zdnn: refactor codebase + add docs (#16178)

* zdnn: initial matmul refactor

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: rm static from funcs

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: update ggml-zdnn.h

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: change header files to hpp

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: switch to common.hpp

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: move mulmat forward around

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: rm inline from utils

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* ggml-zdnn: code cleanup

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* docs: add zDNN docs

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

---------

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

README.md

@@ -274,6 +274,7 @@ Instructions for adding support for new models: [HOWTO-add-model.md](docs/develo
 | [Vulkan](docs/build.md#vulkan) | GPU |
 | [CANN](docs/build.md#cann) | Ascend NPU |
 | [OpenCL](docs/backend/OPENCL.md) | Adreno GPU |
+| [IBM zDNN](docs/backend/zDNN.md) | IBM Z & LinuxONE |
 | [WebGPU [In Progress]](docs/build.md#webgpu) | All |
 | [RPC](https://github.com/ggml-org/llama.cpp/tree/master/tools/rpc) | All |
 

docs/backend/zDNN.md

@@ -0,0 +1,61 @@
+# llama.cpp for IBM zDNN Accelerator
+
+## Background
+
+IBM zDNN (Z Deep Neural Network) is a hardware acceleration library designed specifically to leverage the IBM NNPA (Neural Network Processor Assist) accelerator located within IBM Telum I and II processors. It provides significant performance improvements for neural network inference operations.
+
+### Llama.cpp + IBM zDNN
+
+The llama.cpp zDNN backend is designed to enable llama.cpp on IBM z17 and later systems via the IBM zDNN hardware acceleration library.
+
+## Software & Hardware Support
+
+| Hardware Level       | Status        | Verified                   |
+| -------------------- | ------------- | -------------------------- |
+| IBM z17 / LinuxONE 5 | Supported     | RHEL 9.6, IBM z17, 40 IFLs |
+| IBM z16 / LinuxONE 4 | Not Supported |                            |
+
+## Data Types Supported
+
+| Data Type | Status    |
+| --------- | --------- |
+| F32       | Supported |
+| F16       | Supported |
+| BF16      | Supported |
+
+## CMake Options
+
+The IBM zDNN backend has the following CMake options that control the behaviour of the backend.
+
+| CMake Option | Default Value | Description                         |
+| ------------ | ------------- | ----------------------------------- |
+| `GGML_ZDNN`  | `OFF`         | Compile llama.cpp with zDNN support |
+| `ZDNN_ROOT`  | `""`          | Override zDNN library lookup        |
+
+## 1. Install zDNN Library
+
+Note: Using the zDNN library provided via `apt` or `yum` may not work correctly as reported in [#15772](https://github.com/ggml-org/llama.cpp/issues/15772). It is preferred that you compile from source.
+
+```sh
+git clone --recurse-submodules https://github.com/IBM/zDNN
+cd zDNN
+
+autoreconf .
+./configure --prefix=/opt/zdnn-libs
+
+make build
+sudo make install
+```
+
+## 2. Build llama.cpp
+
+```sh
+git clone https://github.com/ggml-org/llama.cpp
+cd llama.cpp
+
+cmake -S . -G Ninja -B build \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DGGML_ZDNN=ON \
+    -DZDNN_ROOT=/opt/zdnn-libs
+cmake --build build --config Release -j$(nproc)
+```

ggml/include/ggml-zdnn.h

@@ -7,6 +7,9 @@
 extern "C" {
 #endif
 
+// device buffer
+GGML_BACKEND_API ggml_backend_buffer_type_t ggml_backend_zdnn_buffer_type(void);
+
 GGML_BACKEND_API ggml_backend_reg_t ggml_backend_zdnn_reg(void);
 
