[ET-VK] Add VK_KHR_cooperative_matrix dispatch for linear/matmul

backends/vulkan/runtime/graph/ops/glsl/coopmat_mm.glsl

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/*
+ * KHR Cooperative Matrix MM kernel — unified linear + matmul.
+ *
+ * Variants (set in coopmat_mm.yaml):
+ *   matmul_coopmat       row_major weight, no bias  (aten.mm runtime mat2)
+ *   linear_coopmat       prepacked weight, no bias  (aten.linear)
+ *   linear_coopmat_bias  prepacked weight, +bias    (aten.linear w/ bias)
+ *
+ * Computes: D = A * B[ + bias]
+ *   A is [M, K] (row-major).
+ *   B is either [K, N] row-major (matmul), or 4OC x 4IC blocked prepacked
+ *   with t_weight[(k4 * N4 + n4) * 4 + dk] returning a vec4 of 4 N-elements
+ *   at K-row k4*4+dk (linear).
+ *   D is [M, N], buffer storage.
+ *
+ * fp16 x fp16 -> fp32 MMA. When DTYPE=half, inputs/outputs are native fp16
+ * (no conversion, half the bandwidth). When DTYPE=float, inputs are fp32
+ * with on-the-fly packHalf2x16 conversion at the shared-memory load.
+ *
+ * When HAS_BIAS, bias is staged once into shared memory and broadcast into
+ * each accumulator tile (stride-0 coopMatLoad) before coopMatStore, so
+ * t_output is write-only.
+ *
+ * Tile hierarchy (configurable via yaml; defaults shown for Adreno):
+ *   MMA_*         per-MMA-instruction shape (16x16x16 fp16)
+ *   WG_TILE_*     output tile produced per workgroup (64x64; K-step 32)
+ *   SG_GRID_*     subgroup grid inside the workgroup (2x2 = 4 subgroups)
+ *   SG_TILE_*     per-subgroup output tile (= WG_TILE / SG_GRID; 32x32)
+ *   SUBGROUP_SIZE hardware subgroup width (64 on Adreno)
+ *   WG_SIZE       threads per workgroup (= NUM_SUBGROUPS * SUBGROUP_SIZE)
+ */
+
+#version 450 core
+
+#extension GL_KHR_cooperative_matrix : require
+#extension GL_KHR_memory_scope_semantics : require
+#extension GL_KHR_shader_subgroup_basic : enable
+#extension GL_EXT_shader_explicit_arithmetic_types : require
+#extension GL_EXT_shader_explicit_arithmetic_types_float16 : require
+#extension GL_EXT_control_flow_attributes : enable
+
+#define PRECISION ${PRECISION}
+
+$if DTYPE == "half":
+  #define IS_FP16_INPUT
+$if DTYPE == "float":
+  #define IS_FP32_INPUT
+
+$if HAS_BIAS:
+  #define HAS_BIAS
+
+$if WEIGHT_LAYOUT == "prepacked":
+  #define WEIGHT_PREPACKED
+
+layout(std430) buffer;
+
+#include "common.glslh"
+
+// Bindings: output(0), mat1(1), weight(2), [bias(3)]
+${layout_declare_tensor(B, "w", "t_output", DTYPE, "buffer", is_scalar_array=True)}
+${layout_declare_tensor(B, "r", "t_mat1", DTYPE, "buffer", is_scalar_array=False)}
+${layout_declare_tensor(B, "r", "t_weight", DTYPE, "buffer", is_scalar_array=False)}
+$if HAS_BIAS:
+  ${layout_declare_tensor(B, "r", "t_bias", DTYPE, "buffer", is_scalar_array=True)}
+
+// UBOs — N comes from out_sizes (linear) or mat2_sizes (matmul).
+${layout_declare_ubo(B, "ivec4", "mat1_sizes")}
+$if WEIGHT_LAYOUT == "prepacked":
+  ${layout_declare_ubo(B, "ivec4", "out_sizes")}
+$else:
+  ${layout_declare_ubo(B, "ivec4", "mat2_sizes")}
+
+layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
+
+// Cooperative-matrix instruction shape (must match a property enumerated by
+// vkGetPhysicalDeviceCooperativeMatrixPropertiesKHR for this device).
+const uint MMA_M = ${MMA_M};
+const uint MMA_N = ${MMA_N};
+const uint MMA_K = ${MMA_K};
+
+// Output tile produced per workgroup.
