ggml: new backend for Virglrenderer API Remoting acceleration (v2) (#18718)

2026-01-28 10:49:40 +01:00
parent 6ad70c5a77
commit b7feacf7f3
47 changed files with 4711 additions and 0 deletions
@@ -0,0 +1,144 @@
+#include "ggml-remoting.h"
+
+static const char * ggml_backend_remoting_device_get_name(ggml_backend_dev_t dev) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    return apir_device_get_name(gpu);
+}
+
+static const char * ggml_backend_remoting_device_get_description(ggml_backend_dev_t dev) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    return apir_device_get_description(gpu);
+}
+
+static enum ggml_backend_dev_type ggml_backend_remoting_device_get_type(ggml_backend_dev_t dev) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    static enum ggml_backend_dev_type type;
+    static bool                       has_type = false;
+    if (!has_type) {
+        has_type = true;
+        type     = (enum ggml_backend_dev_type) apir_device_get_type(gpu);
+    }
+
+    return type;
+}
+
+static void ggml_backend_remoting_device_get_memory(ggml_backend_dev_t dev, size_t * free, size_t * total) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    return apir_device_get_memory(gpu, free, total);
+}
+
+static bool ggml_backend_remoting_device_supports_op(ggml_backend_dev_t dev, const ggml_tensor * op) {
+#if USE_ALWAYS_TRUE_SUPPORTS_OP == 1
+    /* ggml-rpc cheats it like this */
+    /* with the current implementation of serialize_tensor, the src/view aren't properly passed */
+    UNUSED(dev);
+    UNUSED(op);
+
+    return true;
+#else
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    return apir_device_supports_op(gpu, op);
+#endif
+}
+
+static bool ggml_backend_remoting_device_supports_buft(ggml_backend_dev_t dev, ggml_backend_buffer_type_t buft) {
+    bool supported = buft->device == dev;
+
+    return supported;
+}
+
+static bool ggml_backend_remoting_device_offload_op(ggml_backend_dev_t dev, const ggml_tensor * op) {
+    UNUSED(dev);
+    UNUSED(op);
+
+    return false;
+}
+
+static void ggml_backend_remoting_device_get_props(ggml_backend_dev_t dev, ggml_backend_dev_props * props) {
+    props->name        = ggml_backend_remoting_device_get_name(dev);
+    props->description = ggml_backend_remoting_device_get_description(dev);
+    props->type        = ggml_backend_remoting_device_get_type(dev);
+    ggml_backend_remoting_device_get_memory(dev, &props->memory_free, &props->memory_total);
+
+    virtgpu * gpu = DEV_TO_GPU(dev);
+    apir_device_get_props(gpu, &props->caps.async, &props->caps.host_buffer, &props->caps.buffer_from_host_ptr,
+                          &props->caps.events);
+
+    props->caps.buffer_from_host_ptr = false;
+    props->caps.async                = false;
+    props->caps.events               = false;
+}
+
+ggml_backend_buffer_type_t ggml_backend_remoting_device_get_buffer_type(ggml_backend_dev_t dev) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    apir_buffer_type_host_handle_t ctx = apir_device_get_buffer_type(gpu);
+
+    static ggml_backend_buffer_type buft{
+        /* .iface    = */ ggml_backend_remoting_buffer_type_interface,
+        /* .device   = */ dev,
+        /* .context  = */ (void *) ctx,
+    };
+
+    return &buft;
+}
+
+static ggml_backend_buffer_type_t ggml_backend_remoting_device_get_buffer_from_ptr_type(ggml_backend_dev_t dev) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    apir_buffer_type_host_handle_t ctx = apir_device_get_buffer_type(gpu);
+
+    static ggml_backend_buffer_type buft{
+        /* .iface    = */ ggml_backend_remoting_buffer_from_ptr_type_interface,
+        /* .device   = */ dev,
+        /* .context  = */ (void *) ctx,
+    };
+
+    return &buft;
+}
+
+static ggml_backend_buffer_t ggml_backend_remoting_device_buffer_from_ptr(ggml_backend_dev_t dev,
+                                                                          void *             ptr,
+                                                                          size_t             size,
+                                                                          size_t             max_tensor_size) {
+    virtgpu * gpu = DEV_TO_GPU(dev);
+
+    ggml_backend_remoting_buffer_context * context = (ggml_backend_remoting_buffer_context *) malloc(sizeof(*context));
+    if (!context) {
+        GGML_ABORT("Couldn't allocate the buffer context ...");
+    }
+
+    context->gpu          = gpu;
+    context->apir_context = apir_device_buffer_from_ptr(gpu, size, max_tensor_size);
+    context->base         = ptr;
+    context->is_from_ptr  = true;
+
+    ggml_backend_buffer_t buffer =
+        ggml_backend_buffer_init(ggml_backend_remoting_device_get_buffer_from_ptr_type(dev),
+                                 ggml_backend_remoting_buffer_from_ptr_interface, (void *) context, size);
+
+    return buffer;
+}
+
+const ggml_backend_device_i ggml_backend_remoting_device_interface = {
+    /* .get_name             = */ ggml_backend_remoting_device_get_name,
+    /* .get_description      = */ ggml_backend_remoting_device_get_description,
+    /* .get_memory           = */ ggml_backend_remoting_device_get_memory,
+    /* .get_type             = */ ggml_backend_remoting_device_get_type,
+    /* .get_props            = */ ggml_backend_remoting_device_get_props,
+    /* .init_backend         = */ ggml_backend_remoting_device_init,
+    /* .get_buffer_type      = */ ggml_backend_remoting_device_get_buffer_type,
+    /* .get_host_buffer_type = */ NULL,
+    /* .buffer_from_host_ptr = */ ggml_backend_remoting_device_buffer_from_ptr,
+    /* .supports_op          = */ ggml_backend_remoting_device_supports_op,
+    /* .supports_buft        = */ ggml_backend_remoting_device_supports_buft,
+    /* .offload_op           = */ ggml_backend_remoting_device_offload_op,
+    /* .event_new            = */ NULL,
+    /* .event_free           = */ NULL,
+    /* .event_synchronize    = */ NULL,
+};