[None][chore] Backport PrimTS vendor refresh to release/1.3 by yuxianq · Pull Request #20301 · NVIDIA/TensorRT-LLM

yuxianq · 2026-10-14T15:27:54Z

Dev Engineer Review

The PrimTS vendor snapshot and compatibility patch were refreshed. The context planner now receives separate K- and V-cache dtypes, and the block-sparse proxy contract uses K/V block means over present tokens. These changes align the wrapper API, vendor code, and sparse reference behavior.

The refresh retains the release branch’s bound plan-cache behavior and omits unrelated vendor and SOL backend changes. No dependency version changes or new FMHA enablement are reported. Release-branch GPU execution and normal CI remain pending, so Blackwell numerical, end-to-end, and performance behavior is not yet verified.

QA Engineer Review

Three test files changed. They cover context-wrapper planner arguments, decode and MLA CUDA-graph references, and block-sparse proxy routing. No changed test was found in the test-db/ CI lists or qa/ manual-QA lists. The author reports passing 72 hermetic vendor-source tests and offline checks; release-branch GPU and normal CI results are pending.

Coverage verdict: needs follow-up. Run the listed release validation on supported hardware, including test_prims_ts_fmha.py, test_prims_ts_attention_backend.py, and sparse/test_prims_ts_block_sparse.py.

Per-File QA Perspective

3rdparty/vendor_patches/flashinfer-prims-ts.patch — Vendor changes switch selected APIs and imports and remove trace-dispatch templates from wrappers. Verify supported dispatch paths and imports on the release branch.
3rdparty/vendor_sources.lock.yaml — The PrimTS source pin and patch/source digests changed. Verify vendor integrity against the refreshed snapshot.
tensorrt_llm/_torch/attention/backends/fmha/prims_ts.py — The context plan call now passes separate K- and V-cache dtypes. Verify planning with matching and different cache dtypes.
tensorrt_llm/_torch/attention/backends/sparse/params.py — The block-sparse input contract defines K/V summaries as means over present tokens, including a partial final block. Verify callers provide summaries in this format.
tests/unittest/_torch/attention/sparse/test_prims_ts_block_sparse.py — Updates proxy-route reference scaling and replay V summaries to block means. This test was not found in the integration CI or manual-QA lists.
tests/unittest/_torch/attention/test_prims_ts_attention_backend.py — Updates decode and MLA CUDA-graph reference APIs and workspace sizing, and checks separate context dtypes. This test was not found in the integration CI or manual-QA lists.
tests/unittest/_torch/attention/test_prims_ts_fmha.py — Uses an autospecced context-wrapper mock and checks separate K/V dtype arguments. This test was not found in the integration CI or manual-QA lists.

Description

Backport #20155 to release/1.3.

Original squash commit: fca08032f752cecde2fdb99d1538940b4d23fc7a.
Release base: 248825ed123474bd95302f716b95a2ea1db1cca1.
Backport commit: 0b3d0cfe01c1f6a3e9f8ca62cfae106165e425c1, using git cherry-pick -x -s.

The backport imports the same audited PrimTS source snapshot and persistent compatibility patch as the merged main PR:

Item	Before	After
Canonical branch in `yuxianq/flashinfer`	`trtllm-prims-ts-dev`	`trtllm-prims-ts-dev-20261012`
Source commit	`6e0d64e79f2a87eeb539e2f40ea12d009679a8f5`	`ae312f7cc1723b06fda5168105ade0f328ee47d8`

It also carries the separate context K/V dtype planner arguments, updated dense attention wrapper/graph tests, and the generic block-sparse proxy summary contract/reference updates. The source audit and compatibility rationale are documented in #20155. FlashInfer 0.6.18 and CUTLASS DSL 4.8.0.dev0 requirements remain unchanged. No new FMHA enablement, dependency updates, or vendor-bot changes are included.

Release-specific conflict resolutions

Four files conflicted:

3rdparty/vendor_sources.lock.yaml: kept the refreshed PrimTS pin and digests while preserving the release branch's vendor membership. Did not introduce main's unrelated openengine-proto entry; sana-sol-attn is unchanged.
tensorrt_llm/_torch/visual_gen/attention_backend/sparse/sol/kernels.py.
tests/unittest/_torch/visual_gen/sparse_attention/sol/test_sol_parity.py.
tests/unittest/_torch/visual_gen/sparse_attention/sol/test_sol_predictor.py.

The last three are absent from release/1.3, which does not contain that SOL predictor/backend integration. Kept them absent rather than introduce isolated implementation/tests without the feature. Generic PrimTS block-sparse K/V-mean contract and test updates are retained, including the release branch's existing explicitly bound plan-cache behavior.

Post-cherry-pick range-diff confirms the only patch differences are those three intentional omissions, lock-file surrounding context, and cherry-pick/sign-off metadata. All 51 applicable changed files are preserved, with no extra files introduced by conflict resolution. The complete PrimTS vendor tree, compatibility patch, dense FMHA adapter, and dense attention test files match #20155 byte-for-byte.

