sycl : add Q2_K reordered MMVQ and ESIMD kernels (again) (#27490)

* Revert "Revert "sycl : add Q2_K reordered MMVQ and ESIMD kernels (#26336)" (#…"

This reverts commit 7a0e42fd01.

* add gate params

README.md

@@ -7,9 +7,9 @@
 <b>LLM inference in C/C++</b>
 
 [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://opensource.org/licenses/MIT)
-[![Release](https://img.shields.io/github/v/release/ggml-org/llama.cpp?filter=v*)](https://github.com/ggml-org/llama.cpp/releases?q=tag:v0)
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-[![Server](https://github.com/ggml-org/llama.cpp/actions/workflows/server.yml/badge.svg)](https://github.com/ggml-org/llama.cpp/actions/workflows/server.yml)
+[![Release](https://img.shields.io/github/v/release/ggml-org/llama.cpp?filter=v*&color=brightgreen)](https://github.com/ggml-org/llama.cpp/releases?q=tag:v0)
+[![Nightly](https://img.shields.io/github/v/release/ggml-org/llama.cpp?label=nightly&filter=b*&color=orange)](https://github.com/ggml-org/llama.cpp/releases?q=b)
+[![Server](https://img.shields.io/github/actions/workflow/status/ggml-org/llama.cpp/server.yml?label=Server)](https://github.com/ggml-org/llama.cpp/actions/workflows/server.yml)
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ggml/src/ggml-sycl/convert.cpp

@@ -76,6 +76,19 @@ static void dequantize_row_q2_K_sycl(const void *vx, dst_t *y, const int64_t k,
 #endif
 }
 
+template <typename dst_t>
+static void dequantize_row_q2_K_sycl_reorder(const void *vx, dst_t *y, const int64_t k,
+                                             dpct::queue_ptr stream) {
+    const int64_t nb = k / QK_K;
+
+    dpct::has_capability_or_fail(stream->get_device(), { sycl::aspect::fp16 });
+    stream->parallel_for(
+        sycl::nd_range<3>(sycl::range<3>(1, 1, nb) * sycl::range<3>(1, 1, 64), sycl::range<3>(1, 1, 64)),
+        [=](sycl::nd_item<3> item_ct1) {
+            dequantize_block_q2_K_reorder(vx, y, item_ct1, nb);
+        });
+}
+
 template <typename dst_t>
 static void dequantize_row_q3_K_sycl(const void *vx, dst_t *y, const int64_t k,
                                      dpct::queue_ptr stream) {
@@ -667,7 +680,11 @@ to_fp16_sycl_t ggml_get_to_fp16_sycl(ggml_type type, ggml_tensor * dst) {
                 return dequantize_block_sycl<QK8_0, QR8_0, dequantize_q8_0>;
             }
         case GGML_TYPE_Q2_K:
-            return dequantize_row_q2_K_sycl;
+            if (dst->src[0]->extra && ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
+                return dequantize_row_q2_K_sycl_reorder;
+            } else {
+                return dequantize_row_q2_K_sycl;
+            }
         case GGML_TYPE_Q3_K:
             if (dst->src[0]->extra && ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
                 return dequantize_row_q3_K_sycl_reorder;
@@ -753,7 +770,11 @@ to_fp32_sycl_t ggml_get_to_fp32_sycl(ggml_type type, ggml_tensor *dst) {
                 return dequantize_block_sycl<QK8_0, QR8_0, dequantize_q8_0>;
             }
         case GGML_TYPE_Q2_K:
-            return dequantize_row_q2_K_sycl;
+            if (dst->src[0]->extra && ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
+                return dequantize_row_q2_K_sycl_reorder;
+            } else {
+                return dequantize_row_q2_K_sycl;
+            }
         case GGML_TYPE_Q3_K:
             if (dst->src[0]->extra && ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
                 return dequantize_row_q3_K_sycl_reorder;

ggml/src/ggml-sycl/dequantize.hpp

@@ -943,6 +943,47 @@ static void dequantize_block_q2_K(const void * __restrict__ vx, dst_t * __restri
 
