457e2288c9f61043c8ed858255239b84e71484aa
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Commits
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1a03cf47f6 |
hexagon: hmx flash attention (#22347)
* hmx: extract shared interleave headers and unify matmul batched * hmx: add HMX-accelerated flash attention for prefill * hmx: replace asm wrappers with Q6_ intrinsics in hmx-utils.h Switches three single-instruction helpers from inline asm to the matching Q6_ intrinsics, matching the style established by aizip f8737609a and used by the upstream PR #21554 hmx-matmul-ops.c rewrite: hmx_set_output_scales asm "bias=mxmem2" -> Q6_bias_mxmem2_A hmx_load_tile_pair_fp16 asm packet -> Q6_activation_hf_mxmem_RR + Q6_weight_hf_mxmem_RR hmx_consume_accumulator_fp16 asm "mxmem=acc" -> Q6_mxmem_AR_after_hf hmx_load_tiles_fp16 stays on inline asm: it uses ":deep" activation streaming, and the mixed Q6_activation_hf_mxmem_RR_deep + non-deep Q6_weight_hf_mxmem_RR pair fails the HMX backend constraint check ("activate weight pair (1) exceeds limit (1)"). The asm bundle keeps both halves in one VLIW packet and avoids the diagnostic. Functionally equivalent — same instructions emitted; the Q6_ intrinsics just give the compiler more visibility for scheduling. * hmx: drop the duplicate interleave_fp16_weight_chunk_to_tiles * hmx: apply upstream optimization to hmx-flash-attn-ops.c apply restrict, __builtin_assume, and pointer accumulation to the three HMX workers (qk_dot, o_update, o_norm) and the matching inline HMX loops in op_hmx_flash_attn_ext. * hmx: unify interleave helper * hmx: multi-thread Q load / O store and enable prefill FA dispatch Extract inline Q-load and O-store loops into worker_pool-parallel helpers (fa_phase_q_load, fa_phase_o_store) so HVX threads split the F32↔F16 conversion work across row ranges. Also relax the softmax threading gate from n_row_vec_cnt >= n_threads to >= 2, which was unnecessarily forcing single-thread fallback when n_rows_g < 512. On the dispatch side, remove the ne[2] != 1 guard that blocked multi-head (prefill) FA from reaching the HTP backend — GQA is already handled internally by both the HMX and HVX flash-attention paths. * hmx: relax matmul pipeline gate to cover k > n shapes (e.g. FFN_down) * hmx: optimize FA softmax mask phase (no-ALiBi fast path + GQA dedup) * hmx: Add an asm memory clobber at the phase boundary to prevent reorder bug * [experimental]: fp16 softmax (EXP2_HF) to accelerate fa Bake log2(e) into qk_scale and use hvx_exp2_hf directly for P and m_diff (base-2 consistent, matches htp-ops-lib). ~22 ALU ops for 64 lanes vs ~44 for the F32 round-trip path. * hmx flash-attn: refine cost model coefficients based on profiling data * hmx flash-attn: replace asm clobber with targeted volatile reads on vtcm_d_tiles * hmx flash-attn: fix prefill correctness (dst indexing, softmax reduce, V stride) * hmx flash-attn: fix p_tiles dual-tile OOB race; enable MT + pipeline * hmx flash-attn: preserve additive mask bias in no-ALiBi fast path The no-ALiBi fast path (max_bias==0) was skipping mask add entirely on the assumption that mask values are only {0, -inf}. This is wrong when the mask carries additive positional bias — those terms were silently dropped. Keep the slope-mul skip (slope≡1.0) but add mask back so the bias survives; vmux still clamps below -16 to -inf. Also add HMX FA coverage to test-backend-ops: prefill shapes (nb=64, nb=32) × {mask on/off} × {ALiBi on/off} × {softcap on/off}, F16 KV, hs ∈ {64, 128}. * hmx: fix softcap+EXP2_HF interaction, tighten matmul pipeline gate, add FA tests - flash-attn: when EXP2_HF is on AND logit_softcap is active, fold log2(e) into the post-tanh multiplier (v_cap) instead of pre-baking it into qk_scale. Pre-baking shifted the tanh knee from x≈c to x≈c/log2(e) and produced numerically wrong softcapped outputs whenever both knobs were enabled. - flash-attn softmax (fa_softmax_thread): replace the union+memcpy scalar extract pattern with HVX vmux-based per-row accumulators on rowmax/rowsum. Add hvx_vec_get_f16 helper in hvx-base.h. Functional parity, less scalar code, clearer hf/qf16 lane-format contract. - matmul (hmx_mat_mul_permuted_qk_0_d16a32): pick pipeline vs sequential