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fbb82e61e3
There's no real need to use a shared lifetime here, since we don't actually expose them to anything else. This is also kind of an unnecessary use of the heap given the objects themselves are so small; small enough, in fact that changing over to optionals actually reduces the overall size of the HLERequestContext struct (818 bytes to 808 bytes).
210 lines
8.6 KiB
C++
210 lines
8.6 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <tuple>
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#include <utility>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "core/core.h"
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#include "core/hle/ipc_helpers.h"
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#include "core/hle/kernel/client_port.h"
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#include "core/hle/kernel/client_session.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/server_session.h"
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#include "core/hle/kernel/session.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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ServerSession::ServerSession(KernelCore& kernel) : WaitObject{kernel} {}
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ServerSession::~ServerSession() {
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// This destructor will be called automatically when the last ServerSession handle is closed by
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// the emulated application.
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// Decrease the port's connection count.
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if (parent->port)
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parent->port->ConnectionClosed();
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// TODO(Subv): Wake up all the ClientSession's waiting threads and set
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// the SendSyncRequest result to 0xC920181A.
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parent->server = nullptr;
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}
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ResultVal<SharedPtr<ServerSession>> ServerSession::Create(KernelCore& kernel, std::string name) {
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SharedPtr<ServerSession> server_session(new ServerSession(kernel));
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server_session->name = std::move(name);
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server_session->parent = nullptr;
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return MakeResult(std::move(server_session));
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}
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bool ServerSession::ShouldWait(Thread* thread) const {
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// Closed sessions should never wait, an error will be returned from svcReplyAndReceive.
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if (parent->client == nullptr)
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return false;
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// Wait if we have no pending requests, or if we're currently handling a request.
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return pending_requesting_threads.empty() || currently_handling != nullptr;
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}
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void ServerSession::Acquire(Thread* thread) {
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ASSERT_MSG(!ShouldWait(thread), "object unavailable!");
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// We are now handling a request, pop it from the stack.
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// TODO(Subv): What happens if the client endpoint is closed before any requests are made?
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ASSERT(!pending_requesting_threads.empty());
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currently_handling = pending_requesting_threads.back();
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pending_requesting_threads.pop_back();
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}
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void ServerSession::ClientDisconnected() {
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// We keep a shared pointer to the hle handler to keep it alive throughout
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// the call to ClientDisconnected, as ClientDisconnected invalidates the
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// hle_handler member itself during the course of the function executing.
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std::shared_ptr<SessionRequestHandler> handler = hle_handler;
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if (handler) {
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// Note that after this returns, this server session's hle_handler is
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// invalidated (set to null).
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handler->ClientDisconnected(this);
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}
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// TODO(Subv): Force a wake up of all the ServerSession's waiting threads and set
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// their WaitSynchronization result to 0xC920181A.
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// Clean up the list of client threads with pending requests, they are unneeded now that the
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// client endpoint is closed.
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pending_requesting_threads.clear();
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currently_handling = nullptr;
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}
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void ServerSession::AppendDomainRequestHandler(std::shared_ptr<SessionRequestHandler> handler) {
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domain_request_handlers.push_back(std::move(handler));
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}
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std::size_t ServerSession::NumDomainRequestHandlers() const {
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return domain_request_handlers.size();
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}
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ResultCode ServerSession::HandleDomainSyncRequest(Kernel::HLERequestContext& context) {
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if (!context.HasDomainMessageHeader()) {
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return RESULT_SUCCESS;
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}
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// Set domain handlers in HLE context, used for domain objects (IPC interfaces) as inputs
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context.SetDomainRequestHandlers(domain_request_handlers);
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// If there is a DomainMessageHeader, then this is CommandType "Request"
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const auto& domain_message_header = context.GetDomainMessageHeader();
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const u32 object_id{domain_message_header.object_id};
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switch (domain_message_header.command) {
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case IPC::DomainMessageHeader::CommandType::SendMessage:
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if (object_id > domain_request_handlers.size()) {
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LOG_CRITICAL(IPC,
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"object_id {} is too big! This probably means a recent service call "
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"to {} needed to return a new interface!",
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object_id, name);
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UNREACHABLE();
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return RESULT_SUCCESS; // Ignore error if asserts are off
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}
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return domain_request_handlers[object_id - 1]->HandleSyncRequest(context);
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case IPC::DomainMessageHeader::CommandType::CloseVirtualHandle: {
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LOG_DEBUG(IPC, "CloseVirtualHandle, object_id=0x{:08X}", object_id);
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domain_request_handlers[object_id - 1] = nullptr;
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IPC::ResponseBuilder rb{context, 2};
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rb.Push(RESULT_SUCCESS);
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return RESULT_SUCCESS;
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}
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}
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LOG_CRITICAL(IPC, "Unknown domain command={}",
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static_cast<int>(domain_message_header.command.Value()));
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ASSERT(false);
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return RESULT_SUCCESS;
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}
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ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
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// The ServerSession received a sync request, this means that there's new data available
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// from its ClientSession, so wake up any threads that may be waiting on a svcReplyAndReceive or
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// similar.