 }
 
+template<typename dst_t>
+static void dequantize_block_q2_K_reorder(const void * __restrict__ vx, dst_t * __restrict__ yy,
+                                          const sycl::nd_item<3> & item_ct1, int64_t n_blocks) {
+#if QK_K == 256
+    const int64_t i = item_ct1.get_group(2);
+    if (i >= n_blocks) {
+        return;
+    }
+
+    const uint8_t * base          = static_cast<const uint8_t *>(vx);
+    const size_t    qs_offset     = i * (QK_K / 4);
+    const size_t    scales_offset = n_blocks * (QK_K / 4) + i * (QK_K / 16);
+    const size_t    dm_offset     = n_blocks * (QK_K / 4) + n_blocks * (QK_K / 16) + i * sizeof(ggml_half2);
+
+    const uint8_t *     qs     = base + qs_offset;
+    const uint8_t *     scales = base + scales_offset;
+    const ggml_half2 * dm     = reinterpret_cast<const ggml_half2 *>(base + dm_offset);
+
+    const int64_t tid = item_ct1.get_local_id(2);
+    const int64_t n    = tid / 32;
+    const int64_t l    = tid - 32 * n;
+    const int64_t is   = 8 * n + l / 16;
+
+    const uint8_t q = qs[32 * n + l];
+    dst_t * y = yy + i * QK_K + 128 * n;
+
+    const float dall = (*dm)[0];
+    const float dmin = (*dm)[1];
+    y[l+ 0] = dall * (scales[is+0] & 0xF) * ((q >> 0) & 3) - dmin * (scales[is+0] >> 4);
+    y[l+32] = dall * (scales[is+2] & 0xF) * ((q >> 2) & 3) - dmin * (scales[is+2] >> 4);
+    y[l+64] = dall * (scales[is+4] & 0xF) * ((q >> 4) & 3) - dmin * (scales[is+4] >> 4);
+    y[l+96] = dall * (scales[is+6] & 0xF) * ((q >> 6) & 3) - dmin * (scales[is+6] >> 4);
+#else
+    GGML_UNUSED(vx);
+    GGML_UNUSED(yy);
+    GGML_UNUSED(item_ct1);
+    GGML_UNUSED(n_blocks);
+    GGML_ABORT("Q2_K reorder dequantize not supported for QK_K != 256");
+#endif
+}
+
 template<typename dst_t>
 static void dequantize_block_q3_K(const void * __restrict__ vx, dst_t * __restrict__ yy,
                                   const sycl::nd_item<3> &item_ct1) {

ggml/src/ggml-sycl/dmmv.cpp

@@ -1921,6 +1921,23 @@ ESIMD_INLINE void dequantize_mul_mat_vec_reorder_esimd(
     }
 }
 
+static void dequantize_mul_mat_vec_q2_K_sycl_reorder_esimd(const void *vx, const float *y,
+                                                           float *dst, const int ncols,
+                                                           const int nrows,
+                                                           dpct::queue_ptr stream) {
+    GGML_ASSERT(ncols % QK_K == 0);
+    const int workgroups = (nrows + 1) / 2;
+    stream->submit([&](sycl::handler &h) {
+        sycl::local_accessor<float, 1> lmem(sycl::range<1>(GGML_SYCL_DMMV_ESIMD_WG_SIZE * 2), h);
+        h.parallel_for(
+            sycl::nd_range<1>(sycl::range<1>((size_t)workgroups * GGML_SYCL_DMMV_ESIMD_WG_SIZE), sycl::range<1>(GGML_SYCL_DMMV_ESIMD_WG_SIZE)),
+            [=](sycl::nd_item<1> it) [[intel::sycl_explicit_simd]] {
+                dequantize_mul_mat_vec_reorder_esimd<GGML_TYPE_Q2_K>(
+                    vx, y, dst, ncols, nrows, lmem, it);
+            });
+    });
+}
+
 static void dequantize_mul_mat_vec_q3_K_sycl_reorder_esimd(const void *vx, const float *y,
                                                            float *dst, const int ncols,
                                                            const int nrows,
@@ -2111,7 +2128,15 @@ void ggml_sycl_op_dequantize_mul_mat_vec(
         case GGML_TYPE_Q2_K:
             if ((ggml_tensor_extra_gpu *) dst->src[0]->extra &&
                 ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
-                dequantize_mul_mat_vec_q2_K_sycl_reorder(src0_dd_i, src1_ddf_i, dst_dd_i, ne00, row_diff, stream);
+#ifdef GGML_SYCL_DMMV_HAS_ESIMD
+                if (g_ggml_sycl_enable_esimd) {
+                    dequantize_mul_mat_vec_q2_K_sycl_reorder_esimd(src0_dd_i, src1_ddf_i, dst_dd_i, ne00, row_diff, stream);
+                }
+                else
+#endif
+                {
+                    dequantize_mul_mat_vec_q2_K_sycl_reorder(src0_dd_i, src1_ddf_i, dst_dd_i, ne00, row_diff, stream);
+                }
             } else {
                 dequantize_mul_mat_vec_q2_K_sycl(src0_dd_i, src1_ddf_i, dst_dd_i, ne00, row_diff, stream);
             }

ggml/src/ggml-sycl/esimd.hpp

@@ -61,6 +61,93 @@ static ESIMD_INLINE void unpack_scale_min_k4(
     min_f   = convert<float>(m) * (-dmin);
 }
 