 #ifdef __cplusplus

ggml/src/ggml-zdnn/.gitignore

@@ -0,0 +1 @@
+zdnn.h

ggml/src/ggml-zdnn/common.hpp

@@ -0,0 +1,59 @@
+#ifndef GGML_ZDNN_COMMON_HPP
+#define GGML_ZDNN_COMMON_HPP
+
+#include "ggml.h"
+#include "ggml-impl.h"
+
+#include "zdnn.h"
+
+#include <vector>
+#include <memory>
+
+#define GGML_ZDNN_NAME    "zDNN"
+#define GGML_ZDNN_VERSION ZDNN_VERNUM
+
+#define ZDNN_CHECK(stmt)                \
+    do {                                \
+        zdnn_status status = (stmt);    \
+        GGML_ASSERT(status == ZDNN_OK); \
+    } while (0);
+
+struct ggml_backend_zdnn_device_context {
+    int zdnn_device;
+    int zdnn_device_ref_count;
+
+    bool has_parmblkformat_0;
+    bool has_parmblkformat_1;  // checks for z17
+
+    size_t max_size;
+
+    char name[128];
+};
+
+struct ggml_backend_zdnn_context {
+    int device;
+    ggml_cgraph * gf;
+};
+
+struct ggml_backend_zdnn_buffer {
+    void * data;
+    ggml_backend_zdnn_buffer * extra;  // for bias, etc.
+    size_t size;
+
+    zdnn_tensor_desc pre_tfm_desc;
+    zdnn_tensor_desc tfm_desc;
+    zdnn_ztensor     ztensor;
+
+    char name[GGML_MAX_NAME];
+};
+
+struct ggml_backend_zdnn_buffer_context {
+    void * all_data;
+    size_t all_size;
+    bool owned;
+
+    int n_buffers;
+    std::vector<std::unique_ptr<ggml_backend_zdnn_buffer>> buffers;
+};
+
+#endif  // GGML_ZDNN_COMMON_HPP

ggml/src/ggml-zdnn/ggml-zdnn-impl.h

@@ -1,98 +0,0 @@
-#ifndef GGML_ZDNN_IMPL
-#define GGML_ZDNN_IMPL
-
-#include "zdnn.h"
-#include "ggml.h"
-#include "ggml-zdnn.h"
-
-#include <vector>
-#include <memory>
-#include <vecintrin.h>
-
-#define GGML_ZDNN_NAME    "zDNN"
-#define GGML_ZDNN_VERSION ZDNN_VERNUM
-
-#define vec_neg(a)    (-(a))                // Vector Negate
-#define vec_add(a, b) ((a) + (b))           // Vector Add
-#define vec_sub(a, b) ((a) - (b))           // Vector Subtract
-#define vec_mul(a, b) ((a) * (b))           // Vector Multiply
-#define vec_div(a, b) ((a) / (b))           // Vector Divide
-#define vec_sl(a, b)  ((a) << (b))          // Vector Shift Left
-#define vec_sra(a, b) ((a) >> (b))          // Vector Shift Right
-#define vec_sr(a, b)  ((a) >> (b))          // Vector Shift Right Algebraic
-#define vec_slo(a, b) vec_slb(a, (b) << 64) // Vector Shift Left by Octet
-#define vec_sro(a, b) vec_srb(a, (b) << 64) // Vector Shift Right by Octet
-
-#ifndef vec_and
-#define vec_and(a, b) ((a) & (b)) // Vector AND
-#endif
-
-#ifndef vec_or
-#define vec_or(a, b)  ((a) | (b)) // Vector OR
-#endif
-
-#ifndef vec_xor
-#define vec_xor(a, b) ((a) ^ (b)) // Vector XOR
-#endif
-
-typedef   signed char char8x16_t  __attribute__((vector_size(16)));
-typedef unsigned char uchar8x16_t __attribute__((vector_size(16)));
-
-typedef int8_t   int8x16_t  __attribute__((vector_size(16)));
-typedef int16_t  int16x8_t  __attribute__((vector_size(16)));
-typedef int32_t  int32x4_t  __attribute__((vector_size(16)));
-typedef uint8_t  uint8x16_t __attribute__((vector_size(16)));
-typedef uint16_t uint16x8_t __attribute__((vector_size(16)));
-typedef uint32_t uint32x4_t __attribute__((vector_size(16)));
-
-typedef float float32x4_t   __attribute__((vector_size(16)));
-typedef double double64x2_t __attribute__((vector_size(16)));
-
-typedef   signed long long long64x2_t  __attribute__((vector_size(16)));
-typedef unsigned long long ulong64x2_t __attribute__((vector_size(16)));
-
-#define ZDNN_CHECK(stmt)                \
-    do {                                \
-        zdnn_status status = (stmt);    \
-        GGML_ASSERT(status == ZDNN_OK); \
-    } while (0);
-
-struct ggml_backend_zdnn_device_context {
-    int zdnn_device;
-    int zdnn_device_ref_count;
-
-    bool has_parmblkformat_0;
-    bool has_parmblkformat_1;
-
-    size_t max_size;
-
-    char name[128];
-};
-
-struct ggml_backend_zdnn_context {
-    int device;
-    ggml_cgraph * gf;
-};
-
-struct ggml_backend_zdnn_buffer {
-    void * data;
-    ggml_backend_zdnn_buffer * extra;  // for bias, etc.
-    size_t size;
-
-    zdnn_tensor_desc pre_tfm_desc;
-    zdnn_tensor_desc tfm_desc;
-    zdnn_ztensor     ztensor;
-
-    char name[GGML_MAX_NAME];
-};
-
-struct ggml_backend_zdnn_buffer_context {
-    void * all_data;
-    size_t all_size;
-    bool owned;
-
-    int n_buffers;
-    std::vector<std::unique_ptr<ggml_backend_zdnn_buffer>> buffers;
-};
-
-#endif  // GGML_ZDNN_IMPL

