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Atmosphere/stratosphere/sm/source/sm_tipc_server.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "sm_tipc_server.hpp"
#include "sm_user_service.hpp"
#include "sm_manager_service.hpp"
#include "sm_wait_list.hpp"
#include "impl/sm_service_manager.hpp"
namespace ams::sm {
namespace {
/* Server limit definitions. */
enum PortIndex : size_t {
PortIndex_Manager,
PortIndex_User,
PortIndex_Count,
};
constexpr inline size_t NumTipcPorts = static_cast<size_t>(PortIndex_Count);
constexpr inline size_t MaxSessionsManager = 1;
constexpr inline size_t MaxSessionsUser = 0x50 + 8 - MaxSessionsManager;
constexpr inline size_t MaxSessionsTotal = MaxSessionsManager + MaxSessionsUser;
static_assert(MaxSessionsTotal % NumTipcPorts == 0);
/* Define WaitList class. */
class WaitList {
public:
using Key = sm::ServiceName;
private:
struct Entry {
sm::ServiceName service_name{sm::InvalidServiceName};
tipc::WaitableObject object{};
u8 message_buffer[svc::ipc::MessageBufferSize];
};
private:
Entry m_entries[MaxSessionsTotal / NumTipcPorts]{};
Entry *m_processing_entry{};
public:
constexpr WaitList() = default;
public:
Result StartRegisterRetry(sm::ServiceName service_name) {
/* Check that we're not already processing a retry. */
AMS_ABORT_UNLESS(m_processing_entry == nullptr);
/* Find a free entry. */
Entry *free_entry = nullptr;
for (auto &entry : m_entries) {
if (entry.service_name == InvalidServiceName) {
free_entry = std::addressof(entry);
break;
}
}
/* Verify that we found a free entry. */
R_UNLESS(free_entry != nullptr, sm::ResultOutOfProcesses());
/* Populate the entry. */
free_entry->service_name = service_name;
std::memcpy(free_entry->message_buffer, svc::ipc::GetMessageBuffer(), util::size(free_entry->message_buffer));
/* Set the processing entry. */
m_processing_entry = free_entry;
/* Return the special request deferral result. */
return tipc::ResultRequestDeferred();
}
void ProcessRegisterRetry(tipc::WaitableObject &object) {
/* Verify that we have a processing entry. */
AMS_ABORT_UNLESS(m_processing_entry != nullptr);
/* Set the entry's object. */
m_processing_entry->object = object;
/* Clear our processing entry. */
m_processing_entry = nullptr;
}
bool TestResume(sm::ServiceName service_name) {
/* Check that we have a matching service name. */
for (const auto &entry : m_entries) {
if (entry.service_name == service_name) {
return true;
}
}
return false;
}
template<typename PortManagerType>
void Resume(sm::ServiceName service_name, PortManagerType *port_manager) {
/* Resume (and clear) all matching entries. */
for (auto &entry : m_entries) {
if (entry.service_name == service_name) {
/* Copy the saved message buffer. */
std::memcpy(svc::ipc::GetMessageBuffer(), entry.message_buffer, svc::ipc::MessageBufferSize);
/* Resume the request. */
R_TRY_CATCH(port_manager->ProcessRequest(entry.object)) {
R_CATCH(tipc::ResultRequestDeferred) {
this->ProcessRegisterRetry(entry.object);
}
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
/* Clear the entry's service name. */
entry.service_name = sm::InvalidServiceName;
}
}
}
};
/* Define port metadata. */
using UserPortMeta = tipc::PortMeta<MaxSessionsUser, impl::IUserInterface, UserService, tipc::SlabAllocator>;
using ManagerPortMeta = tipc::PortMeta<MaxSessionsManager, impl::IManagerInterface, ManagerService, tipc::SingletonAllocator>;
/* Define server manager global. */
using ServerManager = tipc::ServerManagerWithDeferral<sm::WaitList, ManagerPortMeta, UserPortMeta>;
ServerManager g_server_manager;
}
void InitializeTipcServer() {
/* Initialize the server manager. */
g_server_manager.Initialize();
/* Create the handles for our ports. */
svc::Handle user_port_handle = svc::InvalidHandle, manager_port_handle = svc::InvalidHandle;
{
/* Create the user port handle. */
R_ABORT_UNLESS(svc::ManageNamedPort(std::addressof(user_port_handle), "sm:", MaxSessionsUser));
/* Create the manager port handle. */
R_ABORT_UNLESS(impl::RegisterServiceForSelf(std::addressof(manager_port_handle), sm::ServiceName::Encode("sm:m"), MaxSessionsManager));
/* TODO: Debug Monitor port? */
}
/* Register the ports. */
g_server_manager.RegisterPort<PortIndex_Manager>(manager_port_handle);
g_server_manager.RegisterPort<PortIndex_User >(user_port_handle);
}
void LoopProcessTipcServer() {
/* Loop processing the server on all threads. */
g_server_manager.LoopAuto();
}
Result StartRegisterRetry(sm::ServiceName service_name) {
/* Get the port manager from where it's saved in TLS. */
auto *port_manager = reinterpret_cast<typename ServerManager::PortManagerBase *>(os::GetTlsValue(g_server_manager.GetTlsSlot()));
/* Register the retry. */
return port_manager->StartRegisterRetry(service_name);
}
void TriggerResume(sm::ServiceName service_name) {
/* Trigger a resumption. */
g_server_manager.TriggerResume(service_name);
}
}