+// ---------------------------------------------------------------------------
+// Q2_K, SOA reorder layout produced by reorder_qw_q2_k:
+//   [qs: nb*(QK_K/4)] [scales: nb*(QK_K/16)] [dm: nb*sizeof(half2)]
+// with nb = nrows*num_blocks_per_row.
+//
+// 2 bits per weight. The 8 output chunks of 32 (matching dequantize_row_q2_K)
+// map to super-chunk s (0..7): byte base 32*(s/4) into the 64-byte qs array,
+// bit shift 2*(s%4); the low 16 lanes use scales[2s], the high 16 use
+// scales[2s+1], with dl = d*(sc & 0xF), ml = dmin*(sc >> 4), deq = dl*q - ml.
+// ---------------------------------------------------------------------------
+template <> struct esimd_reorder_q_traits<GGML_TYPE_Q2_K> {
+    struct ptrs {
+        const uint8_t *    qs;
+        const uint8_t *    scales;
+        const sycl::half * dm;
+    };
+
+    static ESIMD_INLINE ptrs make_ptrs(const void * vx, size_t nb) {
+        const uint8_t * qs     = (const uint8_t *) vx;
+        const uint8_t * scales = qs + nb * (QK_K / 4);
+        const sycl::half * dm  = (const sycl::half *) (scales + nb * (QK_K / 16));
+        return { qs, scales, dm };
+    }
+
+    static ESIMD_INLINE void mac_pair(
+            const ptrs & pa, size_t bia,
+            const ptrs & pb, size_t bib, bool has_b,
+            sycl::ext::intel::esimd::simd<float, 256> & y_vec,
+            sycl::ext::intel::esimd::simd<float, 32> & acc_a,
+            sycl::ext::intel::esimd::simd<float, 32> & acc_b) {
+        using namespace sycl::ext::intel::esimd;
+
+        simd<uint8_t, 64> qs_a     = block_load<uint8_t, 64>(pa.qs + bia * (QK_K / 4));
+        simd<uint8_t, 64> qs_b     = 0;
+        simd<uint8_t, 16> scales_a = block_load<uint8_t, 16>(pa.scales + bia * (QK_K / 16));
+        simd<uint8_t, 16> scales_b = 0;
+
+        const float dall_a = (float) pa.dm[bia * 2 + 0];
+        const float dmin_a = (float) pa.dm[bia * 2 + 1];
+        float dall_b = 0.0f;
+        float dmin_b = 0.0f;
+        if (has_b) {
+            qs_b     = block_load<uint8_t, 64>(pb.qs + bib * (QK_K / 4));
+            scales_b = block_load<uint8_t, 16>(pb.scales + bib * (QK_K / 16));
+            dall_b = (float) pb.dm[bib * 2 + 0];
+            dmin_b = (float) pb.dm[bib * 2 + 1];
+        }
+
+        // per-chunk scale (d * (sc & 0xF)) and min (-dmin * (sc >> 4)), all 16 codes;
+        // min carries the negation so the dequant epilogue adds (matches Q4_K/Q5_K)
+        simd<float, 16> scale_f_a = convert<float>(scales_a & simd<uint8_t, 16>(0x0F)) * dall_a;
+        simd<float, 16> min_f_a   = convert<float>(scales_a >> simd<uint8_t, 16>(4))  * (-dmin_a);
+        simd<float, 16> scale_f_b = convert<float>(scales_b & simd<uint8_t, 16>(0x0F)) * dall_b;
+        simd<float, 16> min_f_b   = convert<float>(scales_b >> simd<uint8_t, 16>(4))  * (-dmin_b);
+
+#pragma unroll
+        for (int s = 0; s < 8; ++s) {
+            const int     byte_base = 32 * (s / 4);
+            const uint8_t shift     = (uint8_t) (2 * (s % 4));
+            simd<float, 32> y_s = y_vec.select<32, 1>(s * 32);
+
+            simd<uint8_t, 32> qa = (qs_a.select<32, 1>(byte_base) >> shift) & simd<uint8_t, 32>(3);
+            simd<uint8_t, 32> qb = (qs_b.select<32, 1>(byte_base) >> shift) & simd<uint8_t, 32>(3);
+
+            const float scale_a_lo = scale_f_a[2 * s + 0];
+            const float scale_a_hi = scale_f_a[2 * s + 1];
+            const float min_a_lo   = min_f_a[2 * s + 0];
+            const float min_a_hi   = min_f_a[2 * s + 1];
+            const float scale_b_lo = scale_f_b[2 * s + 0];
+            const float scale_b_hi = scale_f_b[2 * s + 1];
+            const float min_b_lo   = min_f_b[2 * s + 0];
+            const float min_b_hi   = min_f_b[2 * s + 1];
+
+            simd<float, 32> scale_vec_a = splat_lo_hi(scale_a_lo, scale_a_hi);
+            simd<float, 32> min_vec_a   = splat_lo_hi(min_a_lo, min_a_hi);
+            simd<float, 32> scale_vec_b = splat_lo_hi(scale_b_lo, scale_b_hi);
+            simd<float, 32> min_vec_b   = splat_lo_hi(min_b_lo, min_b_hi);
+
+            simd<float, 32> deq_a = convert<float>(qa) * scale_vec_a + min_vec_a;
+            simd<float, 32> deq_b = convert<float>(qb) * scale_vec_b + min_vec_b;
+
+            acc_a += y_s * deq_a;
+            acc_b += y_s * deq_b;
+        }
+    }
+};
+
 // ---------------------------------------------------------------------------
 // Q3_K, SOA reorder layout produced by reorder_qw_q3_k:
 //   [qs: nb*(QK_K/4)] [hmask: nb*(QK_K/8)] [scales: nb*12] [d: nb*sizeof(half)]