ggml/src/ggml-zdnn/ggml-zdnn.cpp

@@ -1,188 +1,39 @@
-#include "zdnn.h"
 #include "ggml-zdnn.h"
-#include "ggml-zdnn-impl.h"
-
 #include "ggml-impl.h"
 #include "ggml-backend-impl.h"
 
+#include "ggml-zdnn/common.hpp"
+#include "ggml-zdnn/mmf.hpp"
+#include "ggml-zdnn/utils.hpp"
+#include "ggml.h"
+
 #include <vector>
 #include <memory>
-#include <csignal>
+#include <csignal>  // raise(SIGTRAP)
 #include <unistd.h>
 
-inline zdnn_data_types ggml_zdnn_type_mapping(ggml_type type) {
-    switch (type) {
-        case GGML_TYPE_F32:
-            return FP32;
-        case GGML_TYPE_F16:
-            return FP16;
-        case GGML_TYPE_BF16:
-            return BFLOAT;
-        case GGML_TYPE_I8:
-            return INT8;
-        case GGML_TYPE_I32:
-            return INT32;
-        case GGML_TYPE_Q8_0:
-            return INT8;
-        default:
-            GGML_ABORT("%s: fatal: unable to determine zTensor data type",
-                       __func__);
-            break;
-    }
-}
+static void ggml_zdnn_compute_forward_mul_mat(
+    const ggml_backend_zdnn_context * ctx,
+          ggml_tensor * dst) {
 
-inline void ggml_zdnn_create_tensor(zdnn_tensor_desc  & pre_tfm_desc,
-                                    zdnn_tensor_desc  & tfm_desc,
-                                    zdnn_ztensor      & ztensor,
-                              const ggml_tensor       * src,
-                              const int64_t           * ne,
-                              const zdnn_data_layouts   layout) {
-    zdnn_init_pre_transformed_desc(
-        layout,
-        ggml_zdnn_type_mapping(src->type),
-        &pre_tfm_desc,
-        ne[3], ne[2], ne[1], ne[0]
-    );
+    const ggml_tensor * src0 = dst->src[0];  // weights
+    const ggml_tensor * src1 = dst->src[1];  // inputs
 