layout based on whether the chunker actually yields >=2 n-chunks, instead of the static (m>=128 && n>=256) gate. Avoids paying for output double-buffer + worker dispatch when there is no HMX/HVX overlap to gain (e.g. shapes that collapse to one n-chunk). - tests: add HMX flash-attention coverage over the {mask, ALiBi (max_bias), logit_softcap} cross-product for the prefill path — head_dim 64/128, GQA 4×4, kv=512/nb=64 plus a kv=113/nb=32 non-aligned case. * [Help Wanted]: refactor D matrix computation into separate function for clarity and maintainability * format code * hexagon: looks like -O3 is causing issues with the large code base, switch to -O2 and -flto instead * hexagon: use hex_ prefix for swap_ptr * hexagon: move vtcm_seq_alloc into vtcm-utils.h More vtcm allocator updates are coming so it makes sense to start the separate hdr for it. * hmx-utils: add hmx_prefix for layout converters * hmx-mm: move main hmx_mm functions to the end, remove unused fwd decls, etc * hmx-mm: remove unused qweight_fetch_task_state_t and minor alignment fixes * hmx-fa: minor alignment fixes * hmx-fa: move hmx_flash_atten into hmx-ops.h * hmx-fa: remove redundant workpool pointer in the hmx_fa_ctx, plus minor alignment updates * hmx-fa: minor alignment and simplifications * hexagon: move FA_EXP_F16 option to hostside CMake file * hmx-fa: use hvx_vec_splat_f16 instead of fp16_to_bits * hmx-fa: add hvx_splat_u16/u8 and use that in the fa instead custom hvx_fill * hmx-fa: some more alignment updates in the core fa function * hmx-fa: keep slopes in vtcm in fp16 Saves malloc/free and removes the need for float -> fp16 downcast on every use. * hexagon: consistent noinline usage (after static) * hex-hmx: consistent use FARF_HIGH to enable debug output * hmx-utils: no need for always_inline attr * hex-hmx: consistent noinline usage (static noinline ...) * hex-hmx: simplify init_col_scales * hexagon: fix editorconfig errors * hmx-mm: minor alignment fixes --------- Co-authored-by: Max Krasnyansky <maxk@qti.qualcomm.com> |
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5d14e5d19b |
hexagon: optimization for HMX mat_mul (#21554)
* hexagon: add async HMX worker Introduce hmx-worker (dedicated thread for HMX compute) to overlap HMX matmul with HVX dequant/DMA stages in the pipeline path, replacing the previous synchronous HMX calls that blocked the main thread. * hexagon: cost-based VTCM chunk search for out-stationary matmul * hexagon: fix futex race in hmx_worker_drain Store the boolean to local variable avoid atomic load twice * hex-mm: hmx optimize scatter/transpose and use HMX intrinsics * hex-vmem: drop vmem limit a touch under 3GB on v73 * hexagon: add fwd declaration of htp_context * hex-hmx: replace hmx-worker with hmx-queue that mimics dma-queue interface Simplifies the overall implemantion, reduces thread wakeup roundtrips. * hex-mm: add debug log to hmx work func called from hmx-queue * Update hmx-queue.h Co-authored-by: Max Krasnyansky <max.krasnyansky@gmail.com> --------- Co-authored-by: Kim-Chyan Gan <kgan@qti.qualcomm.com> Co-authored-by: Max Krasnyansky <maxk@qti.qualcomm.com> Co-authored-by: Max Krasnyansky <max.krasnyansky@gmail.com> |
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Yiwei ShaoandGitHub
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ee051c1e4e |
hexagon: support for IQ4_NL and MXFP4 (#21018)
* ggml-hexagon: add IQ4_NL and MXFP4 HMX matmul support - Add IQ4_NL quantization type support to Hexagon backend (buffer set/get tensor repack, mul_mat, mul_mat_id dispatch) - Implement HVX IQ4_NL vec_dot kernels (1x1, 2x1, 2x2) with LUT-based 4-bit index to int8 kvalue dequantization - Add MXFP4 HMX dequantization path with E8M0 scale conversion, including batch-4 fast path and single-tile fallback - Unify quantized row size / scale offset logic to handle Q4_0, Q8_0, IQ4_NL, and MXFP4 in the DMA fetch path * ggml-hexagon: fix SKIP_QUANTIZE src1 address mismatch in mixed-quant models * Fix the pragma indent |
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74c42ee1f4 |
hexagon: add Matrix Extensions (HMX) for Hexagon NPU backend (#20693)
