hle: service: Add a helper module for managing kernel objects.

src/core/CMakeLists.txt

@@ -517,6 +517,8 @@ add_library(core STATIC
     hle/service/psc/psc.h
     hle/service/ptm/psm.cpp
     hle/service/ptm/psm.h
+    hle/service/kernel_helpers.cpp
+    hle/service/kernel_helpers.h
     hle/service/service.cpp
     hle/service/service.h
     hle/service/set/set.cpp

src/core/hle/service/hid/controllers/npad.cpp

@@ -18,6 +18,7 @@
 #include "core/hle/kernel/k_writable_event.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/service/hid/controllers/npad.h"
+#include "core/hle/service/kernel_helpers.h"
 
 namespace Service::HID {
 constexpr s32 HID_JOYSTICK_MAX = 0x7fff;
@@ -147,7 +148,9 @@ bool Controller_NPad::IsDeviceHandleValid(const DeviceHandle& device_handle) {
            device_handle.device_index < DeviceIndex::MaxDeviceIndex;
 }
 
-Controller_NPad::Controller_NPad(Core::System& system_) : ControllerBase{system_} {
+Controller_NPad::Controller_NPad(Core::System& system_,
+                                 KernelHelpers::ServiceContext& service_context_)
+    : ControllerBase{system_}, service_context{service_context_} {
     latest_vibration_values.fill({DEFAULT_VIBRATION_VALUE, DEFAULT_VIBRATION_VALUE});
 }
 
@@ -253,8 +256,8 @@ void Controller_NPad::InitNewlyAddedController(std::size_t controller_idx) {
 void Controller_NPad::OnInit() {
     auto& kernel = system.Kernel();
     for (std::size_t i = 0; i < styleset_changed_events.size(); ++i) {
-        styleset_changed_events[i] = Kernel::KEvent::Create(kernel);
-        styleset_changed_events[i]->Initialize(fmt::format("npad:NpadStyleSetChanged_{}", i));
+        styleset_changed_events[i] =
+            service_context.CreateEvent(fmt::format("npad:NpadStyleSetChanged_{}", i));
     }
 
     if (!IsControllerActivated()) {
@@ -344,8 +347,7 @@ void Controller_NPad::OnRelease() {
     }
 
     for (std::size_t i = 0; i < styleset_changed_events.size(); ++i) {
-        styleset_changed_events[i]->Close();
-        styleset_changed_events[i] = nullptr;
+        service_context.CloseEvent(styleset_changed_events[i]);
     }
 }
 

src/core/hle/service/hid/controllers/npad.h

@@ -20,6 +20,10 @@ class KEvent;
 class KReadableEvent;
 } // namespace Kernel
 
+namespace Service::KernelHelpers {
+class ServiceContext;
+}
+
 namespace Service::HID {
 
 constexpr u32 NPAD_HANDHELD = 32;
@@ -27,7 +31,8 @@ constexpr u32 NPAD_UNKNOWN = 16; // TODO(ogniK): What is this?
 
 class Controller_NPad final : public ControllerBase {
 public:
-    explicit Controller_NPad(Core::System& system_);
+    explicit Controller_NPad(Core::System& system_,
+                             KernelHelpers::ServiceContext& service_context_);
     ~Controller_NPad() override;
 
     // Called when the controller is initialized
@@ -566,6 +571,7 @@ private:
         std::array<std::unique_ptr<Input::MotionDevice>, Settings::NativeMotion::NUM_MOTIONS_HID>,
         10>;
 
+    KernelHelpers::ServiceContext& service_context;
     std::mutex mutex;
     ButtonArray buttons;
     StickArray sticks;

src/core/hle/service/hid/hid.cpp

@@ -46,8 +46,9 @@ constexpr auto pad_update_ns = std::chrono::nanoseconds{1000 * 1000};         //
 constexpr auto motion_update_ns = std::chrono::nanoseconds{15 * 1000 * 1000}; // (15ms, 66.666Hz)
 constexpr std::size_t SHARED_MEMORY_SIZE = 0x40000;
 