-    ZDNN_CHECK(zdnn_generate_transformed_desc(&pre_tfm_desc, &tfm_desc));
-    ZDNN_CHECK(zdnn_init_ztensor_with_malloc(&pre_tfm_desc, &tfm_desc, &ztensor));
+    // TODO: implement support for quantized types
+    // we currently only support f32, f16, and bf16
+    ggml_zdnn_mul_mat_f(ctx, src0, src1, dst);
 }
 
-inline void ggml_zdnn_load_tensor(zdnn_ztensor & ztensor,
-                                          void * buffer) {
-    ZDNN_CHECK(zdnn_transform_ztensor(&ztensor, buffer));
-}
+static bool ggml_zdnn_compute_forward(
+    ggml_backend_zdnn_context * ctx,
+    ggml_tensor * dst) {
 
-inline void ggml_zdnn_init_tensor(ggml_backend_zdnn_buffer * buffer, const ggml_tensor * tensor) {
-    switch (tensor->op) {
+    switch (dst->op) {
         case GGML_OP_MUL_MAT:
             {
-                zdnn_init_pre_transformed_desc(
-                    ZDNN_2D,
-                    ggml_zdnn_type_mapping(tensor->type),
-                    &buffer->pre_tfm_desc,
-                    tensor->ne[1], tensor->ne[0]
-                );
+                ggml_zdnn_compute_forward_mul_mat(ctx, dst);
             } break;
 
