[None][feat] Enable xqa jit path for previously precompiled case #7162
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Signed-off-by: Pengbo Wang <[email protected]>
📝 WalkthroughWalkthroughAdds a constexpr Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant Caller
participant Runner as DecoderXQARunner
participant JIT as JIT Impl
participant Pre as Precompiled Impl
Caller->>Runner: getImplFromXQAParams(xqaParams)
Runner->>Runner: read getEnvEnableXQAJIT()
alt Env unset or true
Runner-->>Caller: return JIT
else Env false
Runner-->>Caller: return Precompiled
end
sequenceDiagram
autonumber
participant Host as decoderXQAImplJIT
participant Detect as Kernel Type Detect
participant Support as supportConfig checks
participant HMMA as HMMA Kernel
participant GMMA as GMMA Kernel
participant MLA as MLA Kernel
Host->>Detect: determine isHMMA/isGMMA/isMLA
Detect-->>Support: query per-kernel support
Support-->>Host: support results
alt Speculative decoding enabled
alt HMMA path allowed
Host->>HMMA: pack HMMA spec-dec params (cu_seq_lens, mask, qScale, kv params, etc.)\nlaunch gridDim={multi_block, nbTokenBlocks*kvHeads, batch}, blockDim=(128,1,2)
HMMA-->>Host: return
else GMMA path allowed
Host->>GMMA: existing GMMA spec-dec param pack & launch
GMMA-->>Host: return
else MLA path allowed
Host->>MLA: MLA (or HMMA-in-MLA) spec-dec param pack & launch
MLA-->>Host: return
end
else Non-speculative
Host->>HMMA: or GMMA or MLA standard launch
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Possibly related PRs
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⚠️ Outside diff range comments (1)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp (1)
360-367: Parameter array is too small for the largest branches (risk of OOB writes)kMAX_NB_KERNEL_PARAMS = 15 is insufficient now. Counting appendParam calls:
- HMMA spec-dec branch can append up to 17–19 params (depending on options).
- Non-MLA GMMA spec-dec branch can append 17.
This can overflow kernelParams and corrupt memory.
Please bump capacity and add a compile-time sanity guard:
- constexpr uint32_t kMAX_NB_KERNEL_PARAMS = 15; + // Keep this comfortably above the max observed across all branches (currently ~19). + constexpr uint32_t kMAX_NB_KERNEL_PARAMS = 24;Optionally add a static_assert near each branch documenting the expected upper bound, or switch kernelParams to a std::array<void*, kMAX_NB_KERNEL_PARAMS> and keep using the existing bound checks.
🧹 Nitpick comments (2)
cpp/kernels/xqa/mha_stdheaders.cuh (1)
78-81: Add constexpr infinity(): LGTM with a minor CUDA portability noteThe helper cleanly centralizes +inf and aligns with the new usage site. One small nit: relying on __int_as_float inside a constexpr is generally fine under nvcc, but if this header is ever parsed by a host-only toolchain in GENERATE_CUBIN mode, that intrinsic might not be visible. Consider guarding with a fallback or annotating for device explicitly.
Apply this small tweak if you want to be extra defensive:
- static constexpr float infinity() noexcept - { - return __int_as_float(0x7f800000); - } + DEVICE_FUNC static constexpr float infinity() noexcept + { + // IEEE-754 +Inf bit pattern + return __int_as_float(0x7f800000); + }cpp/kernels/xqa/mha.cu (1)
508-510: Use of -mha::numeric_limits::infinity() instead of -INFINITY: LGTMThis removes reliance on a macro and is consistent with the new numeric_limits shim. As a micro-nit, you could hoist a const float negInf = -mha::numeric_limits::infinity(); outside the inner loops to make intent explicit (the compiler should hoist it anyway).
