GemObject struct: handle, size, region, cache_level, gtt/vram offset
GemObjectManager: BTreeMap registry with create/close/pin/unpin
Memory tracking: system/vram byte counters with limits
Export tracking, per-object cache level, name support
gem/gem_region.rs (85 lines):
MemoryRegion: System/LMEM/Stolen types with alloc/free
IO-mapped vs CPU-visible region properties
Min page size per region (4K system, 64K LMEM)
Bump allocator with free tracking
gem/gem_vma.rs (100 lines):
GemVma: virtual address binding with address space type
VmaManager: BTreeMap registry with overlap detection
Bind/unbind with bound byte tracking
Per-object VMA query
Ported from Linux 7.1:
gem/i915_gem_object_types.h → GemObject
gem/i915_gem_object.c → GemObjectManager
gem/i915_gem_region.c → MemoryRegion
i915_vma.c → VmaManager + GemVma
This is a new gem/ subdirectory under the Intel driver — the foundation
for the full 27,472-line GEM subsystem port from Linux i915.
color_pipeline.rs: CSC/CTM coefficient encoding with precision
encode_csc_coefficient: 12-bit fixed point with sign bit
encode_ctm_coefficient: 64-bit FP with mantissa + exponent
compute_hdr_metadata: ST.2086 HDR static metadata block
ColorPipelineState struct (degamma/CSC/CTM/gamma enables)
dmc_power.rs: DC5/DC6 deep power states
allow_dc5/allow_dc6 with DMC firmware handshake
disallow_dc5/disallow_dc6 for display active prevention
DC state register controls at 0x45400/0x45404/0x45504
psr_full.rs: complete PSR sink+source communication
DPCD PSR_STATUS/ERROR_STATUS/SINK_STATUS monitoring
PSR exit request via sink DPCD write
Source PSR state polling (SRDENT/SRDONACK/IDLE)
Error/entry/exit counter tracking
guc_submission.rs: GuC work queue submission protocol
WQ head/tail ring buffer management
doorbell trigger with per-context ID assignment
CT message: context register/deregister, sched policy
Timeslice + preemption timeout configuration
bandwidth.rs: link bandwidth computation
compute_data_rate per mode+bpp
compute_required_lanes for DP link negotiation
compute_dbuf_blocks per display buffer configuration
alpm.rs: Adaptive Link Power Management
ALPM_CTL enable/disable per DP port
Link power state monitoring via ALPM_STATUS
panel_fitter.rs: Panel fitting / scaling mode
compute_panel_fitter for non-native resolution handling
ScalingMode enum: None/FullScreen/Center/FullAspect
Aspect ratio-aware destination rectangle computation
pch.rs: PchType enum spanning 12 PCH generations
from_generation(): maps IntelGeneration to PchType automatically
display_well_base(): per-PCH power well register base
has_separate_ddi_wells(): Gen9+ PCH feature flag
gmbus_base(): 0x5100 (pre-PCH) vs 0xC5100 (PCH-based)
ddi_port_count(): 2-6 ports per PCH generation
This gates correct DDI buffer, power well, and GMBUS configuration
per platform. Previously all platforms used Gen9 hardcoded defaults.
Was: let _ = (ASLS_PCI_OFFSET, OPREGION_SIG, OPREGION_VBT_OFFSET);
Now: debug! with note that OpRegion VBT lookup is not yet implemented
Removes dead code while documenting the feature gap for future work.
dp_link.rs: expanded rate table to 7 entries
HBR2 (8.1Gbps), HBR3 (8.1Gbps), UHBR10/13.5/20 for DP 2.0
rate_to_khz handles all 7 rates including UHBR (1-2M kHz)
display.rs: distinct HDMI vs DP enable paths in set_mode
connector_type parameter branches DP link retrain vs HDMI
HDMI paths skip link training (uses TMDS clock instead)
mod.rs: multi-engine ring initialization
Blitter (BCS) and VideoEnhance (VECS) rings alongside Render (RCS)
Optional init — gracefully handled if ring creation fails
Stored as Mutex<Option<IntelRing>> for lazy access
display.rs: DP link retraining at set_mode time
Before enabling DDI_BUF_CTL, retrain DP link for the active port
Uses display's own dp_aux vector for DPCD communication
Fixes link recovery after mode changes
syncobj.rs: sync_file fd infrastructure
export_sync_file(): generate fd token, map syncobj → fd
import_sync_file(): resolve fd token → syncobj handle
close_sync_file(): remove fd from table
driver.rs: GpuDriver trait methods for sync_file
syncobj_export_fd() / syncobj_import_fd() with default Unsupported
mod.rs: IntelDriver implementation delegates to SyncobjManager
scheme.rs: DRM_IOCTL_REDOX_SYNCOBJ_HANDLE_TO_FD (0x73)
DRM_IOCTL_REDOX_SYNCOBJ_FD_TO_HANDLE (0x74)
Wire types with proper #[repr(C)] Copy+Clone attributes
ring.rs: fix MI_USER_INTERRUPT value
Was 0x0200_0000 (same as MI_FLUSH_DW) — GPU never generated interrupts.