-IAppletResource::IAppletResource(Core::System& system_)
-    : ServiceFramework{system_, "IAppletResource"} {
+IAppletResource::IAppletResource(Core::System& system_,
+                                 KernelHelpers::ServiceContext& service_context_)
+    : ServiceFramework{system_, "IAppletResource"}, service_context{service_context_} {
     static const FunctionInfo functions[] = {
         {0, &IAppletResource::GetSharedMemoryHandle, "GetSharedMemoryHandle"},
     };
@@ -63,7 +64,7 @@ IAppletResource::IAppletResource(Core::System& system_)
     MakeController<Controller_Stubbed>(HidController::CaptureButton);
     MakeController<Controller_Stubbed>(HidController::InputDetector);
     MakeController<Controller_Stubbed>(HidController::UniquePad);
-    MakeController<Controller_NPad>(HidController::NPad);
+    MakeControllerWithServiceContext<Controller_NPad>(HidController::NPad);
     MakeController<Controller_Gesture>(HidController::Gesture);
     MakeController<Controller_ConsoleSixAxis>(HidController::ConsoleSixAxisSensor);
 
@@ -191,13 +192,14 @@ private:
 
 std::shared_ptr<IAppletResource> Hid::GetAppletResource() {
     if (applet_resource == nullptr) {
-        applet_resource = std::make_shared<IAppletResource>(system);
+        applet_resource = std::make_shared<IAppletResource>(system, service_context);
     }
 
     return applet_resource;
 }
 
-Hid::Hid(Core::System& system_) : ServiceFramework{system_, "hid"} {
+Hid::Hid(Core::System& system_)
+    : ServiceFramework{system_, "hid"}, service_context{system_, service_name} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, &Hid::CreateAppletResource, "CreateAppletResource"},
@@ -347,7 +349,7 @@ void Hid::CreateAppletResource(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_HID, "called, applet_resource_user_id={}", applet_resource_user_id);
 
     if (applet_resource == nullptr) {
-        applet_resource = std::make_shared<IAppletResource>(system);
+        applet_resource = std::make_shared<IAppletResource>(system, service_context);
     }
 
     IPC::ResponseBuilder rb{ctx, 2, 0, 1};

src/core/hle/service/hid/hid.h

@@ -7,6 +7,7 @@
 #include <chrono>
 
 #include "core/hle/service/hid/controllers/controller_base.h"
+#include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/service.h"
 
 namespace Core::Timing {
@@ -39,7 +40,8 @@ enum class HidController : std::size_t {
 
 class IAppletResource final : public ServiceFramework<IAppletResource> {
 public:
-    explicit IAppletResource(Core::System& system_);
+    explicit IAppletResource(Core::System& system_,
+                             KernelHelpers::ServiceContext& service_context_);
     ~IAppletResource() override;
 
     void ActivateController(HidController controller);
@@ -60,11 +62,18 @@ private:
     void MakeController(HidController controller) {
         controllers[static_cast<std::size_t>(controller)] = std::make_unique<T>(system);
     }
+    template <typename T>
+    void MakeControllerWithServiceContext(HidController controller) {
+        controllers[static_cast<std::size_t>(controller)] =
+            std::make_unique<T>(system, service_context);
+    }
 
     void GetSharedMemoryHandle(Kernel::HLERequestContext& ctx);
     void UpdateControllers(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
     void UpdateMotion(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
 
+    KernelHelpers::ServiceContext& service_context;
+
     std::shared_ptr<Core::Timing::EventType> pad_update_event;
     std::shared_ptr<Core::Timing::EventType> motion_update_event;
 
@@ -176,6 +185,8 @@ private:
     static_assert(sizeof(VibrationDeviceInfo) == 0x8, "VibrationDeviceInfo has incorrect size.");
 
     std::shared_ptr<IAppletResource> applet_resource;
+
+    KernelHelpers::ServiceContext service_context;
 };
 
