CUDA: Add mul_mat_id support for the mmf kernel (llama/15767)

* CUDA: Add mul_mat_id support the mmf

Add support for mul_mat_id for bs < 16

* Review: use warp_size, fix should_use_mmf condition

* Launch one block per expert, stride along n_expert_used

* templatize mul_mat_id

* Pad shmem to 16 bytes, add helper function mul_mat_f_switch_ids

* Reduce compile times by dividing mmf into f16, bf16 and f32 variants

* Divide mmf by ncols_dst

* Add missing files

* Fix MUSA/HIP builds

Author: am17an

src/ggml-cuda/CMakeLists.txt

@@ -48,6 +48,8 @@ if (CUDAToolkit_FOUND)
     list(APPEND GGML_SOURCES_CUDA ${SRCS})
     file(GLOB   SRCS "template-instances/mmq*.cu")
     list(APPEND GGML_SOURCES_CUDA ${SRCS})
+    file(GLOB   SRCS "template-instances/mmf*.cu")
+    list(APPEND GGML_SOURCES_CUDA ${SRCS})
 
     if (GGML_CUDA_FA_ALL_QUANTS)
         file(GLOB   SRCS "template-instances/fattn-vec*.cu")

src/ggml-cuda/ggml-cuda.cu

@@ -2109,6 +2109,11 @@ static void ggml_cuda_mul_mat_id(ggml_backend_cuda_context & ctx, ggml_tensor *
             ggml_cuda_mul_mat_q(ctx, src0, src1, ids, dst);
             return;
         }
+
+        if (ggml_cuda_should_use_mmf(src0->type, cc, WARP_SIZE, src0->ne, src1->ne[2])) {
+            ggml_cuda_mul_mat_f(ctx, src0, src1, ids, dst);
+            return;
+        }
     }
 
     cudaStream_t stream = ctx.stream();

src/ggml-cuda/mma.cuh

@@ -1,3 +1,4 @@
+#pragma once
 // This file contains primitives that expose the tensor core PTX instructions for CUDA code.
 // The primitives can be used in a similar way as the nvcuda::wmma interface but with a well-defined memory layout.
 // The documentation for the PTX instructions can be found under:

src/ggml-cuda/mmf.cu

@@ -34,6 +34,13 @@
 DECL_MMQ_CASE({type});
 """
 
+SOURCE_MMF = """// This file has been autogenerated by generate_cu_files.py, do not edit manually.
+
+#include "../mmf.cuh"
+
+DECL_MMF_CASE({type});
+"""
+
 
 def get_short_name(long_quant_name):
     return long_quant_name.replace("GGML_TYPE_", "").lower()
@@ -76,3 +83,7 @@ def get_head_sizes(type_k, type_v):
 for type in TYPES_MMQ:
     with open(f"mmq-instance-{get_short_name(type)}.cu", "w") as f:
         f.write(SOURCE_MMQ.format(type=type))
+
+for type in range(1, 17):
+    with open(f"mmf-instance-ncols_{type}.cu", "w") as f:
+        f.write(SOURCE_MMF.format(type=type))

src/ggml-cuda/mmf.cuh

@@ -0,0 +1,5 @@
+// This file has been autogenerated by generate_cu_files.py, do not edit manually.
+
+#include "../mmf.cuh"
+
+DECL_MMF_CASE(1);

src/ggml-cuda/template-instances/generate_cu_files.py

@@ -0,0 +1,5 @@
+// This file has been autogenerated by generate_cu_files.py, do not edit manually.
+
+#include "../mmf.cuh"
+
+DECL_MMF_CASE(10);

src/ggml-cuda/template-instances/mmf-instance-ncols_1.cu

@@ -0,0 +1,5 @@
+// This file has been autogenerated by generate_cu_files.py, do not edit manually.
+
+#include "../mmf.cuh"
+
+DECL_MMF_CASE(11);

src/ggml-cuda/template-instances/mmf-instance-ncols_10.cu

@@ -0,0 +1,5 @@
+// This file has been autogenerated by generate_cu_files.py, do not edit manually.
+
+#include "../mmf.cuh"
+
+DECL_MMF_CASE(12);