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📒 Files selected for processing (4)
cpp/kernels/xqa/mha.cu(1 hunks)cpp/kernels/xqa/mha_stdheaders.cuh(1 hunks)cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp(3 hunks)cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQARunner.cpp(0 hunks)
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- cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQARunner.cpp
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**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh}: In C++, close namespaces with a comment naming the namespace (e.g., } // namespace foo)
Prefer const/constexpr variables over #define for constants
Declare variables const if not modified after initialization
Use Allman brace style in C++
C++ filenames use lowerCamelCase and must be case-insensitively unique within a build target
C++ type names use UpperCamelCase
Local variables, methods, and namespaces use lowerCamelCase
Global non-static variables not in anonymous namespace use gPrefix lowerCamelCase (e.g., gExample)
Static globals or globals in anonymous namespaces use sPrefix lowerCamelCase
Locally visible static variables start with 's' (e.g., static std::once_flag sFlag;)
Member variables use mPrefix lowerCamelCase; public members may omit but are encouraged to use 'm'
Constants (enums, global/static/function-scope magic numbers) use kPREFIXED_UPPER_SNAKE (e.g., kDIGIT_NUM)
If macros are unavoidable, use UPPER_SNAKE_CASE (prefer constants over #define)
Constructor parameter that conflicts with a public member name gets trailing underscore (foo_)
Literal suffixes should be uppercase (e.g., 1234L not 1234l)
C++: use spaces only; indent 4 spaces
Run clang-format (LLVM style) before submitting; wrap lines at 120 characters
If formatting must be bypassed, use // clang-format off/on around the section
Prefer smart pointers; use unique_ptr for sole ownership, shared_ptr for shared; weak_ptr only in exceptional cases
Do not use deprecated pre-C++11 smart pointers
Use C++ style comments; avoid C comments except special inline cases; prefer // single-line
Capitalize and punctuate full-sentence comments
Follow Doxygen rules: use //! for comments and //!< for members in C++
Disable code with #if/#endif and mnemonic conditions; avoid commented-out code; avoid dead code
Do not throw exceptions across library boundaries
Use least-forceful casts; avoid removing const/volatile; avoid C-style and functional casts (except constructors); p...
Files:
cpp/kernels/xqa/mha.cucpp/kernels/xqa/mha_stdheaders.cuhcpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{cpp,cxx,cc,cu}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
**/*.{cpp,cxx,cc,cu}: Avoid literal values except for 0, nullptr, true, false; use named constexpr for other literals
Place semicolon of empty for/while loop on a new line
Always use brace-delimited bodies for switch/while/do-for/if/else
Use inline C comments in argument lists when parameter meaning is unclear (e.g., /* checkForErrors = */ false)
Do not use assignment in subexpressions (e.g., if (x = y) ... is forbidden)
Switch on enums should enumerate all values and omit default to catch new values at compile time
Structure switch statements; prohibit fallthrough except between empty cases; each case ends with break or throw; return at end of case not allowed; put break inside braces for compound case
Prefer anonymous namespaces over static for internal linkage of functions
Every defined function must be called at least once (no unused methods)
Files:
cpp/kernels/xqa/mha.cucpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{h,hpp,hxx,hh,cuh,cpp,cxx,cc,cu}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
Parameter names must be consistent between declarations and definitions
Files:
cpp/kernels/xqa/mha.cucpp/kernels/xqa/mha_stdheaders.cuhcpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh,py}
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cpp/kernels/xqa/mha.cucpp/kernels/xqa/mha_stdheaders.cuhcpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{h,hpp,hxx,hh,cuh}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
Header files must use include guards named TRTLLM__H without underscores prefix/suffix (e.g., TRTLLM_FOO_BAR_HELLO_H)
Files:
cpp/kernels/xqa/mha_stdheaders.cuh
🔇 Additional comments (4)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp (4)
212-215: Kernel-type flags are clear and correctly derived from cubinObjThe new flags (isHMMAKernel, isGMMAKernel, isMLAKernel) improve readability of the dispatch branches. No issues.
