| Commit message (Collapse) | Author | Age | Files | Lines |
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Assisted-by: Claude Opus 5.5 (drafting the notes)
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NVN2 gives a texture in a compressible memory pool its GPU address only
after NvRmGpuMappingModify switched the pool's mapping to the texture's
kind. NvRm fails that call unless the GPU characteristics report
NVGPU_GPU_FLAGS_SUPPORT_MAPPING_MODIFY, so such textures kept address 0
and draws into them went nowhere: title 1's cup-opening movie stayed on
its first frame (also its 640x360 and 512x512 passes).
Report the flag and answer the request nn::gpu::sdk then sends, gpu
sub-session 212 (NormalModifyMemoryKind4K), with the wanted kind and a
signalled job slot. The movie now plays on screen and the race follows.
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The decoder service used to complete every submitted frame at once
without decoding it. Each decoder service (gsv 902/906/1002 -> TIPC 1)
now decodes on a thread of its own with FFmpeg (VP9, VP8, H.264;
video_core/host1x/nx2_video_decoder), in software or on the host GPU per
the NVDEC emulation setting.
- 101 takes the codec name ("video/vp9") from its A buffer.
- 109 queues the A buffer's frame; the ready event fires while the queue
has room.
- 311/314 reply a NativeSyncHandle {~syncpoint, 0, value}: the service
allocates a syncpoint and increments it per finished frame, frames
filling output images in register/release order like the client's
ring. 314 waits for the client's release fence before reuse.
- 213 returns the frame's size, pts (TimeSpan, ns) and end of stream.
- gsv 911 creates a decoder image pool (count images in one memory) and
gsv 961 returns the 128-byte CpuUserImageDescriptor that
nn::codec::ReadDecoderOutputImage* copy frames out with; images are
pitch-linear NV12, RGBA or BGRA.
- Each new video command is logged once in full; EDEN_NX2_VDEC_DUMP=<dir>
saves every 120th decoded frame's luma.
Title 1's Mushroom Cup opening (2560x1440 VP9, 1423 frames) now decodes
in real time and the game goes on to the race. The picture on screen
still stays on the first frame: the game memcpys each frame into GPU
memory and the texture cache keeps its first upload (notes 148).
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front paths
Clean A/B in title 1 (3 rounds each): 1.46x the draws a second of one
thread, frames 17% shorter, no crashes, front register copies equal to
the back's in 57,089 checks. EDEN_NX2_SPLIT=0 runs everything on one
thread, =1 keeps macros on the back.
The front's per-write paths no longer check guarded statics
(GpuSplit::Get, Nx2Profile::Enabled, the skip-same switches) and the
ring's method writes are inline. Notes row 145.
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EDEN_NX2_GPU_PROFILE now times engine method calls (the work a split GPU thread's back half
would run) and counts semaphore acquires and those that wait. Title 1: method calls ~343 ms
a second (6.9 million), front-half work (command parsing, macros) ~333 ms, acquires ~2,700 a
second of which ~220 wait. Notes 140 (macro compiler) and 141 (draw setup).
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size)
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ProcessMethodCall and the draw manager behind it act only on executable methods, so
CallMethod stops at the dirty flags for the rest (macro replays write ~2.4 million of
those a second). No change beyond run-to-run noise in two profiled runs; it only removes
work. Notes: row 133 corrected (those courses are bound by the GPU thread, not the host
GPU: 20-40% busy), rows 135-137 (same-value writes, native compute registers, 2D blits).
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courses, deferred inline invalidation)
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parameters, counter polling, worker wake-ups, memo compaction, measurement pitfalls)
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measurements)
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The per-600-present log only had the average frame time, which hides
shader-compile hitches; it now also gives the longest frame and how
many took over 100 ms.
Notes: today's profile of title 1 and what came of it (TSC on AMD,
rejected-shader rethrows, debug hooks, texture churn from VMA slack,
reactive flushing, macro interpreter).
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present serialization, job-system SVCs)
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- Unmapped GPU addresses get a stand-in CPU address fixed by the GPU
address. A fresh one per lookup meant FindImage never found an image
there again: title 1's bloom chain at 0xf0000-0x15b600 was re-created
on every use (~5,400 images per 600 frames), filling VRAM.
- ASTC whose blocks carry no alpha (exact endpoint-mode scan reusing the
decoder's block parsing) is re-compressed to BC1 instead of BC3, half
the size; about 70% of title 1's ASTC qualifies. Copies between BC1
and BC3 hosts are skipped (their guest data is uploaded instead).
EDEN_NX2_ASTC_BC1=0 turns it off.
- Deleting an image cancels every decode still queued for it. An image
re-decoded mid-decode has two; the first to finish cleared IsDecoding,
the second was not cancelled and was uploaded into the next image to
take the slot: garbage textures (the title logo, road patches) and a
staging overrun when that image was smaller.
- Diagnostics: images created and deleted per 600 frames by shape,
collector deletions, async decodes, BC1/BC3 split; collector
thresholds overridable (EDEN_NX2_TC_EXPECTED_MIB/CRITICAL_MIB); GPU
ASTC decode wait timing (EDEN_NX2_ASTC_FLUSH=1 submits without it).
Title 1 attract loop: device memory 4.8-5.1 GB instead of 5.9-6.1 GB, no
decoded textures evicted, ~17 -> 22-23 fps.
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pop-in, frame rate)
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- IMAD by a power of two lowers to SHL imm, the form Eden's jump-table
tracking expects (a title 1 compute program failed "track indirect branch").
- EDEN_NX2_REJECT=<hex addresses>: treat those native programs as rejected,
to bisect a behaviour change without rebuilding.
- A rejected graphics program logs its stage slot, header and slot registers
once (for the task/mesh pipeline setup).
- Notes: rows 87-92, title 1 status.
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- Present flips the image vertically: title 4 renders with a lower-left origin
(negative viewport scale), so its frames are stored bottom-up.
- Lowering: TEX/TEXS FP16 results (bit 79, packed half pairs) - the glyph
shaders unpack them with HADD2.F32; LDG.E with a register address;
SHF.R.U32 low word with a zero high word.
- Debug aids: EDEN_NX2_TRACE_PS / EDEN_NX2_WINDOW_TRACE_SKIP for the window
trace, EDEN_NX2_TEXTURE_DUMP, EDEN_NX2_TRACE_DST for copies; RT trace keyed
by shader pair. NX2_NOTES: blockers 53-57, next steps.
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Newer SDKs open the syncpt session with TIPC 0(u64) and need it echoed, and
query the GPU address space partitions with gpu 201/202 instead of 203. With
these and the larger memory budget, title 1 reaches its main loop and the same
empty-command-buffer stop as title 4.
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nx2:gpu 101 (CreateGpuAccessibleMemory) returns real GpuMemoryHandles; 211
(NormalMapGpuMemory4K) maps handle+offset at the requested GPU address,
including sparse regions, through Nx2GpuMemoryRegistry::MapAt (SMMU ranges are
reused). 102/213/214 complete through their job-slot events. gdbrsp.py waits
for a real thread before driving the stub and gains a write-watch op. Notes
record the current stop: an NVN command buffer with no command memory.
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npdm_info.py dumps META/ACI0 and kernel caps; nso_dis.py disassembles
part of an NSO with clang + llvm-objdump.
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