llama : allow using iGPUs with --device (#15951)

* llama : allow using iGPUs with --device

* mtmd : allow iGPU

* rpc-server : allow iGPU

common/arg.cpp

@@ -1304,7 +1304,7 @@ static std::vector<ggml_backend_dev_t> parse_device_list(const std::string & val
     } else {
         for (const auto & device : dev_names) {
             auto * dev = ggml_backend_dev_by_name(device.c_str());
-            if (!dev || ggml_backend_dev_type(dev) != GGML_BACKEND_DEVICE_TYPE_GPU) {
+            if (!dev || ggml_backend_dev_type(dev) == GGML_BACKEND_DEVICE_TYPE_CPU) {
                 throw std::invalid_argument(string_format("invalid device: %s", device.c_str()));
             }
             devices.push_back(dev);
@@ -1314,7 +1314,7 @@ static std::vector<ggml_backend_dev_t> parse_device_list(const std::string & val
     return devices;
 }
 
-static void add_rpc_devices(std::string servers) {
+static void add_rpc_devices(const std::string & servers) {
     auto rpc_servers = string_split<std::string>(servers, ',');
     if (rpc_servers.empty()) {
         throw std::invalid_argument("no RPC servers specified");
@@ -2516,24 +2516,15 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
         {"--list-devices"},
         "print list of available devices and exit",
         [](common_params &) {
-            std::vector<ggml_backend_dev_t> rpc_devices;
-            std::vector<ggml_backend_dev_t> all_devices;
+            std::vector<ggml_backend_dev_t> devices;
             for (size_t i = 0; i < ggml_backend_dev_count(); ++i) {
                 auto * dev = ggml_backend_dev_get(i);
-                if (ggml_backend_dev_type(dev) == GGML_BACKEND_DEVICE_TYPE_GPU) {
-                    ggml_backend_reg_t reg = ggml_backend_dev_backend_reg(dev);
-                    if (ggml_backend_reg_name(reg) == std::string("RPC")) {
-                        rpc_devices.push_back(dev);
-                    } else {
-                        all_devices.push_back(dev);
-                    }
+                if (ggml_backend_dev_type(dev) != GGML_BACKEND_DEVICE_TYPE_CPU) {
+                    devices.push_back(dev);
                 }
             }
-            // insert RPC devices in front
-            all_devices.insert(all_devices.begin(), rpc_devices.begin(), rpc_devices.end());
             printf("Available devices:\n");
-            for (size_t i = 0; i < all_devices.size(); ++i) {
-                auto * dev = all_devices[i];
+            for (auto * dev : devices) {
                 size_t free, total;
                 ggml_backend_dev_memory(dev, &free, &total);
                 printf("  %s: %s (%zu MiB, %zu MiB free)\n", ggml_backend_dev_name(dev), ggml_backend_dev_description(dev), total / 1024 / 1024, free / 1024 / 1024);

tools/mtmd/clip.cpp

@@ -406,6 +406,7 @@ struct clip_ctx {
             }
             if (!backend) {
                 backend = ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_GPU, nullptr);
+                backend = backend ? backend : ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_IGPU, nullptr);
             }
         }
 

tools/rpc/rpc-server.cpp

@@ -227,15 +227,7 @@ static ggml_backend_t create_backend(const rpc_server_params & params) {
         }
     }
 
-    // try to initialize a GPU backend first
-    if (!backend) {
-        backend = ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_GPU, nullptr);
-    }
-
-    // if there aren't GPU backends fallback to CPU backend
-    if (!backend) {
-        backend = ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_CPU, nullptr);
-    }
+    backend = ggml_backend_init_best();
 
     if (backend) {
         fprintf(stderr, "%s: using %s backend\n", __func__, ggml_backend_name(backend));