-        default:
-            {
-                // For 4D tensors, GGML uses NCHW layout. However, because zDNN
-                // automatically transforms everything to NHWC, we will use it
-                // directly to avoid the performance penalty changing the
-                // layout and reshaping the tensor.
-                zdnn_init_pre_transformed_desc(
-                    ZDNN_NHWC,
-                    ggml_zdnn_type_mapping(tensor->type),
-                    &buffer->pre_tfm_desc,
-                    tensor->ne[3], tensor->ne[2], tensor->ne[1], tensor->ne[0]
-                );
-
-                // TODO: Consider adding a ggml check.
-                // TODO: If tensor = 4D, use ZDNN_NCHW by default.
-                // TODO: If tensor = 2D, use ZDNN_NHWC by default.
-            } break;
-    }
-
-    ZDNN_CHECK(zdnn_generate_transformed_desc(&buffer->pre_tfm_desc, &buffer->tfm_desc));
-    ZDNN_CHECK(zdnn_init_ztensor_with_malloc(&buffer->pre_tfm_desc, &buffer->tfm_desc, &buffer->ztensor));
-}
-
-static void ggml_zdnn_mul_mat_op(ggml_backend_zdnn_context * ctx, const ggml_tensor * src0, const ggml_tensor * src1, ggml_tensor * dst) {
-    GGML_TENSOR_BINARY_OP_LOCALS;
-
-    const enum ggml_type type = src0->type;
-
-    GGML_ASSERT(ne0 == ne01);
-    GGML_ASSERT(ne1 == ne11);
-    GGML_ASSERT(ne2 == ne12);
-    GGML_ASSERT(ne3 == ne13);
-
-    // we don't support permuted src0 or src1
-    GGML_ASSERT(nb00 == ggml_type_size(type));
-    GGML_ASSERT(nb10 == ggml_type_size(src1->type));
-
-    // dst cannot be transposed or permuted
-    GGML_ASSERT(nb0 == sizeof(float));
-    GGML_ASSERT(nb0 <= nb1);
-    GGML_ASSERT(nb1 <= nb2);
-    GGML_ASSERT(nb2 <= nb3);
-
-    const ggml_tensor * weights = src0;
-    const ggml_tensor * inputs  = src1;
-          ggml_tensor * output  = dst;
-
-    ggml_backend_zdnn_buffer * weights_extra = (ggml_backend_zdnn_buffer *)weights->extra;
-    ggml_backend_zdnn_buffer * inputs_extra  = (ggml_backend_zdnn_buffer *)inputs->extra;
-    ggml_backend_zdnn_buffer * output_extra  = (ggml_backend_zdnn_buffer *)output->extra;
-    ggml_backend_zdnn_buffer * bias_extra    = (ggml_backend_zdnn_buffer *)output_extra->extra;
-
-    const int64_t weights_rows = ne01;
-    const int64_t weights_cols = ne00;
-    const int64_t inputs_rows  = ne11;
-    const int64_t inputs_cols  = ne10;
-
-    assert(inputs_cols == weights_cols);
-
-    const int64_t output_rows = ne1;
-    const int64_t output_cols = ne0;
-
-    // GGML_LOG_INFO("%s: tensor '%s' tensor dimensions: [%ld, %ld, %ld, %ld] pre_tfm_desc dimensions: [%ld, %ld, %ld, %ld]\n",
-    //               __func__, weights_extra->name,
-    //               weights->ne[3], weights->ne[2], weights->ne[1], weights->ne[0],
-    //               weights_extra->pre_tfm_desc.dim1,
-    //               weights_extra->pre_tfm_desc.dim2,
-    //               weights_extra->pre_tfm_desc.dim3,
-    //               weights_extra->pre_tfm_desc.dim4);
-
-    // GGML_LOG_INFO("%s: tensor '%s' tensor dimensions: [%ld, %ld, %ld, %ld] pre_tfm_desc dimensions: [%ld, %ld, %ld, %ld]\n",