ggml/src/ggml-sycl/ggml-sycl.cpp

@@ -3796,6 +3796,7 @@ inline bool ggml_sycl_supports_reorder_mmvq(enum ggml_type type) {
         case GGML_TYPE_Q1_0:
         case GGML_TYPE_Q4_0:
         case GGML_TYPE_Q8_0:
+        case GGML_TYPE_Q2_K:
         case GGML_TYPE_Q3_K:
         case GGML_TYPE_Q4_K:
         case GGML_TYPE_Q5_K:
@@ -3809,6 +3810,7 @@ inline bool ggml_sycl_supports_reorder_mmvq(enum ggml_type type) {
 static bool ggml_sycl_supports_reorder_esimd(enum ggml_type type) {
 #ifdef GGML_SYCL_DMMV_HAS_ESIMD
     switch (type) {
+        case GGML_TYPE_Q2_K:
         case GGML_TYPE_Q3_K:
         case GGML_TYPE_Q4_K:
         case GGML_TYPE_Q5_K:

ggml/src/ggml-sycl/mmvq.cpp

@@ -1401,6 +1401,65 @@ static void mul_mat_vec_q2_K_q8_1_sycl_switch_ncols(
     }
 }
 
+static void reorder_mul_mat_vec_q2_k_q8_1_sycl(const void * vx, const void * vy, float * dst, const int ncols,
+                                               const int nrows, dpct::queue_ptr stream) {
+    GGML_ASSERT(ncols % QK_K == 0);
+
+    // Round up to a whole number of subgroup-sized workgroups; out-of-range rows are skipped inside the kernel.
+    constexpr size_t num_subgroups = WARP_SIZE;
+    const int block_num_y = ceil_div(nrows, GGML_SYCL_MMV_Y * (int) num_subgroups);
+    const sycl::range<3> block_nums(1, 1, block_num_y);
+    const sycl::range<3> block_dims(1, GGML_SYCL_MMV_Y, num_subgroups * WARP_SIZE);
+
+    stream->submit([&](sycl::handler & cgh) {
+        cgh.parallel_for(sycl::nd_range<3>(block_nums * block_dims, block_dims),
+                         [=](sycl::nd_item<3> nd_item) [[sycl::reqd_sub_group_size(WARP_SIZE)]] {
+                             mul_mat_vec_q_reorder<reorder_vec_dot_q_sycl<GGML_TYPE_Q2_K>>(vx, vy, dst, ncols, nrows,
+                                                                                           nd_item);
+                         });
+    });
+}
+
+template <int ncols_dst>
+static void reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols(
+        const void * vx, const void * vy, float * dst,
+        const int ncols, const int nrows,
+        const int stride_col_y_bytes, const int stride_col_dst,
+        dpct::queue_ptr stream) {
+    GGML_ASSERT(ncols % QK_K == 0);
+    constexpr size_t num_subgroups = WARP_SIZE;
+    const int block_num_y = ceil_div(nrows, GGML_SYCL_MMV_Y * (int) num_subgroups);
+    const sycl::range<3> block_nums(1, 1, block_num_y);
+    const sycl::range<3> block_dims(1, GGML_SYCL_MMV_Y, num_subgroups * WARP_SIZE);
+
+    stream->submit([&](sycl::handler & cgh) {
+        cgh.parallel_for(sycl::nd_range<3>(block_nums * block_dims, block_dims),
+                         [=](sycl::nd_item<3> nd_item) [[sycl::reqd_sub_group_size(WARP_SIZE)]] {
+                             mul_mat_vec_q_reorder_ncols<reorder_vec_dot_q_sycl<GGML_TYPE_Q2_K>, ncols_dst>(
+                                 vx, /*vgate=*/ nullptr, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst,
+                                 /*glu_op=*/ GGML_GLU_OP_SWIGLU, nd_item);
+                         });
+    });
+}
+
+static void reorder_mul_mat_vec_q2_k_q8_1_sycl_switch_ncols(
+        const void * vx, const void * vy, float * dst,
+        const int ncols, const int nrows, const int ncols_dst,
+        const int stride_col_y_bytes, const int stride_col_dst,
+        dpct::queue_ptr stream) {
+    switch (ncols_dst) {