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Kernel::HLERequestContext context(this);
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u32* cmd_buf = (u32*)Memory::GetPointer(thread->GetTLSAddress());
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context.PopulateFromIncomingCommandBuffer(kernel.CurrentProcess()->GetHandleTable(), cmd_buf);
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ResultCode result = RESULT_SUCCESS;
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// If the session has been converted to a domain, handle the domain request
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if (IsDomain() && context.HasDomainMessageHeader()) {
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result = HandleDomainSyncRequest(context);
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// If there is no domain header, the regular session handler is used
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} else if (hle_handler != nullptr) {
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// If this ServerSession has an associated HLE handler, forward the request to it.
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result = hle_handler->HandleSyncRequest(context);
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}
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if (thread->GetStatus() == ThreadStatus::Running) {
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// Put the thread to sleep until the server replies, it will be awoken in
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// svcReplyAndReceive for LLE servers.
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thread->SetStatus(ThreadStatus::WaitIPC);
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if (hle_handler != nullptr) {
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// For HLE services, we put the request threads to sleep for a short duration to
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// simulate IPC overhead, but only if the HLE handler didn't put the thread to sleep for
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// other reasons like an async callback. The IPC overhead is needed to prevent
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// starvation when a thread only does sync requests to HLE services while a
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// lower-priority thread is waiting to run.
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// This delay was approximated in a homebrew application by measuring the average time
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// it takes for svcSendSyncRequest to return when performing the SetLcdForceBlack IPC
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// request to the GSP:GPU service in a n3DS with firmware 11.6. The measured values have
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// a high variance and vary between models.
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static constexpr u64 IPCDelayNanoseconds = 39000;
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thread->WakeAfterDelay(IPCDelayNanoseconds);
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} else {
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// Add the thread to the list of threads that have issued a sync request with this
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// server.
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pending_requesting_threads.push_back(std::move(thread));
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}
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}
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// If this ServerSession does not have an HLE implementation, just wake up the threads waiting
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// on it.
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WakeupAllWaitingThreads();
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// Handle scenario when ConvertToDomain command was issued, as we must do the conversion at the
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// end of the command such that only commands following this one are handled as domains
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if (convert_to_domain) {
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ASSERT_MSG(IsSession(), "ServerSession is already a domain instance.");
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domain_request_handlers = {hle_handler};
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convert_to_domain = false;
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}
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return result;
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}
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ServerSession::SessionPair ServerSession::CreateSessionPair(KernelCore& kernel,
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const std::string& name,
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SharedPtr<ClientPort> port) {
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auto server_session = ServerSession::Create(kernel, name + "_Server").Unwrap();
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SharedPtr<ClientSession> client_session(new ClientSession(kernel));
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client_session->name = name + "_Client";
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std::shared_ptr<Session> parent(new Session);
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parent->client = client_session.get();
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parent->server = server_session.get();
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parent->port = std::move(port);
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client_session->parent = parent;
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server_session->parent = parent;
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return std::make_tuple(std::move(server_session), std::move(client_session));
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}
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} // namespace Kernel
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