-    //               __func__, inputs_extra->name,
-    //               inputs->ne[3], inputs->ne[2], inputs->ne[1], inputs->ne[0],
-    //               inputs_extra->pre_tfm_desc.dim1,
-    //               inputs_extra->pre_tfm_desc.dim2,
-    //               inputs_extra->pre_tfm_desc.dim3,
-    //               inputs_extra->pre_tfm_desc.dim4);
-
-    GGML_ASSERT(weights_extra->pre_tfm_desc.dim1 == weights->ne[0] && "weights_extra->pre_tfm_desc.dim1 must match weights->ne[0]");
-    GGML_ASSERT(weights_extra->pre_tfm_desc.dim2 == weights->ne[1] && "weights_extra->pre_tfm_desc.dim2 must match weights->ne[1]");
-    GGML_ASSERT(inputs_extra->pre_tfm_desc.dim1  == inputs->ne[0]  && "inputs_extra->pre_tfm_desc.dim1 must match inputs->ne[0]");
-    GGML_ASSERT(inputs_extra->pre_tfm_desc.dim2  == inputs->ne[1]  && "inputs_extra->pre_tfm_desc.dim2 must match inputs->ne[1]");
-
-    ZDNN_CHECK(zdnn_matmul_transpose_op(&inputs_extra->ztensor, &weights_extra->ztensor, &bias_extra->ztensor,
-                                        false, true, MATMUL_OP_ADDITION, &output_extra->ztensor));
-    // TODO: Remove in the future as we are currently DLF16 -> FP32 then in the next op, FP32 -> DLF16 again. Inefficient.
-    ZDNN_CHECK(zdnn_transform_origtensor(&output_extra->ztensor, output->data));
-
-    GGML_UNUSED(ctx);
-    GGML_UNUSED(weights_rows);
-    GGML_UNUSED(weights_cols);
-    GGML_UNUSED(inputs_rows);
-    GGML_UNUSED(inputs_cols);
-    GGML_UNUSED(output_rows);
-    GGML_UNUSED(output_cols);
-}
-
-static void ggml_zdnn_mul_mat_dispatch(ggml_backend_zdnn_context * ctx, const ggml_tensor * src0, const ggml_tensor * src1, ggml_tensor * dst) {
-    // debug helpers
-    // GGML_LOG_INFO("%s: use_mul_mat_vec   = %d\n", __func__, use_mul_mat_vec);
-    // GGML_LOG_INFO("%s: use_mul_mat_vec_q = %d\n", __func__, use_mul_mat_vec_q);
-    // GGML_LOG_INFO("%s: use_mul_mat_q     = %d\n", __func__, use_mul_mat_q);
-    // GGML_LOG_INFO("%s: src0: %8d %8d %8d %8d\n", __func__, src0->ne[0], src0->ne[1], src0->ne[2], src0->ne[3]);
-    // GGML_LOG_INFO("%s:       %8d %8d %8d %8d\n", __func__, src0->nb[0], src0->nb[1], src0->nb[2], src0->nb[3]);
-    // GGML_LOG_INFO("%s: src1: %8d %8d %8d %8d\n", __func__, src1->ne[0], src1->ne[1], src1->ne[2], src1->ne[3]);
-    // GGML_LOG_INFO("%s:       %8d %8d %8d %8d\n", __func__, src1->nb[0], src1->nb[1], src1->nb[2], src1->nb[3]);
-    // GGML_LOG_INFO("%s: src0 is contiguous %d, transposed %d, type = %s, name = %s\n", __func__, ggml_is_contiguous(src0), ggml_is_transposed(src0), ggml_type_name(src0->type), src0->name);
-    // GGML_LOG_INFO("%s: src1 is contiguous %d, transposed %d, type = %s, name = %s\n", __func__, ggml_is_contiguous(src1), ggml_is_transposed(src1), ggml_type_name(src1->type), src1->name);
-
-    ggml_zdnn_mul_mat_op(ctx, src0, src1, dst);
-}
-
-static bool ggml_zdnn_compute_forward(ggml_backend_zdnn_context * ctx, ggml_tensor * dst) {
-    switch (dst->op) {
-        case GGML_OP_MUL_MAT:
-            ggml_zdnn_mul_mat_dispatch(ctx, dst->src[0], dst->src[1], dst);
-            break;
-
         default:
             return false;
     }