+        case 1: reorder_mul_mat_vec_q2_k_q8_1_sycl(vx, vy, dst, ncols, nrows, stream); break;
+        case 2: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<2>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 3: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<3>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 4: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<4>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 5: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<5>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 6: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<6>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 7: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<7>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        case 8: reorder_mul_mat_vec_q2_k_q8_1_sycl_ncols<8>(vx, vy, dst, ncols, nrows, stride_col_y_bytes, stride_col_dst, stream); break;
+        default: GGML_ABORT("unsupported ncols_dst=%d for Q2_K reorder multi-col MMVQ", ncols_dst);
+    }
+}
+
 static void mul_mat_vec_q3_K_q8_1_sycl(const void *vx, const void *vy,
                                        float *dst, const int ncols,
                                        const int nrows,
@@ -2297,7 +2356,21 @@ void ggml_sycl_op_mul_mat_vec_q(ggml_backend_sycl_context & ctx, const ggml_tens
                 }
                 break;
             case GGML_TYPE_Q2_K:
-                if (i == 0 && src1_ncols > 1 && src1_ncols <= 8) {
+                if ((ggml_tensor_extra_gpu *) dst->src[0]->extra &&
+                    ((ggml_tensor_extra_gpu *) dst->src[0]->extra)->optimized_feature.reorder) {
+                    if (i == 0 && src1_ncols > 1 && src1_ncols <= 8) {
+                        const int stride_col_y_bytes = src1_padded_col_size * q8_1_ts / q8_1_bs;
+                        const int stride_col_dst     = dst->ne[0];
+                        GGML_SYCL_DEBUG("Calling reorder_mul_mat_vec_q2_k_q8_1_sycl_switch_ncols ncols=%d\n", (int)src1_ncols);
+                        reorder_mul_mat_vec_q2_k_q8_1_sycl_switch_ncols(
+                            src0_dd_i, src1_ddq_i, dst_dd_i, ne00, row_diff,
+                            src1_ncols, stride_col_y_bytes, stride_col_dst, stream);
+                        return;
+                    } else {
+                        GGML_SYCL_DEBUG("Calling reorder_mul_mat_vec_q2_k_q8_1_sycl\n");
+                        reorder_mul_mat_vec_q2_k_q8_1_sycl(src0_dd_i, src1_ddq_i_bs, dst_dd_i_bs, ne00, row_diff, stream);
+                    }
+                } else if (i == 0 && src1_ncols > 1 && src1_ncols <= 8) {
                     const int stride_col_y   = src1_padded_col_size / QK8_1;
                     const int stride_col_dst = dst->ne[0];
                     GGML_SYCL_DEBUG("Calling mul_mat_vec_q2_K_q8_1_sycl_switch_ncols ncols=%d\n", (int)src1_ncols);
@@ -2306,6 +2379,7 @@ void ggml_sycl_op_mul_mat_vec_q(ggml_backend_sycl_context & ctx, const ggml_tens
                         src1_ncols, stride_col_y, stride_col_dst, stream);
                     return;
                 } else if (i == 0 || src1_ncols == 1) {
+                    GGML_SYCL_DEBUG("Calling mul_mat_vec_q2_K_q8_1_sycl\n");
                     mul_mat_vec_q2_K_q8_1_sycl(src0_dd_i, src1_ddq_i_bs, dst_dd_i_bs, ne00, row_diff, stream);
                 }
                 break;