+const uint WG_TILE_M = ${WG_TILE_M};
+const uint WG_TILE_N = ${WG_TILE_N};
+const uint WG_TILE_K = ${WG_TILE_K};
+
+// Subgroup grid inside the workgroup.
+const uint SG_GRID_X = ${SG_GRID_X};
+const uint SG_GRID_Y = ${SG_GRID_Y};
+const uint SUBGROUP_SIZE = ${SUBGROUP_SIZE};
+const uint NUM_SUBGROUPS = SG_GRID_X * SG_GRID_Y;
+const uint WG_SIZE = NUM_SUBGROUPS * SUBGROUP_SIZE;
+
+// Derived: per-subgroup tile and MMAs per subgroup tile.
+const uint SG_TILE_M = WG_TILE_M / SG_GRID_Y;
+const uint SG_TILE_N = WG_TILE_N / SG_GRID_X;
+const uint MMAS_PER_SG_M = SG_TILE_M / MMA_M;
+const uint MMAS_PER_SG_N = SG_TILE_N / MMA_N;
+
+// fp16: 8 elements per uvec4 (128-bit)
+const uint FP16_PER_VEC4 = 8;
+
+// Shared memory with skew padding
+const uint A_STRIDE_VEC4 = (WG_TILE_K + FP16_PER_VEC4) / FP16_PER_VEC4;
+const uint B_STRIDE_VEC4 = (WG_TILE_N + FP16_PER_VEC4) / FP16_PER_VEC4;
+
+shared uvec4 Ash[WG_TILE_M * A_STRIDE_VEC4];
+shared uvec4 Bsh[WG_TILE_K * B_STRIDE_VEC4];
+
+#ifdef HAS_BIAS
+// fp32 staging buffer so coopMatLoad can broadcast directly into the
+// fp32 accumulator coopmat without a type conversion at the load.
+shared float bias_sh[WG_TILE_N];
+#endif
+
+// Accumulator tiles (fp32)
+coopmat<float, gl_ScopeSubgroup, MMA_M, MMA_N, gl_MatrixUseAccumulator> result[MMAS_PER_SG_M][MMAS_PER_SG_N];
+
+#ifdef IS_FP32_INPUT
+uvec2 f32x4_to_f16x4(vec4 v) {
+    return uvec2(packHalf2x16(v.xy), packHalf2x16(v.zw));
+}
+#endif
+
+void main() {
+    const uvec2 tileID = uvec2(gl_WorkGroupID.xy);
+    const uvec2 warpInTile = uvec2(
+        gl_SubgroupID % SG_GRID_X,
+        gl_SubgroupID / SG_GRID_X);
+
+    const uint K = uint(mat1_sizes.x);
+    const uint M = uint(mat1_sizes.y);
+#ifdef WEIGHT_PREPACKED
+    const uint N = uint(out_sizes.x);
+#else
+    const uint N = uint(mat2_sizes.x);
+#endif
+    const uint K4 = (K + 3u) / 4u;
+    const uint N4 = (N + 3u) / 4u;
+
+    [[unroll]] for (uint i = 0; i < MMAS_PER_SG_M; ++i) {
+        [[unroll]] for (uint j = 0; j < MMAS_PER_SG_N; ++j) {
+            result[i][j] = coopmat<float, gl_ScopeSubgroup, MMA_M, MMA_N, gl_MatrixUseAccumulator>(0.0);
+        }
+    }
+
+    // Thread assignment for A tile (WG_TILE_M rows x INVS_PER_ROW_A uvec4/row)
+    const uint INVS_PER_ROW_A = WG_TILE_K / FP16_PER_VEC4;
+    const uint a_col = gl_LocalInvocationID.x % INVS_PER_ROW_A;
+    const uint a_row_offset = gl_LocalInvocationID.x / INVS_PER_ROW_A;
+
+    // Thread assignment for B tile (WG_TILE_K rows x INVS_PER_ROW_B uvec4/row)
+    const uint INVS_PER_ROW_B = WG_TILE_N / FP16_PER_VEC4;
+    const uint b_col = gl_LocalInvocationID.x % INVS_PER_ROW_B;
+    const uint b_row_offset = gl_LocalInvocationID.x / INVS_PER_ROW_B;
+
+    const uint a_row_base = WG_TILE_M * tileID.y;
+    const uint b_col_base = WG_TILE_N * tileID.x;
+
+    for (uint chunkK = 0; chunkK < K; chunkK += WG_TILE_K) {
+
+        // --- Load A tile -> shared (single pass) ---
+        {
+            uint row = a_row_base + a_row_offset;
+            uint k_elem = chunkK + a_col * FP16_PER_VEC4;
+
+#ifdef IS_FP16_INPUT
+            uint k_hv4 = k_elem / 4;
+            f16vec4 v0 = t_mat1[row * K4 + k_hv4];
+            f16vec4 v1 = t_mat1[row * K4 + k_hv4 + 1];
+            Ash[a_row_offset * A_STRIDE_VEC4 + a_col] = uvec4(