The upstream canonical branches and existing publishing bot are untouched. This is a code-changing release backport, not a lock-only promotion; it needs normal CI.

Test Coverage

Passed on this backport:

All 72 hermetic tests/unittest/others/test_vendor_sources.py tests.
Offline integrity verification of both release vendor entries.
Source-backed PrimTS verification against the immutable source commit in a local source repository; destination exactly matches the source plus compatibility patch.
Assertions that the complete PrimTS lock entry matches [None][chore] Refresh PrimTS vendor source onto FlashInfer main #20155, vendor membership matches the release baseline, and the unrelated vendor entry is unchanged.
Python syntax compilation of the vendored PrimTS package, affected adapters, and attention tests.
Applicable pre-commit hooks and git diff --check.
Post-cherry-pick file-set and range-diff audits.

Pending: release-branch GPU execution and normal CI. The local GPU is A40, while these PrimTS kernels require SM100/SM103; the host Python dependencies are also older than the release requirements. No new Blackwell numerical, end-to-end model, or performance result is claimed for this backport. The original main PR's B200 results are historical evidence, not a substitute for release validation.

Relevant release validation includes test_prims_ts_fmha.py, test_prims_ts_attention_backend.py (Qwen/DeepSeek, eager and CUDA graph), and sparse/test_prims_ts_block_sparse.py.

PR Checklist

Please review the following before submitting your PR:

PR description explains the backport and each release-specific conflict resolution.
Followed TRT-LLM coding guidelines and DCO sign-off requirements.
Relevant tests are preserved; local results and outstanding GPU/CI coverage are identified above.
No public API, dependency pin, model architecture, or ownership changes.
Required release reviews and CI remain pending; keep this PR in draft.
Please check this after reviewing the above items as appropriate for this PR.

GitHub Bot Help

To see a list of available CI bot commands, please comment /bot help.

…IA#20155) Signed-off-by: Yuxian Qiu <142763828+yuxianq@users.noreply.github.com> (cherry picked from commit fca0803) Signed-off-by: Yuxian Qiu <142763828+yuxianq@users.noreply.github.com>

yuxianq · 2026-10-14T15:28:08Z

/bot run

yuxianq · 2026-10-14T15:32:48Z

/bot run --disable-fail-fast

tensorrt-cicd · 2026-10-14T15:35:36Z

PR_Github #77851 [ run ] triggered by Bot. Commit: 0b3d0cf Link to invocation

tensorrt-cicd · 2026-10-14T15:39:50Z

PR_Github #77854 [ run ] triggered by Bot. Commit: 0b3d0cf Link to invocation

coderabbitai · 2026-10-14T15:40:23Z

Walkthrough

The pull request updates the vendored FlashInfer PrimTS source and its API usage. It also passes separate K- and V-cache dtypes, clarifies block-sparse summary semantics, and updates decode and attention tests.

Changes

PrimTS attention integration

Layer / File(s)	Summary
Vendor source and API alignment `3rdparty/vendor_patches/flashinfer-prims-ts.patch`, `3rdparty/vendor_sources.lock.yaml`	The vendor patch updates API decorators and import paths across block-sparse, context, decode, MLA decode, and sparse metadata modules. The source lock records an updated branch, commit, and digests.
Separate context cache dtypes `tensorrt_llm/_torch/attention/backends/fmha/prims_ts.py`, `tests/unittest/_torch/attention/test_prims_ts_attention_backend.py`, `tests/unittest/_torch/attention/test_prims_ts_fmha.py`	Context wrapper planning and tests pass separate key and value cache dtypes. The wrapper test uses an autospecced mock.
Block-sparse proxy summaries `tensorrt_llm/_torch/attention/backends/sparse/params.py`, `tests/unittest/_torch/attention/sparse/test_prims_ts_block_sparse.py`	The documentation describes K/V summaries as block means over present tokens, including a partial final block. The proxy reference and replay test use block means.
Decode graph replay references `tests/unittest/_torch/attention/test_prims_ts_attention_backend.py`	Decode and MLA graph tests use public paged-cache reference APIs and workspaces sized to the computed requirement. They remove workspace/query overlap rejection checks. Shared-workspace decode references also use the public API.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to 0b3d0

The partial-block proxy test gap is bounded but worth fixing to protect attention correctness. No other concrete merge-blocking issue is established.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 5 files. (2 skipped: 2 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The description clearly explains the PrimTS backport, release-specific conflict resolutions, test coverage, pending validation, and checklist status. It includes the required sections and relevant rel…
Title check		The title is concise, specific, and accurately identifies the PrimTS vendor refresh backport to release/1.3.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 5 files. (2 skipped: 2 unsupported.)

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Inline comments:
Review comments at
@tests/unittest/_torch/attention/sparse/test_prims_ts_block_sparse.py:
- Line 116: Update _proxy_reference to weight each proxy summary by the actual
number of tokens it represents in both the numerator and denominator, rather
than assuming every block contains 64 tokens. Add a test case with a partial
final proxy block and verify the reference result uses that block’s token count.

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📥 Commits

Reviewing files that changed from the base of the PR and between 248825e and 0b3d0cf.

