From 95a05ed4da3e093c04bce431b6d9269da1ccaaba Mon Sep 17 00:00:00 2001
From: Jiwoong Song <55657581+jwsong98@users.noreply.github.com>
Date: Fri, 2 Oct 2026 17:13:20 +0900
Subject: [PATCH] vulkan: disable large matmul tile on Samsung GPUs with 32KB
 shared memory (llama/28531)

Assisted-by: Claude Opus
---
 ggml/src/ggml-vulkan/ggml-vulkan-types.h | 3 ++-
 ggml/src/ggml-vulkan/ggml-vulkan.cpp     | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/ggml/src/ggml-vulkan/ggml-vulkan-types.h b/ggml/src/ggml-vulkan/ggml-vulkan-types.h
index ee50f51a3..4158ff779 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan-types.h
+++ b/ggml/src/ggml-vulkan/ggml-vulkan-types.h
@@ -209,6 +209,8 @@ static bool is_pow2(uint32_t x) { return x > 1 && (x & (x-1)) == 0; }
 
 #define VK_VENDOR_ID_QUALCOMM 0x5143
 
+#define VK_VENDOR_ID_SAMSUNG 0x144d
+
 #define VK_DEVICE_DESCRIPTOR_POOL_SIZE 256
 
 #define VK_CHECK(err, msg, dev)                                     \
@@ -1451,4 +1453,3 @@ struct ggml_backend_vk_device_context {
     std::string pci_bus_id;
     int op_offload_min_batch_size;
 };
-
diff --git a/ggml/src/ggml-vulkan/ggml-vulkan.cpp b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
index a45d5e1f0..033c11741 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
@@ -4823,6 +4823,14 @@ vk_device ggml_vk_get_device(size_t idx) {
                 device->mul_mat_id_m[i] = true;
                 device->mul_mat_id_s[i] = !device->coopmat_support;
                 break;
+            case VK_VENDOR_ID_SAMSUNG:
+                device->mul_mat_l[i] = false;
+                device->mul_mat_m[i] = true;
+                device->mul_mat_s[i] = true;
+                device->mul_mat_id_l[i] = false;
+                device->mul_mat_id_m[i] = true;
+                device->mul_mat_id_s[i] = true;
+                break;
 #endif
             default:
                 device->mul_mat_l[i] = true;