ggml/src/ggml-zdnn/mmf.cpp

@@ -0,0 +1,80 @@
+#include "ggml.h"
+#include "mmf.hpp"
+
+void ggml_zdnn_mul_mat_f(
+    const ggml_backend_zdnn_context * ctx,
+    const               ggml_tensor * src0,
+    const               ggml_tensor * src1,
+                        ggml_tensor * dst) {
+    GGML_TENSOR_BINARY_OP_LOCALS;
+
+    const enum ggml_type type = src0->type;
+
+    GGML_ASSERT(ne0 == ne01);
+    GGML_ASSERT(ne1 == ne11);
+    GGML_ASSERT(ne2 == ne12);
+    GGML_ASSERT(ne3 == ne13);
+
+    // we don't support permuted src0 or src1
+    GGML_ASSERT(nb00 == ggml_type_size(type));
+    GGML_ASSERT(nb10 == ggml_type_size(src1->type));
+
+    // dst cannot be transposed or permuted
+    GGML_ASSERT(nb0 == sizeof(float));
+    GGML_ASSERT(nb0 <= nb1);
+    GGML_ASSERT(nb1 <= nb2);
+    GGML_ASSERT(nb2 <= nb3);
+
+    const ggml_tensor * weights = src0;
+    const ggml_tensor * inputs  = src1;
+          ggml_tensor * output  = dst;
+
+    ggml_backend_zdnn_buffer * weights_extra = (ggml_backend_zdnn_buffer *)weights->extra;
+    ggml_backend_zdnn_buffer * inputs_extra  = (ggml_backend_zdnn_buffer *)inputs->extra;
+    ggml_backend_zdnn_buffer * output_extra  = (ggml_backend_zdnn_buffer *)output->extra;
+    ggml_backend_zdnn_buffer * bias_extra    = (ggml_backend_zdnn_buffer *)output_extra->extra;
+
+    const int64_t weights_rows = ne01;
+    const int64_t weights_cols = ne00;
+    const int64_t inputs_rows  = ne11;
+    const int64_t inputs_cols  = ne10;
+
+    assert(inputs_cols == weights_cols);
+
+    const int64_t output_rows = ne1;
+    const int64_t output_cols = ne0;
+
+    // GGML_LOG_INFO("%s: tensor '%s' tensor dimensions: [%ld, %ld, %ld, %ld] pre_tfm_desc dimensions: [%ld, %ld, %ld, %ld]\n",
+    //               __func__, weights_extra->name,
+    //               weights->ne[3], weights->ne[2], weights->ne[1], weights->ne[0],
+    //               weights_extra->pre_tfm_desc.dim1,
+    //               weights_extra->pre_tfm_desc.dim2,
+    //               weights_extra->pre_tfm_desc.dim3,
+    //               weights_extra->pre_tfm_desc.dim4);
+
+    // GGML_LOG_INFO("%s: tensor '%s' tensor dimensions: [%ld, %ld, %ld, %ld] pre_tfm_desc dimensions: [%ld, %ld, %ld, %ld]\n",
+    //               __func__, inputs_extra->name,
+    //               inputs->ne[3], inputs->ne[2], inputs->ne[1], inputs->ne[0],
+    //               inputs_extra->pre_tfm_desc.dim1,
+    //               inputs_extra->pre_tfm_desc.dim2,
+    //               inputs_extra->pre_tfm_desc.dim3,
+    //               inputs_extra->pre_tfm_desc.dim4);
+
+    GGML_ASSERT(weights_extra->pre_tfm_desc.dim1 == weights->ne[0] && "weights_extra->pre_tfm_desc.dim1 must match weights->ne[0]");
+    GGML_ASSERT(weights_extra->pre_tfm_desc.dim2 == weights->ne[1] && "weights_extra->pre_tfm_desc.dim2 must match weights->ne[1]");
+    GGML_ASSERT(inputs_extra->pre_tfm_desc.dim1  == inputs->ne[0]  && "inputs_extra->pre_tfm_desc.dim1 must match inputs->ne[0]");
+    GGML_ASSERT(inputs_extra->pre_tfm_desc.dim2  == inputs->ne[1]  && "inputs_extra->pre_tfm_desc.dim2 must match inputs->ne[1]");
+
+    ZDNN_CHECK(zdnn_matmul_transpose_op(&inputs_extra->ztensor, &weights_extra->ztensor, &bias_extra->ztensor,
+                                        false, true, MATMUL_OP_ADDITION, &output_extra->ztensor));
+    // TODO: Remove in the future as we are currently DLF16 -> FP32 then in the next op, FP32 -> DLF16 again. Inefficient.
+    ZDNN_CHECK(zdnn_transform_origtensor(&output_extra->ztensor, output->data));
+
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(weights_rows);
+    GGML_UNUSED(weights_cols);
+    GGML_UNUSED(inputs_rows);
+    GGML_UNUSED(inputs_cols);
+    GGML_UNUSED(output_rows);
+    GGML_UNUSED(output_cols);
+}

ggml/src/ggml-zdnn/mmf.hpp

@@ -0,0 +1,12 @@
+#ifndef GGML_ZDNN_MMF_HPP
+#define GGML_ZDNN_MMF_HPP
+
+#include "common.hpp"
+
+void ggml_zdnn_mul_mat_f(
+    const ggml_backend_zdnn_context * ctx,
+    const               ggml_tensor * src0,
+    const               ggml_tensor * src1,
+                        ggml_tensor * dst);
+
+#endif  // GGML_ZDNN_MMF_HPP