⛔ Files ignored due to path filters: 44

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📒 Files selected for processing: 7

3rdparty/vendor_patches/flashinfer-prims-ts.patch
3rdparty/vendor_sources.lock.yaml
tensorrt_llm/_torch/attention/backends/fmha/prims_ts.py
tensorrt_llm/_torch/attention/backends/sparse/params.py
tests/unittest/_torch/attention/sparse/test_prims_ts_block_sparse.py
tests/unittest/_torch/attention/test_prims_ts_attention_backend.py
tests/unittest/_torch/attention/test_prims_ts_fmha.py

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tensorrt-cicd · 2026-10-14T15:44:56Z

PR_Github #77851 [ run ] completed with state ABORTED. Commit: 0b3d0cf

Link to invocation

yuxianq · 2026-10-14T15:45:58Z

@farazkh80, could you help to review this PR as trt-llm-torch-attention-devs? Thanks~

Assignment explanation

Components	kernels/prims-ts (72%); fmha/prims-ts (25%); integration/dependencies (3%)
Tags	algorithm:dense (50%); algorithm:sparse (50%); phase:prefill (40%); phase:decode (60%); features:quantization (70%); features:paged-kv (30%)
PR effort	13 points — Visible changes introduce capabilities across dense/sparse planning, mixed-dtype kernel resources and quantized softmax interfaces. Reviewing their interacting layout, scheduling and numerical contracts warrants 13 points; the estimate reflects kernel complexity, not vendor churn or backport status.
Importance	Important — Independent K/V planning types propagate into context load-resource contracts and decode buffer addressing. Sparse metadata head sharing and new planning exports also change behavior and interfaces, making this a sensitive attention correctness/performance change.
Affinity (0–1)	0.417 component/tag match; 0.313 after PIC preference
Outstanding points at selection	14 → 27 (+13)
Points already reserved on this PR	0
Effective weight	1
Completed review points (preceding 168 hours)	80
Combined points after assignment	107
Demand-derived target	81.00 points (soft share)
Additional fair share before assignment	0.00 points
Share explanation	Whole PR / qualification or coverage constraint exceeds a soft share; assignment is allowed.
Selection rule	affinity with half-share guard

Affinity and workload are snapshots at selection, not live counters. Existing reservations on this PR are counted once.

tensorrt-cicd · 2026-10-14T19:44:02Z

PR_Github #77854 [ run ] completed with state SUCCESS. Commit: 0b3d0cf
/LLM/release-1.3/L0_MergeRequest_PR pipeline #218 completed with status: 'FAILURE'

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yuxianq · 2026-10-15T02:07:45Z

/bot run --disable-fail-fast

tensorrt-cicd · 2026-10-15T02:14:24Z

PR_Github #77959 [ run ] triggered by Bot. Commit: 0b3d0cf Link to invocation

yuxianq · 2026-10-15T05:56:46Z

@farazkh80 This is a backport PR, so I will fix all the commented issues in a follow-up PR #20381 instead. It will make mass integration from release/1.3 to main easier. Thanks~

tensorrt-cicd · 2026-10-15T08:37:58Z

PR_Github #77959 [ run ] completed with state SUCCESS. Commit: 0b3d0cf
/LLM/release-1.3/L0_MergeRequest_PR pipeline #230 completed with status: 'SUCCESS'

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farazkh80

Approved from attention perspective. Thanks for addressing the comments in the follow-up PR!

github-actions · 2026-10-15T17:12:30Z

Automatically added "ci: full pre-merge approved" because this PR has satisfied the required GitHub review approvals. Unresolved review conversations and other required checks remain independent merge requirements.

[None][chore] Refresh PrimTS vendor source onto FlashInfer main (NVID…

0b3d0cf

…IA#20155) Signed-off-by: Yuxian Qiu <142763828+yuxianq@users.noreply.github.com> (cherry picked from commit fca0803) Signed-off-by: Yuxian Qiu <142763828+yuxianq@users.noreply.github.com>

github-actions Bot assigned yuxianq Oct 14, 2026

yuxianq marked this pull request as ready for review October 14, 2026 15:32

yuxianq requested review from a team as code owners October 14, 2026 15:32

yuxianq requested review from pengbowang-nv, tburt-nv, yiqingy0 and yunruis October 14, 2026 15:32

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Comment thread tests/unittest/_torch/attention/sparse/test_prims_ts_block_sparse.py Resolved

yuxianq requested review from farazkh80 and removed request for pengbowang-nv and yunruis October 14, 2026 15:46

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yuxianq mentioned this pull request Oct 15, 2026

[None][fix] Follow up PrimTS refresh backport review tests and docs #20381

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yuxianq merged commit f8033a0 into NVIDIA:release/1.3 Oct 16, 2026

yuxianq mentioned this pull request Oct 16, 2026

[https://nvbugs/6791733][fix] Guard PrimTS ragged Q tensor maps on Blackwell #20298

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coderabbitai Bot commented Oct 14, 2026 •

edited

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yuxianq commented Oct 14, 2026 •

edited

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