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

2026-01-28 17:49:40 +08:00
parent 6ad70c5a77
commit b7feacf7f3
47 changed files with 4711 additions and 0 deletions
@@ -0,0 +1,148 @@
+#include "backend-dispatched.h"
+#include "backend-virgl-apir.h"
+#include "ggml-backend-impl.h"
+#include "ggml-backend.h"
+#include "ggml-impl.h"
+
+#include <cstdint>
+
+uint32_t backend_device_get_device_count(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    int32_t dev_count = reg->iface.get_device_count(reg);
+    apir_encode_int32_t(enc, &dev_count);
+
+    return 0;
+}
+
+uint32_t backend_device_get_count(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    int32_t dev_count = reg->iface.get_device_count(reg);
+    apir_encode_int32_t(enc, &dev_count);
+
+    return 0;
+}
+
+uint32_t backend_device_get_name(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    const char * string = dev->iface.get_name(dev);
+
+    const size_t string_size = strlen(string) + 1;
+    apir_encode_array_size(enc, string_size);
+    apir_encode_char_array(enc, string, string_size);
+
+    return 0;
+}
+
+uint32_t backend_device_get_description(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    const char * string = dev->iface.get_description(dev);
+
+    const size_t string_size = strlen(string) + 1;
+    apir_encode_array_size(enc, string_size);
+    apir_encode_char_array(enc, string, string_size);
+
+    return 0;
+}
+
+uint32_t backend_device_get_type(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    uint32_t type = dev->iface.get_type(dev);
+    apir_encode_uint32_t(enc, &type);
+
+    return 0;
+}
+
+uint32_t backend_device_get_memory(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    size_t free, total;
+    dev->iface.get_memory(dev, &free, &total);
+
+    apir_encode_size_t(enc, &free);
+    apir_encode_size_t(enc, &total);
+
+    return 0;
+}
+
+uint32_t backend_device_supports_op(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+
+    const ggml_tensor * op = apir_decode_ggml_tensor_inplace(dec);
+
+    bool supports_op = dev->iface.supports_op(dev, op);
+
+    apir_encode_bool_t(enc, &supports_op);
+
+    return 0;
+}
+
+uint32_t backend_device_get_buffer_type(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    ggml_backend_buffer_type_t bufft = dev->iface.get_buffer_type(dev);
+
+    apir_encode_ggml_buffer_type(enc, bufft);
+
+    return 0;
+}
+
+uint32_t backend_device_get_props(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    ggml_backend_dev_props props;
+    dev->iface.get_props(dev, &props);
+
+    apir_encode_bool_t(enc, &props.caps.async);
+    apir_encode_bool_t(enc, &props.caps.host_buffer);
+    apir_encode_bool_t(enc, &props.caps.buffer_from_host_ptr);
+    apir_encode_bool_t(enc, &props.caps.events);
+
+    return 0;
+}
+
+uint32_t backend_device_buffer_from_ptr(apir_encoder * enc, apir_decoder * dec, virgl_apir_context * ctx) {
+    GGML_UNUSED(ctx);
+    GGML_UNUSED(dec);
+
+    uint32_t shmem_res_id;
+    apir_decode_virtgpu_shmem_res_id(dec, &shmem_res_id);
+
+    void * shmem_ptr = ctx->iface->get_shmem_ptr(ctx->ctx_id, shmem_res_id);
+    if (!shmem_ptr) {
+        GGML_LOG_ERROR("Couldn't get the shmem addr from virgl\n");
+        apir_decoder_set_fatal(dec);
+        return 1;
+    }
+
+    size_t size;
+    apir_decode_size_t(dec, &size);
+    size_t max_tensor_size;
+    apir_decode_size_t(dec, &max_tensor_size);
+
+    ggml_backend_buffer_t buffer;
+    buffer = dev->iface.buffer_from_host_ptr(dev, shmem_ptr, size, max_tensor_size);
+
+    apir_encode_ggml_buffer(enc, buffer);
+    apir_encode_ggml_buffer_type(enc, buffer->buft);
+
+    if (buffer) {
+        apir_track_backend_buffer(buffer);
+    }
+
+    return 0;
+}