[XPU][Mamba] Add Triton-based selective scan forward op for XPU by mfylcek · Pull Request #41137 · vllm-project/vllm

mfylcek · 2026-04-28T13:05:21Z

Purpose

Adds a Triton implementation of the Mamba selective scan forward pass (selective_scan_fwd) to enable Mamba1 prefill on Intel XPU devices.

The existing selective_scan_fwd op in vllm/_custom_ops.py delegates to a kernel (torch.ops._C.selective_scan_fwd) that is not available on XPU.

Test Plan

Test Result

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github-actions · 2026-04-28T13:05:32Z

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jikunshang · 2026-04-28T13:46:40Z

 ):
+    from vllm.platforms import current_platform
+
+    if current_platform.is_xpu():


we should not add such if branch in this file.

jikunshang · 2026-04-28T13:47:30Z

and an ongoing refactor is #41126
besides, please fix DCO issue!

…ect#41761) Signed-off-by: yewentao256 <zhyanwentao@126.com> Signed-off-by: Nick Hill <nickhill123@gmail.com> Co-authored-by: Nick Hill <nickhill123@gmail.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

…oject#36517) Signed-off-by: Patrick Schlangen <pschlan@amd.com>

…uired tool_choice (vllm-project#42292) Signed-off-by: chaunceyjiang <chaunceyjiang@gmail.com>

…42217) Signed-off-by: zitian.zhao <zitian.zhao@tencentmusic.com>

Signed-off-by: Yasmin Moslem <48152713+ymoslem@users.noreply.github.com> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

…formance (vllm-project#40657) Signed-off-by: Lucas Kabela <lucaskabela@meta.com>

Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com> Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io> Signed-off-by: wang.yuqi <noooop@126.com> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Signed-off-by: khluu <khluu000@gmail.com>

…fer_nvlink_one_sided backends (vllm-project#41382) Signed-off-by: amitz-nv <203509407+amitz-nv@users.noreply.github.com>

…lm-project#35540) Signed-off-by: kg6-sleipnir <christopherhazen42@gmail.com> Signed-off-by: chazen <45186108+kg6-sleipnir@users.noreply.github.com> Co-authored-by: Chauncey <chaunceyjiang@gmail.com>

…oject#42387) Signed-off-by: khluu <khluu000@gmail.com>

…vllm-project#42355) Signed-off-by: khluu <khluu000@gmail.com>

…-project#42388) Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com>

…False-False-5-32-bigcode/starcoder2-3b) (vllm-project#42392) Signed-off-by: haosdent <haosdent@gmail.com>

Signed-off-by: Florian Woerner <florian.woerner@onmyown.io> Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

…oject#41771) Signed-off-by: Yan Ma <yan.ma@intel.com> Co-authored-by: Qiming Zhang <qiming1.zhang@intel.com> Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>

Signed-off-by: Kunshang Ji <jikunshang95@gmail.com>

…llm-project#41664)

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

…ss (vllm-project#41046) Signed-off-by: Bill Nell <bnell@redhat.com> Signed-off-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com> Signed-off-by: Robert Shaw <robertgshaw2@gmail.com> Co-authored-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com> Co-authored-by: Robert Shaw <robertgshaw2@gmail.com>

…llm-project#42334) Signed-off-by: Bill Nell <bnell@redhat.com>

vllm-project#42097) Signed-off-by: ZhanqiuHu <zhu@redhat.com> Signed-off-by: Zhanqiu Hu <zhu@redhat.com> Signed-off-by: NickLucche <nlucches@redhat.com> Co-authored-by: NickLucche <nlucches@redhat.com>

…ect#42153) Signed-off-by: jiahanc <173873397+jiahanc@users.noreply.github.com> Co-authored-by: Yongye Zhu <zyy1102000@gmail.com>

…n every CPython (vllm-project#41516) Signed-off-by: mgoin <mgoin64@gmail.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

…llm-project#43073) Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

…tion + clear_cache (vllm-project#42117) Signed-off-by: hao-aaron <ahao@anyscale.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

…oject#42828) Signed-off-by: Yifan Qiao <yifanqiao@inferact.ai>

…ject#43077) Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

Signed-off-by: shen-shanshan <467638484@qq.com>

Signed-off-by: ZhanqiuHu <zhu@redhat.com> Co-authored-by: Nicolò Lucchesi <nlucches@redhat.com>

…te` (vllm-project#42887) Signed-off-by: Sage Ahrac <sagiahrak@gmail.com>

Signed-off-by: Marceli Fylcek <marceli.fylcek@intel.com>

mergify Bot added the intel-gpu Related to Intel GPU label Apr 28, 2026

jikunshang reviewed Apr 28, 2026

View reviewed changes

yewentao256 and others added 25 commits May 19, 2026 18:27

Add VLLM_USE_SPINLOOP_EXT to use more efficient busy polling (vllm-pr…

7a1d2c2

…oject#36517) Signed-off-by: Patrick Schlangen <pschlan@amd.com>

[Bugifx] [Qwen3CoderTool] Restore supports_required_and_named for req…

c7c4907

…uired tool_choice (vllm-project#42292) Signed-off-by: chaunceyjiang <chaunceyjiang@gmail.com>

[Fix] Gemma4 Mixed-Resolution Image Co-Batching Crash (vllm-project#…

afaae29

…42217) Signed-off-by: zitian.zhao <zitian.zhao@tencentmusic.com>

[Bugfix][Performance Improvement] Improve penalties triton kernel per…

505ba31

…formance (vllm-project#40657) Signed-off-by: Lucas Kabela <lucaskabela@meta.com>

