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fix(cake_kda_det_kcp): CUDA 12.9 floor for the sm_100a 256-bit stores and walk-form provider compatibility - #8896
Follow-up to #8875, which merged before fixes for two of its automated review comments landed. Both fixes touch the experimental deterministic context-parallel KDA training package. Kernel sources are unchanged, and outputs and gradients are bitwise identical to main.
sm_100a CUDA floor: Kernels using the 256-bit st.global.v8.b32 store need PTX ISA 8.8, but CUDA 12.8 emits 8.7, so ptxas rejects them. The six affected sm_100a entries (four in build.json, two test-only in build.test.json) now declare min_cuda "12.9". A new build test enforces this floor.
Walk-form rules:_walk_form_of now passes arch= only to per-architecture rules (mappings in WALK_FORM_RULES). A custom KernelBackend(programs=...) provider whose walk_form takes only knob no longer raises TypeError.
Summary by CodeRabbit
Bug Fixes
Improved compatibility for walk-form providers using string-based rules; architecture detection is now used only for architecture-specific rules.
Compatibility
Certain sm_100a builds now require CUDA 12.9 or later. Other architecture requirements are unchanged.
…r-architecture rule alone
_walk_form_of passed arch= to the provider's walk_form for every walk program
whenever its jit exposed device_arch, so a provider whose walk_form takes
(program, chains, num_heads, sm_count, *, knob) raised a TypeError on its
first uncached walk. It now passes arch= only when WALK_FORM_RULES[name] is a
mapping (the fused forward walk); the "fit" and "split" rules never take it,
so no shipped form changes. A host test covers an old-signature provider and
the per-architecture rule.
…s need CUDA 12.9
The 256-bit st.global.v8.b32 is PTX ISA 8.8 (CUDA 12.9); nvcc 12.8 emits
PTX ISA 8.7, whose ptxas refuses it. The sm_100a entries of the fused forward
walk (051de8b4, 5e6f3ba0), the chunk output (c811c1b5) and the output
backward (f227dd21) in build.json, and of the full-width tape walks (9cfe05bc,
3808ea4d) in build.test.json, now state min_cuda 12.9; the sm_103a and sm_107a
floors (12.9, 13.4) already cover them. No unit changes. A build test checks
that every entry whose units use a PTX ISA 8.8 instruction states 12.9 or
newer.
The change raises CUDA minimum versions for selected sm_100a builds from 12.8 to 12.9. It also makes walk-form architecture lookup conditional on whether a rule uses per-architecture configuration.
Changes: sm_100a CUDA minimums
Layer / File(s)
Summary
Manifest minimums and PTX validation flashinfer/experimental/cake_kda_det_train_kcp/build.json, flashinfer/experimental/cake_kda_det_train_kcp/build.test.json, tests/experimental/test_cake_kda_det_train_kcp_build.py
Six sm_100a manifest entries now require CUDA 12.9. A test detects specified PTX instructions in manifest sources and checks that matching entries require CUDA 12.9 or later.
_walk_form_of passes architecture lookup only for mapping-based rules. Tests check mapping and string rules, including a provider whose walk_form does not accept an arch parameter.
flashinfer-ai/flashinfer#7436: Adds walk-form selection and the provider interface addressed by the compatibility change.
flashinfer-ai/flashinfer#7097: Adds a KCP program whose deterministic build entry has a CUDA minimum update in this change.
flashinfer-ai/flashinfer#8218: Compares build units across KCP packages, including deterministic manifests updated here.
Suggested labels:op: linear attention
Merge Risk: Minimal · up to 564b8
No actionable merge-blocking issue remains in these compatibility changes. Merge after normal checks; the supplied CI excerpts do not establish test outcomes.
Pre-merge checks: 4 · 1
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The title identifies both main fixes: the CUDA 12.9 floor and walk-form provider compatibility.
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LGTM. One nit: the diff doesn't show Mapping being imported in cake_kcp.py, so make sure it's imported there. Otherwise _walk_form_of raises NameError.
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…entries (#8911)
Follow-up to #8896,
which fixed the sm_100a CUDA floor in the deterministic context-parallel
KDA training package. This PR makes the same fix in the experimental
non-deterministic package, `flashinfer/experimental/cake_kda_train_kcp`.
Only `min_cuda` values change. Kernel sources and the sm_103a / sm_107a
floors (12.9 / 13.4) are unchanged, so outputs and gradients are bitwise
identical to main.
- **sm_100a CUDA floor:** Kernels using the 256-bit `st.global.v8.b32`
store need PTX ISA 8.8. CUDA 12.8 emits 8.7, so ptxas rejects them. Four
sm_100a entries change `min_cuda` from "12.8" to "12.9", which matches
their deterministic twins. Two are in `build.json` (forward output stage
and output backward). The other two are test-only full-width tape walks
in `build.test.json`. No other entry's units use a PTX ISA 8.8
instruction. The build test
`test_an_entry_whose_units_use_ptx_isa_8_8_needs_cuda_12_9` from #8896
now also covers this package. It fails on main's manifests and passes
with this change.
- **Walk-form rules:** This package doesn't need the provider fix from
#8896. All of its `WALK_FORM_RULES` are strings, so `_walk_form_of`
never passes `arch=` to the rule. A provider whose `walk_form` takes
only `knob` already works.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
<!-- coderabbit-ai-generated:v1 -->
## Summary by CodeRabbit
* **Compatibility**
* Two library variants for `sm_100a` now require CUDA 12.9 or newer;
CUDA 12.8 no longer meets their declared minimum.
* The CUDA minimums for `sm_103a` and `sm_107a` remain unchanged. These
requirements apply to the affected library variants in both shipped and
test build manifests.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: Yingyi Huang <averyh@nvidia.com>
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Follow-up to #8875, which merged before fixes for two of its automated review comments landed. Both fixes touch the experimental deterministic context-parallel KDA training package. Kernel sources are unchanged, and outputs and gradients are bitwise identical to main.
st.global.v8.b32store need PTX ISA 8.8, but CUDA 12.8 emits 8.7, so ptxas rejects them. The six affected sm_100a entries (four inbuild.json, two test-only inbuild.test.json) now declaremin_cuda"12.9". A new build test enforces this floor._walk_form_ofnow passesarch=only to per-architecture rules (mappings inWALK_FORM_RULES). A customKernelBackend(programs=...)provider whosewalk_formtakes onlyknobno longer raisesTypeError.Summary by CodeRabbit
sm_100abuilds now require CUDA 12.9 or later. Other architecture requirements are unchanged.