ggml/src/ggml-sycl/quants.hpp

@@ -58,6 +58,29 @@ template <> struct block_q_t<GGML_TYPE_Q4_0> {
     static constexpr int block_to_q8_1_ratio() { return traits::qk / QK8_1; }
 };
 
+template <> struct block_q_t<GGML_TYPE_Q2_K> {
+    struct traits {
+        static constexpr uint32_t qk       = QK_K;
+        static constexpr uint32_t qi       = QI2_K;
+        static constexpr uint32_t qr       = QR2_K;
+        static constexpr uint32_t vdr_mmvq = 1;
+    };
+
+    // Reordered layout: [qs (QK_K/4 per block)] [scales (QK_K/16 per block)] [dm]
+    static constexpr std::pair<int, int> get_block_offset(const int block_index, const int /* n_blocks */) {
+        return { block_index * (QK_K / 4), 0 };
+    }
+
+    static constexpr std::pair<int, int> get_d_offset(int nrows, int ncols, const int block_index) {
+        auto nblocks        = (nrows * (ncols / QK_K));
+        auto total_qs_bytes = nblocks * (QK_K / 4);
+        return { total_qs_bytes + block_index * (QK_K / 16),
+                 total_qs_bytes + nblocks * (QK_K / 16) + block_index * sizeof(ggml_half2) };
+    }
+
+    static constexpr int block_to_q8_1_ratio() { return traits::qk / QK8_1; }
+};
+
 template <> struct block_q_t<GGML_TYPE_Q3_K> {
     struct traits {
         static constexpr uint32_t qk       = QK_K;

ggml/src/ggml-sycl/vecdotq.hpp

@@ -429,6 +429,39 @@ template <> struct reorder_vec_dot_q_sycl<GGML_TYPE_Q8_0> {
     }
 };
 
+template <> struct reorder_vec_dot_q_sycl<GGML_TYPE_Q2_K> {
+    static constexpr ggml_type gtype = GGML_TYPE_Q2_K;
+
+    using q2_k_block  = ggml_sycl_reordered::block_q_t<GGML_TYPE_Q2_K>;
+    using q2_k_traits = typename q2_k_block::traits;
+
+    __dpct_inline__ float operator()(const void * __restrict__ vbq, const std::pair<int, int> ibx_offset,
+                                     const std::pair<int, int> d_offset, const int8_t * q8_1_quant_ptr,
+                                     const sycl::half2 * q8_1_ds, const int & iqs) {
+        const uint8_t *    base   = static_cast<const uint8_t *>(vbq);
+        const uint8_t *    qs     = base + ibx_offset.first;
+        const uint8_t *    scales = base + d_offset.first;
+        const ggml_half2 * dm     = reinterpret_cast<const ggml_half2 *>(base + d_offset.second);
+
+        const int bq8_offset   = QR2_K * (iqs / QI8_1);
+        const int scale_offset = iqs - iqs % QI8_1 + (iqs % QI8_1) / (QI8_1 / 2);
+
+        const int v = get_int_from_uint8_aligned(qs, iqs);
+
+        int   u[QR2_K];
+        float d8[QR2_K];
+
+#pragma unroll
+        for (int i = 0; i < QR2_K; ++i) {
+            const int8_t * quant_base_ptr = q8_1_quant_ptr + (bq8_offset + i) * QK8_1;
+            u[i]                          = get_int_from_int8_aligned(quant_base_ptr, iqs % QI8_1);
+            d8[i]                         = (*(q8_1_ds + bq8_offset + i))[0];
+        }
+
+        return vec_dot_q2_K_q8_1_impl_mmvq(v, u, scales + scale_offset, *dm, d8);
+    }
+};
+
 template <> struct reorder_vec_dot_q_sycl<GGML_TYPE_Q3_K> {
     static constexpr ggml_type gtype = GGML_TYPE_Q3_K;