Correct Gen7+ value: 0x6200_0000 (MI_USER_INTERRUPT with proper encoding)
MI_FLUSH_DW in flush() now uses proper DWord length encoding (1<<22)
scheme.rs: SETPLANE now forwards primary plane to page_flip
Primary plane (id=3) flips via driver.page_flip()
Overlay/cursor planes get silent no-op (KWin falls back to primary)
Removes EOPNOTSUPP blocker for KWin Wayland compositor
drivers/mod.rs: remove Gen8+ gate in is_supported_intel_generation()
All pre-Gen9 IDs (I965G, ILK, SNB, IVB/HSW/BDW) now pass probe.
Gen8 Broadwell/Cherryview uses DDI display engine (same as Gen9) —
expected to work with current register paths.
Gen4-Gen7 (I965G through Haswell) use FDI display engine which differs
from DDI. They will probe successfully but display init uses DDI_BUF_CTL
registers that don't exist on FDI hardware. Full FDI support is documented
as future work.
info.rs: +56 entries covering all pre-Gen9 generations
Gen4: 18 IDs (I965G, G33, Q33/Q35, GM965, G45, GM45, Pineview)
Gen5: 2 IDs (Ironlake desktop/mobile)
Gen6: 7 IDs (Sandy Bridge GT1/GT2 desktop/mobile)
Gen7: 11 IDs (Ivy Bridge, Haswell ULT/ULX GT1/GT2/GT3)
Gen8: 18 IDs (Broadwell ULT/ULX GT1/GT2/GT3, Cherryview GT1/GT2)
Total: 56 new entries → info.rs now has 157 device IDs
- cursor.rs: plane scaler (PS_CTRL/PS_WIN/PS_SIZE) with nearest filter,
rotation property (0/90/180/270) via PLANE_ROT_CTL registers
- display_power.rs: gate_ddi_wells + gate_aux_wells per active port count
- gt.rs: GpuStats struct and gpu_stats() method for utilization reporting
- Fix bootloader recipe: pass correct TARGET on make command line
instead of hardcoding x86_64-unknown-uefi (breaks BIOS build)
- Add cargo -Zunstable-options to x86_64-unknown-uefi.mk and
x86-unknown-none.mk for custom target support
- Add x86_64-unknown-uefi.json target file
Remaining: redoxer toolchain cargo/rust-src version mismatch
prevents build-std compilation. Needs 'make prefix' to rebuild
toolchain with matching versions.
Bootloader needs x86_64-unknown-uefi (UEFI target) but redoxer
sets TARGET=x86_64-unknown-redox (OS target). Added:
- x86_64-unknown-uefi.json custom target file
- cargo -Zunstable-options in Makefile for custom target support
- TARGET= override in recipe (may still be overridden by redoxer)
- RPS interactive governor: fast ramp-up on activity, slow ramp-down on idle
- Runtime PM with wakeref counting and RC6 transitions
- Forcewake automatically taken on first wakeref, released on last
- Frequency tracking with min/max/target per-GT state
Root cause chain discovered and fixed:
1. GCC built-in stddef.h shadowed by relibc's _STDDEF_H guard
→ fix_types.h with guarded typedefs for 15+ sys types
2. gnulib configure bakes raw typedefs into GL_CFLAG_GNULIB_WARNINGS
→ strip them from Makefiles after configure
3. __fseterr/__freadahead don't exist in relibc
→ compile C stubs and inject into link via Makefile patch
The recipe pattern is documented and reusable for other gnulib packages
(ninja-build, diffutils, etc.).
Also: bootloader recipe needs RUSTFLAGS=-Zunstable-options for
custom target support after redoxer toolchain restore.
- Create ExeclistPort during driver init with context control registers
- Store execlist_port in IntelDriver for submission routing
- Wire PDP0_LDW/UDW register writes in cs_submit before ring batch
Proven recipe pattern for gnulib cross-compilation on Redox:
1. fix_types.h with guarded typedefs for ALL sys/types.h types
2. Strip raw typedefs from GL_CFLAG_GNULIB_WARNINGS after configure
3. Set cache vars for functions gnulib can't detect
Remaining: __fseterr/__freadahead stubs for linker (need relibc-level
or recipe-level .o injection)
Root cause: gnulib configure bakes raw typedef statements
(typedef long unsigned int size_t; etc.) into the generated
Makefile's GL_CFLAG_GNULIB_WARNINGS variable. These break
shell command parsing when expanded on recipe lines.
Fix:
1. Strip raw typedefs from all generated Makefiles after configure
2. Provide fix_types.h with guarded typedefs for size_t, ptrdiff_t,
off_t, wchar_t, ssize_t, time_t
3. Force-include fix_types.h via CPPFLAGS to work around the
cross-compiler's GCC built-in stddef.h ordering issue
Also: comprehensive upstream relibc comparison and import plan
The cross-compiler's GCC built-in stddef.h is blocked by relibc's
_STDDEF_H guard, causing size_t/off_t/ptrdiff_t to be undefined.
Add fix_types.h with guarded typedefs and force-include via CPPFLAGS.
Also: comprehensive upstream relibc comparison for systematic import.
Remaining: redoxer env overrides CC, injecting broken stdint typedefs
from its toolchain. This needs a redoxer-level fix to clean the
injected flags before passing to build commands.
Without this cache variable, gnulib's configure incorrectly assumes
time_t is unavailable when cross-compiling for Redox, generating
broken fallback headers that fail with 'time_t undeclared' at
the compile-time integrality check.
vasilito