* migrate(vtcm): unify VTCM management for HMX merge - Add HMX fields to htp_context (#ifdef HTP_HAS_HMX): hmx_enabled, hmx_dma, vtcm_scratch_size, exp2_table - Add HTP_VTCM_SESSION_HOLD CMake option (default ON): hold VTCM for entire session instead of per-op acquire/release - Add vtcm_op_acquire/vtcm_op_release inline wrappers: no-op in session-hold mode, delegate in per-op mode - Add VTCM tail reservation for precompute tables (256KB, 64KB aligned) in htp_iface_start under HTP_HAS_HMX - Add HMX init/cleanup hooks in htp_iface_start/stop - Add precompute table recovery in vtcm_acquire after VTCM preemption - Do NOT migrate vtcm_mgr from htp-ops-lib (replaced by tail reservation) * migrate(repack): replace x4x2 with HMX tile-permuted super-block format - Add hmx_block_q4_0/q8_0 struct definitions (scales-first + sequential quants) - Implement forward repack: repack_q4_0_to_hmx_superblock, repack_q8_0_to_hmx_superblock, repack_f16_to_tile_permuted - Implement inverse repack for get_tensor debug verification - Route set_tensor/get_tensor via opt_arch >= 73 to HMX path, else existing HVX x4x2 - MXFP4 on v73+ falls back to HVX x4x2 repack (not memcpy) - Extend supports_op: add IQ4_NL for v73+, F16 tile alignment checks - Tail blocks (K not multiple of 256): repack to x4x2 via pad-repack-truncate - Add CMake GGML_HEXAGON_HMX_TAIL_HVX option (default ON); OFF rejects non-256-aligned K in supports_op * migrate(dma): add dma_queue_push_1d() convenience wrapper for HMX ops Add 1D linear DMA transfer helper to hex-dma.h for upcoming HMX op migration. Reuses existing dma_queue_flush() for sync points instead of adding redundant dma_queue_drain(). * migrate(hmx): reorganize HMX files into htp/hmx/ and simplify HMX locking Move all 14 HMX-related files from htp/ to htp/hmx/ subdirectory for cleaner separation between HVX and HMX code. Simplify HMX hardware locking by replacing the two-level lock design (SHARED HAP lock + custom asm spin-lock) with direct HAP_compute_res_hmx_lock/unlock on the existing vtcm_rctx, which already has HMX capability. Key changes: - Create htp/hmx/ subdirectory with all HMX infrastructure and ops - Replace hmx_mgr_ctx_id + spin-lock with HAP_compute_res_hmx_lock(vtcm_rctx) - Remove hmx_manager_enable/disable_execution() (SHARED lock no longer needed) - Add hmx_set_vtcm_state() call in main.c (was missing, caused null globals) - Update main.c includes to use hmx/ prefix - Clean up duplicate declarations from hmx-worker-pool.h * migrate(hmx-infra): consolidate HMX infrastructure into htp_context - Remove hmx-mgr.c/h: eliminate global HMX state singleton, thread htp_context through all HMX ops - Remove hmx-worker-pool.c/h: replace separate HMX worker pool with main worker_pool API (worker_pool_run_func) - Replace hmx_unit_acquire/release with direct HAP_compute_res_hmx_lock/unlock on ctx->vtcm_rctx - Remove HTP_VTCM_SESSION_HOLD compile option: always use per-op vtcm_acquire/release - Remove hmx_dma from htp_context: HMX ops use ctx->dma[0] instead of separate DMA queue - Simplify main.c init/cleanup: remove hmx_manager_setup/reset and vtcm_op_acquire/release wrappers - Delete upstream llama.cpp AGENTS.md (not applicable to fork) * migrate(flash-attn): remove HTP_EXP2_TABLE_COPIES, use single exp2 table - Remove HTP_EXP2_TABLE_COPIES compile definition and CMake cache variable - Remove table duplication loop in precompute-table.c - Remove worker_index % N sub-table indexing in hmx-flash-attn-ops.c - Fix table_size to 65536 (single 64 KB copy) in main.c The exp2 lookup table is read-only; concurrent VTCM reads do not cause bank conflicts, so duplicating the table wastes 192 KB of VTCM for no benefit. * migrate(dsp-main): add HMX priority dispatch in packet_callback - Add proc_hmx_matmul_req() wrapper for HMX mat_mul (F16 and quantized types) - Add proc_hmx_flash_attn_req() wrapper for HMX simple_flash_attn (FP16 only, falls back to HVX for non-FP16) - Add proc_hmx_rms_norm_req() wrapper using hvx_rms_norm_f32 - Route MUL_MAT, FLASH_ATTN_EXT, RMS_NORM through HMX path when ctx->hmx_enabled - Split RMS_NORM and SCALE into separate case blocks for independent dispatch - All HMX wrappers guarded by #ifdef HTP_HAS_HMX * migrate(cmake-dsp): add HMX source files and -mhmx for v73+ skels Add HTP_VTCM_SESSION_HOLD option (default ON) and v73+ HMX build integration: compile hmx-matmul-ops, hmx-flash-attn-ops, hmx-rms-norm-ops and precompute-table into v73/v75/v79/v81 skels with -mhmx flag and HTP_HAS_HMX=1 definition. v68/v69 skels remain unchanged. * migrate(hmx-ops): fix compile errors in HMX ops for ggml struct compatibility - hmx-matmul-ops.c: include ggml-common.h for block_q4_0/block_q8_0 definitions - hmx-matmul-ops.c: rename quants->qs, scale->d to match upstream ggml field names - hmx-flash-attn-ops.c: suppress -Wunused-function/-Wunused-variable warnings - hmx-flash-attn-ops.c: inline ctx->n_threads, remove unused n_workers variable * hmx: set Q/O element type to fp16 for flash attention The llama.cpp integration passes fp16 Q/O tensors, so qo_fp32_element should be false to match the actual data layout. * hexagon: unify HMX weight format to x4x2, add IQ4_NL and DSP-side fallback Remove the v73+ HMX-specific super-block/tile-permuted weight format and unify all architectures on the HVX x4x2 packed format. The DSP now decides at runtime whether to use the HMX or HVX matmul path based on dimension constraints (M%32, N%32, K%256 alignment), rather than the host rejecting ops in supports_op. This simplifies the host repack logic, eliminates ~400 lines of HMX super-block code, and adds IQ4_NL quantization support across host and DSP. Key changes: - Remove hmx_block_q4_0/q8_0 types, repack functions, and F16 tile permutation (ggml-hexagon.cpp, hmx-quants.h) - Simplify set_tensor/get_tensor to always use x4x2 repack, add IQ4_NL - Force is_host=false so tensor copies go through format conversion - Add HTP_TYPE_IQ4_NL to DSP message protocol (htp-msg.h) - Rewrite DSP dequantizers to work directly on x4x2 layout (hmx-matmul-ops.c) - Fix mxclracc.hf placement: clear per output tile, not once globally - Move HMX eligibility checks to DSP proc_hmx_matmul_req (main.c) - Remove dma_queue_push_1d wrapper, use 2D DMA for weight sub-blocks - Add VTCM allocation overflow asserts - Remove GGML_HEXAGON_HMX_TAIL_HVX build option (CMakeLists.txt) * Enhance HMX debugging capabilities with new tile dumping functions - Introduced hmx_dump_tile_mem and hmx_dump_fp32_tile_region for improved memory layout visualization of tile data. - Updated hmx_dump_tile_rows to provide raw memory output for debugging. - Added debug logging for activation and weight tile pairs during processing to facilitate troubleshooting. - Refined existing macros for dumping HVX vector values to streamline debugging output. These changes aim to enhance the debugging experience for HMX matmul operations, ensuring better visibility into data handling and transformations. * OK for small mat mul * hexagon: fix UDMA roiwidth 16-bit overflow in HMX matmul DMA transfers The UDMA descriptor roiwidth field is 16-bit (max 65535), but large matrix DMA transfers (e.g. 32×2304 = 73728 bytes) exceeded this limit, causing truncated transfers and NaN results. Fix by using 2D DMA (per-row stride × n_rows) instead of 1D (total_size × 1) for all 4 DMA push calls in both x4x2 and fp16 weight paths. Also includes: - Use standard vlut16 instead of _nomatch variant for dequantization - Add per-tile vscatter drain barrier for correctness - Add compile-time HMX_DEBUG_TRACE_VALUES instrumentation (disabled by default) * hexagon: remove HMX RMS norm fallback and re-enable matmul pipeline Remove hmx-rms-norm-ops.c as the HVX RMS norm offers no benefit over the generic unary path. Re-enable DMA pipeline mode for QK matmul. * hexagon: guard all HMX matmul DMA transfers against UDMA 16-bit field overflow All UDMA type1 descriptor fields (roiwidth, roiheight, srcstride, dststride) are 16-bit (max 65535). Commit 40d2a9cc fixed roiwidth overflow in the non-pipeline path by switching from 1D to 2D DMA, but the pipeline path (3 call sites) was left unchanged and still used 1D DMA with chunk_size = n_cols * row_stride as roiwidth, which overflows for any practical matrix size when the pipeline is active. Add a local hmx_dma_push_safe() helper that transparently handles overflow: - Fast path (zero overhead): all params fit in 16 bits -> direct call. - Contiguous block: reshapes into a single 2D descriptor with sub_width that fits in 16 bits, preserving async DMA