215-221: Spec-dec + MLA constraint is reasonable; verify HMMA variable-length coverageYou forbid variable generation length for MLA (good). For HMMA spec-dec, the new path should cover both fixed and variable generation lengths; please confirm tests exercise both, since grid sizing differs.
Would you confirm:
- HMMA spec-dec with spec_decoding_is_generation_length_variable = true is exercised in CI?
- Max per-batch q length is respected by your grid sizing (see follow-up comment below)?
488-495: GMMA-only spec-dec constraint in the default path: OK and consistentThe debug check that spec-dec here implies GMMA is consistent with the dedicated HMMA-spec-dec branch above. No action needed.
396-448: I wasn’t able to automatically extract theSpecDecParamsdefinition or amulti_block_modefield—please confirm those indecoderXQAImplCommon.handxqaParams.h. Ensure:• The
SpecDecParamsstruct’s member types (especially formaskandqCuSeqLens) match yourreinterpret_casts.
• There is noxqaParams.multi_block_mode; guard unsupported multi-block by assertingmulti_block == 1.
• All possibleappendParamcalls (including conditional ones for sliding windows, FP8 output, and beam width) fit withinkMAX_NB_KERNEL_PARAMS—bump it if needed.Once verified, apply the refactor diff with these corrections.
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Signed-off-by: Pengbo Wang <[email protected]>
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Actionable comments posted: 0
🧹 Nitpick comments (4)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp (4)
360-367: Kernel param vector cap raised to 20: consider hardening for future additions.20 covers current worst cases, but this area is brittle as params evolve across paths. Two optional hardening ideas:
- Document the maximum param count per path next to this constant for quick validation.
- Add a small helper wrapper that counts params per path and asserts a safety margin (e.g., >= max + 2), so future additions trip fast.
No blocker; just future-proofing.
396-448: HMMA spec-dec path: align pointer types with GMMA path and assert no multi-block; name warp/thread constants.
- Types: In GMMA spec-dec, qCuSeqLens/mask are treated as uint32_t-based. Here they are int*. Aligning to uint32_t improves consistency and avoids ambiguity about sign-extension and ABI expectations, even though it’s typically benign at launch time.
- Multi-block: Since HMMA spec-dec doesn't support multi-block, add a debug assertion to catch accidental enablement.
- Magic numbers: Replace 128/2 with constexprs to clarify intent and ease future tuning.
Suggested diff:
@@ - int const* maskPtr = xqaParams.spec_decoding_packed_mask; - int const* cuQSeqLens = launchParams.cu_seq_lens; + // Keep types consistent with GMMA spec-dec path (uint32_t). + auto const* maskPtr = reinterpret_cast<uint32_t const*>(xqaParams.spec_decoding_packed_mask); + auto const* cuQSeqLens = reinterpret_cast<uint32_t const*>(launchParams.cu_seq_lens); @@ - uint32_t multi_block = 1; + uint32_t multi_block = 1; + TLLM_CHECK_DEBUG(!xqaParams.multi_block_mode); // HMMA spec-dec kernel does not support multi-block mode. @@ - dim3 const blockDim(128, 1, 2); + constexpr uint32_t kHMMAThreadsX = 128; + constexpr uint32_t kHMMAWarpsZ = 2; + dim3 const blockDim(kHMMAThreadsX, 1, kHMMAWarpsZ);Please also double-check (out of band) that the presence/absence of slidingWindowSize in the parameter list exactly matches the HMMA spec-dec cubin signature for both tree and chained tokens; precompiled kernels can be unforgiving if the signature diverges.
493-494: Guard against zero denominator when computing specDecBlocks.If num_q_heads_over_kv > 64, (64 / num_q_heads_over_kv) becomes 0, making divUp’s denominator zero. It’s unlikely in practice, but cheap to guard.
- specDecBlocks = divUp(specDecParams.qSeqLen, 64 / num_q_heads_over_kv); + { + uint32_t denom = 64U / static_cast<uint32_t>(num_q_heads_over_kv); + if (denom == 0U) { denom = 1U; } + specDecBlocks = divUp(specDecParams.qSeqLen, denom); + }
2-2: Update copyright year.Guidelines require the current year. Recommend updating the header to include 2025.