ggml/src/ggml-zdnn/utils.cpp

@@ -0,0 +1,79 @@
+#include "ggml.h"
+#include "utils.hpp"
+
+zdnn_data_types ggml_zdnn_type_mapping(ggml_type type) {
+    switch (type) {
+        case GGML_TYPE_F32:
+            return FP32;
+        case GGML_TYPE_F16:
+            return FP16;
+        case GGML_TYPE_BF16:
+            return BFLOAT;
+        case GGML_TYPE_Q8_0:
+            return INT8;
+        case GGML_TYPE_I8:
+            return INT8;
+        case GGML_TYPE_I32:
+            return INT32;
+        default:
+            GGML_ABORT("%s: fatal: unable to determine zTensor data type",
+                       __func__);
+            break;
+    }
+}
+
+void ggml_zdnn_create_tensor(zdnn_tensor_desc  & pre_tfm_desc,
+                             zdnn_tensor_desc  & tfm_desc,
+                             zdnn_ztensor      & ztensor,
+                       const ggml_tensor       * src,
+                       const int64_t           * ne,
+                       const zdnn_data_layouts   layout) {
+    zdnn_init_pre_transformed_desc(
+        layout,
+        ggml_zdnn_type_mapping(src->type),
+        &pre_tfm_desc,
+        ne[3], ne[2], ne[1], ne[0]
+    );
+
+    ZDNN_CHECK(zdnn_generate_transformed_desc(&pre_tfm_desc, &tfm_desc));
+    ZDNN_CHECK(zdnn_init_ztensor_with_malloc(&pre_tfm_desc, &tfm_desc, &ztensor));
+}
+
+void ggml_zdnn_load_tensor(zdnn_ztensor & ztensor, void * buffer) {
+    ZDNN_CHECK(zdnn_transform_ztensor(&ztensor, buffer));
+}
+
+void ggml_zdnn_init_tensor(ggml_backend_zdnn_buffer * buffer, const ggml_tensor * tensor) {
+    switch (tensor->op) {
+        case GGML_OP_MUL_MAT:
+            {
+                zdnn_init_pre_transformed_desc(
+                    ZDNN_2D,
+                    ggml_zdnn_type_mapping(tensor->type),
+                    &buffer->pre_tfm_desc,
+                    tensor->ne[1], tensor->ne[0]
+                );
+            } break;
+
+        default:
+            {
+                // For 4D tensors, GGML uses NCHW layout. However, because zDNN
+                // automatically transforms everything to NHWC, we will use it
+                // directly to avoid the performance penalty changing the
+                // layout and reshaping the tensor.
+                zdnn_init_pre_transformed_desc(
+                    ZDNN_NHWC,
+                    ggml_zdnn_type_mapping(tensor->type),
+                    &buffer->pre_tfm_desc,
+                    tensor->ne[3], tensor->ne[2], tensor->ne[1], tensor->ne[0]
+                );
+
+                // TODO: Consider adding a ggml check.
+                // TODO: If tensor = 4D, use ZDNN_NCHW by default.
+                // TODO: If tensor = 2D, use ZDNN_NHWC by default.
+            } break;
+    }
+
+    ZDNN_CHECK(zdnn_generate_transformed_desc(&buffer->pre_tfm_desc, &buffer->tfm_desc));
+    ZDNN_CHECK(zdnn_init_ztensor_with_malloc(&buffer->pre_tfm_desc, &buffer->tfm_desc, &buffer->ztensor));
+}

ggml/src/ggml-zdnn/utils.hpp

@@ -0,0 +1,19 @@
+#ifndef GGML_ZDNN_UTILITIES_HPP
+#define GGML_ZDNN_UTILITIES_HPP
+
+#include "common.hpp"
+
+zdnn_data_types ggml_zdnn_type_mapping(ggml_type type);
+
+void ggml_zdnn_create_tensor(zdnn_tensor_desc & pre_tfm_desc,
+                             zdnn_tensor_desc & tfm_desc,
+                             zdnn_ztensor     & ztensor,
+                      const ggml_tensor       * src,
+                      const int64_t           * ne,
+                      const zdnn_data_layouts   layout);
+
+void ggml_zdnn_load_tensor(zdnn_ztensor & ztensor, void * buffer);
+
+void ggml_zdnn_init_tensor(ggml_backend_zdnn_buffer * buffer, const ggml_tensor * tensor);
+
+#endif  // GGML_ZDNN_UTILITIES_HPP