behavior. - Stride overflow: row-by-row fallback for future large-k models where per-row stride itself exceeds 65535. Convert all 8 external dma_queue_push calls in hmx-matmul-ops.c to use the safe helper, including the 3 pipeline sites (1D -> 2D fix), the FP16 and x4x2 weight paths, qweight_fetch sub-block DMA, and the output-stationary activation fetch. * hexagon: multithread activation/output transfer and add HMX matmul fallback - Replace single-threaded transfer_activation_chunk_fp32_to_fp16 with transfer_activation_chunk_multithread across all HMX matmul paths - Add multi-threaded transfer_output_chunk_multithread for FP16-to-FP32 output store, following the same worker pool pattern - Rename transfer_activation_chunk_no_prefetch back to transfer_activation_chunk_fp32_to_fp16 and clean up stale comments - Add HVX fallback in proc_hmx_matmul_req when HMX matmul returns error * [todo]: dynamic alloc vtcm, cause prefill regression. * hexagon: constrain HMX mxmem tile load region to avoid VTCM bank boundary faults Set activation/weight mxmem Rt to 2047 for single-tile loads and document the 4MB VTCM bank boundary constraint, preventing precise bus errors when dynamic VTCM allocation places tiles near bank edges. * hexagon: split unaligned-M HMX matmul into HMX+HVX phases - keep HMX for the 32-aligned head rows and process tail rows with HVX - force re-quantization for HVX tail after HMX phase to avoid stale VTCM state - preserve fallback behavior when N is unaligned or no aligned M rows exist * hexagon: batch-4 Q4_0 dequantize fast path and remove debug traces Add dequantize_x4x2_q4_0_x4groups_hvx() that processes 4 contiguous K-tiles with a single vmemu + vlut16 per row, reducing per-tile overhead. The dequantize loop now takes the batch-4 path when 4 aligned K-tiles are available within the same column tile, falling back to the original single-tile path otherwise. Also removes HMX_DEBUG_TRACE_VALUES instrumentation blocks that are no longer needed. * hexagon: abort on DSP error and fix HMX-to-HVX fallback quantize flag Promote DSP response error from log to GGML_ABORT for fail-fast behavior. Clear SKIP_QUANTIZE flag when falling back from HMX to HVX matmul so the HVX path correctly re-quantizes activations. * hexagon: support batch matmul. This fix perplexity issue The problem comes from Grouped-Query Attention(GQA). Strides between batches are not well respected TODO: optimize batch matmul to reuse weights between batches. * hexagon: reuse weights in fp16 batch matmul * hexagon: remove unused HMX flash attention operations and precomputation table, remove the log system for test * hexagon: remove unused HVX math helpers, debug infrastructure, and stale build options * hexagon: fix HMX not enabled due to missing force_hvx parameter in IDL * hexagon: remove the unnecessary changes not related to HMX * hexagon: bypass HMX by default * hexagon: add upstream repo link to htp-ops-lib ported file headers * hexagon: restore host buffer support * hexagon: add HMX=1 option for the adb scripts * hex-hmx: improve DMA pipelining * hex-hmx: further improvements to dma pipelining * hex-hmx: minor cleanup * hex-hmx: move hmx lock out of inner loops/calls * hex-hmx: remove unnecessary state and wrappers * hex-hmx: remove hmx dir and unify f32 to f16 conversions * hex-hmx: further unify hvx conversions * hex-hmx: revert f16 converter to the original for now * hex-hmx: minor cleanup for f16 to f32 converter * hex-mm: replace incorrect fp16-to-fp32 hmx converter and reformated related code * hex-dma: move chanied dma push into hex-dma.h header and update hmx-mm * hex-mm: use hex_is_aligned instead of a duplicated hmx_is_aligned * hex-mm: use hvx_vec_splat_f16 in the hmx code * hex-mm: use VLEN and HTP types in hmx-code * hex-mm: remove duplicate QK and defs * hexagon: pre-shuffle quants before vlut16 * hexagon: enable HMX by default * hex-mm: code indent fixes for hmx-matmul * hexagon: update hex-utils to include align/smin/etc helpers and use that in hmx mm * hex-mm: more formatting fixes * hex-mm: minor naming updates in hmx code * hex-mm: remove leftover from rebase conflict * Fix the incorrect indents --------- Co-authored-by: Max Krasnyansky <maxk@qti.qualcomm.com> |