 /// Reload input devices. Used when input configuration changed

src/core/hle/service/kernel_helpers.cpp

@@ -0,0 +1,64 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/core.h"
+#include "core/hle/kernel/k_event.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_readable_event.h"
+#include "core/hle/kernel/k_resource_limit.h"
+#include "core/hle/kernel/k_scoped_resource_reservation.h"
+#include "core/hle/kernel/k_writable_event.h"
+#include "core/hle/service/kernel_helpers.h"
+
+namespace Service::KernelHelpers {
+
+ServiceContext::ServiceContext(Core::System& system_, std::string name_)
+    : kernel(system_.Kernel()) {
+    process = Kernel::KProcess::Create(kernel);
+    ASSERT(Kernel::KProcess::Initialize(process, system_, std::move(name_),
+                                        Kernel::KProcess::ProcessType::Userland)
+               .IsSuccess());
+}
+
+ServiceContext::~ServiceContext() {
+    process->Close();
+    process = nullptr;
+}
+
+Kernel::KEvent* ServiceContext::CreateEvent(std::string&& name) {
+    // Reserve a new event from the process resource limit
+    Kernel::KScopedResourceReservation event_reservation(process,
+                                                         Kernel::LimitableResource::Events);
+    if (!event_reservation.Succeeded()) {
+        LOG_CRITICAL(Service, "Resource limit reached!");
+        return {};
+    }
+
+    // Create a new event.
+    auto* event = Kernel::KEvent::Create(kernel);
+    if (!event) {
+        LOG_CRITICAL(Service, "Unable to create event!");
+        return {};
+    }
+
+    // Initialize the event.
+    event->Initialize(std::move(name));
+
+    // Commit the thread reservation.
+    event_reservation.Commit();
+
+    // Register the event.
+    Kernel::KEvent::Register(kernel, event);
+
+    return event;
+}
+
+void ServiceContext::CloseEvent(Kernel::KEvent* event) {
+    event->GetReadableEvent().Close();
+    event->GetWritableEvent().Close();
+}
+
+} // namespace Service::KernelHelpers

src/core/hle/service/kernel_helpers.h

@@ -0,0 +1,35 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+namespace Core {
+class System;
+}
+
+namespace Kernel {
+class KernelCore;
+class KEvent;
+class KProcess;
+} // namespace Kernel
+
+namespace Service::KernelHelpers {
+
+class ServiceContext {
+public:
+    ServiceContext(Core::System& system_, std::string name_);
+    ~ServiceContext();
+
+    Kernel::KEvent* CreateEvent(std::string&& name);
+
+    void CloseEvent(Kernel::KEvent* event);
+
+private:
+    Kernel::KernelCore& kernel;
+    Kernel::KProcess* process{};
+};
+
+} // namespace Service::KernelHelpers

src/core/hle/service/nvdrv/nvdrv.cpp

@@ -39,11 +39,12 @@ void InstallInterfaces(SM::ServiceManager& service_manager, NVFlinger::NVFlinger
     nvflinger.SetNVDrvInstance(module_);
 }
 
-Module::Module(Core::System& system) : syncpoint_manager{system.GPU()} {
+Module::Module(Core::System& system)
+    : syncpoint_manager{system.GPU()}, service_context{system, "nvdrv"} {
     auto& kernel = system.Kernel();
     for (u32 i = 0; i < MaxNvEvents; i++) {
-        events_interface.events[i].event = Kernel::KEvent::Create(kernel);
-        events_interface.events[i].event->Initialize(fmt::format("NVDRV::NvEvent_{}", i));
+        events_interface.events[i].event =
+            service_context.CreateEvent(fmt::format("NVDRV::NvEvent_{}", i));
         events_interface.status[i] = EventState::Free;
         events_interface.registered[i] = false;
     }
@@ -65,8 +66,7 @@ Module::Module(Core::System& system) : syncpoint_manager{system.GPU()} {
 
 Module::~Module() {
     for (u32 i = 0; i < MaxNvEvents; i++) {
-        events_interface.events[i].event->Close();
-        events_interface.events[i].event = nullptr;
+        service_context.CloseEvent(events_interface.events[i].event);
     }
 }
 

src/core/hle/service/nvdrv/nvdrv.h

@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "common/common_types.h"
+#include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/nvdrv/nvdata.h"
 #include "core/hle/service/nvdrv/syncpoint_manager.h"
 #include "core/hle/service/service.h"
@@ -154,6 +155,8 @@ private:
     std::unordered_map<std::string, std::shared_ptr<Devices::nvdevice>> devices;
 
     EventInterface events_interface;
+
+    KernelHelpers::ServiceContext service_context;
 };
 
 /// Registers all NVDRV services with the specified service manager.

src/core/hle/service/service.h

@@ -96,6 +96,9 @@ protected:
     /// System context that the service operates under.
     Core::System& system;
 
+    /// Identifier string used to connect to the service.
+    std::string service_name;
+
 private:
     template <typename T>
     friend class ServiceFramework;
@@ -117,8 +120,6 @@ private:
     void RegisterHandlersBaseTipc(const FunctionInfoBase* functions, std::size_t n);
     void ReportUnimplementedFunction(Kernel::HLERequestContext& ctx, const FunctionInfoBase* info);
 
-    /// Identifier string used to connect to the service.
-    std::string service_name;
     /// Maximum number of concurrent sessions that this service can handle.
     u32 max_sessions;