+                packFloat2x16(v0.xy), packFloat2x16(v0.zw),
+                packFloat2x16(v1.xy), packFloat2x16(v1.zw));
+#else
+            uint k_vec4 = k_elem / 4;
+            vec4 v0 = t_mat1[row * K4 + k_vec4];
+            vec4 v1 = t_mat1[row * K4 + k_vec4 + 1];
+            uvec2 h0 = f32x4_to_f16x4(v0);
+            uvec2 h1 = f32x4_to_f16x4(v1);
+            Ash[a_row_offset * A_STRIDE_VEC4 + a_col] = uvec4(h0, h1);
+#endif
+        }
+
+        // --- Load B tile -> shared (single pass) ---
+        {
+            uint k_row = chunkK + b_row_offset;
+            uint n_elem = b_col_base + b_col * FP16_PER_VEC4;
+            uint n4_0 = n_elem >> 2u;
+#ifdef WEIGHT_PREPACKED
+            // Prepacked: t_weight[(k4 * N4 + n4) * 4 + dk] yields vec4 of
+            // 4 N-elements at K-row (k4*4+dk).
+            uint k4 = k_row >> 2u;
+            uint dk = k_row & 3u;
+            uint b_idx0 = (k4 * N4 + n4_0) * 4u + dk;
+            uint b_idx1 = (k4 * N4 + n4_0 + 1u) * 4u + dk;
+#else
+            // Row-major: t_weight[k_row * N4 + n4] yields vec4 of 4 N-elements.
+            uint b_idx0 = k_row * N4 + n4_0;
+            uint b_idx1 = k_row * N4 + n4_0 + 1u;
+#endif
+
+#ifdef IS_FP16_INPUT
+            f16vec4 v0 = t_weight[b_idx0];
+            f16vec4 v1 = t_weight[b_idx1];
+            Bsh[b_row_offset * B_STRIDE_VEC4 + b_col] = uvec4(
+                packFloat2x16(v0.xy), packFloat2x16(v0.zw),
+                packFloat2x16(v1.xy), packFloat2x16(v1.zw));
+#else
+            vec4 v0 = t_weight[b_idx0];
+            vec4 v1 = t_weight[b_idx1];
+            uvec2 h0 = f32x4_to_f16x4(v0);
+            uvec2 h1 = f32x4_to_f16x4(v1);
+            Bsh[b_row_offset * B_STRIDE_VEC4 + b_col] = uvec4(h0, h1);
+#endif
+        }
+
+        barrier();
+
+        // --- Cooperative matrix MMA ---
+        [[unroll]] for (uint k = 0; k < WG_TILE_K / MMA_K; ++k) {
+            uint k_start = MMA_K * k;
+
+            coopmat<float16_t, gl_ScopeSubgroup, MMA_M, MMA_K, gl_MatrixUseA> matA[MMAS_PER_SG_M];
+            [[unroll]] for (uint i = 0; i < MMAS_PER_SG_M; ++i) {
+                uint row_a = MMA_M * (MMAS_PER_SG_M * warpInTile.y + i);
+                coopMatLoad(
+                    matA[i], Ash,
+                    row_a * A_STRIDE_VEC4 + k_start / FP16_PER_VEC4,
+                    A_STRIDE_VEC4,
+                    gl_CooperativeMatrixLayoutRowMajor);
+            }
+
+            coopmat<float16_t, gl_ScopeSubgroup, MMA_K, MMA_N, gl_MatrixUseB> matB;
+            [[unroll]] for (uint j = 0; j < MMAS_PER_SG_N; ++j) {
+                uint col_b = MMA_N * (MMAS_PER_SG_N * warpInTile.x + j) / FP16_PER_VEC4;
+                coopMatLoad(
+                    matB, Bsh,
+                    k_start * B_STRIDE_VEC4 + col_b,
+                    B_STRIDE_VEC4,
+                    gl_CooperativeMatrixLayoutRowMajor);
+
+                [[unroll]] for (uint i = 0; i < MMAS_PER_SG_M; ++i) {
+                    result[i][j] = coopMatMulAdd(matA[i], matB, result[i][j]);
+                }
+            }
+        }
+
+        barrier();
+    }
+
+#ifdef HAS_BIAS
+    // Stage one WG_TILE_N-wide row of bias into shared memory. The C++ dispatch
+    // gate ensures N % WG_TILE_N == 0, so no per-element bounds check is needed.
