From 9b0e7052fbd0b8dd5e7010ce4c952b033fbbd221 Mon Sep 17 00:00:00 2001
From: Lumpiasty <arek.dzski@gmail.com>
Date: Wed, 15 Jul 2026 01:57:07 +0200
Subject: [PATCH] tmp: diagnostics for register_host pinning path

---
 ggml/src/ggml-vulkan/ggml-vulkan.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ggml/src/ggml-vulkan/ggml-vulkan.cpp b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
index c1e89b78c..a172d4ed4 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
@@ -3173,6 +3173,7 @@ static vk_buffer ggml_vk_create_buffer(vk_device& device, size_t size, const std
             import_info.setPNext(&mem_flags_info);
             buf->device_memory = device->device.allocateMemory({ size, memory_type_idx, &import_info });
         } catch (const vk::SystemError& e) {
+            fprintf(stderr, "PROBE import allocateMemory threw: %s\n", e.what());
         }
     } else {
         for (auto it = req_flags_list.begin(); it != req_flags_list.end(); it++) {
@@ -17812,14 +17813,17 @@ static void ggml_backend_vk_device_event_synchronize(ggml_backend_dev_t dev, ggm
 
 static vk_buffer ggml_vk_buffer_from_host_ptr(vk_device & device, void * ptr, size_t size) {
     if (!device->external_memory_host) {
+        fprintf(stderr, "PROBE from_host_ptr: ext_mem_host disabled\n");
         return {};
     }
 
     uintptr_t uptr = reinterpret_cast<uintptr_t>(ptr);
     if (uptr & (device->min_imported_host_pointer_alignment - 1)) {
+        fprintf(stderr, "PROBE from_host_ptr: ptr %p not aligned to %zu\n", ptr, device->min_imported_host_pointer_alignment);
         return {};
     }
     if (size & (device->min_imported_host_pointer_alignment - 1)) {
+        fprintf(stderr, "PROBE from_host_ptr: size %zu not aligned to %zu\n", size, device->min_imported_host_pointer_alignment);
         return {};
     }
 
@@ -17829,9 +17833,10 @@ static vk_buffer ggml_vk_buffer_from_host_ptr(vk_device & device, void * ptr, si
     try {
         buf = ggml_vk_create_buffer(device, size, { property_flags }, ptr);
     } catch (vk::SystemError& e) {
-        GGML_LOG_WARN("ggml_vulkan: Failed ggml_vk_create_buffer (%s)\n", e.what());
+        fprintf(stderr, "PROBE from_host_ptr: create_buffer threw (%s)\n", e.what());
     }
 
+    fprintf(stderr, "PROBE from_host_ptr: ptr=%p size=%zu -> buf=%p buf->buffer=%p\n", ptr, size, buf.get(), buf ? (void*)buf->buffer.operator VkBuffer() : nullptr);
     return buf;
 }
 
@@ -17923,6 +17928,8 @@ static ggml_backend_dev_t ggml_backend_vk_reg_get_device(ggml_backend_reg_t reg,
 // GGML_CUDA_REGISTER_HOST path; populates device->pinned_memory, which the
 // existing pinned fast path in ggml_vk_buffer_write_2d_async looks up.
 static bool ggml_backend_vk_register_host_buffer(void * buffer, size_t size) {
+    fprintf(stderr, "PROBE register_host CALLED buffer=%p size=%zu cuda_env=%d vk_env=%d\n", buffer, size,
+            getenv("GGML_CUDA_REGISTER_HOST") != nullptr, getenv("GGML_VK_REGISTER_HOST") != nullptr);
     if (getenv("GGML_CUDA_REGISTER_HOST") == nullptr && getenv("GGML_VK_REGISTER_HOST") == nullptr) {
         return false;
     }