[XPU] update dp rank w/o env-var isolation (vllm-project#39856)

5fcd162

Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com> Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>

[Frontend] Consolidate Speech to Text entrypoints. (vllm-project#42370)

9468720

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io> Signed-off-by: wang.yuqi <noooop@126.com> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

[CI] Migrate more B200 jobs to b200-k8s queue (vllm-project#42356)

13efe52

Signed-off-by: khluu <khluu000@gmail.com>

[Bugfix] Fix double reduce in flashinfer_nvlink_two_sided and flashin…

8b7e076

…fer_nvlink_one_sided backends (vllm-project#41382) Signed-off-by: amitz-nv <203509407+amitz-nv@users.noreply.github.com>

[CI] Migrate remaining B200 jobs to b200-k8s with test fixes (vllm-pr…

d9409c2

…oject#42387) Signed-off-by: khluu <khluu000@gmail.com>

[CI] Move DockerHub and PyPI publish steps to end of release pipeline (…

814165c

…vllm-project#42355) Signed-off-by: khluu <khluu000@gmail.com>

[UT][XPU] fix test_parallel_sampling due to global random state (vllm…

4990b05

…-project#42388) Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com>

[CI] De-flake Language Models Test (Extended Generation) test_models(…

30690b1

…False-False-5-32-bigcode/starcoder2-3b) (vllm-project#42392) Signed-off-by: haosdent <haosdent@gmail.com>

[Doc] Fix typo in llm-d documentation link (vllm-project#42397)

69b4afb

Signed-off-by: Florian Woerner <florian.woerner@onmyown.io> Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

[XPU] keep generator state of sycl kernel align with pytorch (vllm-pr…

5f3a417

…oject#41771) Signed-off-by: Yan Ma <yan.ma@intel.com> Co-authored-by: Qiming Zhang <qiming1.zhang@intel.com> Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>

[XPU] bump up vllm-xpu-kernels to v0.1.8 (vllm-project#42410)

1abae64

Signed-off-by: Kunshang Ji <jikunshang95@gmail.com>

[MXFP4] Support for linear layers + compressed-tensors integration (v…

3ca3dcf

…llm-project#41664)

[Hybrid] Warmup Mamba2 SSD kernel (vllm-project#39822)

70d3f8c

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

[MoE Refactor] Move remaining experts classes to experts directory (v…

aeb5d29

…llm-project#42334) Signed-off-by: Bill Nell <bnell@redhat.com>

[Bugfix] Fix mismatched kernel-per-logical blocks in NIXL HMA transfer (

0491a31

vllm-project#42097) Signed-off-by: ZhanqiuHu <zhu@redhat.com> Signed-off-by: Zhanqiu Hu <zhu@redhat.com> Signed-off-by: NickLucche <nlucches@redhat.com> Co-authored-by: NickLucche <nlucches@redhat.com>

[Perf] Use 2D-grid to eliminate divmod in W8W8 group quant (vllm-proj…

f101b2b

…ect#42153) Signed-off-by: jiahanc <173873397+jiahanc@users.noreply.github.com> Co-authored-by: Yongye Zhu <zyy1102000@gmail.com>

[Build] Build bundled DeepGEMM _C per-Python so the wheel imports o…

6a048e6

…n every CPython (vllm-project#41516) Signed-off-by: mgoin <mgoin64@gmail.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

WoosukKwon and others added 8 commits May 19, 2026 18:28

[Model Refactoring] Move deepseek_v4_ops to models/deepseek_v4 [3/N] (v…

a25b78f

…llm-project#43073) Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

[bug] AsyncScheduler drops first post-resume token after pause_genera…

ba4793c

…tion + clear_cache (vllm-project#42117) Signed-off-by: hao-aaron <ahao@anyscale.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

[KVConnector][DSV4] HMA support for Mooncake store connector (vllm-pr…

c0aadb8

…oject#42828) Signed-off-by: Yifan Qiao <yifanqiao@inferact.ai>

[Model Refactoring] Rename deepseek_v4.py to model.py [4/N] (vllm-pro…

7606745

…ject#43077) Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

[Misc][MM] Remove redundant code in CLIPAttention (vllm-project#43046)

1653445

Signed-off-by: shen-shanshan <467638484@qq.com>

[CI] Add MTP + PD disagg test for Qwen3.5 (vllm-project#42677)

8428a98

Signed-off-by: ZhanqiuHu <zhu@redhat.com> Co-authored-by: Nicolò Lucchesi <nlucches@redhat.com>

[Bugfix] Fix top logprobs token placeholders in `/inference/v1/genera…

72d4c67

…te` (vllm-project#42887) Signed-off-by: Sage Ahrac <sagiahrak@gmail.com>

Move to _xpu_ops

f925bd3

Signed-off-by: Marceli Fylcek <marceli.fylcek@intel.com>

mfylcek force-pushed the selective_scan_triton_v2 branch from 8bf202c to f925bd3 Compare May 19, 2026 16:01

mfylcek closed this May 19, 2026

mfylcek deleted the selective_scan_triton_v2 branch May 19, 2026 16:03

mergify Bot assigned sangstar May 19, 2026

mergify Bot added the kv-connector label May 19, 2026

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[XPU][Mamba] Add Triton-based selective scan forward op for XPU#41137

[XPU][Mamba] Add Triton-based selective scan forward op for XPU#41137
mfylcek wants to merge 847 commits into
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mfylcek:selective_scan_triton_v2

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