+    {
+        const uint tile_n_start = WG_TILE_N * tileID.x;
+        for (uint t = gl_LocalInvocationID.x; t < WG_TILE_N; t += WG_SIZE) {
+            bias_sh[t] = float(t_bias[tile_n_start + t]);
+        }
+    }
+    memoryBarrierShared();
+    barrier();
+#endif
+
+    // --- Store result (with bias folded in pre-store, if present) ---
+    [[unroll]] for (uint i = 0; i < MMAS_PER_SG_M; ++i) {
+        [[unroll]] for (uint j = 0; j < MMAS_PER_SG_N; ++j) {
+            uint gi = WG_TILE_M * tileID.y + MMA_M * (MMAS_PER_SG_M * warpInTile.y + i);
+            uint gj = WG_TILE_N * tileID.x + MMA_N * (MMAS_PER_SG_N * warpInTile.x + j);
+
+#ifdef HAS_BIAS
+            // Stride-0 row-major load broadcasts MMA_N bias values across all
+            // MMA_M rows of the accumulator tile.
+            uint local_n = MMA_N * (MMAS_PER_SG_N * warpInTile.x + j);
+            coopmat<float, gl_ScopeSubgroup, MMA_M, MMA_N, gl_MatrixUseAccumulator> bias_tile;
+            coopMatLoad(
+                bias_tile, bias_sh,
+                local_n, /*stride=*/0u,
+                gl_CooperativeMatrixLayoutRowMajor);
+            result[i][j] += bias_tile;
+#endif
+
+#ifdef IS_FP16_INPUT
+            coopmat<float16_t, gl_ScopeSubgroup, MMA_M, MMA_N, gl_MatrixUseAccumulator> out_tile =
+                coopmat<float16_t, gl_ScopeSubgroup, MMA_M, MMA_N, gl_MatrixUseAccumulator>(result[i][j]);
+            coopMatStore(
+                out_tile, t_output,
+                gi * N + gj, N,
+                gl_CooperativeMatrixLayoutRowMajor);
+#else
+            coopMatStore(
+                result[i][j], t_output,
+                gi * N + gj, N,
+                gl_CooperativeMatrixLayoutRowMajor);
+#endif
+        }
+    }
+}

backends/vulkan/runtime/graph/ops/glsl/coopmat_mm.yaml

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+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Unified KHR Cooperative Matrix MM kernel (linear + matmul).
+# Three shader variants over two weight layouts:
+#   matmul_coopmat       row_major weight, no bias  (aten.mm runtime mat2)
+#   linear_coopmat       prepacked weight, no bias  (aten.linear)
+#   linear_coopmat_bias  prepacked weight, +bias    (aten.linear with bias)
+
+coopmat_mm:
+  parameter_names_with_default_values:
+    DTYPE: float
+    PRECISION: highp
+    WEIGHT_LAYOUT: row_major
+    HAS_BIAS: false
+    MMA_M: 16
+    MMA_N: 16
+    MMA_K: 16
+    WG_TILE_M: 64
+    WG_TILE_N: 64
+    WG_TILE_K: 32
+    SG_GRID_X: 2
+    SG_GRID_Y: 2
+    SUBGROUP_SIZE: 64
+  generate_variant_forall:
+    DTYPE:
+      - VALUE: float
+      - VALUE: half
+  shader_variants:
+    - NAME: matmul_coopmat
+      WEIGHT_LAYOUT: row_major
+    - NAME: linear_coopmat
+      WEIGHT_LAYOUT: prepacked
+    - NAME: linear_coopmat_bias
+      WEIGHT_LAYOUT: prepacked
+      HAS_BIAS: true