- * Copyright (c) 2020-2023, NVIDIA CORPORATION. All rights reserved. + * Copyright (c) 2020-2025, NVIDIA CORPORATION. All rights reserved.
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**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh}: In C++, close namespaces with a comment naming the namespace (e.g., } // namespace foo)
Prefer const/constexpr variables over #define for constants
Declare variables const if not modified after initialization
Use Allman brace style in C++
C++ filenames use lowerCamelCase and must be case-insensitively unique within a build target
C++ type names use UpperCamelCase
Local variables, methods, and namespaces use lowerCamelCase
Global non-static variables not in anonymous namespace use gPrefix lowerCamelCase (e.g., gExample)
Static globals or globals in anonymous namespaces use sPrefix lowerCamelCase
Locally visible static variables start with 's' (e.g., static std::once_flag sFlag;)
Member variables use mPrefix lowerCamelCase; public members may omit but are encouraged to use 'm'
Constants (enums, global/static/function-scope magic numbers) use kPREFIXED_UPPER_SNAKE (e.g., kDIGIT_NUM)
If macros are unavoidable, use UPPER_SNAKE_CASE (prefer constants over #define)
Constructor parameter that conflicts with a public member name gets trailing underscore (foo_)
Literal suffixes should be uppercase (e.g., 1234L not 1234l)
C++: use spaces only; indent 4 spaces
Run clang-format (LLVM style) before submitting; wrap lines at 120 characters
If formatting must be bypassed, use // clang-format off/on around the section
Prefer smart pointers; use unique_ptr for sole ownership, shared_ptr for shared; weak_ptr only in exceptional cases
Do not use deprecated pre-C++11 smart pointers
Use C++ style comments; avoid C comments except special inline cases; prefer // single-line
Capitalize and punctuate full-sentence comments
Follow Doxygen rules: use //! for comments and //!< for members in C++
Disable code with #if/#endif and mnemonic conditions; avoid commented-out code; avoid dead code
Do not throw exceptions across library boundaries
Use least-forceful casts; avoid removing const/volatile; avoid C-style and functional casts (except constructors); p...
Files:
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{cpp,cxx,cc,cu}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
**/*.{cpp,cxx,cc,cu}: Avoid literal values except for 0, nullptr, true, false; use named constexpr for other literals
Place semicolon of empty for/while loop on a new line
Always use brace-delimited bodies for switch/while/do-for/if/else
Use inline C comments in argument lists when parameter meaning is unclear (e.g., /* checkForErrors = */ false)
Do not use assignment in subexpressions (e.g., if (x = y) ... is forbidden)
Switch on enums should enumerate all values and omit default to catch new values at compile time
Structure switch statements; prohibit fallthrough except between empty cases; each case ends with break or throw; return at end of case not allowed; put break inside braces for compound case
Prefer anonymous namespaces over static for internal linkage of functions
Every defined function must be called at least once (no unused methods)
Files:
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{h,hpp,hxx,hh,cuh,cpp,cxx,cc,cu}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
Parameter names must be consistent between declarations and definitions
Files:
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
**/*.{cpp,cxx,cc,cu,h,hpp,hxx,hh,cuh,py}
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🔇 Additional comments (3)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp (3)
212-212: Clear kernel-type detection for Ampere HMMA. LGTM.Accurately distinguishes HMMA kernels from GMMA/MLA, enabling path-specific handling.
215-221: Spec-dec gating and per-kernel capability checks look correct.
- Enforces uniform/linear constraints for MLA spec-dec.
- Debug-time guards tie launch paths to their support checks.
No action needed.
488-488: Spec-dec under non-MLA path enforced to GMMA. LGTM.This preserves the invariant that GMMA is required for spec-dec in the non-HMMA precompiled path.
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close as implemented in #6078 |
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